Electric drive system and electric drive vehicle

Abstract

An electric drive system (1), comprising an electric motor (10), a gearbox (20), and a bottom oil path (40). The electric motor (10) comprises an electric motor housing (11), and the electric motor housing (11) has an electric motor cavity (11a) and oil inlets; the gearbox (20) is in power connection with the electric motor (10), the gearbox (20) comprises a gearbox body (21), and the gearbox body (21) has a gearbox cavity (21c) and oil outlets; and the bottom oil path (40) is in communication with the electric motor cavity (11a) and the gearbox cavity (21c). When the electric drive system (1) is in a horizontal state, the height of all the oil inlets is not lower than that of any oil outlet, and the oil inlets connected to the bottom oil path (40) are arranged circumferentially at the bottom of the electric motor housing (11), in order to enable oil in the electric motor cavity (11A) to flow back into the gearbox cavity (21C) in a first preset slope state of the electric drive system (1), ensuring an appropriate oil level within the electric drive system (1).

Description

Electric drive system and electric drive vehicle

[0001] This application claims priority to Chinese patent application No. 202310896619.4 filed on July 19, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of electric vehicles, and in particular to an electric drive system and an electric drive vehicle. Background Art

[0003] As the integration of pure electric drives increases, oil cooling of the drive motor is becoming a trend. Both the motor rotor and electronic stator are cooled directly by a spray of transmission oil. After dissipating heat from the windings, the oil flows into the lower portion of the motor cavity due to its own weight. This oil then flows back into the gear cavity, continuing the cooling and lubrication cycle of the electric drive.

[0004] Some vehicles, such as off-road vehicles, often tilt when driving in harsh conditions such as longitudinal and transverse slopes, causing abnormal oil levels in the vehicle's electric drive system. This may cause the oil pump to suck in air, resulting in insufficient cooling, noise, and vibration problems, increased motor oil stirring losses, and reduced mechanical efficiency. Technical issues

[0005] In view of this, embodiments of the present application provide an electric drive system and an electric drive vehicle to solve the problem of abnormal oil level in the electric drive system affecting the operation of the electric drive vehicle under harsh working conditions. Technical Solutions

[0006] An embodiment of the present application provides an electric drive system, comprising: a motor, comprising a motor housing, the motor housing having a motor cavity and an oil inlet connected to the motor cavity; a gearbox, dynamically connected to the motor, the gearbox comprising a gearbox housing, the gearbox housing having a gearbox cavity and an oil outlet connected to the gearbox cavity; a bottom oil circuit, connecting the motor cavity and the gearbox cavity, the bottom oil circuit having one end connected to the corresponding oil inlet and one end connected to the corresponding oil outlet;

[0007] In which, when the electric drive system is in a horizontal state, the height of all the oil inlets is not lower than the height of any of the oil outlets, and the oil inlets connected to the bottom oil circuit are arranged circumferentially at the bottom of the motor housing, so that when the electric drive system is in a first preset slope state, the oil in the motor cavity can flow back into the gearbox cavity.

[0008] In some embodiments, the motor housing and the gearbox housing are integrally formed.

[0009] In some embodiments, the bottom oil circuit is provided on the motor housing to form a bottom oil channel.

[0010] In some embodiments, the motor housing has a partition wall separating the motor cavity and the gearbox cavity, the bottom oil circuit is provided on the partition wall to form an oil return port, and the oil return port is arranged circumferentially on the partition wall.

[0011] In some embodiments, the electric drive system includes a first control valve, which is fixed on the partition wall and is used to control the opening and closing of the bottom oil channel; when the electric drive system is in a horizontal state, the first control valve is in an open state; when the electric drive system is in a first preset slope state, the first control valve is in a closed state.

[0012] In some embodiments, the first control valve is a movable baffle, and the orthographic projection of the movable baffle covers the oil outlet connected to the bottom oil channel.

[0013] In some embodiments, the transmission case includes a step wall, which is located below the bottom oil channel. The step wall includes a slanted wall, which is located in the oil outlet direction of the oil outlet connected to the bottom oil channel. When the electric drive system is in a second preset slope state, the movable baffle can fit with the slanted wall.

[0014] In some embodiments, the cross-sectional shape of the bottom oil passage or the oil return port is a sector ring.

[0015] In some embodiments, the electric drive system further includes a bypass oil circuit, which is disposed outside the motor housing and connects the motor cavity and the gearbox cavity. One end of each bypass oil circuit is connected to the corresponding oil inlet, and the other end is connected to the corresponding oil outlet.

[0016] In some embodiments, the gearbox includes an input shaft and an output shaft, and there is a height difference between the input shaft and the output shaft. When the electric drive system is in a horizontal state, the line connecting the oil inlet and the oil outlet connected by the bypass oil circuit is set at an angle to the horizontal plane.

[0017] In some embodiments, the motor includes a reinforcing plate, one side of the reinforcing plate is connected to the outside of the gearbox housing, and the other side is connected to the outside of the motor housing, and the bypass oil path is arranged in the reinforcing plate to form a bypass oil channel.

[0018] In some embodiments, the motor includes a second control valve, which is arranged in the reinforcement plate and connected to the bypass oil channel. When the bypass oil channel is tilted and the connected oil outlet is higher than the connected oil inlet, the second control valve blocks the bypass oil channel.

[0019] In some embodiments, the transmission case includes an oil baffle, the transmission cavity includes a gear cavity and an oil suction cavity, the gear cavity and the oil suction cavity are separated by the oil baffle, the oil outlet connected to the bypass oil circuit is connected to the gear cavity, and the oil outlet connected to the bottom oil circuit is connected to the oil suction cavity.

[0020] An embodiment of the present application further provides an electric vehicle, which is provided with the electric drive system described in any of the above embodiments. Beneficial effects

[0021] The electric drive system provided in an embodiment of the present application includes a gearbox, a motor, and a bottom oil circuit. The motor includes a motor housing having a motor cavity and an oil inlet connected to the motor cavity; the gearbox is connected to the motor, and the gearbox includes a gearbox housing having a gearbox cavity and an oil outlet connected to the gearbox cavity; the bottom oil circuit connects the motor cavity and the gearbox cavity, with one end of the bottom oil circuit connected to the corresponding oil inlet and one end connected to the corresponding oil outlet. When the electric drive system is in a horizontal state, the height of all the oil inlets is not lower than the height of any of the oil outlets, allowing oil in the motor cavity to flow back into the gearbox cavity, maintaining an appropriate oil level in the gearbox cavity. When the electric drive system is in a first preset slope state, because the oil inlets connected to the bottom oil circuit are arranged circumferentially at the bottom of the motor housing, the bottom oil circuit allows oil in the motor cavity to still flow back into the gearbox cavity. Under different operating conditions, the gearbox cavity maintains an appropriate oil level as much as possible. The present application also provides an electric drive vehicle equipped with the above-mentioned electric drive system, which can adapt to driving conditions on different inclined roads and improve the stability of the electric drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic diagram of the structure of an electric drive system provided by the present application;

[0023] FIG2 is a schematic diagram of a partial structure of an electric drive system provided by the present application from a right perspective, omitting the gearbox gears;

[0024] FIG3 is a schematic diagram of a partial structure of an electric drive system provided by the present application, viewed from a rear perspective, wherein the electric drive system is in a horizontal state;

[0025] FIG4 is a schematic diagram of a partial structure of an electric drive system provided by the present application, viewed from a rear perspective, wherein the electric drive system is in a first preset slope state;

[0026] FIG5 is a schematic diagram of a partial structure of an electric drive system provided by the present application from a left perspective;

[0027] FIG6 is a schematic diagram of the oil level of an electric drive system provided in the present application under a preset horizontal slope state.

[0028] Description of Reference Numerals

[0029] 1-Electric drive system

[0030] 10-motor; 11-motor housing; 11A-motor cavity; 12-partition wall; 13-reinforcement plate;

[0031] 20-gearbox; 21-gearbox housing; 21A-gear chamber; 21B-oil suction chamber; 21C-gearbox chamber; 211-step wall, 2111-slanted wall; 212-oil retaining rib;

[0032] 30-first control valve;

[0033] 40-Bottom oil circuit; 41-Bottom oil channel; 42-Oil return port

[0034] 50-Bypass oil circuit; 51-Bypass oil channel. Modes for Carrying Out the Invention

[0035] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] In the description of the embodiments of the present application, it should be noted that the terms "front," "rear," "left," "right," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the embodiments of the present application and to simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the embodiments of the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0037] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood in specific circumstances.

[0038] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] An embodiment of the present application provides an electric drive system 1, which, with reference to Figures 1 to 5, includes a motor 10, a gearbox 20 and a bottom oil circuit 40; the motor 10 includes a motor housing 11, the motor housing 11 having a motor cavity 11A and an oil inlet connected to the motor cavity 11A; the gearbox 20 is power-connected to the motor 10, and the gearbox 20 includes a gearbox case 21, the gearbox case 21 having a gearbox cavity 21C and an oil outlet connected to the gearbox cavity 21C; the bottom oil circuit 40 connects the motor cavity 11A and the gearbox cavity 21C, and one end of the bottom oil circuit 40 is connected to the corresponding oil inlet, and the other end is connected to the corresponding oil outlet.

[0040] In which, when the electric drive system 1 is in a horizontal state, the height of all the oil inlets is not lower than the height of any of the oil outlets, and the oil inlets connected to the bottom oil circuit 40 are arranged circumferentially at the bottom of the motor housing 11, so that when the electric drive system 1 is in a first preset slope state, the oil in the motor cavity 11A can flow back to the gearbox cavity 21C.

[0041] In one embodiment, as shown in FIG1 , the “horizontal state” mentioned above means that the electric drive system remains horizontal in the front-back and left-right directions.

[0042] In one embodiment, the "first preset slope state" refers to a situation in which the electric drive system tilts forward or backward in the fore-aft direction under certain operating conditions. For example, if the electric drive system 1 is fixedly mounted on a vehicle, the first preset slope state may be when the vehicle is climbing a longitudinal slope. At a 100% slope, the electric drive system 1 tilts backward 45°. Depending on how the drive components of the electric vehicle are mounted, the first preset slope state may be a preset longitudinal slope state or a preset transverse slope state.

[0043] In one embodiment, "arranged circumferentially at the bottom of the motor housing" refers to a position near the bottom of a circumferential area centered on the motor shaft, for example, it can be the circumference of the lower half of the motor housing 11, or the circumference directly below the motor housing 11 with a central angle of 60 to 120 degrees.

[0044] When the electric drive system 1 tilts in the front-to-back direction, the oil in the motor cavity 11A will also adaptively change. Because the corresponding oil inlets connected to the bottom oil circuit are arranged circumferentially on the motor housing 11, and the arrangement angle can be adjusted to meet the required operating conditions, the oil will always enter the corresponding oil inlet connected to the bottom oil circuit 40, and then return to the transmission cavity 21C, improving the internal oil level when the electric drive system 1 tilts in the front-to-back direction. For example, referring to Figure 2, if the electric drive system 1 is higher in the front and lower in the back, the oil will enter the bottom oil circuit 40 along the rear oil inlet in Figure 2 (for example, the rear portion of the fan-shaped annular areas 41 and 42 indicated in Figure 2). If the electric drive system 1 is lower in the front and higher in the back, the oil will enter the bottom oil circuit 40 along the front oil inlet in Figure 2 (for example, the front portion of the fan-shaped annular areas 41 and 42 indicated in Figure 2). In some embodiments, the motor housing 11 and the transmission case 21 are integrally formed, for example, using a casting process to improve the sealing and integration of the entire electric drive system 1.

[0045] In some embodiments, referring to Figures 2 through 4 , a bottom oil passage 40 is provided on the motor housing 11 to form a bottom oil channel 41. The bottom oil channel 41 extends along the motor housing 11 in the direction of the main axis of the motor 10, directing oil drawn from the oil inlet to the corresponding oil outlet. As will be appreciated, referring to Figure 3 , the oil inlet is located at the left end of the bottom oil channel 41, and the oil outlet is located at the right end of the bottom oil channel 41.

[0046] In some embodiments, referring to Figures 2 to 4, the motor housing 11 has a partition wall 12 that separates the motor cavity 11A and the transmission cavity 21C, and the bottom oil passage 40 is arranged on the partition wall 12 to form an oil return port 42. The oil return port 42 has an oil inlet at one end and an oil outlet at the other end. It is arranged circumferentially on the partition wall 12. It can be seen that the oil return port 42 directly connects the motor cavity 11A and the transmission cavity 21C, and quickly diverts the oil absorbed by the oil inlet to the corresponding connected oil outlet. The oil return port 42 is arranged circumferentially on the partition wall 12, which can play a similar role to the bottom oil channel 41. When the electric drive system 1 is tilted in the front and rear directions, the oil can still be diverted to the transmission cavity 21C.

[0047] In some embodiments, the electric drive system 1 includes a first control valve 30, which is fixed on the partition wall 12 and is used to control the opening and closing of the bottom oil circuit 40; when the electric drive system 1 is in a horizontal state, the first control valve 30 is in an open state, and the oil flows from the oil inlet to the oil outlet of the bottom oil circuit; when the electric drive system 1 is in a second preset slope state, the first control valve 30 is in a closed state.

[0048] It should be noted that the aforementioned "second preset slope state" refers to the situation where the electric drive system tilts left or right in the left-right direction under certain operating conditions. For example, if the electric drive system 1 is fixedly mounted on a vehicle and the second preset slope state is traveling on a transverse slope with a transverse slope of 60%, the electric drive system 1 tilts left or right by approximately 31°, with the tilt direction being affected by the vehicle's direction of travel. Depending on how the drive components of the electric drive vehicle are mounted, the second preset slope state can be either a preset longitudinal slope state or a preset transverse slope state.

[0049] For example, as shown in FIG4 , when the electric drive system 1 tilts to the left, the oil in the transmission cavity 21C on the right side is at risk of flowing back into the motor cavity 11A through the bottom oil passage 40. At this time, the first control valve 30 is closed, and the connection between the bottom oil passage 40 and the transmission cavity 21C is cut off, thereby preventing the oil from flowing back and improving the internal oil level when the electric drive system 1 tilts in the left-right direction.

[0050] In some embodiments, as shown in FIG4 , the first control valve 30 is a movable baffle, the orthographic projection of which covers the oil outlet connected to the bottom oil passage 40. In this manner, the movable baffle can control the opening and closing of the bottom oil passage 40 by covering the oil outlet connected to the bottom oil passage 40 through gravity. It is understood that the first control valve can also be a one-way valve, disposed in each bottom oil passage 41 and oil return port 42, to also control the opening and closing of the bottom oil passage 40.

[0051] In some embodiments, as shown in Figure 3 or Figure 4, the transmission case 21 includes a step wall 211, the step wall 22 is located below the bottom oil channel 41, and the step wall 211 includes a slanted wall 2111. The slanted wall 2111 is located in the oil outlet direction of the oil outlet connected to the bottom oil channel 41. When the electric drive system 1 is in the second preset slope state, the movable baffle is tilted toward the direction of the electric drive system 1 due to its own weight or oil pressure, and fits with the slanted wall 2111, thereby forming a partition on the side of the slanted wall 2111 facing the bottom oil channel 41, preventing the oil in the transmission cavity from entering the bottom oil channel 40 and causing backflow.

[0052] In some embodiments, as shown in FIG2 , the cross-sectional shape of the bottom oil passage 41 or the oil return port 42 is a fan-shaped ring. It should be noted that the "fan-shaped ring" described above refers to a shape formed by a segment of a circular ring in its curvature. A circumferentially arranged fan-shaped ring-shaped bottom oil passage or oil return port can cover a wider circumferential range, accommodating more severe forward and backward tilt conditions of the electric drive system 1. The cross-sectional shape of the bottom oil passage 41 or the oil return port 42 can also be circular, square, or a special shape.

[0053] In some embodiments, the electric drive system 1 further includes a bypass oil passage 50 disposed outside the motor housing 11. The bypass oil passage 50 connects the motor cavity 11A and the transmission cavity 21C. Each bypass oil passage 50 is connected to a corresponding oil inlet at one end and to a corresponding oil outlet at the other end. The bypass oil passage 50 can divert oil from the motor cavity 11A to the transmission cavity 21C.

[0054] In some embodiments, as shown in FIG6 , the gearbox 20 includes an input shaft 22 and an output shaft 23 . When the electric drive system 1 is in a horizontal state, there is a vertical height difference diff drop between the input shaft 22 and the output shaft 23 , and a line connecting the oil inlet and the oil outlet connected by the bypass oil passage 50 is set at an angle φ to the horizontal plane.

[0055] It is understood that the output shaft 22 is along the power axis of the motor 10, and the output shaft 23 is along the last gear axis of the transmission 20. Therefore, the height difference between the bottom of the motor housing 11 and the bottom of the transmission housing 21 is positively correlated with the magnitude of the aforementioned vertical height difference (diff drop). The larger the diff drop, the more difficult it is for the oil in the transmission cavity 21C to flow back into the motor cavity 11A. The bypass oil passage 50 in this embodiment serves the following purpose: when the electric drive system is in a second preset slope state and oil backflow occurs in the transmission cavity 21C, the bypass oil passage 50, due to the angle φ, is set so that the corresponding oil inlet is still higher than the corresponding oil outlet. The oil accumulated in the motor cavity 11A can flow back into the transmission cavity 21C through the bypass oil passage 50. To adapt to working conditions with different degrees of inclination, the angle φ should be adjusted according to the magnitude of the diff drop. The larger the diff drop, the larger the angle φ.

[0056] In some embodiments, as shown in FIG5 , the motor 10 includes a reinforcing plate 13 , one side of the reinforcing plate 13 is connected to the outside of the gearbox housing 21 , and the other side is connected to the outside of the motor housing 11 , and the bypass oil passage 50 is arranged in the reinforcing plate to form a bypass oil passage 51 .

[0057] It should be noted that, in some embodiments, the motor 10 does not include a reinforcement plate and does not form the bypass oil passage 51 . Instead, an external oil pipe is added as the bypass oil passage 50 .

[0058] In some embodiments, the motor 10 includes a second control valve, which is disposed in the reinforcing plate 13 and connected to the bypass oil channel 51. When the bypass oil channel 51 is tilted and the connected oil outlet is higher than the connected oil inlet, the second control valve blocks the bypass oil channel, thereby preventing the oil from flowing back through the bypass oil channel 51.

[0059] In some embodiments, referring to Figures 1 and 2, the transmission case 21 includes an oil retaining rib 212, and the transmission cavity 21C includes a gear cavity 21A and an oil suction cavity 21B. The gear cavity 21A and the oil suction cavity 21B are separated by the oil retaining rib 212. The oil outlet connected to the bypass oil passage 50 is connected to the gear cavity 21A, and the oil outlet connected to the bottom oil passage 40 is connected to the oil suction cavity 21B. The bypass oil passage 50 and the bottom oil passage 40 have oil outlets leading to different areas, which can prevent oil from leaking and can also prevent the bypass oil passage 50 and the bottom oil passage 40 from simultaneously backflowing due to the tilt of the electric drive system 1 when the oil level changes due to the operation of other components in the transmission 20, such as the oil suction pump.

[0060] An embodiment of the present application also provides an electric drive vehicle, which is equipped with the electric drive system 1 described in any of the above embodiments. The electric vehicle can adapt to longitudinal or transverse slopes of different slopes, and its electric drive system operates stably.

[0061] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0062] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An electric drive system, wherein: The electric drive system comprises: The motor comprises a motor housing, wherein the motor housing has a motor cavity and an oil inlet communicated with the motor cavity; A gearbox, connected to the motor power, the gearbox comprising a gearbox housing, the gearbox housing having a gearbox cavity and an oil outlet connected to the gearbox cavity; A bottom oil circuit, communicating the motor cavity and the gearbox cavity, wherein one end of the bottom oil circuit is connected to the corresponding oil inlet, and the other end is connected to the corresponding oil outlet; Among them, when the electric drive system is in a horizontal state, the heights of all the oil inlets are not lower than the height of any of the oil outlets, and the oil inlets connected to the bottom oil circuit are arranged circumferentially at the bottom of the motor housing, so that when the electric drive system is in a first preset slope state, the oil in the motor cavity can flow back into the gearbox cavity.

2. The electric drive system according to claim 1, wherein: The motor housing and the gearbox housing are integrally formed.

3. The electric drive system according to claim 2, wherein: The bottom oil passage is arranged on the motor housing to form a bottom oil passage; and / or, The motor housing has a partition wall separating the motor cavity and the gearbox cavity, the bottom oil passage is arranged on the partition wall to form an oil return port, and the oil return port is arranged circumferentially on the partition wall.

4. The electric drive system according to claim 3, wherein: The electric drive system includes a first control valve, which is fixed to the partition wall and is used to control the opening and closing of the bottom oil circuit; When the electric drive system is in a horizontal state, the first control valve is in an open state; when the electric drive system is in a second preset slope state, the first control valve is in a closed state.

5. The electric drive system according to claim 4, wherein: The first control valve is a movable baffle, and the orthographic projection of the movable baffle covers the oil outlet connected to the bottom oil circuit.

6. The electric drive system according to claim 5, wherein: The gearbox housing includes a step wall, which is located below the bottom oil channel. The step wall includes an inclined wall, which is located in the oil outlet direction of the oil outlet connected to the bottom oil channel. When the electric drive system is in a second preset slope state, the movable baffle can fit with the inclined wall.

7. The electric drive system according to claim 3, wherein: The cross-sectional shape of the bottom oil passage or the oil return port is a sector ring.

8. The electric drive system according to claim 1, wherein: The electric drive system also includes a bypass oil circuit, which is arranged outside the motor housing, and the bypass oil circuit connects the motor cavity and the gearbox cavity. One end of each bypass oil circuit is connected to the corresponding oil inlet, and the other end is connected to the corresponding oil outlet.

9. The electric drive system according to claim 8, wherein: The gearbox comprises an input shaft and an output shaft, the input shaft and the output shaft have a height difference, and when the electric drive system is in a horizontal state, a line connecting the oil inlet and the oil outlet connected by the bypass oil circuit is arranged at an angle to a horizontal plane; and / or, The motor comprises a reinforcing plate, one side of the reinforcing plate is connected to the outside of the gearbox housing, and the other side is connected to the outside of the motor housing. The bypass oil passage is arranged in the reinforcing plate to form a bypass oil passage.

10. The electric drive system according to claim 9, wherein: The motor includes a second control valve, which is arranged in the reinforcement plate and connected to the bypass oil channel. When the bypass oil channel is tilted and the connected oil outlet is higher than the connected oil inlet, the second control valve cuts off the bypass oil channel.

11. The electric drive system according to claim 8, wherein: The gearbox housing includes an oil baffle rib, and the gearbox cavity includes a gear cavity and an oil suction cavity, the gear cavity and the oil suction cavity are separated by the oil baffle rib, the oil outlet connected to the bypass oil circuit is connected to the gear cavity, and the oil outlet connected to the bottom oil circuit is connected to the oil suction cavity.

12. An electrically driven vehicle, wherein: The electrically driven vehicle comprises the electrically driven system according to any one of claims 1-11.

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