Drive axle assembly and vehicle

Abstract

The application discloses a drive axle assembly and a vehicle, and relates to the field of vehicles.The drive axle assembly comprises a shell, a motor and a speed reducer, the shell is internally provided with a first mounting cavity and a second mounting cavity, the motor is mounted in the first mounting cavity, the motor comprises a stator assembly and a rotor assembly, the motor is provided with a first lubricating oil channel for lubricating the stator assembly and / or the rotor assembly, the speed reducer is mounted in the second mounting cavity, the speed reducer comprises an input shaft, the input shaft is connected with the rotor assembly, the speed reducer is provided with a second lubricating oil channel, and the second lubricating oil channel is communicated with the first lubricating oil channel.Thus, the common shell design of the motor and the speed reducer can be realized, the volume and weight of the drive axle assembly are reduced, the first lubricating oil channel and the second lubricating oil channel are communicated, so that the motor and the speed reducer can share a lubricating system, no additional sealing is needed between the motor and the speed reducer, the cost of the drive axle assembly is reduced, and the practicability of the drive axle assembly is improved.

Description

Technical Field

[0001] This invention relates to the field of vehicles, and more particularly to a drive axle assembly and a vehicle. Background Technology

[0002] In related technologies, vehicles have a drive motor and a reducer. The drive motor and reducer are connected by splines and fasteners. However, the lubrication and cooling of the drive motor and reducer are independent, which is costly. Moreover, the oils used in the motor and reducer are different and incompatible. The dynamic sealing requirements for the drive motor and reducer are high. If not handled properly, oil leakage will occur, affecting the overall reliability. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a drive axle assembly that enables a shared housing design for the motor and reducer, and allows the motor and reducer to share a lubrication system, which helps to reduce costs.

[0004] According to an embodiment of the present invention, a drive axle assembly includes: a housing having a first mounting cavity and a second mounting cavity therein; a motor mounted in the first mounting cavity, the motor including a stator assembly and a rotor assembly, the motor having a first lubricating oil passage for lubricating the stator assembly and / or the rotor assembly; and a reducer mounted in the second mounting cavity, the reducer including an input shaft connected to the rotor assembly, the reducer having a second lubricating oil passage communicating with the first lubricating oil passage.

[0005] According to the embodiments of the present invention, the drive axle assembly can achieve a common housing design for the motor and reducer by mounting the motor and reducer together in the housing, which helps to reduce the size and weight of the drive axle assembly. Furthermore, by connecting the first lubrication oil passage and the second lubrication oil passage, the motor and reducer can share the lubrication system, eliminating the need for additional sealing between the motor and reducer, thus reducing the cost of the drive axle assembly and improving its practicality.

[0006] According to some embodiments of the present invention, in the drive axle assembly, the first lubricating oil passage includes a stator oil passage for lubricating the stator assembly and a rotor oil passage for lubricating the rotor assembly, and the second lubricating oil passage includes a first axial flow passage disposed on the input shaft, the first axial flow passage communicating with the rotor oil passage.

[0007] According to some embodiments of the present invention, the drive axle assembly includes a stator core and a stator winding, the stator core defining a stator oil passage between the stator core and the housing, the stator oil passage having a first outlet disposed toward the stator winding for guiding oil in the stator oil passage to the stator winding.

[0008] According to some embodiments of the present invention, the drive axle assembly further includes a first seal, the stator assembly having an opening at the end of the stator oil passage, the first seal being connected to the housing and the stator core respectively to seal the opening of the stator oil passage, and a first outlet being disposed on the first seal.

[0009] According to some embodiments of the present invention, in a drive axle assembly, the stator core is formed as part of the housing.

[0010] According to some embodiments of the drive axle assembly of the present invention, the first lubricating oil passage further includes a plurality of first oil inlet channels, the plurality of first oil inlet channels being connected to the stator oil passage.

[0011] According to some embodiments of the drive axle assembly of the present invention, at least one of the first oil inlet passages is provided with a first flow valve for regulating the flow rate.

[0012] According to some embodiments of the present invention, in a drive axle assembly, a portion of the first oil inlet passage is provided with the first flow valve.

[0013] According to some embodiments of the present invention, the drive axle assembly has an oil inlet and a connecting oil passage. The oil inlet is connected to the first oil inlet channel and the oil inlet is connected to the second lubricating oil passage through the connecting oil passage.

[0014] According to some embodiments of the present invention, in the drive axle assembly, the inlet end of the first axial flow channel is provided with a second flow valve for adjusting the flow rate.

[0015] According to some embodiments of the present invention, the drive axle assembly includes a rotor assembly, an input shaft is sleeved on the outside of the rotor shaft and fixedly connected to the rotor shaft, and a first oil guide pipe is provided inside the input shaft, the first oil guide pipe forming a first axial flow channel.

[0016] According to some embodiments of the drive axle assembly of the present invention, the input shaft is provided with an oil reservoir for guiding oil to the connection between the input shaft and the rotor shaft.

[0017] According to some embodiments of the present invention, in the drive axle assembly, the outer peripheral wall of the first oil guide pipe is fitted with a second seal, the second seal and the first oil guide pipe define the oil storage cavity, and the side wall of the first oil guide pipe is provided with a first oil supply hole communicating with the oil storage cavity.

[0018] According to some embodiments of the drive axle assembly of the present invention, the second seal is supported on the inner wall of the input shaft.

[0019] According to some embodiments of the present invention, the drive axle assembly further includes a drive shaft and an output shaft, the drive shaft powerly connecting the input shaft and the output shaft, and the second lubricating oil passage includes a second axial flow passage disposed within the drive shaft.

[0020] According to some embodiments of the present invention, in the drive axle assembly, the end of the second axial flow channel is connected to a liquid outlet, which is used to deliver oil into the second mounting cavity.

[0021] According to some embodiments of the present invention, in the drive axle assembly, the sidewall of the drive shaft is formed with an oil distribution port, which communicates with the second shaft flow channel.

[0022] According to some embodiments of the present invention, the drive axle assembly is provided with a second oil guide pipe inside the drive shaft, a second axial flow channel is formed inside the second oil guide pipe, and a second oil supply hole is provided on the side wall of the second oil guide pipe, the second oil supply hole being connected to the oil distribution port.

[0023] According to some embodiments of the present invention, in the drive axle assembly, an oil guide is sleeved on the outside of the second oil guide pipe, the oil guide forming a guide oil passage, the guide oil passage connecting the second oil supply hole and the oil distribution port.

[0024] According to some embodiments of the present invention, in a drive axle assembly, the drive shaft is connected to a first drive gear, the output shaft is connected to a second drive gear, and the first drive gear and the second drive gear are in a driving engagement; wherein, at least one side of the first drive gear is provided with an oil baffle, and / or at least one side of the second drive gear is provided with an oil baffle.

[0025] According to some embodiments of the present invention, the drive axle assembly further includes: an axle housing having a receiving opening, the axle housing being limited to the housing to form a defined receiving space at the receiving opening, the output shaft being located within the receiving space and being drively connected to the axle housing, and a third seal being provided between the axle housing and the housing, the third seal being disposed around the receiving opening.

[0026] According to some embodiments of the present invention, in the drive axle assembly, the bottom of the first mounting cavity is provided with an oil return port, which communicates with the second mounting cavity.

[0027] According to some embodiments of the present invention, the drive axle assembly has multiple oil return ports, which are respectively located at both ends of the rotor assembly along its length.

[0028] According to some embodiments of the present invention, the drive axle assembly further includes: an oil return pump and an oil cooler, wherein the oil return pump is used to draw oil from the second mounting cavity into the oil cooler, and the oil cooler is used to cool the oil.

[0029] According to some embodiments of the present invention, the drive axle assembly further includes: a detection element disposed at the inlet end of the oil cooler, the detection element including at least one of a temperature sensor and a pressure sensor.

[0030] According to some embodiments of the present invention, the drive axle assembly includes a first housing and a second housing, the first housing defining a first mounting cavity, and the first housing cooperating with the second housing to define the second mounting cavity.

[0031] The present invention also proposes a vehicle.

[0032] A vehicle according to an embodiment of the present invention includes: a drive axle assembly according to any of the above embodiments.

[0033] The vehicle and the drive axle assembly have the same advantages over the prior art, which will not be repeated here.

[0034] 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

[0035] 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:

[0036] Figure 1 This is a schematic diagram of a drive axle assembly according to an embodiment of the present invention;

[0037] Figure 2 This is a cross-sectional view of the drive axle assembly according to an embodiment of the present invention;

[0038] Figure 3 This is a flow path diagram of the drive axle assembly according to an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the installation of the rotor shaft and the input shaft according to an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of a speed reducer according to an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of a drive shaft according to an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of the installation of the second oil guide pipe according to an embodiment of the present invention;

[0043] Figure 8 This is a schematic diagram of the installation of the bridge housing and the housing according to an embodiment of the present invention;

[0044] Figure 9 This is a schematic diagram of the oil return port according to an embodiment of the present invention;

[0045] Figure 10 This is an exploded view of the casing according to an embodiment of the present invention.

[0046] Figure label:

[0047] Drive axle assembly 100;

[0048] Housing 1; First housing 11; Second housing 12; First mounting cavity 13; Second mounting cavity 14; Oil return port 15; Oil supply channel 16;

[0049] Motor 2; Stator assembly 21; Stator core 211; Stator winding 212; First seal 213;

[0050] Rotor assembly 22; Rotor shaft 221; Rotor core 222;

[0051] First lubricating oil passage 23; stator oil passage 231; rotor oil passage 232; first oil inlet passage 233;

[0052] Reducer 3; Input shaft 31; Drive shaft 32; Oil distributor 321; First drive gear 322; Output shaft 33; Second drive gear 331; Second lubricating oil passage 34; First axial flow passage 341; Second axial flow passage 342;

[0053] First oil guide pipe 35; second oil guide pipe 36; second seal 37; oil storage chamber 371; liquid outlet 38; oil drainage component 39;

[0054] Bridge housing 4; receiving port 41; oil baffle 5; first flow valve 61; second flow valve 62;

[0055] Oil return pump 71; oil cooler 72; detection element 8; temperature sensor 81; pressure sensor 82;

[0056] First filter element 91; second filter element 92; flow valve 93. Detailed Implementation

[0057] 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.

[0058] 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.

[0059] 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 the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0060] Hereinafter, with reference to the accompanying drawings, a drive axle assembly 100 according to an embodiment of the present invention will be described.

[0061] like Figures 1-10 As shown, the drive axle assembly 100 according to an embodiment of the present invention includes: a housing 1, a motor 2, and a reducer 3. The housing 1 is provided with a first mounting cavity 13 and a second mounting cavity 14. The motor 2 is mounted in the first mounting cavity 13. The motor 2 includes a stator assembly 21 and a rotor assembly 22. The motor 2 has a first lubricating oil passage 23 for lubricating the stator assembly 21 and / or the rotor assembly 22. The reducer 3 is mounted in the second mounting cavity 14. The reducer 3 includes an input shaft 31, which is connected to the rotor assembly 22. The reducer 3 has a second lubricating oil passage 34, which communicates with the first lubricating oil passage 23.

[0062] First, such as Figures 1-2As shown, the drive axle assembly 100 includes a housing 1, a motor 2, and a reducer 3. The housing 1 has a first mounting cavity 13 and a second mounting cavity 14, in which the motor 2 can be mounted. The motor 2 includes a stator assembly 21 and a rotor assembly 22. The stator assembly 21 is sleeved on the outside of the rotor assembly 22, and the stator assembly 21 and the rotor assembly 22 are coupled together so that the stator assembly 21 can drive the rotor assembly 22 to rotate around its own axis. The motor 2 also has a first lubricating oil passage 23 for lubricating the stator assembly 21 and / or the rotor assembly 22.

[0063] For example, the first lubricating oil passage 23 can be provided for lubricating the stator assembly 21; or, the first lubricating oil passage 23 can be provided for lubricating the rotor assembly 22; or, the first lubricating oil passage 23 can be provided to lubricate both the stator assembly 21 and the rotor assembly 22 at the same time. The present invention does not limit this.

[0064] Simultaneously, the input shaft 31 can be connected to the rotor assembly 22, which drives the input shaft 31 to rotate synchronously, allowing the reducer 3 to output power outward. The reducer 3 has a second lubrication passage 34 for lubricating the reducer 3. The second lubrication passage 34 is connected to the first lubrication passage 23, allowing oil to flow between them, thus simultaneously lubricating both the reducer 3 and the motor 2. It should be noted that the type of oil selected should consider both the lubrication requirements of the reducer 3 and the motor 2.

[0065] The above configuration allows for a shared housing design for the motor 2 and the reducer 3, reducing overlapping surfaces and the number of required fasteners. This facilitates dimensional accuracy control, improves assembly precision, and reduces the size and weight of the drive axle assembly 100. Furthermore, the motor 2 and reducer 3 can share a lubrication system, eliminating the risk of oil cross-contamination. No additional seals are required between the motor 2 and reducer 3, further reducing the cost of the drive axle assembly 100.

[0066] According to the embodiments of the present invention, the drive axle assembly 100 can achieve a common housing design for the motor 2 and the reducer 3 by mounting the motor 2 and the reducer 3 together in the housing 1, which helps to reduce the volume and weight of the drive axle assembly 100. Furthermore, by connecting the first lubrication oil passage 23 and the second lubrication oil passage 34, the motor 2 and the reducer 3 can share the lubrication system, and no additional seal is required between the motor 2 and the reducer 3, which helps to reduce the cost of the drive axle assembly 100 and improves the practicality of the drive axle assembly 100.

[0067] In some embodiments of the present invention, the first lubricating oil passage 23 includes a stator oil passage 231 for lubricating the stator assembly 21 and a rotor oil passage 232 for lubricating the rotor assembly 22, and the second lubricating oil passage 34 includes a first axial flow passage 341 disposed on the input shaft 31, the first axial flow passage 341 being connected to the rotor oil passage 232.

[0068] For example, refer to Figure 2 As shown, the first lubricating oil passage 23 includes a stator oil passage 231 and a rotor oil passage 232. The stator oil passage 231 is located on the stator assembly 21 and is used to lubricate the stator assembly 21. The rotor oil passage 232 is located on the rotor assembly 22 and is used to lubricate the rotor assembly 22. The second lubricating oil passage 34 includes a first axial flow passage 341. The first axial flow passage 341 is located on the input shaft 31 and is connected to the rotor oil passage 232.

[0069] During the specific operation, the oil flowing into the drive axle assembly 100 can be divided into multiple parts. One part of the oil can flow into the stator oil passage 231 to lubricate the stator assembly 21; another part of the oil can flow into the first shaft flow passage 341 to cool the input shaft 31 from the inside; and then the oil can flow into the rotor oil passage 232 to lubricate and cool the rotor assembly 22.

[0070] The above configuration allows for full utilization of space, reduces the size of housing 1, simplifies the flow path, lowers the structural complexity of drive axle assembly 100, and improves the practicality of drive axle assembly 100.

[0071] In some embodiments of the present invention, the stator assembly 21 includes a stator core 211 and a stator winding 212. A stator oil passage 231 is defined between the stator core 211 and the housing 1. The stator oil passage 231 has a first outlet, which is disposed toward the stator winding 212 to guide oil in the stator oil passage 231 to the stator winding 212.

[0072] For example, refer to Figure 2As shown, the stator assembly 21 includes a stator core 211 and a stator winding 212. The stator core 211 is cylindrical, and the stator winding 212 is located on the inner circumferential wall of the stator core 211. The rotor assembly 22 is located inside the stator winding 212 and coupled to it. A stator oil passage 231 is defined between the outer circumferential wall of the stator core 211 and the inner wall of the housing 1. The stator oil passage 231 has a first outlet facing the stator winding 212. This first outlet guides the oil in the stator oil passage 231 to the stator winding 212, allowing the oil to contact the stator winding 212 for cooling. This provides efficient cooling of the stator winding 212, reducing its operating temperature and improving the operational stability of the motor 2.

[0073] In some embodiments of the present invention, such as Figure 2 As shown, the stator assembly 21 also includes a first seal 213. The stator oil passage 231 has an open end. The first seal 213 is annular in structure. The first seal 213 is located on the side of the housing 1 facing the stator winding 212 and at the end of the stator core 211. The first seal 213 is connected to the housing 1 and the stator core 211 respectively. The first seal 213 is used to seal the open end of the stator oil passage 231. The first outlet is located on the first seal 213.

[0074] With the above settings, the first seal 213 can separate the stator oil passage 231 and the stator winding 212, which can better define the stator oil passage 231, avoid uneven heat dissipation caused by disordered oil flow, reduce the molding difficulty of the stator oil passage 231, and improve the practicality of the drive axle assembly 100.

[0075] In some embodiments of the present invention, the first sealing member 213 includes a main body and a sealing part. The main body may be made of a rigid material such as hard plastic and has a first outlet. The sealing part is located on the side of the main body facing the stator core 211 and may be made of an elastic material such as rubber. The sealing part is used to support the stator core 211 to achieve a sealing fit between the stator core 211 and the main body. This improves the sealing effect of the first sealing member 213.

[0076] In some embodiments of the present invention, multiple first flow outlets can be provided, and the multiple first flow outlets are spaced apart along the circumference of the stator core 211. This allows the oil to more comprehensively cover the stator winding 212, improving the temperature uniformity of the stator winding 212 and enhancing the operational stability of the motor 2.

[0077] In some embodiments of the present invention, such as Figure 2 and Figure 3As shown, the first lubricating oil passage 23 also includes multiple first oil inlet channels 233, which are arranged at intervals and are connected to the stator oil passage 231. This reduces the probability of blockage in the first oil inlet channels 233, improves oil supply stability, and helps improve the operational stability of the motor 2.

[0078] In some embodiments of the present invention, such as Figure 3 As shown, at least one first oil inlet channel 233 is equipped with a first flow valve 61, which is used to adjust the oil flow rate in the corresponding first oil inlet channel 233. This allows for dynamic adjustment of the total oil quantity in the stator oil passage 231, achieving real-time optimal oil quantity distribution and improving the overall performance of the drive axle assembly 100.

[0079] In some embodiments of the present invention, such as Figure 3 As shown, a first flow valve 61 can be provided in a portion of the first oil inlet channel 233. Exemplarily, three first oil inlet channels 233 can be provided, arranged circumferentially around the stator core 211, with two of the first oil inlet channels 233 equipped with the first flow valve 61. Of course, a first flow valve 61 can also be provided in each of the first oil inlet channels 233; this invention does not limit this. Therefore, the total oil volume in the stator oil passage 231 can be adjusted more flexibly, which is beneficial for meeting different operating conditions.

[0080] In some embodiments of the present invention, such as Figure 2 As shown, the housing 1 is provided with an oil supply channel 16, which connects the first oil inlet channel 233 with the stator oil passage 231, allowing the oil in the first oil inlet channel 233 to flow through the oil supply channel 16 and into the stator oil passage 231. The oil supply channel 16 can also connect with the first mounting cavity 13. The oil supply channel 16 is used to supply oil to the bearing located at the end of the rotor assembly 22 to lubricate the bearing. This improves the operational stability of the motor 2.

[0081] In some embodiments of the present invention, an oil inlet and a connecting oil passage may be provided in the housing 1. The oil inlet is connected to the first oil inlet channel 233, and the oil inlet can be connected to the second lubricating oil passage 34 through the connecting oil passage. This allows the flow paths within the drive axle assembly 100 to share the same oil inlet, which helps to reduce the assembly difficulty of the drive axle assembly 100.

[0082] In some embodiments of the present invention, such as Figure 3As shown, a second flow valve 62 can be provided at the inlet end of the first axial flow channel 341. The second flow valve 62 is used to regulate the oil flow rate in the first axial flow channel 341. Thus, the oil quantity in the rotor oil passage 232 can be dynamically adjusted, realizing the real-time optimal distribution of oil quantity and improving the overall performance of the drive axle assembly 100.

[0083] In some embodiments of the present invention, such as Figure 4 As shown, the rotor assembly 22 includes a rotor shaft 221, an input shaft 31 sleeved on the outside of the rotor shaft 221 and fixedly connected to the rotor shaft 221, a rotor oil passage 232 is provided inside the rotor shaft 221, a first oil guide pipe 35 is provided inside the input shaft 31, the first oil guide pipe 35 is inserted into the inside of the rotor shaft 221, the first oil guide pipe 35 forms a first axial flow channel 341, and the first axial flow channel 341 communicates with the rotor oil passage 232.

[0084] With the above settings, the inner diameter of the input shaft 31 is not limited by the size of the first shaft flow channel 341, which is conducive to the lightweight design of the input shaft 31 and can maximize the utilization of oil, thus improving the practicality of the drive axle assembly 100.

[0085] In some embodiments of the present invention, such as Figure 4 As shown, the rotor assembly 22 also includes a rotor core 222, which (including permanent magnets) is sleeved on the outside of the rotor shaft 221 and used for coupling with the stator winding 212. The rotor shaft 221 has a second outlet, which is connected to the rotor oil passage 232. When the rotor shaft 221 rotates around its own axial direction, the oil in the rotor oil passage 232 can flow through the second outlet to the rotor core 222 and the stator winding 212, and is used to cool the rotor core 222 and the stator winding 212. This reduces the operating temperature of the motor 2 and improves the operational stability of the motor 2.

[0086] In some embodiments of the present invention, an internal spline may be provided on the inner peripheral wall of the input shaft 31, and an external spline may be provided on the outer peripheral wall of the rotor shaft 221. The internal spline can mate with the external spline to achieve a keyed connection between the input shaft 31 and the rotor shaft 221. This reduces the assembly difficulty of the input shaft 31 and the rotor shaft 221.

[0087] In some embodiments of the present invention, such as Figure 4As shown, the input shaft 31 has an internal oil reservoir 371, which can communicate with the first shaft flow channel 341 (or other flow path or space containing oil). The oil reservoir 371 is used to guide oil to the connection between the input shaft 31 and the rotor shaft 221, so that the oil can lubricate the connection between the input shaft 31 and the rotor shaft 221. This prevents rusting at the connection between the input shaft 31 and the rotor shaft 221, thus improving the reliability of the drive axle assembly 100.

[0088] Of course, an oil reservoir 371 can also be provided at the end of the input shaft 31 away from the rotor shaft 221 so that the oil reservoir 371 can be used to lubricate the bearing at the end of the rotor shaft 221. This will not be elaborated further here.

[0089] In some embodiments of the present invention, such as Figure 4 As shown, a second sealing element 37 can be sleeved on the outer peripheral wall of the first oil guide tube 35. An oil storage cavity 371 is defined between the second sealing element 37 and the first oil guide tube 35. A first oil supply hole is provided on the side wall of the first oil guide tube 35. The first oil supply hole communicates with the oil storage cavity 371 so that the oil in the first oil guide tube 35 can flow into the oil storage cavity 371 through the first oil supply hole.

[0090] The above settings simplify the structure, enable stable oil supply at the connection between the input shaft 31 and the rotor shaft 221, prevent oil backflow and waste, and improve the reliability of the drive axle assembly 100.

[0091] In some embodiments of the present invention, such as Figure 4 As shown, a second seal 37 can be provided and supported on the inner wall of the input shaft 31. It should be noted that the material of the second seal 37 can be elastic materials such as silicone rubber or fluororubber. This improves the sealing performance of the oil reservoir 371, reducing the probability of leakage.

[0092] In some embodiments of the present invention, such as Figures 5-7 As shown, the reducer 3 also includes a drive shaft 32 and an output shaft 33. The drive shaft 32 connects the input shaft 31 and the output shaft 33 so that the rotor assembly 22 can drive the output shaft 33 to rotate through the input shaft 31 and the drive shaft 32 to output power outward. The second lubrication passage 34 includes a second axial flow passage 342, which is located inside the drive shaft 32 and is used to lubricate the drive shaft 32.

[0093] The above configuration makes full use of the space inside the drive shaft 32, reduces the oil passage inside the housing 1, simplifies the structure of the drive axle assembly 100, and improves the practicality of the drive axle assembly 100.

[0094] In some embodiments of the present invention, such as Figure 7 As shown, the end of the second axial flow channel 342 is connected to a liquid outlet 38, which can be configured as a nozzle. The liquid outlet 38 is used to deliver oil into the second mounting cavity 14. As a result, the various components of the reducer 3 (such as gears, bearings, etc.) can be fully lubricated, which helps to improve the operating stability of the reducer 3 and improves the reliability of the drive axle assembly 100.

[0095] In some embodiments of the present invention, such as Figure 7 As shown, the side wall of the drive shaft 32 can be provided with an oil distribution port 321, which communicates with the second axial flow channel 342. When the drive shaft 32 rotates, it can throw the oil in the second axial flow channel 342 outward from the oil distribution port 321 to lubricate the components in the second mounting cavity 14. This accelerates the oil circulation efficiency and allows for a wider oil coverage area, improving the lubrication effect of the oil on the reducer 3.

[0096] In some embodiments of the present invention, such as Figure 7 As shown, a second oil guide pipe 36 is provided inside the drive shaft 32. A second axial flow channel 342 is formed inside the second oil guide pipe 36, and a second oil supply hole is provided on the side wall of the second oil guide pipe 36. The second oil supply hole is connected to the oil distribution port 321. When the drive shaft 32 rotates, the oil in the second axial flow channel 342 can flow out from the second oil supply hole and flow into the second mounting cavity 14 through the oil distribution port 321 to lubricate the components in the second mounting cavity 14.

[0097] With the above settings, the inner diameter of the drive shaft 32 is not limited by the size of the second axial flow channel 342, which is conducive to the lightweight design of the drive shaft 32 and can maximize the utilization of oil, thus improving the practicality of the drive axle assembly 100.

[0098] Of course, such as Figure 6 As shown, the second axial flow channel 342 can also be directly defined inside the drive shaft 32. This simplifies the structure and reduces the machining difficulty of the drive shaft 32.

[0099] In some embodiments of the present invention, such as Figures 6-7 As shown, there are multiple drive shafts 32. The second axial flow channels 342 of multiple drive shafts 32 can be defined by the second oil guide pipe 36; alternatively, the second axial flow channels 342 of multiple drive shafts 32 can be directly defined by the inner wall of the drive shaft 32; or, a portion of the second axial flow channels 342 of the drive shafts 32 can be defined by the second oil guide pipe 36, while another portion of the second axial flow channels 342 of the drive shafts 32 can be directly defined by the inner wall of the drive shaft 32. This invention does not impose any limitations on these options. Therefore, it is advantageous to meet different design requirements.

[0100] In some embodiments of the present invention, such as Figure 7 As shown, an oil guiding component 39 can be sleeved on the outside of the second oil guide pipe 36. The oil guiding component 39 forms a guiding oil passage, which is used to connect the second oil supply hole and the oil distribution port 321. It should be noted that the material of the oil guiding component 39 can be any of the following materials: plastic, rubber, etc.

[0101] The above settings can improve the flow stability of the oil, so that the oil outlet 321 can continuously and stably supply oil into the second mounting cavity 14, and can define an oil-free space between the oil guide 39 and the inner wall of the drive shaft 32, which can prevent a large amount of oil from accumulating in the drive shaft 32 and improve the operating stability of the drive shaft 32.

[0102] Of course, the present invention is not limited to this; the second oil guide pipe 36 and the oil guiding component 39 can also be integrally formed. This reduces the number of installation steps and lowers the installation difficulty.

[0103] In some embodiments of the present invention, such as Figure 5 As shown, the drive shaft 32 is connected to a first drive gear 322, and the output shaft 33 is connected to a second drive gear 331. The first drive gear 322 and the second drive gear 331 are in a driving engagement. An oil baffle 5 may be provided on at least one side of the first drive gear 322; and / or, an oil baffle 5 may be provided on at least one side of the second drive gear 331.

[0104] Specifically, an oil baffle 5 can be provided on one side of the first transmission gear 322. The oil baffle 5 and the side wall of the second mounting cavity 14 enclose the oil to restrict the flow of oil. When the first transmission gear 322 is running, the first transmission gear 322 will not be soaked in too much oil, reducing the oil churning loss of the transmission shaft 32. At the same time, oil baffles 5 can be provided on opposite sides of the second transmission gear 331. The two oil baffles 5 enclose the oil to restrict the flow of oil. When the second transmission gear 331 is running, the second transmission gear 331 will not be soaked in too much oil, reducing the oil churning loss of the output shaft 33.

[0105] It should be noted that encirclement does not mean complete enclosure. An oil outlet needs to be reserved to ensure that the oil can circulate to the first transmission gear 322 and the second transmission gear 331. When there are multiple transmission shafts 32, the transmission shaft 32 with a higher position does not need to be equipped with an oil baffle 5.

[0106] Understandably, by setting the oil baffle 5, the flow path of the oil can be restricted, which not only ensures that the gears are not immersed in the oil too much, reducing oil churning losses and improving transmission efficiency, but also meets the lubrication and heat dissipation requirements, thus improving the design rationality of the drive axle assembly 100.

[0107] In some embodiments of the present invention, such as Figure 8 As shown, the drive axle assembly 100 of this embodiment further includes: an axle housing 4, with a receiving opening 41 formed in the middle of the axle housing 4. The axle housing 4 is in a limiting fit with the housing 1. A cover is provided on the side of the axle housing 4 away from the housing 1. The cover is connected to the axle housing 4 and is used to seal the receiving opening 41. The axle housing 4, the housing 1, and the cover can form a defined receiving space at the receiving opening 41. The output shaft 33 is located in the receiving space and is drively connected to the axle housing 4. The housing 1 is provided with an oil inlet, which communicates with the receiving space, allowing oil to flow from the oil inlet into the receiving space, so that the motor 2, the reducer 3, and the axle housing 4 can share a lubrication system. A third sealing element can be provided between the axle housing 4 and the housing 1. The third sealing element is annular in structure and surrounds the receiving opening 41 to seal the receiving space.

[0108] It should be noted that the third seal can be made of elastic materials such as fluororubber or silicone rubber, or it can be constructed as a steel sealant. Alternatively, the housing 1 and the bridge housing 4 can be directly sealed using sealant; this invention does not impose any limitations on this.

[0109] The above settings can effectively seal the gap between the axle housing 4 and the housing 1, prevent oil leakage, and improve the reliability of the drive axle assembly 100.

[0110] In some embodiments of the present invention, such as Figure 9 As shown, an oil return port 15 can be provided at the bottom of the first mounting cavity 13, and an oil collection area is formed at the bottom of the second mounting cavity 14. The oil return port 15 is connected to the second mounting cavity 14 and is used to guide the oil in the first mounting cavity 13 into the second mounting cavity 14 and store it in the oil collection area.

[0111] During operation, when the drive axle assembly 100 starts running, oil flows into the oil inlet. The oil flowing into the oil inlet is divided into two parts. One part of the oil flows directly into the stator oil passage 231 from one side of the housing 1. The oil in the stator oil passage 231 can flow to the stator winding 212 through the first outlet. The oil flows along the stator winding 212 to cool it. Then, the oil can drip onto the bottom of the first mounting cavity 13 and flow into the second mounting cavity 14 from the oil return port 15. The other part of the oil can flow to the other side of the housing 1 through the connecting oil passage. On one side, oil can flow into the first axial flow channel 341 and the second axial flow channel 342 respectively. The oil flowing into the first axial flow channel 341 can flow into the rotor oil passage 232. The oil in the rotor oil passage 232 can flow out from the second outlet to the first mounting cavity 13 and flow into the second mounting cavity 14 from the oil return port 15. The oil flowing into the second axial flow channel 342 can flow out to the second mounting cavity 14 through the liquid outlet 38 and the oil distribution port 321, and lubricate the components in the second mounting cavity 14. The oil flowing into the second mounting cavity 14 can be concentrated in the oil collection area.

[0112] The above settings enable centralized storage of oil, which facilitates subsequent operations and improves the design rationality of the drive axle assembly 100.

[0113] In some embodiments of the present invention, such as Figure 9 As shown, multiple oil return ports 15 can be provided, with each port 15 located at one end of the rotor assembly 22 along its length. This configuration allows the drive axle assembly 100 to return oil under different postures, avoiding problems such as poor oil return on one side, oil accumulation leading to efficiency loss, and uneven heat dissipation under vehicle tilting or other postures, thus improving the operational stability of the drive axle assembly 100.

[0114] In some embodiments of the present invention, the drive axle assembly 100 of the present invention further includes: an oil return pump 71 and an oil cooler 72, wherein the oil return pump 71 is used to draw oil from the second mounting cavity 14 into the oil cooler 72, and the oil cooler 72 is used to cool the oil.

[0115] For example, refer to Figure 3 As shown, the drive axle assembly 100 also includes a return oil pump 71 and an oil cooler 72. The inlet end of the return oil pump 71 is connected to the oil collection area of ​​the second mounting cavity 14, and the outlet end of the return oil pump 71 is connected to the oil cooler 72. The return oil pump 71 is used to draw oil from the second mounting cavity 14 into the oil cooler 72, which is used to cool the oil. The oil cooler 72 is connected to the oil inlet and can guide the cooled oil into the oil inlet. This allows the oil to be recycled within the drive axle assembly 100, improving the integration of the drive axle assembly 100.

[0116] In some embodiments of the present invention, such as Figure 3 As shown, the drive axle assembly 100 of this embodiment further includes a detection element 8, which is disposed at the inlet end of the oil cooler 72. The detection element 8 includes at least one of a temperature sensor 81 and a pressure sensor 82. Exemplarily, the detection element 8 can be configured as a temperature sensor 81; or, it can be configured as a pressure sensor 82; or, the detection element 8 can include both a temperature sensor 81 and a pressure sensor 82. This invention does not limit the scope of the invention.

[0117] Understandably, temperature sensor 81 can be used to detect the temperature of the oil, and the management system can control the speed of return pump 71 according to the oil temperature (i.e., the higher the oil temperature, the faster the speed of return pump 71); while pressure sensor 82 is used to detect the pressure of the oil. When the oil pressure is insufficient, oil can be added to the drive axle assembly 100 to ensure that the motor 2 and reducer 3 can be adequately cooled, thereby improving the reliability of drive axle assembly 100.

[0118] In some embodiments of the present invention, such as Figure 3 As shown, the drive axle assembly 100 of this embodiment further includes: a first filter element 91 and a second filter element 92. The first filter element 91 is located at the inlet end of the return oil pump 71 and is used to filter the oil flowing to the return oil pump 71 to prevent impurities from accumulating inside the return oil pump 71. The second filter element 92 is located at the inlet end of the oil cooler 72 and is used to perform secondary filtration on the oil flowing to the oil cooler 72 to prevent impurities from accumulating inside the oil cooler 72. This improves the service life of the drive axle assembly 100.

[0119] In some embodiments of the present invention, such as Figure 3 As shown, the drive axle assembly 100 of this embodiment of the invention also includes a flow valve 93. The flow valve 93 is connected between the outlet end and the inlet end of the return oil pump 71. When the pressure at the outlet end of the return oil pump 71 is too high, the flow valve 93 can open to directly guide the oil into the inlet. This avoids insufficient oil supply to the motor 2 and the reducer 3, improving the operational stability of the drive axle assembly 100.

[0120] In some embodiments of the present invention, such as Figure 10 As shown, housing 1 includes a first housing 11 and a second housing 12. The first housing 11 defines a first mounting cavity 13, and the first housing 11 and the second housing 12 cooperate to define a second mounting cavity 14. This reduces the molding difficulty of housing 1 and improves the practicality of the drive axle assembly 100.

[0121] The present invention also proposes a vehicle.

[0122] A vehicle according to an embodiment of the present invention includes: a drive axle assembly 100 according to any of the above embodiments.

[0123] According to the vehicle of the present invention, the drive axle assembly 100 is small in size, light in weight, and low in cost, which makes the vehicle easy to arrange and can reduce the overall weight and cost of the vehicle, thereby improving the vehicle's product competitiveness.

[0124] 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.

[0125] 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. A drive axle assembly, characterized in that, include: The housing (1) has a first mounting cavity (13) and a second mounting cavity (14) inside. The motor (2) is installed in the first mounting cavity (13), the motor (2) includes a stator assembly (21) and a rotor assembly (22), and the motor (2) has a first lubricating oil passage (23) for lubricating the stator assembly (21) and / or the rotor assembly (22). The reducer (3) is installed in the second mounting cavity (14). The reducer (3) includes an input shaft (31) connected to the rotor assembly (22). The reducer (3) has a second lubricating oil passage (34) connected to the first lubricating oil passage (23). The first lubricating oil passage (23) includes a stator oil passage (231) for lubricating the stator assembly (21) and a rotor oil passage (232) for lubricating the rotor assembly (22). The second lubricating oil passage (34) includes a first axial flow passage (341) disposed on the input shaft (31), and the first axial flow passage (341) is connected to the rotor oil passage (232). The reducer (3) also includes a drive shaft (32) and an output shaft (33). The drive shaft (32) connects the input shaft (31) and the output shaft (33) in a power manner. The second lubricating oil passage (34) includes a second axial flow passage (342) disposed in the drive shaft (32). Wherein, the end of the second axial flow channel (342) is connected to a liquid outlet (38), the liquid outlet (38) is used to deliver oil into the second mounting cavity (14); and / or, the side wall of the drive shaft (32) is formed with an oil distribution port (321), the oil distribution port (321) is connected to the second axial flow channel (342); The first lubricating oil passage (23) further includes a plurality of first oil inlet channels (233), which are connected to the stator oil passage (231); One part of the first oil inlet channel (233) is provided with a first flow valve (61) for adjusting the flow rate; The housing (1) is provided with an oil supply channel (16), which connects the first oil inlet channel (233) with the stator oil channel (231) and is also connected to the first mounting cavity (13). The inlet end of the first axial flow channel (341) is provided with a second flow valve (62) for adjusting the flow rate.

2. The drive axle assembly according to claim 1, characterized in that, The stator assembly (21) includes a stator core (211) and a stator winding (212), wherein the stator core (211) defines a stator oil passage (231) between itself and the housing (1), the stator oil passage (231) having a first outlet disposed toward the stator winding (212) for guiding oil in the stator oil passage (231) to the stator winding (212).

3. The drive axle assembly according to claim 2, characterized in that, The stator assembly (21) further includes a first seal (213), the end of the stator oil passage (231) is formed with an opening, the first seal (213) is connected to the housing (1) and the stator core (211) respectively to seal the opening of the stator oil passage (231), and the first outlet is provided at the first seal (213).

4. The drive axle assembly according to claim 1, characterized in that, The housing (1) is provided with an oil inlet and a connecting oil passage. The oil inlet is connected to the first oil inlet channel (233), and the oil inlet is connected to the second lubricating oil passage (34) through the connecting oil passage.

5. The drive axle assembly according to claim 1, characterized in that, The rotor assembly (22) includes a rotor shaft (221), and the input shaft (31) is sleeved on the outside of the rotor shaft (221) and fixedly connected to the rotor shaft (221). The input shaft (31) is provided with a first oil guide pipe (35), and the first oil guide pipe (35) forms a first axial flow channel (341).

6. The drive axle assembly according to claim 5, characterized in that, The input shaft (31) has an oil storage chamber (371) inside for guiding oil to the connection between the input shaft (31) and the rotor shaft (221).

7. The drive axle assembly according to claim 6, characterized in that, The outer peripheral wall of the first oil guide tube (35) is covered with a second sealing member (37), and the oil storage cavity (371) is defined between the second sealing member (37) and the first oil guide tube (35). The side wall of the first oil guide tube (35) is provided with a first oil supply hole that communicates with the oil storage cavity (371).

8. The drive axle assembly according to claim 7, characterized in that, The second seal (37) is supported on the inner wall of the input shaft (31).

9. The drive axle assembly according to claim 1, characterized in that, The drive shaft (32) is provided with a second oil guide pipe (36), and a second axial flow channel (342) is formed in the second oil guide pipe (36). The side wall of the second oil guide pipe (36) is provided with a second oil supply hole, which is connected to the oil distribution port (321).

10. The drive axle assembly according to claim 9, characterized in that, An oil guide (39) is sleeved on the outside of the second oil guide pipe (36). The oil guide (39) forms a guide oil passage, which connects the second oil supply hole with the oil distribution port (321).

11. The drive axle assembly according to claim 1, characterized in that, The drive shaft (32) is connected to a first drive gear (322), and the output shaft (33) is connected to a second drive gear (331). The first drive gear (322) and the second drive gear (331) are in a transmission engagement. Among them, at least one side of the first transmission gear (322) is provided with an oil baffle (5), and / or at least one side of the second transmission gear (331) is provided with an oil baffle (5).

12. The drive axle assembly according to claim 1, characterized in that, Also includes: A bridge housing (4) has a receiving opening (41). The bridge housing (4) and the housing (1) are matched to form a defined receiving space at the receiving opening (41). The output shaft (33) is located in the receiving space and is connected to the bridge housing (4) in a driving manner. A third sealing element is provided between the bridge housing (4) and the housing (1). The third sealing element is arranged around the receiving opening (41).

13. The drive axle assembly according to claim 1, characterized in that, The bottom of the first mounting cavity (13) is provided with an oil return port (15), which is connected to the second mounting cavity (14).

14. The drive axle assembly according to claim 13, characterized in that, There are multiple oil return ports (15), and the multiple oil return ports (15) are located at both ends of the rotor assembly (22) along the length direction.

15. The drive axle assembly according to claim 13, characterized in that, Also includes: The oil return pump (71) and the oil cooler (72) are used to draw oil from the second mounting cavity (14) into the oil cooler (72), which is used to cool the oil.

16. The drive axle assembly according to claim 15, characterized in that, Also includes: The detection element (8) is located at the inlet end of the oil cooler (72) and includes at least one of a temperature sensor (81) and a pressure sensor (82).

17. The drive axle assembly according to claim 1, characterized in that, The housing (1) includes a first housing (11) and a second housing (12), the first housing (11) defining the first mounting cavity (13), and the first housing (11) cooperating with the second housing (12) to define the second mounting cavity (14).

18. A vehicle, characterized in that, include: The drive axle assembly (100) according to any one of claims 1-17.

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