Fluid control device, electric drive system and vehicle

Abstract

The utility model discloses a fluid control device, an electric drive system and a vehicle. Wherein the third cavity is arranged between the first cavity and the second cavity; the first flow control unit is communicated with the first cavity and the third cavity, and the first flow control unit is used for controlling flowing of fluid between the first cavity and the third cavity and enabling the flow of the fluid flowing from the first cavity to the third cavity to be different from the flow of the fluid flowing from the third cavity to the first cavity; the second flow control unit is communicated with the second cavity and the third cavity; the second flow control unit is used for controlling the fluid to flow between the second cavity and the third cavity and enabling the flow of the fluid flowing from the second cavity to the third cavity to be different from the flow of the fluid flowing from the third cavity to the second cavity; the fluid pump is arranged in the third cavity and used for pumping fluid in the third cavity to the first cavity and the second cavity. According to the technical scheme, air suction of the oil pump can be effectively reduced, and the cooling effect on the motor is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vehicles, and particularly relates to a fluid control device, an electric drive system and a vehicle. BACKGROUND

[0002] The electric drive system is mainly used to provide power for the vehicle and is a core component of the vehicle. The current electric drive system is mainly a distributed electric drive adopting a double-motor structure. The axial size of the distributed electric drive system is relatively large, and the space for the oil to be distributed in the axial direction is also increased. When the vehicle is side-tilted or performs a motion with a large centrifugal force, the oil is easily gathered on one side, causing the oil pump to be air-sucked, which seriously affects the cooling effect of the oil on the motor. SUMMARY

[0003] The purpose of the present application is to provide a fluid control device capable of effectively reducing the air-sucking of the oil pump and improving the cooling effect on the motor.

[0004] Other characteristics and advantages of the present application will become apparent from the following detailed description, or will be learned by practice of the present application.

[0005] According to one aspect of the embodiments of the present application, the present application provides a fluid control device comprising a first cavity, a second cavity, a third cavity and a fluid pump, wherein the third cavity is arranged between the first cavity and the second cavity;

[0006] A first flow control unit is arranged between the first cavity and the third cavity, the first flow control unit being in communication with the first cavity and the third cavity, and the first flow control unit being configured to control the flow of fluid between the first cavity and the third cavity and to make the fluid flow from the first cavity to the third cavity different from the fluid flow from the third cavity to the first cavity;

[0007] A second flow control unit is arranged between the second cavity and the third cavity, the second flow control unit being in communication with the second cavity and the third cavity, and the second flow control unit being configured to control the flow of fluid between the second cavity and the third cavity and to make the fluid flow from the second cavity to the third cavity different from the fluid flow from the third cavity to the second cavity;

[0008] The fluid pump is arranged in the third cavity and is configured to pump the fluid in the third cavity to the first cavity and the second cavity.

[0009] In one aspect, the fluid flow from the first chamber to the third chamber is greater than the fluid flow from the third chamber to the first chamber, and the fluid flow from the second chamber to the third chamber is greater than the fluid flow from the third chamber to the second chamber.

[0010] In one aspect, the fluid flow from the third chamber to the first chamber is zero, and the fluid flow from the third chamber to the second chamber is zero.

[0011] In one aspect, the first flow control unit comprises a passive control valve or an active control valve, and the second flow control unit comprises a passive control valve or an active control valve, the passive control valve is driven by its own fluid pressure to open or close the valve core, and the active control valve is actively driven by a power source to open or close the valve core.

[0012] In one aspect, the passive control valve is a ball check valve, a rotary check valve, or a valve check valve.

[0013] In one aspect, the active control valve is an electromagnetic check valve, a piezoelectric check valve, or a hydraulic check valve.

[0014] In one aspect, a filter is further included, the filter is arranged in the third chamber, the filter is connected to the input end of the fluid pump, and the filter is used to filter the fluid in the third chamber before being delivered to the fluid pump.

[0015] In one aspect, the number of fluid pumps is one, and the number of filters is one.

[0016] In addition, in order to solve the above problems, the application further provides an electric drive system, which comprises a first motor, a second motor, and a fluid control device as described above, the first motor is arranged in the first chamber, the second motor is arranged in the second chamber, and the fluid pump pumps the fluid in the third chamber to the first chamber to cool the first motor, and pumps the fluid to the second chamber to cool the second motor.

[0017] In one aspect, a controller and a posture sensor are further included, the controller is connected to the posture sensor, the controller is also connected to the first flow control unit and the second flow control unit respectively, the posture sensor is used to detect the posture of the electric drive system, and the controller controls the opening or closing state of the first flow control unit and the second flow control unit based on the posture of the electric drive system.

[0018] In one aspect, the first flow control unit and the second flow control unit are located at the same horizontal level when the electric drive system is in the horizontal state, and the bottom surface of the third cavity is lower than the bottom surfaces of the first cavity and the second cavity.

[0019] In one aspect, the electric drive system is a distributed electric drive, the first motor is drivingly connected to a first wheel of the vehicle and is configured to control movement and steering of the first wheel, and the second motor is drivingly connected to a second wheel of the vehicle and is configured to control movement and steering of the second wheel, wherein the first wheel and the second wheel are located at opposite sides of the vehicle in the forward direction.

[0020] In one aspect, the electric drive system further comprises a third motor, a fourth motor, and another fluid control device as described above, the third motor is disposed in the first cavity of the other fluid control device, the fourth motor is disposed in the second cavity of the other fluid control device, and the fluid pump of the other fluid control device is configured to pump the fluid in the third cavity to the first cavity to cool the third motor and to the second cavity to cool the fourth motor.

[0021] In one aspect, the electric drive system is a distributed four-wheel drive, the third motor is drivingly connected to a third wheel of the vehicle and is configured to control movement and steering of the third wheel, and the fourth motor is drivingly connected to a fourth wheel of the vehicle and is configured to control movement and steering of the fourth wheel, wherein the third wheel and the fourth wheel are located at opposite sides of the vehicle in the forward direction, the first wheel and the third wheel are located at the same side of the vehicle in the forward direction, and the second wheel and the fourth wheel are located at the same side of the vehicle in the forward direction.

[0022] In addition, to solve the above problems, the application also provides a vehicle comprising a chassis and an electric drive system as described above, the chassis forms a mounting space, and the electric drive system is disposed in the mounting space.

[0023] In the application, when the fluid control device is in the inclined state, the oil in the third cavity will gather to one side, the liquid level of the oil will be lowered, and the fluid pump can pump less oil. At this time, the first flow control unit or the second flow control unit can function, the first flow control unit can allow the oil in the first cavity to flow back to the third cavity, or the second flow control unit can allow the oil in the second cavity to flow back to the third cavity. Thus, the liquid level of the oil in the third cavity is increased, and the fluid pump can effectively contact the oil, thereby effectively reducing the suction of the fluid pump, reducing the suction of the oil pump, ensuring that the oil can flow to the motor position, and improving the cooling effect of the motor.

[0024] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application, as claimed. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and serve to explain the principles of the application. It is to be understood that the drawings are only illustrative of certain embodiments of the application and that, to one of ordinary skill in the art, the scope of the application encompasses other embodiments that are apparent from the drawings and detailed description that follow.

[0026] Figure 1 The structural schematic diagram of the electric drive system of the application is schematically shown.

[0027] Figure 2 The structural schematic diagram of the electric drive system of the application is schematically shown.

[0028] Figure 3 The structural schematic diagram of the electric drive system of the application is schematically shown.

[0029] Figure 4 The structural schematic diagram of the electric drive system of the application is schematically shown.

[0030] Figure 5 The structural schematic diagram of the electric drive system of the application is schematically shown.

[0031] The reference signs are explained as follows:

[0032] 100, third cavity; 200, first cavity; 300, second cavity; 400, fluid pump; 510, first flow control unit; 520, second flow control unit; 530, controller; 540, attitude sensor; 600, filter; 710, first oil injection pipe; 720, second oil injection pipe; 730, common pipeline; 810, first motor; 820, second motor; 900, oil;

[0033] 111, first outer side wall; 112, second outer side wall. DETAILED DESCRIPTION

[0034] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of example implementations to those skilled in the art.

[0035] Reference Figures 1 to 4As shown, the present application provides a fluid control device, which is mainly applied in vehicles, and can also be applied in other types of carriers, such as ships, etc. The motor generates heat during operation, and the heat generated by the motor can be taken away by the cooling liquid. The cooling liquid can adopt oil, so that the motor can be cooled and lubricated at the same time, reducing the friction of various connecting shafts in the motor.

[0036] During driving, the vehicle will tilt to one side due to the unevenness of the road surface or when turning, which is easy to cause the oil 900 to also gather to one side. Therefore, the fluid control device comprises a first cavity 200, a second cavity 300, a third cavity 100, a fluid pump 400, a first flow control unit 510, and a second flow control unit 520.

[0037] The first flow control unit 510 is arranged between the first cavity 200 and the third cavity 100, and communicates the first cavity 200 and the third cavity 100. The first flow control unit 510 is used to control the flow of fluid between the first cavity 200 and the third cavity 100, and make the fluid flow from the first cavity 200 to the third cavity 100 different from the fluid flow from the third cavity 100 to the first cavity 200. The first flow control unit 510 is arranged between the third cavity 100 and the first cavity 200, and communicates the first cavity 200 and the third cavity 100. After the first flow control unit 510 is opened, the first cavity 200 and the third cavity 100 can be communicated, and the oil 900 in the first cavity 200 can flow to the third cavity 100. The fluid amount between the first cavity 200 and the third cavity 100 can be adjusted through the first flow control unit 510.

[0038] The second flow control unit 520 is arranged between the second cavity 300 and the third cavity 100, and communicates the second cavity 300 and the third cavity 100. The second flow control unit 520 is used to control the flow of fluid between the second cavity 300 and the third cavity 100, and make the fluid flow from the second cavity 300 to the third cavity 100 different from the fluid flow from the third cavity 100 to the second cavity 300. The second flow control unit 520 is arranged between the third cavity 100 and the second cavity 300, and communicates the second cavity 300 and the third cavity 100. After the second flow control unit 520 is opened, the second cavity 300 and the third cavity 100 can be communicated, and the oil 900 in the second cavity 300 can flow to the third cavity 100. The fluid amount between the second cavity 300 and the third cavity 100 can be adjusted through the second flow control unit 520.

[0039] The fluid pump 400 is arranged in the third cavity 100, and is used to pump the fluid in the third cavity 100 to the first cavity 200 and the second cavity 300.

[0040] Specifically, the fluid pump 400 is arranged in the third cavity 100, and the first cavity 200 and the second cavity 300 are arranged on two sides of the third cavity 100, for example, the first cavity 200 is arranged on the left side of the third cavity 100, and the second cavity 300 is arranged on the right side of the third cavity 100. The first flow control unit 510 and the second flow control unit 520 can be used to make the oil 900 in the first cavity 200 and the second cavity 300 flow back to the third cavity 100, so that the fluid pump 400 can contact the oil 900.

[0041] Further, the first cavity 200, the second cavity 300 and the third cavity 100 can be fully closed or semi-closed. The third cavity 100 is used to store the oil 900. In a normal case, that is, when the fluid control device is in a horizontal balanced state, the oil 900 stored in the third cavity 100 is sufficient, and the liquid level of the oil 900 is at least high enough to submerge the oil suction port of the fluid pump 400.

[0042] In the embodiment, when the fluid control device is in an inclined state, the oil in the third cavity 100 will gather on one side, the liquid level of the oil will be lowered, and the fluid pump 400 can pump less oil. At this time, the first flow control unit 510 or the second flow control unit 520 can be used to make the oil in the first cavity 200 flow back to the third cavity 100, or the second flow control unit 520 can be used to make the oil in the second cavity 300 flow back to the third cavity 100. In this way, the liquid level of the oil in the third cavity 100 is increased, and the fluid pump 400 can effectively contact the oil, thereby effectively reducing the suction of the fluid pump 400, reducing the suction of the oil pump, ensuring that the oil can flow to the motor position, and improving the cooling effect on the motor.

[0043] In the application, the fluid flow from the first cavity 200 to the third cavity 100 is greater than the fluid flow from the third cavity 100 to the first cavity 200, and the fluid flow from the second cavity 300 to the third cavity 100 is greater than the fluid flow from the third cavity 100 to the second cavity 300.

[0044] For example, when the fluid control device is in an inclined state, that is, the fluid control device is inclined to the left or the right. One of the first flow control unit 510 and the second flow control unit 520 is opened to make the oil 900 in the first cavity 200 flow back to the third cavity 100, or the oil 900 in the second cavity 300 flow back to the third cavity 100.

[0045] For example, the fluid control device is tilted to the right, at this time, the left side of the fluid control device is higher than the right side, the oil 900 will gather to the right side, the oil level of the third cavity 100 can be lower than the fluid pump 400. At this time, the first flow control unit 510 is opened, the second flow control unit 520 is closed, the first cavity 200 is connected to the third cavity 100, and the second cavity 300 is disconnected from the third cavity 100. The oil 900 in the first cavity 200 will flow back to the third cavity 100 through the first flow control unit 510, and the oil 900 in the third cavity 100 will not flow to the second cavity 300, so that the oil 900 in the third cavity 100 will increase, even if the oil 900 in the third cavity 100 tilts to the right, the oil level can still submerge the oil suction port of the fluid pump 400, and sufficient oil 900 supply can be ensured.

[0046] When the fluid control device is tilted to the left, at this time, the left side of the fluid control device is lower than the right side, the oil 900 will gather to the left side, the oil level of the third cavity 100 can be lower than the fluid pump 400. At this time, the first flow control unit 510 is closed, the second flow control unit 520 is opened, the first cavity 200 is disconnected from the third cavity 100, and the second cavity 300 is connected to the third cavity 100. The oil 900 in the second cavity 300 will flow back to the third cavity 100 through the second flow control unit 520, and the oil 900 in the third cavity 100 will not flow to the first cavity 200, so that the oil 900 in the third cavity 100 will increase, even if the oil 900 in the third cavity 100 tilts to the left, the oil level can still submerge the oil suction port of the fluid pump 400, and sufficient oil 900 supply can be ensured.

[0047] When the oil level of the third cavity 100 is low, the fluid flow from the third cavity 100 to the first cavity 200 can be controlled to be zero, and the fluid flow from the third cavity 100 to the second cavity 300 can be controlled to be zero. At this time, the third cavity 100 basically stops supplying oil to the first cavity 200 or the second cavity 300, or simultaneously stops supplying oil to the first cavity 200 and the second cavity 300, so as to ensure that the oil in the third cavity 100 is sufficient and the oil suction is less.

[0048] While reducing the air suction of the fluid pump 400, the fluid pump 400 can also be avoided from idling, and the service life of the fluid pump 400 can be improved. Moreover, sufficient oil supply can also lubricate the mechanical transmission parts of the electric drive system, and the overall service life of the electric drive system can be improved.

[0049] In order to further avoid the oil 900 in the third cavity 100 from flowing to the first cavity 200 or the second cavity 300, the first flow control unit 510 includes a passive control valve or an active control valve, and the second flow control unit 520 includes a passive control valve or an active control valve. The passive control valve is driven by the fluid pressure to open or close the valve core, and the active control valve is actively driven by the power source to open or close the valve core. That is, the first flow control unit 510 and the second flow control unit 520 can have two control modes, namely active control or passive control, and the control mode is more flexible.

[0050] The passive control valve is a ball check valve, a rotary check valve or a valve check valve, and the control process of the passive control valve is simple. The active control valve is an electromagnetic check valve, a piezoelectric check valve or a hydraulic check valve, and the operability of the active control valve is stronger, and the active control valve can be actively controlled according to the specific liquid level.

[0051] For example, the first flow control unit 510 and the second flow control unit 520 are both check valves, the conduction direction of the first flow control unit 510 is from the first cavity 200 to the third cavity 100, and the conduction direction of the second flow control unit 520 is from the second cavity 300 to the third cavity 100.

[0052] Through the setting of the check valve, the oil 900 in the first cavity 200 can only flow to the third cavity 100, and the oil 900 in the second cavity 300 can only flow to the third cavity 100, so as to avoid the oil 900 in the third cavity 100 from flowing reversely into the first cavity 200 and the second cavity 300, and improve the storage effect of the oil 900 in the third cavity 100. In consideration of the pumping of the fluid pump 400 to the oil 900, the oil 900 in the third cavity 100 is more or less, so as to improve the storage amount of the oil 900.

[0053] In addition, through the setting of the check valve, even if the first flow control unit 510 and the second flow control unit 520 are opened, the oil 900 can only flow from the first cavity 200 to the third cavity 100 and from the second cavity 300 to the third cavity 100 in one direction, and the reverse flow of the oil 900 in the third cavity 100 can also be avoided.

[0054] In the present application, after the oil 900 completes a cycle, impurities may be precipitated at the inner wall of the cavity or the position of mechanical friction, and impurities may also be mixed from the outside, which will affect the operation of the fluid pump 400. Therefore, the fluid control device further includes a filter 600, the filter 600 is arranged in the third cavity 100, the filter 600 is connected to the input end of the fluid pump 400, and the filter 600 is used to filter the fluid in the third cavity 100 before being delivered to the fluid pump 400.

[0055] Generally, the filter 600 is arranged on the side of the fluid pump 400 facing the bottom surface of the third cavity 100, i.e. the side of the fluid pump 400 facing the oil 900, so that the filter 600 can filter the oil 900 entering the fluid pump 400, adsorb impurities, and reduce the impact on the operation of the fluid pump 400. In this application, the number of fluid pumps 400 is one, and the number of filters 600 is one. The number of fluid pumps 400 and the number of filters 600 are arranged one-to-one.

[0056] In addition, a filter 600 can also be arranged at the outlet position of the fluid pump 400 to ensure that the oil 900 discharged from the fluid pump 400 can also be filtered.

[0057] In order to fully utilize the position space, the third cavity 100 has a first outer side wall 111 facing the first cavity 200, the first cavity 200 shares the first outer side wall with the third cavity 100, and the first flow control unit 510 is arranged on the first outer side wall 111. The formation of the first cavity 200 fully utilizes the structure of the third cavity 100, reduces the side wall surface arrangement of the first cavity 200, compresses the position space occupied by the first cavity 200, and also saves materials.

[0058] The third cavity 100 has a second outer side wall 112 facing the second cavity 300, the second cavity 300 shares the second outer side wall with the third cavity 100, and the second flow control unit 520 is arranged on the second outer side wall 112. The formation of the second cavity 300 also fully utilizes the structure of the third cavity 100, reduces the side wall surface arrangement of the second cavity 300, compresses the position space occupied by the second cavity 300, and also saves materials.

[0059] In addition, the third cavity 100, the first cavity 200, and the second cavity 300 can be separately arranged as a shell structure and assembled together by welding, or can be integrally arranged. The material of the third cavity 100, the first cavity 200, and the second cavity 300 can be aluminum alloy, or cast iron, stainless steel, etc.

[0060] In order to facilitate the backflow of the oil 900, the third cavity 100 is an oil pan, and the bottom surface of the third cavity 100 is lower than the bottom surfaces of the first cavity 200 and the second cavity 300 when the electric drive system is in a balanced state. The oil pan functions as an oil storage tank shell and is usually sealed to prevent impurities from entering. The oil pan can collect and store backflowing lubricating oil, dissipate heat, and prevent the lubricating oil from being oxidized. The oil pan is usually located at the lower part of the motor or engine and is usually detachably arranged.

[0061] As can be seen from the above, the bottom surface of the third cavity 100 is lower, and in the balanced state, i.e. the electric drive system is in a horizontal position without left and right tilting, the bottom surface of the first cavity 200 and the bottom surface of the second cavity 300 are higher than the bottom surface of the third cavity 100. Under the action of gravity, the oil 900 in the first cavity 200 and the oil 900 in the second cavity 300 have higher potential energy and will flow to the third cavity 100 located at the lower position.

[0062] The application also provides an electric drive system, which comprises a first motor 810, a second motor 820, and a fluid control device. The first motor 810 is arranged in the first cavity 200, the second motor 820 is arranged in the second cavity 300, and the fluid pump 400 pumps the fluid in the third cavity 100 to the first cavity 200 to cool the first motor 810 and to the second cavity 300 to cool the second motor 820.

[0063] The first motor 810 and the second motor 820 generate heat when working, and mechanical friction also exists.

[0064] The electric drive system further comprises a first oil injection pipe 710 and a second oil injection pipe 720, both of which are connected to the fluid pump 400. The first oil injection pipe 710 extends from the fluid pump 400 to the first cavity 200, and the second oil injection pipe 720 extends from the fluid pump 400 to the second cavity 300. When the fluid pump 400 works, the oil 900 is pumped into the first oil injection pipe 710 by the fluid pump 400 and sprayed to the first motor 810 in the first cavity 200 along the first oil injection pipe 710. The oil 900 sprayed to the first motor 810 through the first oil injection pipe 710 exchanges heat with the first motor 810, carries away the heat of the first motor 810, and at the same time lubricates the bearings, power output shafts, power input shafts and other mechanisms of the first motor 810. After heat exchange and lubrication, the oil 900 flows back to the first cavity 200.

[0065] The first motor 810 in the first cavity 200 is cooled. The fluid pump 400 can also pump the oil 900 into the second oil injection pipe 720 and spray it to the second motor 820 in the second cavity 300 along the second oil injection pipe 720. The oil 900 sprayed to the second motor 820 through the second oil injection pipe 720 exchanges heat with the second motor 820, carries away the heat of the second motor 820, and at the same time lubricates the bearings, power output shafts, power input shafts and other mechanisms of the second motor 820 to cool the second motor 820 in the second cavity 300.

[0066] The oil liquid 900 sprayed into the first cavity 200 can automatically flow back to the bottom of the first cavity 200 after completing the cooling and lubrication, and then flow back to the third cavity 100 through the first flow control unit 510. The oil liquid 900 sprayed into the second cavity 300 can also automatically flow back to the bottom of the second cavity 300 after completing the cooling and lubrication, and then flow back to the third cavity 100 through the second flow control unit 520. Therefore, the oil liquid 900 in the electric drive system forms a complete loop, and the oil liquid 900 can be recycled, thereby reducing the supplement of the oil liquid 900.

[0067] In order to reduce the setting of the pipeline, the electric drive system in the application further includes a shared pipeline 730, one end of the shared pipeline 730 is connected to the fluid pump 400, and the other end is respectively connected to the first oil injection pipe 710 and the second oil injection pipe 720. The shared pipeline 730 is bifurcated at the end away from the fluid pump 400 to form two connection ports, one connection port is connected to the first oil injection pipe 710, and the other connection port is connected to the second oil injection pipe 720. By setting the shared pipeline 730 on the common path of the fluid pump 400 connecting the first oil injection pipe 710 and the second oil injection pipe 720, the setting of the pipeline is reduced.

[0068] Referring to Figure 5 As shown in the figure, the electric drive system further includes a controller 530 and a posture sensor 540, the controller 530 is connected to the posture sensor 540, and the controller 530 is also respectively connected to the first flow control unit 510 and the second flow control unit 520. The posture sensor 540 is used to detect the posture of the electric drive system, and the controller 530 controls the opening or closing state of the first flow control unit 510 and the second flow control unit 520 based on the posture of the electric drive system.

[0069] The posture sensor 540 can also be understood as an inclination sensor, which is also called an inclinometer, an inclinometer, a level, and an inclinometer, and is often used for measuring the horizontal angle change of the system.

[0070] The specific control process of the electric drive system can be that the posture sensor 540 detects the inclination state of the electric drive system or the vehicle, and when detecting that the vehicle is inclined, it can be judged whether the vehicle is inclined to the right or to the left.

[0071] For example, after detecting that the vehicle is inclined to the right, the posture sensor 540 feeds back the signal of the right inclination of the vehicle to the controller 530, the controller 530 generates a first control signal, and sends the first control signal to the first flow control unit 510. The first flow control unit 510 is turned on based on the first control signal, so that the oil liquid 900 in the first cavity 200 flows back to the third cavity 100 through the first flow control unit 510.

[0072] When the vehicle is detected to be tilted to the left, the attitude sensor 540 feeds back a signal of the vehicle being tilted to the left to the controller 530, the controller 530 generates a second control signal and sends the second control signal to the second flow control unit 520, and the second flow control unit 520 opens the conduction based on the second control signal, so that the oil 900 in the second cavity 300 flows back to the third cavity 100 through the second flow control unit 520.

[0073] In an embodiment of the present application, the electric drive system is a distributed electric drive, the first motor 810 is in driving connection with a first wheel of the vehicle and is used to control the movement and steering of the first wheel, and the second motor 820 is in driving connection with a second wheel of the vehicle and is used to control the movement and steering of the second wheel, wherein the first wheel and the second wheel are located on opposite sides of the vehicle in the forward direction. In this embodiment, the vehicle adopts a front-wheel drive mode. In addition, a rear-wheel drive mode or a four-wheel drive mode can also be adopted.

[0074] In an embodiment of the present application, the electric drive system further comprises a third motor, a fourth motor and another fluid control device, the third motor is arranged in the first cavity 200 of the other fluid control device, the fourth motor is arranged in the second cavity 300 of the other fluid control device, and the fluid pump 400 of the other fluid control device pumps the fluid in the third cavity 100 to the first cavity 200 to cool the third motor and pumps to the second cavity 300 to cool the fourth motor. In this embodiment, two fluid control devices can be arranged, and the two fluid control devices can operate independently, and the control mode is more independent and flexible.

[0075] In an embodiment of the present application, the electric drive system is a distributed four-wheel drive, the third motor is in driving connection with a third wheel of the vehicle and is used to control the movement and steering of the third wheel, and the fourth motor is in driving connection with a fourth wheel of the vehicle and is used to control the movement and steering of the fourth wheel, wherein the third wheel and the fourth wheel are located on opposite sides of the vehicle in the forward direction, the first wheel and the third wheel are located on the same side of the vehicle in the forward direction, and the second wheel and the fourth wheel are located on the same side of the vehicle in the forward direction.

[0076] In order to ensure the cooling effect of the electric drive system,

[0077] It should be noted that, in order to improve the oil return effect, two return fluid pumps 400, i.e., a first return fluid pump 400 and a second return fluid pump 400, can also be arranged in the present application, the first return fluid pump 400 is arranged in the first cavity 200, the second return fluid pump 400 is arranged in the second cavity 300, the first return fluid pump 400 can pump the oil 900 in the first cavity 200 back to the third cavity 100, and the second return fluid pump 400 can pump the oil 900 in the second cavity 300 back to the third cavity 100.

[0078] For example, the electric drive system tilts to the right, at this time, the left side of the electric drive system is higher than the right side, the oil 900 will gather to the right side, and the liquid level of the oil 900 in the third cavity 100 can be lowered below the fluid pump 400. At this time, the attitude sensor 540 detects that the electric drive system tilts to the right, the attitude sensor 540 feeds back the signal of the right tilt to the controller 530, the controller 530 generates a first control signal, and sends the first control signal to the first flow control unit 510 and also sends the first control signal to the second back fluid pump 400. The first flow control unit 510 is turned on, and the second back fluid pump 400 starts to operate. The first cavity 200 is connected to the third cavity 100, and the oil 900 in the first cavity 200 is backflowed to the third cavity 100 through the first flow control unit 510. At the same time, through the operation of the second back fluid pump 400, the oil 900 in the second cavity 300 is also pumped back to the third cavity 100, so that the oil 900 in the third cavity 100 increases, and sufficient oil 900 supply is ensured.

[0079] For another example, the electric drive system tilts to the left, at this time, the left side of the electric drive system is lower than the right side, the oil 900 will gather to the left side, and the liquid level of the oil 900 in the third cavity 100 can be lowered below the fluid pump 400. At this time, the attitude sensor 540 detects that the electric drive system tilts to the left, the attitude sensor 540 feeds back the signal of the left tilt to the controller 530, the controller 530 generates a second control signal, and sends the second control signal to the second flow control unit 520 and also sends the second control signal to the first back fluid pump 400. The second flow control unit 520 is turned on, and the first back fluid pump 400 starts to operate. The second cavity 300 is connected to the third cavity 100, and the oil 900 in the second cavity 300 is backflowed to the third cavity 100 through the second flow control unit 520. At the same time, through the operation of the first back fluid pump 400, the oil 900 in the first cavity 200 is also pumped back to the third cavity 100, so that the oil 900 in the third cavity 100 increases, and sufficient oil 900 supply is ensured.

[0080] Therefore, on the basis of the one-way valve, the backflow effect to the third cavity 100 can be further improved by cooperating with the setting of the back fluid pump 400, and the oil 900 is accelerated to backflow.

[0081] The application also provides a vehicle, which comprises a chassis and an electric drive system, the chassis forms a mounting space, and the electric drive system is arranged in the mounting space.

[0082] Other specific embodiments and beneficial effects of the vehicle are described above in the scheme of the electric drive system, and will not be described here again.

[0083] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope of the application being indicated by the following claims.

[0084] It is to be understood that the application is not limited to the precise construction herein disclosed and shown in the drawings, and that various changes in shape, size and arrangements of parts can be made without departing from the scope of the application as recited in the claims. The scope of the application is only limited by the appended claims.

Claims

1. A fluid control device, characterized by, The fluid control device comprises a first cavity, a second cavity, a third cavity and a fluid pump, the third cavity is arranged between the first cavity and the second cavity; A first flow control unit is arranged between the first cavity and the third cavity, the first flow control unit communicates the first cavity and the third cavity, and is used for controlling the flow of fluid between the first cavity and the third cavity and making the fluid flow from the first cavity to the third cavity different from the fluid flow from the third cavity to the first cavity; A second flow control unit is arranged between the second cavity and the third cavity, the second flow control unit communicates the second cavity and the third cavity, and is used for controlling the flow of fluid between the second cavity and the third cavity and making the fluid flow from the second cavity to the third cavity different from the fluid flow from the third cavity to the second cavity; The fluid pump is arranged in the third cavity and is used for pumping the fluid in the third cavity to the first cavity and the second cavity.

2. The fluid control device of claim 1, wherein, The fluid flow from the first cavity to the third cavity is greater than the fluid flow from the third cavity to the first cavity, and the fluid flow from the second cavity to the third cavity is greater than the fluid flow from the third cavity to the second cavity.

3. The fluid control device of claim 1, wherein, The fluid flow from the third cavity to the first cavity is zero, and the fluid flow from the third cavity to the second cavity is zero.

4. The fluid control device of claim 1, wherein, The first flow control unit comprises a passive control valve or an active control valve, and the second flow control unit comprises a passive control valve or an active control valve, the passive control valve is driven by the fluid pressure of itself to open or close the valve core, and the active control valve is actively driven by a power source to open or close the valve core.

5. The fluid control device of claim 4, wherein, The passive control valve is a ball check valve, a rotary check valve or a valve check valve.

6. The fluid control device of claim 4, wherein, The active control valve is an electromagnetic check valve, a piezoelectric check valve or a hydraulic check valve.

7. The fluid control device of claim 1, wherein, A filter is further included, the filter is arranged in the third cavity, the filter is connected to the input end of the fluid pump, and the filter is used for filtering the fluid in the third cavity before conveying the fluid to the fluid pump.

8. The fluid control device of claim 7, wherein, The number of the fluid pump is one, and the number of the filter is one.

9. An electric drive system characterized by, The electric drive system comprises a first motor, a second motor and a fluid control device as claimed in any one of claims 1-8, the first motor is arranged in the first cavity, the second motor is arranged in the second cavity, and the fluid pump pumps the fluid in the third cavity to the first cavity to cool the first motor and to the second cavity to cool the second motor.

10. The electric drive system of claim 9, wherein, The controller is connected to the attitude sensor, and is also connected to the first flow control unit and the second flow control unit respectively. The attitude sensor is used to detect the attitude of the electric drive system, and the controller controls the opening or closing state of the first flow control unit and the second flow control unit based on the attitude of the electric drive system.

11. The electric drive system according to claim 9 or 10, characterized in that When the electric drive system is in a horizontal state, the first flow control unit and the second flow control unit are located on the same horizontal plane, and the bottom surface of the third cavity is lower than the bottom surfaces of the first cavity and the second cavity.

12. The electric drive system of claim 9 or 10, wherein, The electric drive system is a distributed electric drive, the first motor is in driving connection with a first wheel of the vehicle and is used to control the movement and steering of the first wheel, and the second motor is in driving connection with a second wheel of the vehicle and is used to control the movement and steering of the second wheel, wherein the first wheel and the second wheel are located on different sides of the vehicle in the forward direction.

13. The electric drive system of claim 12, wherein, The electric drive system further comprises a third motor, a fourth motor, and another fluid control device as claimed in any one of claims 1-8, the third motor is arranged in the first cavity of the other fluid control device, the fourth motor is arranged in the second cavity of the other fluid control device, and the fluid pump of the other fluid control device pumps the fluid in the third cavity to the first cavity to cool the third motor, and pumps the fluid to the second cavity to cool the fourth motor.

14. The electric drive system of claim 13, wherein, The electric drive system is a distributed four-wheel drive, the third motor is in driving connection with a third wheel of the vehicle and is used to control the movement and steering of the third wheel, and the fourth motor is in driving connection with a fourth wheel of the vehicle and is used to control the movement and steering of the fourth wheel, wherein the third wheel and the fourth wheel are located on different sides of the vehicle in the forward direction, the first wheel and the third wheel are located on the same side of the vehicle in the forward direction, and the second wheel and the fourth wheel are located on the same side of the vehicle in the forward direction.

15. A vehicle characterized by comprising: The chassis forms a mounting space, and the electric drive system is arranged in the mounting space.

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