CN118523518A

CN118523518A - Dual-motor powertrain and vehicle with integrated flow channel in housing

Info

Publication number: CN118523518A
Application number: CN202410488488.0A
Authority: CN
Inventors: 王齐; 汪思学; 朱婷; 卫镜周; 李帅
Original assignee: Huawei Digital Power Technologies Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2024-04-22
Filing date: 2024-04-22
Publication date: 2024-08-20
Also published as: WO2025223161A1

Abstract

The present application provides a dual-motor powertrain and vehicle with integrated flow channels in the shell. The dual-motor powertrain includes an electric motor, a generator and an integrated die-cast shell. An integrated shell includes an internal flow channel, and an internal flow channel is used to transmit coolant. Two grooves, one groove is used to fix the stator of an electric motor, and the other groove is used to fix the stator of a generator. The inner groove wall of each groove includes a stator liquid outlet, and each stator liquid outlet is used to connect to an internal flow channel to receive coolant. By integrating the internal flow channel in the integrated shell, the external pipeline layout is reduced, the space occupation is reduced, the integration is improved, and the miniaturized layout is facilitated. It can also save die-casting materials and reduce costs. The coolant cools the stator of the generator and the stator of the electric motor in parallel, which can reduce the system flow resistance, reduce power loss, and improve cooling efficiency.

Description

Dual-motor power assembly with integrated flow channel of shell and vehicle

Technical Field

The application relates to the technical field of electric vehicles, in particular to a double-motor power assembly with a shell integrated with a runner and a vehicle.

Background

The characteristics of energy saving, low emission and the like of the hybrid power vehicle gradually become the main stream of the market. However, in the hybrid vehicle, the powertrain includes the generator and the motor, and the cooling system design of the generator and the motor still has problems of low cooling efficiency, high energy consumption, and the like. Therefore, the design of the high-efficiency hybrid oil cooling system has important significance for improving the automobile performance, reducing the energy consumption and improving the user experience, however, when the conventional hybrid oil cooling system mainly has a cooling pipeline arranged outside a power assembly shell, the problems of higher pipeline component cost, larger whole size of the power assembly, poor whole reliability of the power assembly and the like exist.

Disclosure of Invention

The application provides a double-motor power assembly with a shell integrated with a runner and a vehicle.

In a first aspect, embodiments of the present application provide a dual motor powertrain having a housing integrated runner, the dual motor powertrain including a motor, a generator, and an integrated housing integrally die-cast, the integrated housing including an internal runner and two grooves, the internal runner for transmitting a coolant. One groove is used for fixing a stator of an electric motor, the other groove is used for fixing a stator of an electric generator, the inner groove wall of each groove comprises a stator liquid outlet hole, and each stator liquid outlet hole is used for communicating an inner runner to receive cooling liquid.

In an embodiment of the application, an integrated housing is used to house an electric motor and an electric generator. An integrated shell is formed by integral die casting, the processing technology is simple and convenient, and the structural stability of the double-motor power assembly and the integration level of the double-motor power assembly are improved.

In the embodiment of the application, one integrated shell comprises one inner runner, and one inner runner is integrated in one integrated shell, so that the arrangement of external pipelines is reduced, the integration level of one integrated shell is improved, the occupation of one inner runner to the space outside one integrated shell is reduced, the miniaturized layout of the double-motor power assembly is realized, the die-casting material of one integrated shell is saved, and the cost is reduced. An inside runner is used for transmitting the coolant, and an inside runner is used for circulating the coolant and carries out cooling to a motor and a generator inside an integrated casing, avoids a generator and a motor to produce overheated problem, ensures that a generator and a motor work normally.

In the embodiment of the application, one integrated shell comprises two grooves, one groove is used for fixing the stator of one motor, the other groove is used for fixing the stator of one generator, and the inner groove wall of each groove comprises a stator liquid outlet hole, so that cooling liquid in one inner flow passage can flow into the two grooves to cool the stator of one motor and the stator of one generator. Each stator liquid outlet hole is used for being communicated with one internal flow channel to receive cooling liquid, so that the cooling liquid in one internal flow channel flows into the stator liquid outlet holes of the two grooves respectively, the cooling mode that the cooling liquid in one internal flow channel cools down the stator of one generator and the stator of one motor into parallel flow channels is realized, and one internal flow channel cools down the stator of one motor and the stator of one generator simultaneously, thereby being beneficial to improving the cooling efficiency of the double-motor power assembly. Compared with the method that a serial runner is used for sequentially realizing cooling of a stator of a generator and a stator of a motor, the parallel connection of the cooling runners is also beneficial to reducing the flow resistance of the system, reducing the power loss, improving the oil pumping capacity of an oil pump and improving the cooling efficiency of a double-motor power assembly.

In one embodiment, each groove includes an axial groove bottom and a circumferential groove wall. Wherein, along the radial direction of a motor, a stator liquid outlet hole penetrates through the circumferential groove wall of a groove. Along the radial direction of one generator, the other stator liquid outlet hole penetrates through the circumferential groove wall of the other groove.

In an embodiment of the application, each groove comprises an axial groove bottom and a circumferential groove wall, the circumferential groove wall of one groove is used for fixing a stator of one motor, and the circumferential groove wall of the other groove is used for fixing a stator of one generator.

In the embodiment of the application, the stator liquid outlet holes penetrate through the circumferential groove wall of the groove along the radial direction of the motor, so that the cooling liquid input from the stator liquid outlet holes can be sprayed on the outer peripheral surface of the stator of the motor, the spraying area of the cooling liquid is enlarged, the cooling area of the cooling liquid on the stator of the motor is enlarged, and the cooling efficiency of the motor is improved. If a stator liquid outlet hole penetrates through the axial groove bottom of a groove, more cooling liquid is sprayed on the end face of the stator of the motor, the cooling effect on the stator of the motor is poor, and the improvement of cooling efficiency is not facilitated.

In the embodiment of the application, the other stator liquid outlet holes penetrate through the circumferential groove wall of the other groove along the radial direction of one generator, so that the cooling liquid input from the other stator liquid outlet holes can be sprayed to the outer circumferential surface of the stator of one generator, the spraying area of the cooling liquid is enlarged, the cooling area of the cooling liquid to the stator of one generator is enlarged, and the cooling efficiency of one generator is improved. If the other stator liquid outlet hole penetrates through the axial groove bottom of the other groove, more cooling liquid is sprayed on the end face of the stator of one generator, the cooling effect on the stator of one generator is poor, and the improvement of cooling efficiency is not facilitated.

In one embodiment, the spacing between the two stator outlet holes is greater than the spacing between the two grooves.

In the embodiment of the application, the distance between the two stator liquid outlet holes is larger than the distance between the two grooves, the distance between the two stator liquid outlet holes is larger, the two stator liquid outlet holes are arranged at the high positions of the two grooves, the cooling liquid is favorably sprayed to the stator of one generator and the stator of one motor along the gravity action direction, the stator of one generator and the stator of one motor are cooled, the power loss is favorably reduced, the area of the cooling liquid in the two stator liquid outlet holes sprayed to the stator of one generator and the area of the stator of one motor are also favorably increased, and the cooling efficiency of one generator and one motor is improved.

In one embodiment, the dual motor powertrain includes two gear sets, one motor for drivingly connecting one gear set and one generator for drivingly connecting the other gear set, and an integrated housing includes two sides, opposite sides along an axis of one motor or one generator. Wherein one side surface comprises two grooves which are arranged at intervals along the radial direction of one motor or one generator. The other side is for receiving a plurality of gears of the two gear sets, and the other side includes one or more gear outlet holes, each for communicating with an internal flow passage for receiving a cooling fluid.

In the embodiment of the application, one motor is used for being in transmission connection with one gear set, one gear set is used for being in transmission connection with one motor and wheels, one gear set receives mechanical energy of one motor, and the mechanical energy is transmitted to the wheels after being decelerated by one gear set to drive the wheels to rotate. One generator is used for being in transmission connection with the other gear set, the other gear set is used for being in transmission connection with the one generator and the one engine, and the one generator receives mechanical energy transmitted by the one engine through the other gear set and is used for driving the one generator to work.

In the embodiment of the application, one integrated housing comprises two side surfaces, and the two side surfaces are opposite to each other along the axial direction of one motor or one generator, so that two gear sets, one generator and one motor can be respectively arranged on the two side surfaces, and the arrangement is regular.

In the embodiment of the application, one side surface comprises two grooves which are arranged at intervals along the radial direction of one motor or one generator, one groove is used for fixing the stator of one motor, and the other groove is used for fixing the stator of one generator, so that the stator of one motor and the stator of one generator are arranged at intervals along the radial direction of one motor or one generator, and the two grooves are beneficial to ensuring that one motor and one generator work relatively independently. In addition, the two grooves are arranged on one side face, so that the space occupation of one generator and one motor along the axial direction of the double-motor power assembly is reduced, the whole volume of the double-motor power assembly is reduced, and the miniaturized arrangement of the double-motor power assembly is facilitated.

In the embodiment of the application, the other side surface is used for accommodating a plurality of gears of two gear sets, and the gears of the two gear sets, a generator and an engine are arranged opposite to each other along the double-motor power assembly, so that the arrangement of the double-motor power assembly is orderly. The other side comprises one or more gear liquid outlet holes, each gear liquid outlet hole is used for communicating one internal flow channel to receive cooling liquid, so that each gear liquid outlet hole can receive the cooling liquid from one internal flow channel, lubrication and cooling are carried out on a plurality of gears of two gear sets, normal operation of the double-motor power assembly is guaranteed, and cooling efficiency of the double-motor power assembly is improved.

In one embodiment, the dual motor powertrain includes two drive shafts, and an integrated housing includes two drive shaft cavities extending through one of the integrated housings along an axial direction of one of the motors or one of the generators, respectively. Wherein, a transmission shaft chamber is used for fixing the outer race of the bearing of a transmission shaft, and a transmission shaft is used for driving the rotor of a gear and a motor of connecting a gear train. The other transmission shaft cavity is used for fixing the outer ring of the bearing of the other transmission shaft, and the other transmission shaft is used for connecting one gear in the other gear set and the rotor of one generator in a transmission way. The inner peripheral wall of each transmission shaft cavity comprises a bearing liquid outlet hole, and the bearing liquid outlet holes of the two transmission shaft cavities are respectively used for communicating an inner runner to receive cooling liquid.

In the embodiment of the application, the double-motor power assembly comprises two transmission shafts, one integrated shell comprises two transmission shaft cavities, the two transmission shaft cavities penetrate through one integrated shell along the axial direction of one motor or one generator respectively, and the two transmission shaft cavities are respectively used for accommodating one of the two transmission shafts, so that the transmission connection of one motor and one transmission shaft is facilitated, and the transmission connection of one generator and the other transmission shaft is also facilitated.

In the embodiment of the application, one transmission shaft cavity is used for fixing the outer ring of the bearing of one transmission shaft, one transmission shaft is used for connecting one gear in one gear set and the rotor of one motor in a transmission manner, namely, one transmission shaft can be used for connecting one motor with one gear set in a transmission manner, so that one gear in one gear set is beneficial to receiving kinetic energy transmitted by the rotor of one motor, and the kinetic energy is decelerated through other gears in one gear set, and finally the kinetic energy is transmitted to wheels to drive the vehicle to run.

In the embodiment of the application, the other transmission shaft cavity is used for fixing the outer ring of the bearing of the other transmission shaft, the other transmission shaft is used for transmitting and connecting one gear in the other gear set and the rotor of one generator, namely the other transmission shaft can be used for transmitting and connecting one generator and the other gear set, so that one gear in the other gear set is beneficial to receiving kinetic energy from one engine and transmitting the kinetic energy to one generator, driving the one generator to convert the kinetic energy into electric energy and charging a power battery.

In the embodiment of the application, the inner peripheral wall of each transmission shaft cavity comprises a bearing liquid outlet hole, the bearing liquid outlet holes of the two transmission shaft cavities are respectively used for communicating an internal runner to receive cooling liquid, so that the cooling liquid in the internal runner can cool and lubricate the bearing of one transmission shaft and the bearing of the other transmission shaft respectively from the bearing liquid outlet holes of the two transmission shaft cavities, the friction resistance of the transmission connection of one gear in one gear set and the rotor of one motor is reduced, the friction resistance of the transmission connection of one gear in the other gear set and the rotor of one generator is reduced, the transmission process is smoother, the power loss of the double-motor power assembly is reduced, and the working performance of the double-motor power assembly is improved.

In one embodiment, along the arrangement direction of the two transmission shaft cavities, the opening of the bearing liquid outlet hole of the inner peripheral wall of one transmission shaft cavity faces away from the other transmission shaft cavity. The distance between the two transmission shaft cavities is smaller than the distance between the bearing liquid outlet holes of the two transmission shaft cavities.

In the embodiment of the application, along the arrangement direction of the two transmission shaft cavities, the opening of the bearing liquid outlet hole of the inner peripheral wall of one transmission shaft cavity faces away from the other transmission shaft cavity, and the bearing liquid outlet holes of the two transmission shaft cavities are respectively used for communicating one internal runner to receive cooling liquid, so that the arrangement of one internal runner between the two bearing liquid outlet holes is facilitated, the cooling liquid in one internal runner is facilitated to respectively convey the cooling liquid to the two bearing liquid outlet holes in a shorter path, the bearing of one transmission shaft and the bearing of the other transmission shaft are cooled and lubricated, and the cooling efficiency of the double-motor power assembly is improved.

In the embodiment of the application, the distance between the two transmission shaft cavities is smaller than the distance between the bearing liquid outlet holes of the two transmission shaft cavities, namely, one bearing liquid outlet hole of one transmission shaft cavity can be closer to the inside of one transmission shaft cavity, which is beneficial to the bearing liquid outlet hole to be closer to the bearing of one transmission shaft, and is beneficial to the cooling liquid of one bearing liquid outlet hole for receiving one internal flow channel to be sprayed on the bearing of one transmission shaft completely, so as to cool and lubricate the bearing of one transmission shaft. The other bearing liquid outlet hole of the other transmission shaft cavity can be closer to the inside of the other transmission shaft cavity, so that the other bearing liquid outlet hole is beneficial to being closer to the bearing of the other transmission shaft, and the other bearing liquid outlet hole is beneficial to receiving cooling liquid of an inner runner to be sprayed on the bearing of the other transmission shaft completely, so that the bearing of the other transmission shaft is cooled and lubricated. In the embodiment of the application, the opening of the liquid outlet hole of the other bearing faces downwards along the gravity direction, so that the liquid outlet of the liquid outlet hole of the other bearing is smoother, and the cooling and lubrication of the bearing of the other transmission shaft are realized.

In one embodiment, a gear outlet is used to fix a fuel injector, and the distance between the gear outlet and each drive shaft cavity is smaller than the distance between two drive shaft cavities. The aperture of the liquid outlet hole of one gear is larger than that of the liquid outlet holes of other gears.

In the embodiment of the application, one gear liquid outlet hole is used for fixing one oil nozzle, and one oil nozzle is used for receiving cooling liquid in one internal flow channel and spraying the cooling liquid to a plurality of gears of two gear sets for cooling and lubricating, thereby being beneficial to reducing friction resistance between the gears and reducing power loss.

In the embodiment of the application, the distance between the liquid outlet hole of one gear and each transmission shaft cavity is smaller than the distance between the two transmission shaft cavities, and the oil nozzle is arranged between the two transmission shaft cavities, so that the oil nozzle is favorably arranged between the two gear sets, and the cooling liquid in the oil nozzle can simultaneously cool and lubricate the gears in the gear sets in a shorter path, thereby being favorable for improving the cooling and lubricating efficiency. The oil nozzle is beneficial to avoiding the gear arrangement of the two gear sets, and the normal rotation of a plurality of gears in the two gear sets is not influenced, so that the arrangement of the two gear sets and the oil nozzle is more regular and reasonable.

In the embodiment of the application, the aperture of the liquid outlet hole of one gear is larger than that of the liquid outlet holes of other gears, so that more cooling liquid can flow in one oil nozzle, the oil nozzle is beneficial to spraying more cooling liquid to a plurality of gears of one gear set, the gears of one gear set are cooled and lubricated, and the cooling efficiency of the double-motor power assembly is improved.

In one embodiment, the dual motor powertrain includes two intermediate shafts, and an integrated housing includes two intermediate shaft cavities extending through one of the integrated housings along an axial direction of one of the electric motors or one of the electric generators, respectively. Wherein, a jackshaft chamber is used for fixing the outer lane of the bearing of jackshaft, and a jackshaft is used for the transmission to connect a transmission shaft and a big dish gear. The other intermediate shaft cavity is used for fixing the outer ring of the bearing of the other intermediate shaft, and the other intermediate shaft is used for connecting the other transmission shaft and the engine shaft in a transmission way. The other side face also comprises two oil guide ribs, each oil guide rib is used for being connected to the outer peripheral wall of one intermediate shaft cavity, the inner peripheral wall of each intermediate shaft cavity comprises an opening, one opening is adjacent to one oil guide rib, and one oil guide rib is used for guiding cooling liquid to be input into one intermediate shaft cavity connected with the one oil guide rib through one opening.

In the embodiment of the application, the double-motor power assembly comprises two intermediate shafts, and one integrated shell comprises two intermediate shaft cavities, and the two intermediate shaft cavities respectively penetrate through one integrated shell along the axial direction of one motor or one generator. One intermediate shaft cavity is used for accommodating one intermediate shaft, and the other intermediate shaft cavity is used for accommodating the other intermediate shaft.

In the embodiment of the application, one intermediate shaft cavity is used for fixing the outer ring of a bearing of one intermediate shaft, and one intermediate shaft is used for connecting a transmission shaft and one large disc gear in a transmission way, so that one intermediate shaft can drive one large disc gear to rotate by the kinetic energy of the rotor transmission of one motor received by one transmission shaft, and further drive the wheels to rotate. Therefore, the kinetic energy transmitted by the rotor of one motor can be decelerated through one intermediate shaft, and then the kinetic energy is transmitted to the wheels in a deceleration way, so that the vehicle is driven to run.

In the embodiment of the application, the other intermediate shaft cavity is used for fixing the outer ring of the bearing of the other intermediate shaft, and the other intermediate shaft is used for connecting the other transmission shaft and the one engine shaft in a transmission way, so that the other intermediate shaft receives the kinetic energy from the one engine shaft and transmits the kinetic energy to the other transmission shaft, and further drives the rotor of the one generator to rotate, so that the one generator converts the kinetic energy into electric energy and charges the power battery.

In the embodiment of the application, the other side surface also comprises two oil guide ribs, so that the two oil guide ribs and a plurality of gears of the two gear sets are arranged on the same side, cooling liquid in the inner cavity of the integrated shell stirred by rotation of the two gear sets is favorably guided by the two oil guide ribs to be conveyed into the two intermediate shaft cavities for cooling and lubricating bearings of the two intermediate shafts in the two intermediate shaft cavities, and cooling liquid sprayed by an oil nozzle can be favorably guided into the two intermediate shaft cavities from the oil guide ribs for cooling and lubricating the bearings of the two intermediate shafts.

In the embodiment of the application, each oil guide rib is used for being connected to the outer peripheral wall of one intermediate shaft cavity, the inner peripheral wall of each intermediate shaft cavity comprises an opening, one opening is adjacent to one oil guide rib, one oil guide rib is used for guiding cooling liquid to be input into one intermediate shaft cavity connected with the oil guide rib through one opening, each oil guide rib can receive the cooling liquid from one oil nozzle or a plurality of gear liquid outlet holes, one opening is adjacent to one oil guide rib, so that the cooling liquid flowing through the oil guide rib from the outer peripheral wall of one intermediate shaft cavity can flow into one intermediate shaft cavity through one opening to cool and lubricate a bearing in one intermediate shaft cavity, and the cooling liquid flowing through the oil guide rib from the outer peripheral wall of the other intermediate shaft cavity can flow into the other intermediate shaft cavity through the other opening to cool and lubricate the bearing in the other intermediate shaft cavity.

In one embodiment, two oil ribs are aligned between the two intermediate shaft chambers in the direction of alignment of the two intermediate shaft chambers. The distance between the two openings of the two intermediate shaft cavities is smaller than the distance between the axes of the two intermediate shaft cavities.

In the embodiment of the application, along the arrangement direction of the two intermediate shaft cavities, one inner runner is arranged between the two intermediate shaft cavities, and the two oil guide ribs are arranged between the two intermediate shaft cavities, so that the two oil guide ribs are arranged on two sides of one inner runner, the two oil guide ribs are beneficial to guiding cooling liquid in one inner runner into the two intermediate shaft cavities respectively, the cooling efficiency is improved, the arrangement of the two oil guide ribs is beneficial to not influencing the layout of the two gear sets, and the two oil guide ribs are beneficial to fully utilizing the space between the two intermediate shaft cavities. The cooling liquid can be conveyed into the two intermediate shaft cavities through the oil guide ribs in a shorter path, so that the cooling efficiency is improved, the material of the oil guide ribs can be saved, and the production cost is reduced.

In the embodiment of the application, the distance between the two open holes of the two intermediate shaft cavities is smaller than the distance between the axes of the two intermediate shaft cavities, namely, the two open holes of the two intermediate shaft cavities are arranged at one side of the two intermediate shaft cavities close to one inner flow passage, so that the two open holes can receive the cooling liquid guided by the two oil guide ribs more quickly, and the cooling liquid can be conveyed into the two intermediate shaft cavities to cool and lubricate the bearings of the two intermediate shafts.

In one embodiment, the integrated housing further includes another internal flow passage and an oil pump groove. Wherein the other internal flow passage is used for communicating with an oil pump groove, the oil pump groove is used for accommodating an oil pump, and the oil pump is used for receiving cooling liquid through the other internal flow passage and outputting the cooling liquid through the one internal flow passage.

In the embodiment of the application, the other internal flow channel is used for conveying the cooling liquid to one internal flow channel and receiving the cooling liquid output by the one internal flow channel, so that the one internal flow channel and the other internal flow channel in the integrated shell form circulation, the cooling liquid can be recycled, and the requirement of the cooling liquid is reduced. It should be noted that in the embodiment of the present application, another internal flow channel may not be a physically existing pipe.

In the embodiment of the application, the other internal flow passage is used for being communicated with an oil pump groove, the one oil pump groove is used for containing an oil pump, the one oil pump is used for receiving cooling liquid through the other internal flow passage and outputting the cooling liquid through the one internal flow passage, and the one oil pump is used for providing hydraulic pressure for the cooling liquid flowing into the one oil pump in the other internal flow passage, so that the cooling liquid can be pumped into the one internal flow passage from the one oil pump, the cooling liquid can flow in the one internal flow passage, and the cooling liquid in the one internal flow passage can cool down the stator of a generator and the stator of a motor, and cool and lubricate a plurality of gears of two gear sets, two intermediate shafts and bearings of two transmission shafts.

In one embodiment, the inner groove wall of each groove further comprises a liquid return hole, and the two liquid return holes of the two grooves are used for conveying the cooling liquid to the other inner flow channel respectively. The distance between the two liquid return holes is larger than the distance between the stator of one motor and the stator of one generator along the radial direction of one generator or one motor.

In the embodiment of the application, the inner groove wall of each groove further comprises a liquid return hole, the two liquid return holes of the two grooves are used for respectively conveying cooling liquid to the other inner flow passage, one groove is used for fixing the stator of one motor, and the other groove is used for fixing the stator of one generator, so that the cooling liquid for cooling the stator of one generator and the stator of one motor can be recovered and recycled, and the requirement of the cooling liquid is reduced. Wherein the other internal oil passage includes a flow passage between the two liquid return holes to the inlet of one oil pump groove, and the other internal oil passage includes a space portion in the speed reducer accommodating chamber.

In the embodiment of the application, along the radial direction of one generator or one motor, the distance between the two liquid return holes is larger than the distance between the stator of one motor and the stator of one generator, namely, the two liquid return holes can be respectively arranged below the two grooves close to the stator of one motor and the stator of one generator, so that cooling liquid in the two grooves can flow back to the other internal flow channel from the two liquid return holes under the action of gravity, the power loss is reduced, and the recycling of the cooling liquid is realized.

In the embodiment of the application, the cooling liquid in the oil pump groove sequentially flows through one inner flow passage, two liquid return holes of two grooves and the other inner flow passage, and then flows back to the oil pump groove to form circulation.

In one embodiment, an integrated housing further includes a main oil hole for communicating the two secondary oil holes through an internal flow passage and two secondary oil holes, an opening of the main oil hole and an opening of each secondary oil hole for receiving the closure member. Wherein, along the radial direction of a generator or a motor, a main oil hole and two secondary oil holes are respectively arranged at two sides of two grooves.

In the embodiment of the application, the integrated shell further comprises a main oil hole and two secondary oil holes, wherein the main oil hole is used for receiving the cooling liquid from the other internal flow passage and inputting the cooling liquid into the one internal flow passage, and the two secondary oil holes form two parallel oil paths, so that the cooling liquid is favorably split, the flow resistance of the cooling liquid is reduced, the oil pumping capacity of the oil pump is improved, and the cooling efficiency of the double-motor power assembly is favorably improved.

In the embodiment of the application, one main oil hole is used for communicating two secondary oil holes through one internal flow channel, the opening of one main oil hole and the opening of each secondary oil hole are used for accommodating the plugging piece, the opening of one main oil hole is convenient for processing one main oil hole inwards from the outer side of the integrated shell, and the opening of each secondary oil hole is convenient for processing each secondary oil hole inwards from the outer side of the integrated shell. In one implementation, the opening of the main oil hole and the main oil way are integrally molded in a die-casting mode, so that the opening of the main oil hole and the main oil hole do not need to be processed separately, the process is saved, and the processing and manufacturing difficulty of the main oil hole is reduced. The blocking piece is positioned in the opening of one main oil hole so as to block the main oil hole and prevent oil in the main oil hole from leaking from the main oil hole.

In one embodiment, the opening orientation of one main oil hole is opposite to the opening orientation of one of the two sub oil holes, and the opening orientation of the other of the two sub oil holes intersects with the opening orientation of one main oil hole. The distance between one main oil hole and any one of the two secondary oil holes is larger than the inner diameter of each groove. The distance between one main oil hole and one secondary oil hole is larger than the distance between one main oil hole and one stator liquid outlet hole of one groove. The distance between one main oil hole and the other secondary oil hole is larger than the distance between one main oil hole and one stator liquid outlet hole of the other groove.

In the embodiment of the application, the opening direction of one main oil hole is opposite to the opening direction of one secondary oil hole of the two secondary oil holes, so that the integrated shell can be respectively processed into a part of an internal flow passage from two opposite directions, which is beneficial to shortening the drawing path, reducing the drawing difficulty and improving the reliability of the integrated shell. The opening orientation of the other secondary oil hole of two secondary oil holes intersects in the opening orientation of a main oil hole, namely the opening orientation of a secondary oil hole also intersects in the opening orientation of a secondary oil hole, so that cooling liquid in an inner runner can be split after flowing through a main oil hole, the flow resistance of the cooling liquid in the inner runner can be reduced, the power loss can be reduced, the parallel cooling of the cooling liquid to a stator of a generator and a stator of a motor can be realized, the flow path of the cooling liquid can be shortened, and the cooling efficiency can be improved. In addition, the opening orientation of one main oil hole is opposite to the opening orientation of one secondary oil hole of the two secondary oil holes, and the opening orientation of the other secondary oil hole of the two secondary oil holes intersects with the opening orientation of one main oil hole. The main oil hole and the secondary oil holes are processed in different directions of the integrated shell, the integral structural strength of the integrated shell is guaranteed, the integral structural strength of a certain part of the integrated shell is not lower, and the integral structural strength of the integrated shell is reduced.

In the embodiment of the application, the distance between one main oil hole and any one of the two secondary oil holes is larger than the inner diameter of each groove, so that the main oil hole and the two secondary oil holes are arranged on two sides of the two grooves respectively, the main oil hole is arranged in the middle of one side, which is close to the two grooves, of the two grooves, the machining and casting of the main oil hole are facilitated, the adverse effect on the two grooves is avoided, and after the cooling liquid is input into an internal flow passage from the main oil hole, the cooling liquid is sprayed to the two gear sets through a gear liquid outlet hole, a bearing liquid outlet hole, an oil nozzle and the like in a short path, and the cooling liquid is cooled and lubricated on the two gear sets and the bearing. The two secondary oil holes are arranged on two sides of the two grooves, so that arrangement of two secondary oil hole pipelines is facilitated, the two secondary oil holes are used for conveying cooling liquid in one inner flow channel to the two grooves from the outer sides of the two grooves respectively, cooling of a stator of a generator and a stator of a motor is facilitated, spraying and cooling areas of the cooling liquid are increased, and cooling effect of the double-motor power assembly is improved.

In the embodiment of the application, the distance between the main oil hole and the secondary oil hole is larger than the distance between the main oil hole and the stator liquid outlet hole of the groove, and the distance between the main oil hole and the stator liquid outlet hole of the groove is smaller, so that the stator liquid outlet hole is favorably arranged on the inner groove wall of the groove, the stator of the motor is sprayed with cooling liquid, and the stator of the motor is cooled. The distance between the main oil hole and the secondary oil hole is larger, so that the secondary oil hole is arranged on the outer side of the groove, the secondary oil hole is machined inwards from the outer side of the integrated shell, and the structural strength of the groove cannot be affected.

In the embodiment of the application, the distance between one main oil hole and the other secondary oil hole is larger than the distance between one main oil hole and one stator liquid outlet hole of the other groove, so that the stator liquid outlet hole is arranged on the inner groove wall of the other groove, cooling liquid is sprayed on the stator of one generator, and the stator of one generator is cooled. The distance between one main oil hole and the other secondary oil hole is larger, so that the other secondary oil hole is arranged on the outer side of the other groove, the other secondary oil hole is processed inwards from the outer side of the integrated shell, and the structural strength of the other groove is not influenced.

In one embodiment, an integrated housing includes two mounting surfaces, the two mounting surfaces being opposed in an axial direction of a generator or a motor, each mounting surface for securing a cover plate, and at least one mounting surface includes two oil holes for communicating an internal oil passage with an internal oil passage of a cover plate. Wherein openings of two oil holes face one cover plate along the axial direction of one motor or one generator.

In the embodiment of the application, each mounting surface is used for being fixedly connected with one cover plate, and each mounting surface can be a plane or a concave-convex surface, so long as each mounting surface is ensured to be capable of being fixed with one cover plate. Illustratively, one mounting face of the integrated housing and one mounting face of the cover plate are planar. Illustratively, one mounting face of the integrated housing and one mounting face of the cover plate are in a male-female fit.

In the embodiment of the application, at least one mounting surface comprises two oil holes, and the two oil holes are used for communicating an inner flow passage and an inner oil passage of a cover plate, so that cooling liquid in the inner flow passage of an integrated shell can flow into the inner oil passage of the cover plate, and the liquid of an inner part close to the cover plate can be lubricated and cooled, thereby being beneficial to the cooling and lubricating pipeline inside the double-motor power assembly to be more complete and improving the cooling and lubricating efficiency of the double-motor power assembly.

In the embodiment of the application, the internal oil duct of one cover plate is formed in one cover plate in a die-casting way, so that the pipeline arrangement outside the one cover plate is reduced, the whole volume of the double-motor power assembly is reduced, the die-casting material is saved, and the production cost is reduced.

In the embodiment of the application, the openings of the two oil holes face to one cover plate along the axial direction of one motor or one generator, so that the cooling liquid in the two oil holes can smoothly flow into the internal oil passage of one cover plate.

In a second aspect, embodiments of the present application provide a vehicle comprising a frame for securing a dual-motor powertrain, one motor of the dual-motor powertrain being adapted to be drivingly connected to wheels through one gear set of the dual-motor powertrain, and one generator of the dual-motor powertrain being adapted to be drivingly connected to an engine through another gear set of the dual-motor powertrain, and a dual-motor powertrain as described above.

In an embodiment of the present application, an integrated housing of a dual motor powertrain is used to house an electric motor, an electric generator, a gear set, and another gear set. Through an integrated internal runner in an integrated casing, the arrangement of external pipelines can be reduced, the integration level of the integrated casing is improved, the reliability of the double-motor power assembly is improved, the occupation of the internal runner to the space outside the integrated casing can be reduced, the miniaturized layout of the double-motor power assembly is realized, the die-casting material of the integrated casing is saved, and the cost is reduced. The cooling device also realizes the mode that the cooling liquid in one internal flow passage cools down the stator of one generator and the stator of one motor into parallel flow passages, and one internal flow passage cools down the stator of one motor and the stator of one generator, thereby being beneficial to improving the cooling efficiency of the double-motor power assembly, reducing the flow resistance of the system and reducing the power loss.

Drawings

In order to more clearly describe the technical solution in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.

Fig. 1 is a schematic structural view of a vehicle according to an embodiment of the present application;

FIG. 2 is a schematic illustration of a dual motor powertrain provided in accordance with an embodiment of the present application;

FIG. 3 is a schematic diagram of an integrated housing of a dual motor powertrain according to an embodiment of the present application;

FIG. 4 is another schematic structural view of an integrated housing provided by an embodiment of the present application;

FIG. 5 is another schematic view of an integrated housing according to an embodiment of the present application;

FIG. 6 is an enlarged partial view of the M1 portion of the integrated housing of FIG. 3;

FIG. 7 is an enlarged partial view of the M2 portion of the integrated housing of FIG. 3;

FIG. 8 is a cross-sectional view of the integrated housing of FIG. 3 taken along line AA;

FIG. 9 is a cross-sectional view of the integrated housing of FIG. 3 taken along BB;

FIG. 10 is a cross-sectional view of the integrated housing of FIG. 3 taken along CC;

FIG. 11 is an enlarged partial view of the portion M3 of the integrated housing of FIG. 5;

FIG. 12 is a cross-sectional view of an oil pump groove provided by an embodiment of the present application;

FIG. 13 is a schematic view of a cover plate according to an embodiment of the present application;

fig. 14 is a schematic structural view of another cover plate according to an embodiment of the present application.

Detailed Description

The following description of the technical solutions according to the embodiments of the present application will be given with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments.

For convenience of understanding, the following description will explain and describe related technical terms related to the embodiments of the present application.

Alignment: the alignment of two oil holes in the axial direction of one motor or one generator means that the central axes of the two oil holes in the axial direction are collinear.

Staggering: the stagger of the two oil holes along the axial direction of one motor or one generator means that the central axes of the two oil holes along the axial direction are different.

In order to improve the cooling efficiency of the double-motor power assembly, the energy consumption is reduced, and the performance of the whole vehicle is improved. The application provides a double-motor power assembly with integrated flow channels, which comprises a motor, a generator and an integrated shell which is integrally die-cast, wherein the integrated shell comprises an inner flow channel and two grooves, the inner flow channel is used for transmitting cooling liquid, the groove is used for fixing a stator of the motor, the other groove is used for fixing a stator of the generator, the inner groove wall of each groove comprises a stator liquid outlet hole, and each stator liquid outlet hole is used for communicating with one inner flow channel to receive the cooling liquid. Through an integrated internal runner in an integrated casing, reduce the arrangement of outside pipeline, improve the integrated level of an integrated casing, improve the reliability of two motor power assembly, can also reduce the space occupation of an internal runner outside an integrated casing, realize the miniaturized overall arrangement of two motor power assembly, still be favorable to saving the die casting material of an integrated casing, reduce cost. The inner groove wall of each groove comprises a stator liquid outlet hole, so that the cooling mode that the cooling liquid in an inner flow channel cools the stator of one generator and the stator of one motor into parallel flow channels is realized, and the cooling mode that the inner flow channel cools the stator of one motor and the stator of one generator is favorable for improving the cooling efficiency of the double-motor power assembly, reducing the flow resistance of the system and reducing the power loss.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1 according to an embodiment of the present application, the vehicle 1 includes a frame 20, wheels 40, a power battery 30 and a dual-motor power assembly 10, the frame 20 is used for fixing the dual-motor power assembly 10, the wheels 40 and the power battery 30, the dual-motor power assembly 10 is in transmission connection with the wheels 40, the power battery 30 provides electric energy for the dual-motor power assembly 10, and the dual-motor power assembly 10 can also charge the power battery 30. In the present embodiment, the vehicle 1 is an automobile. The two-motor powertrain 10 is capable of driving the wheels 40 in rotation, i.e. the vehicle 1 is a hybrid vehicle.

The housing-integrated flow path dual motor powertrain 10 of the present application is described in detail below.

Referring to fig. 1 and 2, fig. 2 is a schematic diagram of a dual-motor power assembly 10 according to an embodiment of the application.

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 14. Wherein the engine 16 is for outputting power. For example, the engine 16 may be a fuel engine including a gasoline engine, a diesel engine. The generator 12 is in driving connection with the engine 16, the engine 16 provides power to the generator 12, and the generator 12 converts kinetic energy output by the engine 16 into electrical energy. The generator 12 is electrically connected to the power cell 30, and the generator 12 may charge the power cell 30 via the power supply 14. The motor 11 is electrically connected to a power battery 30, and the power battery 30 can supply power to the motor 11 through a power supply device 14. The motor 11 is used to convert electric energy output from the power battery 30 into kinetic energy. The motor 11, the generator 12 and the motor 11 are in transmission connection with the wheels 40 through the reducer 13 to provide power to the wheels 40 to drive the wheels 40 to move.

In one embodiment, the power supply device 14 includes at least one of a motor controller, an on-board charging device, a DC conversion device, a DC power supply device, and a vehicle controller. The power supply device 14 is electrically connected to the engine 16, the motor 11, the generator 12, and the speed reducer 13, and is configured to control switching of the power modes of the two-motor powertrain 10.

Referring to fig. 3, fig. 4 and fig. 5, fig. 3 is a schematic structural diagram of an integrated housing 100 of a dual-motor power assembly 10 according to an embodiment of the application, and fig. 4 is another schematic structural diagram of the integrated housing 100 according to an embodiment of the application. Fig. 5 is a schematic diagram of another structure of the integrated housing 100 according to an embodiment of the present application.

In one embodiment, a dual motor powertrain 10 with integrated flow passages for a housing includes a motor 11, a generator 12, a reducer 13, an integrated housing 100 that is die cast integrally, and two cover plates (not shown), as shown in fig. 3 and 4, the intermediate housing may be a die cast integrally formed housing. The intermediate housing may also be referred to as an integrated housing 100, an assembly housing, a die cast housing. The gear assembly in one of the reducers 13 is adapted to be in driving connection with one of the motors 11 and one of the generators 12. The speed reducer 13 in fig. 3 is a schematic position of the speed reducer 13, and the generator 12 and the motor 11 in fig. 4 are schematic positions of the generator 12 and the motor 11.

In one embodiment, the integrated housing 100 and the two cover plates form a decelerator accommodating chamber 500 and a motor accommodating chamber 600, respectively, the decelerator accommodating chamber 500 for accommodating a gear assembly of one decelerator 13, and the motor accommodating chamber 600 for accommodating one motor 11 and one generator 12.

In one embodiment, one integrated housing 100 includes one inner flow channel 140 and two grooves 110, one inner flow channel 140 for transmitting cooling liquid, and two grooves 110 are respectively denoted as one groove 110a and the other groove 110b, wherein one groove 110a is used for fixing a stator of one motor 11, the other groove 110b is used for fixing a stator of one generator 12, and an inner groove wall of each groove 110 includes one stator outlet 113, and each stator outlet 113 is used for communicating with one inner flow channel 140 to receive cooling liquid.

In the embodiment of the present application, an integrated housing 100 is provided for accommodating an electric motor 11 and an electric generator 12. An integrated housing 100 is formed by integral die casting, and has simple and convenient processing technology, and is also beneficial to improving the structural stability of the double-motor power assembly 10 and improving the integration level of the double-motor power assembly 10.

In the embodiment of the present application, one integrated housing 100 includes one internal flow channel 140, and one internal flow channel 140 is integrated in one integrated housing 100, which is favorable for reducing the arrangement of external pipelines, improving the integration level of one integrated housing 100, reducing the occupation of space of one internal flow channel 140 outside one integrated housing 100, realizing the miniaturized layout of the dual-motor power assembly 10, saving the die casting material of one integrated housing 100, and reducing the cost. One inner flow passage 140 is used for conveying cooling liquid, one inner flow passage 140 is used for circulating the cooling liquid to cool down one motor 11 and one generator 12 in one integrated shell 100, so that the overheating problem of one generator 12 and one motor 11 is avoided, and the normal operation of one generator 12 and one motor 11 is ensured.

In the embodiment of the present application, as shown in fig. 4, one integrated housing 100 includes two grooves 110, one groove 110a is used for fixing the stator of one motor 11, the other groove 110b is used for fixing the stator of one generator 12, and the inner sidewall of each groove 110 includes one stator outlet 113, so that the cooling liquid in one inner flow channel 140 can flow into the two grooves 110 to cool down the stator of one motor 11 and the stator of one generator 12. Each stator outlet 113 is used for communicating one internal flow channel 140 to receive cooling liquid, so that the cooling liquid in one internal flow channel 140 flows into the stator outlet 113 of two grooves 110 respectively, a mode that cooling liquid in one internal flow channel 140 cools down the stator of one generator 12 and the stator of one motor 11 into parallel flow channels is realized, and one internal flow channel 140 cools down the stator of one motor 11 and the stator of one generator 12 simultaneously, thereby being beneficial to improving the cooling efficiency of the double-motor power assembly 10. Compared with the cooling of the stator of the generator 12 and the stator of the motor 11 which are sequentially realized by a serial runner, the parallel connection of the cooling runners is beneficial to reducing the flow resistance of the system, reducing the power loss, improving the oil pumping capacity of the oil pump 15 and improving the cooling efficiency of the double-motor power assembly 10.

The cooling liquid comprises glycol cooling oil, synthetic oil, mineral oil and the like, is used for cooling and lubricating components in the whole vehicle operation, and is exemplified by the glycol cooling oil.

In one embodiment, the dual motor powertrain 10 further includes an oil pump 15, as shown in fig. 3, the oil pump 15 is configured to deliver coolant from an oil reservoir of the reducer housing 500 to the stator outlet 113 of the two grooves 110 through one of the internal flow passages 140, the oil reservoir being located at the bottom of the reducer housing 500.

In one embodiment, each groove 110 includes an axial groove bottom 111 and a circumferential groove wall 112. As shown in fig. 4, one stator outlet 113a penetrates the circumferential groove wall 112a of one groove 110a in the radial direction R1 of one motor 11. In the radial direction R2 of one generator 12, the other stator outlet 113b penetrates the circumferential groove wall 112b of the other groove 110 b.

In the embodiment of the present 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 for fixing the stator of one motor 11, and the circumferential groove wall 112b of the other groove 110b is used for fixing the stator of one generator 12.

In the embodiment of the present application, along the radial direction R1 of one motor 11, one stator outlet hole 113a penetrates through the circumferential groove wall 112a of one groove 110a, so that the cooling liquid input from one stator outlet hole 113a can be sprayed to the outer circumferential surface of the stator of one motor 11, the spraying area of the cooling liquid is enlarged, the cooling area of the cooling liquid to the stator of one motor 11 is increased, and the cooling efficiency of one motor 11 is improved. If one stator liquid outlet hole 113a penetrates through the axial groove bottom 111a of one groove 110a, more cooling liquid is sprayed on the end face of the stator of one motor 11, the cooling effect on the stator of one motor 11 is poor, and the improvement of the cooling efficiency is not good.

In the embodiment of the present application, along the radial direction R2 of one generator 12, the other stator outlet hole 113b penetrates the circumferential groove wall 112b of the other groove 110b, so that the cooling liquid input from the other stator outlet hole 113b can be sprayed to the outer circumferential surface of the stator of one generator 12, the spraying area of the cooling liquid is enlarged, the cooling area of the cooling liquid to the stator of one generator 12 is increased, and the cooling efficiency of one generator 12 is improved. If the other stator outlet 113b penetrates the axial slot bottom 111b of the other groove 110b, the cooling liquid is more sprayed on the end face of the stator of one generator 12, which is not good enough for cooling the stator of one generator 12, and is not good for improving the cooling efficiency.

In one embodiment, as shown in fig. 4, the openings of the two grooves 110 are the same, and the stator of one generator 12 and the stator of one motor 11 are arranged on the same side along the axial direction O of the dual-motor power assembly 10, so that the stator of one generator 12 and the stator of one motor 11 are arranged more compactly, but occupy the space of the dual-motor power assembly 10 in the axial direction O, which is beneficial to reducing the overall volume of the dual-motor power assembly 10 and the miniaturized layout of the dual-motor power assembly 10.

In one embodiment, the spacing between the two stator outlet holes 113a, 113b is greater than the spacing between the two grooves 110a, 110 b.

As shown in fig. 5, in the embodiment of the present application, the distance between the two stator liquid outlets 113a and 113b is denoted as L1, the distance between the two grooves 110a and 110b is denoted as L2, L1 > L2, and L1 is larger, which is advantageous for arranging the two stator liquid outlets 113a and 113b at the high positions of the two grooves 110a and 110b, for spraying the cooling liquid to the stator of one generator 12 and the stator of one motor 11 along the gravity direction, for cooling the stator of one generator 12 and the stator of one motor 11, for reducing the power loss, and for increasing the area of the cooling liquid sprayed to the stator of one generator 12 and the stator of one motor 11 in the two stator liquid outlets 113a and 113b, and for improving the cooling efficiency of one generator 12 and one motor 11. It should be noted that, in fig. 5, the two stator outlet holes 113a and 113b are schematic positions of the two stator outlet holes 113a and 113b, and the specific positions refer to the two stator outlet holes 113a and 113b in fig. 4.

In one embodiment, the dual motor powertrain 10 includes two gear sets 115, one motor 11 for driving one gear set 115a and one generator 12 for driving the other gear set 115b, as shown in fig. 3 and 4, and one integrated housing 100 includes two sides 160 opposite sides 160 along the axial direction O of one motor 11 or one generator 12. One side 160a includes two grooves 110, and the two grooves 110 are arranged at intervals in the radial direction R1, R2 of one motor 11 or one generator 12. The other side 160b is configured to receive a plurality of gears of the two gear sets 115, and the other side 160b includes one or more gear outlet holes 104, each gear outlet hole 104 configured to receive a cooling fluid in communication with one of the internal flow passages 140.

In the embodiment of the present application, one motor 11 is used for being in transmission connection with one gear set 115a, one gear set 115a is used for being in transmission connection with one motor 11 and the wheel 40, one gear set 115a receives mechanical energy of one motor 11, and the mechanical energy is transmitted to the wheel 40 after being decelerated by one gear set 115a, so that the wheel 40 is driven to rotate. One generator 12 is adapted to be drivingly connected to another gear set 115b, the other gear set 115b is adapted to drivingly connect the one generator 12 to an engine 16, and the one generator 12 receives mechanical energy transmitted from the one engine 16 through the other gear set 115b for driving the one generator 12 to operate. It should be noted that the structure of the two gear sets 115 is not shown in fig. 3, and the two gear sets 115 are shown in the schematic positions of the two gear sets 115 in fig. 3, and the structure of the two gear sets 115 may be designed according to need.

In the embodiment of the present application, one integrated housing 100 includes two sides 160, which are opposite to each other along the axial direction O of one motor 11 or one generator 12, so that two gear sets 115 and one generator 12 and one motor 11 may be disposed on the two sides 160, respectively, in a regular arrangement. The axial direction O of the two-motor power unit 10, the axial direction O of one motor 11, and the axial direction O of one generator 12 are parallel to each other.

In the embodiment of the present application, one side 160a includes two grooves 110, as shown in fig. 4, 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 for fixing the stator of one motor 11, and the other groove 110b is used for fixing the stator of one generator 12, so that the stator of one motor 11 and the stator of one generator 12 are arranged at intervals along the radial directions R1 and R2 of one motor 11 or one generator 12, which is beneficial to guaranteeing that one motor 11 and one generator 12 operate relatively independently. In addition, the two grooves 110 are disposed on one side 160a (as shown in fig. 4), which is advantageous in reducing the space occupation of one generator 12 and one motor 11 along the axial direction O of the dual-motor powertrain 10, reducing the overall volume of the dual-motor powertrain 10, and miniaturizing the dual-motor powertrain 10.

In an embodiment of the present application, the other side 160b is configured to receive a plurality of gears of the two gear sets 115, as shown in fig. 3, and the plurality of gears of the two gear sets 115 are disposed opposite to one generator 12 and one engine 16 along the dual-motor powertrain 10, which is advantageous for proper arrangement of the dual-motor powertrain 10. The other side 160b includes one or more gear liquid outlet holes 104, and each gear liquid outlet hole 104 is used for communicating with one internal flow channel 140 to receive cooling liquid, so that each gear liquid outlet hole 104 can receive the cooling liquid from one internal flow channel 140, lubricate and cool the gears of the two gear sets 115, thereby being beneficial to ensuring the normal operation of the dual-motor power assembly 10 and improving the cooling efficiency of the dual-motor power assembly 10.

In one embodiment, the dual motor powertrain 10 includes two drive shafts 191 and one integrated housing 100 includes two drive shaft cavities 181, as shown in fig. 3, with the two drive shaft cavities 181 extending through one integrated housing 100 in the axial direction O of one motor 11 or one generator 12, respectively. One of the drive shaft cavities 181a is for fixing the outer race of a bearing of one of the drive shafts 191a, and one of the drive shafts 191a is for drivingly connecting one of the gears of one of the gear sets 115a and the rotor of one of the motors 11. The other drive shaft cavity 181b is used for fixing the outer race of the bearing of the other drive shaft 191b, and the other drive shaft 191b is used for drivingly connecting one gear of the other gear set 115b and the rotor of one generator 12. The inner peripheral wall of each drive shaft cavity 181 includes a bearing outlet 105, and the bearing outlets 105 of the two drive shaft cavities 181 are respectively used for communicating with an internal flow channel 140 to receive the cooling liquid. In fig. 3, the structure of the two drive shafts 191 is not shown, and in fig. 3, the two drive shafts 191 are schematic positions of the two drive shafts 191.

In the embodiment of the present application, the dual-motor powertrain 10 includes two transmission shafts 191, one integrated housing 100 includes two transmission shaft cavities 181, the two transmission shaft cavities 181 penetrate through the one integrated housing 100 along the axial direction O of one motor 11 or one generator 12, and the two transmission shaft cavities 181 are respectively used for accommodating one of the two transmission shafts 191, so that the transmission connection between one motor 11 and one transmission shaft 191a is facilitated, and the transmission connection between one generator 12 and the other transmission shaft 191b is also facilitated.

In the embodiment of the present application, one transmission shaft cavity 181a is used for fixing the outer ring of the bearing of one transmission shaft 191a, one transmission shaft 191a is used for connecting one gear in one gear set 115a and the rotor of one motor 11 in a transmission manner, that is, one transmission shaft 191a can connect one motor 11 and one gear set 115a in a transmission manner, so that one gear in one gear set 115a is beneficial to receiving kinetic energy transmitted by the rotor of one motor 11, and is decelerated by other gears in one gear set 115a, and finally the kinetic energy is transmitted to the wheels 40 to drive the vehicle 1.

In the embodiment of the present application, the other transmission shaft cavity 181b is used for fixing the outer ring of the bearing of the other transmission shaft 191b, and the other transmission shaft 191b is used for driving and connecting one gear of the other gear set 115b and the rotor of the one generator 12, that is, the other transmission shaft 191b can connect the one generator 12 and the other gear set 115b in a driving manner, so that the one gear of the other gear set 115b is beneficial to receive kinetic energy from the one engine 16 and transmit the kinetic energy to the one generator 12, so as to drive the one generator 12 to convert the kinetic energy into electric energy, and charge the power battery 30.

In the embodiment of the present application, the inner peripheral wall of each transmission shaft cavity 181 includes a bearing liquid outlet 105, and the bearing liquid outlet 105 of each transmission shaft cavity 181 is respectively used for communicating with one internal flow channel 140 to receive cooling liquid, so that the cooling liquid in one internal flow channel 140 can cool and lubricate the bearing of one transmission shaft 191a and the bearing of the other transmission shaft 191b from the bearing liquid outlet 105 of each transmission shaft cavity 181, which is beneficial to reducing the friction resistance of the transmission connection between one gear of one gear set 115a and the rotor of one motor 11 and reducing the friction resistance of the transmission connection between one gear of the other gear set 115b and the rotor of one generator 12, thereby making the transmission process smoother, being beneficial to reducing the power loss of the dual-motor power assembly 10 and improving the working performance of the dual-motor power assembly 10.

In one embodiment, as shown in fig. 3, an integrated housing 100 further includes a bearing liquid outlet connection hole 106, where the bearing liquid outlet connection hole 106 is used to communicate with an internal flow channel 140, and an opening of the bearing liquid outlet connection hole 106 is opposite to an opening direction of the bearing liquid outlet hole 105 a.

In the embodiment of the present application, a bearing outlet 105a of an integrated housing 100 is formed by drawing a mold at a bearing outlet connection hole 106, and an internal flow passage 140 and a bearing outlet 105a are communicated through the bearing outlet connection hole 106, so that a cooling liquid in the internal flow passage 140 can flow into the bearing outlet 105a to cool and lubricate a bearing of a transmission shaft 191 a.

Referring to fig. 3 and 6, fig. 6 is a partial enlarged view of a portion M1 of the integrated housing 100 in fig. 3. In one embodiment, as shown in fig. 6, along the arrangement direction of the two drive shaft cavities 181, the opening of one bearing liquid outlet 105a of the inner peripheral wall of one drive shaft cavity 181a faces away from the other drive shaft cavity 181b. The distance between the two transmission shaft cavities 181 is smaller than the distance between the bearing liquid outlet holes 105 of the two transmission shaft cavities 181.

In the embodiment of the present application, along the arrangement direction of the two driving shaft cavities 181, the opening of one bearing liquid outlet 105a of the inner peripheral wall of one driving shaft cavity 181a faces away from the other driving shaft cavity 181b, and the bearing liquid outlet 105 of the two driving shaft cavities 181 are respectively used for communicating one internal flow channel 140 to receive cooling liquid, so that the arrangement of one internal flow channel 140 between the two bearing liquid outlet 105 is facilitated, the cooling liquid in one internal flow channel 140 is facilitated to respectively convey the cooling liquid to the two bearing liquid outlet 105 in a shorter path, the bearing of one driving shaft 191a and the bearing of the other driving shaft 191b are cooled and lubricated, and the cooling efficiency of the dual-motor power assembly 10 is improved.

In the embodiment of the present application, as shown in fig. 6, the distance between the two driving shaft cavities 181 is denoted as L3, the distance between the bearing liquid outlets 105 of the two driving shaft cavities 181 is denoted as L4, L3 < L4, that is, one bearing liquid outlet 105a of one driving shaft cavity 181a can be closer to the inside of one driving shaft cavity 181a, which is beneficial to the bearing liquid outlet 105a being closer to the bearing of one driving shaft 191a, and is beneficial to spraying the cooling liquid received by one bearing liquid outlet 105a in one internal runner 140 on the bearing of one driving shaft 191a, and cooling and lubricating the bearing of one driving shaft 191 a. The other bearing liquid outlet 105b of the other transmission shaft cavity 181b can be closer to the inside of the other transmission shaft cavity 181b, which is beneficial to the other bearing liquid outlet 105b to be closer to the bearing of the other transmission shaft 191b, and is beneficial to the cooling liquid received by the other bearing liquid outlet 105b by the one inner runner 140 to be sprayed on the bearing of the other transmission shaft 191b to cool and lubricate the bearing of the other transmission shaft 191 b. In the embodiment of the present application, the opening of the other bearing liquid outlet 105b faces downward along the gravity direction, so that the other bearing liquid outlet 105b can discharge liquid more smoothly, so as to realize cooling and lubrication on the bearing of the other transmission shaft 191 b.

In one embodiment, a gear outlet 104a is used to secure a fuel injector 194, as shown in fig. 6, and the distance between the gear outlet 104a and each of the drive shaft cavities 181 is smaller than the distance between two drive shaft cavities 181. The aperture of one gear outlet 104a is larger than the aperture of the other gear outlet 104.

In the embodiment of the present application, one gear liquid outlet 104a is used for fixing one oil nozzle 194, and one oil nozzle 194 is used for receiving the cooling liquid in one internal flow channel 140 and spraying the cooling liquid to a plurality of gears of two gear sets 115 for cooling and lubrication, which is beneficial to reducing friction resistance between the gears and reducing power loss. Note that the structure of one oil jet 194 is not shown in fig. 6, and one oil jet 194 is only a schematic position of one oil jet 194 in fig. 6.

In the embodiment of the present application, as shown in fig. 6, the distance between one gear liquid outlet 104a and one transmission shaft cavity 181a is denoted as L5, the distance between one gear liquid outlet 104a and the other transmission shaft cavity 181b is denoted as L6, the distance between two transmission shaft cavities 181 is denoted as L3, L5 < L3, L6 < L3, and one oil nozzle 194 is arranged between the two transmission shaft cavities 181, so that it is beneficial to arrange one oil nozzle 194 between the two gear sets 115, and therefore, the cooling liquid in one oil nozzle 194 can cool and lubricate the gears in one gear set 115a at the same time in a shorter path, and it is beneficial to improve the cooling and lubricating efficiency. The arrangement of the oil nozzle 194 avoiding the gears of the two gear sets 115 is also facilitated, and the normal rotation of a plurality of gears in the two gear sets 115 is not affected, so that the arrangement of the two gear sets 115 and the oil nozzle 194 is more regular and reasonable.

In the embodiment of the present application, the aperture of one gear liquid outlet 104a is larger than the aperture of other gear liquid outlet 104, so that more cooling liquid can flow in one oil nozzle 194, which is beneficial for one oil nozzle 194 to spray more cooling liquid to the gears of one gear set 115a, cool and lubricate the gears of one gear set 115a, and improve the cooling efficiency of the dual-motor power assembly 10.

In one embodiment, the dual motor powertrain 10 includes two intermediate shafts 192, as shown in FIG. 3, and one integrated housing 100 includes two intermediate shaft chambers 182, with the two intermediate shaft chambers 182 extending through one integrated housing 100 in the axial direction O of one motor 11 or one generator 12, respectively. One of the intermediate shaft chambers 182a is used for fixing the outer ring of a bearing of one intermediate shaft 192a, and one intermediate shaft 192a is used for connecting a transmission shaft 191a and a large disc gear 195 in a transmission manner. The other intermediate shaft cavity 182b is used for fixing the outer ring of the bearing of the other intermediate shaft 192b, and the other intermediate shaft 192b is used for drivingly connecting the other transmission shaft 191b and an engine shaft (not shown). The other side 160b further includes two oil guides 193a, 193b, each oil guide 193a, 193b being adapted to be connected to the outer peripheral wall of one intermediate shaft chamber 182a, the inner peripheral wall of each intermediate shaft chamber 182 including an opening 107, one opening 107 being adjacent to one oil guide 193, one oil guide 193 being adapted to guide the cooling fluid to be fed into one intermediate shaft chamber 182 connected thereto through one opening 107.

In the embodiment of the present application, the dual motor powertrain 10 includes two intermediate shafts 192, and one integrated housing 100 includes two intermediate shaft chambers 182, and the two intermediate shaft chambers 182 penetrate one integrated housing 100 in the axial direction O of one motor 11 or one generator 12, respectively. One intermediate shaft cavity 182a is for receiving one intermediate shaft 192a and the other intermediate shaft cavity 182b is for receiving the other intermediate shaft 192b.

In the embodiment of the present application, an intermediate shaft cavity 182a is used for fixing the outer ring of the bearing of an intermediate shaft 192a, and the intermediate shaft 192a is used for connecting a transmission shaft 191a and a large disc gear 195 in a transmission manner, so that the intermediate shaft 192a can drive the large disc gear 195 to rotate by the kinetic energy of the rotor transmission of the electric motor 11 received by the transmission shaft 191a, and further drive the wheels to rotate. So that the kinetic energy transmitted from the rotor of one of the electric motors 11 can be decelerated via one of the intermediate shafts 192a, and further, the decelerated kinetic energy is transmitted to the wheels 40, thereby driving the vehicle 1. In fig. 3, the structure of two intermediate shafts 192 and the structure of one large disc gear 195 are not shown, and in fig. 3, two intermediate shafts 192 are shown as schematic positions of two intermediate shafts 192, and in fig. 3, one large disc gear 195 is shown as schematic position of one large disc gear 195.

In the embodiment of the present application, the other intermediate shaft cavity 182b is used for fixing the outer ring of the bearing of the other intermediate shaft 192b, and the other intermediate shaft 192b is used for connecting the other transmission shaft 191b and the one engine shaft in a transmission manner, so that the other intermediate shaft 192b receives the kinetic energy from the shaft of the one engine 16 and transmits the kinetic energy to the other transmission shaft 191b, and further drives the rotor of the one generator 12 to rotate, so that the one generator 12 converts the kinetic energy into electric energy to charge the power battery 30.

In the embodiment of the present application, the other side 160b further includes two oil guiding ribs 193a and 193b, so that the two oil guiding ribs 193a and 193b and a plurality of gears of the two gear sets 115 are arranged on the same side, which is beneficial to guiding the cooling liquid in the oil storage pool stirred by the rotation of the two gear sets 115 through the two oil guiding ribs 193, guiding the cooling liquid to be conveyed into the two intermediate shaft cavities 182 for cooling and lubricating the bearings of the two intermediate shafts 192 in the two intermediate shaft cavities 182, and is beneficial to guiding the cooling liquid sprayed by the one oil nozzle 194 from the oil guiding ribs 193a and 193b into the two intermediate shaft cavities 182 for cooling and lubricating the bearings of the two intermediate shafts 192.

In the embodiment of the present application, each of the oil guide ribs 193a, 193b is adapted to be connected to the outer peripheral wall of one of the intermediate shaft chambers 182, the inner peripheral wall of each of the intermediate shaft chambers 182 includes an opening 107, one of the openings 107 is adjacent to one of the oil guide ribs 193, one of the oil guide ribs 193 is adapted to guide the cooling fluid to be supplied into the one of the intermediate shaft chambers 182 connected thereto through one of the openings 107, each of the oil guide ribs 193 is adapted to receive the cooling fluid from the one of the oil nozzles 194 or the plurality of gear fluid outlet holes 104, one of the openings 107a is adjacent to one of the oil guide ribs 193a, so that the cooling fluid flowing from the outer peripheral wall of one of the intermediate shaft chambers 182a through the one of the openings 107a into the one of the intermediate shaft chambers 182a cools and lubricates the bearing in the one of the intermediate shaft chambers 182a, and so that the cooling fluid flowing from the outer peripheral wall of the other intermediate shaft chamber 182b through the oil guide rib 193b can flow into the other of the other intermediate shaft chamber 182b through the other of the other opening 107b to lubricate the bearing in the other intermediate shaft 182 b.

Referring to fig. 3 and 7, fig. 7 is a partial enlarged view of a portion M2 of the integrated housing 100 in fig. 3, and in one embodiment, two oil guide ribs 193a, 193b are arranged between two intermediate shaft cavities 182 along the arrangement direction of the two intermediate shaft cavities 182. The spacing of the two openings 107a, 107b of the two intermediate shaft chambers 182 is smaller than the spacing of the axes of the two intermediate shaft chambers 182.

In the embodiment of the present application, as shown in fig. 7, along the arrangement direction of the two intermediate shaft cavities 182, one inner flow channel 140 is arranged between the two intermediate shaft cavities 182, and two oil guiding ribs 193a and 193b are arranged between the two intermediate shaft cavities 182, which is beneficial to arranging the two oil guiding ribs 193a and 193b at two sides of one inner flow channel 140, is beneficial to guiding the cooling liquid in one inner flow channel 140 into the two intermediate shaft cavities 182 respectively by the two oil guiding ribs 193a and 193b, improves the cooling efficiency, is beneficial to arranging the two oil guiding ribs 193a and 193b so as not to influence the layout of the two gear sets 115, and is beneficial to fully utilizing the space between the two intermediate shaft cavities 182 by the two oil guiding ribs 193a and 193 b. The cooling liquid can be conveyed into the two intermediate shaft cavities 182 through the oil guide ribs 193a and 193b in a shorter path, so that the cooling efficiency is improved, the materials of the oil guide ribs 193a and 193b can be saved, and the production cost is reduced.

In the embodiment of the present application, the distance between the two openings 107a, 107b of the two intermediate shaft cavities 182 is denoted as L7, the distance between the axes of the two intermediate shaft cavities 182 is denoted as L8, L7 < L8, that is, the two openings 107a, 107b of the two intermediate shaft cavities 182 are disposed on the side of the two intermediate shaft cavities 182 near one inner flow channel 140, so that the two openings 107a, 107b can receive the cooling liquid guided by the two oil guide ribs 193a, 193b more quickly, and convey the cooling liquid into the two intermediate shaft cavities 182 to cool and lubricate the bearings of the two intermediate shafts 192.

In one embodiment, as shown in fig. 7, an integrated housing 100 further includes an intermediate shaft cavity guide section 108, where one intermediate shaft cavity guide section 108 is used to input the cooling fluid in one internal flow channel 140 into another intermediate shaft cavity 182b, and cool and lubricate the bearing of another intermediate shaft 192b, so as to facilitate improving the temperature rise problem during the transmission connection of an engine shaft and another intermediate shaft 192b, and also facilitate reducing the friction resistance.

In one embodiment, as shown in fig. 3 and 6, the other side 160b further includes two oil guide ribs 193c and 193d, each oil guide rib 193c and 193d is used for being connected to the outer peripheral wall of one transmission shaft cavity 181, the inner peripheral wall of each transmission shaft cavity 181 includes an opening 107, as shown in fig. 3, one opening 107c is adjacent to one oil guide rib 193c, and one oil guide rib 193c is used for guiding cooling liquid to be input into one transmission shaft cavity 181a connected with the one oil guide rib 193c through one opening 107c, so that cooling lubrication is facilitated to the bearing of one transmission shaft 191a, and friction force for rotating one transmission shaft 191a is reduced. As shown in fig. 6, one opening 107d is adjacent to one oil guide rib 193d, and one oil guide rib 193d is used for guiding the cooling liquid to be input into the other transmission shaft cavity 181b connected with the one opening 107d, so that cooling and lubrication of the bearing of the other transmission shaft 191b are facilitated, the rotating friction force of the other transmission shaft 191b is reduced, and the cooling and lubrication efficiency of the dual-motor power assembly 10 is improved.

In one embodiment, as shown in fig. 7, the other side 160b further includes an oil guiding rib 193e, the oil guiding rib 193e is configured to be connected to an outer peripheral wall of the output shaft cavity 183, an inner peripheral wall of the output shaft cavity 183 includes an opening 107e, the opening 107e is adjacent to the oil guiding rib 193e, and the oil guiding rib 193a is configured to guide a cooling fluid to be input into the output shaft cavity 183 connected thereto through the opening 107e, so as to facilitate cooling and lubrication of a bearing of the output shaft 184, reduce a rotational friction force of the output shaft 184, and facilitate improvement of cooling and lubrication efficiency of the dual motor power assembly 10. It should be noted that, in fig. 7, one output shaft 184 is a schematic position of one output shaft 184.

In one embodiment, as shown in fig. 3, 6 and 7, the cooling fluid input into the two transmission shaft cavities 181, the two intermediate shaft cavities 182 and the one output shaft cavity 183 may be directly input through the bearing liquid outlet 105, or may be input through the matching mode of the oil guide ribs 193 and the openings 107.

In one embodiment, the integrated housing 100 further includes another internal flow passage 150 and an oil pump groove 120. As shown in fig. 3 and 5, the other internal flow passage 150 is for communicating with one oil pump groove 120, one oil pump groove 120 is for accommodating one oil pump 15, one oil pump 15 is for receiving the cooling liquid through the other internal flow passage 150 and for outputting the cooling liquid through one internal flow passage 140.

In the embodiment of the present application, the other internal flow channel 150 is used for delivering the cooling liquid to one internal flow channel 140 and receiving the cooling liquid output by one internal flow channel 140, so that one internal flow channel 140 and the other internal flow channel 150 in the integrated housing 100 form a circulation, so that the cooling liquid can be recycled, which is beneficial to reducing the requirement of the cooling liquid. It should be noted that, in the embodiment of the present application, the other internal flow channel 150 may not be a physically existing pipe.

In the embodiment of the present application, the other internal flow passage 150 is used to communicate with one oil pump groove 120, one oil pump groove 120 is used to accommodate one oil pump 15, one oil pump 15 is used to receive cooling liquid through the other internal flow passage 150 and to output cooling liquid through one internal flow passage 140, one oil pump 15 is used to provide hydraulic pressure for the cooling liquid flowing into the one oil pump 15 in the other internal flow passage 150, so that the cooling liquid can be pumped from the one oil pump 15 into the one internal flow passage 140, so that the cooling liquid in the one internal flow passage 140 can cool down the stator of one generator 12, the stator of one motor 11, and cool and lubricate the gears of two gear sets 115 and the bearings of two intermediate shafts 192 and two transmission shafts 191.

In one embodiment, the inner groove wall of each groove 110 further includes one liquid return hole 114, as shown in fig. 3 and 5, and the two liquid return holes 114 of the two grooves 110 are used to respectively deliver the cooling liquid to the other inner flow channel 150. In which the distance between the two return openings 114 in the radial direction R1, R2 of one generator 12 or one motor 11 is greater than the distance between the stator of one motor 11 and the stator of one generator 12.

In the embodiment of the present application, the inner groove wall of each groove 110 further includes a liquid return hole 114, and the two liquid return holes 114 of the two grooves 110 are used for respectively delivering the cooling liquid to the other inner flow channel 150, one groove 110a is used for fixing the stator of one electric motor 11, and the other groove 110b is used for fixing the stator of one electric generator 12, so that the cooling liquid for cooling the stator of one electric generator 12 and the stator of one electric motor 11 can be recovered and recycled, which is beneficial to reducing the requirement of the cooling liquid. Wherein the other internal flow passage 150 includes a flow passage between the two return holes 114 to the inlet of one oil pump tank 120, and the other internal flow passage 150 includes a space portion in the decelerator accommodating chamber 500.

In the embodiment of the present application, as shown in fig. 5, the distance between the two liquid return holes 114 along the radial direction R1, R2 of one generator 12 or one motor 11 is denoted as L9, the distance between the stator of one motor 11 and the stator of one generator 12 is denoted as L10, and L9 > L10, that is, the two liquid return holes 114 may be respectively disposed below the two grooves 110 near the stator of one motor 11 and the stator of one generator 12, which is beneficial for the cooling liquid in the two grooves 110 to flow back from the two liquid return holes 114 to the other internal flow channel 150 under the action of gravity, thereby being beneficial for reducing the power loss and realizing the recycling of the cooling liquid.

In the embodiment of the present application, the cooling liquid in the oil pump tank 120 flows through one inner flow channel 140, two liquid return holes 114 of two grooves 110, and the other inner flow channel 150 in sequence, and then flows back to one oil pump tank 120 to form a circulation.

In one embodiment, as shown in fig. 4 and 5, two liquid return holes 114 penetrate through the integrated housing 100 along the axial direction O of one generator 12 or one motor 11, respectively, and the aperture of each liquid return hole 114 is larger than the aperture of each stator liquid outlet hole 113.

In the embodiment of the present application, the aperture of each liquid return hole 114 is larger than the aperture of each stator liquid outlet hole 113, so that it is beneficial to flow as much cooling liquid for cooling the stator of one generator 12 or the stator of one motor 11 in two grooves 110 as possible out of the two liquid return holes 114, to avoid accumulation of oil in the two grooves 110, and to improve the cooling efficiency of the dual-motor power assembly 10.

Referring to fig. 3, 8, 9 and 10, fig. 8 is a cross-sectional view of the integrated housing 100 along AA in fig. 3, fig. 9 is a cross-sectional view of the integrated housing 100 along BB in fig. 3, and fig. 10 is a cross-sectional view of the integrated housing 100 along CC in fig. 3. In one embodiment, one integrated housing 100 further includes one main oil hole 101 and two sub oil holes 102, one main oil hole 101 for communicating the two sub oil holes 102 through one inner flow passage 140, and one main oil hole 101 and each sub oil hole 102 are opened for receiving a blocking member. As shown in fig. 5, a main oil hole 101 and two sub oil holes 102 are arranged on both sides of the two grooves 110, respectively, in the radial directions R1, R2 of one generator 12 or one motor 11.

In the embodiment of the present application, an integrated housing 100 further includes a main oil hole 101 and two secondary oil holes 102, where the main oil hole 101 is configured to receive a cooling fluid from another internal flow channel 150 and input the cooling fluid into one internal flow channel 140, and the two secondary oil holes 102 form two parallel oil paths, so that the cooling fluid is split, the flow resistance of the cooling fluid is reduced, the pumping capacity of the oil pump 15 is improved, and the cooling efficiency of the dual-motor power assembly 10 is improved.

In the embodiment of the present application, one main oil hole 101 is used for communicating two sub oil holes 102 through one internal flow channel 140, the opening of one main oil hole 101 and the opening of each sub oil hole 102 are used for accommodating a plugging member, the opening of one main oil hole 101 facilitates the processing of one main oil hole 101 from the outside of the integrated housing 100 to the inside, and the opening of each sub oil hole 102 facilitates the processing of each sub oil hole 102 from the outside of the integrated housing 100 to the inside. In one implementation, the opening of the main oil hole 101 and the main oil channel 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 separately machined, which is beneficial to saving procedures and reducing machining and manufacturing difficulty of the main oil hole 101. The blocking member is located in an opening of one of the main oil holes 101 to block one of the main oil holes 101, thereby preventing oil in one of the main oil holes 101 from leaking from one of the main oil holes 101.

In one embodiment, the opening of each secondary oil hole 102 and the runner communicated with each secondary oil hole 102 are integrally die-cast, so that the opening of each secondary oil hole 102 and the runner communicated with each secondary oil hole 102 do not need to be separately processed, which is beneficial to saving working procedures and reducing the processing and manufacturing difficulty of each secondary oil hole 102. The blocking piece is located in the opening of each secondary oil hole 102 to block each secondary oil hole 102, so as to prevent oil in each secondary oil hole 102 from leaking from each secondary oil hole 102.

In the embodiment of the present application, as shown in fig. 5, along the radial directions R1 and R2 of a generator 12 or a motor 11, a main oil hole 101 and two sub oil holes 102 are respectively arranged on two sides of two grooves 110, and a main oil hole 101 is arranged in the middle of the side of the two grooves 110 close to each other, which is beneficial to the processing and manufacturing of the main oil hole 101 without adversely affecting the two grooves 110, and is beneficial to cooling and lubrication of the two gear sets 115 and the bearing by spraying the cooling liquid in a short path to the two gear sets 115 through a gear liquid outlet 104, a bearing liquid outlet 105, an oil nozzle 194, etc. after the cooling liquid pumped by an oil pump 15 from the main oil hole 101 is input into an internal flow channel 140. The two secondary oil holes 102 are arranged at two sides of the two grooves 110, so that arrangement of pipelines of the two secondary oil holes 102 is facilitated, the two secondary oil holes 102 are also facilitated to convey cooling liquid in one inner runner 140 to the two grooves 110 from the high positions of the outer sides of the two grooves 110 respectively, cooling of a stator of one generator 12 and a stator of one motor 11 is facilitated, spraying and cooling area of the cooling liquid are increased, cooling effect of the double-motor power assembly 10 is improved, and the cooling liquid is also facilitated to be input into the two grooves 110 along the gravity direction, so that power loss is reduced.

In one embodiment, one main oil hole 101 is used to form one main oil passage 141 of one inner flow passage 140 (as shown in fig. 8), and two sub oil holes 102 are used to form two sub oil passages 142 of one inner flow passage 140 (as shown in fig. 9 and 10).

In the embodiment of the present application, the cooling liquid in one internal flow channel 140 flows into one main oil channel 141 from one main oil hole 101, and flows into a plurality of gear liquid outlet holes 104 (as shown in fig. 3) in one main oil channel 141, so as to cool and lubricate a plurality of gears of two gear sets 115, and flows into one oil nozzle 194 to flow out, so as to lubricate a plurality of gears. The cooling liquid in the main oil path 141 can flow into the two secondary oil paths 142, and the cooling liquid flows into the two stator liquid outlet holes 113 of the two grooves 110 in the two secondary oil paths 142 respectively to cool the stator of the generator 12 and the stator of the motor 11, so that the cooling of the stator of the generator 12 and the stator of the motor 11 is performed synchronously in parallel, which is beneficial to reducing the flow resistance of the cooling liquid and improving the cooling efficiency.

In one embodiment, as shown in fig. 6, a gear outlet 104a for fixing a fuel injector 194 is located in a main oil path 141, which is advantageous for communication between the fuel injector 194 and the main oil path 141, so that the fuel injector 194 has a large injection pressure and a large amount of cooling liquid, which is advantageous for improving the cooling and lubrication effects of the fuel injector 194 on gears of a gear set 115 a.

In one embodiment, as shown in fig. 8 and 9, the opening orientation of one main oil hole 101 is opposite to the opening orientation of one sub oil hole 102a of the two sub oil holes 102, and as shown in fig. 8 and 10, the opening orientation of the other sub oil hole 102b of the two sub oil holes 102 intersects with the opening orientation of one main oil hole 101. As shown in fig. 5, the distance between one main oil hole 101 and either one of the two sub oil holes 102 is greater than the inner diameter of each groove 110. The distance between one main oil hole 101 and one sub oil hole 102a is larger than the distance between one main oil hole 101 and one stator liquid outlet hole 113a of one groove 110 a. The distance between one main oil hole 101 and the other sub oil hole 102b is larger than the distance between one main oil hole 101 and one stator liquid outlet hole 113b of the other groove 110 b.

In the embodiment of the present application, the opening of one main oil hole 101 faces away from the opening of one sub oil hole 102a of two sub oil holes 102, so that the integrated housing 100 can process a part of one inner flow channel 140 from two opposite directions, which is beneficial to shortening the drawing path, reducing the drawing difficulty and improving the reliability of the integrated housing 100. The opening direction of the other secondary oil hole 102b of the two secondary oil holes 102 is intersected with the opening direction of the main oil hole 101, that is, the opening direction of the one secondary oil hole 102a is intersected with the opening direction of the one secondary oil hole 102a, so that after the cooling liquid in the one inner flow passage 140 flows through the main oil hole 101, the cooling liquid can be split in the process of flowing into the two secondary oil holes 102, the flowing resistance of the cooling liquid in the one inner flow passage 140 is reduced, the power loss is reduced, the parallel cooling of the cooling liquid to the stator of the generator 12 and the stator of the motor 11 is realized, the flowing path of the cooling liquid is shortened, and the cooling efficiency is improved. Further, the opening orientation of one main oil hole 101 is opposite to the opening orientation of one sub oil hole 102a of the two sub oil holes 102, and the opening orientation of the other sub oil hole 102b of the two sub oil holes 102 intersects with the opening orientation of one main oil hole 101. The processing of one main oil hole 101 and two secondary oil holes 102 from different directions of the integrated housing 100 is facilitated, the overall structural strength of the integrated housing 100 is guaranteed, and the overall structural strength of the integrated housing 100 is not reduced due to the fact that the strength of a part of the integrated housing 100 is lower.

In the embodiment of the present application, as shown in fig. 3 and 5, the distance between one main oil hole 101 and one sub oil hole 102a is denoted as L11, the distance between one main oil hole 101 and the other sub oil hole 102b is denoted as L12, the inner diameter of one groove 110a is denoted as L13, the inner diameter of the other groove 110b is denoted as L14, L11 > L13, L11 > L14, L12 > L13, L12 > L14, it is advantageous for one main oil hole 101 and two sub oil holes 102 to be arranged on both sides of two grooves 110, respectively, one main oil hole 101 to be arranged in the middle of the side where the two grooves 110 are close to each other, so that the machining and casting of one main oil hole 101 is not adversely affected on the two grooves 110, and it is advantageous for cooling liquid to be sprayed to the two gear sets 115 and the bearing through the gear liquid outlet 104, the bearing liquid outlet 105, the oil nozzle 194 (as shown in fig. 6) and the like after being input into one inner flow passage 140. The two secondary oil holes 102 are arranged at two sides of the two grooves 110, which is favorable for arranging pipelines of the two secondary oil holes 102, and is favorable for conveying cooling liquid in one inner runner 140 to the two grooves 110 from the outer sides of the two grooves 110 by the two secondary oil holes 102 respectively so as to cool down a stator of one generator 12 and a stator of one motor 11, thereby being favorable for increasing spraying and cooling areas of the cooling liquid and improving the cooling effect of the double-motor power assembly 10.

In the embodiment of the present application, the distance between the main oil hole 101 and the secondary oil hole 102a is L11, the distance between the main oil hole 101 and the stator liquid outlet 113a of the groove 110a is L15, L11 > L15, and L15 is smaller, which is favorable for arranging the stator liquid outlet 113a in the inner groove wall of the groove 110a, spraying the cooling liquid to the stator of the motor 11, and cooling the stator of the motor 11. L11 is large so as to facilitate the arrangement of one sub oil hole 102a outside one groove 110a, facilitate the processing of one sub oil hole 102a inward from the outside of the integrated housing 100, and not affect the structural strength of one groove 110 a.

In the embodiment of the present application, the distance between one main oil hole 101 and the other secondary oil hole 102b is L12, and the distance between one main oil hole 101 and one stator outlet hole 113b of the other groove 110b is L16, where L12 > L16, which is favorable for arranging one stator outlet hole 113b on the inner groove wall of the other groove 110b, spraying cooling liquid to the stator of one generator 12, and cooling the stator of one generator 12. L12 is large, thereby facilitating the placement of the other sub-oil hole 102b outside the other groove 110b, facilitating the processing of the other sub-oil hole 102b inward from the outside of the integrated housing 100 without affecting the structural strength of the other groove 110 b.

Referring to fig. 5, 11 and 12, fig. 11 is a partial enlarged view of a portion M3 of the integrated housing 100 in fig. 5, and fig. 12 is a cross-sectional view of an oil pump groove 120 according to an embodiment of the present application. In one embodiment, one oil pump tank 120 includes a strainer-receiving section 121 and an oil pump-receiving section 122.

In the embodiment of the present application, the strainer accommodating section 121 is for accommodating a strainer (not shown), and the oil pump accommodating section 122 is for accommodating an oil pump 15. A strainer is used to filter and remove impurities from the oil fed to an oil pump 15, which is advantageous in reducing the work load of a fine filter 17. In the embodiment of the application, the filtering capacity of the fine filter 17 to the oil is larger than that of the coarse filter to the oil, and the particle size of the impurities filtered by the fine filter 17 is smaller than that of the impurities filtered by the coarse filter.

In one embodiment, as shown in fig. 11 and 12, one oil pump tank 120 includes an oil pump tank intake port 123 and an oil pump tank discharge port 124, the oil pump tank intake port 123 being configured to communicate with another internal flow passage 150 (as shown in fig. 3), and the oil pump tank discharge port 124 being configured to communicate with one internal flow passage 140 (as shown in fig. 3).

In the embodiment of the present application, the liquid inlet 123 of the oil pump tank is used for inputting the cooling liquid in the other internal flow channel 150 (as shown in fig. 3) into the oil pump tank 120, after the oil pump tank 120 is coarsely filtered by a coarse filter, the cooling liquid reaches an oil pump 15, and the cooling liquid is pumped into an internal flow channel 140 by pumping the cooling liquid into the oil pump tank liquid outlet 124 of the oil pump 15, and is cooled and lubricated by the stator of the generator 12 and the stator of the motor 11 through the internal flow channel 140, and is cooled and lubricated by the two gear sets 115 and the bearings.

In one embodiment, as shown in fig. 11 and 12, the oil path between the two return holes 114 of the two grooves 110 and the oil pump tank inlet hole 123 forms another internal flow path 150 (as shown in fig. 3) of the integrated housing 100.

In one embodiment, the integrated housing 100 further includes a heat exchange fluid inlet 103a and a heat exchange fluid outlet 103b, as shown in fig. 11 and 12, the heat exchange fluid inlet 103a is configured to communicate with the oil pump sump fluid outlet 124, and the heat exchange fluid outlet 103b is configured to communicate with an internal flow passage 140 (as shown in fig. 5).

In the embodiment of the present application, the heat exchange liquid inlet 103a is used for inputting the cooling liquid input by the liquid outlet 124 of the oil pump tank into the heat exchanger for heat exchange, so that the cooling liquid heated in one internal flow channel 140 conveyed by the other internal flow channel 150 is cooled, and then the cooling liquid is input into one internal flow channel 140 through the heat exchange liquid outlet 103b, thereby realizing the recycling of the cooling liquid, and being beneficial to the cooling liquid in one internal flow channel 140 being always at a lower temperature, thereby being beneficial to improving the heat dissipation efficiency of the dual-motor power assembly 10 and improving the performance of the dual-motor power assembly 10.

In one embodiment, the integrated housing 100 further includes a fine filter tank 130, as shown in fig. 8 and 11, one fine filter tank 130 for receiving one fine filter 17, one fine filter tank 130 including a fine filter inlet 131 and a fine filter outlet 132, the fine filter inlet 131 for communicating with the heat exchange outlet 103b, and the fine filter outlet 132 for communicating with one internal flow passage 140. In fig. 11, a fine filter 17 is a schematic position of the fine filter 17.

In the embodiment of the present application, a fine filter 17 filters and decontaminates part of the cooling liquid cooled by the heat exchanger to obtain high-cleanliness cooling liquid, and the cooling liquid is sent to two grooves 110 for cooling the stator of a generator 12 and the stator of a motor 11.

In one embodiment, as shown in fig. 8 and 11, a part of the cooling liquid output from the heat exchange liquid outlet 103b is output to the fine filtration liquid inlet 131, filtered and filtered in the fine filter 17 to remove impurities, and another part of the cooling liquid is directly output to an internal flow channel 140, that is, a bypass structure is added to the fine filter 17, which is beneficial to reducing the flow resistance of the system and improving the pumping capacity of the oil pump 15, and a part of the cooling liquid is filtered and filtered to remove impurities and is beneficial to improving the cleanliness of the oil cooling system.

Referring to fig. 4, fig. 6, fig. 13 and fig. 14, fig. 13 is a schematic structural diagram of a cover plate 200 according to an embodiment of the present application, and fig. 14 is a schematic structural diagram of another cover plate 200 according to an embodiment of the present application.

In one embodiment, one integrated housing 100 includes two mounting surfaces 170, as shown in fig. 4, the two mounting surfaces 170 are opposite in the axial direction O of one generator 12 or one motor 11, each mounting surface 170 is for fixing one cover plate 200, and at least one mounting surface 170 includes two oil holes 170c, the two oil holes 170c are for communicating one inner flow passage 140 and an inner oil passage of one cover plate 200. Wherein the openings of the two oil holes 170c are directed toward one cover plate 200 in the axial direction O of one motor 11 or one generator 12.

In the embodiment of the present application, each mounting surface 170 is used for fixedly connecting with one cover plate 200, and each mounting surface 170 may be a plane or a concave-convex surface, so long as each mounting surface 170 is ensured to be capable of being fixed with one cover plate 200. Illustratively, one mounting face 170 of the integrated housing 100 and one mounting face of the cover plate 200 are planar. Illustratively, one mounting face 170 of the integrated housing 100 is in a male-female fit with the mounting face of one cover plate 200.

In the embodiment of the present application, the at least one mounting surface 170 includes two oil holes 170c, and the two oil holes 170c are used for communicating an internal flow channel 140 and an internal oil channel of a cover plate 200, so that a cooling liquid in the internal flow channel 140 of an integrated housing 100 can flow into the internal oil channel of the cover plate 200, so that an internal part liquid close to the cover plate 200 can be lubricated, cooled, and cooled, which is beneficial to more complete cooling and lubrication pipelines in the dual-motor power assembly 10, and is beneficial to improving cooling and lubrication efficiency of the dual-motor power assembly 10.

In the embodiment of the present application, the internal oil passage of one cover plate 200 is die-cast in one cover plate 200, which is beneficial to reducing the arrangement of pipelines outside one cover plate 200, reducing the overall volume of the dual-motor power assembly 10, saving die-cast materials and reducing production cost.

In the embodiment of the present application, the openings of the two oil holes 170c are oriented toward one cover plate 200 in the axial direction O of one motor 11 or one generator 12, thereby facilitating a smoother flow of the coolant in the two oil holes 170c into the internal oil passage of one cover plate 200.

In one embodiment, an integrated housing 100 further includes a mounting surface 170a, as shown in fig. 4 and 13, one mounting surface 170a is used for fixing a motor cover plate 300, the motor cover plate 300 is used for enclosing two motor accommodating cavities 600 with two grooves 110, the two motor accommodating cavities 600 are respectively used for accommodating a stator of a generator 12 and a stator of a motor 11, one mounting surface 170a includes two first oil holes 171, and each first oil hole 171 is used for communicating with one stator outlet hole 113 and an internal oil duct of the motor cover plate 300. Wherein openings of the two first oil holes 171 are directed toward the motor cover 300 in the axial direction O of one motor 11 or one generator 12.

In the embodiment of the present application, one mounting surface 170a is used for mounting and fixing the motor cover plate 300, so that two motor accommodating cavities 600 are formed by the motor cover plate 300 and the two grooves 110, and the two motor accommodating cavities 600 are respectively used for accommodating the stator of one generator 12 and the stator of one motor 11, so that the stator of one generator 12 and the stator of one motor 11 can not be interfered by external environments, and the cooling liquid flowing into the two grooves 110 from the two stator liquid outlet holes 113 can not flow out of the two motor accommodating cavities 600 from the parts except the liquid return holes 114 (shown in fig. 5), thereby causing leakage of the cooling liquid.

In the embodiment of the present application, one installation surface 170a includes two first oil holes 171, and each first oil hole 171 is used for communicating with one stator outlet hole 113 and for communicating with an internal oil passage of the motor cover plate 300, so that the cooling liquid flowing into one groove 110 from one stator outlet hole 113 and the internal oil passage flowing into the motor cover plate 300 from each first oil hole 171 can be connected in parallel. The cooling liquid in one inner runner 140 is also facilitated to be input into the inner oil duct of the motor cover plate 300 through the two first oil holes 171, so that the inner parts close to the motor cover plate 300 can be lubricated, cooled down, the cooling lubrication pipeline in the double-motor power assembly 10 is more complete, and the cooling and lubricating efficiency of the double-motor power assembly 10 is improved.

In the embodiment of the present application, the openings of the two first oil holes 171 are oriented toward the motor cover 300 in the axial direction O of one motor 11 or one generator 12, so that the coolant in the two first oil holes 171 can flow into the internal oil passage of the motor cover 300 more smoothly.

In one embodiment, the motor cover 300 includes one motor cover mounting surface 310, and as shown in fig. 4 and 13, one motor cover mounting surface 310 is used to fix one mounting surface 170a, and one motor cover mounting surface 310 includes two motor oil holes 301, and the two motor oil holes 301 are used to communicate with the two first oil holes 171 and to communicate with the internal oil passage of the motor cover 300, respectively. Wherein the openings of the two motor oil holes 301 are directed toward one integrated housing 100 in the axial direction O of one motor 11 or one generator 12. Two motor oil holes 301 are aligned with two first oil holes 171, respectively, in the axial direction O of one motor 11 or one generator 12.

In the embodiment of the present application, one motor cover plate mounting surface 310 is fixedly connected to one mounting surface 170a, and one motor cover plate mounting surface 310 and one mounting surface 170a may be flat or concave-convex surfaces, so long as it is ensured that one motor cover plate mounting surface 310 can be fixed to one mounting surface 170 a. Illustratively, one motor cover mounting surface 310 and one mounting surface 170a are planar. Illustratively, one motor cover mounting surface 310 is in a male-female fit with one mounting surface 170 a.

In the embodiment of the present application, one motor cover plate mounting surface 310 includes two motor oil holes 301, and the two motor oil holes 301 are respectively used for communicating with the two first oil holes 171 and for communicating with the internal oil passage of the motor cover plate 300, and the two motor oil holes 301 facilitate the coolant in one internal flow passage 140 of the integrated housing 100 to flow into the internal oil passage of the motor cover plate 300 from the two first oil holes 171 and the two motor oil holes 301.

In the embodiment of the present application, the openings of the two motor oil holes 301 in the axial direction O of one motor 11 or one generator 12 are directed toward one integrated housing 100, which is advantageous in that the two motor oil holes 301 receive the cooling liquid from the two first oil holes 171 of one integrated housing 100 more smoothly.

In the embodiment of the present application, the two motor oil holes 301 are aligned with the two first oil holes 171 along the axial direction O of one motor 11 or one generator 12, respectively, so that the two first oil holes 171 are beneficial to flow the cooling liquid in one inner flow passage 140 into the inner oil passage of the motor cover plate 300 in a shorter path and at a higher speed.

In one embodiment, the two first oil holes 171 and the two motor oil holes 301 are sealed by sealing rings, so that oil leakage is avoided.

In one embodiment, one mounting surface 170a includes a plurality of fixing holes 302, as shown in fig. 4 and 13, the plurality of fixing holes 302 are used to fix the motor cover 300. Wherein a plurality of fixing holes 302 along the radial directions R1, R2 of one motor 11 or one generator 12 are surrounded on the outer circumferences of the two grooves 110. A first oil hole 171a is provided for communicating with one groove 110a, and a first oil hole 171a is arranged between one groove 110a and a plurality of fixing holes 302 in the radial direction R1 of one motor 11.

In the embodiment of the present application, one mounting surface 170a includes a plurality of fixing holes 302, which facilitates fixing the one mounting surface 170a to the motor cover 300 by screws in the plurality of fixing holes 302. The plurality of fixing holes 302 of the motor cover plate 300 along the radial direction R1 and R2 of the motor 11 or the generator 12 encircle the periphery of the two grooves 110, which is favorable for fixedly connecting the mounting surface 170a and the motor cover plate mounting surface 310 from the periphery of the two grooves 110 by a plurality of screws passing through the plurality of fixing holes 302, i.e. fixedly connecting the periphery of the integrated housing 100 and the periphery of the motor cover plate 300, and is favorable for more firm and stable fixation.

In the embodiment of the present application, a first oil hole 171a is used to communicate with a groove 110a, so that it is advantageous for an internal flow channel 140 to flow into a groove 110a for supplying the cooling liquid for the stator of a motor 11 and the cooling liquid flowing into the internal oil channel of the motor cover 300 to be in a parallel connection, so that it is advantageous for reducing the flow resistance and improving the cooling efficiency. A first oil hole 171a is arranged between one groove 110a and a plurality of fixing holes 302 along the radial direction R1 of one motor 11, that is, a pipe communicating with one first oil hole 171a is arranged inside the integrated housing 100, which is advantageous for fully utilizing the space inside the integrated housing 100, while occupying too much space outside the integrated housing 100, which is advantageous for reducing the overall volume of the dual-motor power assembly 10, and for miniaturized arrangement of the dual-motor power assembly 10.

In one embodiment, one integrated housing 100 further includes another mounting face 170b, as shown in fig. 3, 6 and 14, the other mounting face 170b for securing one end face 410 of the retarder cover plate 400, the other end face 420 of the retarder cover plate 400 for securing one engine 16 (as shown in fig. 2), one engine 16 for driving connection of one generator 12 through one gear set 115a, and the other mounting face 170b includes two second oil holes 172, as shown in fig. 6, each second oil hole 172 for communicating with one of the internal flow passages 140 and with an internal oil passage of the retarder cover plate 400. Wherein the openings of the two second oil holes 172 face away from the two grooves 110 in the axial direction O of one motor 11 or one generator 12.

In the embodiment of the present application, the other mounting surface 170b is used to fix one end surface 410 of the cover plate 400 of the speed reducer, so that the other mounting surface 170b of the integrated housing 100 and the cover plate 400 of the speed reducer form a speed reducer accommodating cavity 500, and the speed reducer accommodating cavity 500 is used to accommodate the two gear sets 115.

In the embodiment of the present application, the other installation surface 170b includes two second oil holes 172, and each second oil hole 172 is used for communicating with one of the inner flow passages 140 and the inner oil passage of the decelerator cover 400, so that it is advantageous to flow the cooling liquid in one of the inner flow passages 140 out of one of the integrated housings 100 from the two second oil holes 172 and into the inner oil passage of the decelerator cover 400.

In the embodiment of the present application, the openings of the two second oil holes 172 in the axial direction O of one motor 11 or one generator 12 face away from the two grooves 110, that is, the openings of the two second oil holes 172 in the axial direction O of one motor 11 or one generator 12 face toward the retarder cover plate 400, thereby facilitating the coolant in the two second oil holes 172 to flow into the internal oil passages of the retarder cover plate 400 more smoothly.

In one embodiment, the decelerator cover 400 includes one decelerator cover mounting surface 470, as shown in fig. 3, 6 and 14, one decelerator cover mounting surface 470 for fixing the other mounting surface 170b, and one decelerator cover mounting surface 470 includes two decelerator oil holes 401 for communicating with the two second oil holes 172 and for communicating with the internal oil passages of the decelerator cover 400, respectively. Wherein the openings of the two speed reducer oil holes 401 are directed toward one integrated housing 100 in the axial direction O of one motor 11 or one generator 12. One of the speed reducer oil holes 401a is aligned with one of the second oil holes 172a in the axial direction O of one of the electric motors 11 or one of the generators 12, and the other speed reducer oil hole 401b is offset from the other second oil hole 172 b.

In the embodiment of the present application, one of the decelerator cover plate mounting surfaces 470 is used to fix the other mounting surface 170b, and one of the decelerator cover plate mounting surfaces 470 and the other mounting surface 170b may be a plane or a concave-convex surface, so long as it is ensured that one of the decelerator cover plate mounting surfaces 470 can be fixed with the other mounting surface 170 b. Illustratively, one of the reducer cover mounting surfaces 470 and the other mounting surface 170b are planar. Illustratively, one of the reducer cover mounting surfaces 470 is in a male-female engagement with the other mounting surface 170 b.

In the embodiment of the present application, the one reducer cover mounting surface 470 includes two reducer oil holes 401, where the two reducer oil holes 401 are respectively used to communicate with the two second oil holes 172 and to communicate with the internal oil passage of the reducer cover 400, and the two reducer oil holes 401 facilitate the coolant in the one internal flow passage 140 of the integrated housing 100 to flow into the internal oil passage of the reducer cover 400 from the two second oil holes 172 and the two reducer oil holes 401.

In the embodiment of the present application, the alignment of one of the speed reducer oil holes 401a with one of the second oil holes 172a along the axial direction O of one of the electric motors 11 or one of the electric generators 12 facilitates a shorter path, faster flow of the coolant in one of the internal flow passages 140 into the internal oil passage of the speed reducer cover 400 by one of the second oil holes 172 a. The other speed reducer oil hole 401b is offset from the other second oil hole 172b, so that the other second oil hole 172b may be disposed on one of the secondary oil passages 142, and the other second oil hole 172b may be disposed closer to one of the drive shaft chambers 181a, facilitating lubrication and cooling of the bearings in one of the drive shaft chambers 181a by the coolant flowing out of one of the internal flow passages 140.

In one embodiment, the two second oil holes 172 and the two speed reducer oil holes 401 are sealed by sealing rings, so that oil leakage is avoided.

In one embodiment, the other mounting surface 170b and one of the reducer cover mounting surfaces 470 are surrounded to form one of the reducer guide passages 430, as shown in fig. 6 and 14, and the cooling fluid in one of the internal passages 140 flows through the other of the second oil holes 172b on the other mounting surface 170b, through one of the reducer guide passages 430, into the other one of the reducer oil holes 401b of the one of the reducer cover mounting surfaces 470, and further into the internal oil passages of the reducer cover 400, as shown in fig. 3, for cooling lubrication of the bearings in one of the drive shaft chamber 181a, one of the intermediate shaft chambers 182a, and one of the output shaft chambers 183.

In the embodiment of the present application, the other speed reducer oil hole 401b is offset from the other second oil hole 172b along the axial direction O of the one electric motor 11 or the one electric generator 12, and the coolant in the other second oil hole 172b flows into the other speed reducer oil hole 401b, so that one speed reducer guide passage 430 is required to communicate, which is beneficial for the coolant in the one internal passage 140 to smoothly flow out of the other second oil hole 172b and flow into the internal passage of the speed reducer cover plate 400 from the other speed reducer oil hole 401 b.

In one embodiment, as shown in fig. 6 and 14, the decelerator cover 400 includes two transmission shaft bearing grooves 440, the two transmission shaft bearing grooves 440 are respectively used to fix outer rings of bearings of the two transmission shafts 191, and the two transmission shafts 191 are respectively used to drivingly connect a rotor of one generator 12 and a rotor of one motor 11. Wherein, the groove bottom of each transmission shaft bearing groove 440 includes one transmission shaft oil hole 406, and each transmission shaft oil hole 406 is used for communicating with one reducer oil hole 401 through the internal oil passage of the reducer cover 400. Each of the drive shaft oil holes 406 is opened toward one of the integrated housings 100 in the axial direction O of one of the electric motors 11 or one of the electric generators 12, and each of the drive shaft oil holes 406 is for communicating with one of the grooves 110 through one of the drive shafts 191.

In the embodiment of the present application, the bottom of each transmission shaft bearing groove 440 includes a transmission shaft oil hole 406, each transmission shaft oil hole 406 is used for communicating with one speed reducer oil hole 401 through the internal oil passage of the speed reducer cover plate 400, and one transmission shaft oil hole 406 can sequentially communicate with the inner cavities of the transmission shaft 191 and the motor shaft, and convey the cooling liquid to the two grooves 110 or the rotor of one generator 12 and the rotor of one motor 11 for cooling.

In the embodiment of the present application, the opening of each of the drive shaft oil holes 406 is directed toward one of the integrated housings 100 in the axial direction O of one of the electric motors 11 or one of the electric generators 12, and the bearing arrangement liquid of each of the drive shafts 191 is directed toward one of the integrated housings 100, thereby facilitating the spraying of the cooling liquid toward one of the integrated housings 100 by each of the drive shaft oil holes 406, and thereby facilitating the cooling lubrication of the bearings of both of the drive shafts 191 by the cooling liquid. Each transmission shaft oil hole 406 is used for communicating one groove 110 through one transmission shaft 191, so that a bearing of one transmission shaft 191 can not only receive cooling lubrication of one transmission shaft oil hole 406, but also receive cooling lubrication of cooling liquid flowing in one groove 110 from one stator liquid outlet 113, which is beneficial to improving cooling and lubrication efficiency of the cooling liquid to the bearing and improving performance of the double-motor power assembly 10.

In one embodiment, the peripheral wall of each driving shaft bearing groove 440 includes a bearing groove liquid inlet 403, each bearing groove liquid inlet 403 is used for communicating with one speed reducer oil hole 401 through an internal oil channel of the speed reducer cover plate 400, and the cooling liquid flows through one internal flow channel 140, one second oil hole 172a, one speed reducer oil hole 401a, one bearing groove liquid inlet 403a, flows into one driving shaft bearing groove 440a, cools and lubricates the bearing of the other driving shaft 191b, and flows through one internal flow channel 140, the other second oil hole 172b, the other speed reducer oil hole 401b, the other bearing groove liquid inlet 403b, flows into the other driving shaft bearing groove 440b, and cools and lubricates the bearing of the one driving shaft 191 a.

In one embodiment, as shown in fig. 6 and 14, the decelerator cover 400 further includes two intermediate shaft bearing grooves 450 for fixing outer rings of bearings of the two intermediate shafts 192, respectively, and two first bearing groove communication holes 404 for communicating the two transmission shaft bearing grooves 440 and the two intermediate shaft bearing grooves 450, respectively.

In the embodiment of the present application, the two first bearing groove communicating holes 404 can cool and lubricate the bearings of the two intermediate shafts 192 by flowing the cooling liquid flowing into the two transmission shaft bearing grooves 440 from the two transmission shaft oil holes 406 into the two intermediate shaft bearing grooves 450, which is beneficial to improving the cooling and lubricating efficiency of the dual-motor power assembly 10. The middle shaft bearing groove 450 and the transmission shaft bearing groove 440 are communicated in a punching way, so that the recycling of the cooling liquid is realized, and the cooling liquid demand is reduced.

In one embodiment, as shown in fig. 6 and 14, the cover plate 400 further includes an output shaft bearing groove 460 and a second bearing groove communication hole 405, one output shaft bearing groove 460 for fixing an outer ring of a bearing of an output shaft 184 (as shown in fig. 7), and one second bearing groove communication hole 405 for communicating one output shaft bearing groove 460 and one intermediate shaft bearing groove 450a. So that the cooling fluid flowing in from one of the transmission shaft oil holes 406b can flow into one of the output shaft bearing grooves 460 from one of the transmission shaft bearing grooves 440b, one of the first bearing groove communication holes 404a, one of the intermediate shaft bearing grooves 450a, one of the second bearing groove communication holes 405a in order, to cool and lubricate the bearing of one of the output shafts 184, thereby facilitating the improvement of the cooling and lubrication efficiency of the dual-motor power assembly 10. The middle shaft bearing groove 450 and the output shaft bearing groove 460 are communicated in a punching way, so that the recycling of the cooling liquid is realized, and the cooling liquid demand is reduced.

The above describes the dual-motor power assembly and the vehicle with the integrated flow channel of the housing provided by the embodiment of the application in detail, and specific examples are applied to the description of the principle and the embodiment of the application, and the description of the above embodiment is only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will have variations in specific embodiments and application scope in light of the ideas of the present application, the present description should not be construed as limiting the present application.

Claims

1. A dual-motor powertrain with integrated flow passages in a housing, characterized in that the dual-motor powertrain comprises an electric motor, a generator and an integrated housing formed by die-casting, wherein the integrated housing comprises:

an internal flow channel, the internal flow channel being used to transmit a cooling fluid;

Two grooves, 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 groove wall of each groove includes a stator liquid outlet hole, and each stator liquid outlet hole is used to connect to the internal flow channel to receive coolant.

2. The dual-motor powertrain according to claim 1, characterized in that each of the grooves comprises an axial groove bottom and a circumferential groove wall, wherein:

Along the radial direction of the motor, one of the stator liquid outlet holes penetrates the circumferential groove wall of the groove;

Along the radial direction of the one generator, the other stator liquid outlet hole penetrates the circumferential groove wall of the other groove.

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

4. The dual-motor powertrain according to any one of claims 1 to 3, characterized in that the dual-motor powertrain comprises two gear sets, the one motor is used for transmission connection to one of the gear sets, the one generator is used for transmission connection to the other gear set, the one integrated housing comprises two side surfaces, and the two side surfaces are opposite to each other along the axial direction of the one motor or the one generator, wherein:

One of the side surfaces comprises the two grooves, and the two grooves are arranged at intervals along the radial direction of the motor or the generator;

The other side surface is used to accommodate multiple gears of the two gear sets, and the other side surface includes one or more gear outlet holes, each of which is used to connect to the one internal flow channel to receive coolant.

5. The dual-motor powertrain according to claim 4, characterized in that the dual-motor powertrain comprises two transmission shafts, the one integrated housing comprises two transmission shaft cavities, and the two transmission shaft cavities respectively penetrate the one integrated housing along the axial direction of the one motor or the one generator, wherein:

A transmission shaft cavity is used to fix the outer ring of a bearing of a transmission shaft, and the transmission shaft is used to drive and connect one of the gears in the gear set and the rotor of the motor;

Another transmission shaft cavity is used to fix the outer ring of the bearing of another transmission shaft, and another transmission shaft is used to transmission-connect one of the gears in another gear set and the rotor of the generator;

The inner peripheral wall of each transmission shaft cavity comprises a bearing liquid outlet hole, and the bearing liquid outlet holes of the two transmission shaft cavities are respectively used to connect to the one internal flow channel to receive the coolant.

6. The dual-motor powertrain according to claim 5, characterized in that, along the arrangement direction of the two transmission shaft cavities, the opening of the one bearing liquid outlet hole on the inner peripheral wall of the one transmission shaft cavity faces away from the other transmission shaft cavity;

The distance between the two transmission shaft cavities is smaller than the distance between the bearing fluid outlet holes of the two transmission shaft cavities.

7. The dual-motor powertrain according to claim 5, characterized in that one of the gear liquid outlet holes is used to fix one oil spray nozzle, and the distance between the one gear liquid outlet hole and each of the transmission shaft cavities is smaller than the distance between the two transmission shaft cavities;

The aperture of the liquid outlet hole of one gear is larger than the apertures of the liquid outlet holes of the other gears.

8. The dual-motor powertrain according to claim 5, characterized in that the dual-motor powertrain comprises two intermediate shafts, the one integrated housing comprises two intermediate shaft cavities, and the two intermediate shaft cavities respectively penetrate the one integrated housing along the axial direction of the one motor or the one generator, wherein:

One of the intermediate shaft chambers is used to fix the outer ring of a bearing of the intermediate shaft, and the intermediate shaft is used to drive and connect the transmission shaft and a large plate gear;

Another intermediate shaft cavity is used to fix the outer ring of the bearing of another intermediate shaft, and the other intermediate shaft is used to drive and connect the other transmission shaft and an engine shaft;

The other side surface also includes two oil guide ribs, each of which is used to connect to the outer circumferential wall of one of the intermediate shaft cavities, and the inner circumferential wall of each of the intermediate shaft cavities includes an opening, one of the openings is adjacent to one of the oil guide ribs, and one of the oil guide ribs is used to guide the coolant through the one opening and input into one of the intermediate shaft cavities connected thereto.

9. The dual-motor power assembly 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 of the two intermediate shaft cavities is smaller than the distance between the axes of the two intermediate shaft cavities.

10. The dual-motor powertrain according to any one of claims 1 to 9, characterized in that the integrated housing further comprises another internal flow channel and an oil pump groove, wherein:

The other internal flow channel is used to communicate with the one oil pump groove, the one oil pump groove is used to accommodate an oil pump, and the one oil pump is used to receive coolant through the other internal flow channel and to output coolant through the one internal flow channel.

11. The dual-motor powertrain according to claim 10, characterized in that the inner groove wall of each groove further comprises a liquid return hole, and the two liquid return holes of the two grooves are used to transport coolant to the other internal flow channel respectively, wherein:

Along the radial direction of the generator or the motor, the distance between the two liquid return 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 to 11, characterized in that the one integrated housing further comprises a main oil hole and two secondary oil holes, the one main oil hole is used to connect the two secondary oil holes through the one internal flow channel, the opening of the one main oil hole and the opening of each of the secondary oil holes are used to accommodate a blocking member, wherein:

Along the radial direction of the generator or the motor, the main oil hole and the two secondary oil holes are arranged on both sides of the two grooves respectively.

13. The dual-motor powertrain according to claim 12, characterized in that the opening direction of the one main oil hole is opposite to the opening direction of one of the two secondary oil holes, and the opening direction of the other of the two secondary oil holes intersects with the opening direction of the one main oil hole;

The distance between the one main oil hole and any one of the two secondary oil holes is greater than the inner diameter of each of the grooves;

The distance between the one main oil hole and the one secondary oil hole is greater than the distance between the one main oil hole and a stator liquid outlet hole of the one groove;

The distance between the one main oil hole and the other secondary oil hole is greater than the distance between the one main oil hole and a stator liquid outlet hole of the other groove.

14. The dual-motor powertrain according to any one of claims 1 to 13, characterized in that the one integrated housing comprises two mounting surfaces, the two mounting surfaces are opposite to each other along the axial direction of the one generator or the one motor, each mounting surface is used to fix a cover plate, at least one mounting surface comprises two oil holes, the two oil holes are used to connect the one internal oil passage and the internal oil passage of the one cover plate, wherein:

The openings of the two oil holes along the axial direction of the one motor or the one generator face the one cover plate.

15. A vehicle, characterized in that the vehicle comprises a frame and a dual-motor powertrain as described in any one of claims 1 to 14, the frame is used to fix the dual-motor powertrain, an electric motor in the dual-motor powertrain is used to be connected to wheels through a gear set of the dual-motor powertrain, and a generator in the dual-motor powertrain is used to be connected to an engine through another gear set of the dual-motor powertrain.