Drive axle, chassis and vehicle

Abstract

The utility model relates to a drive axle, a chassis and a vehicle. The drive axle comprises a first electric assembly, a second electric assembly and an oil pump. The oil pump is provided with a high-pressure cavity, a low-pressure cavity, an oil pump oil supply port and an oil pump oil return port, and cooling oil flowing into the low-pressure cavity from the oil pump oil return port can enter the high-pressure cavity after being pressurized by the oil pump and flows out through the oil pump oil supply port; an oil return port of the first electric assembly and an oil return port of the second electric assembly are respectively communicated to an oil return port of the oil pump, and an oil inlet of the first electric assembly and an oil inlet of the second electric assembly are respectively communicated to an oil supply port of the oil pump. According to the whole drive axle, the two electric assemblies are cooled and lubricated through one cooling and lubricating assembly, the number of parts is smaller, the structure is more compact, and the cost is lower.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle drive, and relates to a drive axle, a chassis and a vehicle. Background Art

[0002] The drive axle in the related art has two electric assemblies, and the cooling and lubrication circulation systems of each electric assembly are independent of each other, that is, there are two sets of independent cooling and lubrication circulation systems. In this way, the drive axle has a complex structure, many components and high costs. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a drive axle, a chassis and a vehicle aiming at the problem of many components in the drive axle in the related art.

[0004] To solve the above technical problem, on the one hand, the utility model provides a drive axle, which includes a first electric assembly, a second electric assembly and an oil pump; the oil pump has a high-pressure chamber, a low-pressure chamber, an oil pump oil supply port and an oil pump oil return port, and the cooling oil flowing into the low-pressure chamber from the oil pump oil return port can enter the high-pressure chamber after being pressurized by the oil pump and flow out through the oil pump oil supply port;

[0005] The oil return ports of the first electric assembly and the second electric assembly are respectively communicated with the oil pump oil return port, and the oil inlet ports of the first electric assembly and the second electric assembly are respectively communicated with the oil pump oil supply port.

[0006] For the drive axle according to the embodiment of the utility model, the oil return ports of the first electric assembly and the second electric assembly are respectively communicated with the oil pump oil return port, and the oil inlet ports of the first electric assembly and the second electric assembly are respectively communicated with the oil pump oil supply port. In this way, the whole drive axle uses a set of cooling and lubrication components to cool and lubricate the two electric assemblies, with fewer components, a more compact structure and lower costs.

[0007] Optionally, it further includes a bridge housing, the oil pump is arranged on the bridge housing, the first electric assembly is installed at one end of the bridge housing in the length direction, and the second electric assembly is installed at the other end of the bridge housing in the length direction.

[0008] Optionally, the first electric assembly has a first cooling and lubricating oil path, the second electric assembly has a second cooling and lubricating oil path, the oil return port of the first electric assembly is the outlet of the first cooling and lubricating oil path, the oil return port of the second electric assembly is the outlet of the second cooling and lubricating oil path, the oil inlet port of the first electric assembly is the inlet of the first cooling and lubricating oil path, and the oil inlet port of the second electric assembly is the inlet of the second cooling and lubricating oil path.

[0009] Optionally, the drive axle further includes an oil storage tank disposed on the axle housing. The oil storage tank includes a first oil chamber having a first oil inlet, a second oil inlet, and a first oil outlet. The oil return port of the first electric assembly is connected to the first oil inlet, the oil return port of the second electric assembly is connected to the second oil inlet, and the first oil outlet is communicated with the oil return port of the oil pump.

[0010] Optionally, the oil storage tank further includes a second oil chamber having a third oil inlet and a second oil outlet. The third oil inlet is communicated with the oil supply port of the oil pump, and the oil inlet of the first electric assembly and the oil inlet of the second electric assembly are respectively communicated to the second oil outlet.

[0011] Optionally, the oil storage tank further includes a third oil chamber having a third oil outlet, a fourth oil outlet, and a fourth oil inlet. The fourth oil inlet is communicated with the second oil outlet, the oil inlet of the first electric assembly is communicated with the third oil outlet, and the oil inlet of the second electric assembly is communicated with the fourth oil outlet.

[0012] Optionally, the drive axle further includes an oil cooler connected between the second oil outlet and the fourth oil inlet for cooling the cooling oil flowing out of the second oil chamber and then supplying it to the third oil chamber.

[0013] Optionally, the interior of the axle housing has a cavity, and the oil storage tank is disposed in the cavity;

[0014] The oil storage tank is integrally formed with the axle housing, or the oil storage tank and the axle housing are separately provided and fixed to each other.

[0015] Optionally, the oil pump is disposed in the cavity and is located outside the oil storage tank;

[0016] Or,

[0017] The oil pump is disposed outside the axle housing.

[0018] Optionally, the drive axle further includes an oil cooler for cooling the cooling oil circulating in the first electric assembly and / or the second electric assembly.

[0019] Optionally, the oil cooler has a coolant channel adapted to exchange heat with the cooling oil, and the coolant channel is adapted to be connected in series in the vehicle's overall liquid cooling system.

[0020] Optionally, the oil storage tank has an outer opening, and the oil cooler is installed outside the oil storage tank and seals the outer opening of the oil storage tank.

[0021] Optionally, the drive axle further includes a first filter and a second filter. The first filter is disposed at the first oil inlet, and the second filter is disposed at the second oil inlet.

[0022] Optionally, the first electric assembly includes a first motor, a first speed reducer, and a first motor mounting seat. The output shaft of the first motor is connected to the input end of the first speed reducer, and the output end of the first speed reducer is adapted to be connected to a first wheel; the housing of the first speed reducer is mounted at one end in the longitudinal direction of the axle housing, the first motor mounting seat is mounted on the bottom side of the first speed reducer, and the first motor is mounted on the first motor mounting seat; and / or,

[0023] The second electric assembly includes a second motor, a second speed reducer, and a second motor mounting seat. The output shaft of the second motor is connected to the input end of the second speed reducer, and the output end of the second speed reducer is adapted to be connected to a second wheel; the housing of the second speed reducer is mounted at the other end in the longitudinal direction of the axle housing, the second motor mounting seat is mounted on the bottom side of the second speed reducer, and the second motor is mounted on the second motor mounting seat.

[0024] On the other hand, an embodiment of the present invention further provides a chassis including the above-mentioned drive axle.

[0025] The chassis provided by the embodiment of the present invention has all the advantages of the above-mentioned drive axle.

[0026] On yet another aspect, an embodiment of the present invention further provides a vehicle including the above-mentioned drive axle or chassis.

[0027] The vehicle is preferably a new energy commercial vehicle, and of course, it can also be a new energy car.

[0028] The vehicle provided by the embodiment of the present invention has all the advantages of the above-mentioned drive axle. Description of the Drawings

[0029] Figure 1 is a structural diagram of a drive axle provided by an embodiment of the present invention;

[0030] Figure 2 is a structural block diagram of a drive axle provided by an embodiment of the present invention.

[0031] The reference numerals in the specification are as follows:

[0032] 1. Axle housing;

[0033] 2. First electric assembly; 21. First cooling lubricating oil circuit; 211. First cooling oil circuit; 212. First oil collecting cavity; 22. First motor; 23. First speed reducer; 24. First motor mounting seat;

[0034] 3. Second electric assembly; 31. Second cooling lubricating oil path; 311. Second cooling oil path; 312. Second oil collecting cavity; 32. Second motor; 33. Second reducer; 34. Second motor mounting seat;

[0035] 4. Cooling and lubricating component; 41. Oil pump; 411. Oil supply port of the oil pump; 412. Oil return port of the oil pump; 42. Oil storage tank; 421. First oil cavity; 4211. First oil inlet; 4212. Second oil inlet; 4213. First oil outlet; 422. Second oil cavity; 4221. Third oil inlet; 4222. Second oil outlet; 423. Third oil cavity; 4231. Third oil outlet; 4232. Fourth oil outlet; 4233. Fourth oil inlet; 43. Oil cooler; 44. First filter; 45. Second filter;

[0036] 5. First pump oil pipe;

[0037] 6. First oil suction pipe;

[0038] 7. Second pump oil pipe;

[0039] 8. Second oil suction pipe;

[0040] 10. Vehicle liquid cooling system; 20. Cooling water inlet pipe; 30. Cooling water outlet pipe. Detailed implementation manner

[0041] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0042] See Figures 1 to 2 , a drive axle provided by an embodiment of the present utility model includes a first electric assembly 2, a second electric assembly 3 and an oil pump 41. The oil pump 41 has a high-pressure cavity, a low-pressure cavity, an oil supply port 411 of the oil pump and an oil return port 412 of the oil pump. The cooling oil flowing into the low-pressure cavity through the oil return port 412 of the oil pump can enter the high-pressure cavity after being pressurized by the oil pump 41 and flow out through the oil supply port 411 of the oil pump; the oil return port of the first electric assembly 2 and the oil return port of the second electric assembly 3 are respectively connected to the oil return port 412 of the oil pump, and the oil inlet of the first electric assembly 2 and the oil inlet of the second electric assembly 3 are respectively connected to the oil supply port 411 of the oil pump.

[0043] The oil pump 41 can be a gear pump, a plunger pump, a twin-screw pump, an impeller pump, etc.

[0044] According to the drive axle of the embodiment of the present utility model, the oil return ports of the first electric assembly 2 and the second electric assembly 3 are respectively communicated with the oil return port 412 of the oil pump, and the oil inlet ports of the first electric assembly 2 and the second electric assembly 3 are respectively communicated with the oil supply port 411 of the oil pump. In this way, the entire drive axle uses a set of cooling and lubrication components 4 (a single oil pump 41) to cool and lubricate the two electric assemblies, with fewer components, a more compact structure, and lower costs.

[0045] In one embodiment, the oil pump 41 constitutes the cooling and lubrication component 4.

[0046] In one embodiment, the drive axle further includes a bridge housing 1, the oil pump 41 is disposed on the bridge housing 1, the first electric assembly 2 is installed at one end in the length direction of the bridge housing 1, and the second electric assembly 3 is installed at the other end in the length direction of the bridge housing 1.

[0047] In one embodiment, the first electric assembly 2 has a first cooling and lubricating oil path 21, the second electric assembly 3 has a second cooling and lubricating oil path 31, the oil return port of the first electric assembly 2 is the outlet of the first cooling and lubricating oil path 21, the oil return port of the second electric assembly 3 is the outlet of the second cooling and lubricating oil path 31, the oil inlet port of the first electric assembly 2 is the inlet of the first cooling and lubricating oil path 21, and the oil inlet port of the second electric assembly 3 is the inlet of the second cooling and lubricating oil path 31.

[0048] In one embodiment, the drive axle further includes an oil storage tank 42, the oil storage tank 42 is disposed on the bridge housing 1, the oil storage tank 42 includes a first oil chamber 421, the first oil chamber 421 has a first oil inlet 4211, a second oil inlet 4212 and a first oil outlet 4213, the oil return port of the first electric assembly 2 is connected to the first oil inlet 4211, the oil return port of the second electric assembly 3 is connected to the second oil inlet 4212, and the first oil outlet 4213 is communicated with the oil return port 412 of the oil pump. The oil storage tank 42 is arranged on the bridge housing 1, and its arrangement space is large, so a larger-capacity oil storage tank 42 can be arranged to enhance the cooling performance of the first electric assembly 2 and the second electric assembly 3, and extend the cycle or mileage of after-sales maintenance and replacement of the cooling oil.

[0049] In one embodiment, the oil storage tank 42 further includes a second oil chamber 422, the second oil chamber 422 has a third oil inlet 4221 and a second oil outlet 4222, the third oil inlet 4221 is communicated with the oil supply port 411 of the oil pump, and the oil inlet ports of the first electric assembly 2 and the second electric assembly 3 are respectively communicated with the second oil outlet 4222.

[0050] In one embodiment, the oil storage tank 42 further includes a third oil chamber 423, the third oil chamber 423 having a third oil outlet 4231, a fourth oil outlet 4232 and a fourth oil inlet 4323. The fourth oil inlet 4233 communicates with the second oil outlet 4222. The oil inlet of the first electric assembly 2 communicates with the third oil outlet 4231, and the oil inlet of the second electric assembly 3 communicates with the fourth oil outlet 4232.

[0051] In one embodiment, the oil pump 41 and the oil storage tank 42 form a cooling and lubricating assembly 4.

[0052] In one embodiment, the drive axle further includes an oil cooler 43, and the oil cooler 43 is used to cool the cooling oil circulating in the first electric assembly 2 and the second electric assembly 3.

[0053] In other embodiments, the oil cooler 43 is used to cool the cooling oil circulating in the first electric assembly 2 or the second electric assembly 3.

[0054] In one embodiment, the oil pump 41 and the oil cooler 43 form a cooling and lubricating assembly 4.

[0055] In one embodiment, the oil cooler 43 is disposed on the axle housing 1. In this way, the oil pump 41, the oil storage tank 42 and the oil cooler 43 are all disposed on the axle housing 1, without other auxiliary brackets, and the structure is compact.

[0056] In one embodiment, the oil pump 41, the oil storage tank 42 and the oil cooler 43 form a cooling and lubricating assembly 4. Compared with the prior art, only one oil pump 41, one oil storage tank 42 and one oil cooler 43 are provided, with fewer components, a more compact structure and lower costs.

[0057] In one embodiment, the oil cooler 43 has a coolant channel adapted to exchange heat with the cooling oil, and the coolant channel is adapted to be connected in series in the vehicle's overall liquid cooling system 10. Specifically, the inlet of the coolant channel of the oil cooler 43 is connected to the coolant outlet of the overall liquid cooling system 10 through a cooling inlet pipe 20, and the outlet of the coolant channel of the oil cooler 43 is connected to the coolant inlet of the overall liquid cooling system 10 through a cooling outlet pipe 30. The oil cooler 43 has a coolant channel, and a cooling oil channel is formed between the oil cooler 43 and the oil storage tank 42. The cooling oil channel communicates with the second oil chamber 422 and the third oil chamber 423 (the coolant channel of the oil cooler 43 is connected between the second oil chamber 422 and the third oil chamber 423). When the cooling oil flows through the oil path corresponding to the cooling oil channel, it exchanges heat with the coolant in the coolant channel to be cooled.

[0058] In one embodiment, the first oil chamber 421, the second oil chamber 422, and the third oil chamber 423 are arranged in sequence along the front-rear direction of the vehicle. That is, the first oil chamber 421, the second oil chamber 422, and the third oil chamber 423 are arranged in sequence from front to back, or the first oil chamber 421, the second oil chamber 422, and the third oil chamber 423 are arranged in sequence from back to front.

[0059] In one embodiment, referring to Figure 2 , the drive axle further includes a first filter 44 and a second filter 45. The first filter 44 is disposed at the first oil inlet 4211 to filter the cooling oil recovered from the first cooling lubricating oil path 21, so as to prevent impurities in the cooling oil from entering the oil pump 41 and damaging the oil pump 41. Similarly, the second filter 45 is disposed at the second oil inlet 4212 to filter the cooling oil recovered from the second cooling lubricating oil path 31, so as to prevent impurities in the cooling oil from entering the oil pump 41 and damaging the oil pump 41.

[0060] In one embodiment, the oil storage tank 42 has an outer opening, and the oil cooler 43 is installed outside the oil storage tank 42 and seals the outer opening of the oil storage tank 42. Specifically, the base cover of the oil cooler 43 is sealingly connected to the outer opening of the oil storage tank 42, and the side wall of the reused oil cooler 43 is used as the cover of the oil storage tank 42, which not only saves a part but also makes the structure of the drive axle more compact.

[0061] In one embodiment, referring to Figure 1 and Figure 2 , the first electric assembly 2 includes a first motor 22, a first speed reducer 23, and a first motor mounting seat 24. The output shaft of the first motor 22 is connected to the input end of the first speed reducer 23, and the output end of the first speed reducer 23 is adapted to be connected to a first wheel; the housing of the first speed reducer 23 is installed at one end in the length direction of the axle housing 1, and the first motor mounting seat 24 is installed on the bottom side of the first speed reducer 23 ( Figure 1 the inward side in the direction perpendicular to the paper surface in Figure 1 ), and the first motor 22 is installed on the first motor mounting seat 24; the second electric assembly 3 includes a second motor 32, a second speed reducer 33, and a second motor mounting seat 34. The output shaft of the second motor 32 is connected to the input end of the second speed reducer 33, and the output end of the second speed reducer 33 is adapted to be connected to a second wheel; the housing of the second speed reducer 33 is installed at the other end in the length direction of the axle housing 1, and the second motor mounting seat is installed on the bottom side of the second speed reducer 33 (

[0062] In one embodiment, referring to Figure 2 , the first cooling lubricating oil path 21 includes a first cooling oil path 211 and a first oil collecting chamber 212. The first oil collecting chamber 212 is formed within the first motor mounting base 24. The inlet of the first cooling oil path 211 is the inlet of the first cooling lubricating oil path 21. The inlet of the first cooling oil path 211 is connected to the third oil outlet 4231 through a first pump oil pipe 5. After the cooling oil of the first cooling oil path 211 cools and lubricates the first motor 22 and the first speed reducer 23, (depending on gravity to drip or slide) it converges in the first oil collecting chamber 212. The first oil collecting chamber 212 is connected to the first oil inlet 4211 through a first suction oil pipe 6. The second cooling lubricating oil path 31 includes a second cooling oil path 311 and a second oil collecting chamber 312. The second oil collecting chamber 312 is formed within the second motor mounting base 34. The inlet of the second cooling oil path 311 is the inlet of the second cooling lubricating oil path 31. The inlet of the second cooling oil path 311 is connected to the fourth oil outlet 4232 through a second pump oil pipe 7. After the cooling oil of the second cooling oil path 311 cools and lubricates the second motor 32 and the second speed reducer 33, (depending on gravity to drip or slide) it converges in the second oil collecting chamber 312. The second oil collecting chamber 312 is connected to the second oil inlet 422 through a second suction oil pipe 8.

[0063] In one embodiment, the interior of the axle housing 1 has a cavity, and the oil storage tank 42 is disposed in the cavity; the oil storage tank 42 and the axle housing 1 are integrally formed. In this way, the oil storage tank 42 and the axle housing 1 are one component, reducing the number of components and the assembly process.

[0064] In one embodiment, the oil pump 41 is disposed in the cavity of the axle housing 1, and the oil pump 41 is located outside the oil storage tank 42; for example, the oil pump 41 is fixedly installed on the outer side wall of the oil storage tank 42. In this way, the installation space inside the axle housing is effectively utilized, making the structure of the drive axle more compact.

[0065] In addition, the drive axle of the above embodiment further has the following advantages:

[0066] (1) The first motor 22 and the first speed reducer 23 share the same oil. The first motor 22 and the first speed reducer 23 are cooled and lubricated with the same cooling oil. The second motor 32 and the second speed reducer 33 share the same oil (using the same cooling oil). The second motor 32 and the second speed reducer 33 are cooled and lubricated with the same cooling oil, and the lubrication method is simple.

[0067] (2) The oil pump 41, oil storage tank 42, oil cooler 43, first filter 44 and first filter 45 are integrated inside the axle housing 1 and are no longer arranged inside the speed reducer. The layout of the entire drive axle is easier, with good versatility and is easy to disassemble, repair, maintain and replace.

[0068] (3) At high speeds, the speed reducer needs to add more gear oil to fully lubricate the gears and bearings through splash lubrication. In this case, the oil churning loss is large, the power consumption is high, which causes the oil temperature to rise sharply, affecting the service life of the bearings and reducing the efficiency at the same time. In this embodiment, the lubricating oil level can be lowered and splash lubrication is not used, which can solve the problem of high temperature of the speed reducer.

[0069] (4) At low speeds, the bearing of the speed reducer requires less oil, but due to the large amount of oil added, the oil churning loss is large, affecting the efficiency of the speed reducer. In this embodiment, quantitative active lubrication of the speed reducer can be achieved under different operating conditions, increasing the reliability of the speed reducer and improving the efficiency of the speed reducer at the same time.

[0070] (5) The vehicle controller is electrically connected to the oil pump controller and can control the speed of the oil pump 41 according to different rotational speed conditions and power of the vehicle. Different rotational speeds of the oil pump 41 correspond to different flow rates. As the rotational speed and power of the first motor 22 and the second motor 32 increase, the motor rotational speed of the oil pump 41 increases, and the flow rate of the oil pump 41 increases accordingly, thus realizing quantitative active lubrication between high speeds and low speeds, reducing the amount of oil added to the speed reducer, reducing the oil churning loss, and improving the transmission efficiency of the speed reducer.

[0071] In another embodiment, the oil storage tank 42 and the axle housing 1 are separately provided and fixed to each other.

[0072] In another embodiment, the oil pump 41 can also be arranged outside the axle housing 1. At this time, by changing the structure of the axle housing 1 and designing the connection method of the oil pump 41 and the oil pipe, the same technical effects as those of the Figure 1 shown embodiment can also be achieved.

[0073] In addition, the embodiment of the present utility model also provides a chassis, including the drive axle of the above embodiment.

[0074] The chassis provided by the embodiment of the present utility model has all the advantages of the above drive axle.

[0075] In addition, the embodiment of the present utility model also provides a vehicle, including the drive axle or chassis of the above embodiment.

[0076] The vehicle is preferably a new energy commercial vehicle, and of course, it can also be a new energy car.

[0077] The vehicle provided by the embodiment of the present utility model has all the advantages of the above drive axle.

[0078] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A drive axle, characterized in that: The invention comprises a first electric assembly, a second electric assembly and an oil pump, wherein the oil pump has a high-pressure chamber, a low-pressure chamber, an oil pump oil supply port and an oil pump oil return port, and the cooling oil flowing into the low-pressure chamber from the oil pump oil return port can enter the high-pressure chamber after being pressurized by the oil pump, and flow out through the oil pump oil supply port; The oil return port of the first electric assembly and the oil return port of the second electric assembly are respectively connected to the oil return port of the oil pump, and the oil inlet port of the first electric assembly and the oil inlet port of the second electric assembly are respectively connected to the oil supply port of the oil pump.

2. The drive axle according to claim 1, characterized in that: It also includes a bridge housing, the oil pump is arranged on the bridge housing, the first electric assembly is installed at one end of the bridge housing in the length direction, and the second electric assembly is installed at the other end of the bridge housing in the length direction.

3. The drive axle according to claim 2, characterized in that: The first electric assembly has a first cooling and lubricating oil circuit, and the second electric assembly has a second cooling and lubricating oil circuit. The oil return port of the first electric assembly is the outlet of the first cooling and lubricating oil circuit, and the oil return port of the second electric assembly is the outlet of the second cooling and lubricating oil circuit. The oil inlet of the first electric assembly is the inlet of the first cooling and lubricating oil circuit, and the oil inlet of the second electric assembly is the inlet of the second cooling and lubricating oil circuit.

4. The drive axle according to claim 3, characterized in that: The drive axle also includes an oil storage tank, which is arranged on the bridge housing. The oil storage tank includes a first oil chamber, the first oil chamber has a first oil inlet, a second oil inlet and a first oil outlet, the oil return port of the first electric assembly is connected to the first oil inlet, the oil return port of the second electric assembly is connected to the second oil inlet, and the first oil outlet is connected to the oil return port of the oil pump.

5. The drive axle according to claim 4, characterized in that: The oil storage tank also includes a second oil chamber, the second oil chamber has a third oil inlet and a second oil outlet, the third oil inlet is connected to the oil pump oil supply port, and the oil inlet of the first electric assembly and the oil inlet of the second electric assembly are respectively connected to the second oil outlet.

6. The drive axle according to claim 5, characterized in that: The oil storage tank also includes a third oil chamber, which has a third oil outlet, a fourth oil outlet and a fourth oil inlet, the fourth oil inlet is connected to the second oil outlet, the oil inlet of the first electric assembly is connected to the third oil outlet, and the oil inlet of the second electric assembly is connected to the fourth oil outlet.

7. The drive axle according to claim 6, characterized in that: The drive axle further includes an oil cooler, which is connected between the second oil outlet and the fourth oil inlet and is used for cooling the cooling oil flowing out of the second oil chamber and then providing it to the third oil chamber.

8. The drive axle according to claim 4, characterized in that: The interior of the axle housing has a cavity, and the oil storage tank is arranged in the cavity; The oil storage tank and the bridge housing are integrally formed, or the oil storage tank and the bridge housing are separately arranged and fixed to each other.

9. The drive axle according to claim 8, characterized in that: The oil pump is disposed in the cavity, and the oil pump is located outside the oil storage tank; or, The oil pump is arranged outside the axle housing.

10. The drive axle according to claim 4, characterized in that: The drive axle further includes an oil cooler for cooling cooling oil circulating in the first electric assembly and / or the second electric assembly.

11. The drive axle according to claim 10, characterized in that: The oil cooler has a coolant channel suitable for exchanging heat with cooling oil, and the coolant channel is suitable for being connected in series in a whole vehicle liquid cooling system of the vehicle.

12. The drive axle according to claim 10, characterized in that: The oil storage tank has an outer opening, and the oil cooler is installed on the outer side of the oil storage tank and seals the outer opening of the oil storage tank.

13. The drive axle according to claim 4, characterized in that: The drive axle further includes a first filter and a second filter, wherein the first filter is disposed at the first oil inlet, and the second filter is disposed at the second oil inlet.

14. The drive axle according to claim 4, characterized in that: The first electric assembly includes a first motor, a first reducer and a first motor mounting seat, the output shaft of the first motor is connected to the input end of the first reducer, and the output end of the first reducer is suitable for connecting to a first wheel; The housing of the first reducer is mounted at one end of the bridge housing in the length direction, the first motor mounting seat is mounted on the bottom side of the first reducer, and the first motor is mounted on the first motor mounting seat; and / or, The second electric assembly includes a second motor, a second reducer and a second motor mounting seat, the output shaft of the second motor is connected to the input end of the second reducer, and the output end of the second reducer is suitable for connecting to a second wheel; The housing of the second reducer is mounted on the other end of the bridge housing in the length direction, the second motor mounting seat is mounted on the bottom side of the second reducer, and the second motor is mounted on the second motor mounting seat.

15. The drive axle according to claim 14, characterized in that: The first cooling and lubricating oil circuit includes a first cooling oil circuit and a first oil collecting chamber, the first oil collecting chamber is formed in the first motor mounting seat, the inlet of the first cooling oil circuit is the inlet of the first cooling and lubricating oil circuit, the cooling oil of the first cooling oil circuit cools and lubricates the first motor and the first reducer, and then collects in the first oil collecting chamber, the first oil collecting chamber is connected to the first oil inlet; and / or, The second cooling and lubricating oil circuit includes a second cooling oil circuit and a second oil collecting chamber. The second oil collecting chamber is formed in the second motor mounting base. The entrance of the second cooling oil circuit is the entrance of the second cooling and lubricating oil circuit. The cooling oil of the second cooling oil circuit cools and lubricates the second motor and the second reducer, and then collects in the second oil collecting chamber. The second oil collecting chamber is connected to the second oil inlet.

16. A chassis, characterized in that: A drive axle comprising any one of claims 1-15.

17. A vehicle, characterized in that: It comprises the drive axle according to any one of claims 1 to 15 or the chassis according to claim 16.

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