A housing assembly, an electric drive system, and a vehicle

Abstract

The utility model provides a kind of shell assembly, electric drive system and vehicle, it is related to vehicle technical field, shell assembly includes detachable connection and respectively for installing the first shell and second shell of reducer and motor, first shell is equipped with for with the first oil way of the oil outlet of oil cooler and for extending to the second oil way of reduction gear, second shell is equipped with for extending to the third oil way of rotor shaft inside and for extending to the fourth oil way of stator winding, the junction of first shell and second shell is equipped with main oil way, and first oil way, second oil way, third oil way and fourth oil way are communicated with main oil way respectively, lubricating oil that flows out from oil cooler after flowing into main oil way by first oil way, respectively by second oil way, third oil way and fourth oil way flow to reduction gear, the inside of rotor shaft and stator winding.This not only makes that oil way arrangement is more compact, can also reduce the length and quantity of oil way, reduce the processing difficulty and cost of shell assembly.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and more specifically, to a housing assembly, an electric drive system, and a vehicle. Background Technology

[0002] As the motor speed of new energy electric vehicles increases, the demand for reducer efficiency also increases, which requires more efficient and precise oil distribution for the lubrication and cooling of the electric drive system.

[0003] Currently, commercially available electric drive systems typically use external oil pipes to guide lubricating oil to components such as bearings, motors, and gears, or they use a complex and dispersed array of tubular oil channels on the housing to deliver lubricating oil to these components. This not only occupies a large amount of space but also increases the difficulty and cost of manufacturing the housing. Utility Model Content

[0004] The problem this invention solves is: how to reduce the space required for the lubrication oil circuit of an electric drive system and reduce the processing difficulty of the electric drive system housing.

[0005] To address the aforementioned problems, this utility model provides a housing assembly, an electric drive system, and a vehicle.

[0006] In a first aspect, this utility model provides a housing assembly, including a detachably connected first housing and a second housing. The internal spaces of the first housing and the second housing are respectively used to install a reducer and a motor. The first housing is provided with a first oil passage for communicating with the oil outlet of an oil cooler and a second oil passage for extending to the reduction gear. The second housing is provided with a third oil passage for extending to the interior of the rotor shaft and a fourth oil passage for extending to the stator winding. A main oil passage is provided at the connection between the first housing and the second housing, and the first oil passage, the second oil passage, the third oil passage, and the fourth oil passage are respectively connected to the main oil passage. Lubricating oil flowing out of the oil cooler flows into the main oil passage through the first oil passage, and then flows to the reduction gear, the interior of the rotor shaft, and the stator winding through the second oil passage, the third oil passage, and the fourth oil passage, respectively.

[0007] Optionally, an oil groove is provided on the end face of the first housing facing the second housing and / or the end face of the second housing facing the first housing. The oil groove is arranged along the circumference of the second housing and constitutes the main oil passage.

[0008] Optionally, the first oil passage and the third oil passage are respectively connected to one end of the oil tank along the circumference of the second housing, and / or the fourth oil passage is located at the top of the second housing and is connected to the other end of the oil tank along the circumference of the second housing.

[0009] Optionally, the internal space of the first housing is also used to install a differential. The first housing is also provided with a fifth oil passage, which is connected to the first oil passage and is used to extend to the differential gear. The lubricating oil flowing out from the oil cooler flows into the first oil passage and is divided into two paths: one path flows through the fifth oil passage to the differential gear, and the other path flows into the main oil passage.

[0010] Optionally, the first housing includes a first housing body and an intermediate housing portion. The first housing body is detachably connected to the side of the intermediate housing portion opposite to the second housing. The first oil passage includes a first oil channel disposed on the first housing body and a second oil channel disposed on the intermediate housing portion. The first oil channel, the second oil channel and the main oil passage are sequentially connected, and the first oil channel is used to communicate with the oil outlet of the oil cooler.

[0011] Optionally, the second housing includes a second housing body and an end cap, and the third oil passage includes a third oil channel and a fourth oil channel that are interconnected. The third oil channel is disposed on the outer peripheral wall of the second housing body and is connected to the main oil passage. The fourth oil channel is disposed on the end cap and is used to extend from one end of the rotor shaft to the internal space of the rotor shaft.

[0012] Optionally, the housing assembly further includes a seal, through which the connection between the first housing and the second housing is sealed.

[0013] Optionally, a sealing groove is provided at the connection between the first housing and the second housing. The sealing groove includes a first annular groove and a second annular groove. The first annular groove is arranged around the main oil passage, and the second annular groove is arranged around the opening of the second housing facing the first housing. The sealing element is provided in the first annular groove and the second annular groove.

[0014] Secondly, this utility model provides an electric drive system, including the housing assembly as described above.

[0015] Secondly, this utility model provides a vehicle including the electric drive system described above.

[0016] The beneficial effects of the housing assembly of this utility model are: by detachably connecting the first housing for mounting the reducer and the second housing for mounting the motor, the reducer and the motor can be integrated and installed together, realizing the integrated design of the electric drive system; moreover, by providing a first oil passage for communicating with the oil outlet of the oil cooler and a second oil passage for extending to the reduction gear on the first housing, and a third oil passage for extending to the inside of the rotor shaft and a fourth oil passage for extending to the stator winding on the second housing, and by providing a main oil passage at the connection between the first housing and the second housing, the first oil passage and the second oil passage can be connected together. The first, third, and fourth oil passages are connected to the main oil passage, so that the lubricating oil flowing from the oil cooler flows into the main oil passage through the first oil passage and then splits into three branches. The first branch flows to the reduction gear through the second oil passage to cool and lubricate the reduction gear. The second branch flows to the inside of the rotor shaft through the third oil passage so that the lubricating oil flowing from the end of the rotor shaft can cool and lubricate the motor rotor and the spline between the motor rotor and the rotor shaft. At the same time, the radial holes on the rotor shaft are used to cool and lubricate the motor bearings sleeved at both ends of the rotor shaft. The third branch flows to the stator winding through the fourth oil passage to cool the stator winding. Compared to related technologies that use external oil pipes to guide lubricating oil to components such as bearings, motors, and gears, or that use a complex and dispersed array of tubular oil channels on the housing to deliver lubricating oil to these components, this method of using the main oil passage at the mating surface of the reducer housing and motor housing to divert the lubricating oil not only reduces the length and number of oil passages, lowers oil pressure loss, and reduces the processing difficulty and cost of the housing assembly, but also makes the oil passage layout more compact and occupies less space. Furthermore, by using the second, third, and fourth oil passages to actively distribute the lubricating oil to components such as reduction gears, rotor shafts, and stator windings for cooling and lubrication, the dynamic oil level within the housing assembly can be effectively controlled, reducing the risk of oil churning in the reducer and thus improving the reducer's operating efficiency. Attached Figure Description

[0017] Figure 1 This is an exploded structural diagram of the housing assembly in an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the assembly structure of the housing assembly in an embodiment of the present utility model;

[0019] Figure 3 This is a cross-sectional schematic diagram of the electric drive system in an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the middle shell portion facing away from the second shell in an embodiment of the present utility model;

[0021] Figure 5This is a schematic diagram of the structure of the middle shell portion facing the second shell in an embodiment of the present invention;

[0022] Figure 6 for Figure 5 Schematic diagram of the cross section at point AA;

[0023] Figure 7 for Figure 5 Schematic diagram of the cross section at point BB;

[0024] Figure 8 This is a three-dimensional structural diagram of the second shell in an embodiment of the present utility model;

[0025] Figure 9 This is a structural schematic diagram of the second housing from another perspective in an embodiment of this utility model;

[0026] Figure 10 This is a cross-sectional view of the second housing at the fourth oil passage in an embodiment of the present invention;

[0027] Figure 11 This is a cross-sectional view of the end cap at the fourth oil passage in an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. First housing; 11. First housing body; 12. Intermediate housing section; 2. Second housing; 21. Second housing body; 22. End cap; 23. Oil groove; 24. Sealing groove; 241. First annular groove; 242. Second annular groove; 31. First oil passage; 311. First oil channel; 312. Second oil channel; 32. Second oil passage; 33. Third oil passage; 331. Third oil channel; 332. Fourth oil channel; 34. Fourth oil passage; 35. Fifth oil passage; 36. Main oil passage; 4. Seal; 41. First sealing part; 42. Second sealing part; 5. Oil injection pipe; 500. Oil cooler; 600. Reduction gear; 700. Rotor shaft; 800. Stator winding; 900. Intermediate bearing. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0031] In the attached figures, the X-axis represents the front-to-back position, with the positive direction of the X-axis representing the front and the negative direction representing the rear. The Y-axis represents the left-to-right position, with the positive direction representing the left and the negative direction representing the right. The Z-axis represents the up-down position, with the positive direction representing the top and the negative direction representing the bottom. It should be noted that the aforementioned representations of the X, Y, and Z axes are for ease of description and simplification of the invention, 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. Therefore, they should not be construed as limitations on the invention.

[0032] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0033] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0034] In related technologies, commercially available electric drive systems typically use external oil pipes to guide lubricating oil to components such as bearings, motors, and gears, or use a complex and dispersed array of tubular oil channels on the housing to deliver lubricating oil to components such as bearings, motors, and gears. This not only occupies a large amount of space but also increases the difficulty and cost of manufacturing the housing.

[0035] To address the problems existing in the aforementioned related technologies, this utility model provides a housing assembly, an electric drive system, and a vehicle.

[0036] Combination Figures 1 to 5As shown, a housing assembly according to an embodiment of the present invention includes a first housing 1 and a second housing 2 that are detachably connected. The internal spaces of the first housing 1 and the second housing 2 are used to install a reducer and a motor, respectively. The first housing 1 is provided with a first oil passage 31 for communicating with the oil outlet of the oil cooler 500 and a second oil passage 32 for extending to the reduction gear 600. The second housing 2 is provided with a third oil passage 33 for extending to the interior of the rotor shaft 700 and a fourth oil passage 34 for extending to the stator winding 800. A main oil passage 36 is provided at the connection between the first housing 1 and the second housing 2, and the first oil passage 31, the second oil passage 32, the third oil passage 33 and the fourth oil passage 34 are respectively connected to the main oil passage 36. The lubricating oil flowing out of the oil cooler 500 flows into the main oil passage 36 through the first oil passage 31, and then flows to the interior of the reduction gear 600, the rotor shaft 700 and the stator winding 800 through the second oil passage 32, the third oil passage 33 and the fourth oil passage 34, respectively.

[0037] Specifically, since the reducer is installed inside the first housing 1 and the motor is installed inside the second housing 2, the first housing 1 can be called the reducer housing, and the second housing 2 can be called the motor housing. The reducer housing and the motor housing are integrated together to form a housing assembly. Furthermore, since the reducer housing and the motor housing are usually connected at their end faces, the connection point between the reducer housing and the motor housing is also the mating surface of the reducer housing and the motor housing. Specifically, the end face of the reducer housing facing the motor housing is also the mating surface of the reducer housing, and the end face of the motor housing facing the reducer housing is also the mating surface of the motor housing. Meanwhile, the first housing 1 has a first oil passage 31 and a second oil passage 32 inside its shell wall, and the second housing 2 has a third oil passage 33 and a fourth oil passage 34 inside its shell wall. The first housing 1 and the second housing 2 have a main oil passage 36 at their mating surfaces. The first oil passage 31 is used to connect with the oil outlet of the oil cooler 500, the second oil passage 32 is used to extend to the reduction gear 600, the third oil passage 33 is used to extend to the interior of the rotor shaft 700, and the fourth oil passage 34 is used to extend to the stator winding 800. Moreover, the first oil passage 31, the second oil passage 32, the third oil passage 33, and the fourth oil passage 34 are respectively connected to the main oil passage 36, so that the lubricating oil flowing out of the oil cooler 500 flows into the main oil passage 36 through the first oil passage 31 and is divided into three branches. The first branch flows to the reduction gear 600 through the second oil passage 32, the second branch flows to the interior of the rotor shaft 700 through the third oil passage 33, and the third branch flows to the stator winding 800 through the fourth oil passage 34.

[0038] In this embodiment, the first housing 1 for mounting the reducer and the second housing 2 for mounting the motor can be detachably connected to facilitate the integrated installation of the reducer and the motor, thus achieving an integrated design of the electric drive system. Furthermore, by providing a first oil passage 31 for communicating with the oil outlet of the oil cooler 500 and a second oil passage 32 extending to the reduction gear 600 on the first housing 1, and a third oil passage 33 extending to the interior of the rotor shaft 700 and a fourth oil passage 34 extending to the stator winding 800 on the second housing 2, and by providing a main oil passage 36 at the connection between the first housing 1 and the second housing 2, the first oil passage 31, the second oil passage 32, the third oil passage 33, and the fourth oil passage 34 are connected. The oil passage 34 is connected to the main oil passage 36, so that the lubricating oil flowing out of the oil cooler 500 flows into the main oil passage 36 through the first oil passage 31 and then splits into three branches. The first branch flows to the reduction gear 600 through the second oil passage 32 to cool and lubricate the reduction gear 600. The second branch flows to the inside of the rotor shaft 700 through the third oil passage 33 so that the lubricating oil flowing out from the end of the rotor shaft 700 can cool and lubricate the motor rotor and the spline between the motor rotor and the rotor shaft 700. At the same time, the radial holes on the rotor shaft 700 are used to cool and lubricate the motor bearings sleeved at both ends of the rotor shaft 700. The third branch flows to the stator winding 800 through the fourth oil passage 34 to cool the stator winding 800. Compared to related technologies that use external oil pipes to guide lubricating oil to components such as bearings, motors, and gears, or use a complex and dispersed array of tubular oil channels on the housing to deliver lubricating oil to these components, this method of using the main oil passage 36 at the junction of the reducer housing and motor housing to divert lubricating oil not only reduces the length and number of oil passages, lowers oil pressure loss, and reduces the processing difficulty and cost of the housing assembly, but also makes the oil passage layout more compact and occupies less space. Furthermore, by using the second oil passage 32, the third oil passage 33, and the fourth oil passage 34 to actively distribute lubricating oil to components such as the reduction gear 600, the rotor shaft 700, and the stator winding 800 for cooling and lubrication, the dynamic oil level in the housing assembly can be effectively controlled, reducing the risk of oil churning in the reducer and thus improving the reducer's working efficiency.

[0039] Optionally, combined Figure 8 and Figure 9 As shown, an oil groove 23 is provided on the end face of the first housing 1 facing the second housing 2 and / or the end face of the second housing 2 facing the first housing 1. The oil groove 23 is arranged along the circumference of the second housing 2 and forms the main oil passage 36.

[0040] It should be noted that the end face of the first housing 1 facing the second housing 2 is the mating surface of the first housing 1, and the end face of the second housing 2 facing the first housing 1 is the mating surface of the second housing 2.

[0041] In this optional embodiment, the second housing 2 is a cylindrical structure with one end open. An oil groove 23 is arranged circumferentially on the mating surface of the first housing 1 and / or the second housing 2, i.e., the oil groove 23 is approximately an arc-shaped groove structure. Specifically, the oil groove 23 can be provided only on the mating surface of the first housing 1, in which case the groove wall of the oil groove 23 and the mating surface of the second housing 2 enclose the main oil passage 36; alternatively, the oil groove 23 can be provided only on the mating surface of the second housing 2, in which case the groove wall of the oil groove 23 and the mating surface of the first housing 1 enclose the main oil passage 36; or, the oil groove 23 can be provided on both the mating surfaces of the first housing 1 and the second housing 2, in which case the two oil grooves 23 combine to form the main oil passage 36 after the first housing 1 and the second housing 2 are assembled. The design can be selected according to actual needs in practical applications. In this way, by machining the oil groove 23 on the mating surface of the first housing 1 and / or the second housing 2 as the main oil passage 36, not only can the machining difficulty of the main oil passage 36 and even the housing assembly be reduced, but the axial dimension of the housing assembly can also be shortened, making the structure of the housing assembly more compact. In addition, by arranging the oil groove 23 along the circumference of the second housing 2, the machining convenience of the oil groove 23 can be improved, and the extension range of the oil groove 23 can be increased, so that the first oil passage 31, the second oil passage 32, the third oil passage 33 and the fourth oil passage 34 located at different positions in the housing assembly can all be connected to the main oil passage 36.

[0042] Optionally, combined Figure 5 and Figure 8 As shown, the first oil passage 31 and the third oil passage 33 are respectively connected to one end of the oil tank 23 along the circumference of the second housing 2, and / or, the fourth oil passage 34 is located at the top of the second housing 2 and is connected to the other end of the oil tank 23 along the circumference of the second housing 2.

[0043] In this optional embodiment, the arc-shaped oil groove 23 has a first end and a second end at its two ends in the circumferential direction of the second housing 2, and the second end of the oil groove 23 is located above the first end and at the top of the second housing body 21; wherein, the first oil passage 31 and the third oil passage 33 are respectively connected to the first end of the oil groove 23, and / or, the fourth oil passage 34 is connected to the second end of the oil groove 23; and the second oil passage 32 is connected to the portion between the first end and the second end of the oil groove 23. In this way, by connecting the first oil passage 31 and the third oil passage 33 to one end of the oil tank 23 along the circumference of the second housing 2, the first oil passage 31 and the third oil passage 33 are arranged approximately opposite each other at the first end of the oil tank 23. This shortens the oil passage length between the oil outlet of the first oil passage 31 and the oil inlet of the third oil passage 33, reducing the oil resistance of lubricating oil flowing from the main oil passage 36 into the third oil passage 33. By setting the fourth oil passage 34 at the top of the second housing 2, lubricating oil can flow downward from the fourth oil passage 34 to the stator winding 800 for spray cooling. At the same time, by connecting the fourth oil passage 34 to the other end of the oil tank 23 along the circumference of the second housing 2, the circumferential length of the oil tank 23 along the second housing 2 is limited to the oil inlet of the third oil passage 33 and the fourth oil passage 34. This ensures that the main oil passage 36 formed by the oil tank 23 can be connected to each oil passage, while also reducing the circumferential length of the main oil passage 36, thereby reducing the oil resistance.

[0044] Optionally, combined Figure 4 , Figure 5 and Figure 7 As shown, the internal space of the first housing 1 is also used to install the differential. The first housing 1 is also provided with a fifth oil passage 35, which is connected to the first oil passage 31 and extends to the differential gear. The lubricating oil flowing out of the oil cooler 500 flows into the first oil passage 31 and is divided into two paths: one path flows through the fifth oil passage 35 to the differential gear, and the other path flows into the main oil passage 36. In this way, for the housing assembly that integrates the differential, by providing the fifth oil passage 35 on the first housing 1, the lubricating oil can be led to the differential gear through the fifth oil passage 35 to achieve active lubrication and cooling of the differential gear.

[0045] Optionally, combined Figures 1 to 3 As shown, the first housing 1 includes a first housing body 11 and an intermediate housing part 12. The first housing body 11 is detachably connected to the side of the intermediate housing part 12 away from the second housing 2. The first oil passage 31 includes a first oil channel 311 provided on the first housing body 11 and a second oil channel 312 provided on the intermediate housing part 12. The first oil channel 311, the second oil channel 312 and the main oil passage 36 are connected in sequence, and the first oil channel 311 is used to connect with the oil outlet of the oil cooler 500.

[0046] In this optional embodiment, the first housing 1 is a split structure, comprising a first housing body 11 and an intermediate housing portion 12. The first housing body 11 is detachably mounted to the side of the intermediate housing portion 12 opposite to the second housing 2 using fasteners such as bolts. The main oil passage 36 is located at the connection between the intermediate housing portion 12 and the second housing 2. Furthermore, a portion of the first oil passage 31 is located on the first housing body 11, and another portion is located on the intermediate housing portion 12. Specifically, the first oil channel 311 of the first oil passage 31 is located on the outer peripheral wall of the first housing body 11, and the second oil channel 312 of the first oil passage 31 is located on the outer peripheral wall of the intermediate housing portion 12. In this way, by designing the first housing 1 as a split structure comprising the first housing body 11 and the intermediate housing portion 12, the structure of the production mold for the first housing 1 can be simplified, thereby reducing the production difficulty and cost of the first housing 1. Meanwhile, by setting the first oil passage 311 on the outer peripheral wall of the first shell body 11 and setting the second oil passage 312 on the outer peripheral wall of the intermediate shell part 12, it is easier to process the first oil passage 31 in sections on the first shell 1 with a split structure, thereby reducing the processing difficulty of the first oil passage 31.

[0047] Furthermore, combined Figure 3 As shown, the first oil passage 311 and the second oil passage 312 are arranged flush along the axial direction. Compared with the first oil passage 311 and the second oil passage 312 being arranged obliquely on the outer peripheral walls of the first shell body 11 and the intermediate shell part 12 respectively, this not only simplifies the processing technology of the first oil passage 31, but also reduces the oil passage length of the first oil passage 31 and lowers the oil resistance.

[0048] Furthermore, combined Figure 4 , Figure 5 and Figure 6 As shown, the oil outlet of the second oil passage 32 is equipped with an oil injection pipe 5, which extends to the reduction gear 600 and the intermediate bearing 900. In this way, by using the oil injection pipe 5 to guide the lubricating oil to the reduction gear 600 and the intermediate bearing 900 for cooling and lubrication, the length of the oil passage 32 can be reduced, thereby further reducing the oil pressure loss and the processing difficulty and cost of the housing.

[0049] Optionally, combined Figures 1 to 3 As shown, the second housing 2 includes a second housing body 21 and an end cap 22. The end cap 22 is detachably connected to the side of the second housing body 21 away from the first housing 1. The third oil passage 33 includes a third oil channel 331 and a fourth oil channel 332 that are interconnected. The third oil channel 331 is disposed on the outer peripheral wall of the second housing body 21 and is connected to the main oil passage 36. The fourth oil channel 332 is disposed on the end cap 22 and is used to extend from one end of the rotor shaft 700 to the internal space of the rotor shaft 700.

[0050] In this optional embodiment, the second housing 2 is a split structure, comprising a second housing body 21 and an end cap 22. The end cap 22 is detachably mounted on the side of the second housing body 21 away from the first housing 1 using fasteners such as bolts. The main oil passage 36 is located at the connection between the second housing body 21 and the intermediate housing portion 12. Furthermore, a portion of the third oil passage 33 is located on the second housing body 21, and another portion is located on the end cap 22. Specifically, the third oil passage 331 of the third oil passage 33 is located on the outer peripheral wall of the second housing body 21, and the fourth oil passage 332 of the third oil passage 33 is located on the end cap 22. The third oil passage 33 extends from one circumferential end of the end cap 22 to the center of the end cap 22, and then extends axially from one end of the rotor shaft 700 to the internal space of the rotor shaft 700. This allows the third oil passage 33 to introduce lubricating oil into the interior of the rotor shaft 700, thereby achieving cooling and lubrication of the motor rotor, motor bearings, and splines between the motor rotor and the rotor shaft 700. In this way, by designing the second housing 2 as a split structure comprising the second housing body 21 and the end cap 22, the structure of the production mold for the second housing 2 can be simplified, thereby reducing the production difficulty and cost of the second housing 2. Simultaneously, by placing the third oil passage 331 on the outer peripheral wall of the second housing body 21 and the fourth oil passage 332 on the end cap 22, it is possible to process the third oil passage 33 in segments on the split structure of the second housing 2, thereby reducing the processing difficulty of the third oil passage 33.

[0051] Furthermore, combined Figure 3 As shown, the third oil passage 331 extends axially. Compared with setting the third oil passage 331 obliquely on the outer peripheral wall of the second shell body 21, this not only simplifies the processing of the third oil passage 331, but also reduces the oil passage length of the third oil passage 331 and reduces oil resistance.

[0052] Optionally, combined Figure 1 and Figure 3 As shown, the housing assembly also includes a seal 4, which seals the connection between the first housing 1 and the second housing 2. This improves the sealing performance of the main oil passage 36 located at the connection between the first housing 1 and the second housing 2, reducing the risk of oil leakage from the main oil passage 36.

[0053] Optionally, combined Figure 1 , Figure 8 and Figure 9 As shown, a sealing groove 24 is also provided at the connection between the first housing 1 and the second housing 2. The sealing groove 24 includes a first annular groove 241 and a second annular groove 242. The first annular groove 241 is arranged around the main oil passage 36, and the second annular groove 242 is arranged around the opening of the second housing 2 facing the first housing 1. The sealing element 4 is arranged in the first annular groove 241 and the second annular groove 242.

[0054] In this optional embodiment, the sealing groove 24 can be provided only on the mating surface of the first housing 1, or only on the mating surface of the second housing 2, or on both the mating surfaces of the first housing 1 and the second housing 2. Furthermore, the sealing groove 24 and the oil groove 23 can be provided on the same housing, or they can be provided on different housings, for example... Figure 5 and Figure 8 The example given is that the sealing groove 24 and the oil groove 23 are provided only on the mating surface of the second housing 2. The sealing groove 24 includes a first annular groove 241 and a second annular groove 242. The first annular groove 241 is arranged around the oil groove 23 that constitutes the main oil passage 36, and the shape of the first annular groove 241 is adapted to the shape of the oil groove 23. The second annular groove 242 is arranged around the opening of the end of the second housing 2 facing the first housing 1. The first annular groove 241 and the second annular groove 242 can be arranged alternately or partially overlapped. When the first annular groove 241 and the second annular groove 242 are arranged alternately, it is equivalent to setting a sealing element 4 in each of the first annular groove 241 and the second annular groove 242 for sealing. When the first annular groove 241 and the second annular groove 242 are partially overlapped, the sealing element 4 installed in the sealing groove 24 is an integral structure. In this way, the seal 4 located in the first annular groove 241 can seal the main oil passage 36, and the seal 4 located in the second annular groove 242 can seal the internal space of the first housing 1 and the second housing 2.

[0055] Furthermore, combined Figure 8 As shown, the first annular groove 241 and the second annular groove 242 partially overlap. Specifically, the seal 4 is an integral structure comprising a first sealing part 41 and a second sealing part 42. The first sealing part 41 is disposed within the first annular groove 241, and the second sealing part 42 is disposed within the second annular groove 242. The first sealing part 41 and the second sealing part 42 share the same overlapping position in the first annular groove 241 and the second annular groove 242. This facilitates the integral structure of the seal 4 installed in the first annular groove 241 and the second annular groove 242, reducing the number of parts and lowering material management costs. Furthermore, it reduces the consumable materials for the seal 4, thus lowering production costs.

[0056] An electric drive system according to an embodiment of the present invention includes the housing assembly as described above.

[0057] The electric drive system in this embodiment also includes a reducer installed in the first housing 1, a motor installed in the second housing 2, an oil pump, an oil cooler 500, and an oil filter installed outside the housing assembly. The oil pump draws lubricating oil located at the bottom of the housing assembly into the oil pump through the oil filter and then delivers it to the oil cooler 500 for cooling. The cooled lubricating oil flows out of the oil cooler 500 and into the first oil passage 31, and then into the main oil passage 36. At the main oil passage 36, the oil is split. Part of the oil flows through the second oil passage 32 to the reduction gear 600 to cool and lubricate the reduction gear 600. Part of the oil flows through the third oil passage 33 to the inside of the rotor shaft 700 and flows through the radial hole on the rotor shaft 700 to the motor bearing to cool and lubricate the motor bearing. Another part of the oil flows through the fourth oil passage 34 to the stator winding 800 of the motor to cool and lubricate the motor stator.

[0058] Furthermore, the beneficial effects of the electric drive system in this embodiment are the same as those of the housing assembly described above, and will not be repeated here.

[0059] A vehicle according to an embodiment of the present invention includes the electric drive system described above.

[0060] The beneficial effects of the vehicle in this embodiment are the same as those of the electric drive system described above, and will not be repeated here.

[0061] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A housing assembly, characterized in that, The device includes a detachably connected first housing (1) and a second housing (2). The internal spaces of the first housing (1) and the second housing (2) are used to install a reducer and a motor, respectively. The first housing (1) has a first oil passage (31) for communicating with the oil outlet of the oil cooler (500) and a second oil passage (32) for extending to the reduction gear (600). The second housing (2) has a third oil passage (33) for extending to the interior of the rotor shaft (700) and a fourth oil passage (34) for extending to the stator winding (800). The first housing (1) and the... The connection of the second housing (2) is provided with a main oil passage (36), and the first oil passage (31), the second oil passage (32), the third oil passage (33) and the fourth oil passage (34) are respectively connected to the main oil passage (36). The lubricating oil flowing out from the oil cooler (500) flows into the main oil passage (36) through the first oil passage (31), and then flows through the second oil passage (32), the third oil passage (33) and the fourth oil passage (34) to the reduction gear (600), the interior of the rotor shaft (700) and the stator winding (800).

2. The housing assembly according to claim 1, characterized in that, An oil groove (23) is provided on the end face of the first housing (1) facing the second housing (2) and / or on the end face of the second housing (2) facing the first housing (1). The oil groove (23) is arranged along the circumference of the second housing (2) and constitutes the main oil passage (36).

3. The housing assembly according to claim 2, characterized in that, The first oil passage (31) and the third oil passage (33) are respectively connected to one end of the oil tank (23) along the circumference of the second housing (2), and / or the fourth oil passage (34) is located at the top of the second housing (2) and is connected to the other end of the oil tank (23) along the circumference of the second housing (2).

4. The housing assembly according to claim 1, characterized in that, The internal space of the first housing (1) is also used to install the differential. The first housing (1) is also provided with a fifth oil passage (35). The fifth oil passage (35) is connected to the first oil passage (31) and is used to extend to the differential gear. The lubricating oil flowing out from the oil cooler (500) flows into the first oil passage (31) and is divided into two paths. One path flows through the fifth oil passage (35) to the differential gear, and the other path flows into the main oil passage (36).

5. The housing assembly according to claim 1, characterized in that, The first housing (1) includes a first housing body (11) and an intermediate housing part (12). The first housing body (11) is detachably connected to the side of the intermediate housing part (12) away from the second housing (2). The first oil passage (31) includes a first oil passage (311) provided on the first housing body (11) and a second oil passage (312) provided on the intermediate housing part (12). The first oil passage (311), the second oil passage (312) and the main oil passage (36) are connected in sequence, and the first oil passage (311) is used to connect with the oil outlet of the oil cooler (500).

6. The housing assembly according to claim 1, characterized in that, The second housing (2) includes a second housing body (21) and an end cap (22). The end cap (22) is detachably connected to the side of the second housing body (21) away from the second housing (2). The third oil passage (33) includes a third oil channel (331) and a fourth oil channel (332) that are interconnected. The third oil channel (331) is disposed on the outer peripheral wall of the second housing body (21) and is connected to the main oil passage (36). The fourth oil channel (332) is disposed on the end cap (22) and is used to extend from one end of the rotor shaft (700) to the internal space of the rotor shaft (700).

7. The housing assembly according to claim 1, characterized in that, It also includes a seal (4), which seals the connection between the first housing (1) and the second housing (2).

8. The housing assembly according to claim 7, characterized in that, A sealing groove (24) is provided at the connection between the first housing (1) and the second housing (2). The sealing groove (24) includes a first annular groove (241) and a second annular groove (242). The first annular groove (241) is arranged around the main oil passage (36), and the second annular groove (242) is arranged around the opening of the second housing (2) facing the first housing (1). The sealing element (4) is arranged in the first annular groove (241) and the second annular groove (242).

9. An electric drive system, characterized in that, Includes the housing assembly as described in any one of claims 1-8.

10. A vehicle, characterized in that, Including the electric drive system as described in claim 9.

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