Electric drive system cooling structure and electric drive system

Abstract

The utility model relates to an electric drive system cooling structure and an electric drive system, and the electric drive system cooling structure comprises an oil distribution plate which comprises an oil inlet, a shaft system oil supply port, a first motor oil supply port and a second motor oil supply port; the pump assembly is used for pumping cooling oil into the oil distribution plate oil duct from the oil inlet; the first shell oil duct is communicated with the first motor oil supply port, and the first shell oil duct is used for cooling the first motor assembly; the second shell oil duct is communicated with the second motor oil supply port, and the second shell oil duct is used for cooling the second motor assembly; and the third shell oil duct communicates with the shafting oil supply port, and the shafting oil supply port is used for cooling the shafting assembly. The cooling effect is achieved through the cooling structure without depending on effectiveness and sensitivity of components such as an electromagnetic valve, and then the cooling structure has the advantages of being stable and reliable.

Description

Technical Field

[0001] The present application relates to the technical field of electric drive systems, and in particular to an electric drive system cooling structure and an electric drive system. Background Art

[0002] The electric drive system of a new energy vehicle may include a first motor, a second motor and a gearbox, wherein the first motor, the second motor and the gearbox may be integrated based on the requirements of compact structure and high space utilization, and the housing of the first motor, the housing of the second motor and the housing of the gearbox may be integrally formed as an integrated housing, and the motor shaft of the first motor and the motor shaft of the second motor may be arranged in parallel, so that the sealing of the integrated housing can be achieved through the front housing and the rear housing. The motor may be set as an oil-cooled motor according to the form of its cooling medium, and the gearbox may also be cooled by cooling oil. Therefore, when the first motor, the second motor and the gearbox are integrated into an electric drive system, an oil-cooled cooling method may still be used. In the prior art, when the electric drive system is cooled by cooling oil, components such as solenoid valves are usually used to distribute the cooling oil to the first motor, the second motor and the gearbox respectively. However, the realization of this function depends entirely on the effectiveness and sensitivity of the solenoid valve when it is working, and the reliability needs to be improved. Utility Model Content

[0003] Based on this, the present application provides an electric drive system cooling structure and an electric drive system to improve the problem in the prior art that the electric drive system relies on a solenoid valve to distribute cooling oil, resulting in low reliability.

[0004] In a first aspect, the present application provides an electric drive system cooling structure, which is used to cool the electric drive system. The electric drive system includes an intermediate housing, a front housing, a rear housing, a first motor assembly, a second motor assembly and a shaft assembly. The intermediate housing is provided with a first motor chamber, a second motor chamber and a shaft chamber. The front housing covers one end of the intermediate housing and seals the first motor chamber and the second motor chamber. The first motor assembly is arranged in the first motor chamber, the second motor assembly is arranged in the second motor chamber, and the shaft assembly is arranged in the shaft chamber. The electric drive system cooling structure includes:

[0005] an oil distribution plate, which is arranged in the shaft system chamber and comprises an oil inlet, a shaft system oil supply port, a first motor oil supply port and a second motor oil supply port, wherein the oil inlet is connected with the shaft system oil supply port, the first motor oil supply port and the second motor oil supply port through an oil distribution plate oil passage;

[0006] A pump assembly, used for pumping cooling oil from the oil inlet into the oil passage of the oil distribution plate;

[0007] A first housing oil passage, which is arranged in the intermediate housing and the rear housing, the first housing oil passage is communicated with the first motor oil supply port, and the first housing oil passage is used to cool the first motor assembly;

[0008] A second housing oil passage, which is arranged in the intermediate housing and the rear housing, the second housing oil passage is communicated with the second motor oil supply port, and the second housing oil passage is used to cool the second motor assembly;

[0009] The third housing oil passage is arranged in the front housing and the intermediate housing. The third housing oil passage is communicated with the shaft system oil supply port, and the shaft system oil supply port is used to cool the shaft system assembly.

[0010] In one embodiment, the pump assembly includes a mechanical pump, which is arranged on the oil distribution plate. The mechanical pump is transmitted to the shaft system assembly. The oil channel of the oil distribution plate includes an upstream oil channel of the mechanical pump and a downstream oil channel of the mechanical pump. The upstream oil channel of the mechanical pump is arranged between the oil inlet and the mechanical pump, and the oil inlet is connected to the shaft system chamber and the upstream oil channel of the mechanical pump. The downstream oil channel of the mechanical pump is arranged downstream of the mechanical pump and is connected to the first motor oil supply port, the second motor oil supply port and the shaft system oil supply port.

[0011] In one embodiment, the pump assembly also includes an electronic pump, which is arranged on the intermediate housing, and the intermediate housing is also provided with an upstream oil passage of the electronic pump and a downstream oil passage of the electronic pump. The oil distribution plate is also provided with an electronic pump inlet and an electronic pump outlet. The oil distribution plate flow channel also includes a confluent oil passage, the downstream oil passage of the mechanical pump is connected to the confluent oil passage, the upstream oil passage of the electronic pump is arranged between the inlet of the electronic pump and the electronic pump, the inlet of the electronic pump is connected to the upstream oil passage of the mechanical pump and the upstream oil passage of the electronic pump, and the downstream oil passage of the electronic pump is provided Between the electronic pump and the electronic pump outlet, the confluent oil passage is arranged between the electronic pump outlet and the first motor oil supply port, between the electronic pump outlet and the second motor oil supply port, and between the electronic pump outlet and the shaft system oil supply port, the electronic pump outlet is connected to the electronic pump downstream oil passage and the confluent oil passage, the first motor oil supply port is connected to the confluent oil passage and the first housing oil passage, the second motor oil supply port is connected to the confluent oil passage and the second housing oil passage, and the shaft system oil supply port is connected to the confluent oil passage and the third housing oil passage.

[0012] In one embodiment, the electric drive system cooling structure also includes an oil cooler, an oil cooling inlet channel and an oil cooling outlet channel are provided on the intermediate housing, the oil distribution plate also includes an oil cooler inlet and an oil cooler outlet, the confluent oil passage includes a confluent upstream oil passage and a confluent downstream oil passage, the mechanical pump downstream oil passage and the electronic pump downstream oil passage are both connected to the confluent upstream oil passage, the first housing oil passage, the second housing oil passage and the third housing oil passage are connected to the confluent downstream oil passage, the oil cooling inlet channel is arranged between the oil cooler inlet and the oil cooler, the oil cooler inlet is connected to the confluent upstream oil passage and the oil cooling inlet channel, the oil cooling outlet channel is arranged between the oil cooler and the oil cooler outlet, and the oil cooler outlet is connected to the oil cooling outlet channel and the confluent downstream oil passage.

[0013] In one embodiment, the first housing oil passage includes a first intermediate housing oil passage and a first rear housing oil passage, the first intermediate housing oil passage is arranged in the intermediate housing, the first rear housing oil passage is arranged in the rear housing and is connected to the first intermediate housing oil passage, the first motor assembly includes a first rotor and a first stator, the electric drive system cooling structure also includes a first rotor main oil passage and a first spray assembly, the first rotor main oil passage is arranged in the first rotor, the first spray assembly is arranged on the top of the first stator, and the first rotor main oil passage and the first spray assembly are both connected to the first rear housing oil passage.

[0014] In one embodiment, the second housing oil passage includes a second intermediate housing oil passage and a second rear housing oil passage, the second intermediate housing oil passage is arranged in the intermediate housing, the second rear housing oil passage is arranged in the rear housing and is connected to the second intermediate housing oil passage, the second motor assembly includes a second rotor and a second stator, the electric drive system cooling structure also includes a second rotor main oil passage and a second spray assembly, the second rotor main oil passage is arranged in the second rotor, the second spray assembly is arranged on the top of the second stator, and the second rotor main oil passage and the second spray assembly are both connected to the second rear housing oil passage.

[0015] In one embodiment, the third housing oil passage includes a front housing oil passage, the front housing oil passage is arranged in the front housing, the shaft system assembly includes a first gear shaft, a second gear shaft, an intermediate shaft and a differential, the first gear shaft is driven by the first motor assembly, the second gear shaft is driven by the second motor assembly, the intermediate shaft is driven by the second gear shaft, the differential is driven by the intermediate shaft, and the electric drive system cooling structure also includes a first gear shaft main oil passage, a second gear shaft main oil passage and an intermediate shaft main oil passage, the first gear shaft main oil passage is arranged in the first gear shaft, and the second gear shaft main oil passage is arranged in The intermediate shaft main oil passage is arranged in the second gear shaft, the shaft system oil supply port includes a first shaft system oil supply port, the front housing is further provided with a first oil distribution chamber, a second oil distribution chamber and a third oil distribution chamber, the front housing oil passage is arranged between the first shaft system oil supply port and the first oil distribution chamber, between the first shaft system oil supply port and the second oil distribution chamber, and between the first shaft system oil supply port and the third oil distribution chamber, the first oil distribution chamber is communicated with the first gear shaft main oil passage, the second oil distribution chamber is communicated with the second gear shaft oil passage, and the third oil distribution chamber is communicated with the intermediate shaft main oil passage.

[0016] In one embodiment, the third housing oil passage also includes a third intermediate housing oil passage, and the third intermediate housing oil passage is arranged in the intermediate housing. The shaft system assembly also includes a drive shaft, and the drive shaft is transmitted to the first gear shaft. The electric drive system cooling structure also includes a drive shaft main oil passage, and the drive shaft main oil passage is arranged in the drive shaft. The shaft system oil supply port also includes a second shaft system oil supply port. A fourth oil distribution chamber is also arranged on the intermediate housing. The third intermediate housing oil passage is arranged between the second shaft system oil supply port and the fourth oil distribution chamber, and the fourth oil distribution chamber is connected to the drive shaft main oil passage.

[0017] In one embodiment, the electric drive system cooling structure also includes an oil filter, which is connected to the oil distribution plate. The oil filter includes an oil filter inlet, an oil filter outlet and a filter element. The filter element is arranged between the oil filter inlet and the oil filter outlet. The oil filter outlet is connected to the oil inlet, and the oil inlet is connected to the shaft system chamber.

[0018] In a second aspect, the present application provides an electric drive system, which includes any one of the electric drive system cooling structures provided in the present application.

[0019] The present application sets an oil distribution plate, and reasonably sets the oil inlet and the oil supply ports at different positions on the oil distribution plate, and cooperates with different housing oil passages set on the front housing, the middle housing and the rear housing, so as to realize the cooling of the first motor part, the second motor part and the gearbox part of the electric drive system respectively. The cooling structure achieves its cooling effect without relying on the effectiveness and sensitivity of components such as solenoid valves, and thus has the characteristics of stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A front view of the cooling structure of the electric drive system provided in Example 1 of the present application;

[0021] Figure 2 A schematic structural diagram of an intermediate housing of the electric drive system cooling structure provided in the first embodiment of the present application, close to one end of the rear housing;

[0022] Figure 3 A schematic structural diagram of an intermediate housing of an electric drive system cooling structure provided in Embodiment 1 of the present application, close to one end of the front housing;

[0023] Figure 4 A path diagram of cooling oil of the cooling structure of the electric drive system provided in Example 1 of the present application;

[0024] Figure 5 A schematic diagram of the structure of the shaft system assembly and the oil distribution plate of the electric drive system cooling structure provided in the first embodiment of the present application, close to one end of the front housing;

[0025] Figure 6 An exploded view of the shaft system assembly and the oil distribution plate of the electric drive system cooling structure provided in the first embodiment of the present application, close to one end of the rear housing;

[0026] Figure 7 Another perspective of the cooling oil path diagram of the electric drive system cooling structure provided in the first embodiment of the present application;

[0027] Figure 8 A first cross-sectional view of the oil distribution plate of the electric drive system cooling structure provided in the first embodiment of the present application;

[0028] Fig. 9 A second cross-sectional view of the oil distribution plate of the electric drive system cooling structure provided in the first embodiment of the present application;

[0029] Fig.10 A cross-sectional view of the electric drive system cooling structure provided in Embodiment 1 of the present application at the oil cooler;

[0030] Fig.11 A third cross-sectional view of the oil distribution plate of the electric drive system cooling structure provided in the first embodiment of the present application;

[0031] Fig.12A schematic structural diagram of a rear housing of an electric drive system cooling structure provided in Embodiment 1 of the present application;

[0032] Fig.13 A schematic diagram of the structure in which the first spray assembly and the second spray assembly of the electric drive system cooling structure provided in the first embodiment of the present application are arranged on the rear housing;

[0033] Fig.14 A schematic structural diagram of the front shell of the electric drive system cooling structure provided in Example 1 of the present application.

[0034] Reference numerals: 100, oil distribution plate; 110, oil inlet; 120, shaft system oil supply port; 121, first shaft system oil supply port; 122, second shaft system oil supply port; 130, first motor oil supply port; 140, second motor oil supply port; 150, oil distribution upper plate; 160, oil distribution lower plate; 170, confluent oil passage; 171, confluent upstream oil passage; 172, confluent downstream oil passage; 181, electronic pump inlet; 182, electronic pump outlet; 191, oil cooler inlet; 192, oil cooler outlet; 200, distribution Oil plate oil passage; 210, mechanical pump upstream oil passage; 220, mechanical pump downstream oil passage; 300, pump assembly; 310, mechanical pump; 320, electronic pump; 400, intermediate housing; 410, first motor chamber; 420, second motor chamber; 430, shaft system chamber; 440, electronic pump upstream oil passage; 450, electronic pump downstream oil passage; 460, oil cooling inlet passage; 470, oil cooling outlet passage; 480, first intermediate housing oil passage; 490, second intermediate housing oil passage; 4010, third intermediate housing oil passage; 402, fourth oil distribution chamber; 500, front housing; 510, front housing oil passage; 520, first oil distribution chamber; 530, second oil distribution chamber; 540, third oil distribution chamber; 600, rear housing; 610, first rear housing oil passage; 620, second rear housing oil passage; 700, first motor assembly; 710, first rotor; 711, first rotor main oil passage; 720, first stator; 721, first spray assembly; 800, second motor assembly; 810, second rotor; 811, second rotor 820, second stator; 821, second spray assembly; 900, shaft assembly; 910, first gear shaft; 911, first gear shaft main oil passage; 920, second gear shaft; 921, second gear shaft main oil passage; 930, intermediate shaft; 931, intermediate shaft main oil passage; 940, differential; 950, drive shaft; 951, drive shaft main oil passage; 101, oil cooler; 102, oil filling tray; 103, oil filter; 104, oil filter inlet; 105, oil filter outlet; 106, filter element. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0037] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0038] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0039] Embodiment 1

[0040] Embodiment 1 of the present application provides a cooling structure for an electric drive system, such as Figures 1 to 14 As shown, the electric drive system cooling structure is used to cool the electric drive system. The electric drive system includes an intermediate housing 400, a front housing 500, a rear housing 600, a first motor assembly 700, a second motor assembly 800 and a shaft assembly 900. The intermediate housing 400 is provided with a first motor chamber 410, a second motor chamber 420 and a shaft chamber 430. The front housing 500 covers one end of the intermediate housing 400 and closes the first motor chamber 410 and the second motor chamber 420. The first motor assembly 700 is arranged in the first motor chamber 410, the second motor assembly 800 is arranged in the second motor chamber 420, and the shaft assembly 900 is arranged in the shaft chamber 430. The electric drive system cooling structure includes:

[0041] The oil distribution plate 100 is disposed in the shaft system chamber 430 and includes an oil inlet 110, a shaft system oil supply port 120, a first motor oil supply port 130 and a second motor oil supply port 140. The oil inlet 110 is connected to the shaft system oil supply port 120, the first motor oil supply port 130 and the second motor oil supply port 140 through an oil distribution plate oil passage 200;

[0042] A pump assembly 300, which is used to pump cooling oil from the oil inlet 110 into the oil channel 200 of the oil distribution plate;

[0043] A first housing oil passage, which is disposed in the intermediate housing 400 and the rear housing 600, the first housing oil passage being in communication with the first motor oil supply port 130, and the first housing oil passage being used to cool the first motor assembly 700;

[0044] A second housing oil passage, which is disposed in the intermediate housing 400 and the rear housing 600, the second housing oil passage is communicated with the second motor oil supply port 140, and the second housing oil passage is used to cool the second motor assembly 800;

[0045] The third housing oil passage is disposed in the front housing 500 and the intermediate housing 400 . The third housing oil passage is communicated with the shaft system oil supply port 120 . The shaft system oil supply port 120 is used to cool the shaft system assembly 900 .

[0046] like Figure 1 As shown, in this embodiment, it is exemplarily explained that the electric drive system may include a first motor part, a second motor part and a gearbox part. The first motor part, the second motor part and the gearbox part may be integrated, for example, the housing of the first motor part, the housing of the second motor part and the housing of the gearbox part are integrated into an intermediate housing 400, the front end cover of the first motor part, the front end cover of the second motor part and the end cover of the gearbox part are integrated into a front housing 500, and the rear end cover of the first motor part and the rear end cover of the second motor part are integrated into a rear housing 600.

[0047] like Figures 1 to 3 As shown, the intermediate housing 400 may be provided with a first motor chamber 410, a second motor chamber 420 and a shafting chamber 430. The first motor chamber 410 and the second motor chamber 420 may be provided close to the rear housing 600, and their opening directions may be set to be the same, and may be closed by the rear housing 600. The rear housing 600 and the intermediate housing 400 may be detachably connected by bolts and other components, and the connection is kept sealed. The shafting chamber 430 may be provided close to the front housing 500, and its opening direction may be opposite to the first motor chamber 410 and the second motor chamber 420, and may be closed by the front housing 500. Similarly, the front housing 500 and the intermediate housing 400 may be connected by bolts and other components, and the connection is kept sealed.

[0048] like Figures 2 to 5 As shown, the first motor assembly 700 and the second motor assembly 800 can be arranged in the first motor chamber 410 and the second motor chamber 420, respectively, to form the first motor part and the second motor part, respectively. The shaft system assembly 900 can be arranged in the shaft system chamber 430 to form the gearbox part. The shaft system of the first motor assembly 700 and the second motor assembly 800 can be arranged horizontally, that is, to form a horizontally arranged electric drive system. At this time, the first motor chamber 410 and the second motor chamber 420 can both be connected to the shaft system chamber 430, and the connection point can be set at the bottom of the first motor chamber 410 and the second motor chamber 420.

[0049] like Figure 2 and Figure 3 As shown, cooling oil may be provided in the first motor chamber 410, the second motor chamber 420 and the shafting chamber 430, and the cooling oil may be located at the bottom of the first motor chamber 410, the second motor chamber 420 and the shafting chamber 430 under the action of its own weight. The first motor assembly 700, the second motor assembly 800 and the shafting assembly 900 may be partially immersed in the cooling oil so as to be directly cooled by the cooling oil. At the same time, the first motor assembly 700, the second motor assembly 800 and the shafting assembly 900 are also cooled by the electric drive system cooling structure.

[0050] like Figures 4 to 6 As shown, the oil distribution plate 100 can be arranged in the shaft system chamber 430, and it can be detachably connected to the intermediate housing 400 by bolts and other components. The oil distribution plate 100 is mainly used to distribute cooling oil so as to cool the first motor assembly 700, the second motor assembly 800 and the shaft system assembly 900 respectively. The oil distribution plate 100 is provided with an oil inlet 110 for cooling oil to enter, and a first motor oil supply port 130, a second motor oil supply port 140 and a shaft system oil supply port 120 for cooling oil to be discharged and discharged to different positions. The oil distribution plate 100 can also be provided with an oil distribution plate oil passage 200, and the oil inlet 110 is connected with the first motor oil supply port 130, the second motor oil supply port 140 and the shaft system oil supply port 120 through the oil distribution plate oil passage 200. Driven by the pump assembly 300 , the cooling oil can enter the oil distribution plate oil passage 200 from the oil inlet 110 , and then be discharged from the first motor oil supply port 130 , the second motor oil supply port 140 and the shaft system oil supply port 120 , respectively.

[0051] like Figure 4 , Figure 6 and Figure 7As shown, in this embodiment, when the cooling oil is discharged from the first motor oil supply port 130, it can be discharged to the first housing oil passage connected to the first motor oil supply port 130. The first housing oil passage can extend in the intermediate housing 400 and the rear housing 600 and extend to the first motor assembly 700, so that the cooling oil can cool the first motor assembly 700. Similarly, when the cooling oil is discharged from the second motor oil supply port 140, it can be discharged to the second housing oil passage connected to the second motor oil supply port 140. The second housing oil passage also extends in the intermediate housing 400 and the rear housing 600 and extends to the second motor, so that the cooling oil can cool the second motor assembly 800. The third housing oil passage is connected to the shafting oil supply port 120, which is extended in the intermediate housing 400 and the front housing 500 and extends to the shafting component. When the cooling oil is discharged from the shafting oil supply port 120, it can cool the shafting assembly 900 through the third housing oil passage.

[0052] In summary, the present application sets an oil distribution plate 100, and reasonably sets an oil inlet 110 and oil supply ports at different positions on the oil distribution plate 100, and cooperates with different housing oil passages set on the front housing 500, the middle housing 400 and the rear housing 600, so as to realize the cooling of the first motor part, the second motor part and the gearbox part of the electric drive system respectively. The cooling structure achieves its cooling effect without relying on the effectiveness and sensitivity of components such as solenoid valves, and thus has the characteristics of stability and reliability.

[0053] Specifically, the pump assembly 300 includes a mechanical pump 310, which is arranged on the oil distribution plate 100. The mechanical pump 310 is transmitted to the shaft system assembly 900. The oil distribution plate oil channel 200 includes a mechanical pump upstream oil channel 210 and a mechanical pump downstream oil channel 220. The mechanical pump upstream oil channel 210 is arranged between the oil inlet 110 and the mechanical pump 310. The oil inlet 110 is connected to the shaft system chamber 430 and the mechanical pump upstream oil channel 210. The mechanical pump downstream oil channel 220 is arranged downstream of the mechanical pump 310 and is connected to the first motor oil supply port 130, the second motor oil supply port 140 and the shaft system oil supply port 120.

[0054] like Figure 5 and Figure 6 As shown, in this embodiment, the oil distribution plate 100 can include an upper oil distribution plate 150 and a lower oil distribution plate 160, and the upper oil distribution plate 150 and the lower oil distribution plate 160 can be stacked. The oil inlet 110 can be set on the side of the lower oil distribution plate 160, and can be spaced from the inner wall of the shaft system chamber 430.

[0055] like Figure 4 and Figure 8As shown, the upstream oil passage 210 of the mechanical pump in the oil passage 200 of the oil distribution plate can be partially arranged in the lower oil distribution plate 160 and partially arranged in the upper oil distribution plate 150, and its extension path runs through the upper oil distribution plate 150 and the lower oil distribution plate 160. The mechanical pump 310 can be a gear pump, and its pump shaft can be driven by the shaft system assembly 900 through a transmission gear. When the shaft system assembly 900 is working, it can drive the transmission gear to rotate to achieve the purpose of driving the mechanical pump 310 to work. The mechanical pump 310 can be arranged in the lower oil distribution plate 160, and the lower oil distribution plate 160 can be provided with a chamber for arranging the mechanical pump 310, and the chamber can be communicated with the part of the upstream oil passage 210 of the mechanical pump located in the upper oil distribution plate 150.

[0056] like Figure 4 and Figure 8 As shown, the mechanical pump downstream oil passage 220 can also be partially arranged in the oil distribution upper plate 150 and partially arranged in the oil distribution lower plate 160, that is, its extension path passes through the oil distribution upper plate 150 and the oil distribution lower plate 160. The chamber where the mechanical pump 310 is arranged is also connected to the part of the mechanical pump downstream oil passage 220 located in the oil distribution upper plate 150. Since the mechanical pump 310 is arranged between the mechanical pump upstream oil passage 210 and the mechanical pump downstream oil passage 220, and the mechanical pump upstream oil passage 210 is connected to the oil inlet 110, when the mechanical pump 310 is working, the cooling oil can be pumped from the oil inlet 110 to the mechanical pump upstream oil passage 210, the mechanical pump 310, and the mechanical pump downstream oil passage 220 in sequence.

[0057] like Figure 6 and Figure 7 As shown, the positions of the first motor oil supply port 130, the second motor oil supply port 140 and the shaft system oil supply port 120 on the oil distribution plate 100 can be set according to actual needs, but no matter where they are set, it is necessary to ensure that the first motor oil supply port 130, the second motor oil supply port 140 and the shaft system oil supply port 120 are connected to the downstream oil channel 220 of the mechanical pump, so that the cooling oil pumped into the downstream oil channel 220 of the mechanical pump via the mechanical pump 310 can be further discharged from the first motor oil supply port 130, the second motor oil supply port 140 and the shaft system oil supply port 120.

[0058] It can be understood that, in this embodiment, by providing a mechanical pump 310 and by reasonably setting the composition structure and connectivity of the oil channel of the mechanical pump 310, the cooling oil can be pumped into the cooling structure of the electric drive system through the mechanical pump 310, while stably and reliably distributing the cooling oil among the first motor part, the second motor part and the gearbox part.

[0059] More specifically, the pump assembly 300 also includes an electronic pump 320, which is disposed on the intermediate housing 400. The intermediate housing 400 is also provided with an electronic pump upstream oil passage 440 and an electronic pump downstream oil passage 450. The oil distribution plate 100 is also provided with an electronic pump inlet 181 and an electronic pump outlet 182. The flow passage of the oil distribution plate 100 also includes a confluent oil passage 170. The mechanical pump downstream oil passage 220 is connected to the confluent oil passage 170. The electronic pump upstream oil passage 440 is disposed between the electronic pump inlet 181 and the electronic pump 320. The electronic pump inlet 181 is connected to the mechanical pump upstream oil passage 210 and the electronic pump upstream oil passage 440. The downstream oil passage 450 is arranged between the electronic pump 320 and the electronic pump outlet 182, the confluent oil passage 170 is arranged between the electronic pump outlet 182 and the first motor oil supply port 130, between the electronic pump outlet 182 and the second motor oil supply port 140, and between the electronic pump outlet 182 and the shaft system oil supply port 120, the electronic pump outlet 182 connects the electronic pump downstream oil passage 450 and the confluent oil passage 170, the first motor oil supply port 130 connects the confluent oil passage 170 and the first housing oil passage, the second motor oil supply port 140 connects the confluent oil passage 170 and the second housing oil passage, and the shaft system oil supply port 120 connects the confluent oil passage 170 and the third housing oil passage.

[0060] like Figure 2 and Figure 3 As shown, in this embodiment, it is exemplarily explained that an electronic pump 320 may also be provided in the first motor chamber 410, and a mounting position for installing the electronic pump 320 may be provided on the intermediate housing 400. The electronic pump 320 is used to receive relevant control instructions, which include at least two states: working and non-working. An electronic pump upstream oil passage 440 is also provided on the intermediate housing 400, and the electronic pump upstream oil passage 440 is connected to the electronic pump 320, and the electronic pump 320 can be arranged close to the oil distribution lower plate 160.

[0061] like Figure 3 , Figure 4 , Figure 6 and Figure 8 As shown, the oil distribution lower plate 160 may be provided with an electronic pump inlet 181, and the electronic pump inlet 181 may connect the electronic pump upstream oil passage 440 with the part of the mechanical pump upstream oil passage 210 located on the oil distribution lower plate 160. When the electronic pump 320 is working, the cooling oil may enter the mechanical pump upstream oil passage 210 from the oil inlet 110, and then enter the electronic pump 320 from the electronic pump inlet 181. The intermediate housing 400 may also be provided with an electronic pump downstream oil passage 450, and the oil distribution lower plate 160 may also be provided with an electronic pump outlet 182, and the electronic pump downstream oil passage 450 is arranged between the electronic pump 320 and the electronic pump outlet 182.

[0062] like Figure 4 , Figure 8 and Fig. 9 As shown, the oil distribution plate 100 may also be provided with a confluent oil passage 170, and the electronic pump outlet 182 communicates with the electronic pump downstream oil passage 450 and the confluent oil passage 170. The cooling oil pumped into the electronic pump 320 may further enter the electronic pump downstream oil passage 450, and be pumped into the confluent oil passage 170 via the electronic pump outlet 182. At the same time, the mechanical pump downstream oil passage 220 is communicated with the confluent oil passage 170. When the mechanical pump 310 is working and pumps the cooling oil to the mechanical pump downstream oil passage 220, the cooling oil may be confluent with the cooling oil pumped into the mechanical pump 320 via the confluent oil passage 170. The extension path of the confluent oil passage 170 on the oil distribution plate 100 may be set according to actual needs, and may be set between the electronic pump outlet 182 and the first motor oil supply port 130, between the electronic pump outlet 182 and the second motor oil supply port 140, and between the electronic pump outlet 182 and the shaft system oil supply port 120. When the electronic pump 320 is working, the cooling oil in the combined oil passage 170 can be pumped from the first motor oil supply port 130 to the first housing oil passage, from the second motor oil supply port 140 to the second housing oil passage, and from the shaft system oil supply port 120 to the third housing oil passage.

[0063] It is understandable that, by providing the electronic pump 320 and by reasonably providing the composition structure and the connection relationship of the oil channel of the electronic pump 320, the cooling oil can be pumped into the cooling structure of the electric drive system through the electronic pump 320; and by the mutual cooperation between the electronic pump 320 and the mechanical pump 310, the cooling structure of the electric drive system can be adapted to different working conditions of the electric drive system, for example, under the idling condition, the mechanical pump 310 may not work, and only the electronic pump 320 may work; for another example, under the high-speed condition, both the mechanical pump 310 and the electronic pump 320 may work. Therefore, according to the foregoing, the functionality of the cooling structure of the electric drive system is improved in this embodiment.

[0064] More specifically, the cooling structure of the electric drive system also includes an oil cooler 101, an oil cooling inlet channel 460 and an oil cooling outlet channel 470 are provided on the intermediate housing 400, the oil distribution plate 100 also includes an oil cooler inlet 191 and an oil cooler outlet 192, the confluent oil passage 170 includes a confluent upstream oil passage 171 and a confluent downstream oil passage 172, the mechanical pump downstream oil passage 220 and the electronic pump downstream oil passage 450 are both connected to the confluent upstream oil passage 171, the first housing oil passage, the second housing oil passage and the third housing oil passage are connected to the confluent downstream oil passage 172, the oil cooling inlet channel 460 is arranged between the oil cooler inlet 191 and the oil cooler 101, the oil cooler inlet 191 is connected to the confluent upstream oil passage 171 and the oil cooling inlet channel 460, the oil cooling outlet channel 470 is arranged between the oil cooler 101 and the oil cooler outlet 192, and the oil cooler outlet 192 is connected to the oil cooling outlet channel 470 and the confluent downstream oil passage 172.

[0065] like Figure 7 and Fig.10 As shown, in this embodiment, the oil cooler 101 can be fixed to the intermediate housing 400 by bolts and other components, and the oil cooler 101 is arranged on the outer side of the intermediate housing 400. The oil cooler 101 is used to cool the cooling oil. When the cooling oil enters the oil cooler 101, it can exchange heat with the refrigerant, and the refrigerant can be cooling water. The intermediate housing 400 is provided with an oil cooling inlet channel 460 for the cooling oil to enter the oil cooler 101 and an oil cooling outlet channel 470 for the cooling oil to be discharged from the oil cooler 101.

[0066] like Figure 6 , Fig. 9 and Fig.10 As shown, the oil distribution lower plate 160 may also be provided with an oil cooler inlet 191 and an oil cooler outlet 192, wherein the oil cooler inlet channel 460 may be provided between the oil cooler inlet 191 and the oil cooler 101, and the oil cooler inlet 191 may connect the confluent upstream oil passage 171 with the oil cooler inlet channel 460; since the confluent upstream oil passage 171 is connected with both the mechanical pump downstream oil passage 220 and the electronic pump downstream oil passage 450, when the cooling oil is pumped into the confluent upstream oil passage 171 via the mechanical pump 310 and / or the electronic pump 320, the cooling oil may enter the oil cooler inlet channel 460 and the oil cooler 101 in sequence from the oil cooler inlet 191. The oil cooler outlet channel 470 may be provided between the oil cooler 101 and the oil cooler outlet 192, and the oil cooler outlet 192 may connect the oil cooler outlet channel 470 and the confluent downstream oil passage 172. Since the confluent downstream oil passage 172 is connected to the first shell oil passage, the second shell oil passage and the third shell oil passage, the cooling oil after entering the oil cooler 101 can enter the oil cooling outlet channel 470, the confluent downstream oil passage 172 and the first shell oil passage, the second shell oil passage and the third shell oil passage in sequence.

[0067] It can be understood that, by providing the oil cooler 101 and reasonably arranging the composition structure and connectivity of the oil channel of the oil cooler 101, the cooling oil entering the first shell oil channel, the second shell oil channel and the third shell oil channel can be cooled down through the oil cooler 101, thereby ensuring the cooling effect on the first motor assembly 700, the second electronic assembly and the shaft system assembly 900.

[0068] like Figure 4 , Figure 8 and Fig. 9As shown, in detail, the confluent upstream oil passage 171 can be partially arranged in the oil distribution lower plate 160, and the part of the confluent upstream oil passage 171 can be connected to the mechanical pump downstream oil passage 220, and a pressure ball valve can be arranged at the connection point, and the pressure ball valve can be opened under the oil pressure of the cooling oil, so that the confluent upstream oil passage 171 is connected to the oil passage of the mechanical pump 310. The confluent upstream oil passage 171 can also be partially arranged in the oil distribution upper plate 150, and the part of the confluent upstream oil passage 171 can be penetrated from the part of the confluent upstream oil passage 171 located in the oil distribution lower plate 160 to the oil distribution upper plate 150, and then extend in the direction close to the electronic pump outlet 182, and then penetrate and extend to the position of the electronic pump outlet 182. Similarly, a pressure ball valve can also be arranged in the confluent front and rear passages located in the oil distribution upper plate 150 to control the connection between the confluent upstream oil passage 171 and the electronic pump downstream oil passage 450.

[0069] Specifically, the first housing oil passage includes a first intermediate housing oil passage 480 and a first rear housing oil passage 610. The first intermediate housing oil passage 480 is arranged in the intermediate housing 400. The first rear housing oil passage 610 is arranged in the rear housing 600 and is connected to the first intermediate housing oil passage 480. The first motor assembly 700 includes a first rotor 710 and a first stator 720. The electric drive system cooling structure also includes a first rotor main oil passage 711 and a first spray assembly 721. The first rotor main oil passage 711 is arranged in the first rotor 710. The first spray assembly 721 is arranged at the top of the first stator 720. The first rotor main oil passage 711 and the first spray assembly 721 are both connected to the first rear housing oil passage 610.

[0070] like Figure 6 , Fig. 9 Hehe Fig.11 As shown, in this embodiment, the first motor oil supply port 130 can be set on the oil distribution lower plate 160 to communicate with the first intermediate housing oil passage 480. The confluent downstream oil passage 172 can pass through the oil cooler outlet 192 to the oil distribution upper plate 150, then extend in the direction close to the first motor oil supply port 130, and then pass through to the position of the first motor oil supply port 130.

[0071] like Figure 2 , Figure 7 and Fig.12 As shown, the first intermediate housing oil passage 480 may be disposed at the bottom of the intermediate housing 400 and may be disposed along the axial direction of the first motor assembly 700. The first rear housing oil passage 610 is communicated with the first intermediate housing oil passage 480 and may extend from a position close to the first intermediate housing oil passage 480 to a position close to the first rotor 710 and the first spray assembly 721 in sequence.

[0072] like Figure 7As shown, in the first rotor 710, an axial first rotor main oil passage 711 is provided, and the first rotor main oil passage 711 is connected to the first rear housing oil passage 610. When the cooling oil enters the first intermediate housing oil passage 480 and the first rear housing oil passage 610 in sequence through the first motor oil supply port 130, the cooling oil can enter the first rotor main oil passage 711 to cool the first rotor 710. Other cooling structures can also be provided on the first rotor 710, such as an iron core oil passage provided on the iron core of the first rotor 710, an oil-slinging hole provided on the end plate of the first rotor 710, etc. The iron core oil passage can communicate with the first rotor main oil passage 711 and the oil-slinging hole, and the cooling oil slinging out of the oil-slinging hole can return to the first motor chamber 410 to realize the circulation of the cooling oil in the first rotor 710.

[0073] like Figure 7 and Fig.13 As shown, since there is a certain amount of cooling oil in the first motor chamber 410, the bottom of the first stator 720 is directly immersed in the cooling oil for cooling. The top of the first stator 720 can be cooled by the first spray assembly 721, which can be plugged into the rear housing 600 and arranged on the top of the first stator 720. The first spray assembly 721 can include a plurality of spray pipes arranged along the axial direction of the first motor assembly 700, and the spray pipes can be connected through arc-shaped pipes, and the spray pipes can be evenly distributed with spray holes. Since the first spray assembly 721 is connected to the first rear housing oil passage 610, the cooling oil entering the first housing oil passage can also cool the top of the first stator 720 through the first spray assembly 721 to ensure the cooling effect of the first stator 720.

[0074] It can be understood that this embodiment can ensure the cooling effect of the cooling oil on the first motor assembly 700 by reasonably setting the composition and connectivity of the first housing oil channel, as well as reasonably setting the composition and connectivity of the electric drive system cooling structure at the position of the first motor assembly 700.

[0075] Specifically, the second housing oil passage includes a second intermediate housing oil passage 490 and a second rear housing oil passage 620. The second intermediate housing oil passage 490 is arranged in the intermediate housing 400. The second rear housing oil passage 620 is arranged in the rear housing 600 and is connected to the second intermediate housing oil passage 490. The second motor assembly 800 includes a second rotor 810 and a second stator 820. The electric drive system cooling structure also includes a second rotor main oil passage 811 and a second spray assembly 821. The second rotor main oil passage 811 is arranged in the second rotor 810. The second spray assembly 821 is arranged on the top of the second stator 820. The second rotor main oil passage 811 and the second spray assembly 821 are both connected to the second rear housing oil passage 620.

[0076] like Figure 2, Figure 6 and Figure 7 As shown, in this embodiment, for illustrative purposes, the second motor oil supply port 140 may also be disposed on the oil distribution lower plate 160 so as to communicate with the second intermediate housing oil passage 490 .

[0077] like Fig. 9 and Fig.11 As shown, similarly, the confluent downstream oil passage 172 may pass through the oil cooler outlet 192 to the oil distribution upper plate 150 , then extend toward the second motor oil supply port 140 , and then pass through to the position of the second motor oil supply port 140 .

[0078] like Figure 2 , Figure 7 and Fig.12 As shown, the second intermediate housing oil passage 490 can also be arranged at the bottom of the intermediate housing 400, and it can be arranged in parallel with the first intermediate housing oil passage 480. The second rear housing oil passage 620 is connected to the second intermediate housing oil passage 490, and it can extend from a position close to the second intermediate housing oil passage 490 to a position close to the second rotor 810 and the second spray assembly 821 in sequence.

[0079] like Figure 7 As shown, similarly, the second rotor 810 is provided with a second rotor main oil passage 811 along its axial direction, and the second rotor main oil passage 811 is communicated with the second rear housing oil passage 620. When the cooling oil enters the second intermediate housing oil passage 490 and the second rear housing oil passage 620 in sequence through the second motor oil supply port 140, the cooling oil can enter the second rotor main oil passage 811 to cool the first rotor 710. Other cooling structures can also be provided on the second rotor 810 to realize the circulation of the cooling oil in the second rotor 810.

[0080] like Figure 7 and Fig.13 As shown, similarly, a certain amount of cooling oil is contained in the second motor chamber 420, and this part of cooling oil can cool the bottom of the second stator 820 under the action of its own weight, while the second spray assembly 821 cools the top of the second stator 820. The second spray assembly 821 can also be plugged into the rear housing 600 and arranged on the top of the second stator 820. The structure of the second spray assembly 821 is similar to that of the first spray assembly 721, and the number and specific position of its spray pipes can be arranged according to actual needs. Since the second spray assembly 821 is connected to the second rear housing oil passage 620, the cooling oil entering the second housing oil passage can also cool the top of the second stator 820 through the second spray assembly 821 to ensure the cooling effect on the second stator 820.

[0081] It can be understood that this embodiment can ensure the cooling effect of the cooling oil on the second motor assembly 800 by reasonably setting the composition and connectivity of the second housing oil channel, as well as reasonably setting the composition and connectivity of the electric drive system cooling structure at the position of the second motor assembly 800.

[0082] Specifically, the third housing oil passage includes a front housing oil passage 510, which is disposed in the front housing 500. The shaft system assembly 900 includes a first gear shaft 910, a second gear shaft 920, an intermediate shaft 930 and a differential 940. The first gear shaft 910 is transmitted to the first motor assembly 700, the second gear shaft 920 is transmitted to the second motor assembly 800, the intermediate shaft 930 is transmitted to the second gear shaft 920, and the differential 940 is transmitted to the intermediate shaft 930. The electric drive system cooling structure also includes a first gear shaft main oil passage 911, a second gear shaft main oil passage 921 and an intermediate shaft main oil passage 931. The first gear shaft main oil passage 911 is disposed in the first gear shaft 910, and the second gear shaft main oil passage 921 is disposed in the first gear shaft Inside the second gear shaft 920, the intermediate shaft main oil passage 931 is arranged inside the intermediate shaft 930, the shaft system oil supply port 120 includes the first shaft system oil supply port 121, and the front housing 500 is also provided with a first oil distribution chamber 520, a second oil distribution chamber 530 and a third oil distribution chamber 540. The front housing oil passage 510 is arranged between the first shaft system oil supply port 121 and the first oil distribution chamber 520, between the first shaft system oil supply port 121 and the second oil distribution chamber 530, and between the first shaft system oil supply port 121 and the third oil distribution chamber 540. The first oil distribution chamber 520 is connected to the first gear shaft main oil passage 911, the second oil distribution chamber 530 is connected to the oil passage of the second gear shaft 920, and the third oil distribution chamber 540 is connected to the intermediate shaft main oil passage 931.

[0083] like Figure 4 and Figure 5 As shown, in this embodiment, the first motor part can be a generator, the second motor part can be a drive motor, and the shaft system assembly 900 can include a first gear shaft 910, a second gear shaft 920, an intermediate shaft 930 and a differential 940, wherein the first gear shaft 910 is driven by the first rotor 710 of the first motor assembly 700 to drive the first motor to work. The second gear shaft 920 is driven by the second rotor 810 of the second motor assembly 800, and the second rotor 810 can drive the second gear shaft 920 to rotate; at the same time, the second gear shaft 920 is also driven by the intermediate shaft 930, and the intermediate shaft 930 is also driven by the differential 940. When the second rotor 810 drives the second gear shaft 920 to rotate, it can also drive the differential 940 to work through the intermediate shaft 930 to achieve the purpose of driving the vehicle. The mechanical pump 310 can be driven by the second motor assembly 800, and its pump shaft can be driven by the differential 940.

[0084] like Figure 7 As shown, the shaft system oil supply port 120 may include a first shaft system oil supply port 121, and the first shaft system oil supply port 121 may be used to cool the first gear shaft 910, the second gear shaft 920 and the intermediate shaft 930; and correspondingly, the first gear shaft 910, the second gear shaft 920 and the intermediate shaft 930 may be respectively provided with a first gear shaft main oil passage 911, a second gear shaft main oil passage 921 and an intermediate shaft main oil passage 931 along their axial direction for cooling oil to enter. It should be noted that the first gear shaft 910, the second gear shaft 920 and the intermediate shaft 930 are also provided with corresponding oil return structures to facilitate the circulation of cooling oil.

[0085] like Fig.14 As shown, at the same time, the front housing 500 may be respectively provided with a first oil distribution chamber 520, a second oil distribution chamber 530 and a third oil distribution chamber 540 which are respectively connected to the first gear shaft main oil passage 911, the second gear shaft main oil passage 921 and the intermediate shaft main oil passage 931, and an oil filling pan 102 may be provided in the first oil distribution chamber 520, the second oil distribution chamber 530 and the third oil distribution chamber 540, and the oil filling pan 102 may be provided with an oil filling nozzle extending into the first gear shaft main oil passage 911, the second gear shaft main oil passage 921 or the intermediate shaft main oil passage 931.

[0086] like Figure 4 and Fig.14 As shown, the front housing 500 is also provided with a front housing oil passage 510, which is arranged between the first shaft system oil supply port 121 and the first oil distribution chamber 520, between the first shaft system oil supply port 121 and the second oil distribution chamber 530, and between the first shaft system oil supply port 121 and the third oil distribution chamber 540; that is, the first shaft system oil supply port 121 is respectively connected with the first oil distribution chamber 520, the second oil distribution chamber 530 and the third oil distribution chamber 540 through the front housing oil passage 510. Since the intermediate shaft 930 is arranged close to the second gear shaft 920, the second oil distribution chamber 530 can be connected with the first oil distribution chamber 520, and then indirectly connected with the front housing oil passage 510.

[0087] like Figure 7 and Fig.11 As shown, in this embodiment, the first shaft system oil supply port 121 can be set on the oil distribution upper plate 150, so as to communicate with the front housing oil passage 510. According to the above, when the confluent downstream oil passage 172 passes through the oil cooler outlet 192 to the oil distribution upper plate 150, and extends in the direction close to the second motor oil supply port 140, and then passes through to the position of the second motor oil supply port 140, the confluent downstream oil passage 172 can also extend in the oil distribution lower plate 160 in the direction close to the first shaft system oil supply port 121, and then pass through to the position of the first shaft system oil supply port 121.

[0088] It can be understood that this embodiment can ensure the cooling effect of the cooling oil on the shaft system assembly 900 by reasonably setting the composition and connectivity of the third housing oil channel, as well as reasonably setting the composition and connectivity of the electric drive system cooling structure at the position of the shaft system assembly 900.

[0089] More specifically, the third housing oil passage also includes a third intermediate housing oil passage 401, which is disposed in the intermediate housing 400. The shaft system assembly 900 also includes a drive shaft 950, which is transmitted to the first gear shaft 910. The electric drive system cooling structure also includes a drive shaft main oil passage 951, which is disposed in the drive shaft 950. The shaft system oil supply port 120 also includes a second shaft system oil supply port 122. A fourth oil distribution chamber 402 is also disposed on the intermediate housing 400. The third intermediate housing oil passage 401 is disposed between the second shaft system oil supply port 122 and the fourth oil distribution chamber 402, and the fourth oil distribution chamber 402 is connected to the drive shaft main oil passage 951.

[0090] like Figure 5 and Figure 6 As shown, in this embodiment, the shaft system assembly 900 can also include a drive shaft 950, which can be driven by the first gear shaft 910 to drive the first motor part as a generator. The drive shaft 950 can be driven by an engine or other device and rotated under the drive of the engine.

[0091] like Figure 3 and Figure 4 As shown, the shaft system oil supply port 120 may further include a second shaft system oil supply port 122, and the second shaft system oil supply port 122 may be used to cool the drive shaft 950; and correspondingly, the drive shaft 950 may be provided with a drive shaft main oil passage 951 along its axial direction for cooling oil to enter. Similarly, the drive shaft 950 may also be provided with an oil return structure connected to the drive shaft main oil passage 951 to facilitate the circulation of cooling oil.

[0092] like Figure 3 and Figure 4 As shown, the front housing 500 may be provided with a fourth oil distribution chamber 402 connected to the main oil passage 951 of the drive shaft, and the fourth oil distribution chamber 402 may also be provided with an oil filling plate 102 for injecting cooling oil into the main oil passage 951 of the drive shaft. The intermediate housing 400 is also provided with a third intermediate housing oil passage 401, which is provided between the second shaft system oil supply port 122 and the fourth oil distribution chamber 402; that is, the second shaft system oil supply port 122 is connected to the fourth oil distribution chamber 402 through the third intermediate housing oil passage 401.

[0093] like Figure 3 , Figure 4 , Figure 6 and Fig.11 As shown, in this embodiment, the second shaft system oil supply port 122 can be set on the oil distribution lower plate 160 so as to communicate with the front housing oil passage 510. According to the above, when the confluent downstream oil passage 172 passes through the oil cooler outlet 192 to the oil distribution upper plate 150, and extends in the direction close to the second motor oil supply port 140, and then passes through to the position of the second motor oil supply port 140, the confluent downstream oil passage 172 can also extend in the oil distribution lower plate 160 in the direction close to the second shaft system oil supply port 122, and then pass through the oil distribution upper plate 150 at the position close to the second shaft system oil supply port 122, and continue to extend in the direction close to the second shaft system oil supply port 122, and finally pass through to the position of the second shaft system oil supply port 122.

[0094] It can be understood that this embodiment can further ensure the cooling effect of the cooling oil on the shaft system assembly 900 by further reasonably setting the composition and connection relationship of the third housing oil channel, and further reasonably setting the composition and connection relationship of the electric drive system cooling structure at the position of the shaft system assembly 900.

[0095] Specifically, the electric drive system cooling structure also includes an oil filter 103, which is connected to the oil distribution plate 100. The oil filter 103 includes an oil filter inlet 104, an oil filter outlet 105 and a filter element 106. The filter element 106 is arranged between the oil filter inlet 104 and the oil filter outlet 105. The oil filter outlet 105 is connected to the oil inlet 110, and the oil inlet 110 is connected to the shaft system chamber 430.

[0096] like Figure 6 and Figure 8 As shown, in this embodiment, the oil filter 103 can be provided with a flat structure, which can be detachably connected to the oil distribution plate 100 by bolts and other components. The oil filter 103 can be provided between the bottom of the oil distribution plate 100 and the inner wall of the shaft system chamber 430, the oil filter outlet 105 and the oil filter inlet 104 can be provided at the upper and lower sides of the flat structure of the oil filter 103, and the filter element 106 can be provided in the middle position of the flat structure of the oil filter 103. The oil filter inlet 104 can be connected to the shaft system chamber 430, and the oil filter outlet 105 can be connected to the oil inlet 110. When the mechanical pump 310 and / or the electronic pump 320 are working, the cooling oil can enter the oil filter 103 from the oil filter inlet 104, and after being filtered by the filter element 106, it is discharged from the oil filter outlet 105, and further enters the upstream oil passage 210 of the mechanical pump through the oil supply port of the oil distribution plate 100.

[0097] It can be understood that, by providing the oil filter 103 in this embodiment and by reasonably setting the composition and connectivity of the oil filter 103, the cooling oil can be filtered through the oil filter 103 before the oil distribution plate 100 distributes the cooling oil, thereby ensuring the cooling effect of the cooling oil in the cooling structure of the electric drive system.

[0098] The implementation principle of the electric drive system cooling structure provided in the first embodiment of the present application is:

[0099] When the second motor assembly 800 is working, the second rotor 810 can sequentially drive the second gear shaft 920, the intermediate shaft 930 and the differential 940 to drive the pump shaft of the mechanical pump 310 to rotate, so that the mechanical pump 310 works. Correspondingly, the electronic pump 320 can also work according to relevant control instructions. When the mechanical pump 310 and / or the electronic pump 320 is working, the cooling oil can enter the oil filter 103 from the oil filter inlet 104, and after being filtered by the filter element 106, it is discharged from the oil filter outlet 105, and further enters the upstream oil passage 210 of the mechanical pump through the oil supply port of the oil distribution plate 100. When the mechanical pump 310 is working, it can pump the cooling oil entering the upstream oil passage 210 of the mechanical pump into the mechanical pump 310, the downstream oil passage 220 of the mechanical pump and the confluent upstream oil passage 171 in sequence. When the electronic pump 320 is working, it can pump the cooling oil entering the upstream oil passage 210 of the mechanical pump from the electronic pump inlet 181 to the electronic pump 320, the electronic pump downstream oil passage 450 and the confluent upstream oil passage 171 in sequence. The cooling oil in the confluent upstream oil passage 171 can be pumped from the inlet of the oil cooler 101 to the oil cooling inlet channel 460, the oil cooler 101 and the oil cooling outlet channel 470 in sequence, and can be pumped from the outlet of the oil cooler 101 to the confluent downstream oil passage 172. The cooling oil entering the confluent downstream oil passage 172 can enter the first intermediate housing oil passage 480 and the first rear housing oil passage 610 in sequence through the first motor oil supply port 130, and then further enter the first rotor main oil passage 711 and the first spray assembly 721 to cool the first rotor 710 and the first stator 720 respectively. The cooling oil entering the confluent downstream oil passage 172 can also enter the second intermediate housing oil passage 490 and the second rear housing oil passage 620 in sequence through the second motor oil supply port 140, and then further enter the second rotor main oil passage 811 and the second spray assembly 821 to cool the second rotor 810 and the second stator 820 respectively. At the same time, the cooling oil entering the confluent downstream oil passage 172 can also enter the front housing oil passage 510 through the first shaft system oil supply port 121, and then further enter the first gear shaft main oil passage 911, the second gear shaft main oil passage 921 and the intermediate shaft main oil passage 931 to cool the first gear shaft 910, the second gear shaft 920 and the intermediate shaft 930 respectively; the cooling oil entering the confluent downstream oil passage 172 can also enter the third intermediate housing oil passage 401 through the second shaft system oil supply port 122, and then further enter the drive shaft main oil passage 951 to cool the drive shaft 950.

[0100] The present application sets an oil distribution plate 100, and reasonably sets an oil inlet 110 and oil supply ports at different positions on the oil distribution plate 100, and cooperates with different housing oil passages set on the front housing 500, the middle housing 400 and the rear housing 600, so as to respectively realize cooling of the first motor part, the second motor part and the gearbox part of the electric drive system. The cooling structure achieves its cooling effect without relying on the effectiveness and sensitivity of components such as solenoid valves, and thus has the characteristics of stability and reliability.

[0101] Embodiment 2

[0102] Embodiment 2 of the present application discloses an electric drive system, and the electric drive system includes any one of the electric drive system cooling structures provided in the present application.

[0103] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. An electric drive system cooling structure, characterized in that: The electric drive system cooling structure is used to cool the electric drive system. The electric drive system comprises an intermediate housing (400), a front housing (500), a rear housing (600), a first motor assembly (700), a second motor assembly (800) and a shaft assembly (900). The intermediate housing (400) is provided with a first motor chamber (410), a second motor chamber (420) and a shaft chamber (430). The front housing (500) covers one end of the intermediate housing (400) and seals the first motor chamber (410) and the second motor chamber (420). The first motor assembly (700) is arranged in the first motor chamber (410), the second motor assembly (800) is arranged in the second motor chamber (420), and the shaft assembly (900) is arranged in the shaft chamber (430). The electric drive system cooling structure comprises: An oil distribution plate (100) is disposed in the shaft system chamber (430) and comprises an oil inlet (110), a shaft system oil supply port (120), a first motor oil supply port (130) and a second motor oil supply port (140); the oil inlet (110) is connected to the shaft system oil supply port (120), the first motor oil supply port (130) and the second motor oil supply port (140) through an oil passage of the oil distribution plate (100); A pump assembly (300) for pumping cooling oil from the oil inlet (110) into the oil passage of the oil distribution plate (100); a first housing oil passage, which is arranged in the intermediate housing (400) and the rear housing (600), the first housing oil passage being in communication with the first motor oil supply port (130), and the first housing oil passage being used to cool the first motor assembly (700); A second housing oil passage, which is arranged in the intermediate housing (400) and the rear housing (600), the second housing oil passage being in communication with the second motor oil supply port (140), and the second housing oil passage being used to cool the second motor assembly (800); A third housing oil passage is arranged in the front housing (500) and the intermediate housing (400), and the third housing oil passage is connected to the shaft system oil supply port (120). The shaft system oil supply port (120) is used to cool the shaft system assembly (900).

2. The electric drive system cooling structure according to claim 1, characterized in that: The pump assembly (300) comprises a mechanical pump (310), wherein the mechanical pump (310) is arranged on the oil distribution plate (100), and the mechanical pump (310) is driven by the shaft system assembly (900). The oil passage of the oil distribution plate (100) comprises an upstream oil passage (210) of the mechanical pump and a downstream oil passage (220) of the mechanical pump. The upstream oil passage (210) of the mechanical pump is arranged between the oil inlet (110) and the mechanical pump (310), and the oil inlet (110) is connected to the shaft system chamber (430) and the upstream oil passage (210) of the mechanical pump. The downstream oil passage (220) of the mechanical pump is arranged downstream of the mechanical pump (310) and is connected to the first motor oil supply port (130), the second motor oil supply port (140) and the shaft system oil supply port (120).

3. The electric drive system cooling structure according to claim 2, characterized in that: The pump assembly (300) further comprises an electronic pump (320), wherein the electronic pump (320) is arranged on the intermediate housing (400), and an electronic pump upstream oil passage (440) and an electronic pump downstream oil passage (450) are also arranged on the intermediate housing (400). The oil distribution plate (100) is further provided with an electronic pump inlet (181) and an electronic pump outlet (182). The flow passage of the oil distribution plate (100) further comprises a confluent oil passage (170), wherein the mechanical pump downstream oil passage (220) is connected to the confluent oil passage (170), wherein the electronic pump upstream oil passage (440) is arranged between the electronic pump inlet (181) and the electronic pump (320), wherein the electronic pump inlet (181) is connected to the mechanical pump upstream oil passage (210) and the electronic pump upstream oil passage (440), and wherein the electronic pump downstream oil passage (450) is connected to the mechanical pump upstream oil passage (210) and the electronic pump upstream oil passage (440). The electronic pump (320) is arranged between the electronic pump (320) and the electronic pump outlet (182); the merging oil passage (170) is arranged between the electronic pump outlet (182) and the first motor oil supply port (130), between the electronic pump outlet (182) and the second motor oil supply port (140), and between the electronic pump outlet (182) and the shaft system oil supply port (120); the electronic pump outlet (182) is connected to the electronic pump downstream oil passage (450) and the merging oil passage (170); the first motor oil supply port (130) is connected to the merging oil passage (170) and the first housing oil passage; the second motor oil supply port (140) is connected to the merging oil passage (170) and the second housing oil passage; and the shaft system oil supply port (120) is connected to the merging oil passage (170) and the third housing oil passage.

4. The electric drive system cooling structure according to claim 3, characterized in that: The electric drive system cooling structure also includes an oil cooler (101), the intermediate housing (400) is provided with an oil cooling inlet channel (460) and an oil cooling outlet channel (470), the oil distribution plate (100) also includes an oil cooler inlet (191) and an oil cooler outlet (192), the confluent oil passage (170) includes a confluent upstream oil passage (171) and a confluent downstream oil passage (172), the mechanical pump downstream oil passage (220) and the electronic pump downstream oil passage (450) are both in communication with the confluent upstream oil passage (171), and the first housing oil passage and the second housing oil passage are connected to each other. The oil passage and the third housing oil passage are connected to the confluent downstream oil passage (172); the oil cooling inlet passage (460) is arranged between the oil cooler inlet (191) and the oil cooler (101); the oil cooler inlet (191) is connected to the confluent upstream oil passage (171) and the oil cooling inlet passage (460); the oil cooling outlet passage (470) is arranged between the oil cooler (101) and the oil cooler outlet (192); the oil cooler outlet (192) is connected to the oil cooling outlet passage (470) and the confluent downstream oil passage (172).

5. The electric drive system cooling structure according to claim 1, characterized in that: The first housing oil passage comprises a first intermediate housing (400) oil passage and a first rear housing (600) oil passage, the first intermediate housing (400) oil passage is arranged in the intermediate housing (400), the first rear housing (600) oil passage is arranged in the rear housing (600) and is communicated with the first intermediate housing (400) oil passage, the first motor assembly (700) comprises a first rotor (710) and a first stator (720), the electric drive system cooling structure further comprises a first rotor main oil passage (711) and a first spray assembly (721), the first rotor main oil passage (711) is arranged in the first rotor (710), the first spray assembly (721) is arranged on the top of the first stator (720), and the first rotor main oil passage (711) and the first spray assembly (721) are both communicated with the first rear housing (600) oil passage.

6. The electric drive system cooling structure according to claim 1, characterized in that: The second housing oil passage comprises a second intermediate housing (400) oil passage and a second rear housing (600) oil passage, the second intermediate housing (400) oil passage is arranged in the intermediate housing (400), the second rear housing (600) oil passage is arranged in the rear housing (600) and is communicated with the second intermediate housing (400) oil passage, the second motor assembly (800) comprises a second rotor (810) and a second stator (820), the electric drive system cooling structure further comprises a second rotor main oil passage (811) and a second spray assembly (821), the second rotor main oil passage (811) is arranged in the second rotor (810), the second spray assembly (821) is arranged on the top of the second stator (820), and the second rotor main oil passage (811) and the second spray assembly (821) are both communicated with the second rear housing (600) oil passage.

7. The electric drive system cooling structure according to claim 1, characterized in that: The third housing oil passage includes a front housing (500) oil passage, and the front housing (500) oil passage is arranged in the front housing (500). The shaft system assembly (900) includes a first gear shaft (910), a second gear shaft (920), an intermediate shaft (930) and a differential (940). The first gear shaft (910) is driven by the first motor assembly (700), the second gear shaft (920) is driven by the second motor assembly (800), the intermediate shaft (930) is driven by the second gear shaft (920), and the differential (940) is driven by the intermediate shaft (930). The electric drive system cooling structure also includes a first gear shaft main oil passage (911), a second gear shaft main oil passage (921) and an intermediate shaft main oil passage (931). The first gear shaft main oil passage (911) is arranged in the first gear shaft (910), and the second gear shaft main oil passage (921) is arranged in the second gear shaft. The wheel axle (920) is provided with the intermediate shaft main oil passage (931) in the intermediate shaft (930), the shaft system oil supply port (120) includes a first shaft system oil supply port (121), the front housing (500) is further provided with a first oil distribution chamber (520), a second oil distribution chamber (530) and a third oil distribution chamber (540), and the oil passage of the front housing (500) is provided between the first shaft system oil supply port (121) and the first oil distribution chamber (520). Between the first shaft system oil supply port (121) and the second oil distribution chamber (530), and between the first shaft system oil supply port (121) and the third oil distribution chamber (540), the first oil distribution chamber (520) is connected to the first gear shaft main oil passage (911), the second oil distribution chamber (530) is connected to the second gear shaft (920) oil passage, and the third oil distribution chamber (540) is connected to the intermediate shaft main oil passage (931).

8. The electric drive system cooling structure according to claim 7, characterized in that: The third housing oil passage also includes a third intermediate housing (400) oil passage, and the third intermediate housing (400) oil passage is arranged in the intermediate housing (400). The shaft system assembly (900) also includes a drive shaft (950), and the drive shaft (950) is driven by the first gear shaft (910). The electric drive system cooling structure also includes a drive shaft main oil passage (951), and the drive shaft main oil passage (951) is arranged in the drive shaft (950). The shaft system oil supply port (120) also includes a second shaft system oil supply port (122). A fourth oil distribution chamber (402) is also arranged on the intermediate housing (400). The third intermediate housing (400) oil passage is arranged between the second shaft system oil supply port (122) and the fourth oil distribution chamber (402), and the fourth oil distribution chamber (402) is communicated with the drive shaft main oil passage (951).

9. The electric drive system cooling structure according to claim 1, characterized in that: The electric drive system cooling structure also includes an oil filter (103), the oil filter (103) is connected to the oil distribution plate (100), the oil filter (103) includes an oil filter inlet (104), an oil filter outlet (105) and a filter element (106), the filter element (106) is arranged between the oil filter inlet (104) and the oil filter outlet (105), the oil filter outlet (105) is connected to the oil inlet (110), and the oil inlet (110) is connected to the shaft system chamber (430).

10. An electric drive system, characterized in that: The electric drive system comprises the electric drive system cooling structure according to any one of claims 1 to 9.

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