Electrically-driven cooling and lubricating system and vehicle

Abstract

The invention discloses an electrically-driven cooling and lubricating system and a vehicle, the electrically-driven cooling and lubricating system comprises an electrically-driven structure, the electrically-driven structure comprises a machine shell, a stator assembly, a rotor assembly and a speed reducer, and the stator assembly, the rotor assembly and the speed reducer are all installed in the machine shell; the main oil way communicates with the oil pan through the oil pumping assembly, the stator assembly and the rotor assembly are connected in series and distributed in the first oil way, so that oil in the first oil way sequentially passes through the stator assembly, the rotor assembly and the speed reducer to be distributed in the second oil way, and oil in the second oil way passes through the speed reducer to be distributed in the oil pan. The first oil way and the second oil way are distributed in parallel and connected to the main oil way in series. According to the electrically-driven cooling and lubricating system, the stator assembly and the rotor assembly are sequentially connected to the first oil way in series, so that the stator assembly and the rotor assembly share one oil way, the total number of parallel oil ways is reduced, the capacity of the oil pump assembly is reduced, and the setting cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric drive cooling and lubrication, and particularly relates to an electric drive cooling and lubrication system and a vehicle with the same. BACKGROUND

[0002] An oil-cooled electric drive system can greatly improve the heat dissipation capacity of the electric drive system, and thus realize the integration, miniaturization and low cost of the electric drive system, and is a development direction of the electric drive system. The existing oil-cooled electric drive system is limited by the stator cooling configuration, and the stator and rotor cooling oil circuits are mostly in parallel topology, which results in a large flow and power required by the oil pump, and there is room for improvement. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides an electric drive cooling and lubrication system, which is configured to connect a stator assembly and a rotor assembly in series in a first oil circuit, so that the stator assembly and the rotor assembly share an oil circuit, thereby reducing the total number of parallel oil circuits and reducing the capacity of the oil pump assembly to reduce the installation cost.

[0004] The electric drive cooling and lubrication system according to the embodiments of the present application comprises: an electric drive structure, the electric drive structure comprising a casing, a stator assembly, a rotor assembly and a reducer, the stator assembly, the rotor assembly and the reducer being installed in the casing; a first oil circuit, a second oil circuit and a main oil circuit, the main oil circuit being communicated with an oil pan through a pump oil assembly, the stator assembly and the rotor assembly being distributed in series in the first oil circuit, so that the oil in the first oil circuit passes through the stator assembly and the rotor assembly in sequence, the reducer being distributed in the second oil circuit, so that the oil in the second oil circuit passes through the reducer, and the first oil circuit and the second oil circuit being distributed in parallel and being connected in series to the main oil circuit.

[0005] The electric drive cooling and lubrication system according to the embodiments of the present application is configured to connect a stator assembly and a rotor assembly in series in a first oil circuit, so that the oil in the first oil circuit passes through the stator assembly and the rotor assembly in sequence, thereby realizing the sequential cooling of the stator assembly and the rotor assembly, and the second oil circuit and the first oil circuit are distributed in parallel and connected in series to the main oil circuit, thereby realizing the oil distribution, and the structures in the first oil circuit and the second oil circuit can be cooled and lubricated respectively, thereby meeting the cooling and lubrication requirements of the electric drive structure, and the stator assembly and the rotor assembly share an oil circuit, thereby reducing the total number of parallel oil circuits and reducing the capacity of the oil pump assembly to reduce the installation cost.

[0006] The electric drive cooling and lubrication system according to some embodiments of the present application, the first oil circuit comprises a stator branch oil circuit and a rotor branch oil circuit, the stator branch oil circuit and the rotor branch oil circuit are connected in series, the stator branch oil circuit is connected with the main oil circuit, and the rotor branch oil circuit is connected with the oil pan.

[0007] According to some embodiments of the application, the stator branch oil circuit comprises a stator end oil cavity and a stator core oil circuit, the stator end oil cavity comprises a first oil cavity and a second oil cavity, the stator core oil circuit comprises a core winding oil circuit and a core yoke oil circuit, the core winding oil circuit and the core yoke oil circuit are connected between the first oil cavity and the second oil cavity respectively, the first oil cavity is connected with the main oil circuit, and the second oil cavity is connected with the rotor branch oil circuit. The main oil circuit is connected with a control valve and a radiator.

[0008] According to some embodiments of the application, the rotor branch oil circuit comprises a casing end cover oil circuit and a rotor shaft oil circuit arranged in series, the casing end cover oil circuit is connected with the second oil cavity, and the rotor shaft oil circuit is sequentially arranged with a rotor shaft, a primary gear and an oil pan.

[0009] According to some embodiments of the application, the first oil circuit further comprises a half shaft bearing branch oil circuit, the half shaft bearing branch oil circuit is used for lubricating a half shaft bearing, the half shaft bearing branch oil circuit is arranged in parallel with the rotor shaft oil circuit and is connected between the casing end cover oil circuit and the oil pan.

[0010] According to some embodiments of the application, the second oil circuit comprises a reducer total oil circuit, a secondary gear oil circuit, a differential oil circuit, a reducer rear bearing oil circuit and an oil seal oil circuit, the reducer total oil circuit is connected with the main oil circuit, the secondary gear oil circuit, the differential oil circuit, the reducer rear bearing oil circuit and the oil seal oil circuit are arranged in parallel and are connected in series between the reducer total oil circuit and the oil pan.

[0011] According to some embodiments of the application, the casing is provided with a first oil return hole and a second oil return hole, the first oil return hole and the second oil return hole are connected with the oil pan, the secondary gear oil circuit and the differential oil circuit are connected with the first oil return hole, and the reducer rear bearing oil circuit and the oil seal oil circuit are connected with the second oil return hole.

[0012] According to some embodiments of the application, the electric drive cooling lubrication system further comprises a bearing oil circuit arranged in the casing, the bearing oil circuit comprises a bearing total oil circuit, a motor front bearing oil circuit, a reducer front bearing oil circuit and a motor rear bearing oil circuit, the bearing total oil circuit is connected with the main oil circuit, the motor front bearing oil circuit, the reducer front bearing oil circuit and the motor rear bearing oil circuit are arranged in parallel and are connected in series between the bearing total oil circuit and the oil pan.

[0013] According to some embodiments of the electric drive cooling and lubrication system of the present invention, the housing is provided with a first bearing oil return hole at the front bearing of the motor and the front bearing of the reducer, the oil passage of the front bearing of the motor and the oil passage of the front bearing of the reducer are connected to the oil pan through the first bearing oil return hole, and the housing is provided with a second bearing oil return hole at the rear bearing of the motor, the oil passage of the rear bearing of the motor is connected to the oil pan through the second bearing oil return hole.

[0014] The present invention also proposes a vehicle.

[0015] The vehicle according to embodiments of the present invention includes the electric drive cooling and lubrication system of any of the above embodiments.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of an electric drive cooling and lubrication system according to an embodiment of the present invention; Figure 2 This is a cross-section of an electric drive cooling and lubrication system according to an embodiment of the present invention. Figure 1 ; Figure 3 This is a cross-section of an electric drive cooling and lubrication system according to an embodiment of the present invention. Figure 2 ; Figure 4 This is a partial schematic diagram of the stator assembly of an electric drive cooling and lubrication system according to an embodiment of the present invention; Figure 5 This is a partial schematic diagram of an electric drive cooling and lubrication system according to an embodiment of the present invention. Figure 1 ; Figure 6 This is a partial schematic diagram of an electric drive cooling and lubrication system according to an embodiment of the present invention. Figure 2 .

[0018] Figure label: Electric drive cooling and lubrication system 100, Electric drive structure 1, housing 11, housing end cover 111, oil pan 112, first oil return hole 113, second oil return hole 114, first bearing oil return hole 115, second bearing oil return hole 116, motor rear end oil return hole 117, end cover plate 118, third oil return hole 119, stator assembly 12, stator end winding 121, stator core 122, sealing oil ring 123, rotor assembly 13, sealing slip ring 131, reducer 14, reducer rear housing 141, first stage gear 142, first stage needle roller bearing 1421, first stage needle roller bearing oil passage 1422, second stage gear 143, second stage needle roller bearing 1431, second stage needle roller bearing oil passage 1432, differential 144, reducer rear bearing 145, oil seal 146, reducer front bearing 147. First oil passage 2, stator branch oil passage 21, stator end oil cavity 211, first oil cavity 2111, second oil cavity 2112, oil cavity inlet 2113, stator core oil passage 212, core winding oil passage 2121, core yoke oil passage 2122. Rotor branch oil passage 22, housing end cover oil passage 221, stator first oil drain hole 2211, stator second oil drain hole 2212, rotor shaft oil passage 222, rotor shaft 2221, rotor shaft oil drain hole 2222, first stage gear oil passage 2223, half-shaft bearing branch oil passage 23, half-shaft bearing 231. Second oil circuit 3, reducer main oil circuit 31, secondary gear oil circuit 32, differential oil circuit 33, reducer rear bearing oil circuit 34, oil seal oil circuit 35. Main oil circuit 4, control valve 41, first oil outlet 411, second oil outlet 412, radiator 42, bearing oil circuit 5, main bearing oil circuit 51, motor front bearing oil circuit 52, reducer front bearing oil circuit 53, motor rear bearing oil circuit 54, motor front bearing 55, motor rear bearing 56, oil pump assembly 6, oil filter 61, oil pump 62. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Unless otherwise specified, the front-back direction in this application refers to the longitudinal direction of the vehicle, i.e., the X direction; the left-right direction refers to the lateral direction of the vehicle, i.e., the Y direction; and the up-down direction refers to the vertical direction of the vehicle, i.e., the Z direction.

[0022] The following is for reference. Figures 1-6 The electric drive cooling and lubrication system 100 according to an embodiment of the present invention is described in which the stator assembly 12 and the rotor assembly 13 are connected in series in the first oil passage 2, so that the stator assembly 12 and the rotor assembly 13 share a single oil passage, thereby reducing the total number of parallel oil passages and reducing the capacity of the oil pump assembly 6, thus reducing the installation cost.

[0023] like Figures 1-6 As shown, an electric drive cooling and lubrication system 100 according to an embodiment of the present invention includes: an electric drive structure 1, a first oil passage 2, a second oil passage 3, and a main oil passage 4.

[0024] The electric drive structure 1 includes a housing 11, a stator assembly 12, a rotor assembly 13, and a reducer 14. The stator assembly 12, rotor assembly 13, and reducer 14 are all installed inside the housing 11. The main oil passage 4 is connected to the oil pan 112 through the oil pump assembly 6. The stator assembly 12 and rotor assembly 13 are connected in series in the first oil passage 2 so that the oil in the first oil passage 2 passes through the stator assembly 12 and rotor assembly 13 in sequence. The reducer 14 is distributed in the second oil passage 3 so that the oil in the second oil passage 3 passes through the reducer 14.

[0025] Specifically, the electric drive cooling and lubrication system 100 is used to cool and lubricate the electric drive structure 1 to ensure the stability and safety of its operation. The electric drive structure 1 includes a housing 11, which serves as the external support and protection structure for the electric drive structure 1. The housing 11 provides installation space for the stator assembly 12, rotor assembly 13, and reducer 14, allowing them to be integrated into a single unit and providing protection for these components. The stator assembly 12 and rotor assembly 13 form a motor structure. The rotor assembly 13 can be nested within the stator assembly 12 and rotates relative to it. Power is output through the rotor assembly 13. The reducer 14 is connected to the rotor assembly 13, enabling the rotor assembly 13 to drive the reducer 14 and achieve power output.

[0026] The stator assembly 12, rotor assembly 13 and reducer 14 are detachably connected to the housing 11, which facilitates the installation of the stator assembly 12, rotor assembly 13 and reducer 14 to the housing 11, and facilitates subsequent disassembly for maintenance.

[0027] The main oil circuit 4 is the main oil circuit of the electric drive cooling and lubrication system 100, used to transport cooling and lubricating oil to the first oil circuit 2 and the second oil circuit 3. The main oil circuit 4 is connected to the oil pan 112, which stores oil. The oil in the oil pan 112 can be circulated into the main oil circuit 4. The stator assembly 12 and the rotor assembly 13 are connected in series in the first oil circuit 2. That is, the stator assembly 12 and the rotor assembly 13 can form a series oil circuit through the first oil circuit 2. In this way, the oil in the first oil circuit 2 can pass through the stator assembly 12 and the rotor assembly 13 in sequence to cool the stator assembly 12 and the rotor assembly 13. The reducer 14 is distributed in the second oil circuit 3. That is, the reducer 14 can be connected to the lubrication oil circuit through the second oil circuit 3. In this way, the oil in the second oil circuit 3 passes through the reducer 14 to lubricate the components inside the reducer 14.

[0028] An oil pump assembly 6 is installed between the oil pan 112 and the main oil passage 4. The oil pump assembly 6 pumps the oil from the oil pan 112 into the main oil passage 4. The oil pump assembly 6 includes an oil pump 62 and an oil filter 61. The oil filter 61 filters impurities in the oil, keeping it clean, improving lubrication, and reducing damage to the structure caused by impurities. The oil pump 62 draws the oil from the oil pan 112 into the main oil passage 4. The oil filter 61 and oil pump 62 are located at the bottom of the housing 11. The oil inlet of the oil filter 61 is located in the closed oil cavity formed by the housing 11 and the oil pan 112. The oil outlet of the oil filter 61 connects to the internal oil passage of the housing 11 and communicates with the oil pump 62 inlet. The oil pump 62 is fixed in the housing 11, with its inlet connected to the oil filter 61 and its outlet connected to the main oil passage 4.

[0029] Furthermore, the first oil passage 2 and the second oil passage 3 are connected in parallel and are both connected in series with the main oil passage 4. That is to say, the first oil passage 2 is connected in series with the main oil passage 4, and the second oil passage 3 is connected in series with the main oil passage 4. The first oil passage 2 and the second oil passage 3 are connected in parallel, with the main oil passage 4 located upstream and the first oil passage 2 and the second oil passage 3 located downstream. In this way, part of the oil in the main oil passage 4 can flow to the first oil passage 2, and the other part can flow to the second oil passage 3, realizing the diversion of oil flow, so as to cool and lubricate the structures in the first oil passage 2 and the second oil passage 3 respectively.

[0030] In actual use, the oil pump assembly 6 draws the oil from the oil pan 112 into the main oil passage 4. After passing through the main oil passage 4, the oil is divided into two oil passages. One part of the oil flows to the first oil passage 2 to cool the stator assembly 12 and rotor assembly 13 in the first oil passage 2 in sequence, and the other part of the oil flows to the second oil passage 3 to lubricate and cool the reducer 14 in the second oil passage 3.

[0031] In typical electric drive oil-cooled systems, due to the limited cooling configuration of the stator assembly 12, the cooling oil circuits of the stator assembly 12 and the rotor assembly 13 are mostly in parallel topology. In this parallel cooling oil circuit, the stator assembly 12 is cooled through a separate cooling oil circuit, and the rotor assembly 13 is also cooled through a separate cooling oil circuit. This results in a large flow rate and power required by the oil pump assembly 6. This application sets the stator assembly 12 and the rotor assembly 13 in series in the first oil circuit 2, so that the stator assembly 12 and the rotor assembly 13 can share a single first oil circuit 2. This reduces the number of parallel cooling oil circuits, thereby reducing the required flow rate and power of the oil pump assembly 6, lowering the capacity of the oil pump assembly 6, and reducing the installation cost.

[0032] According to an embodiment of the present invention, the electric drive cooling and lubrication system 100, by setting the stator assembly 12 and the rotor assembly 13 in series in the first oil passage 2, allows the oil in the first oil passage 2 to pass through the stator assembly 12 and the rotor assembly 13 in sequence, thereby achieving sequential cooling of the stator assembly 12 and the rotor assembly 13. The second oil passage 3 is distributed in parallel with the first oil passage 2 and is connected in series in the main oil passage 4, thereby achieving oil diversion. The structures in the first oil passage 2 and the second oil passage 3 can be cooled and lubricated respectively, meeting the cooling and lubrication requirements of the electric drive structure 1. Furthermore, the stator assembly 12 and the rotor assembly 13 share a single oil passage, reducing the total number of parallel oil passages and the capacity of the oil pump assembly 6, thereby reducing the installation cost.

[0033] In some embodiments, the first oil circuit 2 includes a stator branch oil circuit 21 and a rotor branch oil circuit 22, which are connected in series. The stator branch oil circuit 21 is connected to the main oil circuit 4, and the rotor branch oil circuit 22 is connected to the oil pan 112.

[0034] Specifically, the stator branch oil passage 21 is used to cool the stator assembly 12, and the rotor branch oil passage 22 is used to cool the rotor assembly 13. The stator branch oil passage 21 and the rotor branch oil passage 22 are connected in series. The main oil passage 4 is connected to the oil pan 112. One end of the stator branch oil passage 21 is connected to the main oil passage 4, and the other end is connected to one end of the rotor branch oil passage 22. The other end of the rotor branch oil passage 22 is connected to the oil pan 112. The stator branch oil passage 21 is connected to the stator assembly 12, and the rotor branch oil passage 22 is connected to the rotor assembly 13. In this way, a loop can be formed between the oil pan 112, the stator assembly 12, and the rotor assembly 13.

[0035] In practical use, the oil in the oil pan 112 can flow back to the oil pan 112 after passing through the main oil passage 4, the stator branch oil passage 21, and the rotor branch oil passage 22 in sequence, thus cooling the stator assembly 12 and the rotor assembly 13. By connecting the stator branch oil passage 21 and the rotor branch oil passage 22 in series, the cooling of the stator assembly 12 and the rotor assembly 13 can be completed in one oil passage, effectively reducing the required flow rate and power of the oil pump assembly 6, reducing the capacity of the oil pump assembly 6, and thus reducing the installation cost.

[0036] In some embodiments, the stator branch oil passage 21 includes a stator end oil cavity 211 and a stator core oil passage 212. The stator end oil cavity 211 includes a first oil cavity 2111 and a second oil cavity 2112. The stator core oil passage 212 includes a core winding oil passage 2121 and a core yoke oil passage 2122. The core winding oil passage 2121 and the core yoke oil passage 2122 are respectively connected between the first oil cavity 2111 and the second oil cavity 2112. The first oil cavity 2111 is connected to the main oil passage 4, and the second oil cavity 2112 is connected to the rotor branch oil passage 22. The main oil passage 4 is connected to a control valve 41 and a radiator 42.

[0037] Specifically, the stator end oil cavity 211 is used to dissipate heat from the stator end winding 121, and the stator core oil passage 212 is used to dissipate heat from the stator core 122, such as... Figure 2 As shown, the stator end oil cavity 211 includes a first oil cavity 2111 and a second oil cavity 2112. The first oil cavity 2111 is used to dissipate heat from the winding at one end of the stator assembly 12, and the second oil cavity 2112 is used to dissipate heat from the winding at the other end of the stator assembly 12. The stator core oil circuit 212 includes a core winding oil circuit 2121 and a core yoke oil circuit 2122. The core winding oil circuit 2121 is used to dissipate heat from the winding inside the core, and the core yoke oil circuit 2122 is used to dissipate heat from the stator core 122.

[0038] The first oil chamber 2111 and the second oil chamber 2112 are located at both axial ends of the stator assembly 12. The core winding oil passage 2121 connects the first oil chamber 2111 and the second oil chamber 2112, and the core yoke oil passage 2122 connects the first oil chamber 2111 and the second oil chamber 2112. The first oil chamber 2111 is connected to the main oil passage 4, and the second oil chamber 2112 is connected to the rotor branch oil passage 22. Thus, the stator assembly 12 can be connected to the stator branch oil passage 21 through the first oil chamber 2111, the core winding oil passage 2121, the core yoke oil passage 2122, and the second oil chamber 2112. Furthermore, the first oil chamber 2111 is provided with an oil inlet 2113, which connects the first oil chamber 2111 to the main oil passage 4.

[0039] In practical use, the oil at the main oil passage 4 flows sequentially through the first oil chamber 2111, the core winding oil passage 2121, the core yoke oil passage 2122, and the second oil chamber 2112 before reaching the rotor branch oil passage 22, thus cooling the stator end winding 121 and the stator core 122. By setting the first oil chamber 2111 and the second oil chamber 2112, the stator end winding 121 can be cooled by immersion, improving the cooling effect of the stator end winding 121.

[0040] Among them, such as Figure 2 and Figure 3As shown, the first oil chamber 2111 is a closed oil chamber formed by the housing 11, the stator core 122, and the sealing oil ring 123. The second oil chamber 2112 is a closed oil chamber formed by the housing 11, the stator core 122, the sealing oil ring 123, and the housing end cover 111. Direct heat dissipation of the stator end winding 121 is achieved through the closed oil chambers. Furthermore, as... Figure 4 As shown, the core winding oil passage 2121 is located at the slot opening of the stator core 122. It is a closed oil passage formed by the closed slot core and insulating paper. The core winding oil passage 2121 is used to cool the internal windings of the core, achieving direct heat dissipation. The core yoke oil passage 2122 is a closed oil passage formed directly from the opening of the core lamination yoke. The core yoke oil passage 2122 is used for heat dissipation of the stator core 122. This structure allows for sufficient oil flow, improving the heat dissipation capacity of the stator end windings 121, the slot windings, and the stator core 122, thereby enhancing electric drive performance.

[0041] Furthermore, the main oil circuit 4 is connected to a control valve 41 and a radiator 42. The control valve 41 can be a temperature-controlled valve, which can automatically regulate the oil flow rate, and the radiator 42 has a heat dissipation function. The temperature-controlled valve and the radiator 42 can be connected sequentially to the main oil circuit 4, allowing the oil in the main oil circuit 4 to flow through the temperature-controlled valve and the radiator 42 before entering the first oil circuit 2 and the second oil circuit 3, etc. The housing 11 has an internal oil circuit, with the temperature-controlled valve inlet connected to the oil pump 62 outlet. Figure 1 As shown, the temperature control valve has a first oil outlet 411 and a second oil outlet 412. The first oil outlet 411 is connected to the oil inlet of the radiator 42 via an internal oil circuit, and the second oil outlet 412 is connected to the oil outlet of the radiator 42 via an internal oil circuit. In specific use, when the temperature of the cooling lubricating oil is lower than a certain threshold, the first oil outlet 411 of the temperature control valve is closed, and the cooling lubricating oil enters each branch oil circuit directly through the second oil outlet 412 without passing through the radiator 42. When the temperature of the cooling lubricating oil is higher than the certain threshold, the second oil outlet 412 of the temperature control valve is closed, and the cooling lubricating oil enters each branch oil circuit after being cooled by the radiator 42 through the first oil outlet 411. This function can ensure that the low-temperature cooling lubricating oil enters the stator assembly 12 and rotor assembly 13 directly without passing through the radiator 42 for heating, improving the heating efficiency of the cooling lubricating oil, improving the low-temperature lubrication state of the system, and improving lubrication reliability and efficiency.

[0042] In some embodiments, the rotor branch oil passage 22 includes a housing end cover oil passage 221 and a rotor shaft oil passage 222 distributed in series. The housing end cover oil passage 221 is connected to the second oil chamber 2112, and the rotor shaft oil passage 222 is provided with a rotor shaft 2221, a primary gear 142 and an oil pan 112 in sequence.

[0043] Specifically, the housing end cover oil passage 221 is used for oil to flow in the housing end cover 111, and the rotor shaft oil passage 222 is used for oil to flow in the rotor shaft 2221 to cool the rotor assembly 13. The housing 11 is connected to the housing end cover 111 at the end, and the housing end cover oil passage 221 is located in the housing end cover 111. One end of the housing end cover oil passage 221 is connected in series with the rotor shaft oil passage 222, and the other end of the housing end cover oil passage 221 is connected to the second oil chamber 2112. That is, the stator branch oil passage 21 and the rotor shaft oil passage 222 can be connected through the housing end cover oil passage 221.

[0044] In practical use, the oil in the second oil chamber 2112 flows into the rotor shaft oil passage 222 through the oil passage 221 of the housing end cover, which can supply oil to the rotor assembly 13. The rotor shaft oil passage 222 is provided with the rotor shaft 2221, the first-stage gear 142 and the oil pan 112 in sequence, which can cool the rotor core at the rotor shaft 2221 and lubricate the first-stage gear 142. The oil after lubricating the first-stage gear 142 flows back to the oil pan 112 from the built-in oil passage of the housing 11.

[0045] The housing end cover 111 is also connected to an end cover plate 118. The rotor shaft 2221 is provided with a sealing slip ring 131, which has a sealing function. The end cover plate 118 is provided with a cover plate oil passage. Lubricating and cooling oil flows into the rotor shaft oil passage 222 through the housing end cover oil passage 221 and the cover plate oil passage. The sealing slip ring 131 achieves sealing of the housing end cover oil passage 221, the cover plate oil passage, and the rotor shaft oil passage 222. The rotor shaft 2221 has an oil drain hole 2222 at its tail end. A primary gear oil passage 2223 is provided between the oil drain hole 2222 and the primary gear 142. When the rotor shaft 2221 rotates, the lubricating and cooling oil is drawn from the end of the rotor shaft 2221 to its tail end by centrifugal suction. After passing through the oil drain hole 2222 and the primary gear oil passage 2223, it is thrown onto the primary gear 142, thus lubricating and cooling the primary gear 142 and improving its lubrication capacity and lifespan. Simultaneously, a second stator oil drain hole 2212 is provided on the end cover plate 118 to allow some of the cooling and lubricating oil from the stator branch oil passage 21 to flow into the oil pan 112. A first stator oil drain hole 2211 is also provided on the end cover plate 118, which connects the second oil chamber 2112 to the end cover oil passage 221 of the housing.

[0046] Furthermore, the oil in the rotor shaft oil passage 222 can also flow along the rotor shaft 2221 axially to the bearing at the secondary gear 143, lubricating the bearing at the secondary gear 143, and the lubricated oil flows back to the oil pan 112.

[0047] In this way, by connecting the rotor branch oil circuit 22 and the stator branch oil circuit 21 in series, the cooling lubricating oil can be reused, reducing the flow rate of the oil pump 62, and reducing the power and cost of the oil pump 62.

[0048] In some embodiments, the first oil passage 2 further includes a half-shaft bearing branch oil passage 23, which is used to lubricate the half-shaft bearing 231. The half-shaft bearing branch oil passage 23 is distributed in parallel with the rotor shaft oil passage 222 and is connected between the housing end cover oil passage 221 and the oil pan 112.

[0049] Specifically, the half-shaft bearing branch oil passage 23 is connected to the half-shaft bearing 231 for lubricating the half-shaft bearing 231, and as such Figure 3 As shown, the half-shaft bearing branch oil passage 23 and the rotor shaft oil passage 222 are distributed in parallel and connected between the housing end cover oil passage 221 and the oil pan 112. That is, one end of the half-shaft bearing branch oil passage 23 is connected to the housing end cover oil passage 221 and the other end is connected to the oil pan 112, so that the half-shaft bearing branch oil passage 23 can be connected between the rotor branch oil passage 221 and the oil pan 112.

[0050] In practical use, a portion of the oil in the housing end cover oil passage 221 flows back to the oil pan 112 after passing through the half-shaft bearing branch oil passage 23, thus lubricating the half-shaft bearing 231. The remaining oil flows into the rotor shaft oil passage 222 and back to the oil pan 112, thus cooling the rotor assembly 13. By setting a branch oil passage between the housing end cover oil passage 221 and the rotor shaft oil passage 222, the lubrication and cooling of the half-shaft bearing 231 becomes more convenient.

[0051] In some embodiments, the second oil circuit 3 includes a reducer main oil circuit 31, a secondary gear oil circuit 32, a differential oil circuit 33, a reducer rear bearing oil circuit 34, and an oil seal oil circuit 35. The reducer main oil circuit 31 is connected to the main oil circuit 4. The secondary gear oil circuit 32, the differential oil circuit 33, the reducer rear bearing oil circuit 34, and the oil seal oil circuit 35 are distributed in parallel and are all connected in series between the reducer main oil circuit 31 and the oil pan 112.

[0052] Specifically, the reducer main oil circuit 31 is used to transport the oil from the main oil circuit 4 to the second oil circuit 3, the secondary gear oil circuit 32 is used to lubricate the secondary gear 143, the differential oil circuit 33 is used to lubricate the differential 144, the reducer rear bearing oil circuit 34 is used to lubricate and cool the reducer rear bearing 145, and the oil seal oil circuit 35 is used to lubricate and cool the oil seal 146. One end of the reducer main oil passage 31 is connected to the main oil passage 4, which allows the second oil passage 3 to connect with the main oil passage 4. The secondary gear oil passage 32, the differential oil passage 33, the reducer rear bearing oil passage 34, and the oil seal oil passage 35 are distributed in parallel and connected in series between the reducer main oil passage 31 and the oil pan 112. That is, one end of the secondary gear oil passage 32 is connected to the reducer main oil passage 31, and the other end is connected to the oil pan 112; one end of the differential oil passage 33 is connected to the reducer main oil passage 31, and the other end is connected to the oil pan 112; one end of the reducer rear bearing oil passage 34 is connected to the reducer main oil passage 31, and the other end is connected to the oil pan 112; one end of the oil seal oil passage 35 is connected to the reducer main oil passage 31, and the other end is connected to the oil pan 112.

[0053] In practical use, the oil at the main oil circuit 4 can enter the secondary gear oil circuit 32 through the reducer main oil circuit 31. The oil in the secondary gear oil circuit 32 is sprayed onto the secondary gear 143 to achieve lubrication and cooling. The oil can also enter the differential oil circuit 33 through the reducer main oil circuit 31 to achieve lubrication and cooling of the differential 144. Furthermore, the oil can enter the reducer rear bearing oil circuit 34 and oil seal oil circuit 35 through the reducer main oil circuit 31 to achieve lubrication and cooling of the reducer rear bearing 145 and oil seal 146. Thus, through the setting of the second oil circuit 3, the secondary gear 143, differential 144, reducer rear bearing 145 and oil seal 146 of the reducer 14 can be lubricated and cooled to ensure the structural safety and reliable operation of the reducer 14.

[0054] And such as Figure 2 As shown, the secondary gear 143 includes a secondary needle roller bearing 1431, which is connected to the secondary needle roller bearing oil passage 1432. The oil in the secondary gear oil passage 32 can flow to the secondary needle roller bearing oil passage 1432 to lubricate and cool the secondary needle roller bearing 1431.

[0055] Additionally, the housing 11 is connected to the reducer rear housing 141 on one side of the reducer 14. The secondary gear oil passage 32, differential oil passage 33, reducer rear bearing oil passage 34 and oil seal oil passage 35 can be located inside the reducer rear housing 141, and the reducer main oil passage 31 can be located inside the housing 11.

[0056] In some embodiments, such as Figure 5As shown, the housing 11 is provided with a first oil return hole 113 and a second oil return hole 114. Both the first oil return hole 113 and the second oil return hole 114 are connected to the oil pan 112. The secondary gear oil passage 32 and the differential oil passage 33 are connected to the first oil return hole 113. The reducer rear bearing oil passage 34 and the oil seal oil passage 35 are connected to the second oil return hole 114.

[0057] Specifically, both the first oil return hole 113 and the second oil return hole 114 are used for oil return. Connecting the first oil return hole 113 and the second oil return hole 114 to the oil pan 112 allows the oil at these holes to flow back into the oil pan 112. Furthermore, the secondary gear oil passage 32 and the differential oil passage 33 are connected to the first oil return hole 113, meaning that the secondary gear oil passage 32 and the differential oil passage 33 can be connected to the oil pan 112 through the first oil return hole 113. This allows the oil around the secondary gear 143 to pass through the first oil return hole. The oil flows into the oil pan 112 through the hole 113, preventing oil accumulation at the secondary gear 143 and reducing oil churning losses at the secondary gear 143. Additionally, the oil passage 34 of the reducer's rear bearing and the oil seal passage 35 are connected to the second return oil hole 114. This allows the oil passage 34 of the reducer's rear bearing and the oil seal passage 35 to connect to the oil pan 112 via the second return oil hole 114. Consequently, the oil from the reducer's rear bearing 145, oil seal 146, and their surroundings flows into the oil pan 112 through the second return oil hole 114, preventing oil accumulation at the reducer's rear bearing 145 and oil seal 146.

[0058] Thus, by setting the first oil return hole 113 and the second oil return hole 114, the oil in the secondary gear 143, differential 144, gear rear bearing and oil seal 146 can flow back to the oil pan 112 quickly, reducing the oil churning loss in the secondary gear 143, differential 144 and connecting shaft, and improving system performance.

[0059] Oil nozzles are provided at the corresponding positions of the rear bearing 145 of the reducer and the differential 144 to spray oil towards the rear bearing 145 of the reducer and the differential 144, thereby achieving cooling and lubrication of the rear bearing 145 of the reducer and the differential 144.

[0060] Furthermore, the housing 11 is also provided with a third oil return hole 119, which can transport the oil at the first-stage gear 142 to the oil pan 112, thereby improving the oil return efficiency at the first-stage gear 142, reducing the oil churning loss of the first-stage gear 142, and improving the system performance.

[0061] In some embodiments, the electric drive cooling and lubrication system 100 further includes a bearing oil passage 5, which is located inside the housing 11. The bearing oil passage 5 includes a main bearing oil passage 51, a front bearing oil passage 52 of the motor, a front bearing oil passage 53 of the reducer, and a rear bearing oil passage 54 of the motor. The main bearing oil passage 51 is connected to the main oil passage 4. The front bearing oil passage 52 of the motor, the front bearing oil passage 53 of the reducer, and the rear bearing oil passage 54 of the motor are distributed in parallel and are all connected in series between the main bearing oil passage 51 and the oil pan 112.

[0062] Specifically, the bearing oil circuit 5 is used to lubricate and cool some bearings of the electric drive structure 1. The bearing oil circuit 5 is located inside the housing 11, that is, the bearing oil circuit 5 can be arranged and fixed through the housing 11. Among them, the main bearing oil circuit 51 is used to transport the oil from the main oil circuit 4 to the bearing oil circuit 5. The front bearing oil circuit 52 of the motor is used to lubricate and cool the front bearing 55 of the motor. The front bearing oil circuit 53 of the reducer is used to lubricate and cool the front bearing 147 of the reducer. The rear bearing oil circuit 54 of the motor is used to lubricate and cool the rear bearing 56 of the motor. One end of the bearing main oil passage 51 is connected to the main oil passage 4, which allows the bearing oil passage 5 to be connected to the main oil passage 4. The motor front bearing oil passage 52, the reducer front bearing oil passage 53, and the motor rear bearing oil passage 54 are distributed in parallel and connected in series between the bearing main oil passage 51 and the oil pan 112. That is, one end of the motor front bearing oil passage 52 is connected to the bearing main oil passage 51, and the other end is connected to the oil pan 112; one end of the reducer front bearing oil passage 53 is connected to the bearing main oil passage 51, and the other end is connected to the oil pan 112; one end of the motor rear bearing oil passage 54 is connected to the bearing main oil passage 51, and the other end is connected to the oil pan 112.

[0063] In practical use, the oil at the main oil circuit 4 can enter the front bearing oil circuit 52 of the motor through the main bearing oil circuit 51 to lubricate and cool the front bearing 55 of the motor. The oil can also enter the front bearing oil circuit 53 of the reducer through the main bearing oil circuit 51 to lubricate and cool the front bearing 147 of the reducer. Furthermore, the oil can enter the rear bearing oil circuit 54 of the motor through the main bearing oil circuit 51 to lubricate and cool the rear bearing 56 of the motor. Thus, by setting up the bearing oil circuit 5, the front bearing 55 of the motor, the front bearing 147 of the reducer, and the rear bearing 56 of the motor can be lubricated and cooled to ensure the safe and reliable operation of the rotor assembly 13 and the reducer 14 shaft.

[0064] And such as Figure 2 and Figure 3 As shown, the front bearing 147 and the first-stage gear 142 of the reducer are distributed along the axial direction of the rotor shaft 2221. The first-stage gear 142 includes a first-stage needle roller bearing 1421, which is connected to the first-stage needle roller bearing oil passage 51422. The oil at the front bearing oil passage 53 of the reducer can flow to the first-stage needle roller bearing oil passage 51422 to lubricate and cool the first-stage needle roller bearing 1421.

[0065] In some embodiments, such as Figure 2 As shown, the housing 11 has a first bearing oil return hole 115 at the front bearing 55 of the motor and the front bearing 147 of the reducer. The oil passage 52 of the front bearing of the motor and the oil passage 53 of the front bearing of the reducer are connected to the oil pan 112 through the first bearing oil return hole 115. The housing 11 has a second bearing oil return hole 116 at the rear bearing 56 of the motor. The oil passage 54 of the rear bearing of the motor is connected to the oil pan 112 through the second bearing oil return hole 116.

[0066] Specifically, the first bearing oil return hole 115 and the second bearing oil return hole 116 are both used for oil return. The motor front bearing oil passage 52 and the reducer front bearing oil passage 53 are connected to the oil pan 112 through the first bearing oil return hole 115. That is, the first bearing oil return hole 115 is located downstream of the motor front bearing oil passage 52 and the reducer front bearing oil passage 53. Through the first bearing oil return hole 115, the oil in the motor front bearing oil passage 52 and the reducer front bearing oil passage 53 can flow back to the oil pan 112, and the cooling lubricant splashed into the air gap of the stator assembly 12 and the rotor assembly 13 can flow back to the oil pan 112 as soon as possible.

[0067] Furthermore, the housing 11 has a second bearing oil return hole 116 at the rear bearing 56 of the motor. The rear bearing oil passage 54 of the motor is connected to the oil pan 112 through the second bearing oil return hole 116. That is, the second bearing oil return hole 116 is located downstream of the rear bearing oil passage 54 of the motor. Figure 6 As shown, the bottom of the housing 11 is provided with a motor rear end oil return hole 117 between the second bearing oil return hole 116 and the oil pan 112. In this way, the oil in the motor rear bearing oil passage 54 flows back to the oil pan 112 through the first bearing oil return hole 115 and the motor rear end oil return hole 117 in sequence, and can quickly return the cooling lubricant splashed into the air gap of the stator assembly 12 and the rotor assembly 13 to the oil pan 112.

[0068] Thus, by setting the first bearing oil return hole 115 and the second bearing oil return hole 116, the cooling lubricant in the air gap of the stator assembly 12 and the rotor assembly 13 can quickly flow back to the oil pan 112, avoiding the increase of oil churning loss due to oil accumulation in the air gap and improving system performance.

[0069] The present invention also proposes a vehicle.

[0070] The vehicle according to the present invention includes the electric drive cooling and lubrication system 100 of any of the above embodiments. The electric drive cooling and lubrication system 100 is used to cool and lubricate the electric drive structure 1. Applying the electric drive cooling and lubrication system 100 to the vehicle can meet the reliability and stability requirements of the electric drive structure 1 in the vehicle. The electric drive cooling and lubrication system 100 includes an electric drive structure 1, a first oil passage 2, a second oil passage 3, and a main oil passage 4. By setting the stator assembly 12 and the rotor assembly 13 in series in the first oil passage 2, the oil in the first oil passage 2 can pass through the stator assembly 12 and the rotor assembly 13 in sequence, thereby achieving sequential cooling of the stator assembly 12 and the rotor assembly 13. The second oil passage 3 is distributed in parallel with the first oil passage 2 and is connected in series in the main oil passage 4, which realizes the diversion of oil flow. It can cool and lubricate the structures in the first oil passage 2 and the second oil passage 3 respectively, meeting the cooling and lubrication requirements of the electric drive structure 1. Furthermore, the stator assembly 12 and the rotor assembly 13 share a single oil passage, reducing the total number of parallel oil passages and reducing the capacity of the oil pump assembly 6, thereby reducing the installation cost.

[0071] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric drive cooling and lubrication system, characterized in that, include: An electric drive structure, comprising a housing, a stator assembly, a rotor assembly, and a reducer, wherein the stator assembly, the rotor assembly, and the reducer are all mounted within the housing; The system comprises a first oil circuit, a second oil circuit, and a main oil circuit. The main oil circuit is connected to the oil pan via an oil pump assembly. The stator assembly and the rotor assembly are connected in series in the first oil circuit so that the oil in the first oil circuit passes sequentially through the stator assembly and the rotor assembly. The reducer is located in the second oil circuit so that the oil in the second oil circuit passes through the reducer. The first oil circuit and the second oil circuit are connected in parallel and are both connected in series with the main oil circuit.

2. The electric drive cooling and lubrication system according to claim 1, characterized in that, The first oil circuit includes a stator branch oil circuit and a rotor branch oil circuit, which are connected in series. The stator branch oil circuit is connected to the main oil circuit, and the rotor branch oil circuit is connected to the oil pan.

3. The electric drive cooling and lubrication system according to claim 2, characterized in that, The stator branch oil circuit includes a stator end oil cavity and a stator core oil circuit. The stator end oil cavity includes a first oil cavity and a second oil cavity. The stator core oil circuit includes a core winding oil circuit and a core yoke oil circuit. The core winding oil circuit and the core yoke oil circuit are respectively connected between the first oil cavity and the second oil cavity. The first oil cavity is connected to the main oil circuit, and the second oil cavity is connected to the rotor branch oil circuit. The main oil circuit is connected to a control valve and a radiator.

4. The electric drive cooling and lubrication system according to claim 2, characterized in that, The rotor branch oil circuit includes a housing end cover oil circuit and a rotor shaft oil circuit distributed in series. The housing end cover oil circuit is connected to the second oil chamber. The rotor shaft oil circuit has a rotor shaft, a primary gear and an oil pan distributed in sequence.

5. The electric drive cooling and lubrication system according to claim 4, characterized in that, The first oil circuit also includes a half-shaft bearing branch oil circuit, which is used to lubricate the half-shaft bearing. The half-shaft bearing branch oil circuit is distributed in parallel with the rotor shaft oil circuit and is connected between the housing end cover oil circuit and the oil pan.

6. The electric drive cooling and lubrication system according to claim 1, characterized in that, The second oil circuit includes a main reducer oil circuit, a secondary gear oil circuit, a differential oil circuit, a reducer rear bearing oil circuit, and an oil seal oil circuit. The main reducer oil circuit is connected to the main oil circuit. The secondary gear oil circuit, the differential oil circuit, the reducer rear bearing oil circuit, and the oil seal oil circuit are distributed in parallel and are all connected in series between the main reducer oil circuit and the oil pan.

7. The electric drive cooling and lubrication system according to claim 6, characterized in that, The housing is provided with a first oil return hole and a second oil return hole, both of which are connected to the oil pan. The secondary gear oil circuit and the differential oil circuit are connected to the first oil return hole, and the reducer rear bearing oil circuit and the oil seal oil circuit are connected to the second oil return hole.

8. The electric drive cooling and lubrication system according to claim 1, characterized in that, It also includes a bearing oil circuit, which is located inside the housing. The bearing oil circuit includes a main bearing oil circuit, a front bearing oil circuit of the motor, a front bearing oil circuit of the reducer, and a rear bearing oil circuit of the motor. The main bearing oil circuit is connected to the main oil circuit. The front bearing oil circuit of the motor, the front bearing oil circuit of the reducer, and the rear bearing oil circuit of the motor are distributed in parallel and are all connected in series between the main bearing oil circuit and the oil pan.

9. The electric drive cooling and lubrication system according to claim 8, characterized in that, The housing is provided with a first bearing oil return hole at the front bearing of the motor and the front bearing of the reducer. The oil circuit of the front bearing of the motor and the oil circuit of the front bearing of the reducer are connected to the oil pan through the first bearing oil return hole. The housing is provided with a second bearing oil return hole at the rear bearing of the motor. The oil circuit of the rear bearing of the motor is connected to the oil pan through the second bearing oil return hole.

10. A vehicle, characterized in that, The electric drive cooling and lubrication system includes any one of claims 1-9.

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