Oil supply system of electric drive assembly, electric drive assembly and vehicle

Abstract

The invention relates to an oil supply system of an electric drive assembly, the electric drive assembly and a vehicle, the oil supply system of the electric drive assembly comprises an oil pan and an oil supply mechanism, a shell oil pool, a first oil suction port and a second oil suction port are formed in the oil pan, the first oil suction port and the second oil suction port are connected with the shell oil pool, the oil supply mechanism comprises an oil supply pipeline and an oil supply pump, and the oil supply pump is arranged on the oil supply pipeline; the first end of the oil supply pipeline is used for being connected with the oil supply end of the electric drive assembly, the oil supply system comprises a first state and a second state, the first state corresponds to the first posture of the electric drive assembly, the second state corresponds to the second posture of the electric drive assembly, and in the first posture, the second end of the oil supply pipeline is connected with the first oil suction port; and in the second posture, the second end of the oil supply pipeline is connected with the second oil suction port, so that the oil supply pump pumps oil through the second oil suction port. In this way, the oil supply system can meet the requirement for active oil supply lubrication of the electric drive assembly in different postures.

Description

Technical Field

[0001] The present disclosure relates to the technical field of oil supply for electric drive axles, and in particular, to an oil supply system for an electric drive assembly, an electric drive assembly, and a vehicle. Background Art

[0002] The electric drive assembly of a vehicle is mostly arranged horizontally, and in order to improve driving efficiency, the amount of oil used to lubricate the electric drive assembly is relatively small. When encountering a large-angle climb, the oil level in the oil pan of the vehicle's electric drive assembly will tilt. When the oil suction port in the horizontal form tilts, there will be a temporary leakage of oil level, resulting in a lack of sufficient oil to lubricate the motor system and reducer system corresponding to the electric drive assembly when the vehicle is going uphill. Summary of the Invention

[0003] The purpose of the present disclosure is to provide an oil supply system for an electric drive assembly, an electric drive assembly and a vehicle. The oil supply system can selectively connect the oil supply pump to the corresponding first oil port or second oil port according to the first posture and the second posture of the electric drive assembly to supply oil and lubrication to the electric drive assembly, so as to at least partially solve the problems in the related art.

[0004] In order to overcome the problems existing in the related art, the first aspect of the embodiment of the present disclosure provides an oil supply system of an electric drive assembly, including: an oil pan, forming a shell oil pool and a first oil suction port and a second oil suction port connected to the shell oil pool, an oil supply mechanism, including an oil supply pipeline and an oil supply pump, the oil supply pump is arranged on the oil supply pipeline, the first end of the oil supply pipeline is used to connect the oil supply end of the electric drive assembly, and the opposite second end is connected to the first oil suction port and the second oil suction port respectively; the oil supply system includes a first state and a second state, the first state corresponds to the first posture of the electric drive assembly, and the second state corresponds to the second posture of the electric drive assembly; in the first state, the second end of the oil supply pipeline is connected to the first oil suction port, so that the oil supply pump draws oil through the first oil suction port, and in the second state, the second end of the oil supply pipeline is connected to the second oil suction port, so that the oil supply pump draws oil through the second oil suction port. In this way, in the first state, the second end of the oil supply pipeline is connected to the first oil suction port, so that the oil supply pump pumps oil through the first oil suction port. In the second state, the second end of the oil supply pipeline is connected to the second oil suction port, so that the oil supply pump pumps oil through the second oil suction port, thereby enabling the electric drive assembly to be actively lubricated in both the first state and the second state.

[0005] In some possible implementations, the first posture of the electric drive assembly is a horizontal vehicle driving state, and the second posture of the electric drive assembly is an uphill vehicle driving state. Thus, when the vehicle is in the horizontal vehicle driving state, the oil supply pump in the oil supply system of the electric drive assembly can actively lubricate the electric drive assembly by pumping oil through the first oil suction port. When the vehicle is in the uphill vehicle driving state, the oil supply pump in the oil supply system of the electric drive assembly can actively lubricate the electric drive assembly by pumping oil through the second oil suction port.

[0006] In some possible embodiments, in the first state, the first oil suction port is located below the oil level in the oil pan, and the second oil suction port is located above the oil level in the oil pan; and / or in the second state, the second oil suction port is located below the oil level in the oil pan, and the first oil suction port is located above the oil level in the oil pan. Thus, in the first state, the oil supply pump is connected to the first oil suction port so that the oil supply pump can pump oil through the first oil suction port to actively lubricate the electric drive assembly. In the second state, the oil supply pump is connected to the second oil suction port so that the oil supply pump can pump oil through the second oil suction port to actively lubricate the electric drive assembly.

[0007] In some possible implementations, in the first state, the first oil suction port is located at the lowest point of the oil sump, and / or in the second state, the second oil suction port is located at the lowest point of the oil sump. Thus, by limiting the position of the first oil suction port in the first state, the oil supply pump can easily draw oil from the housing oil sump in the first state, and by limiting the position of the second oil suction port in the second state, the oil supply pump can easily draw oil from the housing oil sump in the second state.

[0008] In some possible embodiments, the oil supply mechanism further includes an oil port switching mechanism, the oil port switching mechanism being disposed at the second end of the oil supply line, the oil port switching mechanism being configured to selectively connect the second end of the oil supply line to the first oil suction port or to the second oil suction port according to the first posture and the second posture of the electric drive assembly. In this way, the oil port switching mechanism enables the second end of the oil supply line to be selectively connected to the first oil suction port or the second oil suction port according to the first posture and the second posture of the electric drive assembly, so that in the first posture and the second posture, the oil supply pump can pump oil from the first oil suction port or from the second oil suction port to actively lubricate the electric drive assembly, that is, it can actively lubricate the electric drive assembly in the horizontal driving state of the vehicle or the uphill driving state of the vehicle.

[0009] In some possible embodiments, the oil port switching mechanism includes a controller and a two-position three-way solenoid valve, wherein a first opening of the two-position three-way solenoid valve is connected to the first oil suction port, a second opening of the two-position three-way solenoid valve is connected to the second oil suction port, and a third opening of the two-position three-way solenoid valve is connected to the oil supply pump; the controller is electrically connected to the two-position three-way solenoid valve, and the controller is used to control the movement of the valve core of the two-position three-way solenoid valve so that the third opening is selectively connected to the first opening or the second opening. In this way, the oil port switching mechanism includes a controller and a two-position three-way solenoid valve, and the controller controls the movement of the valve core of the two-position three-way solenoid valve so that the third opening of the two-position three-way solenoid valve is selectively connected to the first opening or the second opening. In a first state, the controller can control the third opening of the two-position three-way solenoid valve to connect to the first opening, thereby facilitating the oil supply pump to pump oil from the first oil suction port to actively lubricate the electric drive assembly. In a second state, the controller can control the third opening of the two-position three-way solenoid valve to connect to the second opening, thereby facilitating the oil supply pump to pump oil from the second oil suction port to actively lubricate the electric drive assembly.

[0010] In some possible implementations, the controller is configured to control the movement of the valve core of the two-position, three-way solenoid valve based on the vehicle's posture, selectively connecting the third opening to either the first opening or the second opening. In this way, the controller can identify the vehicle's state via the vehicle posture sensor to control the two-position, three-way solenoid valve to switch the oil supply system between the first and second states, thereby facilitating active lubrication of the electric drive assembly in either the first or second state.

[0011] In some possible embodiments, the oil port switching mechanism includes a pressure pump, a two-position three-way hydraulic valve and a hydraulic cylinder, the first oil opening of the two-position three-way hydraulic valve is connected to the first oil suction port, the second oil opening of the two-position three-way hydraulic valve is connected to the second oil suction port, the third oil opening of the two-position three-way hydraulic valve is connected to the oil supply pump, the inlet of the pressure pump is connected to the first oil suction port, and the outlet of the pressure pump is connected to the oil inlet of the hydraulic cylinder, so that the pressure pump is used to draw oil from the first oil suction port and place the oil into the hydraulic cylinder, thereby driving the piston rod of the hydraulic cylinder to push the valve core of the two-position three-way hydraulic valve to move so that the third oil opening is selectively connected to the first oil opening or the second oil opening. In this way, the oil port switching mechanism includes a pressure pump, a two-position three-way hydraulic valve and a hydraulic cylinder, which can actively switch the third oil opening of the two-position three-way hydraulic valve to connect to the first oil opening or to connect to the second oil opening according to the switching between the first state and the second state. In the first state, oil is pumped from the first oil suction port by the pressure pump so that the piston rod of the hydraulic cylinder pushes the valve core of the two-position three-way hydraulic valve to move, and the oil supply pump pumps oil from the first oil suction port to lubricate the electric drive assembly. In the second state, the pressure pump does not supply oil, so that the two-position three-way hydraulic valve is reset, and the oil supply pump pumps oil from the second oil suction port to lubricate the electric drive assembly.

[0012] In some possible embodiments, the output end of the piston rod of the hydraulic cylinder is connected to the valve core of the two-position three-way hydraulic valve, and a reset spring is sleeved on the outer periphery of the piston rod of the hydraulic cylinder. The reset spring is used to push the piston rod in reverse to return to its initial position. When the hydraulic cylinder is in the initial position, the third oil opening of the two-position three-way hydraulic valve is connected to the second oil opening. In this way, in the first state, the pressure pump draws oil from the first oil suction port to drive the piston rod of the hydraulic cylinder to push the valve core of the two-position three-way hydraulic valve to move, and gradually switches the connection between the third oil opening and the second oil opening in the initial state to the connection between the first oil rough port and the first oil opening, so that the oil supply pump can draw oil from the first oil suction port through the two-position three-way hydraulic valve to actively lubricate the electric drive assembly. In the second state, the first oil suction port is above the oil level. At this time, the pressure pump cannot supply oil to the hydraulic cylinder so that the hydraulic cylinder is reset to the initial state under the action of the return spring, so that the third oil opening of the two-position three-way hydraulic valve is switched from being connected to the first oil opening to being connected to the second oil opening, so that the oil supply pump draws oil from the second oil suction port through the two-position three-way hydraulic valve to actively lubricate the electric drive assembly.

[0013] In some possible embodiments, the oil port switching mechanism further includes a power assembly configured to drive the pressure pump and / or the oil supply pump. Thus, the power assembly can provide power to the pressure pump and / or the oil supply pump, so that the power assembly drives the pressure pump to pump oil from the first oil suction port, thereby driving the hydraulic cylinder to move the valve core of the two-position three-way hydraulic valve. The power assembly then drives the oil supply pump to pump oil from the first oil suction port or the second oil suction port through the two-position three-way hydraulic valve to actively lubricate the electric drive assembly.

[0014] In some possible embodiments, the power assembly includes a drive motor and a connecting shaft; the connecting shaft is respectively connected to the oil supply pump and the pressure pump, and the output end of the drive motor is connected to the connecting shaft. Thus, the drive motor drives the connecting shaft to rotate, thereby driving the oil supply pump and the pressure pump to operate synchronously, so that the pressure pump draws oil from the first oil suction port, driving the hydraulic cylinder to move the valve core of the two-position three-way hydraulic valve, and the oil supply pump draws oil from the first oil suction port or the second oil suction port through the two-position three-way hydraulic valve to actively lubricate the electric drive assembly.

[0015] In some possible embodiments, the oil port switching mechanism further includes a pressure reducing assembly connected to the oil chamber of the hydraulic cylinder and configured to control pressure relief when the oil pressure within the oil chamber exceeds a preset pressure. This pressure reducing assembly can thereby control the pressure within the hydraulic cylinder's oil chamber within a preset range, reducing the risk of hydraulic cylinder failure due to excessive oil chamber pressure.

[0016] In some possible implementations, the pressure reducing assembly is a pressure reducing valve or a relief valve. Thus, by using the pressure reducing assembly as a pressure reducing valve or a relief valve, the oil pressure in the oil chamber can be easily controlled.

[0017] In some possible implementations, the oil supply line includes a first branch and a second branch. The inlets of both the first and second branches are connected to the oil supply pump. The outlet of the first branch is connected to the oil supply port of the reducer system of the electric drive assembly, and the outlet of the second branch is connected to the oil supply ports of the motor system and reducer system of the electric drive assembly. In this way, by dividing the oil supply line into the first and second branches, oil lubrication of the reducer system or motor system of the electric drive assembly can be facilitated.

[0018] In some possible implementations, the oil supply mechanism further includes an oil filter, which is disposed in the oil supply pipeline and close to the outlet of the oil supply pump; and / or The oil supply mechanism also includes a suction filter, which is located at one end of the first oil suction port facing the housing oil sump, and at the other end of the second oil suction port facing the housing oil sump. The oil filter provides fine filtration of the high-pressure section, reducing the risk of impurities in the oil causing wear on the motor system or reducer system. The suction filter also provides coarse filtration of the low-pressure section, reducing the risk of impurities in the oil causing wear on the oil supply pump.

[0019] In some possible implementations, the oil supply mechanism further includes a heat exchanger disposed in the second branch, configured to reduce the temperature of the oil in the second branch. This lowers the temperature of the oil in the second branch, thereby simultaneously lubricating and cooling the motor system and reducer system of the electric drive assembly.

[0020] In some possible implementations, the second branch downstream of the heat exchanger forms a plurality of parallel sub-branches. In this way, the plurality of parallel sub-branches formed by the second branch can correspond to lubrication locations in the motor system and the reducer system, thereby achieving more precise lubrication.

[0021] A second aspect of the present disclosure provides an electric drive assembly, comprising a motor system, a reducer system, and the oil supply system of the above-mentioned electric drive assembly.

[0022] A third aspect of the present disclosure provides a vehicle comprising the above-mentioned electric drive assembly.

[0023] Through the above technical solution, the oil supply system includes an oil pan and an oil supply mechanism, the oil pan forms a shell oil pool, the oil pan is provided with a first oil suction port and a second oil suction port connected to the shell oil pool, the oil supply mechanism includes an oil supply pipeline and an oil supply pump, the oil supply pump is arranged on the oil supply pipeline, the first end of the oil supply pipeline is connected to the oil supply end of the electric drive assembly, the oil supply system includes a first state and a second state, in the first state, the second end of the oil supply pipeline is connected to the first oil suction port, at this time, the oil supply pump draws oil through the first oil suction port to supply oil to the electric drive assembly, in the second state, the second end of the oil supply pipeline is connected to the second oil suction port, at this time, the oil supply pump draws oil through the second oil suction port to supply oil to the electric drive assembly. For example, the first state corresponds to the first posture of the electric drive assembly, and the second state corresponds to the second posture of the electric drive assembly. The first posture is the state of the vehicle driving horizontally, and the second posture is the state of the vehicle driving uphill. In this way, when the vehicle is driving horizontally and uphill, the oil supply pump can supply oil to the electric drive assembly through the first oil suction port or the second oil suction port respectively, thereby meeting the lubrication of the vehicle's electric drive assembly in both states.

[0024] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure.

[0026] Figure 1 3 is a schematic cross-sectional view of the electric drive assembly provided in an exemplary embodiment of the present disclosure in a first posture.

[0027] Figure 2 3 is a schematic cross-sectional view of the electric drive assembly provided in an exemplary embodiment of the present disclosure in a second posture.

[0028] Figure 3 is a schematic diagram of a first oil supply system provided in an exemplary embodiment of the present disclosure.

[0029] Figure 4 is a schematic diagram of a second oil supply system provided in an exemplary embodiment of the present disclosure.

[0030] Figure 5 1 is a schematic diagram of a vehicle starting state under a horizontal working condition of a second oil supply system provided in an exemplary embodiment of the present disclosure.

[0031] Figure 6 1 is a schematic diagram of a second fuel supply system provided in an exemplary embodiment of the present disclosure in a stable vehicle state under horizontal working conditions.

[0032] Figure 7 2 is a schematic diagram of the switching state of the second oil supply system provided in an exemplary embodiment of the present disclosure under an uphill attitude condition.

[0033] Figure 8 A schematic diagram of a second fuel supply system in a stable state under an uphill attitude condition provided in an exemplary embodiment of the present disclosure.

[0034] Description of Reference Numerals 1-Oil pan; 11-Casing oil pool; 12-First oil suction port; 13-Second oil suction port; 2-Oil supply mechanism; 21-Oil supply pipeline; 22-Oil supply pump; 23-First branch; 24-Second branch; 25-Sub-branch; 3-Oil port switching mechanism; 4-Controller; 5-Two-position three-way solenoid valve; 6-Pressure pump; 7-Two-position three-way hydraulic valve; 8-Hydraulic cylinder; 81-Piston rod; 82-Return spring; 83-Oil chamber; 9-Power assembly; 91-Drive motor; 92-Connecting shaft; 10-Pressure reduction assembly; 100-Oil filter; 110-Suction filter; 120-Heat exchanger; 130-Motor system; 140-Reducer system. DETAILED DESCRIPTION

[0035] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0036] In this disclosure, unless otherwise stated, directional words such as "upper" and "lower" generally refer to the upper and lower parts of the corresponding drawings. Figure 1 The X-direction. "Inner" and "outer" refer to the contours of the component itself. Furthermore, it should be noted that the use of terms such as "first" and "second" is intended to distinguish one element from another and does not imply order or importance. Furthermore, in the description with reference to the accompanying drawings, the same reference numerals in different drawings represent the same element.

[0037] The inventors have discovered that the electric drive assembly of a vehicle is mostly arranged horizontally, and in order to improve driving efficiency, the amount of oil used to lubricate the electric drive assembly is relatively small. When encountering a large-angle climb, the oil level in the oil pan of the vehicle's electric drive assembly will tilt. When the oil suction port in the horizontal form tilts, there will be a temporary leakage of oil level, resulting in insufficient oil to lubricate the motor system and reducer system corresponding to the electric drive assembly when the vehicle is going uphill.

[0038] In order to solve the above technical problems, Figures 1-8 As shown, in the first aspect of the embodiment of the present disclosure, an oil supply system of an electric drive assembly is provided, comprising: an oil pan 1 and an oil supply mechanism 2, the oil pan 1 is formed with a shell oil pool 11 and a first oil suction port 12 and a second oil suction port 13 connected to the shell oil pool 11, the oil supply mechanism 2 comprises an oil supply pipeline 21 and an oil supply pump 22, the oil supply pump 22 is arranged on the oil supply pipeline 21, the first end of the oil supply pipeline 21 is used to connect the oil supply end of the electric drive assembly, and the opposite second end is connected to the first oil suction port 12 and the second oil suction port 13 respectively; the oil supply system comprises a first state and a second state, the first state corresponds to the first posture of the electric drive assembly, and the second state corresponds to the second posture of the electric drive assembly; in the first state, the second end of the oil supply pipeline 21 is connected to the first oil suction port 12, so that the oil supply pump 22 pumps oil through the first oil suction port 12, and in the second state, the second end of the oil supply pipeline 21 is connected to the second oil suction port 13, so that the oil supply pump 22 pumps oil through the second oil suction port 13.

[0039] Through the above technical scheme, the oil supply system includes an oil pan 1 and an oil supply mechanism 2, the oil pan 1 forms a shell oil pool 11, and the oil pan 1 is provided with a first oil suction port 12 and a second oil suction port 13 connected to the shell oil pool 11, the oil supply mechanism 2 includes an oil supply pipeline 21 and an oil supply pump 22, the oil supply pump 22 is arranged on the oil supply pipeline 21, and the first end of the oil supply pipeline 21 is connected to the oil supply end of the electric drive assembly. The oil supply system includes a first state and a second state, the first state corresponds to the first posture of the electric drive assembly, and the second state corresponds to the second posture of the electric drive assembly. In the first posture of the electric drive assembly, the second end of the oil supply pipeline 21 is connected to the first oil suction port 12. At this time, the oil supply pump 22 draws oil through the first oil suction port 12 to supply oil to the electric drive assembly. In the second posture of the electric drive assembly, the second end of the oil supply pipeline 21 is connected to the second oil suction port 13. At this time, the oil supply pump 22 draws oil through the second oil suction port 13 to supply oil and lubrication to the electric drive assembly. For example, in some feasible embodiments, the first posture is a state in which the vehicle is traveling horizontally, and the second posture is a state in which the vehicle is traveling uphill. In this way, when the vehicle is traveling horizontally and uphill, the oil supply pump 22 can supply oil to the electric drive assembly through the first oil suction port 12 or the second oil suction port 13, respectively, to meet the lubrication requirements of the vehicle's electric drive assembly in both states.

[0040] It should be noted that the first posture of the electric drive assembly mentioned in this embodiment is the state of the vehicle traveling horizontally, and the second posture of the electric drive assembly is the state of the vehicle traveling uphill, wherein the slope of the uphill state can be greater than 30°.

[0041] It can be understood that the embodiment in which the first oil suction port 12 and the second oil suction port 13 are provided on the above-mentioned oil pan 1 is schematic. In other embodiments, a third oil suction port or a fourth oil suction port can be provided at other positions, wherein the third oil suction port can adapt to the left tilt state of the vehicle, and the fourth oil suction port can be suitable for the right tilt state of the vehicle. In this way, the first oil suction port 12, the second oil suction port 13, the third oil suction port or the fourth oil suction port can be selectively connected to the oil supply pump 22, so that the oil supply pump 22 can actively supply oil and lubricate the electric drive assembly according to different postures of the vehicle.

[0042] In some possible implementations, in the first state, the first oil suction port 12 is located below the oil level of the oil pan 1, and the second oil suction port 13 is located above the oil level of the oil pan 1; and / or in the second state, the second oil suction port 13 is located below the oil level of the oil pan 1, and the first oil suction port 12 is located above the oil level of the oil pan 1. Figure 1As shown, the oil supply system is in the first state. At this time, the oil level of the oil pan 1 is shown as L in the figure. The first oil suction port 12 is located below the oil level L of the oil pan 1, and the second oil suction port 13 is located above the oil level L of the oil pan 1. In this way, in the first state, the oil supply pump 22 is connected to the first oil suction port 12, and the oil supply pump 22 can extract the oil of the oil pan 1 through the first oil suction port 12 to actively lubricate the electric drive assembly; Figure 2 As shown, when the oil supply system is in the second state, the oil level of the oil pan 1 is shown as L in the figure, the second oil suction port 13 is located below the oil level L of the oil pan 1, and the first oil suction port 12 is located above the oil level L of the oil pan 1. In this way, in the first state, the oil supply pump 22 is connected to the second oil suction port 13, and the oil supply pump 22 can draw oil from the oil pan 1 through the second oil suction port 13 to actively lubricate the electric drive assembly.

[0043] In some possible embodiments, in the first state, the first oil suction port 12 is located at the lowest point of the oil pan 1, and / or in the second state, the second oil suction port 13 is located at the lowest point of the oil pan 1. For example, in the first state, the first oil suction port 12 is located at the lowest point of the oil pan 1 so that the oil supply line 21 can be as far away from the oil level L as possible. In the first state, sufficient oil can be pumped out by the oil supply pump 22 through the first oil suction port 12 to actively lubricate the electric drive assembly. Of course, in the second state, the second oil suction port 13 can also be located at the lowest point of the oil pan 1 so that the oil supply line 21 can be as far away from the oil level L as possible. In the second state, sufficient oil can be pumped out by the oil supply pump 22 through the second oil suction port 13 to actively lubricate the electric drive assembly.

[0044] It is understandable that the first oil suction port 12 in the first state is located at the lowest point of the oil pan 1 for schematic purposes. In other embodiments, the first oil suction port 12 can be located approximately at the lowest point. A drain bolt is usually provided at the bottom of the shell oil pool 11. The drain bolt is removably and sealedly connected to the bottom of the shell oil pool 11. For example, it can be sealed and connected to the drain hole at the bottom of the oil pan 1. By removing the drain bolt, oil change and maintenance are convenient. At this time, the first oil suction port 12 can be located above the drain bolt. In the second state, the second oil suction port 13 is located at the lowest point of the oil pan 1 for schematic purposes. In other embodiments, in the second state, the second oil suction port 13 can be located approximately at the lowest point, as long as it can be satisfied that in the second state, there is enough oil that can be pumped out by the oil supply pump 22 to actively lubricate the electric drive assembly.

[0045] In some possible implementations, in order to facilitate the oil supply pump 22 to be selectively connected to the first oil suction port 12 or the second oil suction port 13, as shown in FIG. Figure 3-Figure 8As shown, the oil supply mechanism 2 may further include an oil port switching mechanism 3, which is provided at the second end of the oil supply line 21. The oil port switching mechanism 3 is configured to selectively connect the second end of the oil supply line 21 to the first oil suction port 12 or to the second oil suction port 13 according to the first posture and the second posture of the electric drive assembly. In this way, the oil port switching mechanism 3 can realize that the second end of the oil supply line 21 is selectively connected to the first oil suction port 12 or the second oil suction port 13 according to the first posture and the second posture of the electric drive assembly, so that when the electric drive assembly is in the first posture or the second posture, the oil supply pump 22 can selectively pump oil from the first oil suction port 12 or from the second oil suction port 13 through the oil port switching mechanism 3 to actively lubricate the electric drive assembly.

[0046] In some possible implementations, such as Figure 3 As shown, the oil port switching mechanism 3 includes a controller 4 and a two-position three-way solenoid valve 5. The first opening of the two-position three-way solenoid valve 5 is connected to the first oil suction port 12 through an oil pipe, the second opening of the two-position three-way solenoid valve 5 is connected to the second oil suction port 13 through an oil pipe, and the third opening of the two-position three-way solenoid valve 5 is connected to the oil supply pump 22 through an oil pipe. The controller 4 is electrically connected to the two-position three-way solenoid valve 5. The controller 4 is used to control the movement of the valve core of the two-position three-way solenoid valve 5 so that the third opening is selectively connected to the first opening or the second opening. In this way, the oil port switching mechanism 3 includes a controller 4 and a two-position three-way solenoid valve 5. The controller 4 controls the movement of the valve core of the two-position three-way solenoid valve 5 so that the third opening of the two-position three-way solenoid valve 5 is selectively connected to the first opening or the second opening. Therefore, in the first state, the controller 4 can control the third opening of the two-position three-way solenoid valve 5 to be connected to the first opening, so that the oil supply pump 22 can draw oil from the first oil suction port 12 to actively lubricate the electric drive assembly. In the second state, the controller 4 can control the third opening of the two-position three-way solenoid valve 5 to be connected to the second opening, so that the oil supply pump 22 can draw oil from the second oil suction port 13 to actively lubricate the electric drive assembly.

[0047] In some embodiments, in order to facilitate the control of switching between the first and second states of the oil supply system, the controller 4 can be configured to control the movement of the valve core of the two-position three-way solenoid valve 5 according to the vehicle posture so that the third opening is selectively connected to the first opening or the second opening. The vehicle posture can be obtained by the vehicle recognition posture sensor, that is, when the vehicle is driving, the vehicle recognition posture sensor obtains that the vehicle is driving horizontally, that is, the oil supply system is in the first state, the controller 4 controls the two-position three-way solenoid valve 5 according to the result of the vehicle driving horizontally. At this time, the third opening of the two-position three-way solenoid valve 5 is connected to the first opening, so that the oil supply pump 22 can draw oil from the first oil suction port 12 through the two-position three-way solenoid valve 5 to actively lubricate the electric drive assembly; when the vehicle is driving, the vehicle recognition posture sensor obtains that the vehicle is driving uphill, that is, the oil supply system is in the second state, the controller 4 controls the two-position three-way solenoid valve 5 according to the result of the vehicle uphill driving state. At this time, the third opening of the two-position three-way solenoid valve 5 is switched from being connected to the first opening to being connected to the second opening, thereby switching from the first state to the second state. In the second state, the oil supply pump 22 draws oil from the second oil suction port 13 through the two-position three-way solenoid valve 5 to actively lubricate the electric drive assembly.

[0048] It should be noted that the controller 4 can be any one of the vehicle's electronic control unit (ECU), PLC controller or single-chip microcomputer. In this embodiment, the controller 4 can be the vehicle's electronic control unit, which is respectively connected to the two-position three-way solenoid valve 5 and the vehicle identification posture sensor. The above-mentioned vehicle identification posture sensor can be an acceleration sensor, a slope sensor or a wheel speed sensor. In this embodiment, the vehicle identification posture sensor can be an acceleration sensor, which identifies the vehicle's driving state through the acceleration sensor. The vehicle's acceleration sensor is used to detect vehicle operating states such as acceleration, deceleration, tilt, vibration, etc. The vehicle's electronic control unit can control the two-position three-way solenoid valve 5 based on the result of the acceleration sensor. When the vehicle is in a horizontal driving state, the third opening of the two-position three-way solenoid valve 5 is controlled to be connected to the first opening, thereby facilitating the oil supply pump 22 to pump oil from the first oil suction port 12 to actively lubricate the electric drive assembly. When the vehicle is in an uphill driving state, the third opening of the two-position three-way solenoid valve 5 is controlled to be connected to the second opening, thereby facilitating the oil supply pump 22 to pump oil from the second oil suction port 13 to actively lubricate the electric drive assembly.

[0049] It is understandable that, in addition to passively controlling the two-position three-way solenoid valve 5 based on the results of the vehicle recognition posture sensor, the controller 4 can also be actively controlled manually. For example, the operator can send a control instruction to the controller 4, and the controller 4 controls the two-position three-way solenoid valve 5 to switch the third opening to the first opening or the second opening. The operator's instruction can be issued from the central control screen, a physical button, or an application of an electronic device (mobile phone, tablet), etc. When a physical button is provided in the vehicle, the physical button is configured to trigger the controller 4 to actively control the two-position three-way solenoid valve 5 to switch the third opening to the first opening or the second opening. When the driver observes the road conditions and the vehicle needs to go uphill, the driver can press the physical button to actively control the third opening of the two-position three-way solenoid valve 5 to switch from being connected to the first opening to being connected to the second opening, so that the oil supply pump 22 can pump oil from the second oil suction port 13 to actively lubricate the electric drive assembly.

[0050] In addition, in some possible implementations, such as Figure 4-Figure 8 As shown, the oil port switching mechanism 3 includes a pressure pump 6, a two-position three-way hydraulic valve 7 and a hydraulic cylinder 8. The first oil opening of the two-position three-way hydraulic valve 7 is connected to the first oil suction port 12 through an oil pipe, the second oil opening of the two-position three-way hydraulic valve 7 is connected to the second oil suction port 13 through an oil pipe, and the third oil opening of the two-position three-way hydraulic valve 7 is connected to the oil supply pump 22 through an oil pipe. The inlet of the pressure pump 6 is connected to the first oil suction port 12, and the outlet of the pressure pump 6 is connected to the oil inlet of the hydraulic cylinder 8, so that the pressure pump 6 is used to pump oil from the first oil suction port 12 and place the oil into the hydraulic cylinder 8, and then drive the piston rod 81 of the hydraulic cylinder 8 to push the valve core of the two-position three-way hydraulic valve 7 to move so that the third oil opening is selectively connected to the first oil opening or the second oil opening. In this way, the oil port switching mechanism 3 includes a pressure pump 6, a two-position three-way hydraulic valve 7 and a hydraulic cylinder 8, which can actively switch the third oil opening of the two-position three-way hydraulic valve 7 to connect to the first oil opening or to the second oil opening according to the vehicle's driving state. When the vehicle is in a horizontal driving state, that is, the electric drive assembly is in a first posture, the pressure pump 6 draws oil from the first oil suction port 12 so that the piston rod 81 of the hydraulic cylinder 8 pushes the valve core of the two-position three-way hydraulic valve 7 to move, and the oil supply pump 22 draws oil from the first oil suction port 12 to lubricate the electric drive assembly. When the vehicle is driving uphill, that is, the electric drive assembly is in a second posture, at this time, the first oil suction port 12 is above the oil level, and the pressure pump 6 cannot draw oil from the first oil suction port 12. At this time, the hydraulic cylinder 8 cannot obtain enough oil to drive the piston rod 81 to push the valve core of the two-position three-way hydraulic valve 7 to move, thereby resetting the two-position three-way hydraulic valve. At this time, the oil supply pump 22 draws oil from the second oil suction port 13 to lubricate the electric drive assembly.

[0051] In some possible embodiments, in order to facilitate the active resetting of the hydraulic cylinder 8 after it is out of oil, the output end of the piston rod 81 of the hydraulic cylinder 8 is connected to the valve core of the two-position three-way hydraulic valve 7, and a reset spring 82 is sleeved on the outer periphery of the piston rod 81 of the hydraulic cylinder 8. The reset spring 82 is used to push the piston rod 81 in the reverse direction to reset it to the initial position. When the hydraulic cylinder 8 is in the initial position, the third oil opening of the two-position three-way hydraulic valve 7 is connected to the second oil opening. For example, when the vehicle is traveling horizontally, that is, the electric drive assembly is in the first posture, the pressure pump 6 draws oil from the first oil suction port 12 to drive the piston rod 81 of the hydraulic cylinder 8 to push the valve core of the two-position three-way hydraulic valve 7 to move, and gradually switches the third oil opening in the initial state to the second oil opening to the third oil opening to the first oil opening, so that the oil supply pump 22 can draw oil from the first oil suction port 12 through the two-position three-way hydraulic valve 7 to actively lubricate the electric drive assembly. When the vehicle is traveling uphill, that is, the electric drive assembly is in the second posture, the first oil suction port 12 is above the oil level. At this time, the pressure pump 6 cannot supply oil to the hydraulic cylinder 8 so that the hydraulic cylinder 8 is reset to the initial state under the action of the return spring 82, so that the third oil opening of the two-position three-way hydraulic valve 7 is switched from being connected to the first oil opening to being connected to the second oil opening, so that the oil supply pump 22 draws oil from the second oil suction port 13 through the two-position three-way hydraulic valve 7 to actively lubricate the electric drive assembly.

[0052] In some possible embodiments, in order to facilitate the driving of the pressure pump 6 and / or the oil supply pump 22, the oil port switching mechanism 3 may further include a power assembly 9, which is used to drive the pressure pump 6 and / or the oil supply pump 22. For example, the pressure pump 6 and the oil supply pump 22 may be respectively provided with corresponding power assemblies 9 to drive them. In this way, when it is necessary to drive the pressure pump 6 and the oil supply pump 22, the corresponding power assemblies 9 may be started respectively. Of course, the pressure pump 6 and the oil supply pump 22 may also share a power assembly 9, which is used to drive the pressure pump 6 and the oil supply pump 22 to work synchronously at the same time through the power assembly 9, so that the power assembly 9 drives the pressure pump 6 to pump oil from the first oil suction port 12 to drive the hydraulic cylinder 8 to push the valve core of the two-position three-way hydraulic valve 7 to move, and the power assembly 9 drives the oil supply pump 22 to pump oil from the first oil suction port 12 or the second oil suction port 13 through the two-position three-way hydraulic valve 7 to actively lubricate the electric drive assembly.

[0053] In some possible embodiments, the power assembly 9 includes a drive motor 91 and a connecting shaft 92; the connecting shaft 92 is respectively connected to the oil supply pump 22 and the pressure pump 6, and the output end of the drive motor 91 is connected to the connecting shaft 92. Thus, the drive motor 91 drives the connecting shaft 92 to rotate, thereby driving the oil supply pump 22 and the pressure pump 6 to operate synchronously, so that the pressure pump 6 draws oil from the first oil suction port 12 to drive the hydraulic cylinder 8 to move the valve core of the two-position three-way hydraulic valve 7. The oil supply pump 22 draws oil from the first oil suction port 12 or the second oil suction port 13 through the two-position three-way hydraulic valve 7 to actively lubricate the electric drive assembly.

[0054] In some possible embodiments, the oil port switching mechanism 3 further includes a pressure reducing assembly 10, which is connected to the oil chamber 83 of the hydraulic cylinder 8 and is configured to control the pressure relief when the oil pressure in the oil chamber 83 exceeds a preset pressure. For example, the pressure reducing assembly 10 may be a pressure reducing valve or a relief valve. By configuring the pressure reducing valve or relief valve, the pressure in the oil chamber 83 of the hydraulic cylinder 8 can be controlled within a preset range, thereby reducing the risk of failure of the hydraulic cylinder 8 due to excessive pressure in the oil chamber 83.

[0055] In some possible embodiments, the oil supply line 21 includes a first branch 23 and a second branch 24. The inlets of the first branch 23 and the second branch 24 are both connected to the oil pump 22. The outlet of the first branch 23 is connected to the oil supply end of the reducer system of the electric drive assembly, and the outlet of the second branch 24 is connected to the oil supply end of the motor system and reducer system of the electric drive assembly. In this way, by dividing the oil supply line into the first branch 23 and the second branch 24, two separate lubrication lines are formed to respectively supply oil and lubricate the reducer system or the motor system of the electric drive assembly.

[0056] In some possible embodiments, the oil supply mechanism 2 further includes a heat exchanger 120, disposed in the second branch 24. Heat exchanger 120 is configured to reduce the temperature of the oil in the second branch 24. Heat exchanger 120 may be a cooler, which can lower the temperature of the oil in the second branch. This allows the oil flowing through second branch 24 to both lubricate and cool the motor system and reducer system of the electric drive assembly. It is understood that the cooler may be conventional, and the specific structure will not be described in detail herein.

[0057] In some possible embodiments, the second branch 24 located downstream of the heat exchanger 120 forms a plurality of parallel sub-branches 25. In this way, the plurality of parallel sub-branches formed by the second branch can correspond to the lubrication locations in the motor system and the reducer system, thereby achieving more precise lubrication. For example, the motor system may include a motor stator, a motor stator oil ring, a motor rotor, and a motor tail end bearing, and the reducer system may include gears, gear bearings, and a differential. The first branch 23 is connected to the oil supply end of the differential, and the oil from the oil supply pump 22 lubricates the differential through the first branch 23. Of course, in order to facilitate adjustment of the flow rate and pressure in the first branch 23, a throttle valve may also be provided at the outlet of the first branch 23. The second branch 24 located downstream of the heat exchanger 120 can form a plurality of parallel sub-branches 25. There can be five sub-branches 25, corresponding to the motor tail end bearing, motor rotor, motor stator and motor stator oil ring, gears and bearings, respectively. Thus, through the setting of the five sub-branches 25, the motor tail end bearing, motor rotor, motor stator and motor stator oil ring, gears and bearings can be lubricated with oil more accurately. In addition, after the second branch 24 is cooled by heat exchange through the heat exchanger 120, the oil can also cool the motor tail end bearing, motor rotor, motor stator and motor stator oil ring, gears and bearings.

[0058] In some possible embodiments, the oil supply mechanism 2 further includes an oil filter 100, which is disposed on the oil supply line 21 near the outlet of the oil supply pump 22; and / or the oil supply mechanism 2 further includes a suction filter 110, which is disposed at one end of the first oil suction port 12 facing the housing oil pool 11 and at one end of the second oil suction port 13 facing the housing oil pool 11. Thus, by disposing an oil filter on the oil supply line 21 near the outlet of the oil supply pump 22, fine filtration can be performed on the high-pressure section, reducing the risk of impurities in the oil causing wear on the motor system or reducer system. By disposing a suction filter at one end of the first oil suction port 12 facing the housing oil pool 11 and at one end of the second oil suction port 13 facing the housing oil pool 11, coarse filtration can be performed on the low-pressure section, reducing the risk of impurities in the oil causing wear on the oil supply pump.

[0059] like Figure 4-Figure 8 As shown, the present disclosure will specifically explain the process of switching the vehicle from a horizontal driving state to an uphill driving state using the structure of the oil port switching mechanism 3 including a pressure pump 6, a two-position three-way hydraulic valve 7 and a hydraulic cylinder 8, as follows: like Figure 5As shown, when the vehicle is in a horizontal working condition and the vehicle is started, the oil supply system is stationary and not started, the pressure pump 6 is connected to the first oil suction port 12, and the oil supply pump 22 is connected to the second oil suction port 13 through the two-position three-way hydraulic valve 7. When the vehicle is started in a horizontal working condition, the pressure pump 6 and the oil supply pump 22 are started at the same time. At this time, the oil level is L, the second oil suction port 13 is above the oil level L, no oil is sucked by the oil supply pump 22, the first oil suction port 12 is below the oil level L and is at the lowest point, the pressure pump 6 can draw oil from the first oil suction port 12 and deliver the oil to the oil chamber 83 of the hydraulic cylinder 8 to drive the piston rod 81 of the hydraulic cylinder 8 to move, and the piston rod 81 pushes the valve core of the two-position three-way hydraulic valve 7 to move, thereby gradually switching the oil supply pump 22 from being connected to the second oil suction port 13 to being connected to the first oil suction port 12, so that the oil supply pump 22 can gradually and normally supply oil to actively lubricate the electric drive assembly when the vehicle is in a horizontal working condition.

[0060] like Figure 6 As shown, when the vehicle is in a stable state under horizontal posture conditions, that is, the oil extracted by the pressure pump 6 from the first oil suction port 12 pushes the valve core stroke of the two-position three-way hydraulic valve 7 into place through the hydraulic cylinder 8. At this time, the oil supply pump 22 is completely switched from being connected to the second oil suction port 13 to being connected to the first oil suction port 12, and the oil supply pressure of the pressure pump 6 continues to increase, reaching the opening condition of the pressure relief valve. The oil extracted by the pressure pump 6 from the first oil suction port 12 is discharged from the pressure relief valve, thereby maintaining the third oil opening in the two-position three-way hydraulic valve 7 connected to the first oil opening, so that the oil supply pump 22 can continue to pump oil from the first oil suction port 12 through the two-position three-way hydraulic valve 7 to actively lubricate the electric drive assembly.

[0061] like Figure 7 As shown, when the vehicle switches states under an uphill posture, that is, the oil pumped by the pressure pump 6 from the first oil suction port 12 gradually decreases until the first oil suction port 12 is completely above the oil level L, at this time, as the oil inlet amount into the hydraulic cylinder 8 decreases, the piston rod 81 of the hydraulic cylinder 8 is gradually reset under the action of the reset spring 82, thereby driving the two-position three-way hydraulic valve 7 to gradually switch from the third oil opening and the first oil opening to the third oil opening and the second oil opening, so that when the vehicle gradually turns from a horizontal posture to an uphill posture, the oil supply pump 22 can have enough oil to actively lubricate the electric drive assembly.

[0062] like Figure 8 As shown, when the vehicle is in a stable state under an uphill posture condition, that is, the first oil opening is completely above the oil level L, the hydraulic cylinder 8 is reset to the initial state, and the third oil opening in the two-position three-way hydraulic valve 7 is connected to the second oil opening, so that under the uphill posture condition, the oil supply pump 22 can stably pump oil from the second oil suction port 13 to actively lubricate the electric drive assembly.

[0063] A second aspect of the present disclosure provides an electric drive assembly, comprising a motor system, a reducer system, and the aforementioned oil supply system for the electric drive assembly. The electric drive assembly includes all the beneficial effects of the aforementioned oil supply system for the electric drive assembly, which will not be further elaborated here.

[0064] It can be understood that in addition to the above-mentioned oil supply system, the electric drive system is also provided with an oil return system used in conjunction with the oil supply system. That is, after the oil lubricates the motor system or the reducer system through the oil supply system, the oil will flow back to the shell oil pool 11 in the oil pan 1 along the return line or return channel of the oil return system, thereby recycling the oil.

[0065] A third aspect of the present disclosure provides a vehicle including the aforementioned electric drive assembly. The vehicle includes all the beneficial effects of the aforementioned electric drive assembly, which will not be further elaborated here.

[0066] It is worth noting that the vehicle can be a pure electric vehicle or a hybrid vehicle. The electric drive assembly includes at least a motor system 130, a speed reducer, and a controller, but is not limited to a three-in-one electric drive assembly.

[0067] The oil supply system, electric drive assembly, and vehicle of the present disclosure are used to supply oil to the motor system 130 and the reducer system 140 of the electric drive assembly. The oil supply pump 22 of the oil supply mechanism supplies oil from the shell oil pool 11 of the oil pan 1 to the motor system 130 and the reducer system 140 through the oil supply pipeline 21 to achieve active oil supply and lubrication of the electric drive assembly. When the vehicle is traveling in a horizontal state, the oil supply pump 22 is connected to the first oil suction port 12 through the oil port switching mechanism 3 so that the oil supply pump 22 pumps oil from the first oil suction port 12 to lubricate the motor system 130 and the reducer system 140. When the vehicle is traveling in an uphill state, the oil supply pump 22 is connected to the second oil suction port 13 through the oil port switching mechanism 3 so that the oil supply pump 22 pumps oil from the second oil suction port 13 to lubricate the motor system 130 and the reducer system 140.

[0068] Of course, when the vehicle is traveling downhill, some components of the motor system 130 and the reducer system 140 will be immersed in the oil, for example, the main reduction gear and the differential will be immersed in the oil to achieve splash lubrication.

[0069] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0070] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0071] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An oil supply system for an electric drive assembly, characterized in that: include: The oil pan is formed with a shell oil pool and a first oil suction port and a second oil suction port connected to the shell oil pool. An oil supply mechanism includes an oil supply pipeline and an oil supply pump, wherein the oil supply pump is provided in the oil supply pipeline, a first end of the oil supply pipeline is used to connect to the oil supply end of the electric drive assembly, and an opposite second end of the oil supply pipeline is respectively connected to the first oil suction port and the second oil suction port; The oil supply system includes a first state and a second state, the first state corresponds to a first posture of the electric drive assembly, and the second state corresponds to a second posture of the electric drive assembly; In the first state, the second end of the oil supply pipeline is connected to the first oil suction port so that the oil supply pump pumps oil through the first oil suction port. In the second state, the second end of the oil supply pipeline is connected to the second oil suction port so that the oil supply pump pumps oil through the second oil suction port.

2. The oil supply system of the electric drive assembly according to claim 1, characterized in that: The first posture of the electric drive assembly is a state in which the vehicle is traveling horizontally, and the second posture of the electric drive assembly is a state in which the vehicle is traveling uphill.

3. The oil supply system of the electric drive assembly according to claim 2, characterized in that: In the first state, the first oil suction port is located below the oil level of the oil pan, and the second oil suction port is located above the oil level of the oil pan; and / or In the second state, the second oil suction port is located below the oil level of the oil pan, and the first oil suction port is located above the oil level of the oil pan.

4. The oil supply system of the electric drive assembly according to claim 3, characterized in that: In the first state, the first oil suction port is located at the lowest point of the oil pan; and / or In the second state, the second oil suction port is located at the lowest point of the oil pan.

5. The oil supply system of the electric drive assembly according to claim 2, characterized in that: The oil supply mechanism also includes an oil port switching mechanism, which is arranged at the second end of the oil supply pipeline. The oil port switching mechanism is configured to selectively connect the second end of the oil supply pipeline to the first oil suction port or the second oil suction port according to the first posture and the second posture of the electric drive assembly.

6. The oil supply system of the electric drive assembly according to claim 5, characterized in that: The oil port switching mechanism includes a controller and a two-position three-way solenoid valve, wherein a first opening of the two-position three-way solenoid valve is connected to the first oil suction port, a second opening of the two-position three-way solenoid valve is connected to the second oil suction port, and a third opening of the two-position three-way solenoid valve is connected to the oil supply pump; The controller is electrically connected to the two-position three-way solenoid valve, and is used to control the movement of the valve core of the two-position three-way solenoid valve so that the third opening is selectively connected to the first opening or the second opening.

7. The oil supply system of the electric drive assembly according to claim 6, characterized in that: The controller is configured to control the movement of the valve core of the two-position three-way solenoid valve according to the vehicle posture so that the third port is selectively connected to the first port or the second port.

8. The oil supply system of the electric drive assembly according to claim 5, characterized in that: The oil port switching mechanism includes a pressure pump, a two-position three-way hydraulic valve and a hydraulic cylinder. The first oil opening of the two-position three-way hydraulic valve is connected to the first oil suction port, the second oil opening of the two-position three-way hydraulic valve is connected to the second oil suction port, and the third oil opening of the two-position three-way hydraulic valve is connected to the oil supply pump. The inlet of the pressure pump is connected to the first oil suction port, and the outlet of the pressure pump is connected to the oil inlet of the hydraulic cylinder, so that the pressure pump is used to draw oil from the first oil suction port and place the oil into the hydraulic cylinder, and then drive the piston rod of the hydraulic cylinder to push the valve core of the two-position three-way hydraulic valve to move so that the third oil opening is selectively connected to the first oil opening or the second oil opening.

9. The oil supply system of the electric drive assembly according to claim 8, characterized in that: The output end of the piston rod of the hydraulic cylinder is connected to the valve core of the two-position three-way hydraulic valve. A return spring is sleeved on the outer periphery of the piston rod of the hydraulic cylinder. The return spring is used to push the piston rod in the reverse direction to return to the initial position. When the hydraulic cylinder is in the initial position, the third oil opening of the two-position three-way hydraulic valve is connected to the second oil opening.

10. The oil supply system of the electric drive assembly according to claim 8, characterized in that: The oil port switching mechanism further includes a power assembly, and the power assembly is used to drive the pressure pump and / or the oil supply pump.

11. The oil supply system of the electric drive assembly according to claim 10, characterized in that: The power assembly includes a drive motor and a connecting shaft; The connecting shaft is respectively connected to the oil supply pump and the pressure pump, and the output end of the driving motor is connected to the connecting shaft.

12. The oil supply system of the electric drive assembly according to claim 8, characterized in that: The oil port switching mechanism further includes a decompression component, which is connected to the oil chamber of the hydraulic cylinder and is used to control the oil pressure in the oil chamber to release pressure when it exceeds a preset pressure.

13. The oil supply system of the electric drive assembly according to claim 12, characterized in that: The pressure reducing assembly is a pressure reducing valve or a relief valve.

14. The oil supply system of the electric drive assembly according to any one of claims 1 to 13, characterized in that: The oil supply pipeline includes a first branch and a second branch. The inlets of the first branch and the second branch are both connected to the oil supply pump. The outlet of the first branch is used to connect to the oil supply end of the reducer system of the electric drive assembly. The outlet of the second branch is used to connect to the oil supply end of the motor system and the reducer system of the electric drive assembly.

15. The oil supply system of the electric drive assembly according to claim 14, characterized in that: The oil supply mechanism further includes a heat exchanger, which is disposed in the second branch and is used to reduce the temperature of the oil in the second branch.

16. The oil supply system of the electric drive assembly according to claim 15, characterized in that: The second branch located downstream of the heat exchanger forms a plurality of parallel sub-branches.

17. The oil supply system of the electric drive assembly according to any one of claims 1 to 13, characterized in that: The oil supply mechanism further includes an oil filter, which is arranged in the oil supply pipeline and close to the outlet of the oil supply pump; and / or The oil supply mechanism further includes a suction filter, which is arranged at one end of the first oil suction port facing the shell oil pool and at one end of the second oil suction port facing the shell oil pool.

18. An electric drive assembly, characterized in that: The invention comprises a motor system, a reducer system and an oil supply system of an electric drive assembly as claimed in any one of claims 1 to 17.

19. A vehicle, characterized in that: Including the electric drive assembly described in claim 18.

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