Dual-motor shell assembly and electric drive system

Abstract

The invention discloses a double-motor shell assembly and an electric drive system, and the motor shell assembly comprises a speed reducer cavity at the front end, an oil pool cavity at the bottom, a left motor cavity and a right motor cavity in the middle, a ventilation cavity and an oil return cavity between the left motor cavity and the right motor cavity, and a left rotary transformer cavity and a right rotary transformer cavity at the rear end, a cooler mounting part, a left fine filter mounting part and a right fine filter mounting part are arranged outside the oil pool cavity; independent oil ducts are arranged among the oil pump, the cooler and the fine filter on each side; oil outlets of the fine filter are respectively communicated with the corresponding motor cavity and speed reducer cavity, the speed reducer cavity is provided with an oil return structure communicated with the oil return cavity, and the oil return cavity and the motor cavity are respectively provided with an oil return structure communicated with the oil pool cavity. According to the dual-motor shell assembly and the electric drive system, the motors are lubricated and cooled in an oil cooling mode, the size is small, component integration is facilitated, and the cost is low; each motor is provided with an independent lubricating and cooling oil way, the oil ways are independent and do not influence each other, and the lubricating and cooling requirements of single motor operation can be met.

Description

Technical Field

[0001] This invention relates to the field of automotive motor technology, and more particularly to a dual-motor housing assembly and electric drive system. Background Technology

[0002] Most existing vehicle electric drive systems are single-motor systems. However, with the increasing demand for power and economy, there is a clear need for dual-motor electric drive systems because they are more powerful, have a wider power coverage, are more economical, and can meet the needs of more usage scenarios. In dual-motor electric drive systems, there are many technical solutions. For example, Chinese patent CN118651054B discloses an electric drive housing assembly and electric drive system, including a reducer housing, a motor housing, and an electronic control housing. The motor housing is a hollow cylindrical shape, and the motor housing and electronic control housing are integrated. The two motor housings are symmetrically arranged on opposite sides of the reducer housing, and the two electronic control housings are respectively arranged on the outer side of the two motor housings in the axial direction. The electronic control housing includes a cover and a housing body. The housing body is integrally formed with the motor housing, and the cover is detachably connected to the housing body. The reducer housing includes a main housing and two cover plates. One side of the cover plate is connected to the housing body, and the other side of the cover plate is connected to the main housing. The two cover plates are respectively placed on the openings on opposite sides of the main housing. The main housing has a first mounting cavity and a second mounting cavity symmetrically arranged. Although this patent achieves a flat design for the dual-motor electric drive system and reduces the space occupied in the front-rear and vertical directions of the vehicle, its series connection of the two motors makes the electric drive system assembly too long, heavy, and with low integration, making it difficult to achieve lightweighting.

[0003] For example, Chinese patent CN210174610U discloses a housing structure for a hybrid electric drive system, including a front housing of a reducer, a rear housing of a reducer, and a dual-motor rear end cover. The front and rear housings of the reducer are used to seal the reducer between them. The front and rear housings are connected by a fastener. The end face of the front housing near the engine is used to connect to the engine. The rear housing has a first and a second receiving hole with one open end, which are used to accommodate the generator and the drive motor, respectively. The openings of the first and second receiving holes are sealed by the dual-motor rear end cover. Although this prior art compresses the axial arrangement space, its cooling method requires a complex water channel structure, resulting in a larger motor structure. Furthermore, in single-motor drive mode, the entire cooling system needs to be activated, making independent cooling impossible. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a dual-motor housing assembly, aiming to solve the problems of complex cooling structures, large motor housing sizes, and inability to achieve individual cooling of a single motor in existing water-cooled motor housings.

[0005] The present invention achieves the above objectives by adopting the following technical solutions: A dual-motor housing assembly includes a motor housing, a front housing that is sealed to the front end of the motor housing, a rear housing that is sealed to the rear end of the motor housing, and an oil pan that is sealed to the bottom of the motor housing. The front end of the motor housing is provided with a front partition, and a reducer cavity for installing a reducer gear set is provided between the front partition and the front housing; the bottom of the motor housing is provided with a bottom partition, and an oil sump cavity for containing lubricating oil is provided between the bottom partition and the oil pan; the motor housing has a left motor cavity and a right motor cavity arranged side by side, and the lower walls of the left motor cavity and the right motor cavity are respectively provided with a left motor oil return groove and a right motor oil return groove that communicate with the oil sump cavity; The motor housing between the left motor cavity and the right motor cavity has an upper venting cavity and a lower oil return cavity. The venting cavity has a vent hole that penetrates the upper wall of the motor housing, and the oil return cavity has an oil return groove that penetrates the bottom partition. The bottom of the front partition also has a connecting groove that connects the reducer cavity and the oil return cavity. The rear housing is provided with a left-hand rotary converter cavity and a right-hand rotary converter cavity that are connected to the left motor cavity and the right motor cavity respectively, and the rear end is respectively sealed with an end cap; the front partition is respectively provided with a motor output hole that is connected to the left motor cavity and the right motor cavity; The bottom front end of the motor housing, outside the oil sump cavity, is provided with a cooler mounting part, a left fine filter mounting part, and a right fine filter mounting part; the side wall of the oil sump cavity is provided with a left oil pump mounting part and a right oil pump mounting part. The left oil pump mounting part is provided with a left oil pump suction port and a left oil pump outlet port; the cooler mounting part is provided with a left cooler inlet port and a left cooler outlet port; the left fine filter mounting part is provided with a left fine filter inlet port and a left fine filter outlet port; the motor housing has a left cooling oil passage connecting the left oil pump outlet port and the left cooler inlet port, a left filter oil passage connecting the left cooler outlet port and the left fine filter inlet port, a left motor oil passage connecting the left fine filter outlet port and the left motor cavity, and a left reducer oil passage connecting the left fine filter outlet port and the reducer cavity. The right oil pump mounting part is provided with a right oil pump suction port and a right oil pump outlet port; the cooler mounting part is provided with a right cooler inlet port and a right cooler outlet port; the right fine filter mounting part is provided with a right fine filter inlet port and a right fine filter outlet port; the motor housing has a right cooling oil passage connecting the right oil pump outlet port and the right cooler inlet port, a right filter oil passage connecting the right cooler outlet port and the right fine filter inlet port, a right motor oil passage connecting the right fine filter outlet port and the right motor cavity, and a right reducer oil passage connecting the right fine filter outlet port and the reducer cavity.

[0006] The working principle of this technical solution is as follows: Structurally, the reducer cavity and the motor cavity are separated by a front partition. The front partition, the side wall of the reducer cavity, and the motor housing are integrally formed. The reducer cavity and the oil sump cavity are separated by a bottom partition. The bottom partition, the side wall of the oil sump cavity, and the motor housing are integrally formed. The resolver cavity is located at the rear end of the housing assembly and is coaxial with the center line of the corresponding motor cavity. The reducer cavity is sealed by the front housing and is used to install the reducer gear set. The rear end of the motor housing is sealed by the rear housing, and the rear ends of the motor cavities are interconnected to facilitate the flow of lubricating fluid. The oil sump cavity is formed by sealing with an oil pan and is used to store lubricating oil. The resolver cavity is located between the rear housing and the motor cavity and is sealed by an end cover, which has high space utilization and is easy to disassemble and inspect. The front housing has a power output system docking surface for easy docking with the power system.

[0007] Regarding the oil circuit, after the housing assembly is assembled, the left / right oil pump draws oil from the bottom of the oil sump through the left / right oil pump suction port. The oil passes through the left / right oil pump, enters the left / right cooler through the left / right cooling oil passage, and then enters the left / right filter oil passage through the left / right cooler outlet port, thus entering the left / right fine filter. After flowing out from the left / right fine filter outlet port, it splits into two paths. One path enters the left / right motor cavity through the left / right motor oil passage for lubrication and cooling of the left / right motor. The other path enters the reducer cavity through the left / right reducer oil passage for lubrication and cooling of the reducer. After the oil completes its lubrication and cooling process, the oil that falls into the reducer cavity enters the return oil cavity through the connecting groove of the front baffle, and then falls back into the oil sump cavity through the return oil groove of the bottom partition. The oil that falls into the motor cavity falls back into the oil sump cavity through the left motor return oil groove / right motor return oil groove, thus forming a dual-motor cooling and lubrication oil circuit.

[0008] In this technical solution, oil cooling is used for motor lubrication and cooling. The motor is small in size, facilitates component integration design, and is low in cost. The parallel dual-motor design shortens the axial length of the electric drive system. Each motor has an independent lubrication and cooling oil circuit, which operates independently without interference. If one oil circuit fails and requires single-motor operation, only that side's oil circuit system operates. When both motors are running, each operates its own oil circuit system. Even if a single motor or a single-side lubrication oil circuit fails, the other circuit can still operate effectively, ensuring the basic power of the electric drive system. Furthermore, the oil sump is located at the bottom of the motor housing and separated by a bottom baffle, creating an independent space that prevents the agitation of deposited impurities and reduces the risk of the oil pump drawing in cavitation.

[0009] A further technical solution is to provide a junction box mounting area on the top of the motor housing. By placing the junction box on the top of the motor housing, the three-phase wire interfaces can be arranged facing forward or backward, making it convenient for the vehicle to connect the three-phase wires as needed.

[0010] A further technical solution is that the two side walls of the motor housing are also provided with suspension mounting parts.

[0011] A further technical solution is to provide an oil level observation port on the rear housing to facilitate observation of the cooling system's operation and oil level.

[0012] A further technical solution is to provide a reversible connector on the rear housing.

[0013] A further technical solution is to provide an oil temperature sensor mounting hole on the side wall of the oil tank cavity.

[0014] A further technical solution involves providing oil passages for the left and right motors at corresponding positions in the left and right motor cavities, respectively, on the front partition. In this solution, part of the oil entering the motor cavity returns to the oil sump cavity via the aforementioned technical solution, while the other part enters the reducer cavity through the oil passages and then returns to the oil sump cavity via the connecting groove of the front partition and the return groove of the return oil cavity, thus preventing oil accumulation in the motor cavity.

[0015] A further technical solution is to provide a through-hole in the front partition at the corresponding position of the venting cavity. The through-hole can prevent oil accumulation in the venting cavity from affecting ventilation.

[0016] A further technical solution involves providing a motor isolation chamber between the vent chamber and the oil return chamber. This motor isolation chamber prevents the heat from the left and right motors from affecting each other, ensuring that their proximity prevents excessive temperature rise and thus improving heat dissipation.

[0017] An electric drive system includes the aforementioned dual-motor housing assembly.

[0018] The beneficial effects of this invention are: This invention provides a dual-motor housing assembly and electric drive system. It employs oil cooling for motor lubrication and cooling, resulting in small motor size, easy component integration, and low cost. The parallel dual-motor design shortens the axial length of the electric drive system. Each motor has an independent lubrication and cooling oil circuit, ensuring independent operation. If one oil circuit fails and requires single-motor operation, only that side's oil circuit system operates. When both motors are running, each operates its own oil circuit system. Even in the event of a single motor or single-side lubrication oil circuit failure, the other circuit can still operate effectively, guaranteeing the basic power of the electric drive system. Furthermore, the oil sump is located at the bottom of the motor housing and separated by a bottom partition, creating an independent space that prevents the agitation of deposited impurities and reduces the risk of cavitation in the oil pump. Attached Figure Description

[0019] Figure 1 See: A structural schematic diagram of the dual-motor housing assembly described in this invention.

[0020] Figure 2See: Front perspective view of the dual-motor housing assembly described in this invention.

[0021] Figure 3 See: Rear perspective view of the dual-motor housing assembly described in this invention.

[0022] Figure 4 See: A schematic diagram of the motor cavity of the dual-motor housing assembly described in this invention.

[0023] Figure 5 See: A bottom schematic diagram of the dual-motor housing assembly described in this invention.

[0024] Figure 6 See: Left view of the dual-motor housing assembly of the present invention.

[0025] Figure 7 for: Figure 6 AA section view.

[0026] Figure 8 for: Figure 6 BB cross-section diagram.

[0027] Figure 9 See: Front view of the dual-motor housing assembly described in this invention.

[0028] Figure 10 for: Figure 9 CC cross-section view.

[0029] Figure 11 for: Figure 9 DD cross-section diagram.

[0030] In the picture: 1. Motor housing; 11. Front partition; 111. Connecting groove; 112. Left motor oil passage; 113. Right motor oil passage; 114. Connecting hole; 12. Bottom partition; 121. Oil return groove; 13. Left motor cavity; 131. Left motor oil return groove; 132. Left motor oil passage; 14. Right motor cavity; 141. Right motor oil return groove; 142. Right motor oil passage; 130. Vent chamber 1301. Vent hole; 140. Oil return chamber; 15. Cooler mounting section; 151. Left cooler oil inlet; 152. Left cooler oil outlet; 153. Right cooler oil inlet; 154. Right cooler oil outlet; 155. Left cooling oil passage; 156. Right cooling oil passage; 16. Left fine filter mounting section; 161. Left fine filter oil inlet; 162. Left fine filter oil outlet; 163. Left... 17. Right fine filter mounting section; 171. Right fine filter inlet; 172. Right fine filter outlet; 173. Right filter oil passage; 18. Left oil pump mounting section; 181. Left oil pump inlet; 182. Left oil pump outlet; 19. Right oil pump mounting section; 191. Right oil pump inlet; 192. Right oil pump outlet; 10. Junction box mounting section; 2. Front housing; 20. Reducer cavity ; 201, Left reducer oil passage; 202, Right reducer oil passage; 21, Power output port; 3, Rear housing; 31, Left rotary converter cavity; 32, Right rotary converter cavity; 33, Left end cover; 34, Right end cover; 35, Oil level observation port; 36, Rotary converter wiring port; 4, Oil pan; 40, Oil sump cavity; 41, Oil temperature sensor mounting hole; 5, Junction box; 51, Junction box cover; 6, Suspension mounting part. Detailed Implementation

[0031] The following is in conjunction with the appendix Figures 1 to 11 The present invention will be described in detail below with reference to specific embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] like Figures 1 to 11 As shown, this embodiment provides a dual-motor housing assembly, including a motor housing 1, a front housing 2 that is sealed to the front end of the motor housing 1, a rear housing 3 that is sealed to the rear end of the motor housing 1, and an oil pan 4 that is sealed to the bottom of the motor housing 1. like Figures 1 to 4 As shown, the front end of the motor housing 1 is provided with a front partition 11, and a reducer cavity 20 for installing a reducer gear set is provided between the front partition 11 and the front housing 2; specifically, the front partition 11 is integrally formed with the motor housing 1, and the motor housing at the outer periphery of the front partition 11 extends towards the front end and is fixedly and sealed to the front housing 2 through a fastener, thereby forming the reducer cavity 20. The bottom of the motor housing 1 is provided with a bottom partition 12, and an oil sump cavity 40 for accommodating lubricating oil is provided between the bottom partition 12 and the oil pan 4. Specifically, the bottom partition 12 is integrally formed with the motor housing 1, and the motor housing extends downward from the outer periphery of the bottom partition 12 and is fixedly and sealed to the oil pan 4 through a fastener, thereby forming the oil sump cavity 40. The motor housing 1 has a left motor cavity 13 and a right motor cavity 14 arranged side by side inside. The lower walls of the left motor cavity 13 and the right motor cavity 14 are respectively provided with a left motor oil return groove 131 and a right motor oil return groove 141 that communicate with the oil sump cavity 40. The motor housing between the left motor cavity 13 and the right motor cavity 14 is provided with an upper vent cavity 130 and a lower oil return cavity 140. The vent cavity 130 has a vent hole 1301 that penetrates the upper wall of the motor housing, and the oil return cavity has an oil return groove 121 that penetrates the bottom partition 12. The bottom of the front partition 11 is also provided with a connecting groove 111 that connects the reducer cavity 20 and the oil return cavity 140. The rear housing 3 is provided with a left-hand variable cavity 31 and a right-hand variable cavity 32 that are connected to the left motor cavity 13 and the right motor cavity 14 respectively, and the rear ends are respectively sealed with a left end cover 33 and a right end cover 34; the front partition 11 is provided with motor output holes that are connected to the left motor cavity and the right motor cavity respectively; specifically, the rear ends of the left motor cavity 13 and the right motor cavity 14 penetrate through the motor housing 1, and the rear end of the motor housing 1 extends to the right a certain distance and is then sealed by a fastener, so that there is a certain gap between the rear ends of the left motor cavity 13 and the right motor cavity 14 and the rear housing 3, so that the oil in the two motor cavities can communicate with each other; the left and right motors are connected to the reducer gear set through the corresponding motor output holes; The motor housing 1 has a cooler mounting part 15, a left fine filter mounting part 16 and a right fine filter mounting part 17 at the bottom front end and outside the oil sump cavity 40. The side wall of the oil tank cavity 40 is provided with a left oil pump mounting part 18 and a right oil pump mounting part 19. like Figures 5 to 11 As shown, the left oil pump mounting part 18 is provided with a left oil pump suction port 181 and a left oil pump outlet port 182; the cooler mounting part 15 is provided with a left cooler inlet port 151 and a left cooler outlet port 152; the left fine filter mounting part 16 is provided with a left fine filter inlet port 161 and a left fine filter outlet port 162; the motor housing 1 has a left cooling oil passage 155 connecting the left oil pump outlet port 182 and the left cooler inlet port 151, a left filter oil passage 163 connecting the left cooler outlet port 152 and the left fine filter inlet port 161, a left motor oil passage 132 connecting the left fine filter outlet port 162 and the left motor cavity 13, and a left reducer oil passage 201 connecting the left fine filter outlet port 162 and the reducer cavity 20. The right oil pump mounting part 19 is provided with a right oil pump suction port 191 and a right oil pump outlet port 192; the cooler mounting part 15 is provided with a right cooler inlet port 153 and a right cooler outlet port 154; the right fine filter mounting part 17 is provided with a right fine filter inlet port 171 and a right fine filter outlet port 172; the motor housing 1 has a right cooling oil passage 156 connecting the right oil pump outlet port 192 and the right cooler inlet port 154, a right filter oil passage 173 connecting the right cooler outlet port 154 and the right fine filter inlet port 171, a right motor oil passage 142 connecting the right fine filter outlet port 172 and the right motor cavity 14, and a right reducer oil passage 202 connecting the right fine filter outlet port 172 and the reducer cavity 20. Among them, the oil pump suction port is connected to the oil pump outlet port through the oil pump, the cooler inlet port is connected to the cooler outlet port through the cooler, and the fine filter inlet port is connected to the fine filter outlet port through the fine filter.

[0033] The working principle of this technical solution is as follows: Structurally, the reducer cavity 20 and the motor cavity are separated by a front partition 11. The front partition 11, the side wall of the reducer cavity 20, and the motor housing 1 are integrally formed. The reducer cavity 20 and the oil sump cavity 40 are separated by a bottom partition 12. The bottom partition 12, the side wall of the oil sump cavity 40, and the motor housing 1 are integrally formed. The resolver cavity is located at the rear end of the housing assembly and is coaxial with the center line of the corresponding motor cavity. The reducer cavity 20 is sealed by the front housing 2 and is used to install the reducer gear set. The motor housing 1 is sealed by the rear housing 3, and the rear ends of the two motor cavities can communicate with each other to facilitate the flow of lubricating fluid. The oil sump cavity 40 is formed by sealing the oil pan 4 and is used to store lubricating oil. The resolver cavity is located between the rear housing 3 and the motor cavity and is sealed by the left end cover 33 and the right end cover 34 respectively, which has high space utilization and is easy to disassemble and inspect. The front housing 2 is provided with a power output system docking surface to facilitate docking with the power system.

[0034] Regarding the oil circuit, after the housing assembly is assembled, the left / right oil pump draws oil from the bottom of the oil sump 40 through the left oil pump suction port 181 / right oil pump suction port 191. The oil passes through the left / right oil pump, then through the left oil pump outlet port 182 / right oil pump outlet port 192, the left cooling oil passage 155 / right cooling oil passage 156, the left cooler inlet port 151 / right cooler inlet port 153, and finally through the left cooler outlet port 152 / right cooler outlet port. Oil 154 enters the left filter oil passage 163 / right filter oil passage 173, thus entering the left / right fine filter. After flowing out from the left fine filter oil outlet 162 / right fine filter oil outlet 172, it splits into two paths. One path passes through the left motor oil passage 132 / right motor oil passage 142 into the left motor cavity 13 / right motor cavity 14 for lubrication and cooling of the left / right motor. The other path passes through the left reducer oil passage 201 / right reducer oil passage 202 into the reducer cavity 20 for lubrication and cooling of the reducer. After lubrication and cooling, the oil that falls into the reducer cavity 20 enters the return oil cavity 140 through the connecting groove 111 of the front baffle 11, and then falls back into the oil sump cavity 40 through the return oil groove 121 of the bottom partition 12. The oil that falls into the motor cavity falls back into the oil sump cavity 40 through the left motor return oil groove 131 / right motor return oil groove 141, thus forming a dual-motor cooling and lubrication oil circuit.

[0035] This embodiment uses oil cooling for motor lubrication and cooling. The motor is small in size and easy to integrate into the design, resulting in low cost. The parallel dual-motor design shortens the axial length of the electric drive system. Each motor has an independent lubrication and cooling oil circuit, which operates independently without interference. If one side of the oil circuit fails and requires single-motor operation, only that side's oil circuit system operates. When both motors are running, each operates its own oil circuit system. Even if a single motor or one side of the lubrication oil circuit fails, the other circuit can still operate effectively, ensuring the basic power of the electric drive system. Furthermore, the oil sump 40 is located at the bottom of the motor housing 1 and separated by a bottom partition 12, creating an independent space that prevents the agitation of deposited impurities and reduces the risk of the oil pump drawing in cavitation.

[0036] In addition, the oil return groove 121 of the above embodiment can be arranged in two or more at intervals along the axis of the motor, which can facilitate the oil in the oil return chamber 140 to fall back into the oil sump chamber 40.

[0037] The above embodiment exemplarily shows the structure in which the left reducer oil passage 201 and the right reducer oil passage 202 are opened inside the motor housing 1. In other embodiments or practical applications, some of the left reducer cavity oil passage 201 and the right reducer oil passage 202 can also be opened in the front housing 2, so that the oil passage in the front housing 2 is connected to the oil passage in the motor housing 1, and the oil can be delivered to the optimal position of the reducer cavity 20.

[0038] In another embodiment, based on the above embodiment, a junction box mounting part 10 is also provided on the top of the motor housing 1. This junction box is used to install the junction box connected to the motor. By placing the junction box on the top of the motor housing 1, the three-phase wire interfaces can be arranged facing forward or backward, facilitating the connection of the three-phase wires to the vehicle as needed.

[0039] In another embodiment, based on the above embodiment, the two side walls of the motor housing 1 are further provided with suspension mounting parts 6 for fixing the motor housing assembly in the power system.

[0040] Another implementation method, based on the above implementation method, such as... Figure 3 As shown, the rear housing 3 is also provided with an oil level observation port 35, which facilitates observation of the operation of the cooling system and the oil level.

[0041] Another implementation method, based on the above implementation method, such as... Figure 3 As shown, the rear housing 3 is also provided with a resolver connector 36.

[0042] Another implementation method, based on the above implementation method, such as... Figure 3 As shown, the side wall of the oil sump 40 is provided with an oil temperature sensor mounting hole 41 for monitoring the oil temperature.

[0043] Another implementation method, based on the above implementation method, such as... Figure 8 As shown, the front partition 11 has left motor oil passage 112 and right motor oil passage 113 at corresponding positions in the left motor cavity 13 and right motor cavity 14, respectively. In this embodiment, part of the oil entering the motor cavity returns to the oil sump cavity 40 through the oil passage of the above embodiment, and the other part enters the reducer cavity 20 through the left motor oil passage 112 and right motor oil passage 113, and then returns to the oil sump cavity 40 through the connecting groove 111 of the front partition 11 and the oil return groove 121 of the return oil cavity 140, which can prevent oil accumulation in the left motor cavity 13 and right motor cavity 14.

[0044] Another implementation method, based on the above implementation method, such as... Figure 8 As shown, the front partition 11 has a through-hole 114 at the corresponding position of the vent 130. The through-hole 114 can prevent oil accumulation in the vent 130 from affecting ventilation.

[0045] In another embodiment, based on the above embodiment, a motor partition is further provided between the vent chamber 130 and the oil return chamber 140. The motor partition can prevent the heat from the left and right motors from affecting each other, and will not cause excessive temperature rise due to being too close, thus affecting the heat dissipation effect.

[0046] In another embodiment, an electric drive system is provided, comprising the dual-motor housing assembly of the above embodiment, left and right motors respectively mounted in the left motor cavity 13 and the right motor cavity 14, left and right oil pumps respectively mounted in the left oil pump mounting part 18 and the right oil pump mounting part 19, left and right fine filters respectively mounted in the left fine filter mounting part 16 and the right fine filter mounting part 17, a cooler mounted in the cooler mounting part 15, a reducer gear set mounted inside the reducer cavity 20, left and right motor resolvers respectively mounted in the left resolver cavity 31 and the right resolver cavity 32, and a junction box 5 mounted in the junction box mounting part 10, wherein the junction box 5 is sealed by a junction box cover plate 51, and the power of the electric drive system is directly output through a power output hole 21 located at the center of the front housing 2.

[0047] This invention provides a dual-motor housing assembly and electric drive system. The motors are lubricated and cooled using oil cooling, resulting in small motor size, easy component integration design, and low cost. The parallel dual-motor design shortens the axial length of the electric drive system. Each motor has an independent lubrication and cooling oil circuit, which operates independently without interference. If one oil circuit fails and requires single-motor operation, only that side's oil circuit system operates. When both motors are running, each operates its own oil circuit system. Even if a single motor or one side's lubrication oil circuit fails, the other circuit can still operate effectively, ensuring the basic power of the electric drive system. Furthermore, the oil sump 40 is located at the bottom of the motor housing 1 and separated by a bottom partition 12, creating an independent space that prevents the agitation of deposited impurities and reduces the risk of the oil pump drawing in cavitation.

Claims

1. A dual motor housing assembly, characterized by, It includes a motor housing, a front housing that is sealed to the front end of the motor housing, a rear housing that is sealed to the rear end of the motor housing, and an oil pan that is sealed to the bottom of the motor housing; The front end of the motor housing is provided with a front partition, and a reducer cavity for installing a reducer gear set is provided between the front partition and the front housing; the bottom of the motor housing is provided with a bottom partition, and an oil sump cavity for containing lubricating oil is provided between the bottom partition and the oil pan; the motor housing has a left motor cavity and a right motor cavity arranged side by side, and the lower walls of the left motor cavity and the right motor cavity are respectively provided with a left motor oil return groove and a right motor oil return groove that communicate with the oil sump cavity; The motor housing between the left motor cavity and the right motor cavity is provided with an upper vent cavity and a lower oil return cavity. The vent cavity has a vent hole that penetrates the upper wall of the motor housing, and the oil return cavity has an oil return groove that penetrates the bottom partition. The bottom of the front partition is also provided with a connecting groove that connects the reducer cavity and the oil return cavity. The rear housing is provided with a left-hand rotary converter and a right-hand rotary converter that are connected to the left motor cavity and the right motor cavity respectively, and the rear end is respectively sealed with an end cap; the front partition is provided with a motor output hole that is connected to the left motor cavity and the right motor cavity respectively. The motor housing has a cooler mounting part, a left fine filter mounting part, and a right fine filter mounting part at the bottom front end and outside the oil sump cavity; the oil sump cavity has a left oil pump mounting part and a right oil pump mounting part on its side wall. The left oil pump mounting part is provided with a left oil pump suction port and a left oil pump outlet port; the cooler mounting part is provided with a left cooler inlet port and a left cooler outlet port; the left fine filter mounting part is provided with a left fine filter inlet port and a left fine filter outlet port; the motor housing has a left cooling oil passage connecting the left oil pump outlet port and the left cooler inlet port, a left filter oil passage connecting the left cooler outlet port and the left fine filter inlet port, a left motor oil passage connecting the left fine filter outlet port and the left motor cavity, and a left reducer oil passage connecting the left fine filter outlet port and the reducer cavity. The right oil pump mounting part is provided with a right oil pump suction hole and a right oil pump outlet hole; the cooler mounting part is provided with a right cooler inlet hole and a right cooler outlet hole; the right fine filter mounting part is provided with a right fine filter inlet hole and a right fine filter outlet hole; the motor housing has a right cooling oil passage connecting the right oil pump outlet hole and the right cooler inlet hole, a right filter oil passage connecting the right cooler outlet hole and the right fine filter inlet hole, a right motor oil passage connecting the right fine filter outlet hole and the right motor cavity, and a right reducer oil passage connecting the right fine filter outlet hole and the reducer cavity.

2. A dual motor housing assembly as set forth in claim 1 wherein, The top of the motor housing is also provided with a junction box mounting section.

3. A dual motor housing assembly as set forth in claim 1 wherein, The motor housing is also provided with suspension mounting parts on both side walls.

4. A dual motor housing assembly as set forth in claim 1 wherein, The rear housing is also equipped with an oil level observation port.

5. A dual-motor housing assembly according to claim 1, characterized in that, The rear housing is also provided with a reversible connector.

6. A dual motor housing assembly as set forth in claim 1 wherein, The side wall of the oil tank cavity is provided with an oil temperature sensor mounting hole.

7. A dual motor housing assembly as set forth in claim 1 wherein, The front partition has oil passage holes for the left motor and right motor respectively at corresponding positions in the left motor cavity and right motor cavity.

8. A dual motor housing assembly as set forth in claim 1 wherein, The front partition has a through-hole at the corresponding position of the ventilation cavity.

9. A dual motor housing assembly as set forth in claim 1 wherein, A motor isolation chamber is also provided between the venting chamber and the oil return chamber.

10. An electric drive system comprising the dual-motor housing assembly as described in any one of claims 1 to 9.

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