Dual-motor powertrain with housing-integrated flow channel and vehicle

Abstract

A dual-motor powertrain (10) with housing-integrated flow channel, comprising an electromotor (11), a generator (12) and an integrated die-cast housing (100). The integrated housing (100) comprises an internal flow channel (140) and two recesses (110a, 110b); the internal flow channel (140) is used for transmitting cooling liquid, one recess (110a) is used for fixing a stator of the electromotor (11), the other recess (110b) is used for fixing a stator of the generator (12), the inner recess wall of each recess (110a, 110b) comprises a stator liquid outlet hole (113), and each stator liquid outlet hole (113) is in communication with the internal flow channel (140) to receive the cooling liquid. By integrating the internal flow channel in the integrated housing, less external pipelines need to be arranged, the occupied space is reduced, the integration level is improved, the miniaturized layout is facilitated, die-casting materials can be saved, and the cost is reduced. The cooling liquid is used for carrying out parallel cooling on the stator of the generator and the stator of the electromotor, so that the system flow resistance can be reduced, the power loss is reduced, and the cooling efficiency is improved. Also provided is a vehicle (1).

Description

Dual-motor powertrain and vehicle with integrated flow channels in housing

[0001] This application claims priority to Chinese Patent Application No. 202410488488.0, filed on April 22, 2024, entitled "Dual-motor powertrain with integrated flow channel in housing and vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of electric vehicle technology, and in particular to a dual-motor powertrain and vehicle with an integrated flow channel in the housing. Background Technology

[0003] Hybrid vehicles, with their energy-saving and low-emission features, are gradually becoming the mainstream in the market. However, in hybrid vehicles, the powertrain includes a generator and an electric motor, and the cooling system design for these components still suffers from problems such as low cooling efficiency and high energy consumption. Therefore, designing a high-efficiency hybrid oil-cooling system is of great significance for improving vehicle performance, reducing energy consumption, and enhancing the user experience. However, current hybrid oil-cooling systems primarily place the cooling pipes externally within the powertrain housing, resulting in high pipe component costs, a large overall powertrain size, and poor overall powertrain reliability. Summary of the Invention

[0004] This application provides a dual-motor powertrain and vehicle with an integrated flow channel in the housing.

[0005] In a first aspect, embodiments of this application provide a dual-motor powertrain with an integrated flow channel in the housing. The dual-motor powertrain includes a motor, a generator, and an integrally die-cast housing. The integrated housing includes an internal flow channel and two grooves. The internal flow channel is used to transport coolant. One groove is used to fix the stator of the motor, and the other groove is used to fix the stator of the generator. The inner wall of each groove includes a stator outlet hole, and each stator outlet hole is used to connect to an internal flow channel to receive coolant.

[0006] In this embodiment, an integrated housing is used to house an electric motor and a generator. The integrated housing is integrally die-cast, which simplifies the manufacturing process and also helps to improve the structural stability and integration of the dual-motor powertrain.

[0007] In this embodiment, an integrated housing includes an internal flow channel. This internal flow channel is integrated into the housing, which helps reduce the arrangement of external pipes, increases the integration density of the housing, reduces the space occupied by the internal flow channel on the exterior of the housing, enables a miniaturized layout of the dual-motor powertrain, and also saves on die-casting material, reducing costs. The internal flow channel is used to transport coolant and circulate coolant to cool the motor and generator inside the integrated housing, preventing overheating and ensuring normal operation of the generator and motor.

[0008] In this embodiment, an integrated housing includes two recesses: one for fixing the stator of an electric motor and the other for fixing the stator of a generator. The inner wall of each recess includes a stator outlet hole, allowing coolant in an internal flow channel to flow into both recesses to cool the stators of both the electric motor and the generator. Each stator outlet hole connects to an internal flow channel to receive coolant, allowing coolant in the internal flow channel to flow into the stator outlet holes of the two recesses respectively. This achieves parallel cooling of both the generator and electric motor stators within a single internal flow channel, improving the cooling efficiency of the dual-motor powertrain. Compared to using a series flow channel to sequentially cool the stators of both the generator and the electric motor, parallel cooling channels also reduce system flow resistance, power loss, and improve the oil pump's pumping capacity, further enhancing the cooling efficiency of the dual-motor powertrain.

[0009] In one embodiment, each groove includes an axial groove bottom and a circumferential groove wall. A stator outlet hole penetrates the circumferential groove wall of one groove along the radial direction of an electric motor. Another stator outlet hole penetrates the circumferential groove wall of the other groove along the radial direction of a generator.

[0010] In the embodiments of this application, each groove includes an axial groove bottom and a circumferential groove wall. The circumferential groove wall of one groove is used to fix the stator of an electric motor, and the circumferential groove wall of another groove is used to fix the stator of a generator.

[0011] In this embodiment, a stator outlet hole penetrates the circumferential wall of a groove along the radial direction of an electric motor. This allows coolant entering from the stator outlet hole to be sprayed onto the outer circumferential surface of the motor stator, increasing the spray area and thus the cooling area of ​​the motor stator, which is beneficial for improving the cooling efficiency of the motor. If the stator outlet hole penetrates only the axial bottom of the groove, more coolant is sprayed onto the end face of the motor stator, resulting in a poor cooling effect and hindering the improvement of cooling efficiency.

[0012] In this embodiment, along the radial direction of one generator, another stator outlet penetrates the circumferential wall of another groove. This allows coolant entering from the other stator outlet to be sprayed onto the outer circumferential surface of the generator stator, increasing the spray area and thus the cooling area of ​​the generator stator, which is beneficial for improving the cooling efficiency of the generator. If the other stator outlet penetrates only the axial bottom of the groove, more coolant is sprayed onto the end face of the generator stator, resulting in a poor cooling effect and hindering the improvement of cooling efficiency.

[0013] In one embodiment, the distance between the two stator liquid outlet holes is greater than the distance between the two grooves.

[0014] In this embodiment, the distance between the two stator outlet holes is greater than the distance between the two grooves. The larger distance between the two stator outlet holes is beneficial because it allows the two stator outlet holes to be arranged at the higher part of the two grooves. This facilitates the spraying of coolant along the direction of gravity onto the stator of a generator and the stator of a motor, thereby cooling the stator of the generator and the stator of the motor. This helps to reduce power loss and also increases the area of ​​the coolant sprayed from the two stator outlet holes onto the stator of the generator and the stator of the motor, thus improving the cooling efficiency of the generator and the motor.

[0015] In one embodiment, the dual-motor powertrain includes two gear sets, with one motor driving one gear set and one generator driving the other gear set. An integrated housing includes two sides facing away from each other along the axial direction of the motor or generator. One side includes two recesses spaced apart along the radial direction of the motor or generator. The other side accommodates multiple gears from the two gear sets and includes one or more gear coolant outlets, each connecting to an internal flow channel to receive coolant.

[0016] In this embodiment, an electric motor is used to drive a gear set, which in turn drives a wheel. The gear set receives mechanical energy from the electric motor, reduces its speed, and then transmits it to the wheel, driving it to rotate. A generator is used to drive another gear set, which in turn drives a generator and an engine. The generator receives mechanical energy from the engine via the other gear set, which then drives the generator to operate.

[0017] In the embodiments of this application, an integrated housing includes two sides, which are opposite to each other along the axial direction of a motor or a generator, so that two gear sets, a generator, and a motor can be arranged on the two sides in a regular arrangement.

[0018] In this embodiment, one side includes two grooves arranged radially along a motor or generator, spaced apart. One groove is used to fix the stator of the motor, and the other groove is used to fix the stator of the generator. This arrangement of the stator of the motor and the stator of the generator along the radial direction of the motor or generator facilitates the independent operation of the motor and the generator. Furthermore, the fact that both grooves are located on one side reduces the space occupied by the generator and the motor along the axial direction of the dual-motor powertrain, thus reducing the overall volume of the dual-motor powertrain and enabling its miniaturized arrangement.

[0019] In this embodiment, another side is used to accommodate multiple gears from two gear sets. These gears are arranged opposite to a generator and an engine along the dual-motor powertrain, which facilitates a neat and orderly arrangement of the dual-motor powertrain. The other side includes one or more gear coolant outlets, each connected to an internal flow channel to receive coolant. This allows each outlet to receive coolant from an internal flow channel, providing lubrication and cooling to the multiple gears in the two gear sets. This helps ensure the normal operation of the dual-motor powertrain and improves its cooling efficiency.

[0020] In one embodiment, the dual-motor powertrain includes two drive shafts, and an integrated housing includes two drive shaft cavities, each extending through the integrated housing along the axial direction of one motor or one generator. One drive shaft cavity is used to secure the outer ring of a bearing on one drive shaft, and the drive shaft is used to drive a gear in a gear set to a rotor of a motor. The other drive shaft cavity is used to secure the outer ring of a bearing on another drive shaft, and the other drive shaft is used to drive a gear in another gear set to a rotor of a generator. The inner peripheral wall of each drive shaft cavity includes a bearing coolant outlet, and the bearing coolant outlets of the two drive shaft cavities are respectively used to connect to an internal flow channel to receive coolant.

[0021] In this embodiment, the dual-motor powertrain includes two drive shafts and an integrated housing with two drive shaft cavities. The two drive shaft cavities pass through the integrated housing along the axial direction of one motor or one generator. The two drive shaft cavities are used to accommodate one of the two drive shafts, which facilitates the transmission connection between one motor and one drive shaft, and also facilitates the transmission connection between one generator and the other drive shaft.

[0022] In this embodiment of the application, a drive shaft cavity is used to fix the outer ring of the bearing of a drive shaft, and a drive shaft is used to drive a gear in a gear set and a rotor of an electric motor. That is, a drive shaft can drive a motor and a gear set, which is beneficial for a gear in a gear set to receive the kinetic energy transmitted from the rotor of an electric motor, and after being decelerated by other gears in a gear set, the kinetic energy is finally transmitted to the wheels to drive the vehicle.

[0023] In this embodiment of the application, another drive shaft cavity is used to fix the outer ring of the bearing of another drive shaft, and another drive shaft is used to drive a gear in another gear set and a rotor of a generator. That is, another drive shaft can drive a generator and another gear set, which is beneficial for a gear in another gear set to receive kinetic energy from an engine and transmit it to a generator, driving a generator to convert kinetic energy into electrical energy to charge the power battery.

[0024] In this embodiment, the inner peripheral wall of each drive shaft cavity includes a bearing coolant outlet hole. The bearing coolant outlet holes of the two drive shaft cavities are respectively used to connect to an internal flow channel to receive coolant. This allows the coolant in one internal flow channel to cool and lubricate the bearings of one drive shaft and the other drive shaft respectively from the bearing coolant outlet holes of the two drive shaft cavities. This helps to reduce the frictional resistance of the transmission connection between a gear in one gear set and the rotor of an electric motor, and also helps to reduce the frictional resistance of the transmission connection between a gear in another gear set and the rotor of a generator. This makes the transmission process smoother and more fluid, which helps to reduce the power loss of the dual-motor powertrain and improve the working performance of the dual-motor powertrain.

[0025] In one embodiment, along the arrangement direction of the two drive shaft cavities, the opening of a bearing outlet hole on the inner peripheral wall of one drive shaft cavity faces away from the other drive shaft cavity. The distance between the two drive shaft cavities is less than the distance between the bearing outlet holes of the two drive shaft cavities.

[0026] In this embodiment, along the arrangement direction of the two drive shaft cavities, the opening of a bearing coolant outlet hole on the inner peripheral wall of one drive shaft cavity faces away from the other drive shaft cavity. The bearing coolant outlet holes of the two drive shaft cavities are respectively used to connect an internal flow channel to receive coolant. This facilitates the arrangement of an internal flow channel between the two bearing coolant outlet holes, and allows the coolant in the internal flow channel to be transported to the two bearing coolant outlet holes via a shorter path, thereby cooling and lubricating the bearings of one drive shaft and the bearings of the other drive shaft, and improving the cooling efficiency of the dual-motor powertrain.

[0027] In this embodiment, the distance between the two drive shaft cavities is less than the distance between the bearing coolant outlets of the two drive shaft cavities. This means that one bearing coolant outlet in one drive shaft cavity can be closer to the interior of that cavity, facilitating closer contact between the outlet and the bearing. This allows all the coolant received from the internal flow channel of one outlet to be sprayed onto the bearing of that drive shaft, providing cooling and lubrication. Similarly, the other bearing coolant outlet in the other drive shaft cavity can be closer to the interior of that cavity, again facilitating closer contact between the outlet and the bearing. This also allows all the coolant received from the internal flow channel of that outlet to be sprayed onto the bearing of that drive shaft, providing cooling and lubrication. In this embodiment, the opening of the other bearing coolant outlet faces downwards along the direction of gravity, ensuring smoother coolant flow and achieving cooling and lubrication of the bearing of the other drive shaft.

[0028] In one embodiment, a gear-type fluid outlet is used to fix a fuel injector, and the distance between the gear-type fluid outlet and each drive shaft cavity is less than the distance between two drive shaft cavities. The diameter of the gear-type fluid outlet is larger than the diameters of the other gear-type fluid outlets.

[0029] In this embodiment, a gear outlet hole is used to fix a fuel injector, and a fuel injector is used to receive coolant in an internal flow channel and spray the coolant to multiple gears of the two gear sets for cooling and lubrication, which helps to reduce the frictional resistance between gears and reduce power loss.

[0030] In this embodiment, the distance between the coolant outlet of one gear and each drive shaft cavity is less than the distance between two drive shaft cavities. Placing a fuel injector between two drive shaft cavities facilitates the placement of the fuel injector between two gear sets. This allows the coolant in the fuel injector to simultaneously cool and lubricate the gears in one gear set via a shorter path, improving cooling and lubrication efficiency. It also allows the fuel injector to avoid interfering with the gear arrangement of the two gear sets, ensuring the normal rotation of multiple gears within each set and resulting in a more orderly and rational arrangement of the two gear sets and the fuel injector.

[0031] In this embodiment, the diameter of the coolant outlet of one gear is larger than that of the coolant outlets of other gears, thereby allowing more coolant to flow through one fuel injector. This facilitates the application of more coolant by one fuel injector to spray more coolant onto multiple gears of a gear set, thereby cooling and lubricating the multiple gears of the gear set and improving the cooling efficiency of the dual-motor powertrain.

[0032] In one embodiment, the dual-motor powertrain includes two intermediate shafts, and an integrated housing includes two intermediate shaft cavities, each extending through the integrated housing along the axial direction of one motor or generator. One intermediate shaft cavity is used to secure the outer ring of a bearing on one intermediate shaft, and the intermediate shaft is used to drive a drive shaft and a large disc gear. The other intermediate shaft cavity is used to secure the outer ring of a bearing on another intermediate shaft, and the other intermediate shaft is used to drive a drive shaft and an engine shaft. Another side also includes two oil guide ribs, each rib connected to the outer peripheral wall of one intermediate shaft cavity. The inner peripheral wall of each intermediate shaft cavity includes an opening adjacent to an oil guide rib, and the oil guide rib guides coolant through the opening into the intermediate shaft cavity connected to it.

[0033] In this embodiment, the dual-motor powertrain includes two intermediate shafts, and an integrated housing includes two intermediate shaft cavities. The two intermediate shaft cavities each penetrate the integrated housing along the axial direction of one motor or one generator. One intermediate shaft cavity is used to accommodate one intermediate shaft, and the other intermediate shaft cavity is used to accommodate the other intermediate shaft.

[0034] In this embodiment, an intermediate shaft cavity is used to fix the outer ring of a bearing of an intermediate shaft. An intermediate shaft is used to drive a transmission shaft and a large disc gear, allowing the intermediate shaft to transmit the kinetic energy from the rotor of an electric motor received by the transmission shaft to the large disc gear, which in turn drives the wheels to rotate. This allows the kinetic energy transmitted from the rotor of the electric motor to be decelerated via an intermediate shaft before being transmitted to the wheels, thus driving the vehicle.

[0035] In this embodiment of the application, another intermediate shaft cavity is used to fix the outer ring of the bearing of another intermediate shaft. The other intermediate shaft is used to drive another drive shaft and an engine shaft, so that the other intermediate shaft receives kinetic energy from an engine shaft and transmits it to another drive shaft, thereby driving the rotor of a generator to rotate, so that the generator converts kinetic energy into electrical energy to charge the power battery.

[0036] In this embodiment, the other side also includes two oil guide ribs, so that the two oil guide ribs and the multiple gears of the two gear sets are arranged on the same side. This is beneficial for guiding the coolant in the inner cavity of the integrated housing stirred up by the rotation of the two gear sets through the two oil guide ribs, guiding the coolant to be delivered to the two intermediate shaft cavities for cooling and lubrication of the bearings of the two intermediate shafts in the two intermediate shaft cavities. It is also beneficial for the coolant sprayed by one nozzle to be guided from the oil guide ribs to the two intermediate shaft cavities for cooling and lubrication of the bearings of the two intermediate shafts.

[0037] In this embodiment, each oil guide rib is connected to the outer peripheral wall of an intermediate shaft cavity. The inner peripheral wall of each intermediate shaft cavity includes an opening. An opening is adjacent to an oil guide rib. An oil guide rib is used to guide coolant through an opening into an intermediate shaft cavity connected to it. Each oil guide rib can receive coolant from a fuel injector or multiple gear outlet holes. An opening is adjacent to an oil guide rib, so that coolant flowing from the outer peripheral wall of one intermediate shaft cavity through the oil guide rib can flow into one intermediate shaft cavity through an opening to cool and lubricate the bearing in one intermediate shaft cavity. It also allows coolant flowing from the outer peripheral wall of another intermediate shaft cavity through the oil guide rib to flow into another intermediate shaft cavity through another opening to cool and lubricate the bearing in the other intermediate shaft cavity.

[0038] In one embodiment, two oil guide ribs are arranged between the two intermediate shaft cavities along the arrangement direction of the two intermediate shaft cavities. The distance between the two openings in the two intermediate shaft cavities is less than the distance between the axes of the two intermediate shaft cavities.

[0039] In this embodiment, along the arrangement direction of the two intermediate shaft cavities, an internal flow channel is arranged between the two intermediate shaft cavities, and two oil guide ribs are arranged between the two intermediate shaft cavities. This arrangement of the two oil guide ribs on both sides of the internal flow channel facilitates the flow of coolant from the internal flow channel into the two intermediate shaft cavities, improving cooling efficiency. Furthermore, the arrangement of the two oil guide ribs does not affect the layout of the two gear sets, and they fully utilize the space between the two intermediate shaft cavities. A shorter path can also be used to deliver coolant to the two intermediate shaft cavities via the oil guide ribs, further improving cooling efficiency, saving material for the guide ribs, and reducing production costs.

[0040] In this embodiment, the distance between the two openings of the two intermediate shaft cavities is less than the distance between the axes of the two intermediate shaft cavities. That is, the two openings of the two intermediate shaft cavities are arranged on the side of the two intermediate shaft cavities close to an internal flow channel. This is beneficial for the two openings to receive the coolant guided by the two oil guide ribs more quickly and deliver it into the two intermediate shaft cavities to cool and lubricate the bearings of the two intermediate shafts.

[0041] In one embodiment, the integrated housing further includes another internal flow channel and an oil pump slot. The other internal flow channel connects to an oil pump slot, which houses an oil pump. The oil pump receives coolant through the other internal flow channel and discharges coolant through the other internal flow channel.

[0042] In this embodiment, another internal flow channel is used to supply coolant to one internal flow channel and receive coolant output from one internal flow channel, so that one internal flow channel and the other internal flow channel within the integrated housing form a loop, allowing the coolant to be recycled and reducing the amount of coolant required. It should be noted that in this embodiment, the other internal flow channel may not be a physical pipe.

[0043] In this embodiment, another internal flow channel is used to connect to an oil pump tank, an oil pump tank is used to accommodate an oil pump, an oil pump is used to receive coolant through the other internal flow channel and to output coolant through the other internal flow channel, and an oil pump is used to provide hydraulic pressure to the coolant flowing into the oil pump in the other internal flow channel, so that the coolant can be pumped from the oil pump into the internal flow channel, so that the coolant can flow in the internal flow channel, thereby allowing the coolant in the internal flow channel to cool and reduce the temperature of the stator of a generator and the stator of a motor, and to cool and lubricate the bearings of multiple gears of two gear sets, two intermediate shafts and two transmission shafts.

[0044] In one embodiment, the inner wall of each groove further includes a return hole, and the two return holes of the two grooves are used to respectively deliver coolant to another internal flow channel. The distance between the two return holes along the radial direction of a generator or an electric motor is greater than the distance between the stator of the electric motor and the stator of the generator.

[0045] In this embodiment, the inner wall of each groove also includes a return hole. The two return holes of the two grooves are used to respectively deliver coolant to another internal flow channel. One groove is used to fix the stator of a motor, and the other groove is used to fix the stator of a generator. This allows the coolant used to cool the stator of the generator and the stator of the motor to be recovered and recycled, which helps to reduce the amount of coolant required. The other internal oil channel includes a flow channel between the two return holes and the inlet of an oil pump slot, and the other internal oil channel includes a space within the reducer housing cavity.

[0046] In this embodiment, the distance between the two return holes along the radial direction of a generator or an electric motor is greater than the distance between the stator of the electric motor and the stator of the generator. This means that the two return holes can be arranged in two grooves near the stator of the electric motor and the stator of the generator, respectively. This facilitates the return of coolant in the two grooves to another internal flow channel under the action of gravity, which helps to reduce power loss and realize the recycling of coolant.

[0047] In this embodiment, the coolant in the oil pump tank flows sequentially through an internal flow channel, two return holes in two grooves, and another internal flow channel, before flowing back to an oil pump tank to form a circulation.

[0048] In one embodiment, the integrated housing further includes a main oil port and two secondary oil ports. The main oil port connects the two secondary oil ports through an internal flow channel. The opening of the main oil port and the opening of each secondary oil port are used to accommodate a sealing element. The main oil port and the two secondary oil ports are arranged on opposite sides of two recesses along the radial direction of a generator or an electric motor.

[0049] In this embodiment of the application, an integrated housing further includes a main oil port and two secondary oil ports. The main oil port is used to receive coolant from another internal flow channel into an internal flow channel and to transport the coolant to the two secondary oil ports. The two secondary oil ports form two parallel oil circuits, which is beneficial for coolant diversion, reducing coolant flow resistance, improving the pumping capacity of the oil pump, and improving the cooling efficiency of the dual-motor powertrain.

[0050] In this embodiment, a main oil hole connects two secondary oil holes via an internal flow channel. The opening of the main oil hole and the openings of each secondary oil hole accommodate a sealing component. The opening of the main oil hole facilitates machining the main oil hole from the outside of the integrated housing inwards, and the openings of each secondary oil hole facilitate machining each secondary oil hole from the outside of the integrated housing inwards. In one embodiment, the opening of the main oil hole and the main oil passage are integrally die-cast, eliminating the need for separate machining of the main oil hole opening and the main oil hole itself, thus saving process steps and reducing the manufacturing difficulty of the main oil hole. The sealing component is located in the opening of a main oil hole to seal the main oil hole and prevent oil leakage from the main oil hole.

[0051] In one embodiment, the opening orientation of a main oil hole is opposite to the opening orientation of one of the two secondary oil holes, and the opening orientation of the other of the two secondary oil holes intersects with the opening orientation of a main oil hole. The distance between a main oil hole and any one of the two secondary oil holes is greater than the inner diameter of each groove. The distance between a main oil hole and a secondary oil hole is greater than the distance between a main oil hole and a stator outlet hole in a groove. The distance between a main oil hole and another secondary oil hole is greater than the distance between a main oil hole and a stator outlet hole in another groove.

[0052] In this embodiment, the opening orientation of a main oil hole is opposite to the opening orientation of one of the two secondary oil holes. This allows the integrated housing to be machined from two opposing directions to form a portion of an internal flow channel, which helps to shorten the draft path, reduce drafting difficulty, and improve the reliability of the integrated housing. The opening orientation of the other of the two secondary oil holes intersects with the opening orientation of a main oil hole, meaning that the opening orientation of one secondary oil hole also intersects with the opening orientation of another secondary oil hole. This allows the coolant in an internal flow channel to be split during its flow into the two secondary oil holes after flowing through a main oil hole. This helps to reduce the flow resistance of the coolant in an internal flow channel, reduce power loss, and also facilitates parallel cooling of the stator of a generator and the stator of a motor, shortening the coolant flow path and improving cooling efficiency. Furthermore, the opening orientation of a main oil hole is opposite to the opening orientation of one of the two secondary oil holes, and the opening orientation of the other of the two secondary oil holes intersects with the opening orientation of a main oil hole. It is beneficial to process one main oil hole and two secondary oil holes from different directions of the integrated shell, which helps to ensure the overall structural strength of the integrated shell and prevents the strength of a certain part of the integrated shell from being low, thus reducing the overall structural strength of the integrated shell.

[0053] In this embodiment, the distance between the main oil hole and either of the two secondary oil holes is greater than the inner diameter of each groove. This arrangement facilitates the placement of the main oil hole and the two secondary oil holes on opposite sides of the two grooves, with the main oil hole positioned in the middle of the adjacent side of the two grooves. This also helps ensure that the machining and casting of the main oil hole does not adversely affect the two grooves. Furthermore, it allows the coolant to enter an internal flow channel from one main oil hole and then be sprayed onto the two gear sets via gear outlets, bearing outlets, and nozzles, providing cooling and lubrication to both gear sets and bearings. The arrangement of the two secondary oil holes on opposite sides of the two grooves facilitates the layout of the secondary oil hole pipelines and allows the two secondary oil holes to transport coolant from the outside of the two grooves into the two grooves, thereby cooling the stator of the generator and the stator of the motor. This also increases the spray and cooling area of ​​the coolant, improving the cooling effect of the dual-motor powertrain.

[0054] In this embodiment, the distance between a main oil hole and a secondary oil hole is greater than the distance between a main oil hole and a stator outlet hole in a groove. A smaller distance between a main oil hole and a stator outlet hole in a groove facilitates arranging the stator outlet hole on the inner wall of the groove, spraying coolant onto the stator of a motor, and cooling the stator. A larger distance between a main oil hole and a secondary oil hole facilitates arranging the secondary oil hole on the outer side of the groove, allowing for machining of the secondary oil hole from the outer side of the integrated housing inwards, without affecting the structural strength of the groove.

[0055] In this embodiment, the distance between a main oil hole and a secondary oil hole is greater than the distance between a main oil hole and a stator outlet hole in another groove. This facilitates arranging a stator outlet hole on the inner wall of the other groove, spraying coolant onto the stator of a generator, and cooling the stator. The larger distance between the main oil hole and the secondary oil hole also facilitates arranging the secondary oil hole on the outside of the other groove, allowing it to be machined from the outside of the integrated housing inwards without affecting the structural strength of the other groove.

[0056] In one embodiment, an integrated housing includes two mounting surfaces opposite each other along the axial direction of a generator or an electric motor. Each mounting surface is used to secure a cover plate. At least one mounting surface includes two oil holes for communicating with an internal oil passage and an internal oil passage of a cover plate. The openings of the two oil holes along the axial direction of the electric motor or generator face a cover plate.

[0057] In this embodiment, each mounting surface is used for fixed connection with a cover plate. Each mounting surface can be a plane or a surface with concave and convex shapes, as long as each mounting surface can be fixed with a cover plate. For example, one mounting surface of the integrated housing and the mounting surface of the cover plate are both planes. For example, one mounting surface of the integrated housing and the mounting surface of the cover plate have a concave-convex fit.

[0058] In the embodiments of this application, at least one mounting surface includes two oil holes. The two oil holes are used to connect an internal flow channel and an internal oil channel of a cover plate, so that the coolant in an internal flow channel of an integrated housing can flow into the internal oil channel of a cover plate, so that the internal components near the cover plate can be lubricated and cooled down. This is beneficial to making the cooling and lubrication pipes inside the dual-motor powertrain more complete and improving the cooling and lubrication efficiency of the dual-motor powertrain.

[0059] In the embodiments of this application, the internal oil passages of a cover plate are die-cast into a cover plate, which helps to reduce the pipeline layout outside the cover plate, reduce the overall volume of the dual-motor powertrain, save die-casting materials, and reduce production costs.

[0060] In this embodiment, the openings of two oil holes along the axial direction of a motor or a generator face a cover plate, which facilitates the smoother flow of coolant from the two oil holes into the internal oil passages of the cover plate.

[0061] Secondly, embodiments of this application provide a vehicle, which includes a frame and a dual-motor powertrain as described above. The frame is used to fix the dual-motor powertrain. One motor in the dual-motor powertrain is connected to a wheel via a gear set in the dual-motor powertrain. A generator in the dual-motor powertrain is connected to an engine via another gear set in the dual-motor powertrain.

[0062] In this embodiment, an integrated housing of the dual-motor powertrain houses one electric motor, one generator, one gear set, and another gear set. By integrating an internal flow channel within this housing, the arrangement of external piping can be reduced, increasing the integration density of the housing and improving the reliability of the dual-motor powertrain. It also reduces the space occupied by the internal flow channel outside the housing, enabling a miniaturized layout of the dual-motor powertrain. Furthermore, it saves on die-casting material for the housing, reducing costs. The internal flow channel also allows for parallel cooling of the stators of both the generator and the electric motor, improving cooling efficiency and reducing system flow resistance and power loss. Attached Figure Description

[0063] 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.

[0064] Figure 1 is a structural schematic diagram of the vehicle provided in an embodiment of this application;

[0065] Figure 2 is a schematic diagram of the dual-motor powertrain provided in an embodiment of this application;

[0066] Figure 3 is a schematic diagram of the integrated housing of the dual-motor powertrain provided in an embodiment of this application;

[0067] Figure 4 is another structural schematic diagram of the integrated housing provided in an embodiment of this application;

[0068] Figure 5 is another structural schematic diagram of the integrated housing provided in an embodiment of this application;

[0069] Figure 6 is a partial enlarged view of the M1 part of the integrated housing in Figure 3;

[0070] Figure 7 is a partial enlarged view of the M2 part of the integrated housing in Figure 3;

[0071] Figure 8 is a cross-sectional view of the integrated housing along AA in Figure 3;

[0072] Figure 9 is a cross-sectional view of the integrated housing along BB in Figure 3;

[0073] Figure 10 is a cross-sectional view of the integrated housing along CC in Figure 3;

[0074] Figure 11 is a partial enlarged view of part M3 in the integrated housing in Figure 5;

[0075] Figure 12 is a cross-sectional view of the oil pump tank provided in an embodiment of this application;

[0076] Figure 13 is a structural schematic diagram of a cover plate provided in an embodiment of this application;

[0077] Figure 14 is a structural schematic diagram of another cover plate provided in an embodiment of this application. Detailed Implementation

[0078] 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.

[0079] For ease of understanding, the relevant technical terms involved in the embodiments of this application will be explained and described below.

[0080] Alignment: Alignment of two oil holes along the axial direction of a motor or generator means that the two oil holes are aligned with the central axis along the axial direction.

[0081] Offset: When two oil holes are offset along the axial direction of a motor or generator, it means that the two oil holes are not aligned with the central axis of the axial direction.

[0082] To improve the cooling efficiency of a dual-motor powertrain, reduce energy consumption, and enhance overall vehicle performance, this application provides a dual-motor powertrain with an integrated flow channel within the housing. The dual-motor powertrain includes an electric motor, a generator, and a one-piece die-cast integrated housing. The integrated housing includes an internal flow channel and two recesses. One internal flow channel is used to transport coolant, one recess is used to fix the stator of the electric motor, and the other recess is used to fix the stator of the generator. The inner wall of each recess includes a stator outlet hole, and each stator outlet hole connects to the internal flow channel to receive coolant. By integrating an internal flow channel within a single housing, the arrangement of external pipes is reduced, increasing the integration density of the housing and improving the reliability of the dual-motor powertrain. It also reduces the space occupied by the internal flow channel outside the housing, enabling a miniaturized layout of the dual-motor powertrain. Furthermore, it helps save on die-casting material for the integrated housing, reducing costs. Each groove's inner wall includes a stator outlet hole, enabling the coolant in one internal flow channel to cool the stators of a generator and a motor in parallel. This internal flow channel cools the stators of both the motor and the generator, which improves the cooling efficiency of the dual-motor powertrain and also helps reduce system flow resistance and power loss.

[0083] Please refer to Figure 1, which is a structural schematic diagram of vehicle 1 provided in this embodiment. Vehicle 1 includes a frame 20, wheels 40, a power battery 30, and a dual-motor powertrain 10. The frame 20 is used to fix the dual-motor powertrain 10, wheels 40, and power battery 30. The dual-motor powertrain 10 is connected to the wheels 40 in a transmission manner. The power battery 30 provides electrical energy to the dual-motor powertrain 10, and the dual-motor powertrain 10 can also charge the power battery 30. In this embodiment, vehicle 1 is an automobile. The dual-motor powertrain 10 can drive the wheels 40 to rotate, that is, vehicle 1 is a hybrid electric vehicle.

[0084] The following details the dual-motor powertrain 10 with integrated flow channels in the housing of this application.

[0085] Please refer to Figures 1 and 2. Figure 2 is a schematic diagram of the dual-motor powertrain 10 provided in an embodiment of this application.

[0086] In one embodiment, the dual-motor powertrain 10 includes an engine 16, an electric motor 11, a generator 12, a reducer 13, a heat exchanger, and a power supply unit 14. The engine 16 outputs power. For example, the engine 16 can be a combustion engine, including gasoline and diesel engines. The generator 12 is driven by the engine 16, providing power to the generator 12, which converts the kinetic energy output by the engine 16 into electrical energy. The generator 12 is electrically connected to a power battery 30, and can charge the power battery 30 via the power supply unit 14. The electric motor 11 is also electrically connected to the power battery 30, providing power to the electric motor 11 via the power supply unit 14. The electric motor 11 converts the electrical energy output by the power battery 30 into kinetic energy. The electric motor 11, generator 12, and reducer 13 are driven by wheels 40 to provide power to the wheels 40, driving them to move.

[0087] In one embodiment, the power supply device 14 includes at least one of a motor controller, an on-board charging device, a DC-DC converter, a DC power supply device, and a vehicle controller. The power supply device 14 is electrically connected to the engine 16, the electric motor 11, the generator 12, and the reducer 13, and is used to control the switching of the power modes of the dual-motor powertrain 10.

[0088] Please refer to Figures 3, 4, and 5. Figure 3 is a schematic diagram of the integrated housing 100 of the dual-motor powertrain 10 provided in an embodiment of this application. Figure 4 is another schematic diagram of the integrated housing 100 provided in an embodiment of this application. Figure 5 is another schematic diagram of the integrated housing 100 provided in an embodiment of this application.

[0089] In one embodiment, a dual-motor powertrain 10 with an integrated housing flow channel includes a motor 11, a generator 12, a reducer 13, an integrally die-cast integrated housing 100, and two cover plates (not shown in the figures), as shown in Figures 3 and 4. The intermediate housing can be an integrally die-cast housing. The intermediate housing can also be referred to as the integrated housing 100, the assembly housing, or the die-cast housing. A gear assembly in one of the reducers 13 is used for transmission connection with the motor 11 and the generator 12. It should be noted that the reducer 13 in Figure 3 is a schematic location of the reducer 13, and the generator 12 and motor 11 in Figure 4 are schematic locations of the generator 12 and motor 11.

[0090] In one embodiment, the integrated housing 100 and two cover plates respectively form a reducer receiving cavity 500 and a motor receiving cavity 600. The reducer receiving cavity 500 is used to receive a gear assembly of a reducer 13, and the motor receiving cavity 600 is used to receive a motor 11 and a generator 12.

[0091] In one embodiment, an integrated housing 100 includes an internal flow channel 140 and two grooves 110. The internal flow channel 140 is used to transport coolant. The two grooves 110 are referred to as groove 110a and groove 110b, respectively. Groove 110a is used to fix the stator of an electric motor 11, and groove 110b is used to fix the stator of a generator 12. The inner wall of each groove 110 includes a stator outlet hole 113, and each stator outlet hole 113 is used to connect to an internal flow channel 140 to receive coolant.

[0092] In this embodiment, an integrated housing 100 is used to accommodate an electric motor 11 and a generator 12. The integrated housing 100 is integrally die-cast, which simplifies the manufacturing process and also helps to improve the structural stability and integration of the dual-motor powertrain 10.

[0093] In this embodiment, an integrated housing 100 includes an internal flow channel 140. The internal flow channel 140 is integrated into the integrated housing 100, which helps reduce the arrangement of external pipes, improves the integration of the integrated housing 100, reduces the space occupied by the internal flow channel 140 on the exterior of the integrated housing 100, achieves a miniaturized layout of the dual-motor powertrain 10, and also helps save on die-casting material for the integrated housing 100, reducing costs. The internal flow channel 140 is used to transport coolant, and the internal flow channel 140 is used to circulate coolant to cool the motor 11 and generator 12 inside the integrated housing 100, preventing overheating of the generator 12 and motor 11 and ensuring normal operation of the generator 12 and motor 11.

[0094] In this embodiment of the application, as shown in FIG4, an integrated housing 100 includes two grooves 110. One groove 110a is used to fix the stator of a motor 11, and the other groove 110b is used to fix the stator of a generator 12. The inner wall of each groove 110 includes a stator outlet hole 113, so that the coolant in an internal flow channel 140 can flow into the two grooves 110 to cool the stator of the motor 11 and the stator of the generator 12. Each stator outlet hole 113 is used to connect to an internal flow channel 140 to receive coolant, so that the coolant in an internal flow channel 140 flows into the stator outlet holes 113 of the two grooves 110 respectively, realizing the cooling of the stator of the generator 12 and the stator of the motor 11 by the coolant in an internal flow channel 140 in a parallel flow channel manner. The internal flow channel 140 simultaneously cools the stator of the motor 11 and the stator of the generator 12, which is beneficial to improving the cooling efficiency of the dual-motor powertrain 10. Compared to using a series flow channel to cool the stator of a generator 12 and the stator of a motor 11 in sequence, parallel cooling flow channels are also beneficial to reduce system flow resistance, reduce power loss, improve the oil pumping capacity of oil pump 15, and improve the cooling efficiency of dual-motor powertrain 10.

[0095] The types of coolant include ethylene glycol-based coolant, synthetic oil, and mineral oil, which are used to cool and lubricate the components of the vehicle during operation. For example, the coolant is ethylene glycol-based coolant.

[0096] In one embodiment, the dual-motor powertrain 10 further includes an oil pump 15, as shown in FIG3. The oil pump 15 is used to deliver coolant from the oil reservoir of the reducer housing 500 through an internal flow channel 140 to the stator outlet holes 113 of the two grooves 110. The oil reservoir is located at the bottom of the reducer housing 500.

[0097] In one embodiment, each groove 110 includes an axial groove bottom 111 and a circumferential groove wall 112. As shown in FIG4, along the radial direction R1 of a motor 11, a stator outlet 113a penetrates the circumferential groove wall 112a of a groove 110a. Along the radial direction R2 of a generator 12, another stator outlet 113b penetrates the circumferential groove wall 112b of another groove 110b.

[0098] In the embodiments of this application, each groove 110 includes an axial groove bottom 111 and a circumferential groove wall 112. The circumferential groove wall 112a of one groove 110a is used to fix the stator of an electric motor 11, and the circumferential groove wall 112b of another groove 110b is used to fix the stator of a generator 12.

[0099] In this embodiment, along the radial direction R1 of a motor 11, a stator outlet 113a penetrates the circumferential groove wall 112a of a groove 110a. This allows coolant entering from the stator outlet 113a to be sprayed onto the outer circumferential surface of the stator of the motor 11, increasing the spray area of ​​the coolant and thus increasing the cooling area of ​​the stator of the motor 11, which is beneficial to improving the cooling efficiency of the motor 11. If the stator outlet 113a penetrates the axial groove bottom 111a of the groove 110a, more coolant is sprayed onto the end face of the stator of the motor 11, resulting in a poor cooling effect on the stator and hindering the improvement of cooling efficiency.

[0100] In this embodiment, along the radial direction R2 of one generator 12, another stator outlet 113b penetrates the circumferential groove wall 112b of another groove 110b. This allows the coolant entering from the other stator outlet 113b to be sprayed onto the outer circumferential surface of the stator of one generator 12, increasing the spray area of ​​the coolant and thus increasing the cooling area of ​​the stator of one generator 12, which is beneficial to improving the cooling efficiency of one generator 12. If the other stator outlet 113b penetrates the axial groove bottom 111b of another groove 110b, more coolant is sprayed onto the end face of the stator of one generator 12, resulting in a poor cooling effect on the stator of one generator 12 and hindering the improvement of cooling efficiency.

[0101] In one embodiment, as shown in FIG4, the openings of the two grooves 110 face the same direction. The stator of a generator 12 and the stator of a motor 11 are arranged on the same side along the axial direction O of the dual-motor powertrain 10, making the stator of the generator 12 and the stator of the motor 11 more compact and not occupying too much space along the axial direction O of the dual-motor powertrain 10. This is beneficial to reducing the overall volume of the dual-motor powertrain 10 and to miniaturizing the layout of the dual-motor powertrain 10.

[0102] In one embodiment, the distance between the two stator liquid outlet holes 113a and 113b is greater than the distance between the two grooves 110a and 110b.

[0103] As shown in Figure 5, in this embodiment of the application, the distance between the two stator outlet holes 113a and 113b is denoted as L1, and the distance between the two grooves 110a and 110b is denoted as L2. L1 > L2, and L1 is larger. This is beneficial because the two stator outlet holes 113a and 113b are arranged at the height of the two grooves 110a and 110b, which is beneficial because the coolant is sprayed in the direction of gravity onto the stator of a generator 12 and the stator of a motor 11. This helps to cool down the stator of a generator 12 and the stator of a motor 11, which helps to reduce power loss. It also helps to increase the area of ​​the coolant sprayed from the two stator outlet holes 113a and 113b onto the stator of a generator 12 and the stator of a motor 11, thereby improving the cooling efficiency of a generator 12 and a motor 11. It should be noted that the two stator liquid outlet holes 113a and 113b in Figure 5 are schematic positions of the two stator liquid outlet holes 113a and 113b. For the specific positions, please refer to the two stator liquid outlet holes 113a and 113b in Figure 4.

[0104] In one embodiment, the dual-motor powertrain 10 includes two gear sets 115, as shown in Figures 3 and 4. A motor 11 is used to drive one gear set 115a, and a generator 12 is used to drive the other gear set 115b. An integrated housing 100 includes two sides 160, which are opposite to each other along the axial direction O of either the motor 11 or the generator 12. One side 160a includes two recesses 110, spaced apart along the radial directions R1 and R2 of either the motor 11 or the generator 12. The other side 160b accommodates multiple gears of the two gear sets 115 and includes one or more gear coolant outlets 104, each of which connects to an internal flow channel 140 to receive coolant.

[0105] In this embodiment, an electric motor 11 is used to drive a gear set 115a. The gear set 115a connects the electric motor 11 and the wheel 40. The gear set 115a receives the mechanical energy from the electric motor 11, reduces it, and then transmits it to the wheel 40, driving the wheel 40 to rotate. A generator 12 is used to drive another gear set 115b. The other gear set 115b connects the generator 12 and an engine 16. The generator 12 receives mechanical energy from the engine 16 through the other gear set 115b, which drives the generator 12 to operate. It should be noted that the structure of the two gear sets 115 is not shown in Figure 3. The two gear sets 115 in Figure 3 are shown as schematic positions of the two gear sets 115. The structure of the two gear sets 115 can be designed as needed.

[0106] In this embodiment, an integrated housing 100 includes two sides 160, which are opposite to each other along the axial direction O of a motor 11 or a generator 12, such that two gear sets 115, a generator 12, and a motor 11 can be arranged on the two sides 160 respectively in a regular arrangement. It should be noted that the axial direction O of the dual-motor powertrain 10, the axial direction O of the motor 11, and the axial direction O of the generator 12 are parallel to each other.

[0107] In this embodiment, one side surface 160a includes two grooves 110, as shown in FIG. 4. The two grooves 110 are arranged at intervals along the radial directions R1 and R2 of one motor 11 or one generator 12. One groove 110a is used to fix the stator of one motor 11, and the other groove 110b is used to fix the stator of one generator 12. This arrangement of the stator of one motor 11 and the stator of one generator 12 at intervals along the radial directions R1 and R2 of one motor 11 or one generator 12 helps to ensure that one motor 11 and one generator 12 can operate relatively independently. In addition, the fact that both grooves 110 are arranged on one side surface 160a (as shown in FIG. 4) helps to reduce the space occupied by one generator 12 and one motor 11 along the axial direction O of the dual-motor powertrain 10, which helps to reduce the overall volume of the dual-motor powertrain 10 and facilitates the miniaturization of the dual-motor powertrain 10.

[0108] In this embodiment, another side 160b is used to accommodate multiple gears of two gear sets 115, as shown in FIG3. The multiple gears of the two gear sets 115 are arranged opposite to a generator 12 and an engine 16 along the dual-motor powertrain 10, which is beneficial for the orderly arrangement of the dual-motor powertrain 10. The other side 160b includes one or more gear coolant outlet holes 104. Each gear coolant outlet hole 104 is used to connect to an internal flow channel 140 to receive coolant, so that each gear coolant outlet hole 104 can receive coolant from an internal flow channel 140 to lubricate and cool down the multiple gears of the two gear sets 115. This is beneficial for ensuring the normal operation of the dual-motor powertrain 10 and also for improving the cooling efficiency of the dual-motor powertrain 10.

[0109] In one embodiment, the dual-motor powertrain 10 includes two drive shafts 191, and an integrated housing 100 includes two drive shaft cavities 181, as shown in FIG3. The two drive shaft cavities 181 respectively penetrate the integrated housing 100 along the axial direction of either a motor 11 or a generator 12. One drive shaft cavity 181a is used to fix the outer ring of the bearing of one drive shaft 191a, and the drive shaft 191a is used to drive a gear in a gear set 115a and the rotor of the motor 11. The other drive shaft cavity 181b is used to fix the outer ring of the bearing of another drive shaft 191b, and the other drive shaft 191b is used to drive a gear in another gear set 115b and the rotor of the generator 12. The inner peripheral wall of each drive shaft cavity 181 includes a bearing coolant outlet 105, and the bearing coolant outlets 105 of the two drive shaft cavities 181 are respectively used to connect to an internal flow channel 140 to receive coolant. It should be noted that the structure of the two drive shafts 191 is not shown in Figure 3; the two drive shafts 191 in Figure 3 are schematic positions of the two drive shafts 191.

[0110] In this embodiment, the dual-motor powertrain 10 includes two drive shafts 191, and an integrated housing 100 includes two drive shaft cavities 181. The two drive shaft cavities 181 respectively penetrate the integrated housing 100 along the axial direction of one motor 11 or one generator 12. The two drive shaft cavities 181 are respectively used to accommodate one of the two drive shafts 191, which facilitates the transmission connection between one motor 11 and one drive shaft 191a, and also facilitates the transmission connection between one generator 12 and the other drive shaft 191b.

[0111] In this embodiment, a drive shaft cavity 181a is used to fix the outer ring of the bearing of a drive shaft 191a. The drive shaft 191a is used to drive a gear in a gear set 115a and the rotor of an electric motor 11. That is, a drive shaft 191a can drive a motor 11 and a gear set 115a, which is beneficial for a gear in a gear set 115a to receive the kinetic energy transmitted from the rotor of an electric motor 11. The kinetic energy is then decelerated by other gears in the gear set 115a and finally transmitted to the wheel 40 to drive the vehicle 1.

[0112] In this embodiment, another drive shaft cavity 181b is used to fix the outer ring of the bearing of another drive shaft 191b. The other drive shaft 191b is used to drive a gear in another gear set 115b and a rotor of a generator 12. That is, the other drive shaft 191b can drive a generator 12 and another gear set 115b, which is beneficial for a gear in another gear set 115b to receive kinetic energy from an engine 16 and transmit it to a generator 12, driving the generator 12 to convert kinetic energy into electrical energy to charge the power battery 30.

[0113] In this embodiment, the inner peripheral wall of each drive shaft cavity 181 includes a bearing coolant outlet 105. The bearing coolant outlets 105 of the two drive shaft cavities 181 are respectively used to connect to an internal flow channel 140 to receive coolant, so that the coolant in the internal flow channel 140 can be supplied to the bearings of one drive shaft 191a and the other drive shaft 191b for cooling and lubrication from the bearing coolant outlets 105 of the two drive shaft cavities 181. This helps to reduce the frictional resistance of the transmission connection between a gear in one gear set 115a and the rotor of an electric motor 11, and also helps to reduce the frictional resistance of the transmission connection between a gear in another gear set 115b and the rotor of a generator 12, thereby making the transmission process smoother and more fluid, which helps to reduce the power loss of the dual-motor powertrain 10 and improve the working performance of the dual-motor powertrain 10.

[0114] In one embodiment, as shown in FIG3, an integrated housing 100 further includes a bearing outlet connection hole 106 for communicating with an internal flow channel 140, and the opening of the bearing outlet connection hole 106 is opposite to the opening direction of a bearing outlet hole 105a.

[0115] In this embodiment, a bearing outlet hole 105a of an integrated housing 100 is formed by drafting at a bearing outlet connection hole 106. An internal flow channel 140 and a bearing outlet hole 105a are connected through a bearing outlet connection hole 106, so that the coolant in the internal flow channel 140 can flow into a bearing outlet hole 105a to cool and lubricate the bearing of a drive shaft 191a.

[0116] Please refer to Figures 3 and 6, where Figure 6 is a partially enlarged view of portion M1 of the integrated housing 100 in Figure 3. In one embodiment, as shown in Figure 6, along the arrangement direction of the two drive shaft cavities 181, the opening of a bearing outlet hole 105a on the inner peripheral wall of one drive shaft cavity 181a faces away from the other drive shaft cavity 181b. The distance between the two drive shaft cavities 181 is less than the distance between the bearing outlet holes 105a of the two drive shaft cavities 181.

[0117] In this embodiment, along the arrangement direction of the two drive shaft cavities 181, the opening of a bearing outlet hole 105a on the inner peripheral wall of one drive shaft cavity 181a faces away from the other drive shaft cavity 181b. The bearing outlet holes 105 of the two drive shaft cavities 181 are respectively used to connect to an internal flow channel 140 to receive coolant. It is advantageous to arrange an internal flow channel 140 between the two bearing outlet holes 105, which is advantageous to deliver the coolant in the internal flow channel 140 to the two bearing outlet holes 105 with a shorter path, thereby cooling and lubricating the bearings of one drive shaft 191a and the other drive shaft 191b, and improving the cooling efficiency of the dual-motor powertrain 10.

[0118] In this embodiment of the application, as shown in FIG6, the distance between the two drive shaft cavities 181 is denoted as L3, and the distance between the bearing outlet holes 105 of the two drive shaft cavities 181 is denoted as L4, where L3 < L4. That is, the bearing outlet hole 105a of one drive shaft cavity 181a can be closer to the interior of one drive shaft cavity 181a. This is beneficial for the bearing outlet hole 105a to be closer to the bearing of one drive shaft 191a, and for the coolant received by one bearing outlet hole 105a from one internal flow channel 140 to be sprayed onto the bearing of one drive shaft 191a, thereby providing cooling and lubrication to the bearing of one drive shaft 191a. The other bearing coolant outlet 105b in the other drive shaft cavity 181b is positioned closer to the interior of the other drive shaft cavity 181b. This allows the other bearing coolant outlet 105b to be closer to the bearing of the other drive shaft 191b, facilitating the spraying of all the coolant received in the internal flow channel 140 onto the bearing of the other drive shaft 191b, thus providing cooling and lubrication. In this embodiment, the opening of the other bearing coolant outlet 105b faces downwards along the direction of gravity, allowing for smoother coolant discharge and achieving cooling and lubrication of the bearing of the other drive shaft 191b.

[0119] In one embodiment, a gear outlet hole 104a is used to fix a fuel injector 194, as shown in FIG6. The distance between the gear outlet hole 104a and each drive shaft cavity 181 is less than the distance between the two drive shaft cavities 181. The diameter of the gear outlet hole 104a is larger than the diameter of the other gear outlet holes 104.

[0120] In this embodiment, a gear outlet hole 104a is used to fix a fuel injector 194. The fuel injector 194 is used to receive coolant in an internal flow channel 140 and spray the coolant to multiple gears of the two gear sets 115 for cooling and lubrication, which helps to reduce the frictional resistance between gears and reduce power loss. It should be noted that the structure of a fuel injector 194 is not shown in Figure 6; the fuel injector 194 in Figure 6 is only a schematic position of a fuel injector 194.

[0121] In this embodiment, as shown in Figure 6, the distance between a gear coolant outlet 104a and a drive shaft cavity 181a is denoted as L5, the distance between a gear coolant outlet 104a and another drive shaft cavity 181b is denoted as L6, and the distance between the two drive shaft cavities 181 is L3, where L5 < L3 and L6 < L3. Arranging a fuel injector 194 between the two drive shaft cavities 181 facilitates the placement of the fuel injector 194 between the two gear sets 115. This allows the coolant in the fuel injector 194 to simultaneously cool and lubricate the gears in one gear set 115a via a shorter path, improving cooling and lubrication efficiency. It also allows the fuel injector 194 to avoid the gear arrangement of the two gear sets 115, without affecting the normal rotation of multiple gears in the two gear sets 115, resulting in a more regular and rational arrangement of the two gear sets 115 and the fuel injector 194.

[0122] In this embodiment, the diameter of one gear outlet hole 104a is larger than that of other gear outlet holes 104, thereby allowing more coolant to flow through one injector 194. This facilitates the spraying of more coolant onto the multiple gears of a gear set 115a by one injector 194, thus cooling and lubricating the multiple gears of the gear set 115a and improving the cooling efficiency of the dual-motor powertrain 10.

[0123] In one embodiment, the dual-motor powertrain 10 includes two intermediate shafts 192, as shown in FIG3. An integrated housing 100 includes two intermediate shaft cavities 182, each penetrating the integrated housing 100 along the axial direction of either a motor 11 or a generator 12. One intermediate shaft cavity 182a is used to fix the outer ring of a bearing of one intermediate shaft 192a, and the intermediate shaft 192a is used to drive a drive shaft 191a and a large disc gear 195. The other intermediate shaft cavity 182b is used to fix the outer ring of a bearing of another intermediate shaft 192b, and the other intermediate shaft 192b is used to drive a drive shaft 191b and an engine shaft (not shown). The other side 160b also includes two oil guide ribs 193a and 193b. Each oil guide rib 193a and 193b is used to connect to the outer peripheral wall of an intermediate shaft cavity 182a. The inner peripheral wall of each intermediate shaft cavity 182 includes an opening 107. An opening 107 is adjacent to an oil guide rib 193. An oil guide rib 193 is used to guide coolant through an opening 107 into an intermediate shaft cavity 182 connected thereto.

[0124] In this embodiment, the dual-motor powertrain 10 includes two intermediate shafts 192, and an integrated housing 100 includes two intermediate shaft cavities 182. The two intermediate shaft cavities 182 respectively penetrate the integrated housing 100 along the axial direction of one motor 11 or one generator 12. One intermediate shaft cavity 182a is used to accommodate one intermediate shaft 192a, and the other intermediate shaft cavity 182b is used to accommodate the other intermediate shaft 192b.

[0125] In this embodiment, an intermediate shaft cavity 182a is used to fix the outer ring of the bearing of an intermediate shaft 192a. The intermediate shaft 192a is used to drive a transmission shaft 191a and a large disc gear 195, so that the intermediate shaft 192a can transmit the kinetic energy from the rotor of an electric motor 11 received by the transmission shaft 191a to the large disc gear 195, thereby rotating the wheel. This allows the kinetic energy transmitted from the rotor of the electric motor 11 to be decelerated via the intermediate shaft 192a and then transmitted at reduced speed to the wheel 40, driving the vehicle 1. It should be noted that the structures of the two intermediate shafts 192 and the large disc gear 195 are not shown in Figure 3. The two intermediate shafts 192 in Figure 3 are schematic representations of their positions, and the large disc gear 195 is a schematic representation of its position.

[0126] In this embodiment of the application, another intermediate shaft cavity 182b is used to fix the outer ring of the bearing of another intermediate shaft 192b. The other intermediate shaft 192b is used to drive another drive shaft 191b and an engine shaft, so that the other intermediate shaft 192b receives kinetic energy from the shaft of an engine 16 and transmits it to the other drive shaft 191b, thereby driving the rotor of a generator 12 to rotate, so that the generator 12 converts kinetic energy into electrical energy to charge the power battery 30.

[0127] In this embodiment, the other side 160b also includes two oil guide ribs 193a and 193b, so that the two oil guide ribs 193a and 193b and the multiple gears of the two gear sets 115 are arranged on the same side. This facilitates the flow of coolant in the oil reservoir stirred up by the rotation of the two gear sets 115 through the two oil guide ribs 193, guiding the coolant to be delivered to the two intermediate shaft cavities 182 for cooling and lubrication of the bearings of the two intermediate shafts 192 in the two intermediate shaft cavities 182. It also facilitates the flow of coolant sprayed by one nozzle 194 from the oil guide ribs 193a and 193b to the two intermediate shaft cavities 182 for cooling and lubrication of the bearings of the two intermediate shafts 192.

[0128] In this embodiment, each oil guide rib 193a, 193b is connected to the outer peripheral wall of an intermediate shaft cavity 182. The inner peripheral wall of each intermediate shaft cavity 182 includes an opening 107. An opening 107 is adjacent to an oil guide rib 193. An oil guide rib 193 is used to guide coolant through an opening 107 into an intermediate shaft cavity 182 connected to it. Each oil guide rib 193 can receive coolant from a nozzle 194 or multiple gear outlet holes 104. 7a is adjacent to an oil guide rib 193a, so that coolant flowing from the outer peripheral wall of an intermediate shaft cavity 182a through the oil guide rib 193a can flow into an intermediate shaft cavity 182a through an opening 107a to cool and lubricate the bearing in the intermediate shaft cavity 182a. It also allows coolant flowing from the outer peripheral wall of another intermediate shaft cavity 182b through the oil guide rib 193b to flow into another intermediate shaft cavity 182b through another opening 107b to cool and lubricate the bearing in the other intermediate shaft cavity 182b.

[0129] Please refer to Figures 3 and 7. Figure 7 is a partially enlarged view of the M2 portion of the integrated housing 100 in Figure 3. In one embodiment, along the arrangement direction of the two intermediate shaft cavities 182, two oil guide ribs 193a and 193b are arranged between the two intermediate shaft cavities 182. The spacing between the two openings 107a and 107b of the two intermediate shaft cavities 182 is less than the spacing between the axes of the two intermediate shaft cavities 182.

[0130] In this embodiment of the application, as shown in FIG7, along the arrangement direction of the two intermediate shaft cavities 182, an internal flow channel 140 is arranged between the two intermediate shaft cavities 182, and two oil guide ribs 193a and 193b are arranged between the two intermediate shaft cavities 182. This arrangement of the two oil guide ribs 193a and 193b on both sides of the internal flow channel 140 facilitates the flow of coolant from the internal flow channel 140 into the two intermediate shaft cavities 182, thereby improving cooling efficiency. It also ensures that the arrangement of the two oil guide ribs 193a and 193b does not affect the layout of the two gear sets 115, and that the two oil guide ribs 193a and 193b make full use of the space between the two intermediate shaft cavities 182. The coolant can also be delivered to the two intermediate shaft cavities 182 through the oil guide ribs 193a and 193b via a shorter path, which is beneficial to improving cooling efficiency and can also save the material of the guide ribs 193a and 193b, thereby reducing production costs.

[0131] In this embodiment of the application, the distance between the two openings 107a and 107b of the two intermediate shaft cavities 182 is denoted as L7, and the distance between the axes of the two intermediate shaft cavities 182 is denoted as L8, where L7 < L8. That is, the two openings 107a and 107b of the two intermediate shaft cavities 182 are arranged on the side of the two intermediate shaft cavities 182 close to an internal flow channel 140. This is beneficial for the two openings 107a and 107b to receive the coolant guided by the two oil guide ribs 193a and 193b more quickly and deliver it into the two intermediate shaft cavities 182 to cool and lubricate the bearings of the two intermediate shafts 192.

[0132] In one embodiment, as shown in FIG7, an integrated housing 100 further includes an intermediate shaft cavity guide section 108, which is used to input coolant in an internal flow channel 140 into another intermediate shaft cavity 182b to cool and lubricate the bearing of the other intermediate shaft 192b. This helps to improve the temperature rise problem during the transmission connection between an engine shaft and another intermediate shaft 192b, and also helps to reduce frictional resistance.

[0133] In one embodiment, as shown in Figures 3 and 6, the other side 160b also includes two oil guide ribs 193c and 193d. Each oil guide rib 193c and 193d is used to connect to the outer peripheral wall of a drive shaft cavity 181. The inner peripheral wall of each drive shaft cavity 181 includes an opening 107. As shown in Figure 3, an opening 107c is adjacent to an oil guide rib 193c. An oil guide rib 193c is used to guide coolant through an opening 107c into a drive shaft cavity 181a connected to it. This is beneficial for cooling and lubricating the bearings of a drive shaft 191a and reducing the friction of the rotation of the drive shaft 191a. As shown in Figure 6, an opening 107d is adjacent to an oil guide rib 193d. The oil guide rib 193d is used to guide the coolant through the opening 107d into the cavity 181b of the other drive shaft connected to it. This is beneficial for cooling and lubricating the bearings of the other drive shaft 191b, reducing the friction of the rotation of the other drive shaft 191b, and also improving the cooling and lubrication efficiency of the dual-motor powertrain 10.

[0134] In one embodiment, as shown in FIG7, the other side 160b further includes an oil guide rib 193e. The oil guide rib 193e is used to connect to the outer peripheral wall of an output shaft cavity 183. The inner peripheral wall of the output shaft cavity 183 includes an opening 107e. The opening 107e is adjacent to the oil guide rib 193e. The oil guide rib 193a is used to guide coolant through the opening 107e into the output shaft cavity 183 connected thereto. This facilitates cooling and lubrication of the bearings of an output shaft 184, reduces the friction of the rotation of the output shaft 184, and also improves the cooling and lubrication efficiency of the dual-motor powertrain 10. It should be noted that the output shaft 184 in FIG7 is a schematic position of the output shaft 184.

[0135] In one embodiment, as shown in Figures 3, 6 and 7, the coolant input into the two drive shaft cavities 181, the two intermediate shaft cavities 182 and the output shaft cavity 183 can be directly input through the bearing outlet hole 105, or it can be input through the combination of the oil guide rib 193 and the opening 107.

[0136] In one embodiment, the integrated housing 100 further includes another internal flow channel 150 and an oil pump slot 120. As shown in Figures 3 and 5, the other internal flow channel 150 is used to connect to an oil pump slot 120, which is used to house an oil pump 15. The oil pump 15 is used to receive coolant through the other internal flow channel 150 and to discharge coolant through an internal flow channel 140.

[0137] In this embodiment, another internal flow channel 150 is used to supply coolant to one internal flow channel 140 and receive coolant output from one internal flow channel 140, so that one internal flow channel 140 and the other internal flow channel 150 within the integrated housing 100 form a loop, allowing the coolant to be recycled, which helps to reduce the amount of coolant required. It should be noted that in this embodiment, the other internal flow channel 150 may not be a physical pipe.

[0138] In this embodiment, another internal flow channel 150 is used to connect to an oil pump tank 120, which is used to house an oil pump 15. The oil pump 15 is used to receive coolant through the other internal flow channel 150 and to output coolant through an internal flow channel 140. The oil pump 15 is used to provide hydraulic pressure to the coolant flowing into the oil pump 15 in the other internal flow channel 150, so that the coolant can be pumped from the oil pump 15 into an internal flow channel 140, allowing the coolant to flow in the internal flow channel 140. This allows the coolant in the internal flow channel 140 to cool and reduce the temperature of the stator of a generator 12 and the stator of a motor 11, and to cool and lubricate the bearings of multiple gears in two gear sets 115, as well as the bearings of two intermediate shafts 192 and two drive shafts 191.

[0139] In one embodiment, the inner wall of each groove 110 further includes a return hole 114, as shown in Figures 3 and 5. The two return holes 114 of the two grooves 110 are used to deliver coolant to another internal flow channel 150, respectively. The distance between the two return holes 114 along the radial directions R1 and R2 of a generator 12 or a motor 11 is greater than the distance between the stator of the motor 11 and the stator of the generator 12.

[0140] In this embodiment, the inner wall of each groove 110 further includes a return hole 114. The two return holes 114 of the two grooves 110 are used to respectively supply coolant to another internal flow channel 150. One groove 110a is used to fix the stator of a motor 11, and the other groove 110b is used to fix the stator of a generator 12. This allows the coolant used to cool the stator of the generator 12 and the stator of the motor 11 to be recovered and recycled, which helps to reduce the amount of coolant required. The other internal flow channel 150 includes a flow channel between the two return holes 114 and the inlet of an oil pump tank 120, and the other internal flow channel 150 includes a space within the reducer housing cavity 500.

[0141] In this embodiment of the application, as shown in FIG5, along the radial directions R1 and R2 of a generator 12 or a motor 11, the distance between the two return holes 114 is denoted as L9, and the distance between the stator of a motor 11 and the stator of a generator 12 is denoted as L10, where L9 > L10. This means that the two return holes 114 can be respectively arranged in the two grooves 110 near the stator of a motor 11 and the stator of a generator 12. This facilitates the return of coolant in the two grooves 110 from the two return holes 114 to another internal flow channel 150 under the action of gravity, which helps to reduce power loss and realize the recycling of coolant.

[0142] In this embodiment, the coolant in the oil pump tank 120 flows sequentially through an internal flow channel 140, two return holes 114 of two grooves 110, and another internal flow channel 150, and then flows back to an oil pump tank 120 to form a circulation.

[0143] In one embodiment, as shown in Figures 4 and 5, two return holes 114 penetrate the integrated housing 100 along the axial direction of a generator 12 or a motor 11, and the diameter of each return hole 114 is larger than the diameter of each stator outlet hole 113.

[0144] In this embodiment, the diameter of each return hole 114 is larger than the diameter of each stator outlet hole 113, which is beneficial to allow as much coolant as possible to flow out of the two return holes 114 from the two grooves 110 to cool the stator of a generator 12 or the stator of a motor 11, thus avoiding the accumulation of oil in the two grooves 110 and improving the cooling efficiency of the dual-motor powertrain 10.

[0145] Please refer to Figures 3, 8, 9, and 10. Figure 8 is a cross-sectional view of the integrated housing 100 in Figure 3 along AA, Figure 9 is a cross-sectional view of the integrated housing 100 in Figure 3 along BB, and Figure 10 is a cross-sectional view of the integrated housing 100 in Figure 3 along CC. In one embodiment, an integrated housing 100 further includes a main oil hole 101 and two secondary oil holes 102. The main oil hole 101 is used to connect the two secondary oil holes 102 through an internal flow channel 140. The opening of the main oil hole 101 and the opening of each secondary oil hole 102 are used to accommodate a sealing element. As shown in Figure 5, along the radial directions R1 and R2 of a generator 12 or a motor 11, the main oil hole 101 and the two secondary oil holes 102 are respectively arranged on both sides of two grooves 110.

[0146] In this embodiment of the application, an integrated housing 100 further includes a main oil hole 101 and two secondary oil holes 102. The main oil hole 101 is used to receive coolant from another internal flow channel 150 into an internal flow channel 140 and to transport coolant to the two secondary oil holes 102. The two secondary oil holes 102 form two parallel oil circuits, which is beneficial for coolant diversion, reducing coolant flow resistance, improving the pumping capacity of oil pump 15, and improving the cooling efficiency of the dual motor powertrain 10.

[0147] In this embodiment, a main oil hole 101 is used to connect two secondary oil holes 102 through an internal flow channel 140. The opening of the main oil hole 101 and the opening of each secondary oil hole 102 are used to accommodate a sealing component. The opening of the main oil hole 101 facilitates the machining of the main oil hole 101 from the outside to the inside of the integrated housing 100, and the opening of each secondary oil hole 102 facilitates the machining of each secondary oil hole 102 from the outside to the inside of the integrated housing 100. In one embodiment, the opening of the main oil hole 101 and the main oil passage 141 are integrally die-cast, so that the opening of the main oil hole 101 and the main oil hole 101 do not need to be machined separately, which helps to save processes and reduce the manufacturing difficulty of the main oil hole 101. The sealing component is located in the opening of the main oil hole 101 to seal the main oil hole 101 and prevent the oil in the main oil hole 101 from leaking from the main oil hole 101.

[0148] In one embodiment, the opening of each secondary oil hole 102 and the flow channel connected to each secondary oil hole 102 are integrally die-cast, so that the opening of each secondary oil hole 102 and the flow channel connected to each secondary oil hole 102 do not need to be processed separately, which helps to save processes and reduce the processing and manufacturing difficulty of each secondary oil hole 102. The sealing component is located in the opening of each secondary oil hole 102 to seal each secondary oil hole 102 and prevent oil from leaking from each secondary oil hole 102.

[0149] In this embodiment of the application, as shown in FIG5, along the radial directions R1 and R2 of a generator 12 or a motor 11, a main oil hole 101 and two secondary oil holes 102 are respectively arranged on both sides of two grooves 110. The main oil hole 101 is arranged in the middle of the side of the two grooves 110 that are close to each other. This is beneficial to the fact that the processing and manufacturing of the main oil hole 101 will not have an adverse effect on the two grooves 110. It is also beneficial to the fact that after the coolant is pumped into an internal flow channel 140 by an oil pump 15 from a main oil hole 101, the coolant is sprayed onto the two gear sets 115 through the gear outlet hole 104, the bearing outlet hole 105, the oil injector 194, etc., to cool and lubricate the two gear sets 115 and the bearings. The two secondary oil holes 102 are arranged on both sides of the two grooves 110, which is beneficial for the arrangement of the pipelines of the two secondary oil holes 102. It is also beneficial for the two secondary oil holes 102 to transport the coolant in the internal flow channel 140 from the high position outside the two grooves 110 to the two grooves 110 respectively, so as to cool the stator of the generator 12 and the stator of the motor 11. It is beneficial to increase the spray and cooling area of ​​the coolant, improve the cooling effect of the dual motor powertrain 10, and also facilitate the input of coolant into the two grooves 110 in the direction of gravity, thereby reducing power loss.

[0150] In one embodiment, a main oil hole 101 is used to form a main oil passage 141 of an internal flow channel 140 (as shown in FIG8), and two secondary oil holes 102 are used to form two secondary oil passages 142 of an internal flow channel 140 (as shown in FIG9 and FIG10).

[0151] In this embodiment, the coolant in an internal flow channel 140 first flows into a main oil passage 141 from a main oil hole 101. Within the main oil passage 141, the coolant flows into multiple gear outlet holes 104 (as shown in Figure 3) to cool and lubricate multiple gears in two gear sets 115. The coolant then flows out through an oil injector 194 to lubricate multiple gears. The coolant in the main oil passage 141 can flow into two secondary oil passages 142. Within the two secondary oil passages 142, the coolant flows into a stator outlet hole 113 in two grooves 110 to cool the stator of a generator 12 and the stator of a motor 11. This parallel and synchronous cooling of the stator of the generator 12 and the stator of the motor 11 helps reduce coolant flow resistance and improve cooling efficiency.

[0152] In one embodiment, as shown in FIG6, a gear outlet hole 104a for fixing an injector 194 is located in a main oil passage 141, which facilitates the connection between the injector 194 and the main oil passage 141, so that the injector 194 has a larger injection pressure and a larger coolant volume, which is beneficial to improving the cooling and lubrication effect of the injector 194 on the gears of a gear set 115a.

[0153] In one embodiment, as shown in Figures 8 and 9, the opening orientation of a main oil hole 101 is opposite to the opening orientation of one of the two secondary oil holes 102a. As shown in Figures 8 and 10, the opening orientation of the other secondary oil hole 102b intersects with the opening orientation of a main oil hole 101. As shown in Figure 5, the distance between a main oil hole 101 and any one of the two secondary oil holes 102 is greater than the inner diameter of each groove 110. The distance between a main oil hole 101 and a secondary oil hole 102a is greater than the distance between a main oil hole 101 and a stator outlet hole 113a of a groove 110a. The distance between a main oil hole 101 and another secondary oil hole 102b is greater than the distance between a main oil hole 101 and a stator outlet hole 113b of another groove 110b.

[0154] In this embodiment, the opening orientation of a main oil hole 101 is opposite to the opening orientation of one of the two secondary oil holes 102a, allowing the integrated housing 100 to be machined from two opposing directions to form a portion of an internal flow channel 140. This shortens the draft path, reduces drafting difficulty, and improves the reliability of the integrated housing 100. The opening orientation of the other secondary oil hole 102b intersects with the opening orientation of a main oil hole 101, meaning the opening orientation of one secondary oil hole 102a also intersects with the opening orientation of another secondary oil hole 102a. This allows the coolant in the internal flow channel 140 to be diverted after flowing through a main oil hole 101 into the two secondary oil holes 102. This reduces the flow resistance of the coolant in the internal flow channel 140, lowers power loss, and facilitates parallel cooling of the stator of a generator 12 and the stator of a motor 11, shortening the coolant flow path and improving cooling efficiency. Furthermore, the opening orientation of one main oil hole 101 is opposite to the opening orientation of one of the two secondary oil holes 102a, while the opening orientation of the other secondary oil hole 102b intersects with the opening orientation of one main oil hole 101. This facilitates the machining of one main oil hole 101 and two secondary oil holes 102 from different directions of the integrated housing 100, which helps to ensure the overall structural strength of the integrated housing 100 and prevents any part of the integrated housing 100 from having lower strength, thus reducing the overall structural strength of the integrated housing 100.

[0155] In this embodiment of the application, as shown in Figures 3 and 5, the distance between a main oil hole 101 and a secondary oil hole 102a is denoted as L11, the distance between a main oil hole 101 and another secondary oil hole 102b is denoted as L12, the inner diameter of a groove 110a is denoted as L13, and the inner diameter of another groove 110b is denoted as L14, where L11 > L13, L11 > L14, L12 > L13, and L12 > L14. This arrangement facilitates the placement of a main oil hole 101 and two secondary oil holes 102a in the two grooves 11a respectively. On both sides of the groove 110, a main oil hole 101 is arranged in the middle of the side where the two grooves 110 are close to each other. This is beneficial because the machining and casting of the main oil hole 101 will not adversely affect the two grooves 110. It is also beneficial because after the coolant is introduced into an internal flow channel 140 from the main oil hole 101, it is sprayed onto the two gear sets 115 through the gear outlet hole 104, bearing outlet hole 105, and oil injector 194 (as shown in Figure 6) in a short path, thus cooling and lubricating the two gear sets 115 and the bearings. Two secondary oil holes 102 are arranged on both sides of the two grooves 110. This is beneficial because it is beneficial to arrange the pipeline of the two secondary oil holes 102. It is also beneficial because the two secondary oil holes 102 respectively transport the coolant in the internal flow channel 140 from the outside of the two grooves 110 to the two grooves 110 to cool the stator of the generator 12 and the stator of the motor 11. This is beneficial to increasing the spray and cooling area of ​​the coolant and improving the cooling effect of the dual motor powertrain 10.

[0156] In this embodiment, the distance between a main oil hole 101 and a secondary oil hole 102a is L11, and the distance between a main oil hole 101 and a stator outlet hole 113a in a groove 110a is denoted as L15. L11 > L15. A smaller L15 is advantageous for arranging a stator outlet hole 113a on the inner wall of a groove 110a to spray coolant onto the stator of a motor 11 and cool it down. A larger L11 is advantageous for arranging a secondary oil hole 102a on the outer side of a groove 110a, which is advantageous for machining a secondary oil hole 102a from the outer side of the integrated housing 100 inwards, without affecting the structural strength of the groove 110a.

[0157] In this embodiment, the distance between a main oil hole 101 and a secondary oil hole 102b is L12, and the distance between a main oil hole 101 and a stator outlet hole 113b in another groove 110b is denoted as L16. L12 > L16, which is beneficial for arranging a stator outlet hole 113b on the inner wall of another groove 110b to spray coolant onto the stator of a generator 12 and cool it down. The larger L12 is also beneficial for arranging the secondary oil hole 102b on the outer side of another groove 110b, which is beneficial for machining the secondary oil hole 102b from the outer side of the integrated housing 100 inwards, without affecting the structural strength of the other groove 110b.

[0158] Please refer to Figures 5, 11, and 12. Figure 11 is a partially enlarged view of the M3 portion in the integrated housing 100 in Figure 5, and Figure 12 is a cross-sectional view of the oil pump tank 120 provided in an embodiment of this application. In one embodiment, an oil pump tank 120 includes a coarse filter receiving section 121 and an oil pump receiving section 122.

[0159] In this embodiment, the coarse filter housing section 121 houses a coarse filter (not shown), and the oil pump housing section 122 houses an oil pump 15. A coarse filter is used to filter and remove impurities from the oil input to the oil pump 15, which helps reduce the workload of the fine filter 17. In this embodiment, the fine filter 17 has a greater filtration capacity than the coarse filter, and the particle size of the impurities filtered by the fine filter 17 is smaller than that filtered by the coarse filter.

[0160] In one embodiment, as shown in Figures 11 and 12, an oil pump tank 120 includes an oil pump tank inlet hole 123 and an oil pump tank outlet hole 124. The oil pump tank inlet hole 123 is used to connect to another internal flow channel 150 (as shown in Figure 3), and the oil pump tank outlet hole 124 is used to connect to an internal flow channel 140 (as shown in Figure 3).

[0161] In this embodiment, the oil pump tank inlet hole 123 is used to input the coolant in another internal flow channel 150 (as shown in FIG. 3) into the oil pump tank 120. After being coarsely filtered by a coarse filter in the oil pump tank 120, the coolant reaches an oil pump 15. The coolant is pumped out of the oil pump tank outlet hole 124 by the oil pump 15 and pumped into an internal flow channel 140. The internal flow channel 140 is used to cool and reduce the temperature of the stator of a generator 12 and the stator of a motor 11, and to cool and lubricate the two gear sets 115 and the bearings.

[0162] In one embodiment, as shown in Figures 11 and 12, the oil passage between the two return holes 114 of the two grooves 110 and the oil pump groove inlet hole 123 forms another internal flow channel 150 of the integrated housing 100 (as shown in Figure 3).

[0163] In one embodiment, an integrated housing 100 further includes a heat exchange inlet 103a and a heat exchange outlet 103b, as shown in Figures 11 and 12. The heat exchange inlet 103a is used to connect to the oil pump tank outlet 124, and the heat exchange outlet 103b is used to connect to an internal flow channel 140 (as shown in Figure 5).

[0164] In this embodiment, the heat exchange inlet 103a is used to input the coolant fed into the oil pump tank outlet 124 into the heat exchanger for heat exchange, thereby cooling down the heated coolant in the internal flow channel 140 transported by the other internal flow channel 150. Then, the coolant is fed into the internal flow channel 140 through the heat exchange outlet 103b, realizing the recycling of coolant. It also helps the coolant in the internal flow channel 140 to always be at a lower temperature, thereby improving the heat dissipation efficiency of the dual-motor powertrain 10 and enhancing the performance of the dual-motor powertrain 10.

[0165] In one embodiment, the integrated housing 100 further includes a fine filter tank 130, as shown in Figures 8 and 11. The fine filter tank 130 accommodates a fine filter 17 and includes a fine filter inlet 131 and a fine filter outlet 132. The fine filter inlet 131 communicates with the heat exchange outlet 103b, and the fine filter outlet 132 communicates with an internal flow channel 140. It should be noted that the fine filter 17 in Figure 11 is a schematic representation of the position of the fine filter 17.

[0166] In this embodiment, a fine filter 17 filters and removes impurities from a portion of the coolant cooled by the heat exchanger to obtain a highly clean coolant, which is then delivered to two grooves 110 for cooling the stator of a generator 12 and the stator of a motor 11.

[0167] In one embodiment, as shown in Figures 8 and 11, a portion of the coolant output from the heat exchange outlet 103b is output to the fine filter inlet 131 for filtration and impurity removal within the fine filter 17. Another portion of the coolant is directly output into an internal flow channel 140. This means that a bypass structure is added to the fine filter 17, which helps to reduce system flow resistance, improve the pumping capacity of the oil pump 15, and the filtration and impurity removal of a portion of the coolant also helps to improve the cleanliness of the oil cooling system.

[0168] Please refer to Figures 4, 6, 13 and 14. Figure 13 is a structural schematic diagram of a cover plate 200 provided in an embodiment of this application, and Figure 14 is a structural schematic diagram of another cover plate 200 provided in an embodiment of this application.

[0169] In one embodiment, an integrated housing 100 includes two mounting surfaces 170, as shown in FIG. 4. The two mounting surfaces 170 are opposite each other along the axial direction O of a generator 12 or a motor 11. Each mounting surface 170 is used to fix a cover plate 200. At least one mounting surface 170 includes two oil holes 170c, which are used to connect an internal flow channel 140 and an internal oil passage of the cover plate 200. The openings of the two oil holes 170c along the axial direction O of the motor 11 or the generator 12 face the cover plate 200.

[0170] In this embodiment, each mounting surface 170 is used for fixed connection with a cover plate 200. Each mounting surface 170 can be a flat surface or a surface with concave and convex shapes, as long as each mounting surface 170 can be fixed with a cover plate 200. For example, one mounting surface 170 of the integrated housing 100 and the mounting surface of the cover plate 200 are both flat surfaces. For example, one mounting surface 170 of the integrated housing 100 and the mounting surface of the cover plate 200 have a concave-convex fit.

[0171] In this embodiment, at least one mounting surface 170 includes two oil holes 170c. The two oil holes 170c are used to connect an internal flow channel 140 and an internal oil passage of a cover plate 200, so that the coolant in an internal flow channel 140 of an integrated housing 100 can flow into the internal oil passage of a cover plate 200, so that the internal components near the cover plate 200 can be lubricated and cooled, which is beneficial to making the cooling and lubrication pipes inside the dual-motor powertrain 10 more complete and improving the cooling and lubrication efficiency of the dual-motor powertrain 10.

[0172] In this embodiment, the internal oil passage of a cover plate 200 is die-cast within the cover plate 200, which helps to reduce the pipeline layout outside the cover plate 200, reduce the overall volume of the dual-motor powertrain 10, and also helps to save die-casting materials and reduce production costs.

[0173] In this embodiment, the openings of two oil holes 170c along the axial direction of a motor 11 or a generator 12 face a cover plate 200, thereby facilitating the smoother flow of coolant from the two oil holes 170c into the internal oil passages of the cover plate 200.

[0174] In one embodiment, an integrated housing 100 further includes a mounting surface 170a, as shown in Figures 4 and 13. The mounting surface 170a is used to fix a motor cover plate 300, which, together with two recesses 110, forms two motor receiving cavities 600. The two motor receiving cavities 600 are respectively used to accommodate the stator of a generator 12 and the stator of a motor 11. The mounting surface 170a includes two first oil holes 171, each of which is used to connect a stator outlet hole 113 and to connect an internal oil passage of the motor cover plate 300. The openings of the two first oil holes 171 face the motor cover plate 300 along the axial direction of either the motor 11 or the generator 12.

[0175] In this embodiment, a mounting surface 170a is used to mount and fix the motor cover plate 300, which facilitates the formation of two motor receiving cavities 600 by the motor cover plate 300 and the two grooves 110. The two motor receiving cavities 600 are respectively used to accommodate the stator of a generator 12 and the stator of a motor 11, so that the stator of a generator 12 and the stator of a motor 11 are not affected by the external environment. It also helps that the coolant flowing into the two grooves 110 from the two stator outlet holes 113 will not flow out of the two motor receiving cavities 600 from the part other than the return hole 114 (as shown in Figure 5), causing coolant leakage.

[0176] In this embodiment, a mounting surface 170a includes two first oil holes 171. Each first oil hole 171 connects to a stator outlet hole 113 and to an internal oil passage of the motor cover plate 300, thereby allowing coolant flowing from a stator outlet hole 113 into a groove 110 and from each first oil hole 171 into the internal oil passage of the motor cover plate 300 to be connected in parallel. It also facilitates the input of coolant from an internal flow channel 140 into the internal oil passage of the motor cover plate 300 through the two first oil holes 171, enabling lubrication and cooling of internal components near the motor cover plate 300. This results in a more complete cooling and lubrication system within the dual-motor powertrain 10, improving the cooling and lubrication efficiency of the dual-motor powertrain 10.

[0177] In this embodiment, the openings of the two first oil holes 171 along the axial direction of a motor 11 or a generator 12 face the motor cover plate 300, which facilitates the smoother flow of coolant in the two first oil holes 171 into the internal oil passages of the motor cover plate 300.

[0178] In one embodiment, the motor cover 300 includes a motor cover mounting surface 310, as shown in Figures 4 and 13. The motor cover mounting surface 310 is used to fix a mounting surface 170a. The motor cover mounting surface 310 includes two motor oil holes 301, which are respectively used to connect to two first oil holes 171 and to connect to the internal oil passages of the motor cover 300. The openings of the two motor oil holes 301 along the axial direction of a motor 11 or a generator 12 face an integrated housing 100. The two motor oil holes 301 are aligned with the two first oil holes 171 along the axial direction of a motor 11 or a generator 12.

[0179] In this embodiment, a motor cover mounting surface 310 is fixedly connected to a mounting surface 170a. The motor cover mounting surface 310 and the mounting surface 170a can be planar or have a concave-convex surface, as long as the motor cover mounting surface 310 can be fixed to the mounting surface 170a. For example, both the motor cover mounting surface 310 and the mounting surface 170a are planar. For example, the motor cover mounting surface 310 and the mounting surface 170a have a concave-convex fit.

[0180] In this embodiment, a motor cover mounting surface 310 includes two motor oil holes 301. The two motor oil holes 301 are respectively used to connect two first oil holes 171 and to connect the internal oil passage of the motor cover 300. The two motor oil holes 301 facilitate the flow of coolant in an internal flow channel 140 of the integrated housing 100 from the two first oil holes 171 and the two motor oil holes 301 into the internal oil passage of the motor cover 300.

[0181] In this embodiment, the openings of the two motor oil holes 301 along the axial direction of a motor 11 or a generator 12 face an integrated housing 100, which facilitates the two motor oil holes 301 receiving coolant more smoothly from the two first oil holes 171 of the integrated housing 100.

[0182] In this embodiment, along the axial direction of a motor 11 or a generator 12, two motor oil holes 301 are aligned with two first oil holes 171, which facilitates the flow of coolant from an internal flow channel 140 into the internal oil passage of the motor cover plate 300 through the two first oil holes 171 with a shorter path and faster speed.

[0183] In one embodiment, the two first oil holes 171 and the two motor oil holes 301 are sealed by a sealing ring to prevent oil leakage.

[0184] In one embodiment, a mounting surface 170a includes a plurality of fixing holes 302, as shown in Figures 4 and 13, for fixing a motor cover plate 300. The fixing holes 302 surround the outer periphery of two recesses 110 along radial directions R1 and R2 of a motor 11 or a generator 12. A first oil hole 171a communicates with one recess 110a, and along radial direction R1 of a motor 11, the first oil hole 171a is arranged between the recess 110a and the plurality of fixing holes 302.

[0185] In this embodiment, a mounting surface 170a includes multiple fixing holes 302, which facilitates fixing the mounting surface 170a to the motor cover plate 300 using screws through the multiple fixing holes 302. Along the radial directions R1 and R2 of a motor 11 or a generator 12, the multiple fixing holes 302 of the motor cover plate 300 surround the outer periphery of two grooves 110, which facilitates the use of multiple screws passing through the multiple fixing holes 302 to fix the mounting surface 170a and the motor cover plate mounting surface 310 from the outer periphery of the two grooves 110. This means that multiple fixing connections are made around the integrated housing 100 and the motor cover plate 300, resulting in a more reliable and stable fixation.

[0186] In this embodiment, a first oil hole 171a is used to connect to a groove 110a, thereby facilitating the parallel connection of the coolant flowing from an internal flow channel 140 into the groove 110a to supply coolant for the stator cooling of a motor 11 and the coolant flowing into the internal oil passage of the motor cover plate 300. This helps to reduce flow resistance and improve cooling efficiency. Along the radial direction R1 of a motor 11, a first oil hole 171a is arranged between a groove 110a and multiple fixing holes 302. This means that the pipe connected to the first oil hole 171a can be arranged inside the integrated housing 100. This helps to fully utilize the space inside the integrated housing 100 without excessively occupying the space outside the integrated housing 100, thus reducing the overall volume of the dual-motor powertrain 10 and facilitating its miniaturized arrangement.

[0187] In one embodiment, an integrated housing 100 further includes another mounting surface 170b, as shown in Figures 3, 6, and 14. This mounting surface 170b is used to fix one end face 410 of a reducer cover 400, and the other end face 420 of the reducer cover 400 is used to fix an engine 16 (as shown in Figure 2). The engine 16 is used to drive a generator 12 via a gear set 115a. As shown in Figure 6, the other mounting surface 170b includes two second oil holes 172, each second oil hole 172 connecting to an internal flow channel 140 and an internal oil passage of the reducer cover 400. The openings of the two second oil holes 172 are oriented away from the two recesses 110 along the axial direction of either the motor 11 or the generator 12.

[0188] In this embodiment, another mounting surface 170b is used to fix one end face 410 of the reducer cover plate 400, which facilitates the other mounting surface 170b of the integrated housing 100 to form a reducer receiving cavity 500 with the reducer cover plate 400. The reducer receiving cavity 500 is used to accommodate two gear sets 115.

[0189] In this embodiment of the application, another mounting surface 170b includes two second oil holes 172, each second oil hole 172 for connecting an internal flow channel 140 and an internal oil passage for connecting the reducer cover plate 400, thereby facilitating the flow of coolant in an internal flow channel 140 from the two second oil holes 172 out of an integrated housing 100 and into the internal oil passage of the reducer cover plate 400.

[0190] In this embodiment, the openings of the two second oil holes 172 along the axial direction of a motor 11 or a generator 12 are directed away from the two grooves 110, that is, along the axial direction of a motor 11 or a generator 12, the openings of the two second oil holes 172 are directed towards the reducer cover plate 400, which facilitates the smoother flow of coolant in the two second oil holes 172 into the internal oil passage of the reducer cover plate 400.

[0191] In one embodiment, the reducer cover 400 includes a reducer cover mounting surface 470, as shown in Figures 3, 6, and 14. The reducer cover mounting surface 470 is used to fix another mounting surface 170b. The reducer cover mounting surface 470 includes two reducer oil holes 401, which are respectively used to connect two second oil holes 172 and to connect to the internal oil passages of the reducer cover 400. Along the axial direction of a motor 11 or a generator 12, the openings of the two reducer oil holes 401 face an integrated housing 100. Along the axial direction of a motor 11 or a generator 12, one reducer oil hole 401a is aligned with one second oil hole 172a, and the other reducer oil hole 401b is offset from the other second oil hole 172b.

[0192] In this embodiment, a reducer cover mounting surface 470 is used to fix another mounting surface 170b. The reducer cover mounting surface 470 and the other mounting surface 170b can be planar or have a concave-convex surface, as long as it ensures that the reducer cover mounting surface 470 can be fixed to the other mounting surface 170b. For example, both the reducer cover mounting surface 470 and the other mounting surface 170b are planar. For example, the reducer cover mounting surface 470 and the other mounting surface 170b have a concave-convex fit.

[0193] In this embodiment, a reducer cover mounting surface 470 includes two reducer oil holes 401. The two reducer oil holes 401 are respectively used to connect two second oil holes 172 and to connect the internal oil passage of the reducer cover 400. The two reducer oil holes 401 facilitate the flow of coolant in an internal flow channel 140 of the integrated housing 100 from the two second oil holes 172 and the two reducer oil holes 401 into the internal oil passage of the reducer cover 400.

[0194] In this embodiment, along the axial direction of a motor 11 or a generator 12, a reducer oil hole 401a is aligned with a second oil hole 172a. This allows the second oil hole 172a to allow coolant from an internal flow channel 140 to flow into the internal oil passage of the reducer cover plate 400 via a shorter path and at a faster speed. Another reducer oil hole 401b is offset from the other second oil hole 172b, allowing the second second oil hole 172b to be arranged on a secondary oil passage 142. Furthermore, the second second oil hole 172b can be arranged closer to a drive shaft cavity 181a, which facilitates the lubrication and cooling of the bearings in the drive shaft cavity 181a by the coolant flowing from the internal flow channel 140.

[0195] In one embodiment, the two second oil holes 172 and the two reducer oil holes 401 are sealed by a sealing ring to prevent oil leakage.

[0196] In one embodiment, another mounting surface 170b and a reducer cover mounting surface 470 together form a reducer guide channel 430, as shown in Figures 6 and 14. Coolant in an internal flow channel 140 flows through another second oil hole 172b on another mounting surface 170b, through a reducer guide channel 430, into another reducer oil hole 401b on a reducer cover mounting surface 470, and then into the internal oil passage of the reducer cover 400, as shown in Figure 3, to cool and lubricate the bearings in a drive shaft cavity 181a, an intermediate shaft cavity 182a, and an output shaft cavity 183.

[0197] In this embodiment, along the axial direction O of a motor 11 or a generator 12, another reducer oil hole 401b is offset from another second oil hole 172b. The coolant in the other second oil hole 172b flows into the other reducer oil hole 401b, which requires a reducer guide channel 430 for connection. This facilitates the smooth flow of coolant in an internal flow channel 140 from the other second oil hole 172b and into the internal flow channel of the reducer cover plate 400 from the other reducer oil hole 401b.

[0198] In one embodiment, as shown in Figures 6 and 14, the reducer cover 400 includes two drive shaft bearing grooves 440, which are used to fix the outer rings of bearings of two drive shafts 191, respectively. The two drive shafts 191 are used to drive the rotor of a generator 12 and the rotor of a motor 11, respectively. Each drive shaft bearing groove 440 has a drive shaft oil hole 406 at its bottom, which connects to a reducer oil hole 401 via an internal oil passage in the reducer cover 400. Along the axial direction of the motor 11 or the generator 12, the opening of each drive shaft oil hole 406 faces an integrated housing 100, and each drive shaft oil hole 406 connects to a groove 110 via a drive shaft 191.

[0199] In this embodiment of the application, the bottom of each drive shaft bearing groove 440 includes a drive shaft oil hole 406. Each drive shaft oil hole 406 is used to connect a reducer oil hole 401 through the internal oil passage of the reducer cover plate 400. A drive shaft oil hole 406 can sequentially connect the inner cavity of the drive shaft 191 and the motor shaft, and deliver coolant to the two grooves 110 or the rotor of a generator 12 or the rotor of a motor 11 for cooling.

[0200] In this embodiment, the opening of each drive shaft oil hole 406 along the axial direction O of one motor 11 or one generator 12 faces an integrated housing 100, and the bearing arrangement fluid of each drive shaft 191 faces an integrated housing 100. This facilitates the spraying of coolant from each drive shaft oil hole 406 towards the integrated housing 100, thereby improving the cooling and lubrication of the bearings of the two drive shafts 191. Each drive shaft oil hole 406 is used to connect a drive shaft 191 to a groove 110, so that the bearing of one drive shaft 191 can receive cooling and lubrication not only from one drive shaft oil hole 406, but also from the coolant flowing into the groove 110 through a stator outlet hole 113. This improves the cooling and lubrication efficiency of the bearings and enhances the performance of the dual-motor powertrain 10.

[0201] In one embodiment, the peripheral wall of each drive shaft bearing groove 440 includes a bearing groove inlet hole 403. Each bearing groove inlet hole 403 is used to connect to a reducer oil hole 401 through the internal oil passage of the reducer cover plate 400. The coolant flows sequentially through an internal flow channel 140, a second oil hole 172a, a reducer oil hole 401a, and a bearing groove inlet hole 403a, and flows into a drive shaft bearing groove 440a to cool and lubricate the bearing of another drive shaft 191b. The coolant also flows sequentially through an internal flow channel 140, another second oil hole 172b, another reducer oil hole 401b, and another bearing groove inlet hole 403b, and flows into another drive shaft bearing groove 440b to cool and lubricate the bearing of a drive shaft 191a.

[0202] In one embodiment, as shown in Figures 6 and 14, the reducer cover plate 400 further includes two intermediate shaft bearing grooves 450 and two first bearing groove connecting holes 404. The two intermediate shaft bearing grooves 450 are used to fix the outer rings of the bearings of the two intermediate shafts 192, respectively, and the two first bearing groove connecting holes 404 are used to connect the two transmission shaft bearing grooves 440 and the two intermediate shaft bearing grooves 450, respectively.

[0203] In this embodiment, the two first bearing groove connecting holes 404 allow coolant flowing from the two drive shaft oil holes 406 into the two drive shaft bearing grooves 440 to flow out into the two intermediate shaft bearing grooves 450, providing cooling and lubrication for the bearings of the two intermediate shafts 192. This improves the cooling and lubrication efficiency of the dual-motor powertrain 10. The interconnected holes in the intermediate shaft bearing grooves 450 and drive shaft bearing grooves 440 facilitate coolant recycling and reduce coolant demand.

[0204] In one embodiment, as shown in Figures 6 and 14, the cover plate 400 further includes an output shaft bearing groove 460 and a second bearing groove connecting hole 405. The output shaft bearing groove 460 is used to fix the outer ring of the bearing of an output shaft 184 (as shown in Figure 7), and the second bearing groove connecting hole 405 is used to connect the output shaft bearing groove 460 and an intermediate shaft bearing groove 450a. This allows coolant flowing in from a drive shaft oil hole 406b to flow sequentially from a drive shaft bearing groove 440b, a first bearing groove connecting hole 404a, an intermediate shaft bearing groove 450a, and a second bearing groove connecting hole 405a into the output shaft bearing groove 460, providing cooling and lubrication for the bearing of the output shaft 184, thereby improving the cooling and lubrication efficiency of the dual-motor powertrain 10. The perforated connection between the intermediate shaft bearing groove 450 and the output shaft bearing groove 460 facilitates coolant recycling and reduces coolant demand.

[0205] The above provides a detailed description of the dual-motor powertrain and vehicle with integrated flow channel housing provided in the embodiments of this application. Specific examples have been used to illustrate the principles and embodiments of this application. The description of the above embodiments 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 dual-motor powertrain with an integrated flow channel in the housing, characterized in that, The dual-motor powertrain includes an electric motor, a generator, and a one-piece die-cast integrated housing, wherein the integrated housing includes: An internal flow channel for conveying coolant; Two grooves, one groove for fixing the stator of the electric motor and the other groove for fixing the stator of the generator, each groove having an inner wall including a stator outlet hole for connecting to an internal flow channel to receive coolant.

2. The dual-motor powertrain according to claim 1, characterized in that, Each of the grooves includes an axial groove bottom and a circumferential groove wall, wherein: Along the radial direction of the motor, one of the stator outlet holes penetrates the circumferential wall of the groove. Along the radial direction of one of the generators, another of the stator outlet holes penetrates the circumferential groove wall of the other groove.

3. The dual-motor powertrain according to claim 1, characterized in that, The distance between the two stator liquid outlet holes is greater than the distance between the two grooves.

4. The dual-motor powertrain according to any one of claims 1-3, characterized in that, The dual-motor powertrain includes two gear sets, one motor driving one gear set and one generator driving the other gear set. The integrated housing includes two sides facing away from each other along the axial direction of either the motor or the generator. One of the side surfaces includes the two grooves, which are spaced apart along the radial direction of the electric motor or the generator; Another side is used to accommodate multiple gears of the two gear sets, and the other side includes one or more gear outlet holes, each gear outlet hole being used to connect to an internal flow channel to receive coolant.

5. The dual-motor powertrain according to claim 4, characterized in that, The dual-motor powertrain includes two drive shafts, and the integrated housing includes two drive shaft cavities. The two drive shaft cavities respectively penetrate the integrated housing along the axial direction of the motor or the generator, wherein: One of the drive shaft cavities is used to fix the outer ring of a bearing of the drive shaft, the drive shaft being used to drive a gear in the gear set and the rotor of the electric motor; Another drive shaft cavity is used to fix the outer ring of the bearing of another drive shaft, which is used to drive a gear in another gear set and the rotor of a generator. The inner peripheral wall of each of the drive shaft cavities includes a bearing coolant outlet hole, and the bearing coolant outlet holes of the two drive shaft cavities are respectively used to connect to an internal flow channel to receive coolant.

6. The dual-motor powertrain according to claim 5, characterized in that, Along the arrangement direction of the two drive shaft cavities, the opening of the bearing outlet hole on the inner peripheral wall of one drive shaft cavity faces away from the other drive shaft cavity; The distance between the two drive shaft cavities is less than the distance between the bearing outlet holes of the two drive shaft cavities.

7. The dual-motor powertrain according to claim 5, characterized in that, One of the gear outlet holes is used to fix a fuel injector, and the distance between the gear outlet hole and each of the drive shaft cavities is less than the distance between the two drive shaft cavities; The diameter of one gear's liquid outlet hole is larger than the diameter of the other gear's liquid outlet holes.

8. The dual-motor powertrain according to claim 5, characterized in that, The dual-motor powertrain includes two intermediate shafts, and the integrated housing includes two intermediate shaft cavities. The two intermediate shaft cavities respectively penetrate the integrated housing along the axial direction of the motor or the generator, wherein: One of the intermediate shaft cavities is used to fix the outer ring of a bearing of the intermediate shaft, and the intermediate shaft is used to drive a connection between the drive shaft and a large disc gear; Another intermediate shaft cavity is used to fix the outer ring of the bearing of another intermediate shaft, which is used to drive the other drive shaft and an engine shaft; The other side also includes two oil guide ribs, each of which is connected to the outer peripheral wall of one of the intermediate shaft cavities. The inner peripheral wall of each intermediate shaft cavity includes an opening, one of which is adjacent to one of the oil guide ribs. One of the oil guide ribs is used to guide coolant through the opening into the intermediate shaft cavity connected to it.

9. The dual-motor powertrain according to claim 8, characterized in that, Along the arrangement direction of the two intermediate shaft cavities, the two oil guide ribs are arranged between the two intermediate shaft cavities; The distance between the two openings in the two intermediate shaft cavities is less than the distance between the axes of the two intermediate shaft cavities.

10. The dual-motor powertrain according to any one of claims 1-9, characterized in that, The integrated housing also includes another internal flow channel and an oil pump tank, wherein: The other internal flow channel is used to connect to the oil pump tank, the oil pump tank is used to house an oil pump, and the oil pump is used to receive coolant through the other internal flow channel and to output coolant through the other internal flow channel.

11. The dual-motor powertrain according to claim 10, characterized in that, The inner wall of each of the grooves also includes a return hole, and the two return holes of the two grooves are used to respectively supply coolant to the other internal flow channel, wherein: Along the radial direction of the generator or the motor, the distance between the two return fluid holes is greater than the distance between the stator of the motor and the stator of the generator.

12. The dual-motor powertrain according to any one of claims 1-11, characterized in that, The integrated housing further includes a main oil port and two secondary oil ports. The main oil port is used to connect the two secondary oil ports through an internal flow channel. The opening of the main oil port and the opening of each of the secondary oil ports are used to accommodate a sealing component. Along the radial direction of the generator or the motor, the main oil hole and the two secondary oil holes are respectively arranged on both sides of the two grooves.

13. The dual-motor powertrain according to claim 12, characterized in that, The opening orientation of the main oil hole is opposite to the opening orientation of one of the two secondary oil holes, and the opening orientation of the other of the two secondary oil holes intersects with the opening orientation of the main oil hole. The distance between the main oil hole and either of the two secondary oil holes is greater than the inner diameter of each groove; The distance between the main oil hole and the secondary oil hole is greater than the distance between the main oil hole and the stator outlet hole of the groove; The distance between the main oil hole and the secondary oil hole is greater than the distance between the main oil hole and a stator outlet hole in the other groove.

14. The dual-motor powertrain according to any one of claims 1-13, characterized in that, The integrated housing includes two mounting surfaces opposite each other along the axial direction of the generator or the motor. Each mounting surface is used to fix a cover plate. At least one mounting surface includes two oil holes for communicating with an internal oil passage and an internal oil passage of the cover plate, wherein: The openings of the two oil holes are oriented toward the cover plate along the axial direction of the electric motor or the generator.

15. A vehicle, characterized in that, The vehicle includes a frame and a dual-motor powertrain as described in any one of claims 1-14, the frame being used to secure the dual-motor powertrain, one motor in the dual-motor powertrain being connected to a wheel via a gear set in the dual-motor powertrain, and one generator in the dual-motor powertrain being connected to an engine via another gear set in the dual-motor powertrain.

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