Hydraulic system and automobile

Abstract

The utility model relates to the technical field of automobile lubricating and cooling, in particular to a hydraulic system and an automobile, and the hydraulic system comprises a generator, a driving motor, an electric pump, a first oil supply assembly, a mechanical pump and a second oil supply assembly. The first oil supply assembly communicates with the first rotor through a first pressure valve and communicates with the second rotor through a second pressure valve. The output end of the second oil supply assembly is in one-way communication with the output end of the first oil supply assembly through a third pressure valve. The oil pressure of the output end of the first oil supply assembly is smaller than that of the output end of the second oil supply assembly. Through reasonable oil distribution of the driving motor and the generator, energy consumption of the driving motor and the generator is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of automobile lubrication and cooling, and in particular to a hydraulic system and an automobile. Background Art

[0002] A car is a means of transportation that helps users travel through the coordination of multiple parts.

[0003] The automobile includes a drive motor, a generator and an oil pump. The drive motor and the generator generate heat during operation, and the oil pump supplies oil to the drive motor and the generator for lubrication and cooling.

[0004] In the related art, in order to maintain the normal operation of the generator and the drive motor, the oil pump generally consumes a lot of energy and is prone to overheating, resulting in power limitation. Utility Model Content

[0005] In view of this, the present application provides a hydraulic system and a vehicle to reduce the energy consumption for maintaining the normal operation of the generator and the drive motor.

[0006] Specifically, the following technical solutions are included:

[0007] The first aspect of the present application provides a hydraulic system, which includes a generator, a drive motor, an electric pump, a first oil supply assembly, a mechanical pump and a second oil supply assembly. The generator includes a first rotor and a first stator. The drive motor includes a second rotor and a second stator. The electric pump is used to deliver oil to the first rotor, the second rotor and the second stator through the first oil supply assembly. The first oil supply assembly is connected to the first rotor through a first pressure valve, and is connected to the second rotor through a second pressure valve. The mechanical pump is used to deliver oil to the first rotor, the second rotor, the second stator, the first stator and the output end of the first oil supply assembly through the second oil supply assembly. The output end of the second oil supply assembly is unidirectionally connected to the output end of the first oil supply assembly through a third pressure valve. The oil pressure at the output end of the first oil supply assembly is less than the oil pressure at the output end of the second oil supply assembly.

[0008] In the above technical solution, the first oil supply assembly includes a bypass valve and an oil cooler, the output end of the first oil supply assembly and the electric pump are respectively connected to the bypass valve, and the output end of the first oil supply assembly and the electric pump are respectively connected to the oil cooler.

[0009] In the above technical solution, the first oil supply assembly also includes a first one-way valve and a second one-way valve, the first one-way valve connects the electric pump and the bypass valve, and connects the electric pump and the oil cooler, and the second one-way valve connects the bypass valve and the oil cooler respectively.

[0010] In the above technical solution, the second oil supply assembly includes a fourth pressure valve and a regulating valve, the fourth pressure valve and the regulating valve are respectively connected to the mechanical pump, the fourth pressure valve is used to transport oil to the first stator, and the regulating valve is connected to the fourth pressure valve to control the opening of the fourth pressure valve.

[0011] In the above technical solution, the hydraulic system includes a clutch, and the second oil supply assembly also includes a switch valve, and the switch valve connects the mechanical pump and the clutch.

[0012] In the above technical solution, the hydraulic system includes a clutch, and the first oil supply assembly and the second oil supply assembly are both connected to the clutch.

[0013] In the above technical solution, the hydraulic system includes a pressure relief valve, which is located between the third pressure valve and the second oil supply assembly and is connected to the output ends of the third pressure valve and the second oil supply assembly respectively.

[0014] In the above technical solution, the ratio of the oil flow rate of the second stator to the oil flow rate of the second rotor is greater than or equal to 4:1.

[0015] In the above technical solution, the ratio of the oil flow rate of the first stator to the oil flow rate of the first rotor is greater than or equal to 4:1.

[0016] A second aspect of the present application provides a car, comprising a hydraulic system as described in the above technical solution.

[0017] The beneficial effects of the technical solution provided by the embodiment of the present application include at least: the mechanical pump and the electric pump can lubricate and cool the first rotor, the second rotor and the second stator by delivering oil to these components. The electric pump delivers oil to the first stator through the second oil supply assembly, which can improve the independence of lubrication and cooling of the first stator, thereby improving the rationality of oil distribution of the hydraulic system of the present application. The first oil supply assembly is connected to the first rotor through the first pressure valve, and is connected to the second rotor through the second pressure valve, which can reduce excessive oil delivery to the first rotor and the second rotor to reduce oil waste. The output end of the second oil supply assembly is unidirectionally connected to the output end of the first oil supply assembly through the third pressure valve, which is conducive to the mechanical pump to deliver oil to the first rotor, the second rotor and the second stator through the second oil supply assembly, and improve the oil supply sealing of the second oil supply assembly, which is conducive to the user to deliver the driven oil to these components according to the actual needs through the mechanical pump to improve the rationality of oil distribution. The oil pressure at the output end of the first oil supply assembly is lower than the oil pressure at the output end of the second oil supply assembly, which is beneficial to reducing the amount of oil delivered to the first stator and can also lubricate and cool the drive motor and generator at the same time according to actual needs. This can reduce the energy consumption of the present application and maintain its normal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of the structure of a hydraulic system provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the working condition of the first hydraulic system provided in the embodiment of the present application;

[0021] Figure 3 A schematic diagram of the working condition of the second hydraulic system provided in the embodiment of the present application;

[0022] Figure 4 A schematic diagram of the working condition of the third hydraulic system provided in an embodiment of the present application.

[0023] The reference numerals in the figures represent respectively:

[0024] 1. generator; 11. first rotor; 12. first stator;

[0025] 2. driving motor; 21. second rotor; 22. second stator;

[0026] 3. Electric pump;

[0027] 4. First oil supply assembly; 41. First pressure valve; 42. Second pressure valve; 43. Bypass valve; 44. Oil cooler; 45. First check valve; 46. Second check valve;

[0028] 5. Mechanical pump;

[0029] 6. Second oil supply assembly; 61. Third pressure valve; 62. Fourth pressure valve; 63. Regulating valve; 64. Switching valve;

[0030] 7. Clutch;

[0031] 8. Pressure relief valve;

[0032] 9. Shaft teeth.

[0033] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] The directional nouns involved in the embodiments of the present application, such as "upper", "lower", "side", etc., are generally represented by Figure 1 The relative relationship of the orientation shown in the figure is used as the basis, and these orientation terms are used only to more clearly describe the relationship between structures, not to describe absolute orientation. When the product is placed in different postures, the orientation may change, for example, "up" and "down" may be interchangeable.

[0036] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as commonly understood by those of ordinary skill in the art.

[0037] In order to make the technical solutions and advantages of the present application more clear, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0038] A first aspect of the present application provides a hydraulic system, such as Figure 1As shown, the hydraulic system includes a generator 1, a drive motor 2, an electric pump 3, a first oil supply assembly 4, a mechanical pump 5 and a second oil supply assembly 6. Among them, the generator 1 includes a first rotor 11 and a first stator 12. The drive motor 2 includes a second rotor 21 and a second stator 22. The electric pump 3 is used to deliver oil to the first rotor 11, the second rotor 21 and the second stator 22 through the first oil supply assembly 4. The first oil supply assembly 4 is connected to the first rotor 11 through the first pressure valve 41, and is connected to the second rotor 21 through the second pressure valve 42. The mechanical pump 5 is used to deliver oil to the first rotor 11, the second rotor 21, the second stator 22, the first stator 12 and the output end of the first oil supply assembly 4 through the second oil supply assembly 6. The output end of the second oil supply assembly 6 is unidirectionally connected to the output end of the first oil supply assembly 4 through the third pressure valve 61. The oil pressure at the output end of the first oil supply assembly 4 is less than the oil pressure at the output end of the second oil supply assembly 6.

[0039] It can be understood that the mechanical pump 5 and the electric pump 3 can lubricate and cool the first rotor 11, the second rotor 21 and the second stator 22 by delivering oil to these components. The electric pump 3 delivers oil to the first stator 12 through the second oil supply assembly 6, which can improve the independence of lubrication and cooling of the first stator 12, thereby improving the rationality of oil distribution in the hydraulic system of the present application. The first oil supply assembly 4 is connected to the first rotor 11 through the first pressure valve 41, and is connected to the second rotor 21 through the second pressure valve 42, which can reduce excessive oil delivery to the first rotor 11 and the second rotor 21 to reduce oil waste. The output end of the second oil supply assembly 6 is unidirectionally connected to the output end of the first oil supply assembly 4 through the third pressure valve 61, which is conducive to the mechanical pump 5 to deliver oil to the first rotor 11, the second rotor 21 and the second stator 22 through the second oil supply assembly 6, and improve the oil supply sealing of the second oil supply assembly 6, which is conducive to the user to deliver the driven oil to these components according to the actual needs through the mechanical pump 5 to improve the rationality of oil distribution. The oil pressure at the output end of the first oil supply assembly 4 is lower than the oil pressure at the output end of the second oil supply assembly 6, which is beneficial to reducing the amount of oil delivered to the first stator 12, and can also lubricate and cool the drive motor 2 and the generator 1 at the same time according to actual needs, thereby reducing the energy consumption of the present application and maintaining its normal operation.

[0040] Due to the limited space in the car, the oil pump generally relies on a single port to lubricate multiple parts at the same time. Since the working conditions of these parts are different, the port cannot take into account the lubrication needs of all parts, so it is easy for some parts to fail due to insufficient lubrication. In addition, maintaining the lubrication of multiple parts will also lead to higher energy consumption of the oil pump. Higher energy consumption will generate more heat, which will easily limit the power of the oil pump.

[0041] The present application uses the electric pump 3 to deliver oil to the first rotor 11, the second rotor 21 and the second stator 22, which can maintain the normal operation of the three. The working time of the generator 1 is short, and the working temperature of the first stator 12 is low. The mechanical pump 5 is used to lubricate and cool it through the second oil supply assembly 6. According to the actual needs, the lubrication and cooling work of the first stator 12 can be separated from the three, so that the amount of oil delivered to the first stator 12 can be initially reduced. Further, the hydraulic system of the present application is also connected to the first rotor 11 through the first pressure valve 41 and the second pressure valve 42 to the second rotor 21. On the one hand, it can reduce the oil delivery to the first rotor 11 and the second rotor 21 when the oil pressure generated by the electric pump 3 is small, so that the lubrication efficiency of the second stator 22 can be improved. On the other hand, it is also conducive to providing the first rotor 11 and the second rotor 21 with oil with sufficient pressure and oil volume, so that the lubrication and cooling effect of the first rotor 11 and the second rotor 21 can be improved. Finally, the oil pressure at the output end of the first oil supply assembly 4 is lower than the oil pressure at the output end of the second oil supply assembly 6, which is beneficial for the pressurized oil generated by the mechanical pump 5 to be delivered to the first rotor 11, the second rotor 21 and the second stator 22 through the third pressure valve 61, thereby helping to improve the lubrication and cooling effects of the above three.

[0042] In the embodiment of the present application, the hydraulic system has three working conditions, specifically including:

[0043] 1. If Figure 2 The electric pump 3 works, and the mechanical pump 5 does not work. The electric pump 3 delivers oil to the first rotor 11, the second rotor 21, and the second stator 22 through the first oil supply assembly 4. The third pressure valve 61 blocks the oil driven by the electric pump 3 from being delivered to the second oil supply assembly 6.

[0044] 2. If Figure 3 As shown. The electric pump 3 and the mechanical pump 5 are working. The electric pump 3 delivers oil to the first rotor 11, the second rotor 21 and the second stator 22 through the first oil supply assembly 4. The mechanical pump 5 delivers oil to the first stator 12 through the second oil supply assembly 6, and at the same time delivers oil to the first rotor 11, the second rotor 21 and the second stator 22 through the third pressure valve 61 via the first oil supply assembly 4.

[0045] 3. If Figure 4 As shown. The mechanical pump 5 is working, and the electric pump 3 is not working. The mechanical pump 5 delivers oil to the first stator 12 through the second oil supply assembly 6. At the same time, the oil is delivered to the first rotor 11, the second rotor 21 and the second stator 22 through the third pressure valve 61 and the first oil supply assembly 4.

[0046] In the embodiment of the present application, the first pressure valve 41 may be a one-way valve.

[0047] In the embodiment of the present application, the second pressure valve 42 may be a one-way valve.

[0048] In the embodiment of the present application, the third pressure valve 61 may be a one-way valve.

[0049] In the embodiment of the present application, the hydraulic system may further include a shaft gear 9 and a clutch 7 , and the electric pump 3 delivers oil to the shaft gear 9 and the clutch 7 through the first oil supply assembly 4 .

[0050] In an embodiment of the present application, the hydraulic system may further include a cooling oil structure, which is connected to the electric pump 3 and the mechanical pump 5 respectively, and can cool the oil that completes the lubrication and cooling work, and transport it to the mechanical pump 5 and the electric pump 3.

[0051] In some of the embodiments of this application, Figure 1 As shown, the first oil supply assembly 4 includes a bypass valve 43 and an oil cooler 44 , the output end of the first oil supply assembly 4 and the electric pump 3 are respectively connected to the bypass valve 43 , and the output end of the first oil supply assembly 4 and the electric pump 3 are respectively connected to the oil cooler 44 .

[0052] It is understandable that the bypass valve 43 can maintain the oil supply to the first rotor 11, the second rotor 21 and the second stator 22, so as to maintain the lubrication and cooling effect on the above three. The oil cooler 44 can reduce the temperature of the oil passing through the bypass valve 43 to improve the cooling effect of the oil on the first rotor 11, the second rotor 21 and the second stator 22. Through the bypass valve 43 and the oil cooler 44, the first oil supply assembly 4 can achieve the lubrication and cooling effect on the first rotor 11, the second rotor 21 and the second stator 22.

[0053] In some of the embodiments of this application, Figure 1 As shown, the first oil supply assembly 4 also includes a first one-way valve 45 and a second one-way valve 46. The first one-way valve 45 connects the electric pump 3 and the bypass valve 43, and connects the electric pump 3 and the oil cooler 44. The second one-way valve 46 is connected to the bypass valve 43 and the oil cooler 44 respectively.

[0054] It is understandable that the first one-way valve 45 can reduce the situation where the oil liquid flows back into the electric pump 3 when the oil cooler 44 and the bypass valve 43 are blocked, thereby reducing the impact received by the electric pump 3. The second one-way valve 46 can block the oil liquid driven by the second oil supply assembly 6 from flowing back into the bypass valve 43 and the oil cooler 44, thereby improving the working independence between the first oil supply assembly 4 and the second oil supply assembly 6.

[0055] In some of the embodiments of this application, Figure 1As shown, the second oil supply assembly 6 includes a fourth pressure valve 62 and a regulating valve 63, the fourth pressure valve 62 and the regulating valve 63 are respectively connected to the mechanical pump 5, the fourth pressure valve 62 is used to deliver oil to the first stator 12, and the regulating valve 63 is connected to the fourth pressure valve 62 to control the opening of the fourth pressure valve 62.

[0056] It is understandable that the mechanical pump 5 can deliver oil to the first stator 12 through the fourth pressure valve 62, so as to lubricate and cool the first stator 12. The regulating valve 63 can adjust the oil volume of the second oil supply assembly 6 by adjusting the opening of the fourth pressure valve 62, so as to adapt it to the working condition of the first stator 12, thereby reducing the waste and energy consumption caused by lubricating and cooling the first stator 12 under other circumstances.

[0057] In some of the embodiments of this application, Figure 1 As shown, the hydraulic system includes a clutch 7 , and the second oil supply assembly 6 also includes a switch valve 64 , and the switch valve 64 connects the mechanical pump 5 and the clutch 7 .

[0058] It is understandable that the clutch 7 is generally used to achieve power transmission and interruption, and it generates a lot of heat during operation. The mechanical pump 5 and the clutch 7 are connected through the switch valve 64, and the mechanical pump 5 can deliver oil with sufficient pressure and flow to the clutch 7, so that the clutch 7 can be lubricated and cooled.

[0059] In the embodiment of the present application, the switch valve 64 may be a two-position three-way proportional valve.

[0060] In the embodiment of the present application, the hydraulic system may further include an accumulator, which is located between the clutch 7 and the switch valve 64 and is in communication with the switch valve 64. The accumulator may stabilize the oil pressure fluctuation of the clutch 7 and reduce the impact received by the clutch 7.

[0061] In some of the embodiments of this application, Figure 1 As shown, the hydraulic system includes a clutch 7 , and the first oil supply assembly 4 and the second oil supply assembly 6 are both connected to the clutch 7 .

[0062] It can be understood that, by connecting the clutch 7 via the first oil supply assembly 4 and the second oil supply assembly 6 , the hydraulic system of the present application can increase the oil supply to the clutch 7 , which is beneficial to improving the working condition of the clutch 7 .

[0063] In some of the embodiments of this application, Figure 1 As shown, the hydraulic system includes a pressure relief valve 8, which is located between the third pressure valve 61 and the second oil supply assembly 6, and is connected to the output ends of the third pressure valve 61 and the second oil supply assembly 6 respectively.

[0064] It can be understood that the pressure relief valve 8 can reduce the situation where the oil pressure generated by the second oil supply assembly 6 is too high and pushes open the third pressure valve 61, which is beneficial for guiding the excess oil generated by the second oil supply assembly 6 to other places, thereby facilitating the distribution of oil according to actual needs and reducing the impact on the first oil supply assembly 4.

[0065] In some embodiments of the present application, the ratio of the oil flow rate of the second stator 22 to the oil flow rate of the second rotor 21 is greater than or equal to 4:1.

[0066] It is understandable that the second stator 22 and the second rotor 21 are working parts of the drive motor 2, and both have a relatively long working time. The second stator 22 is lubricated with a larger oil flow rate, which is conducive to maintaining a relatively stable working state. At the same time, the second rotor 21 has a smaller oil flow rate, which is conducive to improving the rationality of oil distribution.

[0067] In the embodiment of the present application, the oil flow rate of the second stator 22 refers to the oil flow rate received by the second stator 22 when the second stator 22 and the second rotor 21 are lubricated at the same time.

[0068] In the embodiment of the present application, the oil flow rate of the second rotor 21 refers to the oil flow rate received by the second rotor 21 when the second stator 22 and the second rotor 21 are lubricated at the same time.

[0069] In some embodiments of the present application, the ratio of the oil flow rate of the first stator 12 to the oil flow rate of the first rotor 11 is greater than or equal to 4:1.

[0070] It is understandable that the first stator 12 and the first rotor 11 are working parts of the generator 1, and both have a short working time. The first stator 12 is lubricated with a large oil flow rate, which is conducive to maintaining a relatively stable working state. At the same time, the oil flow rate of the first rotor 11 is small, which is conducive to improving the rationality of oil distribution.

[0071] In the embodiment of the present application, the oil flow rate of the first stator 22 refers to the oil flow rate received by the first stator 22 when the first stator 22 and the first rotor 21 are lubricated at the same time.

[0072] In the embodiment of the present application, the oil flow rate of the first rotor 21 refers to the oil flow rate received by the first rotor 21 when the first stator 22 and the first rotor 21 are lubricated at the same time.

[0073] A second aspect of the present application provides a vehicle, which includes the hydraulic system described in the above embodiment.

[0074] It can be understood that, due to the adoption of the hydraulic system of the above embodiment, the automobile of the present application has the same technical effect as the above hydraulic system, which will not be described in detail here.

[0075] In the embodiment of the present application, the car may be a hybrid car.

[0076] In the embodiment of the present application, the automobile includes a clutch 7 and an engine, wherein the second oil supply assembly 6 can deliver oil to the clutch 7, and the engine is connected to the mechanical pump 5 in a transmission manner. The automobile has five modes, specifically including:

[0077] 1. Pure electric mode.

[0078] The electric pump 3 works, and the mechanical pump 5 does not work. The electric pump 3 delivers oil to the first rotor 11, the second rotor 21, the second stator 22 and the clutch 7 through the first oil supply assembly 4. The third pressure valve 61 blocks the oil driven by the electric pump 3 from being delivered to the second oil supply assembly 6.

[0079] 2. Series mode.

[0080] The electric pump 3 and the mechanical pump 5 work. The electric pump 3 delivers oil to the first rotor 11, the second rotor 21, the second stator 22 and the clutch 7 through the first oil supply assembly 4. The mechanical pump 5 delivers oil to the first stator 12 through the second oil supply assembly 6, and delivers oil to the first rotor 11, the second rotor 21, the second stator 22 and the clutch 7 through the first oil supply assembly 4 through the third pressure valve 61.

[0081] 3. Parallel mode.

[0082] The electric pump 3 and the mechanical pump 5 work. The electric pump 3 delivers oil to the first rotor 11, the second rotor 21, the second stator 22 and the clutch 7 through the first oil supply assembly 4. The mechanical pump 5 delivers oil to the first stator 12 through the second oil supply assembly 6, delivers oil to the first rotor 11, the second rotor 21, the second stator 22 and the clutch 7 through the third pressure valve 61 via the first oil supply assembly 4, and also delivers oil to the clutch 7 through the second oil supply assembly 6.

[0083] 4. Engine direct drive mode.

[0084] The mechanical pump 5 works, and the electric pump 3 does not work. The mechanical pump 5 delivers oil to the first stator 12 through the second oil supply assembly 6. At the same time, the oil is delivered to the first rotor 11, the second rotor 21, the second stator 22 and the clutch 7 through the third pressure valve 61 and the first oil supply assembly 4.

[0085] 5. Reverse mode.

[0086] The electric pump 3 works, and the mechanical pump 5 does not work. The electric pump 3 delivers oil to the first rotor 11, the second rotor 21, the second stator 22 and the clutch 7 through the first oil supply assembly 4. The third pressure valve 61 blocks the oil driven by the electric pump 3 from being delivered to the second oil supply assembly 6.

[0087] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0088] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0089] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A hydraulic system, characterized in that: The hydraulic system comprises a generator (1), a drive motor (2), an electric pump (3), a first oil supply component (4), a mechanical pump (5) and a second oil supply component (6), wherein: The generator (1) comprises a first rotor (11) and a first stator (12); The drive motor (2) comprises a second rotor (21) and a second stator (22); The electric pump (3) is used to transport oil to the first rotor (11), the second rotor (21) and the second stator (22) through the first oil supply assembly (4); The first oil supply assembly (4) is in communication with the first rotor (11) via a first pressure valve (41), and is in communication with the second rotor (21) via a second pressure valve (42); The mechanical pump (5) is used to transport oil to the first rotor (11), the second rotor (21), the second stator (22), the first stator (12) and the output end of the first oil supply assembly (4) through the second oil supply assembly (6); The output end of the second oil supply assembly (6) is unidirectionally connected to the output end of the first oil supply assembly (4) via a third pressure valve (61); The oil pressure at the output end of the first oil supply assembly (4) is lower than the oil pressure at the output end of the second oil supply assembly (6).

2. The hydraulic system according to claim 1, characterized in that: The first oil supply assembly (4) comprises a bypass valve (43) and an oil cooler (44); the output end of the first oil supply assembly (4) and the electric pump (3) are respectively connected to the bypass valve (43); the output end of the first oil supply assembly (4) and the electric pump (3) are respectively connected to the oil cooler (44).

3. The hydraulic system according to claim 2, characterized in that: The first oil supply assembly (4) further comprises a first one-way valve (45) and a second one-way valve (46), wherein the first one-way valve (45) is connected to the electric pump (3) and the bypass valve (43), and is connected to the electric pump (3) and the oil cooler (44), and the second one-way valve (46) is connected to the bypass valve (43) and the oil cooler (44) respectively.

4. The hydraulic system according to claim 1, characterized in that: The second oil supply assembly (6) comprises a fourth pressure valve (62) and a regulating valve (63), wherein the fourth pressure valve (62) and the regulating valve (63) are respectively connected to the mechanical pump (5), the fourth pressure valve (62) is used to deliver oil to the first stator (12), and the regulating valve (63) is connected to the fourth pressure valve (62) to control the opening of the fourth pressure valve (62).

5. The hydraulic system according to claim 1, characterized in that: The hydraulic system comprises a clutch (7), and the second oil supply assembly (6) further comprises a switch valve (64), wherein the switch valve (64) connects the mechanical pump (5) and the clutch (7).

6. The hydraulic system according to claim 1, characterized in that: The hydraulic system comprises a clutch (7), and the first oil supply assembly (4) and the second oil supply assembly (6) are both connected to the clutch (7).

7. The hydraulic system according to claim 1, characterized in that: The hydraulic system comprises a pressure relief valve (8), wherein the pressure relief valve (8) is located between the third pressure valve (61) and the second oil supply assembly (6), and is respectively connected to the output ends of the third pressure valve (61) and the second oil supply assembly (6).

8. The hydraulic system according to claim 1, characterized in that: The ratio of the oil flow rate of the second stator (22) to the oil flow rate of the second rotor (21) is greater than or equal to 4:

1.

9. The hydraulic system according to claim 1, characterized in that: The ratio of the oil flow rate of the first stator (12) to the oil flow rate of the first rotor (11) is greater than or equal to 4:

1.

10. An automobile, characterized in that: The vehicle comprises a hydraulic system as claimed in any one of claims 1 to 9.

Images