Power assembly and electric vehicle

Abstract

The invention provides a power assembly and an electric vehicle, and relates to the technical field of electric vehicles, the power assembly comprises a motor cavity, a speed reducer cavity and a dry type oil storage cavity, and the dry type oil storage cavity is used for storing oil flowing out of the motor cavity and the speed reducer cavity under the action of gravity. The dry type oil storage cavity comprises a motor oil storage cavity and a speed reducer oil storage cavity which are communicated in the axial direction of the driving motor, the motor cavity and the speed reducer cavity are distributed adjacently in the axial direction of the driving motor, and the motor oil storage cavity and the motor cavity are distributed adjacently in the radial direction of the driving motor and directly communicated in the radial direction of the driving motor. The speed reducer oil storage cavity and the speed reducer cavity are adjacently distributed in the radial direction of the driving motor and directly communicate with each other in the radial direction of the driving motor, so that oil is not accumulated in the motor cavity and the speed reducer cavity, an air gap between a rotor and a stator is prevented from being immersed by the oil, oil stirring of a gear of the planetary speed reducer is prevented, oil stirring loss of a power assembly is effectively reduced, and the service life of the power assembly is prolonged. And the efficiency of the power assembly is improved.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and in particular to a powertrain and an electric vehicle. Background Technology

[0002] The powertrain includes a drive motor and a reducer. To ensure the normal operation of the powertrain, oil needs to be stored inside the powertrain housing. An oil pump pumps the oil stored in the powertrain housing into the internal flow channels of the housing, allowing the oil to cool and lubricate the drive motor and reducer. However, if the oil accumulates inside the drive motor housing after cooling it, it will submerge the air gap between the stator and rotor of the drive motor, increasing the wear and tear on the drive motor. In addition, if the oil accumulates inside the reducer housing after cooling and lubricating it, it will submerge the gears of the reducer, causing oil churning losses and resulting in low efficiency of the powertrain. Summary of the Invention

[0003] This application provides a powertrain and an electric vehicle that reduces oil churning losses and improves powertrain efficiency by using a dry oil reservoir.

[0004] In a first aspect, this application provides a powertrain comprising a motor cavity, a reducer cavity, and a dry oil reservoir. The motor cavity houses the stator and rotor of a drive motor, the reducer cavity houses a planetary reducer, the drive motor drives the wheels of an electric vehicle via the planetary reducer, and the dry oil reservoir stores oil flowing out of the motor cavity and reducer cavity under gravity. The dry oil reservoir includes a motor oil reservoir and a reducer oil reservoir. The motor cavity and reducer cavity are adjacent along the axial direction of the drive motor, adjacent along the radial direction of the drive motor, adjacent along the radial direction of the reducer oil reservoir and reducer cavity, directly connected along the radial direction of the drive motor, and connected along the axial direction of the drive motor.

[0005] In this embodiment, the motor oil reservoir and the motor cavity are arranged radially spaced apart along the drive motor and directly connected radially. Similarly, the reducer oil reservoir and the reducer cavity are arranged radially spaced apart along the drive motor and directly connected radially. This allows the oil entering the motor cavity and the reducer cavity to flow into their respective reservoirs for storage, preventing oil accumulation and thus preventing oil churning during rotation of the drive motor rotor and planetary reducer gear set. This effectively reduces oil churning losses in the powertrain and improves its efficiency. Furthermore, connecting the reducer oil reservoir and the motor oil reservoir axially along the drive motor simplifies the structure of the dry oil reservoir in the powertrain, reducing costs.

[0006] In one embodiment, the motor cavity includes a first motor cavity and a second motor cavity, which are distributed along the axial direction of the drive motor on both sides of the stator of the drive motor. The first motor cavity and the second motor cavity are directly connected to the motor oil reservoir along the radial direction of the drive motor.

[0007] In this embodiment, the first and second motor cavities are distributed along the axial direction of the drive motor on both sides of the stator of the drive motor. The first and second motor cavities are directly connected to the motor oil reservoir along the radial direction of the drive motor, allowing oil from both sides of the stator to be directly input into the motor oil reservoir. This prevents oil accumulation in the motor cavities from submerging the air gap between the rotor and stator, thus improving the efficiency of the powertrain. Furthermore, the oil input to the first and second motor cavities can flow out separately into the motor oil reservoir, thereby increasing the rate at which oil flows from the motor cavities into the motor oil reservoir, improving the oil return efficiency of the powertrain, accelerating oil circulation in the powertrain, and ultimately enhancing the cooling effect of the powertrain.

[0008] In one embodiment, the reducer cavity includes a first reducer cavity and a second reducer cavity. The first reducer cavity is used to accommodate a first planetary gear set of the planetary reducer, and the second reducer cavity is used to accommodate a second planetary gear set of the planetary reducer. The first planetary gear set is used to drive the drive motor and the second planetary gear set. At least one of the first reducer cavity or the second reducer cavity is directly connected to the reducer oil reservoir cavity along the radial direction of the drive motor.

[0009] In this embodiment, the first reducer cavity is used to accommodate the first planetary gear set of the planetary reducer, and the second reducer cavity is used to accommodate the second planetary gear set of the planetary reducer. The first reducer cavity is directly connected to the reducer oil storage cavity along the radial direction of the drive motor, so that the oil input into the first reducer cavity does not accumulate in the first reducer cavity, preventing the first planetary gear set located in the first reducer cavity from churning, thereby reducing the churning loss of the planetary reducer and improving the efficiency of the powertrain.

[0010] In another embodiment, the second reducer chamber is directly connected to the reducer oil reservoir along the radial direction of the drive motor. This prevents the oil entering the second reducer chamber from accumulating within it, thus preventing churning of the second planetary gear set located within the second reducer chamber and reducing churning losses in the planetary reducer, which is beneficial for improving the efficiency of the powertrain.

[0011] In another embodiment, the first and second reducer chambers are directly connected to the reducer oil reservoir along the radial direction of the drive motor, so that the oil input into the first and second reducer chambers does not accumulate in the first and second reducer chambers, thereby preventing the first and second planetary gear sets from churning, reducing the churning loss of the planetary reducer, which is beneficial to reducing the churning loss of the powertrain and improving the efficiency of the powertrain.

[0012] In one embodiment, a first reducer cavity is arranged between the motor cavity and the second reducer cavity along the axial direction of the drive motor, and the reducer oil reservoir cavity and the first reducer cavity are directly connected along the radial direction of the drive motor.

[0013] In this embodiment, the first reducer cavity is used to accommodate the first planetary gear set of the planetary reducer, the second reducer cavity is used to accommodate the second planetary gear set of the planetary reducer, and the motor cavity is used to accommodate the rotor and stator of the drive motor. The first reducer cavity is arranged between the motor cavity and the second reducer cavity along the axial direction of the drive motor, which can facilitate the transmission connection between the first planetary gear set located in the first reducer cavity and the drive motor and the second planetary gear set.

[0014] In this embodiment, the oil reservoir of the reducer is directly connected to the first reducer cavity along the radial direction of the drive motor, so that the oil input into the first reducer cavity does not accumulate in the first reducer cavity, thereby preventing the first planetary gear set located in the first reducer cavity from churning, thus reducing the churning loss of the planetary reducer and improving the efficiency of the powertrain.

[0015] In one embodiment, the length of the reducer oil reservoir along the axial direction of the drive motor is less than or equal to the length of the reducer cavity. One end of the reducer oil reservoir is flush with one end of the reducer cavity. One end of the reducer oil reservoir is used to connect to the motor oil reservoir along the axial direction of the drive motor, and the other end of the reducer oil reservoir is used to directly connect to the first section of the reducer cavity along the radial direction of the drive motor.

[0016] In this embodiment, the length of the reducer oil reservoir along the drive motor axis is less than or equal to the length of the reducer cavity. One end of the reducer oil reservoir is flush with one end of the reducer cavity. The shorter length of the reducer oil reservoir along the drive motor axis ensures that the reducer oil reservoir does not additionally occupy the axial dimension of the reducer cavity along the drive motor axis, which is beneficial for minimizing the axial dimension of the powertrain. The longer length of the reducer cavity allows for sufficient axial space within the reducer cavity to accommodate the first and second planetary gear sets of the planetary reducer.

[0017] In this embodiment, one end of the reducer oil reservoir is used to connect to the motor oil reservoir along the axial direction of the drive motor, and the other end of the reducer oil reservoir is used to directly connect to the first section of the reducer cavity along the radial direction of the drive motor. This allows the oil collected in the first section of the reducer cavity to flow rapidly into the other end of the reducer oil reservoir along the radial direction of the drive motor under the action of gravity. From the other end of the reducer oil reservoir, the oil flows sequentially into the first end of the reducer oil reservoir and the motor oil reservoir along the axial direction of the drive motor. This prevents the oil from accumulating in the first section of the reducer cavity, thus preventing the first planetary gear set located in the first section of the reducer cavity from churning, effectively reducing the churning loss of the powertrain and improving the efficiency of the powertrain.

[0018] In one embodiment, the length of the reducer oil reservoir along the axial direction of the drive motor is less than or equal to the length of the first reducer cavity.

[0019] In this embodiment, the length of the reducer oil reservoir along the axial direction of the drive motor is relatively small, which allows the oil received from the first section of the reducer cavity to flow more quickly from one end of the reducer oil reservoir to the other end, and then quickly flow into the motor oil reservoir. This is beneficial to improving the oil return efficiency of the powertrain and accelerating the oil circulation in the powertrain, thereby improving the cooling efficiency of the powertrain.

[0020] In one embodiment, the first reducer cavity and the second reducer cavity are directly connected along the axial direction of the drive motor. The inner diameter of the first reducer cavity is larger than the inner diameter of the second reducer cavity. The reducer oil storage cavity is used to receive the oil flowing from the second reducer cavity into the first reducer cavity under the action of gravity through the first reducer cavity.

[0021] In this embodiment, the inner diameter of the first reducer cavity is larger than that of the second reducer cavity. The first reducer cavity and the second reducer cavity are directly connected along the axial direction of the drive motor. The larger inner diameter of the first reducer cavity means that the cavity wall of the first reducer cavity is farther from the axis of the drive motor than the cavity wall of the second reducer cavity. This facilitates the flow of oil from the second reducer cavity into the first reducer cavity under gravity, and then into the reducer oil storage chamber through the first reducer cavity. This prevents the oil from accumulating in the second reducer cavity, thereby preventing the second planetary gear set located in the second reducer cavity from churning, effectively reducing the oil churning loss of the powertrain, and improving the efficiency of the powertrain.

[0022] In one embodiment, the cavity wall of the second reducer cavity further includes a plurality of oil guide grooves, which are distributed at intervals along the circumference of the drive motor. The end of each oil guide groove facing the first reducer cavity is used to directly connect to the first reducer cavity along the axial direction of the drive motor.

[0023] In this embodiment, the cavity wall of the second reducer cavity further includes multiple oil guide grooves. These grooves are spaced apart circumferentially along the drive motor. One end of each groove facing the first reducer cavity is used to directly connect to the first reducer cavity along the axial direction of the drive motor. This facilitates the collection of oil that hits the cavity wall of the second reducer cavity when it enters the second reducer cavity. The oil is then guided back to the first reducer cavity through the multiple oil guide grooves, which helps to accelerate the flow of oil from the second reducer cavity into the first reducer cavity. This also helps to prevent oil accumulation in the second reducer cavity and prevents the second planetary gear set located in the second reducer cavity from churning, thereby effectively reducing the churning loss of the powertrain and improving the efficiency of the powertrain.

[0024] In one embodiment, the cavity wall of the second reducer cavity includes a mounting groove for fixing the gear ring of the second planetary gear set. The mounting groove includes multiple grooves, each groove for accommodating the embedding of the gear ring in the second planetary gear set. The multiple grooves are distributed at intervals along the circumference of the drive motor. At least one of the adjacent grooves has a radial depth greater than the radial depth of the other grooves along the drive motor.

[0025] In this embodiment, at least one of the adjacent grooves has a greater radial depth than the other grooves along the drive motor. This larger radial depth of at least one groove in the adjacent grooves allows at least one groove in the grooves used for mounting the ring gear of the second planetary gear set to also collect oil from the second reducer chamber. This prevents oil from accumulating at the meshing point between the mounting groove and the ring gear, thus preventing oil churning when the planetary gears of the second planetary gear set mesh with the ring gear. This helps reduce oil churning losses in the planetary reducer, which in turn helps reduce oil churning losses in the powertrain and improves the efficiency of the powertrain.

[0026] In one embodiment, the oil guide groove and the mounting groove are distributed adjacent to each other along the axial direction of the drive motor.

[0027] In this embodiment, the mounting groove is used to fix the gear ring of the second planetary gear set. The oil guide groove and the mounting groove are arranged adjacent to each other along the axial direction of the drive motor. This facilitates the collection of oil from the meshing rotation between the planetary gears and the gear ring of the second planetary gear set by the oil guide groove. As a result, the oil used to lubricate the gears of the second planetary gear set can be collected and guided into the first stage reducer cavity more quickly through the oil guide groove, and then guided into the reducer oil storage cavity through the first stage reducer cavity. This avoids the accumulation of oil in the second stage reducer cavity, reduces the churning loss of the second planetary gear set, reduces the churning loss of the powertrain, and improves the efficiency of the powertrain.

[0028] In one embodiment, the reducer cavity further includes a third reducer cavity, which is distributed on both sides of the second reducer cavity along with the first reducer cavity. The inner diameter of the second reducer cavity is larger than the inner diameter of the third reducer cavity. The cavity wall of the third reducer cavity includes an oil collection groove. The distance between one end of the oil collection groove and the axis of the drive motor is smaller than the distance between the other end of the oil collection groove and the axis of the drive motor. Under the action of gravity, the oil in the oil collection groove flows from one end of the oil collection groove to the other end.

[0029] In this embodiment, the inner diameter of the second reducer cavity is larger than that of the third reducer cavity. The larger inner diameter of the second reducer cavity means that the cavity wall of the second reducer cavity is farther from the axis of the drive motor than the cavity wall of the third reducer cavity. This facilitates the flow of oil from the third reducer cavity into the second reducer cavity under the action of gravity, and then into the reducer oil storage cavity through the first reducer cavity. This prevents the oil from accumulating in the third reducer cavity, thus preventing the oil from accumulating and flowing into the first and second reducer cavities, which would cause the first and second planetary gear sets to churn. This helps reduce the churning loss of the planetary reducer and improve the efficiency of the powertrain.

[0030] In this embodiment, the cavity wall of the third reducer cavity includes an oil collection groove, allowing the oil in the third reducer cavity to be collected through the oil collection groove. The distance between one end of the oil collection groove and the axis of the drive motor is smaller than the distance between the other end of the oil collection groove and the axis of the drive motor. This smaller distance allows the oil collected in the oil collection groove to flow from one end to the other end under gravity, and then sequentially into the second reducer cavity, the first reducer cavity, and the reducer oil storage cavity. This helps reduce power loss in the powertrain and makes the oil collection and storage process smoother.

[0031] In one embodiment, one end of a groove with a greater depth than the others is connected to an oil collection groove, and the other end is connected to an oil guide groove. This allows the oil collected in the third section of the reducer cavity to flow sequentially through one end of a groove, the other end of a groove, and the oil guide groove into the first section of the reducer cavity, and then out to the reducer oil reservoir. This ensures that the oil in the first, second, and third sections of the reducer cavity can flow smoothly into the reducer oil reservoir, preventing oil accumulation at the bottom of the reducer cavity, thereby reducing the churning loss of the planetary reducer, effectively reducing the churning loss of the powertrain, and improving the efficiency of the powertrain.

[0032] In one embodiment, the powertrain housing includes a motor housing, a partition plate, and a reducer housing. The two sides of the partition plate are respectively used to mate with the mounting surfaces of the motor housing and the reducer housing. The motor housing includes a motor slot and a motor oil return slot. The slot openings of the motor slot and the motor oil return slot face the same direction. The slot openings are used to assemble the stator and rotor of the drive motor. The partition plate surrounds the slot openings to form a motor cavity. The reducer housing includes a reducer slot and a reducer oil return slot. The slot openings of the reducer slot and the reducer oil return slot face the same direction. The slot openings of the reducer slot are used to assemble the gear set of a planetary reducer. The partition plate surrounds the slot openings to form a reducer cavity. The partition plate also includes a connecting hole for connecting the slot openings of the motor oil return slot and the reducer oil return slot along the axial direction of the drive motor to form a dry oil reservoir.

[0033] In this embodiment, the two sides of the partition plate are respectively used to fit the mounting surface of the motor housing and the mounting surface of the reducer housing, so as to facilitate the installation and disassembly of the motor housing, the partition plate and the motor housing.

[0034] In this embodiment, the opening orientation of the motor slot is the same as that of the motor oil return slot, facilitating the forming of the motor slot and the motor oil return slot from the same direction and simplifying the processing technology. Similarly, the opening orientation of the reducer slot is the same as that of the reducer oil return slot, facilitating the forming of the reducer slot and the reducer oil return slot from the same direction and simplifying the processing technology.

[0035] In this embodiment, the partition plate is used to enclose the slot of the motor slot to form a motor cavity, and the partition plate is used to enclose the slot of the reducer slot to form a reducer cavity. This makes the motor cavity and the reducer cavity arranged adjacent to each other along the axial direction of the drive motor, ensuring the functional independence of the motor cavity and the reducer cavity, which is more conducive to protecting the drive motor and the planetary reducer and improving the reliability of the powertrain.

[0036] In this embodiment, the partition plate further includes a connecting hole, which is used to connect the slot of the motor oil return groove and the slot of the reducer oil return groove along the axial direction of the drive motor to form a dry oil storage chamber. This allows the dry oil storage chamber to be formed by the motor oil return groove located in the motor housing, the connecting hole of the partition plate, and the reducer oil return groove in the reducer housing. This allows the dry oil storage chamber to be formed in sections using a split structure, making the shell structure for forming the dry oil storage chamber simpler and helping to reduce the assembly difficulty and production cost of the dry oil storage chamber.

[0037] In one embodiment, the motor housing includes a first radial through hole and a second radial through hole. The first radial through hole and the second radial through hole are respectively used to penetrate the common housing portion of the motor slot and the motor oil return slot along the radial direction of the drive motor. The distance between the first radial through hole and the second radial through hole along the axial direction of the drive motor is greater than the axial dimension of the stator of the drive motor and less than the length of the motor oil return slot. The common housing portion of the motor slot and the motor oil return slot includes a notch. A partition plate is used to enclose the notch to form the second radial through hole.

[0038] In this embodiment, the first radial through hole and the second radial through hole are respectively used to penetrate the common housing portion of the motor slot and the motor oil return slot along the radial direction of the drive motor, so that the motor slot and the motor oil return slot can be connected through the first radial through hole and the second radial through hole. This allows the oil in the motor slot to flow into the dry oil storage chamber formed by the motor oil return slot under the action of gravity. This avoids the accumulation of oil in the motor slot and prevents the rotor and stator of the drive motor from being immersed in oil, which helps to reduce the oil churning loss of the drive motor and improve the efficiency of the powertrain.

[0039] In this embodiment of the application, the distance between the first radial through hole and the second radial through hole along the axial direction of the drive motor is greater than the axial dimension of the stator of the drive motor. The large distance between the first radial through hole and the second radial through hole along the axial direction of the drive motor ensures that the first radial through hole and the second radial through hole are not blocked by the stator of the drive motor, allowing the oil in the motor slot to flow smoothly into the motor return oil slot.

[0040] In this embodiment, the distance between the first radial through hole and the second radial through hole along the axial direction of the drive motor is less than the length of the motor oil return groove. The smaller distance between the first and second radial through holes along the axial direction of the drive motor allows the oil output from the first and second radial through holes to be received by the motor oil return groove. The larger length of the motor oil return groove ensures that its axial dimension is sufficiently large, further facilitating the receipt of oil output from the first and second radial through holes.

[0041] In this embodiment, the common housing portion of the motor slot and the motor oil return slot includes a notch, and a partition plate is used to enclose the notch to form a second radial through hole. This allows the formation of the second radial through hole to save material in the motor housing and also allows the second radial through hole to be closer to the slot opening of the motor slot, facilitating the flow of oil output from the second section of the motor cavity.

[0042] In one embodiment, the reducer housing includes a third radial through hole that extends radially through a common housing portion of the reducer slot and the reducer oil return slot of the drive motor. The distance between the third radial through hole and the slot opening of the reducer slot along the axial direction of the drive motor is less than the length of the reducer oil return slot.

[0043] In this embodiment, the third radial through hole penetrates the common housing portion of the reducer slot and the reducer return oil slot along the radial direction of the drive motor, so that the oil in the reducer slot can flow into the dry oil storage chamber formed by the reducer return oil slot under the action of gravity through the third radial through hole. This can prevent the oil from accumulating in the reducer slot, reduce the oil churning loss of the planetary reducer, thereby reducing the oil churning loss of the powertrain and improving the efficiency of the powertrain.

[0044] In this embodiment, the distance between the third radial through hole along the axial direction of the drive motor and the slot opening of the reducer groove is less than the length of the reducer oil return groove. The smaller distance between the third radial through hole and the slot opening of the reducer groove allows the oil output from the third radial through hole to be received by the reducer oil return groove. The larger length of the reducer oil return groove ensures that it is sufficiently long to facilitate the receiving of the oil output from the third radial through hole.

[0045] In one embodiment, the oil return groove of the motor includes a first groove wall and a second groove wall, which are spaced apart circumferentially along the drive motor. The first groove wall includes a fixing structure for fixing a magnet, which is used to attract impurities in the oil. The second groove wall includes an oil suction pipe and an oil suction hole. The oil suction pipe is used to connect to the oil pump of the powertrain, and its extension direction is parallel to the oil return groove of the motor. The extension direction of the oil suction hole is perpendicular to the oil suction pipe.

[0046] In this embodiment, the first section of the tank wall includes a fixing structure for fixing a magnet. The magnet is used to adsorb impurities in the oil, thereby increasing the cleanliness of the oil transported from the motor return oil tank to the motor cavity or reducer cavity. This helps prevent impurities in the oil from clogging the oil passages of the housing. It also helps reduce the wear and tear on the drive motor and planetary reducer caused by impurities in the oil when sprayed onto them, extending the service life of the components.

[0047] In this embodiment of the application, the second section of the tank wall includes an oil suction pipe and an oil suction hole. The oil suction pipe is used to connect to the oil pump of the powertrain, so that the oil in the motor return oil tank can be transported to the oil pump through the oil suction hole and the oil suction pipe, and then pumped into the housing of the powertrain by the oil pump.

[0048] In this embodiment, the oil suction pipe extends parallel to the motor oil return groove, so that the oil suction pipe can be arranged using the axial length space of the motor oil return groove without occupying too much space of the motor housing.

[0049] In this embodiment, the extension direction of the oil suction hole is perpendicular to the oil suction pipe, so that the oil suction hole can guide the oil into the oil suction pipe with the shortest path. This helps to speed up the output of the oil from the dry oil storage chamber to the housing of the powertrain, and allows the oil to be delivered to the motor chamber and the reducer chamber more quickly, which cools and lubricates the drive motor and planetary reducer, thereby improving the cooling efficiency of the powertrain.

[0050] In one embodiment, the wall of at least one of the motor oil return tank or the reducer oil return tank includes an oil guiding structure, which is used to allow the oil stored in the motor oil return tank to flow toward the opening of the motor oil return tank under the action of gravity or to allow the oil stored in the reducer oil return tank to flow toward the opening of the reducer oil return tank under the action of gravity.

[0051] In this embodiment, the wall of the motor oil return tank includes an oil guiding structure. This structure allows the oil stored in the motor oil return tank to flow towards the tank opening under gravity, facilitating the pumping of the oil from near the tank opening into the oil passages of the powertrain housing. It also facilitates the flow of oil within the tank, preventing accumulation at the receiving position of the motor oil tank's output oil, thus accelerating oil flow and promoting oil circulation in the powertrain.

[0052] In one embodiment, the wall of the reducer return oil tank includes an oil guiding structure. The oil guiding structure is used to allow the oil stored in the reducer return oil tank to flow towards the opening of the reducer return oil tank under the action of gravity, so that the oil in the reducer return oil tank does not accumulate at the position where the oil output from the reducer tank is received, thereby accelerating the flow of oil in the reducer return oil tank and thus promoting the oil circulation of the powertrain.

[0053] In one embodiment, the walls of both the motor oil return groove and the reducer oil return groove include oil guiding structures. The oil guiding structures are used to allow the oil stored in the motor oil return groove to flow towards the opening of the motor oil return groove under the action of gravity. The oil guiding structures are also used to allow the oil stored in the reducer oil return groove to flow towards the opening of the reducer oil return groove under the action of gravity, thereby facilitating the flow of oil in the motor oil return groove and the reducer oil return groove and promoting the oil circulation of the powertrain.

[0054] In one embodiment, the magnet fixed by the fixing structure of the first section of the groove wall and the oil suction hole of the second section of the groove wall are arranged close to the groove opening of the motor return oil groove, so that the oil in the motor return oil groove can be removed by the magnet, improving the cleanliness of the oil. This helps to prevent impurities from blocking the oil suction hole when the oil is sucked in by the oil pump, so that the oil can be smoothly sent from the dry oil storage chamber into the oil circuit of the powertrain housing.

[0055] In one embodiment, the distance between one end of the oil guide structure of the motor return oil groove along the radial direction of the drive motor and the axis of the drive motor is less than the distance between the other end of the oil guide structure and the axis of the drive motor. Under the action of gravity, the oil in the motor return oil groove flows from one end of the oil guide structure to the other end of the oil guide structure. The other end of the oil guide structure is close to the groove opening of the motor return oil groove. The oil suction holes are arranged along the axial direction of the drive motor on the side of the other end of the oil guide structure close to the groove opening of the motor return oil groove, so that the oil suction holes can be located at the lowest point of the oil in the motor return oil groove. This allows the oil suction holes to be submerged in the oil when the electric vehicle tilts while climbing a slope, thereby preventing the oil pump from sucking dry and ensuring the normal operation of the powertrain.

[0056] In one embodiment, one end of the oil guide structure in the radial oil return groove of the drive motor is arranged opposite to the first radial through hole. Under the action of gravity, the oil in the motor groove flows from the first radial through hole into the oil return groove and is directly transported to one end of the oil guide structure. Then, under the action of gravity, it flows from one end of the oil guide structure to the other end of the oil guide structure, and is then transported back into the oil passage of the powertrain housing through the oil suction hole near the other end of the oil guide structure. This can prevent the oil in the motor oil return groove from accumulating at the position opposite to the first radial through hole, accelerate the flow rate of the oil in the motor oil return groove, and improve the oil circulation rate in the powertrain, thereby improving the cooling efficiency of the powertrain.

[0057] In one embodiment, the distance between one end of the oil guide structure of the reducer return oil groove along the radial direction of the drive motor and the axis of the drive motor is less than the distance between the other end of the oil guide structure and the axis of the drive motor. Under the action of gravity, the oil in the reducer return oil groove flows from one end of the oil guide structure to the other end of the oil guide structure. The other end of the oil guide structure is close to the groove opening of the reducer return oil groove. One end of the oil guide structure in the reducer return oil groove along the radial direction of the drive motor is arranged opposite to the third radial through hole. Under the action of gravity, the oil in the reducer groove flows into the reducer return oil groove from the third radial through hole and is directly transported to one end of the oil guide structure. Then, under the action of gravity, it flows from one end of the oil guide structure to the other end of the oil guide structure, and then flows into the motor return oil groove more quickly through the connecting hole of the partition plate. The oil is then transported back into the oil circuit of the powertrain housing through the oil suction hole in the motor return oil groove, which helps to improve the oil circulation rate in the powertrain, thereby improving the cooling efficiency of the powertrain.

[0058] Secondly, this application provides an electric vehicle, which includes wheels and a powertrain as described in the first aspect, the powertrain being used to drive the wheels.

[0059] In the powertrain of this embodiment, the motor oil reservoir and motor cavity are arranged radially spaced apart along the drive motor and directly connected radially. Similarly, the reducer oil reservoir and reducer cavity are arranged radially spaced apart along the drive motor and directly connected radially. This allows the oil entering the motor cavity and reducer cavity to flow into their respective oil reservoirs for storage, preventing oil accumulation and turbulence during rotation of the drive motor rotor and planetary reducer gears. This effectively reduces oil turbulence losses and improves powertrain efficiency. Furthermore, connecting the reducer oil reservoir and motor oil reservoir axially along the drive motor simplifies the dry oil reservoir structure of the powertrain, reducing costs. Attached Figure Description

[0060] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0061] Figure 1 This is a schematic diagram of an electric vehicle provided in an embodiment of this application; Figure 2 This is a schematic diagram of a powertrain provided in an embodiment of this application; Figure 3 This is another schematic diagram of the powertrain provided in the embodiments of this application; Figure 4 This is another schematic diagram of the powertrain provided in the embodiments of this application; Figure 5 yes Figure 4 A cross-sectional view of the powertrain along AA; Figure 6 This is a cross-sectional view of a powertrain provided in an embodiment of this application; Figure 7 This is an exploded view of a powertrain provided in an embodiment of this application; Figure 8 This is a schematic diagram of a motor housing provided in an embodiment of this application; Figure 9 yes Figure 5 A partial enlarged view of the M1 section of the powertrain; Figure 10 yes Figure 6 A close-up view of the M2 section of the powertrain; Figure 11 This is a cross-sectional view of the reducer housing provided in an embodiment of this application; Figure 12 yes Figure 5 A close-up view of the M3 section of the powertrain; Figure 13 yes Figure 4 A cross-sectional view of the powertrain along BB; Figure 14 This is a cross-sectional view of the housing of the powertrain provided in an embodiment of this application; Figure 15 This is a schematic diagram of the cavity wall of the reducer cavity provided in an embodiment of this application; Figure 16 This is a cross-sectional view of the cavity wall of the reducer cavity provided in an embodiment of this application; Figure 17 This is a schematic diagram of a motor housing provided in an embodiment of this application. Detailed Implementation

[0062] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0063] This application provides a powertrain including a motor cavity, a reducer cavity, and a dry oil reservoir. The motor cavity houses the stator and rotor of a drive motor, the reducer cavity houses a planetary reducer, the drive motor drives the wheels of an electric vehicle via the planetary reducer, and the dry oil reservoir stores oil flowing out of the motor cavity and reducer cavity under gravity. The dry oil reservoir also supplies oil to the powertrain's oil pump. Specifically, the dry oil reservoir includes a motor oil reservoir and a reducer oil reservoir. The motor cavity and reducer cavity are adjacent along the axial direction of the drive motor, and adjacent along the radial direction of the drive motor. The reducer oil reservoir and reducer cavity are also adjacent along the radial direction of the drive motor. The motor oil reservoir and motor cavity are directly connected along the radial direction of the drive motor, and the reducer oil reservoir and reducer cavity are also directly connected along the radial direction of the drive motor. Finally, the motor oil reservoir and reducer oil reservoir are connected along the axial direction of the drive motor.

[0064] The motor oil reservoir and motor cavity are arranged radially spaced together and directly connected radially. Similarly, the reducer oil reservoir and reducer cavity are arranged radially spaced together and directly connected radially. This allows the oil entering the motor cavity and reducer cavity to flow into their respective reservoirs for storage, preventing oil accumulation and submersion of the air gap between the stator and rotor. This also prevents oil churning during planetary gear reducer gear rotation, effectively reducing powertrain churning losses and improving powertrain efficiency. Furthermore, connecting the reducer oil reservoir and motor oil reservoir axially along the drive motor simplifies the dry oil reservoir structure of the powertrain, reducing costs.

[0065] This application provides a powertrain that is applied to an electric vehicle and improves the performance of the electric vehicle.

[0066] Figure 1 This is a schematic diagram of an electric vehicle 1 provided in an embodiment of this application.

[0067] In one embodiment, the electric vehicle 1 includes a powertrain 10, a frame 20, and a power battery 30, such as Figure 1 As shown, the frame 20 is used to fix the powertrain 10 and the power battery 30. In this embodiment, the electric vehicle 1 refers to a wheeled device driven or towed by a power unit. In this embodiment, the powertrain 10 is used to receive power from the power battery 30 to drive the wheels 40.

[0068] Figure 2 This is a schematic diagram of a powertrain 10 provided in an embodiment of this application. Figure 3 This is another schematic diagram of the powertrain 10 provided in the embodiments of this application. Figure 4This is another schematic diagram of the powertrain 10 provided in the embodiments of this application. Figure 5 yes Figure 4 A cross-sectional view of the powertrain 10 along AA.

[0069] In one embodiment, such as Figure 2 and Figure 3 As shown, the powertrain 10 includes a drive motor 11, a planetary reducer 12, and a motor controller 13.

[0070] In the embodiments of this application, such as Figure 4 and Figure 5 As shown, the drive motor 11 includes a stator 1101, a rotor 1102, and a motor shaft 1103, while the planetary reducer 12 includes a gear set (not shown). The motor controller 13 receives power from the power battery 30. The rotor 1102 of the drive motor 11 is fixedly mounted on the motor shaft 1103. After receiving current from the motor controller 13, the stator 1101 drives the rotor 1102 to rotate, thereby causing the motor shaft 1103 to rotate. The motor shaft 1103 of the drive motor 11 transmits kinetic energy to the gear set of the planetary reducer 12, and then transmits the power to the wheel 40 through the half-shaft, driving the wheel 40 to move. The gear set of the planetary reducer 12 includes a sun gear, planet gears, a planet carrier 1201, and a ring gear 1202.

[0071] The drive motor and planetary reducer of the powertrain require cooling and lubrication during operation. Usually, oil is circulated in the powertrain housing to cool and lubricate the drive motor and planetary reducer. However, if the oil accumulates in the drive motor housing after cooling it, it will submerge the air gap between the stator and rotor of the drive motor, increasing the wear and tear on the drive motor and increasing the risk of overheating and burning. In addition, if the oil accumulates in the planetary reducer housing after cooling and lubricating it, it will submerge the gears of the planetary reducer, causing oil churning losses and resulting in low powertrain efficiency.

[0072] This application arranges the motor oil reservoir and the motor cavity at intervals along the radial direction of the drive motor, and directly connects the motor oil reservoir and the motor cavity along the radial direction of the drive motor. Similarly, the reducer oil reservoir and the reducer cavity are arranged at intervals along the radial direction of the drive motor, and directly connect the reducer oil reservoir and the reducer cavity along the radial direction of the drive motor. This allows the oil input into the motor cavity and the reducer cavity to flow into the motor oil reservoir and the reducer oil reservoir respectively for storage, thus preventing oil accumulation in the motor cavity and reducer cavity. This prevents oil churning during the rotation of the drive motor rotor and the planetary reducer gears, effectively reducing oil churning losses in the powertrain and improving powertrain efficiency. Furthermore, connecting the reducer oil reservoir and the motor oil reservoir along the axial direction of the drive motor simplifies the structure of the dry oil reservoir in the powertrain, which is beneficial for cost reduction.

[0073] The powertrain 10 provided in the embodiments of this application will be described in detail below.

[0074] Figure 6 This is a cross-sectional view of the powertrain 10 provided in an embodiment of this application. Figure 7 This is an exploded view of the powertrain 10 provided in an embodiment of this application.

[0075] In one embodiment, such as Figure 5 and Figure 7 As shown, the powertrain 10 housing 10a includes a motor housing 100, a partition 200, and a reducer housing 300. The two sides 201 and 202 of the partition 200 are used to enclose the motor housing 100 and the reducer housing 300 to form a motor cavity 400 and a reducer cavity 500, respectively. The motor cavity 400 is used to accommodate the stator 1101 and rotor 1102 of the drive motor 11. The reducer cavity 500 is used to accommodate the planetary reducer 12 and the differential 14. The drive motor 11 is used to drive the planetary reducer 12 to drive the differential 14. The differential 14 is used to drive the wheels 40 of the electric vehicle 1 through the drive shaft 1203. The drive shaft 1203 is used to drive the differential 14 through the shaft cavity 1104 of the motor shaft 1103 of the drive motor 11.

[0076] In the embodiments of this application, the motor housing 100, the partition plate 200, and the reducer housing 300 of the powertrain 10 are detachable split structures.

[0077] In one embodiment, such as Figure 3 and Figure 4 As shown, the powertrain 10 also includes a heat exchanger 15, an oil pump 16, and an oil filter 17. The oil filter 17 is used to filter the oil output by the oil pump 16, and the heat exchanger 15 is used to exchange heat with the oil output by the oil filter 17 and to cool down the oil input into the heat exchanger 15.

[0078] In one embodiment, the housing 10a of the powertrain 10 includes multiple internal flow channels and multiple oil outlet holes. The multiple internal flow channels are used to receive oil output from the heat exchanger 15 and transport the oil to the multiple oil outlet holes. The oil is then transported to the motor cavity 400 and the reducer cavity 500 through the multiple oil outlet holes. This allows the drive motor 11 and the planetary reducer 12 to be cooled and lubricated through the oil passage of the housing 10a of the powertrain 10, which is more conducive to the directional cooling and lubrication of the drive motor 11 and the planetary reducer 12 and improves the cooling and lubrication efficiency of the powertrain 10.

[0079] In one embodiment, the powertrain 10 includes a dry oil reservoir 600, a motor cavity 400, and a reducer cavity 500. The dry oil reservoir 600 is arranged radially R apart from the drive motor 11. The oil in the motor cavity 400 and the reducer cavity 500 can flow into the dry oil reservoir 600 under the action of gravity, so that the oil does not accumulate in the motor cavity 400 and the reducer cavity 500. This can reduce the oil churning loss of the drive motor 11 and the planetary reducer 12, reduce the oil churning loss of the powertrain 10, and improve the efficiency of the powertrain 10.

[0080] Figure 8 This is a schematic diagram of a motor housing 100 provided in an embodiment of this application. Figure 9 yes Figure 5 A partial enlarged view of the M1 section of the powertrain 10. Figure 10 yes Figure 6 A close-up view of the M2 section of the powertrain 10. Figure 11 This is a cross-sectional view of the reducer housing 300 provided in an embodiment of this application.

[0081] In one embodiment, such as Figures 5 to 10 As shown, the motor housing 100 includes a first oil outlet 101, such as... Figure 6 , Figure 8 and Figure 10 As shown, the first oil outlet 101 is distributed on the inner wall 102 of the motor housing 100 facing the partition 200. The first oil outlet 101 is used to receive oil output from the heat exchanger 15 of the powertrain 10 through the first internal flow channel 103 of the motor housing 100. The oil output from the first oil outlet 101 is used to cool one side 1105 of the rotor 1102 of the drive motor 11. Figure 5 and Figure 9 As shown, the partition 200 includes a second oil outlet 203, which is distributed on one side 201 of the partition 200 facing the motor housing 100. The second oil outlet 203 is used to receive oil output from the heat exchanger 15 of the powertrain 10 through the second internal flow channel 104 of the motor housing 100. The oil output from the second oil outlet 203 is used to cool the other side 1106 of the rotor 1102 of the drive motor 11.

[0082] In the embodiments of this application, such as Figure 6 and Figure 10As shown, the first oil outlet 101 is distributed on the inner wall 102 of the motor housing 100 facing the partition plate 200. The first oil outlet 101 is used to receive the oil output from the heat exchanger 15 of the powertrain 10 through the first internal flow channel 103 of the motor housing 100. The oil output from the first oil outlet 101 is used to cool one side 1105 of the rotor 1102 of the drive motor 11. This allows the oil output from the heat exchanger 15 to be transported to the first oil outlet 101 through the first internal flow channel 103 of the motor housing 100. The oil is then directed to one side 1105 of the rotor 1102 of the drive motor 11 through the first oil outlet 101, thereby achieving direct and effective cooling of the rotor 1102 of the drive motor 11, improving the cooling effect of the drive motor 11, and thus improving the cooling effect of the powertrain 10.

[0083] In the embodiments of this application, such as Figure 5 and Figure 9 As shown, the second oil outlet 203 is distributed on the side 201 of the partition plate 200 facing the motor housing 100. The second oil outlet 203 is used to receive the oil output from the heat exchanger 15 of the powertrain 10 through the second internal flow channel 104 of the motor housing 100. The oil output from the second oil outlet 203 is used to cool the other side 1106 of the rotor 1102 of the drive motor 11, so that the oil can be transported to the second oil outlet 203 of the partition plate 200 through the second internal flow channel 104 of the motor housing 100, and the oil is directionally transported to the other side 1106 of the rotor 1102 of the drive motor 11 by the second oil outlet 203, thereby achieving direct and effective cooling of the rotor 1102 of the drive motor 11. In one embodiment, the second internal flow channel 104 of the motor housing 100 delivers oil to the internal flow channel 205 of the partition plate 200 through the internal flow channel 301 of the reducer housing 300, and then delivers the oil to the second oil outlet 203 through the internal flow channel 205 of the partition plate 200. In another embodiment, the second internal flow channel 104 of the motor housing 100 directly inputs oil into the internal flow channel 205 of the partition plate 200, and the internal flow channel 205 of the partition plate 200 delivers the oil to the second oil outlet 203.

[0084] In this embodiment, the first internal flow channel 103 of the motor housing 100 receives the oil output from the heat exchanger 15 and delivers it to the first oil outlet 101 to cool one side 1105 of the rotor 1102 of the drive motor 11. The second internal flow channel 104 of the motor housing 100 receives the oil output from the heat exchanger 15 and delivers it to the second oil outlet 203 of the partition plate 200 to cool the other side 1106 of the rotor 1102 of the drive motor 11. This allows for directional oil delivery to the rotor 1102 of the drive motor 11 directly through the oil passage of the housing 10a of the powertrain 10, enabling direct and effective cooling of the rotor 1102 of the drive motor 11. This results in better cooling of the rotor 1102 of the drive motor 11, which in turn improves the cooling effect of the drive motor 11 and, consequently, the cooling effect of the powertrain 10.

[0085] In this embodiment, the rotor 1102 of the drive motor 11 is cooled directly by the oil passage of the housing 10a of the powertrain 10. Compared to cooling the rotor 1102 by supplying oil through the shaft cavity 1104 of the motor shaft 1103 and then through the oil hole of the motor shaft 1103, this solution directly supplies oil to the rotor 1102 through the oil passage of the housing 10a, which reduces the manufacturing cost of the oil passage. In addition, compared to supplying oil to the rotor 1102 through the shaft cavity 1104 of the motor shaft 1103, drag losses can also be reduced.

[0086] in, Figure 7 and Figure 8 The heat exchanger 15 in the diagram only represents the schematic location of the heat exchanger 15; for the specific structure, please refer to [link / reference]. Figure 3 .

[0087] In one embodiment, such as Figure 5 and Figure 6 As shown, the extension direction of the first internal flow channel 103 of the motor housing 100 is parallel to the radial direction R of the drive motor 11, the extension direction of the second internal flow channel 104 of the motor housing 100 is parallel to the axial direction O of the drive motor 11, the extension direction of the first oil outlet 101 is parallel to the axial direction O of the drive motor 11, the extension direction of the second oil outlet 203 is parallel to the axial direction O of the drive motor 11, the flow direction of the oil in the first oil outlet 101 is opposite to the flow direction of the oil in the second oil outlet 203, and the flow direction of the oil in the first oil outlet 101 is the same as the flow direction of the oil in the second internal flow channel 104 of the motor housing 100.

[0088] In the embodiments of this application, such as Figure 6As shown, the first oil outlet 101 is distributed on the inner wall 102 of the motor housing 100 facing the partition plate 200. The extension direction of the first internal flow channel 103 of the motor housing 100 is parallel to the radial direction R of the drive motor 11, which makes the length of the first internal flow channel 103 of the motor housing 100 relatively short. This allows the first internal flow channel 103 of the motor housing 100 to deliver the oil output from the heat exchanger 15 to the first oil outlet 101 more quickly, thereby improving the efficiency of the oil output from the first oil outlet 101 to cool one side 1105 of the rotor 1102 of the drive motor 11.

[0089] In the embodiments of this application, such as Figure 5 As shown, the extension direction of the second internal flow channel 104 of the motor housing 100 is parallel to the axial direction O of the drive motor 11, which makes the length of the second internal flow channel 104 of the motor housing 100 shorter. This allows the second internal flow channel 104 of the motor housing 100 to deliver the oil output from the heat exchanger 15 to the second oil outlet 203 more quickly, thereby improving the efficiency of the oil output from the second oil outlet 203 to cool the other side 1106 of the rotor 1102 of the drive motor 11.

[0090] In the embodiments of this application, such as Figure 6 As shown, the extension direction of the first oil outlet 101 is parallel to the axial direction O of the drive motor 11. This facilitates the delivery of oil from the first oil outlet 101 to a position further away from its opening along the axial direction O of the drive motor 11, thus enabling the first oil outlet 101 to deliver oil to one side 1105 of the rotor 1102 of the drive motor 11. Similarly, the extension direction of the second oil outlet 203 is parallel to the axial direction O of the drive motor 11. This facilitates the delivery of oil from the second oil outlet 203 to a position further away from its opening along the axial direction O of the drive motor 11, thus enabling the second oil outlet 203 to deliver oil to the other side 1106 of the rotor 1102 of the drive motor 11.

[0091] In this embodiment, the flow direction of the oil in the first oil outlet 101 is opposite to that in the second oil outlet 203, so that the oil output from the first oil outlet 101 can be delivered to one side 1105 of the rotor 1102 of the drive motor 11, while the oil output from the second oil outlet 203 can be delivered to the other side 1106 of the rotor 1102 of the drive motor 11, thereby achieving cooling of the rotor 1102 on both sides 1105 and 1106, making the cooling of the rotor 1102 by the oil more uniform and effective.

[0092] In one embodiment, such as Figure 7 and Figure 8As shown, the motor housing 100 includes a heat exchanger oil inlet 105, which is used to receive the oil output from the heat exchanger 15. The extension direction of the heat exchanger oil inlet 105 is parallel to the extension direction of the first internal flow channel 103, and the extension direction of the heat exchanger oil inlet 105 is perpendicular to the extension direction of the second internal flow channel 104.

[0093] In this embodiment, the motor housing 100 includes a heat exchanger oil inlet 105, which is used to receive the oil output from the heat exchanger 15. This allows the first internal flow channel 103 and the second internal flow channel 104 of the motor housing 100 to receive the oil output from the heat exchanger 15 through the heat exchanger oil inlet 105. As a result, the oil can be directionally transported through the oil passage of the housing 10a of the powertrain 10 to the rotor 1102 of the drive motor 11 for cooling, which is beneficial to improving the cooling effect of the drive motor 11.

[0094] In the embodiments of this application, such as Figures 6 to 8 As shown, the extension direction of the heat exchanger oil inlet 105 is parallel to the radial direction R of the drive motor 11, so that the oil output from the heat exchanger 15 received by the heat exchanger oil inlet 105 can be more smoothly input into the first oil outlet 101 distributed on the inner wall 102 of the motor housing 100 facing the middle partition 200 along the radial direction R of the drive motor 11. This facilitates the faster output of oil from the first oil outlet 101 to cool one side 1105 of the rotor 1102 of the drive motor 11, thereby improving the cooling efficiency of the drive motor 11.

[0095] In the embodiments of this application, such as Figure 5 As shown, since the second internal flow channel 104 needs to transport oil to the second oil outlet 203 of the partition plate 200, the extension direction of the heat exchanger oil inlet 105 is perpendicular to the extension direction of the second internal flow channel 104. This makes it easier to make the length of the heat exchanger oil inlet 105 and the length of the second internal flow channel 104 shorter. This is beneficial for the oil input from the heat exchanger oil inlet 105 to reach the second oil outlet 203 of the partition plate 200 more quickly, so as to cool the other side 1106 of the rotor 1102 of the drive motor 11, which is beneficial to improving the cooling efficiency of the drive motor 11.

[0096] In one embodiment, such as Figure 5 and Figure 6 As shown, the motor housing 100 includes a first bearing groove 106, which is distributed on the inner wall 102 of the motor housing 100 facing the central partition 200, as shown. Figure 5 and Figure 9As shown, the partition 200 includes a second bearing groove 204, which is distributed on one side 201 of the partition 200 facing the motor housing 100. The first bearing groove 106 and the second bearing groove 204 are respectively used to fix the two bearings 1107 of the motor shaft 1103 of the drive motor 11, as shown. Figure 6 As shown, the first oil outlet 101 is distributed on the groove wall 106a of the first bearing groove 106, as... Figure 9 As shown, the second oil outlet 203 is distributed on the groove wall 204a of the second bearing groove 204.

[0097] In this embodiment, the first bearing groove 106 is distributed on the inner wall 102 of the motor housing 100 facing the partition plate 200, and the first oil outlet 101 is distributed on the groove wall 106a of the first bearing groove 106, so that the first oil outlet 101 can deliver oil into the motor cavity 400. The first oil outlet 101 is distributed on the groove wall 106a of the first bearing groove 106, so that the first oil outlet 101 can be arranged using the groove wall 106a of the first bearing groove 106. Since the first bearing groove 106 is used to fix the bearing 1107 of the motor shaft 1103 of the drive motor 11, the first bearing groove 106 can be arranged opposite to the rotor 1102 along the axial direction O of the drive motor 11. The first oil outlet 101 is distributed on the groove wall 106a of the first bearing groove 106, so that the first oil outlet 101 can be arranged opposite to one side 1105 of the rotor 1102 of the drive motor 11 along the axial direction O of the drive motor 11. Thus, the oil output from the first oil outlet 101 can be transported to one side 1105 of the rotor 1102 of the drive motor 11 to cool down the rotor 1102 of the drive motor 11.

[0098] In this embodiment, the second bearing groove 204 is distributed on the side 201 of the partition plate 200 facing the motor housing 100, and the second oil outlet 203 is distributed on the groove wall 204a of the second bearing groove 204, so that the second oil outlet 203 can deliver oil into the motor cavity 400. The second oil outlet 203 is distributed on the groove wall 204a of the second bearing groove 204, so that the second oil outlet 203 can be arranged using the groove wall 204a of the second bearing groove 204. Since the second bearing groove 204 is used to fix the bearing 1107 of the motor shaft 1103 of the drive motor 11, the second bearing groove 204 can be arranged opposite to the rotor 1102 along the axial direction O of the drive motor 11. The second oil outlet 203 is distributed on the groove wall 204a of the second bearing groove 204, so that the second oil outlet 203 can be arranged opposite to the other side 1106 of the rotor 1102 of the drive motor 11 along the axial direction O of the drive motor 11. Thus, the oil output from the second oil outlet 203 can be transported to the other side 1106 of the rotor 1102 of the drive motor 11 to cool down the rotor 1102 of the drive motor 11.

[0099] In one embodiment, such as Figure 6 and Figure 8 As shown, the first oil outlet 101 is used to directly connect to the first internal flow channel 103 to receive the oil output from the heat exchanger 15 through the first internal flow channel 103, such as... Figure 5 As shown, the second oil outlet 203 is used to directly connect to the internal flow channel 205 of the partition plate 200 to receive oil, and the internal flow channel 205 of the partition plate 200 is used to receive the oil output by the heat exchanger 15 through the second internal flow channel 104 through the internal flow channel 301 of the reducer housing 300.

[0100] In this embodiment, the first oil outlet 101 is used to directly connect to the first internal flow channel 103 to receive the oil output from the heat exchanger 15 through the first internal flow channel 103, so that the oil output from the heat exchanger 15 can be transported to the first oil outlet 101 more quickly through the first internal flow channel 103, and the first oil outlet 101 can transport the oil to one side 1105 of the rotor 1102 of the drive motor 11 more quickly, thereby improving the cooling efficiency of the rotor 1102 of the drive motor 11 and improving the cooling efficiency of the drive motor 11.

[0101] In the embodiments of this application, such as Figure 5 and Figure 7 As shown, the second oil outlet 203 is used to directly connect to the internal flow channel 205 of the partition plate 200 to receive oil. The internal flow channel 205 of the partition plate 200 is used to receive the oil output by the heat exchanger 15 through the second internal flow channel 104 via the internal flow channel 301 of the reducer housing 300. This allows the second oil outlet 203 to receive the oil transported from the second internal flow channel 104 of the motor housing 100 through the internal flow channel 301 of the reducer housing 300 and the internal flow channel 205 of the partition plate 200. This eliminates the need for the internal flow channel 205 of the partition plate 200 to be directly connected to the second internal flow channel 104 of the motor housing 100, thereby facilitating the connection between the mounting surface 107 of the motor housing 100 and the reducer housing 300. The partition 200 between the mounting surfaces 304 does not need to have an internal flow channel 205 for directly supplying oil to the second oil outlet 203. This is beneficial for reducing the axial dimension of the partition 200 exposed in the housing 10a of the powertrain 10, thereby reducing the axial dimension of the housing 10a occupied by the partition 200. This allows for the delivery of oil to the internal flow channel 205 of the partition 200 while reducing the axial length of the powertrain 10. Oil is then delivered to the other side 1106 of the rotor 1102 of the drive motor 11 through the internal flow channel 205 and the second oil outlet 203, achieving directional active cooling and lubrication of the rotor 1102 of the drive motor 11.

[0102] Figure 12 yes Figure 5A partial enlarged view of the M3 section of the powertrain 10.

[0103] In one embodiment, such as Figure 7 , Figure 11 and Figure 12 As shown, the first part 206 of the partition plate 200 is embedded in the slot 302 of the reducer housing 300. The inlets 205a of the internal flow channels 205 of the partition plate 200 are distributed on the outer peripheral surface 206a of the first part 206. The inlets 205a of the internal flow channels 205 of the partition plate 200 are used to directly receive the oil transmitted from the internal flow channels 301 of the reducer housing 300 from the oil outlet 303 on the inner wall of the reducer housing 300. Figure 9 As shown, the internal flow channel 205 of the partition 200 is used to deliver oil to the second oil outlet 203.

[0104] In this embodiment, the first part 206 of the partition plate 200 is embedded in the slot 302 of the reducer housing 300. The inlet 205a of the internal flow channel 205 of the partition plate 200 is distributed on the outer peripheral surface 206a of the first part 206. The inlet 205a of the internal flow channel 205 of the partition plate 200 is used to receive the oil transmitted from the internal flow channel 301 of the reducer housing 300 directly from the oil outlet 303 on the inner wall of the reducer housing 300. This allows the internal flow channel 301 of the reducer housing 300 and the internal flow channel 205 of the partition plate 200 to be directly connected when the partition plate 200 is assembled with the reducer housing 300, thus eliminating the need for additional seals, saving materials, simplifying the oil circuit structure of the housing 10a, and reducing the oil circuit manufacturing cost.

[0105] In the embodiments of this application, such as Figure 9 , Figure 11 and Figure 12 As shown, the oil outlet 303 of the internal flow channel 301 of the reducer housing 300 is located on the inner wall of the reducer housing 300. This allows the oil outlet 303 to not occupy additional space in the reducer cavity 500, which is beneficial for saving space and simplifying the structure. It also makes the path of the oil outlet 303 shorter, which can more quickly transport the oil in the internal flow channel 301 of the reducer housing 300 to the internal flow channel 205 of the partition plate 200. This allows the internal flow channel 205 of the partition plate 200 to transport the oil to the second oil outlet 203 more quickly. The second oil outlet 203 then transports the oil to the other side 1106 of the rotor 1102 of the drive motor 11 more quickly to cool down the rotor 1102 of the drive motor 11, thereby improving the cooling efficiency of the rotor 1102 of the drive motor 11.

[0106] In one embodiment, such as Figure 7 and Figure 12As shown, the second part 207 of the partition 200 is arranged between the mounting surface 107 of the motor housing 100 and the mounting surface 304 of the reducer housing 300. The side 201 of the partition 200 facing the motor housing 100 is used to fit the mounting surface 107 of the motor housing 100, and the side 202 of the partition 200 facing the reducer housing 300 is used to fit the mounting surface 304 of the reducer housing 300. The second part 207 includes a connecting hole 208, which is used to connect the two sides of the second part 207. The internal flow channel 301 of the reducer housing 300 is used to receive the oil output by the heat exchanger 15 through the second internal flow channel 104 through the connecting hole 208.

[0107] In the embodiments of this application, such as Figure 7 , Figure 8 and Figure 12 As shown, the second portion 207 of the partition plate 200 is arranged between the mounting surface 107 of the motor housing 100 and the mounting surface 304 of the reducer housing 300. The second portion 207 includes a connecting hole 208 for connecting the two sides of the second portion 207, so that the second internal flow channel 104 of the motor housing 100 and the internal flow channel 301 of the reducer housing 300 can be connected through the connecting hole 208 of the second portion 207, so that the second internal flow channel 104... The oil can be fed into the internal flow channel 301 of the reducer housing 300, thereby enabling the internal flow channel 301 of the reducer housing 300 to deliver oil to the internal flow channel 205 of the partition plate 200. The oil is then delivered to the second oil outlet 203 through the internal flow channel 205 of the partition plate 200, so that the oil received by the heat exchanger 15 in the second internal flow channel 104 can be delivered to the internal flow channel 205 of the partition plate 200 through the internal flow channel 301 of the reducer housing 300.

[0108] In this embodiment, the connecting hole 208 located in the second part 207 only needs to enable the connection between the second internal flow channel 104 and the internal flow channel 301 of the reducer housing 300. This allows the axial dimension of the second part 207 of the partition plate 200 to be smaller, thereby reducing the axial dimension occupied by the partition plate 200 in the housing 10a. This facilitates the delivery of oil to the internal flow channel 301 of the reducer housing 300 and the internal flow channel 205 of the partition plate 200 to cool the rotor 1102, even with a smaller axial dimension of the partition plate 200.

[0109] In one embodiment, such as Figure 12As shown, the outlet 104a of the second internal flow channel 104 is located on the mounting surface 107 of the motor housing 100. The outlet 104a of the second internal flow channel 104 is used to output the oil received from the heat exchanger 15. The inlet 301a of the internal flow channel 301 of the reducer housing 300 is located on the mounting surface 304 of the reducer housing 300. The inlet 301a of the internal flow channel 301 of the reducer housing 300 is used to receive the oil output from the outlet 104a of the second internal flow channel 104. Figure 5 and Figure 12 As shown, the extension direction of the second internal flow channel 104 is parallel to the axial direction O of the drive motor 11, and the distance between the internal flow channel 301 of the reducer housing 300 and the axis N of the drive motor 11 gradually decreases in the direction away from the drive motor 11.

[0110] In this embodiment, the outlet 104a of the second internal flow channel 104 is distributed on the mounting surface 107 of the motor housing 100, so that the oil in the second internal flow channel 104 of the motor housing 100 can be output from the motor housing 100 through the outlet 104a of the second internal flow channel 104. This eliminates the need for the outlet 104a of the second internal flow channel 104 to be arranged on the outer periphery of the motor housing 100, which helps to save the external connecting pipe that communicates with the internal flow channel 301 of the reducer housing 300. The inlet 301a of the internal flow channel 301 of the reducer housing 300 is distributed on the mounting surface 304 of the reducer housing 300. The inlet 301a of the internal flow channel 301 of the reducer housing 300 is used to receive the oil output from the outlet 104a of the second internal flow channel 104, so that the inlet 301a of the internal flow channel 301 of the reducer housing 300 does not need to be arranged on the outer periphery of the reducer housing 300, which is beneficial to save the external connecting pipe connected to the outlet 104a of the second internal flow channel 104 of the motor housing 100.

[0111] In this embodiment, the outlet 104a of the second internal flow channel 104 is distributed on the mounting surface 107 of the motor housing 100, and the inlet 301a of the internal flow channel 301 of the reducer housing 300 is distributed on the mounting surface 304 of the reducer housing 300. This allows the connection between the second internal flow channel 104 and the internal flow channel 301 of the reducer housing 300 to be directly achieved through the oil passage of the housing 10a of the powertrain 10, without the need for additional external pipes, which helps to save space.

[0112] In this embodiment, the extension direction of the second internal flow channel 104 is parallel to the axial direction O of the drive motor 11, making the length of the second internal flow channel 104 of the motor housing 100 shorter. This allows the second internal flow channel 104 of the motor housing 100 to deliver the oil output from the heat exchanger 15 to the outlet 104a of the second internal flow channel 104 more quickly, thereby accelerating the speed at which the oil is output from the outlet 104a of the second internal flow channel 104 to the internal flow channel 301 of the reducer housing 300. This allows the internal flow channel 301 of the reducer housing 300 to deliver the oil to the second oil outlet 203 more quickly through the internal flow channel 205 of the partition plate 200, improving the efficiency of the oil output from the second oil outlet 203 for cooling the other side 1106 of the rotor 1102 of the drive motor 11.

[0113] In this embodiment, the distance between the internal flow channel 301 of the reducer housing 300 and the axis N of the drive motor 11 gradually decreases in the direction away from the drive motor 11, so that the oil entering the internal flow channel 301 of the reducer housing 300 from the inlet 301a of the internal flow channel 301 can flow under the action of gravity, which helps to reduce oil resistance and reduce oil power loss.

[0114] In one embodiment, such as Figure 5 , Figure 11 and Figure 12 As shown, the internal flow channel 301 of the reducer housing 300 includes a third internal flow channel 305 and a fourth internal flow channel 306. The distance between the third internal flow channel 305 and the axis N of the drive motor 11 is greater than the distance between the fourth internal flow channel 306 and the axis N of the drive motor 11. The inlet 305a of the third internal flow channel 305 is distributed on the mounting surface 304 of the reducer housing 300. The fourth internal flow channel 306 and the internal flow channel 205 of the partition plate 200 are used to receive oil from the third internal flow channel 305.

[0115] In the embodiments of this application, such as Figure 5 As shown, the internal flow channel 301 of the reducer housing 300 includes a third internal flow channel 305 and a fourth internal flow channel 306. The distance between the third internal flow channel 305 and the axis N of the drive motor 11 is greater than the distance between the fourth internal flow channel 306 and the axis N of the drive motor 11. This allows the internal flow channel 301 of the reducer housing 300 to be divided into two segments, the third internal flow channel 305 and the fourth internal flow channel 306, which are located at different positions. This allows the third internal flow channel 305 and the fourth internal flow channel 306 of the internal flow channel 301 of the reducer housing 300 to be formed by segmented processing or drafting. The third internal flow channel 305 and the fourth internal flow channel 306 are shorter than the entire internal flow channel 301 of the reducer housing 300, which is beneficial for simplifying the processing technology, reducing the difficulty of oil circuit manufacturing, and reducing the oil circuit manufacturing cost.

[0116] In the embodiments of this application, such as Figure 11 and Figure 12 As shown, the inlet 305a of the third internal flow channel 305 is located on the mounting surface 304 of the reducer housing 300, allowing the third internal flow channel 305 to be formed by drafting from the mounting surface 304 of the reducer housing 300. This also allows the third internal flow channel 305 to receive oil from the second internal flow channel 104 of the motor housing 100. The fourth internal flow channel 306 and the internal flow channel 205 of the partition plate 200 are used to receive oil from the third internal flow channel 305, allowing the oil entering the internal flow channel 301 of the reducer housing 300 from the third internal flow channel 305 to be diverted into the fourth internal flow channel 306 and the internal flow channel 205 of the partition plate 200, respectively. Figure 5 As shown, the oil in the internal flow channel 301 of the reducer housing 300 can be delivered to the second oil outlet 203 through the internal flow channel 205 of the partition plate 200. The oil is then output through the second oil outlet 203 to the other side 1106 of the rotor 1102 of the drive motor 11 in the motor cavity 400 to cool the rotor 1102 of the drive motor 11. The oil can also be input into the reducer cavity 500 through the fourth internal flow channel 306 to cool and lubricate the planetary reducer 12 or the differential 14. This allows the planetary reducer 12 or the differential 14 to be actively lubricated directly through the internal flow channel 301 of the reducer housing 300, which is beneficial to improving the lubrication efficiency of the planetary reducer 12 and the differential 14.

[0117] In one embodiment, such as Figure 5 , Figure 7 and Figure 9 As shown, the side 202 of the partition plate 200 facing the reducer housing 300 includes a third bearing groove 209 and a third oil outlet 210, as... Figure 11 As shown, the inner wall of the reducer housing 300 facing the partition plate 200 includes a fourth bearing groove 307 and a fourth oil outlet 308. A third oil outlet 210 is located at the bottom 209a of the third bearing groove 209, and a fourth oil outlet 308 is located at the bottom 307a of the fourth bearing groove 307. The third bearing groove 209 and the fourth bearing groove 307 are used to fix the two bearings 1204 and 1205 of the planetary carrier 1201 in the planetary reducer 12, respectively. Figure 5 and Figure 9 As shown, the third oil outlet 210 and the fourth oil outlet 308 are used to output oil lubrication for bearings 1204 and 1205 of the planetary carrier 1201 in the planetary reducer 12. Specifically, the third oil outlet 210 receives oil transmitted through the third internal flow channel 305 via the internal flow channel 205 of the partition plate 200, and the fourth oil outlet 308 receives oil transmitted through the third internal flow channel 305 via the fourth internal flow channel 306.

[0118] In the embodiments of this application, such as Figure 5 and Figure 9 As shown, the side 202 of the partition plate 200 facing the reducer housing 300 includes a third bearing groove 209 and a third oil outlet 210. The third oil outlet 210 is distributed at the bottom 209a of the third bearing groove 209. The third bearing groove 209 is used to fix the bearing 1204 of the planetary carrier 1201 in the planetary reducer 12. The third oil outlet 210 is used to receive the oil transmitted by the third internal flow channel 305 through the internal flow channel 205 of the partition plate 200, so that the third oil outlet 210 can receive the oil from the internal flow channel 205 of the partition plate 200 and output it to the bearing 1204 of the planetary carrier 1201, thereby directly lubricating the bearing 1204 of the planetary carrier 1201, which is beneficial to improving the lubrication efficiency of the planetary reducer 12, and thus improving the lubrication efficiency of the powertrain 10.

[0119] In the embodiments of this application, such as Figure 5 and Figure 11 As shown, the inner wall of the reducer housing 300 facing the partition plate 200 includes a fourth bearing groove 307 and a fourth oil outlet 308. The fourth oil outlet 308 is located at the bottom 307a of the fourth bearing groove 307. The fourth oil outlet 308 is used to receive oil transmitted from the third internal flow channel 305 through the fourth internal flow channel 306, so that the fourth oil outlet 308 can receive oil from the fourth internal flow channel 306 and output it to the bearing 1205 of the planetary carrier 1201, thereby directly lubricating the bearing 1205 of the planetary carrier 1201, which is beneficial to improving the lubrication efficiency of the planetary reducer 12, and thus improving the lubrication efficiency of the powertrain 10.

[0120] In one embodiment, such as Figure 5 and Figure 11 As shown, the distance between the position where the internal flow channel 205 of the partition 200 connects with the third internal flow channel 305 and the axis N of the drive motor 11 is greater than the distance between the position where the fourth internal flow channel 306 connects with the third internal flow channel 305 and the axis N of the drive motor 11.

[0121] In the embodiments of this application, such as Figure 5 and Figure 11As shown, the distance between the position where the internal flow channel 205 of the partition plate 200 connects with the third internal flow channel 305 and the axis N of the drive motor 11 is greater than the distance between the position where the fourth internal flow channel 306 connects with the third internal flow channel 305 and the axis N of the drive motor 11. The larger distance between the position where the internal flow channel 205 of the partition plate 200 connects with the third internal flow channel 305 and the axis N of the drive motor 11 allows the position where the internal flow channel 205 of the partition plate 200 connects with the third internal flow channel 305 to be closer to the mounting surface 304 of the reducer housing 300. This facilitates the faster input of oil entering the third internal flow channel 305 into the internal flow channel 205 of the partition plate 200. As a result, the oil in the internal flow channel 205 of the partition plate 200 can be output more quickly from the second oil outlet 203 to the other side 1106 of the rotor 1102 of the drive motor 11 to cool down the rotor 1102 of the drive motor 11, thereby improving the cooling efficiency of the powertrain 10. The distance between the position where the fourth internal flow channel 306 connects to the third internal flow channel 305 and the axis N of the drive motor 11 is small, which allows the oil in the third internal flow channel 305 to be transported to the fourth internal flow channel 306 by gravity, which helps to reduce oil resistance and reduce oil power loss.

[0122] In one embodiment, such as Figure 5 , Figure 11 and Figure 12 As shown, the inner wall of the reducer housing 300 includes a mounting groove 309, a fifth oil outlet 310, and a sixth oil outlet 311. The mounting groove 309 is used to mount the gear ring 1202 of the planetary reducer 12. The fifth oil outlet 310 and the sixth oil outlet 311 are arranged on both sides of the mounting groove 309 along the axial direction O of the drive motor 11. The fifth oil outlet 310 is located on the side of the mounting groove 309 facing the drive motor 11 and is directly connected to the third internal flow channel 305 to receive oil. The inlet 205a of the internal flow channel 205 of the partition plate 200 is used to receive the oil output from the fifth oil outlet 310. The sixth oil outlet 311 is located on the side of the mounting groove 309 away from the drive motor 11 and is directly connected to the fourth internal flow channel 306 to receive oil. The oil output from the sixth oil outlet 311 is used to lubricate at least one of the planetary reducer 12 or the differential 14. The distance between the fifth oil outlet 310 and the motor shaft 1103 along the radial direction R of the drive motor 11 is greater than the distance between the sixth oil outlet 311 and the motor shaft 1103.

[0123] In this embodiment, the fifth oil outlet 310 is located on the side of the mounting groove 309 facing the drive motor 11. The fifth oil outlet 310 is used to directly connect to the third internal flow channel 305 to receive oil. The inlet 205a of the internal flow channel 205 of the partition plate 200 is used to receive the oil output from the fifth oil outlet 310, making the fifth oil outlet 310 closer to the slot 302 of the reducer housing 300. This allows the oil input into the third internal flow channel 305 to be transported to the fifth oil outlet 310 more quickly via a shorter path, thus enabling the partition plate to... The inlet 205a of the internal flow channel 205 of the partition plate 200 can receive the oil output from the fifth oil outlet 310 more quickly, which helps the internal flow channel 205 of the partition plate 200 to transport the oil to the second oil outlet 203 more quickly. The oil is then output from the second oil outlet 203 to the other side 1106 of the rotor 1102 of the drive motor 11 more quickly to cool down the rotor 1102 of the drive motor 11, thereby improving the cooling efficiency of the rotor 1102 of the drive motor 11 and thus improving the cooling efficiency of the powertrain 10.

[0124] In this embodiment, the sixth oil outlet 311 is distributed on the side of the mounting groove 309 away from the drive motor 11. The sixth oil outlet 311 is used to directly connect to the fourth internal flow channel 306 to receive oil. The oil output from the sixth oil outlet 311 is used to lubricate at least one of the planetary reducer 12 or the differential 14, so that oil can be directly delivered to lubricate the planetary reducer 12 and the differential 14 through the fourth internal flow channel 306 and the sixth oil outlet 311 of the reducer housing 300, thereby achieving active lubrication of the planetary reducer 12 and the differential 14, which is beneficial to improving the lubrication efficiency of the planetary reducer 12 and the differential 14, and thus improving the cooling and lubrication efficiency of the powertrain 10.

[0125] In this embodiment, the distance between the fifth oil outlet 310 along the radial direction R of the drive motor 11 and the axis N of the drive motor 11 is greater than the distance between the sixth oil outlet 311 and the axis N of the drive motor 11. The larger distance between the fifth oil outlet 310 and the axis N of the drive motor 11 allows the fifth oil outlet 310 to connect to the third internal flow channel 305, which is farther away along the radial direction R of the drive motor 11 and the axis N of the drive motor 11. The smaller distance between the sixth oil outlet 311 and the axis N of the drive motor 11 facilitates the connection of the sixth oil outlet 311 to the fourth internal flow channel 306, which is closer along the radial direction R of the drive motor 11 and the axis N of the drive motor 11.

[0126] In one embodiment, such as Figure 3 and Figure 7As shown, the motor housing 100 includes a filter tank 108, an oil pump tank 109, and a heat exchanger oil outlet 110. The filter tank 108 is used to install the oil filter 17 of the powertrain 10, the oil pump tank 109 is used to install the oil pump 16 of the powertrain 10, the oil filter 17 is used to filter the oil output by the oil pump 16 of the powertrain 10, and the heat exchanger oil outlet 110 is used to supply the oil output by the oil filter 17 to the heat exchanger 15. The slot opening 108a of the filter tank 108 faces the partition plate 200. 0 is used to enclose the slot 108a of the filter tank 108. The connecting pipe 111 between the filter tank 108 and the oil outlet 110 of the heat exchanger is distributed along the axial direction O of the drive motor 11. The extension direction of the connecting pipe 112 between the oil pump tank 109 and the filter tank 108 is perpendicular to the extension direction of the connecting pipe 111 between the filter tank 108 and the oil outlet 110 of the heat exchanger. The extension direction of the oil outlet 110 of the heat exchanger is perpendicular to the extension direction of the connecting pipe 111 between the filter tank 108 and the oil outlet 110 of the heat exchanger.

[0127] In this embodiment, the filter tank 108 is used to install the oil filter 17 of the powertrain 10. The opening 108a of the filter tank 108 faces the partition plate 200. The partition plate 200 is used to enclose the opening 108a of the filter tank 108, so that the partition plate 200 can be directly used as the cover plate of the filter tank 108. This is beneficial to simplify the structure of the housing 10a of the powertrain 10, and also to save materials and reduce weight.

[0128] In the embodiments of this application, such as Figure 7 As shown, the connecting pipe 111 between the filter tank 108 and the oil outlet 110 of the heat exchanger is distributed along the axial direction O of the drive motor 11. The extending direction of the connecting pipe 112 between the oil pump tank 109 and the filter tank 108 is perpendicular to the extending direction of the connecting pipe 111 between the filter tank 108 and the oil outlet 110 of the heat exchanger. This shortens the oil path from the oil pump tank 109 and the filter tank 108 into the oil outlet 110 of the heat exchanger, thus shortening the path for the oil to enter the heat exchanger 15. Figure 5 and Figure 6 As shown, the heat exchanger 15 can output oil to the first internal flow channel 103 and the second internal flow channel 104 of the motor housing 100 more quickly, thereby delivering oil to the first oil outlet 101 and the second oil outlet 203 more quickly. The first oil outlet 101 and the second oil outlet 203 respectively deliver oil to cool one side 1105 and the other side 1106 of the rotor 1102 of the drive motor 11, which is beneficial to improving the cooling efficiency of the rotor 1102 of the drive motor 11.

[0129] In this embodiment, the connecting pipe 111 between the filter tank 108 and the oil outlet 110 of the heat exchanger is distributed along the axial direction O of the drive motor 11. The extension direction of the oil outlet 110 of the heat exchanger is perpendicular to the extension direction of the connecting pipe 111 between the filter tank 108 and the oil outlet 110 of the heat exchanger, so that the oil outlet 110 of the heat exchanger can protrude from the motor housing 100 away from the motor cavity 400, thereby facilitating the fixed connection of the oil outlet 110 of the heat exchanger to the heat exchanger 15 distributed on the outer peripheral wall of the motor housing 100.

[0130] In one embodiment, such as Figure 5 and Figure 8 As shown, the motor housing 100 includes a fifth bearing groove 113 and a seventh oil outlet 114. The fifth bearing groove 113 is located on the outer wall of the motor housing 100 away from the partition plate 200. The fifth bearing groove 113 is used to fix the outer ring of the bearing 1208 of the drive shaft 1203. The inner ring of the bearing 1208 of the drive shaft 1203 is used to fix one end 1206 of the drive shaft 1203. The other end 1207 of the drive shaft 1203 passes through the shaft cavity 1104 of the motor shaft 1103 and extends into the reducer cavity 500 to drive and connect the differential 14. The seventh oil outlet 114 is located at the bottom 113a of the fifth bearing groove 113. The seventh oil outlet 114 is used to directly connect to the first internal flow channel 103, such as... Figure 6 and Figure 10 As shown, the seventh oil outlet 114 is used to output oil to lubricate the bearing 1208 of the fixed transmission shaft 1203, and the extension direction of the seventh oil outlet 114 is perpendicular to the first internal flow channel 103.

[0131] In this embodiment, the inner ring of the bearing 1208 of the drive shaft 1203 is used to fix one end 1206 of the drive shaft 1203, and the other end 1207 of the drive shaft 1203 passes through the shaft cavity 1104 of the motor shaft 1103 and extends into the reducer cavity 500 to drive and connect the differential 14, so that the power received by the planetary reducer 12 by the differential 14 can be transmitted to the wheels 40 on both sides of the electric vehicle 1 through the drive shaft 1203.

[0132] In this embodiment, the seventh oil outlet 114 is located at the bottom 113a of the fifth bearing groove 113. The seventh oil outlet 114 is used to directly connect to the first internal flow channel 103 and to output oil to lubricate the bearing 1208 of the fixed drive shaft 1203. This allows the bearing 1208 of the drive shaft 1203 to be directly lubricated through the oil passage of the housing 10a of the powertrain 10, which is beneficial to improving the lubrication efficiency of the bearing 1208 of the drive shaft 1203. It also allows the oil in the first internal flow channel 103 to not only be delivered to the first oil outlet 101 for cooling the rotor 1102 of the drive motor 11, but also to be output through the seventh oil outlet 114 to lubricate the bearing 1208 of the drive shaft 1203. The first oil outlet 101 and the seventh oil outlet 114 share the same first internal flow channel 103, which simplifies the oil passage of the housing 10a of the powertrain 10.

[0133] In this embodiment, the extension direction of the seventh oil outlet 114 is perpendicular to the first internal flow channel 103. The seventh oil outlet 114 is distributed at the bottom 113a of the fifth bearing groove 113. The fifth bearing groove 113 is used to fix the outer ring of the bearing 1208 of the drive shaft 1203, which makes it easier for the seventh oil outlet 114 to lubricate the bearing 1208 of the drive shaft 1203.

[0134] Figure 13 yes Figure 4 A cross-sectional view of the powertrain 10 along BB.

[0135] In one embodiment, such as Figure 4 and Figure 13 As shown, the powertrain 10 includes a motor cavity 400, a reducer cavity 500, and a dry oil reservoir 600. The motor cavity 400 is used to house the stator 1101 and rotor 1102 of the drive motor 11. The reducer cavity 500 is used to house the planetary reducer 12. The drive motor 11 is used to drive the wheels 40 of the electric vehicle 1 through the planetary reducer 12. The dry oil reservoir 600 is used to store the oil flowing out of the motor cavity 400 and the reducer cavity 500 under the action of gravity. The dry oil reservoir 600 is used to supply oil to the oil pump 16 of the powertrain 10. The dry oil storage chamber 600 includes a motor oil storage chamber 601 and a reducer oil storage chamber 602. The motor chamber 400 and the reducer chamber 500 are adjacent to each other along the axial direction O of the drive motor 11. The motor oil storage chamber 601 and the motor chamber 400 are adjacent to each other along the radial direction R of the drive motor 11. The reducer oil storage chamber 602 and the reducer chamber 500 are adjacent to each other along the radial direction R of the drive motor 11. The motor oil storage chamber 601 and the motor chamber 400 are directly connected along the radial direction R of the drive motor 11. The reducer oil storage chamber 602 and the reducer chamber 500 are directly connected along the radial direction R of the drive motor 11. The motor oil storage chamber 601 and the reducer oil storage chamber 602 are connected along the axial direction O of the drive motor 11.

[0136] In this embodiment, the motor oil reservoir 601 and the motor cavity 400 are distributed adjacently along the radial direction R of the drive motor 11, ensuring that the rotor 1102 and stator 1101 of the drive motor 11 within the motor cavity 400 are not submerged in the oil within the motor oil reservoir 601. This prevents the rotor 1102 from agitating the oil within the motor oil reservoir 601 during rotation, thus preventing losses and improving the efficiency of the powertrain 10. It also prevents the stator 1101 windings from being immersed in oil for extended periods, thus reducing the risk of insulation aging and breakdown and improving the reliability of the powertrain 10.

[0137] In this embodiment, the motor oil storage chamber 601 is directly connected to the motor cavity 400 along the radial direction R of the drive motor 11, so that the motor oil storage chamber 601 can directly receive the oil flowing out of the motor cavity 400 under the action of gravity, which facilitates the rapid flow of oil from the motor cavity 400 into the motor oil storage chamber 601 and accelerates the oil circulation in the powertrain 10.

[0138] In this embodiment, the reducer oil reservoir 602 and the reducer cavity 500 are distributed adjacently along the radial direction R of the drive motor 11, such that the planetary reducer 12 in the reducer cavity 500 and the reducer oil reservoir 602 are arranged at intervals along the radial direction R of the drive motor 11. This prevents the gears of the planetary reducer 12 from being submerged in the oil in the reducer oil reservoir 602, and prevents the gears of the planetary reducer 12 from stirring the oil in the reducer oil reservoir 602 during operation. This achieves zero oil stirring of the gears of the planetary reducer 12, thereby effectively reducing the oil stirring loss of the powertrain 10 and improving the efficiency of the powertrain 10.

[0139] In this embodiment, the reducer oil storage chamber 602 and the reducer chamber 500 are directly connected along the radial direction R of the drive motor 11, so that the oil collected in the reducer chamber 500 can flow directly into the reducer oil storage chamber 602 by gravity, thereby avoiding the accumulation of oil in the reducer chamber 500 and preventing the planetary reducer 12 in the reducer chamber 500 from churning during operation. This is beneficial to achieve a zero-churning state for the gears of the planetary reducer 12, avoid turbulence losses caused during gear rotation, and improve the efficiency of the powertrain 10.

[0140] In this embodiment, the motor cavity 400 and the reducer cavity 500 are distributed adjacently along the axial direction O of the drive motor 11. This allows the stator 1101 and rotor 1102 of the drive motor 11 within the motor cavity 400 and the planetary reducer 12 within the reducer cavity 500 to be arranged in relatively independent spaces. This is beneficial for protecting the drive motor 11 and the planetary reducer 12 and improving the reliability of the powertrain 10. The isolation between the motor cavity 400 and the reducer cavity 500 also facilitates meeting the differentiated cooling and lubrication requirements within the motor cavity 400 and the reducer cavity 500, thus optimizing the performance of the powertrain 10.

[0141] In this embodiment, the motor oil reservoir 601 and the reducer oil reservoir 602 are connected along the axial direction O of the drive motor 11. This facilitates the formation of a dry oil reservoir 600 in the powertrain 10 by the motor oil reservoir 601 and the reducer oil reservoir 602 together. This simplifies the structure of the housing 10a of the powertrain 10 that forms the dry oil reservoir 600, thus reducing costs. The connection between the motor oil reservoir 601 and the reducer oil reservoir 602 along the axial direction O of the drive motor 11 also allows oil in the reducer oil reservoir 602 to flow into the motor oil reservoir 601. This facilitates the oil pump 16 of the powertrain 10 to pump oil from the dry oil reservoir 600 into the powertrain 10 for cooling and lubrication of the drive motor 11 and the planetary reducer 12, thus facilitating oil circulation.

[0142] In this embodiment, the motor oil storage chamber 601 and the motor chamber 400 are arranged at intervals along the radial direction R of the drive motor 11, and the motor oil storage chamber 601 and the motor chamber 400 are directly connected along the radial direction R of the drive motor 11. The reducer oil storage chamber 602 and the reducer chamber 500 are arranged at intervals along the radial direction R of the drive motor 11, and the reducer oil storage chamber 602 and the reducer chamber 500 are directly connected along the radial direction R of the drive motor 11. This allows the oil input into the motor chamber 400 and the reducer chamber 500 to flow into the motor oil storage chamber 601 and the reducer oil storage chamber 602 respectively for storage, thereby preventing the oil from accumulating in the motor chamber 400 and the reducer chamber 500. This prevents the oil from submerging the air gap between the rotor 1102 and the stator 1101 of the drive motor 11, and prevents the gear set of the planetary reducer 12 from churning oil during rotation, thereby effectively reducing the oil churning loss of the powertrain 10 and improving the efficiency of the powertrain 10. Connecting the reducer oil reservoir 602 and the motor oil reservoir 601 along the axial direction O of the drive motor 11 simplifies the structure of the dry oil reservoir 600 forming the powertrain 10 and helps reduce costs.

[0143] It should be noted that the dry oil reservoir 600 refers to the oil reservoir of the powertrain 10 being independent of the motor reservoir 400 and the reducer reservoir 500. Only oil splashing and collection occur in the motor reservoir 400 and reducer reservoir 500; no oil is stored at the bottom of these reservoirs. The oil collected in the motor reservoir 400 and reducer reservoir 500 is stored in the dry oil reservoir 600. Using the dry oil reservoir 600, oil can be delivered to the target location on demand, quantitatively, and directionally through an external or precisely controlled system.

[0144] In contrast to the dry oil reservoir 600, there is a wet oil reservoir. A wet oil reservoir means that the storage, splashing and collection of oil are all completed in the same sealed shell. When the vehicle is stationary, the oil accumulates at the bottom. When the vehicle is running, the gears immerse or agitate the oil, bringing up oil mist or oil droplets, which can easily cause oil churning loss and reduce the efficiency of the powertrain.

[0145] Figure 14 This is a cross-sectional view of the housing 10a of the powertrain 10 provided in this application embodiment.

[0146] In one embodiment, such as Figure 13 and Figure 14 As shown, the motor cavity 400 includes a first motor cavity 401 and a second motor cavity 402. The first motor cavity 401 and the second motor cavity 402 are distributed on both sides of the stator 1101 of the drive motor 11 along the axial direction O of the drive motor 11. The first motor cavity 401 and the second motor cavity 402 are directly connected to the motor oil storage cavity 601 along the radial direction R of the drive motor 11.

[0147] In this embodiment, the first motor cavity 401 and the second motor cavity 402 are distributed along the axial direction O of the drive motor 11 on both sides of the stator 1101 of the drive motor 11. The first motor cavity 401 and the second motor cavity 402 are directly connected to the motor oil storage cavity 601 along the radial direction R of the drive motor 11, so that the oil on both sides of the stator 1101 of the drive motor 11 can be directly input into the motor oil storage cavity 601, preventing the oil in the motor cavity 400 from accumulating on both sides of the stator 1101 of the drive motor 11 and submerging the air gap between the rotor 1102 and the stator 1101, thereby improving the efficiency of the powertrain 10. It also allows the oil entering the first motor cavity 401 and the oil entering the second motor cavity 402 to flow out into the motor oil storage cavity 601 respectively, which helps to increase the rate at which the oil in the motor cavity 400 flows into the motor oil storage cavity 601, improves the oil return efficiency of the powertrain 10, and helps to accelerate the oil circulation in the powertrain 10, thereby helping to improve the cooling efficiency of the powertrain.

[0148] In one embodiment, such as Figure 6 and Figure 13 As shown, the oil output from the first oil outlet 101 of the motor housing 100 enters the first section of the motor cavity 401 to cool one side 1105 of the rotor 1102 of the drive motor 11. Figure 5 and Figure 13 As shown, the oil output from the second oil outlet 203 of the partition 200 enters the second motor cavity 402 to cool the other side 1106 of the rotor 1102 of the drive motor 11.

[0149] In one embodiment, such as Figure 13 and Figure 14 As shown, the reducer cavity 500 includes a first reducer cavity 501 and a second reducer cavity 502. The first reducer cavity 501 is used to accommodate the first planetary gear set 12a of the planetary reducer 12, and the second reducer cavity 502 is used to accommodate the second planetary gear set 12b of the planetary reducer 12. The first planetary gear set 12a is used to drive the drive motor 11 and the second planetary gear set 12b. The first reducer cavity 501 is directly connected to the reducer oil reservoir 602 along the radial direction R of the drive motor 11.

[0150] In this embodiment, the first reducer cavity 501 is used to accommodate the first planetary gear set 12a of the planetary reducer 12, and the second reducer cavity 502 is used to accommodate the second planetary gear set 12b of the planetary reducer 12. The first reducer cavity 501 is directly connected to the reducer oil storage cavity 602 along the radial direction R of the drive motor 11, so that the oil input into the first reducer cavity 501 does not accumulate in the first reducer cavity 501, preventing the first planetary gear set 12a located in the first reducer cavity 501 from churning, thereby reducing the churning loss of the planetary reducer 12 and improving the efficiency of the powertrain 10.

[0151] In another embodiment, such as Figure 13 As shown, the second reducer cavity 502 is directly connected to the reducer oil reservoir 602 along the radial direction R of the drive motor 11. This prevents the oil entering the second reducer cavity 502 from accumulating inside, thus preventing the second planetary gear set 12b located in the second reducer cavity 502 from churning, thereby reducing the churning loss of the planetary reducer 12 and improving the efficiency of the powertrain 10.

[0152] In another embodiment, such as Figure 13 As shown, the first reducer cavity 501 and the second reducer cavity 502 are directly connected to the reducer oil reservoir 602 along the radial direction R of the drive motor 11, so that the oil input into the first reducer cavity 501 and the second reducer cavity 502 does not accumulate in the first reducer cavity 501 and the second reducer cavity 502, thereby preventing the first planetary gear set 12a and the second planetary gear set 12b from churning, which helps to reduce the churning loss of the powertrain 10 and improve the efficiency of the powertrain 10.

[0153] In one embodiment, such as Figure 5 and Figure 13As shown, oil output from the third oil outlet 210 of the partition plate 200 is fed into the first stage reducer cavity 501 to lubricate the bearing 1204 of the planetary carrier 1201 of the planetary reducer 12. Oil output from the fourth oil outlet 308 and the sixth oil outlet 311 of the reducer housing 300 is fed into the second stage reducer cavity 502. Oil output from the fourth oil outlet 308 is used to lubricate another bearing 1205 of the planetary carrier 1201 of the planetary reducer 12, and oil output from the sixth oil outlet 311 is used for cooling and lubrication of at least one of the planetary reducer 12 or the differential 14.

[0154] In one embodiment, such as Figure 13 and Figure 14 As shown, along the axial direction O of the drive motor 11, the first section of the reducer cavity 501 is arranged between the motor cavity 400 and the second section of the reducer cavity 502, and the reducer oil reservoir 602 is directly connected to the first section of the reducer cavity 501 along the radial direction R of the drive motor 11.

[0155] In this embodiment, the first reducer cavity 501 is used to accommodate the first planetary gear set 12a of the planetary reducer 12, the second reducer cavity 502 is used to accommodate the second planetary gear set 12b of the planetary reducer 12, and the motor cavity 400 is used to accommodate the stator 1101 and rotor 1102 of the drive motor 11. The first reducer cavity 501 is arranged between the motor cavity 400 and the second reducer cavity 502 along the axial direction of the drive motor 11, so as to facilitate the transmission connection between the first planetary gear set 12a located in the first reducer cavity 501 and the drive motor 11 and the second planetary gear set 12b.

[0156] In this embodiment, the reducer oil reservoir 602 is directly connected to the first reducer cavity 501 along the radial direction R of the drive motor 11, so that the oil input into the first reducer cavity 501 does not accumulate in the first reducer cavity 501, thereby preventing the first planetary gear set 12a located in the first reducer cavity 501 from churning, thereby reducing the churning loss of the planetary reducer 12 and improving the efficiency of the powertrain 10.

[0157] In one embodiment, such as Figure 13 and Figure 14 As shown, the length of the reducer oil reservoir 602 along the axial direction O of the drive motor 11 is less than or equal to the length of the reducer cavity 500. One end 602a of the reducer oil reservoir 602 is flush with one end 503 of the reducer cavity 500. One end 602a of the reducer oil reservoir 602 is used to connect to the motor oil reservoir 601 along the axial direction O of the drive motor 11. The other end 602b of the reducer oil reservoir 602 is used to directly connect to the first section of the reducer cavity 501 along the radial direction R of the drive motor 11.

[0158] In the embodiments of this application, such as Figure 14As shown, the length of the reducer oil reservoir 602 along the axial direction O of the drive motor 11 is denoted as L1, and the length of the reducer cavity 500 is denoted as L2, where L1 ≤ L2. One end 602a of the reducer oil reservoir 602 is flush with one end 503 of the reducer cavity 500. The smaller L1 ensures that the reducer oil reservoir 602 does not additionally occupy the dimension of the reducer cavity 500 along the axial direction O of the drive motor 11, which is beneficial for keeping the axial dimension of the powertrain 10 smaller. The larger L2 allows the reducer cavity 500 to have sufficient axial space to arrange the first planetary gear set 12a and the second planetary gear set 12b of the planetary reducer 12.

[0159] In this embodiment, one end 602a of the reducer oil reservoir 602 is used to connect to the motor oil reservoir 601 along the axial direction O of the drive motor 11, and the other end 602b of the reducer oil reservoir 602 is used to directly connect to the first section reducer cavity 501 along the radial direction R of the drive motor 11. This allows the oil collected in the first section reducer cavity 501 to flow into the other end 602b of the reducer oil reservoir 602 along the radial direction R of the drive motor 11 under the action of gravity. The oil then flows from the other end 602b of the reducer oil reservoir 602 into the first end 602a of the reducer oil reservoir 602 and the motor oil reservoir 601 along the axial direction O of the drive motor 11. This prevents the oil from accumulating in the first section reducer cavity 501, thus preventing the first planetary gear set 12a located in the first section reducer cavity 501 from churning, effectively reducing the churning loss of the powertrain 10, and improving the efficiency of the powertrain 10.

[0160] In one embodiment, such as Figure 14 As shown, the length of the reducer oil reservoir 602 along the axial direction of the drive motor 11 is less than or equal to the length of the first reducer cavity 501.

[0161] In this embodiment, the length of the reducer oil reservoir 602 along the axial direction of the drive motor 11 is relatively small, so that the oil received by the first section of the reducer cavity 501 can flow more quickly from the other end 602b of the reducer oil reservoir 602 to one end 602a of the reducer oil reservoir 602, and then quickly flow into the motor oil reservoir 601. This is beneficial to improving the oil return efficiency of the powertrain 10 and accelerating the oil circulation in the powertrain 10.

[0162] In one embodiment, such as Figure 14 As shown, the first reducer cavity 501 and the second reducer cavity 502 are directly connected along the axial direction O of the drive motor 11. The inner diameter of the first reducer cavity 501 is larger than the inner diameter of the second reducer cavity 502. The reducer oil storage cavity 602 is used to receive the oil flowing into the first reducer cavity 501 from the second reducer cavity 502 under the action of gravity through the first reducer cavity 501.

[0163] In the embodiments of this application, such as Figure 14As shown, the inner diameter of the first reducer cavity 501 is denoted as L3, and the inner diameter of the second reducer cavity 502 is denoted as L4, where L3 > L4. The first reducer cavity 501 and the second reducer cavity 502 are directly connected along the axial direction O of the drive motor 11. The larger L3 ensures that the cavity wall 501a of the first reducer cavity 501 is farther from the axis of the drive motor 11 than the cavity wall 502a of the second reducer cavity 502. This facilitates the flow of oil from the second reducer cavity 502 into the first reducer cavity 501 under gravity, and then into the reducer oil storage chamber 602 through the first reducer cavity 501, preventing oil accumulation in the second reducer cavity 502. Figure 13 As shown, this prevents the second planetary gear set 12b located in the second stage reducer cavity 502 from churning the oil, effectively reducing the oil churning loss of the powertrain 10 and improving the efficiency of the powertrain 10.

[0164] Figure 15 This is a schematic diagram of the cavity wall of the reducer cavity 500 provided in the embodiment of this application.

[0165] In one embodiment, such as Figure 14 and Figure 15 As shown, the cavity wall 502a of the second reducer cavity 502 also includes a plurality of oil guide grooves 504. The plurality of oil guide grooves 504 are distributed at intervals along the circumferential direction C of the drive motor 11. One end 504a of each oil guide groove 504 facing the first reducer cavity 501 is used to directly connect to the first reducer cavity 501 along the axial direction O of the drive motor 11.

[0166] In this embodiment, the cavity wall 502a of the second reducer cavity 502 further includes multiple oil guide grooves 504. These grooves are spaced apart along the circumferential direction C of the drive motor 11. One end 504a of each oil guide groove 504 facing the first reducer cavity 501 is directly connected to the first reducer cavity 501 along the axial direction O of the drive motor 11. This facilitates the collection of oil entering the second reducer cavity 502 by the multiple oil guide grooves 504 when it hits the cavity wall 502a, and the oil is then guided back to the first reducer cavity 501 through one end 504a of each groove. Figure 13 As shown, this helps to accelerate the flow of oil from the second stage reducer cavity 502 into the first stage reducer cavity 501, helps to prevent oil from accumulating in the second stage reducer cavity 502, can prevent the second planetary gear set 12b located in the second stage reducer cavity 502 from churning, effectively reduces the churning loss of the powertrain 10, and improves the efficiency of the powertrain 10.

[0167] In one embodiment, such as Figures 13 to 15As shown, the cavity wall 502a of the second reducer cavity 502 includes a mounting groove 505 for fixing the gear ring 1202 of the second planetary gear set 12b. The mounting groove 505 includes a plurality of grooves 506, each groove 506 for accommodating the embedding of the gear ring 1202 in the second planetary gear set 12b. The plurality of grooves 506 are distributed at intervals along the circumferential direction C of the drive motor 11. Among the adjacent plurality of grooves 506, at least one groove 506a has a greater depth along the radial direction R of the drive motor 11 than the other grooves 506 have a greater depth along the radial direction R of the drive motor 11.

[0168] In this embodiment, at least one groove 506a among adjacent grooves 506 has a greater depth along the radial direction R of the drive motor 11 than the other grooves 506 along the radial direction R of the drive motor 11, such as... Figure 15 As shown, at least one groove 506a among the adjacent grooves 506 has a greater depth along the radial direction R of the drive motor 11. This allows at least one groove 506a among the grooves 506 used to install the ring gear 1202 in the second planetary gear set 12b to also collect the oil in the second reducer cavity 502. This prevents the oil in the second reducer cavity 502 from accumulating at the meshing point between the mounting groove 505 and the ring gear 1202, thereby preventing oil churning when the planetary gears of the second planetary gear set 12b mesh with the ring gear 1202. This helps reduce the oil churning loss of the planetary reducer 12, which in turn helps reduce the oil churning loss of the powertrain 10 and improves the efficiency of the powertrain 10.

[0169] In one embodiment, such as Figure 15 As shown, the oil guide groove 504 and the mounting groove 505 are distributed adjacent to each other along the axial direction O of the drive motor 11.

[0170] In the embodiments of this application, such as Figures 13 to 15 As shown, the mounting groove 505 is used to fix the gear ring 1202 of the second planetary gear set 12b. The oil guide groove 504 and the mounting groove 505 are arranged adjacent to each other along the axial direction O of the drive motor 11, so that the oil guide groove 504 can collect the oil during the meshing and rotation between the planetary gears and the gear ring 1202 of the second planetary gear set 12b. This allows the oil used to lubricate the gears of the second planetary gear set 12b to be collected and guided into the first stage reducer cavity 501 more quickly through the oil guide groove 504, and then guided into the reducer oil storage cavity 602 through the first stage reducer cavity 501. This avoids the oil from accumulating in the second stage reducer cavity 502, reduces the oil churning loss of the second planetary gear set 12b, reduces the oil churning loss of the powertrain 10, and improves the efficiency of the powertrain 10.

[0171] Figure 16 This is a cross-sectional view of the cavity wall of the reducer cavity 500 provided in an embodiment of this application.

[0172] In one embodiment, such as Figure 13 and Figure 14 As shown, the reducer cavity 500 also includes a third reducer cavity 507. The third reducer cavity 507 and the first reducer cavity 501 are distributed on both sides of the second reducer cavity 502. The inner diameter of the second reducer cavity 502 is larger than the inner diameter of the third reducer cavity 507. Figure 15 and Figure 16 As shown, the cavity wall 507a of the third section reducer cavity 507 includes an oil collection groove 508. The distance between one end 508a of the oil collection groove 508 and the axis N of the drive motor 11 is smaller than the distance between the other end 508b of the oil collection groove 508 and the axis N of the drive motor 11. Under the action of gravity, the oil in the oil collection groove 508 flows from one end 508a to the other end 508b of the oil collection groove 508.

[0173] In the embodiments of this application, such as Figure 14 As shown, the inner diameter of the second reducer cavity 502 is L4, and the inner diameter of the third reducer cavity 507 is L5. L4 > L5, and L4 is larger, which makes the cavity wall 502a of the second reducer cavity 502 farther from the axis N of the drive motor 11 than the cavity wall 507a of the third reducer cavity 507. This facilitates the flow of oil in the third reducer cavity 507 into the second reducer cavity 502 under gravity, and then into the reducer oil storage cavity 602 through the first reducer cavity 501, preventing oil from accumulating in the third reducer cavity 507. Figure 13 As shown, this prevents oil from accumulating and flowing into the first reducer chamber 501 and the second reducer chamber 502, which would cause the first planetary gear set 12a and the second planetary gear set 12b to churn the oil, thereby reducing the oil churning loss of the planetary reducer 12 and improving the efficiency of the powertrain 10.

[0174] In the embodiments of this application, such as Figure 16 As shown, the cavity wall 507a of the third-stage reducer cavity 507 includes an oil collection groove 508, which allows the oil in the third-stage reducer cavity 507 to be collected through the oil collection groove 508. The distance between one end 508a of the oil collection groove 508 and the axis N of the drive motor 11 is denoted as L6, and the distance between the other end 508b of the oil collection groove 508 and the axis N of the drive motor 11 is denoted as L7. Since L6 < L7, the smaller L6 allows the oil collected in the third-stage reducer cavity 507 by the oil collection groove 508 to flow from one end 508a to the other end 508b under the action of gravity, and then sequentially flow into the second-stage reducer cavity 502, the first-stage reducer cavity 501, and the reducer oil storage cavity 602. This prevents the oil from accumulating in the reducer cavity 500 and prevents the first planetary gear set 12a and the second planetary gear set 12b of the planetary reducer 12 from churning, which helps to reduce the power loss of the powertrain 10.

[0175] In one embodiment, such as Figure 16 As shown, one end 5061 of one of the grooves 506, which is deeper than the others, is connected to the oil collection groove 508, and the other end 5062 is connected to the oil guide groove 504. This allows the oil collected in the third section of the reducer cavity 507 by the oil collection groove 508 to flow sequentially through one end 5061 of one groove 506a, the other end 5062 of one groove 506a, and the oil guide groove 504 into the first section of the reducer cavity 501, and then out to the reducer oil storage cavity 602. This ensures that the oil in the first section of the reducer cavity 501, the second section of the reducer cavity 502, and the third section of the reducer cavity 507 can all flow smoothly into the reducer oil storage cavity 602, preventing the oil from accumulating at the bottom of the reducer cavity 500. This reduces the churning loss of the planetary reducer 12, effectively reduces the churning loss of the powertrain 10, and improves the efficiency of the powertrain 10.

[0176] Figure 17 This is a schematic diagram of a motor housing 100 provided in an embodiment of this application.

[0177] In one embodiment, such as Figure 7 , Figure 13 and Figure 14 As shown, the housing 10a of the powertrain 10 includes a motor housing 100, a partition 200, and a reducer housing 300. The two sides 201 and 202 of the partition 200 are respectively used to fit the mounting surface 107 of the motor housing 100 and the mounting surface 304 of the reducer housing 300. Wherein, as... Figure 7 and Figure 17 As shown, the motor housing 100 includes a motor slot 115 and a motor oil return slot 116. The slot opening 115a of the motor slot 115 and the slot opening 116a of the motor oil return slot 116 face the same direction. Figure 7 and Figure 13 As shown, the slot 115a of the motor slot 115 is used to assemble the stator 1101 and rotor 1102 of the drive motor 11, and the partition plate 200 is used to enclose the slot 115a of the motor slot 115 to form a motor cavity 400. The reducer housing 300 includes a reducer slot 312 and a reducer oil return slot 313. The slot 312a of the reducer slot 312 faces the same direction as the slot 313a of the reducer oil return slot 313. The slot 312a of the reducer slot 312 is used to assemble the gear set of the planetary reducer 12, and the partition plate 200 is used to enclose the slot 312a of the reducer slot 312 to form a reducer cavity 500. The partition plate 200 also includes a connecting hole 211, which is used to connect the slot 116a of the motor oil return slot 116 and the slot 313a of the reducer oil return slot 313 along the axial direction O of the drive motor 11 to form a dry oil storage cavity 600.

[0178] In this embodiment, the two sides 201 and 202 of the partition plate 200 are respectively used to fit the mounting surface 107 of the motor housing 100 and the mounting surface 304 of the reducer housing 300, so as to facilitate the installation and disassembly of the motor housing 100, the partition plate 200 and the motor housing 100.

[0179] In this embodiment, the groove opening 115a of the motor groove 115 faces the same direction as the groove opening 116a of the motor oil return groove 116, facilitating the forming of the motor groove 115 and the motor oil return groove 116 from the same direction, thus simplifying the machining process. Similarly, the groove opening 312a of the reducer groove 312 faces the same direction as the groove opening 313a of the reducer oil return groove 313, facilitating the forming of the reducer groove 312 and the reducer oil return groove 313 from the same direction, thus simplifying the machining process.

[0180] In this embodiment, the partition plate 200 is used to enclose the slot 115a of the motor slot 115 to form the motor cavity 400, and the partition plate 200 is used to enclose the slot 312a of the reducer slot 312 to form the reducer cavity 500, so that the motor cavity 400 and the reducer cavity 500 are arranged adjacent to each other along the axial direction O of the drive motor 11, ensuring the functional independence of the motor cavity 400 and the reducer cavity 500.

[0181] In the embodiments of this application, such as Figure 7 and Figure 14 As shown, the partition plate 200 also includes a connecting hole 211, which is used to connect the slot 116a of the motor oil return groove 116 and the slot 313a of the reducer oil return groove 313 along the axial direction O of the drive motor 11 to form a dry oil storage chamber 600. This allows the dry oil storage chamber 600 to be formed by the motor oil return groove 116 in the motor housing 100, the connecting hole 211 of the partition plate 200 and the reducer oil return groove 313 in the reducer housing 300. This allows the dry oil storage chamber 600 to be formed in sections using a split structure, making the housing structure for forming the dry oil storage chamber 600 simpler and helping to reduce assembly difficulty and production costs.

[0182] In one embodiment, such as Figure 13 and Figure 17As shown, the motor housing 100 includes a first radial through hole 117 and a second radial through hole 118. The first radial through hole 117 and the second radial through hole 118 are respectively used to penetrate the common housing portion 119 of the motor slot 115 and the motor oil return slot 116 along the radial direction R of the drive motor 11. The distance between the first radial through hole 117 and the second radial through hole 118 along the axial direction O of the drive motor 11 is greater than the axial dimension of the stator 1101 of the drive motor 11 and less than the length of the motor oil return slot 116. The common housing portion 119 of the motor slot 115 and the motor oil return slot 116 includes a notch 120. The partition plate 200 is used to enclose the notch 120 to form the second radial through hole 118.

[0183] In this embodiment, the first radial through hole 117 and the second radial through hole 118 are respectively used to penetrate the common housing portion 119 of the motor slot 115 and the motor oil return slot 116 along the radial R of the drive motor 11, so that the motor slot 115 and the motor oil return slot 116 can be connected through the first radial through hole 117 and the second radial through hole 118, allowing the oil in the motor slot 115 to flow into the dry oil storage chamber 600 formed by the motor oil return slot 116 under the action of gravity through the first radial through hole 117 and the second radial through hole 118. This can prevent the oil from accumulating in the motor slot 115 and prevent the air gap between the rotor 1102 and the stator 1101 of the drive motor 11 from being immersed in the oil, which helps to reduce the oil churning loss of the drive motor 11 and improve the efficiency of the powertrain 10.

[0184] In the embodiments of this application, such as Figure 13 As shown, the distance between the first radial through hole 117 and the second radial through hole 118 along the axial direction O of the drive motor 11 is denoted as L8, and the axial dimension of the stator 1101 of the drive motor 11 is denoted as L9. L8 > L9, and L8 is larger, so that the first radial through hole 117 and the second radial through hole 118 will not be blocked by the stator 1101 of the drive motor 11, so that the oil in the motor groove 115 can flow smoothly into the motor return oil groove 116.

[0185] In the embodiments of this application, such as Figure 13 As shown, the length of the motor oil return groove 116 along the axial direction of the drive motor 11 is denoted as L10, where L8 < L10. A smaller L8 allows the oil output from the first radial through-hole 117 and the second radial through-hole 118 to be received by the motor oil return groove 116. A larger L10 ensures that the axial dimension of the motor oil return groove 116 is sufficiently large, making it easier for the motor oil return groove 116 to receive the oil output from the first radial through-hole 117 and the second radial through-hole 118.

[0186] In the embodiments of this application, such as Figure 13 and Figure 17As shown, the common housing portion 119 of the motor slot 115 and the motor oil return slot 116 includes a notch 120. The partition plate 200 is used to enclose the notch 120 to form a second radial through hole 118. The formation of the second radial through hole 118 can save material of the motor housing 100 and also allows the second radial through hole 118 to be closer to the slot opening 115a of the motor slot 115, which facilitates the flow of oil output from the second section of the motor cavity 402.

[0187] In one embodiment, such as Figure 15 and Figure 16 As shown, the reducer housing 300 includes a third radial through hole 314. The third radial through hole 314 passes through the common housing portion 315 of the reducer groove 312 and the reducer oil return groove 313 along the radial direction R of the drive motor 11. The distance between the third radial through hole 314 and the groove opening 312a of the reducer groove 312 along the axial direction O of the drive motor 11 is less than the length of the reducer oil return groove 313.

[0188] In this embodiment, the third radial through hole 314 passes through the common housing portion 315 of the reducer groove 312 and the reducer oil return groove 313 along the radial R of the drive motor 11, so that the oil in the reducer groove 312 can flow into the dry oil storage chamber 600 formed by the reducer oil return groove 313 through the third radial through hole 314 under the action of gravity. This can prevent the oil from accumulating in the reducer groove 312, reduce the oil churning loss of the planetary reducer 12, reduce the oil churning loss of the powertrain 10, and improve the efficiency of the powertrain 10.

[0189] In the embodiments of this application, such as Figure 16 As shown, the distance between the third radial through hole 314 along the axial direction O of the drive motor 11 and the slot opening 312a of the reducer groove 312 is denoted as L11, and the length of the reducer oil return groove 313 is denoted as L12. L11 < L12. L11 is smaller, so that the oil output from the third radial through hole 314 can be received by the reducer oil return groove 313. L12 is larger, so that the length of the reducer oil return groove 313 is large enough, making it easier for the reducer oil return groove 313 to receive the oil output from the third radial through hole 314.

[0190] In one embodiment, such as Figure 17As shown, the groove wall 116b of the motor oil return groove 116 includes a first groove wall 1161 and a second groove wall 1162, which are spaced apart along the circumferential direction C of the drive motor 11. The first groove wall 1161 includes a fixing structure 1163 for fixing a magnet (not shown), which is used to attract impurities in the oil. The second groove wall 1162 includes an oil suction pipe 1164 and an oil suction hole 1165. The oil suction pipe 1164 is connected to the oil pump 16 of the powertrain 10, and its extension direction is parallel to the motor oil return groove 116. The extension direction of the oil suction hole 1165 is perpendicular to the oil suction pipe 1164.

[0191] In the embodiments of this application, such as Figure 13 and Figure 17 As shown, the first section of the tank wall 1161 includes a fixing structure 1163, which is used to fix a magnet. The magnet is used to attract impurities in the oil, thereby making the oil transported from the motor return oil tank 116 to the motor cavity 400 or the reducer cavity 500 cleaner. This helps to prevent impurities in the oil from clogging the oil passages of the housing 10a. It also helps to reduce the wear and tear on the drive motor 11 and planetary reducer 12 caused by impurities in the oil when the oil is sprayed onto them, thus extending the service life of the components.

[0192] In this embodiment, the second section of the tank wall 1162 includes an oil suction pipe 1164 and an oil suction hole 1165. The oil suction pipe 1164 is used to connect to the oil pump 16 of the powertrain 10, so that the oil in the motor return oil tank 116 can be transported to the oil pump 16 through the oil suction hole 1165 and the oil suction pipe 1164, and then pumped into the housing 10a of the powertrain 10 by the oil pump 16.

[0193] In this embodiment, the oil suction pipe 1164 extends parallel to the motor oil return groove 116, so that the oil suction pipe 1164 can be arranged using the axial length space of the motor oil return groove 116 without occupying too much space in the motor housing 100.

[0194] In this embodiment, the extension direction of the oil suction hole 1165 is perpendicular to the oil suction pipe 1164, so that the oil suction hole 1165 can guide the oil into the oil suction pipe 1164 with the shortest path, which is beneficial to speed up the output of the oil from the dry oil storage chamber 600 to the housing 10a of the powertrain 10.

[0195] In one embodiment, such as Figure 13 and Figure 14As shown, the wall of at least one of the motor oil return tank 116 or the reducer oil return tank 313 includes an oil guiding structure 121. The oil guiding structure 121 is used to allow the oil stored in the motor oil return tank 116 to flow toward the opening 116a of the motor oil return tank 116 under the action of gravity, or to allow the oil stored in the reducer oil return tank 313 to flow toward the opening 313a of the reducer oil return tank 313 under the action of gravity.

[0196] In this embodiment, the wall 116b of the motor oil return tank 116 includes an oil guiding structure 121a. The oil guiding structure 121a allows the oil stored in the motor oil return tank 116 to flow towards the opening 116a of the motor oil return tank 116 under gravity. This facilitates the pumping of the oil in the motor oil return tank 116 into the oil passage of the powertrain 10 housing 10a from a position near the opening 116a of the motor oil return tank 116. It also facilitates the flow of oil in the motor oil return tank 116, preventing the oil from accumulating at the position where the motor oil tank 115 receives the output oil, thus accelerating the flow of oil in the motor oil return tank 116 and promoting the oil circulation of the powertrain 10.

[0197] In one embodiment, such as Figure 13 and Figure 14 As shown, the wall of the reducer oil return groove 313 includes an oil guiding structure 121b. The oil guiding structure 121b is used to allow the oil stored in the reducer oil return groove 313 to flow towards the groove opening 313a of the reducer oil return groove 313 under the action of gravity, so that the oil in the reducer oil return groove 313 does not accumulate at the position of receiving the oil output from the reducer groove 312, thereby accelerating the flow of oil in the reducer oil return groove 313 and thus promoting the oil circulation of the powertrain 10.

[0198] In one embodiment, such as Figure 13 and Figure 14 As shown, the walls 116b of the motor oil return groove 116 and the walls of the reducer oil return groove 313 both include an oil guiding structure 121. The oil guiding structure 121 is used to allow the oil stored in the motor oil return groove 116 to flow towards the groove opening 116a of the motor oil return groove 116 under the action of gravity. The oil guiding structure 121 is also used to allow the oil stored in the reducer oil return groove 313 to flow towards the groove opening 313a of the reducer oil return groove 313 under the action of gravity, which facilitates the flow of oil in the motor oil return groove 116 and the reducer oil return groove 313 and promotes the oil circulation of the powertrain 10.

[0199] in, Figure 14 The oil guiding structure 121 in the diagram represents only the schematic position and does not represent the specific structure.

[0200] In one embodiment, the magnet fixed by the fixing structure 1163 of the first section of the groove wall 1161 and the oil suction hole 1165 of the second section of the groove wall 1162 are arranged close to the groove opening 116a of the motor oil return groove 116, so that the oil in the motor oil return groove 116 can be cleaned by the magnet, improving the cleanliness of the oil. This helps to prevent impurities from blocking the oil suction hole 1165 when the oil is sucked in by the oil pump 16, so that the oil can be smoothly sent from the dry oil storage chamber 600 into the oil passage of the housing 10a of the powertrain 10.

[0201] In one embodiment, such as Figure 14 and Figure 17 As shown, the distance between one end of the oil guide structure 121a of the motor oil return groove 116 along the radial direction R of the drive motor 11 and the axis N of the drive motor 11 is less than the distance between the other end of the oil guide structure 121a and the axis N of the drive motor 11. Under the action of gravity, the oil in the motor oil return groove 116 flows from one end of the oil guide structure 121a to the other end of the oil guide structure 121a. The other end of the oil guide structure 121a is close to the groove opening 116a of the motor oil return groove 116. The oil suction hole 1165 is arranged along the axial direction O of the drive motor 11 on the side of the other end of the oil guide structure 121a close to the groove opening 116a of the motor oil return groove 116, so that the oil suction hole 1165 can be located at the lowest point of the oil in the motor oil return groove 116. This allows the oil suction hole 1165 to be immersed in the oil in the motor oil return groove 116 when the electric vehicle 1 tilts while climbing a slope, thereby preventing the oil pump 16 from sucking dry and ensuring the normal operation of the powertrain 10.

[0202] In one embodiment, such as Figure 14 and Figure 17 As shown, one end of the oil guide structure 121a in the motor oil return groove 116 along the radial direction R of the drive motor 11 is arranged opposite to the first radial through hole 117. The oil in the motor groove 115 flows from the first radial through hole 117 into the motor oil return groove 116 under the action of gravity and is directly transported to one end of the oil guide structure 121a. Then, under the action of gravity, it flows from one end of the oil guide structure 121a to the other end of the oil guide structure 121b. Then, through the oil suction hole 1165 near the other end of the oil guide structure 121b, the oil is transported back into the oil passage of the housing 10a of the powertrain 10. This can prevent the oil in the motor oil return groove 116 from accumulating at the position opposite to the first radial through hole 117, accelerate the flow of oil in the motor oil return groove 116, and help improve the oil circulation rate in the powertrain 10, thereby helping to improve the cooling efficiency of the powertrain 10.

[0203] In one embodiment, such as Figure 14 and Figure 16As shown, the distance between one end of the oil guide structure 121b of the reducer oil return groove 313 along the radial R of the drive motor 11 and the axis N of the drive motor 11 is less than the distance between the other end of the oil guide structure 121b and the axis N of the drive motor 11. Under the action of gravity, the oil in the reducer oil return groove 313 flows from one end of the oil guide structure 121b to the other end. The other end of the oil guide structure 121b is close to the groove opening 313a of the reducer oil return groove 313. Along the radial R of the drive motor 11, one end of the oil guide structure 121b in the reducer oil return groove 313 is arranged opposite to the third radial through hole 314. Under the action of gravity, the oil in the reducer groove 312 flows into the reducer from the third radial through hole 314. The reducer oil return groove 313 directly supplies oil to one end of the oil guiding structure 121b. Then, under the action of gravity, the oil flows from one end of the oil guiding structure 121b to the other end, thereby preventing the oil in the reducer oil return groove 313 from accumulating at the position opposite to the third radial through hole 314. This accelerates the flow rate of the oil in the reducer oil return groove 313, allowing it to flow more quickly into the motor oil return groove 116 through the connecting hole 211 of the partition plate 200. The oil is then reintroduced into the oil passage of the housing 10a of the powertrain 10 through the oil suction hole 1165 in the motor oil return groove 116. This helps to improve the oil circulation rate in the powertrain 10, thereby improving the cooling efficiency of the powertrain 10.

[0204] In one embodiment, such as Figure 3 , Figure 7 and Figure 17 As shown, the oil in the dry oil storage chamber 600 enters the oil pump 16 through the oil suction hole 1165 and the oil suction pipe 1164. The oil is then pumped into the oil filter 17 by the oil pump 16 to filter and remove impurities. The oil after impurity removal enters the heat exchanger 15 through the heat exchanger outlet 110 of the motor housing 100 for heat exchange and cooling. The oil that enters the internal flow channel of the motor housing 100 through the heat exchanger inlet 105 is split into two oil streams.

[0205] Among them, such as Figure 6 and Figure 13 As shown, one oil path is directly transported from the first internal flow channel 103 of the motor housing 100 to the first oil outlet 101. The oil is output from the first oil outlet 101 to cool one side 1105 of the rotor 1102 of the drive motor 11. Then, it enters the bottom of the first section of the motor cavity 401 and is input into the motor oil storage cavity 601 of the dry oil storage cavity 600 through the first radial through hole 117.

[0206] Among them, such as Figure 5 , Figure 9 , Figure 12 and Figure 13As shown, another path of oil enters the internal flow channel 301 of the reducer housing 300 through the connecting hole 208 of the middle partition 200 via the second internal flow channel 104 of the motor housing 100. It then enters the internal flow channel 205 of the middle partition 200 via the oil outlet hole 303 of the internal flow channel 301 of the reducer housing 300. The oil is then output from the second oil outlet hole 203 through the internal flow channel 205 of the middle partition 205 to cool the other side 1106 of the rotor 1102 of the drive motor 11. After that, it enters the bottom of the second section of the motor cavity 402 and enters the motor oil storage cavity 601 through the second radial through hole 118. The internal flow channel 205 of the partition plate 200 can also transport oil to the third oil outlet 210 for lubrication of the bearing 1204 of the planetary carrier 1201 of the planetary reducer 12, and then enter the bottom of the first reducer cavity 501 and enter the reducer oil storage cavity 602 of the dry oil storage cavity 600 through the third radial through hole 314.

[0207] like Figure 5 , Figure 9 , Figure 12 and Figure 13 As shown, after the other oil input enters the internal flow channel 301 of the reducer housing 300, it can also flow sequentially through the third internal flow channel 305 and the fourth internal flow channel 306 of the reducer housing 300. Through the fourth internal flow channel 306, the oil is transported to the fourth oil outlet 308 and the sixth oil outlet 311. The fourth oil outlet 308 is used to output oil to lubricate another bearing 1205 of the planetary carrier 1201 of the planetary reducer 12. The sixth oil outlet 311 is used to output oil to cool and lubricate at least one of the planetary reducer 12 or the differential 14. Then it enters the bottom of the second section reducer cavity 502, flows from the second section reducer cavity 502 into the first section reducer cavity 501, and then flows out through the third radial through hole 314 to the reducer oil storage cavity 602 of the dry oil storage cavity 600.

[0208] like Figure 14 and Figure 17 As shown, the oil in the reducer oil reservoir 602 can be input to the motor oil reservoir 601 through the connecting hole 208 of the partition plate 200. Then, the oil in the motor oil reservoir 601 is re-input into the oil circuit of the power assembly 10 housing 10a through the oil suction hole 1165 and the oil suction pipe 1164, which are directly connected to the motor oil reservoir 601, so as to realize oil circulation.

[0209] The oil cooling circulation in this design allows for direct cooling of the drive motor 11 and planetary reducer 12 via the oil circuit of the powertrain housing 10a. This facilitates fully active cooling and lubrication of the powertrain 10, improving its cooling and lubrication efficiency. The oil circuit design of the housing 10a allows for precise control of oil flow and distribution, ensuring efficient operation of the powertrain 10's oil cooling system under high speed and heavy load conditions. Furthermore, the dry oil reservoir 600 (motor oil reservoir 601 and reducer oil reservoir 602) receives and stores oil from the motor cavity 400 and reducer cavity 500, preventing oil accumulation and preventing oil from submerging the air gap between the rotor 1102 and stator 1101 of the drive motor 11. This also prevents oil churning in the planetary reducer 12 gear set, effectively reducing oil churning losses in the powertrain 10, improving its efficiency, and enhancing its overall performance.

[0210] The powertrain and electric vehicle provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and embodiments of this application. The description of the embodiments above is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in specific embodiments and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A powertrain, characterized in that, The powertrain includes a motor cavity, a reducer cavity, and a dry oil reservoir. The motor cavity houses the stator and rotor of the drive motor. The reducer cavity houses the planetary reducer. The drive motor drives the wheels of the electric vehicle via the planetary reducer. The dry oil reservoir stores oil flowing out of the motor cavity and the reducer cavity under gravity. The dry oil reservoir also supplies oil to the oil pump of the powertrain. The dry oil reservoir includes a motor oil reservoir and a reducer oil reservoir. The motor reservoir and the reducer reservoir are adjacent to each other along the axial direction of the drive motor. The motor oil reservoir and the motor reservoir are adjacent to each other along the radial direction of the drive motor. The reducer oil reservoir and the reducer reservoir are adjacent to each other along the radial direction of the drive motor. The motor oil reservoir and the motor reservoir are directly connected along the radial direction of the drive motor. The reducer oil reservoir and the reducer reservoir are directly connected along the radial direction of the drive motor. The motor oil reservoir and the reducer oil reservoir are connected along the axial direction of the drive motor.

2. The powertrain according to claim 1, characterized in that, The motor cavity includes a first motor cavity and a second motor cavity. The first motor cavity and the second motor cavity are distributed on both sides of the stator of the drive motor along the axial direction of the drive motor. The first motor cavity and the second motor cavity are directly connected to the motor oil storage cavity along the radial direction of the drive motor.

3. The powertrain according to any one of claims 1-2, characterized in that, The reducer cavity includes a first reducer cavity and a second reducer cavity. The first reducer cavity is used to accommodate the first planetary gear set of the planetary reducer, and the second reducer cavity is used to accommodate the second planetary gear set of the planetary reducer. The first planetary gear set is used to drive the drive motor and the second planetary gear set. At least one of the first reducer cavity or the second reducer cavity is directly connected to the reducer oil reservoir along the radial direction of the drive motor.

4. The powertrain according to claim 3, characterized in that, Along the axial direction of the drive motor, the first section of the reducer cavity is arranged between the motor cavity and the second section of the reducer cavity, and the reducer oil reservoir cavity is directly connected to the first section of the reducer cavity along the radial direction of the drive motor.

5. The powertrain according to any one of claims 3-4, characterized in that, The length of the reducer oil reservoir along the axial direction of the drive motor is less than or equal to the length of the reducer cavity. One end of the reducer oil reservoir is flush with one end of the reducer cavity. One end of the reducer oil reservoir is used to connect to the motor oil reservoir along the axial direction of the drive motor. The other end of the reducer oil reservoir is used to directly connect to the first section of the reducer cavity along the radial direction of the drive motor.

6. The powertrain according to any one of claims 3-5, characterized in that, The first section of the reducer cavity and the second section of the reducer cavity are directly connected along the axial direction of the drive motor. The inner diameter of the first section of the reducer cavity is larger than the inner diameter of the second section of the reducer cavity. The reducer oil storage cavity is used to receive the oil flowing from the second section of the reducer cavity into the first section of the reducer cavity under the action of gravity through the first section of the reducer cavity.

7. The powertrain according to any one of claims 3-6, characterized in that, The cavity wall of the second reducer cavity also includes a plurality of oil guide grooves, which are distributed at intervals along the circumference of the drive motor. One end of each oil guide groove facing the first reducer cavity is used to directly connect to the first reducer cavity along the axial direction of the drive motor.

8. The powertrain according to any one of claims 3-7, characterized in that, The cavity wall of the second reducer cavity includes a mounting groove for fixing the gear ring of the second planetary gear set. The mounting groove includes multiple grooves, each groove for accommodating the embedding of the gear ring in the second planetary gear set. The multiple grooves are distributed at intervals along the circumference of the drive motor. At least one of the adjacent grooves has a radial depth greater than the radial depth of the other grooves.

9. The powertrain according to any one of claims 3-8, characterized in that, The reducer cavity further includes a third reducer cavity, which is distributed on both sides of the second reducer cavity along with the first reducer cavity. The inner diameter of the second reducer cavity is larger than the inner diameter of the third reducer cavity. The cavity wall of the third reducer cavity includes an oil collection groove. The distance between one end of the oil collection groove and the axis of the drive motor is smaller than the distance between the other end of the oil collection groove and the axis of the drive motor. Under the action of gravity, the oil in the oil collection groove flows from one end of the oil collection groove to the other end.

10. The powertrain according to any one of claims 1-9, characterized in that, The powertrain housing includes a motor housing, a central partition, and a reducer housing. The two sides of the central partition are respectively used to fit the mounting surfaces of the motor housing and the reducer housing, wherein: The motor housing includes a motor slot and a motor oil return slot. The slot opening of the motor slot faces the same direction as the slot opening of the motor oil return slot. The slot opening of the motor slot is used to assemble the stator and rotor of the drive motor. The partition plate is used to enclose the slot opening of the motor slot to form the motor cavity. The reducer housing includes a reducer groove and a reducer oil return groove. The groove opening of the reducer groove faces the same direction as the groove opening of the reducer oil return groove. The groove opening of the reducer groove is used to assemble the gear set of the planetary reducer. The middle partition is used to surround the groove opening of the reducer groove to form the reducer cavity. The partition plate also includes a connecting hole, which is used to connect the slot of the motor oil return groove and the slot of the reducer oil return groove along the axial direction of the drive motor to form the dry oil storage chamber.

11. The powertrain according to claim 10, characterized in that, The motor housing includes a first radial through hole and a second radial through hole. The first radial through hole and the second radial through hole are respectively used to penetrate the common housing portion of the motor slot and the motor oil return slot along the radial direction of the drive motor. The distance between the first radial through hole and the second radial through hole along the axial direction of the drive motor is greater than the axial dimension of the stator of the drive motor and less than the length of the motor oil return slot. The common housing portion of the motor slot and the motor oil return slot includes a notch. The partition plate is used to enclose the notch to form the second radial through hole.

12. The powertrain according to any one of claims 10-11, characterized in that, The reducer housing includes a third radial through hole, which penetrates the common housing portion of the reducer slot and the reducer oil return slot along the radial direction of the drive motor. The distance between the third radial through hole and the slot opening of the reducer slot along the axial direction of the drive motor is less than the length of the reducer oil return slot.

13. The powertrain according to any one of claims 10-12, characterized in that, The oil return groove of the motor includes a first groove wall and a second groove wall, which are spaced apart circumferentially along the drive motor. The first section of the tank wall includes a fixing structure for fixing a magnet, which is used to adsorb impurities in the oil. The second section of the tank wall includes an oil suction pipe and an oil suction hole. The oil suction pipe is used to connect to the oil pump of the powertrain. The extension direction of the oil suction pipe is parallel to the motor return oil tank, and the extension direction of the oil suction hole is perpendicular to the oil suction pipe.

14. The powertrain according to any one of claims 10-13, characterized in that, The wall of at least one of the motor oil return tank or the reducer oil return tank includes an oil guiding structure, which is used to allow the oil stored in the motor oil return tank to flow toward the opening of the motor oil return tank under the action of gravity, or to allow the oil stored in the reducer oil return tank to flow toward the opening of the reducer oil return tank under the action of gravity.

15. An electric vehicle, characterized in that, The electric vehicle includes wheels and a powertrain as described in any one of claims 1-14, the powertrain being used to drive the wheels.

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