Drive axle assembly and vehicle

Abstract

The invention 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, and a first mounting cavity and a second mounting cavity are formed in the shell; the motor is installed in the first installation cavity, the motor comprises a stator assembly and a rotor assembly, and the motor is provided with a first lubricating oil channel used for lubricating the stator assembly and / or the rotor assembly; the speed reducer is installed in the second installation cavity and 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 communicates with the first lubricating oil channel. Therefore, the common-shell design of the motor and the speed reducer can be achieved, the size and weight of the drive axle assembly can be 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, extra sealing is not needed between the motor and the speed reducer, and the cost of the drive axle assembly can be reduced. And the practicability of the drive axle assembly is improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicles, and in particular to a drive axle assembly and a vehicle. Background Art

[0002] In the related art, a vehicle has a drive motor and a speed reducer. The drive motor and the speed reducer are connected by a spline and a fastener. However, the lubrication and cooling of the drive motor and the speed reducer are independent of each other, resulting in a high cost. Moreover, the oils of the motor and the speed reducer are different and cannot be compatible, which requires a high dynamic sealing requirement for the drive motor and the speed reducer. Poor handling will cause oil leakage and affect the overall reliability. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a drive axle assembly, which can realize the co-shell design of the motor and the speed reducer, and enables the motor and the speed reducer to share a lubrication system, which is beneficial to reducing the cost.

[0004] The drive axle assembly according to an embodiment of the present invention includes: a housing, in which a first installation cavity and a second installation cavity are provided; a motor, which is installed in the first installation cavity, the motor includes a stator assembly and a rotor assembly, and the motor has a first lubricating oil passage for lubricating the stator assembly and / or the rotor assembly; a speed reducer, which is installed in the second installation cavity, the speed reducer includes an input shaft, the input shaft is connected to the rotor assembly, and the speed reducer has a second lubricating oil passage, and the second lubricating oil passage is communicated with the first lubricating oil passage.

[0005] The drive axle assembly according to an embodiment of the present invention can realize the co-shell design of the motor and the speed reducer by installing the motor and the speed reducer in the housing together, which is beneficial to reducing the volume and weight of the drive axle assembly. And by communicating the first lubricating oil passage and the second lubricating oil passage, the motor and the speed reducer can share a lubrication system, and no additional sealing is required between the motor and the speed reducer, which is beneficial to reducing the cost of the drive axle assembly and improving the practicability of the drive axle assembly.

[0006] In the drive axle assembly according to some embodiments of the present invention, 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 provided in the input shaft, and the first axial flow passage is communicated with the rotor oil passage.

[0007] In the drive axle assembly according to some embodiments of the present invention, the stator assembly includes a stator core and a stator winding, and a stator oil passage is defined between the stator core and the housing. The stator oil passage has a first outlet, and the first outlet is arranged towards the stator winding to guide the oil in the stator oil passage to the stator winding.

[0008] For a drive axle assembly according to some embodiments of the present invention, the stator assembly further includes a first seal. An open end is formed at an end of the stator oil passage. The first seal is connected to the housing and the stator core respectively to seal the open end of the stator oil passage, and the first outflow port is provided on the first seal.

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

[0010] For a drive axle assembly according to some embodiments of the present invention, the first lubricating oil passage further includes a plurality of first oil inlet channels, and the plurality of first oil inlet channels communicate with the stator oil passage.

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

[0012] For a drive axle assembly according to some embodiments of the present invention, a part of the first oil inlet channels are provided with the first flow valve.

[0013] For a drive axle assembly according to some embodiments of the present invention, the housing is provided with an oil inlet and a connecting oil passage. The oil inlet communicates with the first oil inlet channel, and the oil inlet communicates with the second lubricating oil passage through the connecting oil passage.

[0014] For a drive axle assembly according to some embodiments of the present invention, a second flow valve for regulating the flow rate is provided at the inflow end of the first axial flow passage.

[0015] For a drive axle assembly according to some embodiments of the present invention, the rotor assembly includes a rotor shaft. The input shaft is sleeved outside the rotor shaft and fixedly connected to the rotor shaft. A first oil guide pipe is provided inside the input shaft, and the first axial flow passage is formed in the first oil guide pipe.

[0016] For a drive axle assembly according to some embodiments of the present invention, an oil storage cavity for guiding oil to the connection between the input shaft and the rotor shaft is provided inside the input shaft.

[0017] For a drive axle assembly according to some embodiments of the present invention, a second seal is sleeved on the outer peripheral wall of the first oil guide pipe. The oil storage cavity is defined between the second seal and the first oil guide pipe, and a first oil supply hole communicating with the oil storage cavity is provided on the side wall of the first oil guide pipe.

[0018] For a drive axle assembly according to some embodiments 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, for the drive axle assembly, the speed reducer further includes a drive shaft and an output shaft, the drive shaft connects the power of the input shaft and the output shaft, and the second lubricating oil passage includes a second axial flow passage provided in the drive shaft.

[0020] According to some embodiments of the present invention, for the drive axle assembly, an outlet member is connected to the end of the second axial flow passage, and the outlet member is used to convey oil to the second installation cavity.

[0021] According to some embodiments of the present invention, for the drive axle assembly, an oil distribution port is formed on the side wall of the drive shaft, and the oil distribution port communicates with the second axial flow passage.

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

[0023] According to some embodiments of the present invention, for the drive axle assembly, an oil fluid guiding member is sleeved outside the second oil guide pipe, the oil fluid guiding member forms a guiding oil passage, and the guiding oil passage communicates the second oil supply hole with the oil distribution port.

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

[0025] According to some embodiments of the present invention, the drive axle assembly further includes: a bridge housing, the bridge housing forms a receiving port, the bridge housing is in limit cooperation with the housing to form a receiving space at the receiving port, the output shaft is located in the receiving space and is in transmission connection with the bridge housing, and a third sealing member is provided between the bridge housing and the housing, and the third sealing member surrounds the receiving port.

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

[0027] According to some embodiments of the present invention, for the drive axle assembly, there are a plurality of oil return ports, and the plurality of oil return ports are respectively located at both ends of the rotor assembly along the length direction.

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

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

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

[0031] The present invention also provides a vehicle.

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

[0033] The vehicle and the drive axle assembly have the same advantages compared with the prior art, which will not be elaborated herein.

[0034] Some of the additional aspects and advantages of the present invention will be given in the following description, some will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 is a schematic diagram of a drive axle assembly according to an embodiment of the present invention; Figure 2 is a cross-sectional view of a drive axle assembly according to an embodiment of the present invention; Figure 3 is a schematic diagram of a flow path of a drive axle assembly according to an embodiment of the present invention; Figure 4 is a schematic diagram of the installation of a rotor shaft and an input shaft according to an embodiment of the present invention; Figure 5 is a schematic diagram of a speed reducer according to an embodiment of the present invention; Figure 6 is a schematic diagram of a drive shaft according to an embodiment of the present invention; Figure 7 is a schematic diagram of the installation of a second oil pipe according to an embodiment of the present invention; Figure 8 is a schematic diagram of the installation of a bridge housing and a housing according to an embodiment of the present invention; Figure 9 is a schematic diagram of an oil return port according to an embodiment of the present invention; Figure 10 is an exploded view of a housing according to an embodiment of the present invention.

[0036] Reference numerals: Drive axle assembly 100; Housing 1; First housing 11; Second housing 12; First installation cavity 13; Second installation cavity 14; Oil return port 15; Oil supply flow channel 16; Motor 2; Stator assembly 21; Stator core 211; Stator winding 212; First seal 213; Rotor assembly 22; Rotor shaft 221; Rotor core 222; First lubricating oil channel 23; Stator oil channel 231; Rotor oil channel 232; First oil inlet channel 233; Reducer 3; Input shaft 31; Drive shaft 32; Oil distribution port 321; First drive gear 322; Output shaft 33; Second drive gear 331; Second lubricating oil channel 34; First axial flow channel 341; Second axial flow channel 342; First oil guide pipe 35; Second oil guide pipe 36; Second seal 37; Oil storage cavity 371; Liquid outlet part 38; Oil fluid guiding part 39; Axle housing 4; Accommodating port 41; Oil baffle 5; First flow valve 61; Second flow valve 62; Oil return pump 71; Oil cooler 72; Detection part 8; Temperature sensor 81; Pressure sensor 82; First filter element 91; Second filter element 92; Overflow valve 93. Specific implementation manner

[0037] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where 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 by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Next, with reference to the accompanying drawings, the drive axle assembly 100 according to an embodiment of the present invention will be described.

[0040] As Figures 1 - 10 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. A first installation cavity 13 and a second installation cavity 14 are provided inside the housing 1; the motor 2 is installed in the first installation 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 installation cavity 14. The reducer 3 includes an input shaft 31, the input shaft 31 is connected to the rotor assembly 22, and the reducer 3 has a second lubricating oil passage 34, and the second lubricating oil passage 34 communicates with the first lubricating oil passage 23.

[0041] First, as Figures 1 - 2 shown, the drive axle assembly 100 includes a housing 1, a motor 2, and a reducer 3. A first installation cavity 13 and a second installation cavity 14 are provided inside the housing 1. The motor 2 can be installed in the first installation cavity 13. The motor 2 includes a stator assembly 21 and a rotor assembly 22. The stator assembly 21 is sleeved outside the rotor assembly 22, and the stator assembly 21 is coupled with the rotor assembly 22 so that the stator assembly 21 can drive the rotor assembly 22 to rotate around its own axial direction, and the motor 2 has a first lubricating oil passage 23, and the first lubricating oil passage 23 is used for lubricating the stator assembly 21 and / or the rotor assembly 22.

[0042] Exemplarily, 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.

[0043] Meanwhile, the input shaft 31 can be connected to the rotor assembly 22. The rotor assembly 22 is used to drive the input shaft 31 to rotate synchronously, so that the reducer 3 can output power outward. The reducer 3 has a second lubricating oil passage 34, and the second lubricating oil passage 34 is used to lubricate the reducer 3. The second lubricating oil passage 34 is communicated with the first lubricating oil passage 23, so that the oil can flow between the second lubricating oil passage 34 and the first lubricating oil passage 23, so that the lubricating oil can be used to lubricate the reducer 3 and the motor 2 at the same time. It should be noted that the type selection of the oil should take into account the lubrication requirements of the reducer 3 and the motor 2.

[0044] Through the above settings, a co-shell design of the motor 2 and the reducer 3 can be realized, reducing the overlapping surfaces and the required fasteners, making the dimensional accuracy easy to control, which is beneficial to improving the assembly accuracy of the assembly, and can reduce the volume and weight of the drive axle assembly 100. In addition, the motor 2 and the reducer 3 can share the lubrication system, there is no risk of oil leakage, and there is no need for additional sealing between the motor 2 and the reducer 3, which is beneficial to reducing the cost of the drive axle assembly 100.

[0045] For the drive axle assembly 100 according to the embodiment of the present invention, by installing the motor 2 and the reducer 3 together in the housing 1, a co-shell design of the motor 2 and the reducer 3 can be realized, which is beneficial to reducing the volume and weight of the drive axle assembly 100. And by communicating the first lubricating oil passage 23 and the second lubricating oil passage 34, so that the motor 2 and the reducer 3 can share the lubrication system, and there is no need for additional sealing between the motor 2 and the reducer 3, which is beneficial to reducing the cost of the drive axle assembly 100 and improving the practicability of the drive axle assembly 100.

[0046] 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. The second lubricating oil passage 34 includes a first axial flow passage 341 provided on the input shaft 31, and the first axial flow passage 341 is communicated with the rotor oil passage 232.

[0047] For example, referring 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 provided in the stator assembly 21, and the stator oil passage 231 is used to lubricate the stator assembly 21. The rotor oil passage 232 is provided in the rotor assembly 22, and the rotor oil passage 232 is used to lubricate the rotor assembly 22. The second lubricating oil passage 34 includes a first axial flow passage 341, and the first axial flow passage 341 is provided on the input shaft 31, and the first axial flow passage 341 is communicated with the rotor oil passage 232.

[0048] During the specific working process, the oil flowing into the drive axle assembly 100 can be divided into multiple parts. A 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 axial flow passage 341 to cool the input shaft 31 from the inside of the input shaft 31, and then the oil can flow into the rotor oil passage 232 to lubricate and cool the rotor assembly 22.

[0049] Through the above arrangement, the space can be fully utilized, which is beneficial to reducing the size of the housing 1, and the flow path can be simplified, reducing the structural complexity of the drive axle assembly 100 and improving the practicability of the drive axle assembly 100.

[0050] 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, and the first outlet is arranged towards the stator winding 212 for guiding the oil in the stator oil passage 231 to the stator winding 212.

[0051] For example, as shown in Figure 2 the stator assembly 21 includes a stator core 211 and a stator winding 212. The stator core 211 is configured as a cylinder, the stator winding 212 is arranged on the inner peripheral wall of the stator core 211, and the rotor assembly 22 is arranged inside the stator winding 212 and is coupled and matched with the stator winding 212. Among them, a stator oil passage 231 is defined between the outer peripheral wall of the stator core 211 and the inner wall of the housing 1. The stator oil passage 231 has a first outlet, the first outlet is arranged towards the stator winding 212, and the first outlet is used for guiding the oil in the stator oil passage 231 to the stator winding 212, so that the oil can contact the stator winding 212 to cool the stator winding 212. Thus, the stator winding 212 can be efficiently cooled, the working temperature of the stator winding 212 is reduced, and the working stability of the motor 2 is improved.

[0052] In some embodiments of the present invention, as shown in Figure 2 the stator assembly 21 further includes a first seal 213. An open end is formed at the end of the stator oil passage 231. The first seal 213 is configured as a ring. The first seal 213 is arranged on the side of the housing 1 facing the stator winding 212 and is located 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, and the first outlet is arranged on the first seal 213.

[0053] With the above settings, the first seal 213 can separate the stator oil passage 231 from the stator winding 212, better define the stator oil passage 231, avoid uneven heat dissipation caused by disordered oil flow, reduce the forming difficulty of the stator oil passage 231, and improve the practicability of the drive axle assembly 100.

[0054] In some embodiments of the present invention, the first seal 213 includes a main body portion and a sealing portion. The main body portion can be made of a rigid material such as rigid plastic, and the main body portion is provided with a first flow outlet. The sealing portion is disposed on the side of the main body portion facing the stator core 211. The sealing portion can be made of an elastic material such as rubber, and the sealing portion is used to support on the stator core 211 to achieve a sealing fit between the stator core 211 and the main body portion. Thus, the sealing effect of the first seal 213 can be improved.

[0055] In some embodiments of the present invention, the first flow outlet can be provided as multiple ones, and the multiple first flow outlets are arranged at intervals along the circumferential direction of the stator core 211. Thus, the oil can more comprehensively cover the stator winding 212, improve the temperature uniformity of the stator winding 212, and enhance the operation stability of the motor 2.

[0056] In some embodiments of the present invention, as Figure 2 and Figure 3 shown, the first lubricating oil passage 23 further includes a plurality of first oil inlet channels 233, the plurality of first oil inlet channels 233 are arranged at intervals, and the plurality of first oil inlet channels 233 communicate with the stator oil passage 231. Thus, the probability of blockage of the first oil inlet channel 233 can be reduced, the oil supply stability can be improved, and it is beneficial to improve the operation stability of the motor 2.

[0057] In some embodiments of the present invention, as Figure 3 shown, at least one of the first oil inlet channels 233 is provided with a first flow valve 61, and the first flow valve 61 is used to adjust the oil flow rate in the corresponding first oil inlet channel 233. Thus, the total amount of oil in the stator oil passage 231 can be dynamically adjusted, the real-time optimal distribution of the oil amount is realized, and the overall performance of the drive axle assembly 100 is improved.

[0058] In some embodiments of the present invention, as Figure 3 shown, the first flow valve 61 can be provided in a part of the first oil inlet channels 233. Exemplarily, the first oil inlet channels 233 can be provided as three, the three first oil inlet channels 233 are arranged at intervals along the circumferential direction of the stator core 211, and two of the first oil inlet channels 233 are provided with the first flow valve 61. Of course, the first flow valve 61 can also be provided in each of the first oil inlet channels 233, and the present invention does not limit this. Thus, the total amount of oil in the stator oil passage 231 can be adjusted more flexibly, which is beneficial to meet different working conditions.

[0059] In some embodiments of the present invention, as Figure 2 shown, an oil supply flow channel 16 is provided in the housing 1. The oil supply flow channel 16 can connect the first oil inlet channel 233 and the stator oil channel 231, so that the oil in the first oil inlet channel 233 can flow through the oil supply flow channel 16 and into the stator oil channel 231. The oil supply flow channel 16 can also be connected to the first installation cavity 13. The oil supply flow channel 16 is used to supply oil to the bearings provided at the end of the rotor assembly 22 to lubricate the bearings. Thus, the operating stability of the motor 2 can be improved.

[0060] In some embodiments of the present invention, an oil inlet and a connecting oil passage can 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 channel 34 through the connecting oil passage. Thus, the flow paths in the drive axle assembly 100 can share the same oil inlet, which is beneficial to reducing the assembly difficulty of the drive axle assembly 100.

[0061] In some embodiments of the present invention, as Figure 3 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 adjust the oil flow rate in the first axial flow channel 341. Thus, the oil volume in the rotor oil channel 232 can be dynamically adjusted, achieving real-time optimal distribution of the oil volume and improving the overall performance of the drive axle assembly 100.

[0062] In some embodiments of the present invention, as Figure 4 shown, the rotor assembly 22 includes a rotor shaft 221. The input shaft 31 is sleeved outside the rotor shaft 221 and fixedly connected to the rotor shaft 221. A rotor oil channel 232 is provided in 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 is connected to the rotor oil channel 232.

[0063] Through the above settings, the inner diameter of the input shaft 31 can be not limited by the size of the first axial flow channel 341, which is beneficial to realizing the lightweight design of the input shaft 31, and the maximum utilization of the oil can be achieved, improving the practicability of the drive axle assembly 100.

[0064] In some embodiments of the present invention, as Figure 4As shown, the rotor assembly 22 further includes a rotor core 222. The rotor core 222 (including permanent magnets) is sleeved outside the rotor shaft 221 and is used for coupling and cooperation with the stator winding 212. The rotor shaft 221 is provided with a second oil outlet, and the second oil outlet is communicated with the rotor oil passage 232. When the rotor shaft 221 rotates around its own axis, the oil in the rotor oil passage 232 can flow through the second oil outlet to the rotor core 222 and the stator winding 212, and is used for cooling the rotor core 222 and the stator winding 212. Thus, the working temperature of the motor 2 can be reduced, and the operation stability of the motor 2 is improved.

[0065] In some embodiments of the present invention, internal splines may be provided on the inner peripheral wall of the input shaft 31, and external splines may be provided on the outer peripheral wall of the rotor shaft 221. The internal splines can cooperate with the external splines to realize the key connection between the input shaft 31 and the rotor shaft 221. Thus, the assembly difficulty between the input shaft 31 and the rotor shaft 221 can be reduced.

[0066] In some embodiments of the present invention, as Figure 4 shown, an oil storage cavity 371 is provided inside the input shaft 31. The oil storage cavity 371 can be communicated with the first axial flow passage 341 (of course, it can also be other flow paths or spaces with oil). The oil storage cavity 371 is used to guide the 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. Thus, rusting at the connection between the input shaft 31 and the rotor shaft 221 can be prevented, which is beneficial to improving the reliability of the drive axle assembly 100.

[0067] Of course, an oil storage cavity 371 may also be provided at one end of the input shaft 31 away from the rotor shaft 221, so that the oil storage cavity 371 can be used to lubricate the bearing at the end of the rotor shaft 221, which will not be elaborated here.

[0068] In some embodiments of the present invention, as Figure 4 shown, a second seal 37 may be sleeved outside the outer peripheral wall of the first oil guide pipe 35. A storage cavity 371 is defined between the second seal 37 and the first oil guide pipe 35. A first oil supply hole is provided on the side wall of the first oil guide pipe 35, and the first oil supply hole is communicated with the storage cavity 371, so that the oil in the first oil guide pipe 35 can flow into the storage cavity 371 through the first oil supply hole.

[0069] Through the above settings, the structure can be simplified, stable oil supply to the connection between the input shaft 31 and the rotor shaft 221 can be realized, and it is beneficial to prevent oil backflow and waste, and the reliability of the drive axle assembly 100 is improved.

[0070] In some embodiments of the present invention, as Figure 4As shown, the second seal 37 can be set to support 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 and fluororubber. Thus, the sealing performance of the oil storage cavity 371 can be improved, which is conducive to reducing the probability of leakage of the oil storage cavity 371.

[0071] In some embodiments of the present invention, as Figures 5 - 7 shown, the speed reducer 3 further includes a transmission shaft 32 and an output shaft 33. The transmission shaft 32 is power-connected to 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 transmission shaft 32 to output power outward. The second lubricating oil passage 34 includes a second axial flow passage 342. The second axial flow passage 342 is arranged in the transmission shaft 32 and is used for lubricating the transmission shaft 32.

[0072] Through the above settings, the space inside the transmission shaft 32 can be fully utilized, the oil passage inside the housing 1 is reduced, which is conducive to simplifying the structure of the drive axle assembly 100 and improving the practicability of the drive axle assembly 100.

[0073] In some embodiments of the present invention, as Figure 7 shown, a liquid outlet member 38 is connected to the end of the second axial flow passage 342. The liquid outlet member 38 can be configured as a nozzle and is used for delivering oil into the second installation cavity 14. Thus, each component of the speed reducer 3 (such as gears, bearings, etc.) can be fully lubricated, which is conducive to improving the running stability of the speed reducer 3 and enhancing the reliability of the drive axle assembly 100.

[0074] In some embodiments of the present invention, as Figure 7 shown, it can be set that an oil distribution port 321 is formed on the side wall of the transmission shaft 32. The oil distribution port 321 is communicated with the second axial flow passage 342. When the transmission shaft 32 rotates, the oil in the second axial flow passage 342 can be thrown out from the oil distribution port 321 to lubricate the components in the second installation cavity 14. Thus, the circulation efficiency of the oil can be accelerated, and the coverage range of the oil can be wider, improving the lubrication effect of the oil on the speed reducer 3.

[0075] In some embodiments of the present invention, as Figure 7 shown, a second oil guide pipe 36 is arranged in the transmission shaft 32. A second axial flow passage 342 is formed in the second oil guide pipe 36, and a second oil supply hole is arranged on the side wall of the second oil guide pipe 36. The second oil supply hole is communicated with the oil distribution port 321. When the transmission shaft 32 rotates, the oil in the second axial flow passage 342 can flow out from the second oil supply hole and flow into the second installation cavity 14 through the oil distribution port 321 to lubricate the components in the second installation cavity 14.

[0076] With the above settings, the inner diameter of the transmission shaft 32 is not limited by the size of the second axial flow channel 342, which is beneficial to realizing the lightweight design of the transmission shaft 32, and can maximize the utilization of the oil fluid, improving the practicability of the drive axle assembly 100.

[0077] Of course, as Figure 6 shown, it is also possible to set the second axial flow channel 342 to be directly defined by the inside of the transmission shaft 32. Thus, the structure can be simplified and the processing difficulty of the transmission shaft 32 can be reduced.

[0078] In some embodiments of the present invention, as Figures 6 - 7 shown, there are multiple transmission shafts 32. Among them, it can be set that the second axial flow channels 342 of the multiple transmission shafts 32 are all defined by the second oil guide pipe 36; or, it can be set that the second axial flow channels 342 of the multiple transmission shafts 32 are all directly defined by the inner wall of the transmission shaft 32; or, it can be set that the second axial flow channels 342 of a part of the transmission shafts 32 are defined by the second oil guide pipe 36, and the second axial flow channels 342 of another part of the transmission shafts 32 are directly defined by the inner wall of the transmission shaft 32. The present invention does not limit this. Thus, it is beneficial to meet different design requirements.

[0079] In some embodiments of the present invention, as Figure 7 shown, an oil fluid diversion member 39 can be sleeved outside the second oil guide pipe 36. The oil fluid diversion member 39 forms a guiding oil path for communicating the second oil supply hole with the oil distribution port 321. It should be noted that the material of the oil fluid diversion member 39 can be any one of materials such as plastic and rubber.

[0080] With the above settings, the flow stability of the oil fluid can be improved, so that the oil distribution port 321 can continuously and stably supply oil into the second installation cavity 14, and an oil-free space can be defined between the oil fluid diversion member 39 and the inner wall of the transmission shaft 32, which can prevent a large amount of oil fluid from accumulating in the transmission shaft 32 and is beneficial to improving the operation stability of the transmission shaft 32.

[0081] Of course, the present invention is not limited to this. It is also possible to integrally form the second oil guide pipe 36 and the oil fluid diversion member 39. Thus, the installation steps are reduced and the installation difficulty is lowered.

[0082] In some embodiments of the present invention, as Figure 5 shown, the transmission shaft 32 is connected with a first transmission gear 322, and the output shaft 33 is connected with a second transmission gear 331. The first transmission gear 322 and the second transmission gear 331 are in transmission cooperation. Among them, an oil baffle 5 can be provided on at least one side of the first transmission gear 322; and / or, an oil baffle 5 can be provided on at least one side of the second transmission gear 331.

[0083] Specifically, an oil baffle plate 5 can be provided on one side of the first transmission gear 322, and the oil baffle plate 5 and the side wall of the second mounting cavity 14 are combined to limit 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, thereby reducing the oil stirring loss of the transmission shaft 32; at the same time, oil baffle plates 5 can be provided on the opposite sides of the second transmission gear 331, respectively. The two oil baffle plates 5 are combined to limit 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, thereby reducing the oil stirring loss of the output shaft 33.

[0084] It should be noted that encirclement does not mean complete encirclement, and 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; and when there are multiple transmission shafts 32, the transmission shaft 32 at a higher position does not need to be equipped with an oil baffle 5.

[0085] It can be understood that 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, reduces the oil stirring loss, improves the transmission efficiency, but also meets the lubrication and heat dissipation requirements, and improves the design rationality of the drive axle assembly 100.

[0086] In some embodiments of the present invention, Figure 8 As shown, the drive axle assembly 100 of the embodiment of the present invention further includes: an axle housing 4, with a receiving opening 41 formed in the middle portion of the axle housing 4. The axle housing 4 is limitedly engaged with the housing 1. A cover is provided on the side of the axle housing 4 facing 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 receiving space at the receiving opening 41. The output shaft 33 is located in the receiving space and is transmission-connected to the axle housing 4. The housing 1 is provided with an oil port, which is connected to the receiving space so that oil can flow from the oil port into the receiving space, thereby allowing the motor 2, the reducer 3, and the axle housing 4 to share a lubrication system. A third seal can be provided between the axle housing 4 and the housing 1. The third seal is annular in shape and is disposed around the receiving opening 41 to seal the receiving space.

[0087] It should be noted that the third sealing member can be made of an elastic material such as fluororubber or silicone rubber, or can be constructed of steel rubber. Of course, the housing 1 and the axle housing 4 can also be directly mounted and sealed using a sealant, which is not limited in the present invention.

[0088] Through the above arrangement, the gap between the axle housing 4 and the housing 1 can be effectively sealed, oil leakage can be prevented, and the reliability of the drive axle assembly 100 is improved.

[0089] In some embodiments of the present invention, Figure 9As shown, an oil return port 15 can be provided at the bottom of the first installation cavity 13, and an oil collecting area is formed at the bottom of the second installation cavity 14. The oil return port 15 is communicated with the second installation cavity 14, and the oil return port 15 is used to introduce the oil in the first installation cavity 13 into the second installation cavity 14 and store it in the oil collecting area.

[0090] During the specific working process, when the drive axle assembly 100 starts to operate, the oil flows into the oil inlet. The oil flowing into the oil inlet is divided into two parts. One part of the oil directly flows 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 the stator winding 212, and then the oil can drip onto the bottom of the first installation cavity 13 and flow into the second installation cavity 14 through the oil return port 15. The other part of the oil can flow to the other side of the housing 1 through the communication oil passage. The oil can flow into the first axial flow passage 341 and the second axial flow passage 342 respectively. The oil flowing into the first axial flow passage 341 can flow into the rotor oil passage 232. The oil in the rotor oil passage 232 can flow out from the second outlet into the first installation cavity 13 and flow into the second installation cavity 14 through the oil return port 15. The oil flowing into the second axial flow passage 342 can flow out to the second installation cavity 14 through the liquid outlet part 38 and the oil distribution port 321 and lubricate the components in the second installation cavity 14. The oil flowing into the second installation cavity 14 can be concentrated in the oil collecting area.

[0091] Through the above settings, centralized storage of the oil can be achieved, which is beneficial to subsequent operations and improves the design rationality of the drive axle assembly 100.

[0092] In some embodiments of the present invention, as Figure 9 shown, multiple oil return ports 15 can be provided, and the multiple oil return ports 15 are respectively located at both ends of the rotor assembly 22 along the length direction. Through the above settings, the drive axle assembly 100 can return oil in different postures, avoiding problems such as inefficient oil return on one side and uneven heat dissipation caused by oil accumulation under postures such as vehicle roll, and improving the running stability of the drive axle assembly 100.

[0093] In some embodiments of the present invention, the drive axle assembly 100 of the embodiments of the present invention further includes: an oil return pump 71 and an oil cooler 72. The oil return pump 71 is used to extract the oil in the second installation cavity 14 into the oil cooler 72, and the oil cooler 72 is used to cool the oil.

[0094] For example, referring to Figure 3As shown, the drive axle assembly 100 further includes an oil return pump 71 and an oil cooler 72. The liquid inlet end of the oil return pump 71 communicates with the oil collecting area of the second installation cavity 14. The liquid outlet end of the oil return pump 71 communicates with the oil cooler 72. The oil return pump 71 is used to extract the oil liquid in the second installation cavity 14 into the oil cooler 72. The oil cooler 72 is used to cool the oil liquid. The oil cooler 72 communicates with the oil inlet. The oil cooler 72 can introduce the cooled oil liquid into the oil inlet. Thus, the oil liquid can be recycled within the drive axle assembly 100, improving the integration of the drive axle assembly 100.

[0095] In some embodiments of the present invention, as Figure 3 shown, the drive axle assembly 100 of the embodiment of the present invention further includes: a detection member 8. The detection member 8 is arranged at the inlet end of the oil cooler 72. The detection member 8 includes at least one of a temperature sensor 81 and a pressure sensor 82. Exemplarily, the detection member 8 can be set as the temperature sensor 81; or, the detection member 8 can be set as the pressure sensor 82; or, the detection member 8 can be set to include the temperature sensor 81 and the pressure sensor 82. The present invention does not limit this.

[0096] It can be understood that the temperature sensor 81 can be used to detect the temperature of the oil liquid. The management system can control the rotation speed of the oil return pump 71 according to the temperature of the oil liquid (that is, the higher the temperature of the oil liquid, the faster the rotation speed of the oil return pump 71); while the pressure sensor 82 is used to detect the pressure of the oil liquid. When the pressure of the oil liquid is insufficient, oil liquid can be supplemented into the drive axle assembly 100 to ensure that the motor 2 and the reducer 3 can be fully cooled, improving the reliability of the drive axle assembly 100.

[0097] In some embodiments of the present invention, as Figure 3 shown, the drive axle assembly 100 of the embodiment of the present invention further includes: a first filter element 91 and a second filter element 92. The first filter element 91 is located at the liquid inlet end of the oil return pump 71. The first filter element 91 is used to filter the oil liquid flowing towards the oil return pump 71 to prevent impurities from accumulating in the oil return pump 71. The second filter element 92 is located at the oil inlet end of the oil cooler 72. The second filter element 92 is used to perform secondary filtration on the oil liquid flowing towards the oil cooler 72 to prevent impurities from accumulating in the oil cooler 72. Thus, the service life of the drive axle assembly 100 can be improved.

[0098] In some embodiments of the present invention, as Figure 3 shown, the drive axle assembly 100 of the embodiment of the present invention further includes an overcurrent valve 93. The overcurrent valve 93 is connected between the liquid outlet end of the oil return pump 71 and the oil inlet. When the pressure at the liquid outlet end of the oil return pump 71 is too high, the overcurrent valve 93 can be opened to directly guide the oil liquid into the oil inlet. Thus, it can be avoided that the motor 2 and the reducer 3 have insufficient oil supply, improving the operation stability of the drive axle assembly 100.

[0099] In some embodiments of the present invention, as Figure 10 shown, the housing 1 includes a first housing 11 and a second housing 12. The first housing 11 defines a first installation cavity 13, and the first housing 11 cooperates with the second housing 12 to define a second installation cavity 14. Thereby, the molding difficulty of the housing 1 can be reduced, and the practicability of the drive axle assembly 100 is improved.

[0100] The present invention also provides a vehicle.

[0101] The vehicle according to an embodiment of the present invention includes: the drive axle assembly 100 according to any one of the above embodiments.

[0102] For the vehicle according to an embodiment of the present invention, the drive axle assembly 100 is small in volume, light in weight and low in cost, which can make the vehicle easy to arrange, and can reduce the overall weight and cost of the vehicle, thereby improving the product competitiveness of the vehicle.

[0103] In the description of the present specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0104] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A driving axle assembly, characterized in that, Comprising: A housing (1), within which a first mounting cavity (13) and a second mounting cavity (14) are provided; A motor (2), which is mounted within 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); A speed reducer (3), which is mounted within the second mounting cavity (14), the speed reducer (3) includes an input shaft (31), the input shaft (31) is connected to the rotor assembly (22), and the speed reducer (3) has a second lubricating oil passage (34), and the second lubricating oil passage (34) is communicated with the first lubricating oil passage (23).

2. The drive axle assembly according to claim 1, wherein, 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) provided in the input shaft (31), and the first axial flow passage (341) is communicated with the rotor oil passage (232).

3. The drive axle assembly according to claim 2, wherein, 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), and the stator oil passage (231) has a first flow outlet, and the first flow outlet is arranged towards the stator winding (212) for guiding the oil in the stator oil passage (231) to the stator winding (212).

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

5. The drive axle assembly according to claim 3, wherein The first lubricating oil passage (23) further includes a plurality of first oil inlet channels (233), and the plurality of first oil inlet channels (233) are communicated with the stator oil passage (231).

6. The drive axle assembly according to claim 5, wherein, At least one of the first oil inlet channels (233) is provided with a first flow valve (61) for regulating the flow rate.

7. The drive axle assembly according to claim 6, characterized in that, Some of the first oil inlet channels (233) are provided with the first flow valve (61).

8. The drive axle assembly according to claim 5, characterized in that, The housing (1) is provided with an oil inlet and a connecting oil passage, the oil inlet is communicated with the first oil inlet channel (233), and the oil inlet is communicated with the second lubricating oil passage (34) through the connecting oil passage.

9. The drive axle assembly according to claim 2, wherein, A second flow valve (62) for regulating the flow rate is provided at the inlet end of the first axial flow passage (341).

10. The drive axle assembly according to claim 2, characterized in that, The rotor assembly (22) includes a rotor shaft (221), the input shaft (31) is sleeved outside the rotor shaft (221) and fixedly connected to the rotor shaft (221), and a first oil guide pipe (35) is provided inside the input shaft (31), and the first axial flow passage (341) is formed in the first oil guide pipe (35).

11. The drive axle assembly according to claim 10, characterized in that, An oil storage cavity (371) for guiding oil to the connection between the input shaft (31) and the rotor shaft (221) is provided inside the input shaft (31).

12. The drive axle assembly according to claim 11, characterized in that, A second seal (37) is sleeved on the outer peripheral wall of the first oil pipe (35). An oil storage cavity (371) is defined between the second seal (37) and the first oil pipe (35). A first oil supply hole communicating with the oil storage cavity (371) is provided on the side wall of the first oil pipe (35).

13. The drive axle assembly according to claim 12, characterized in that, The second seal (37) is supported on the inner wall of the input shaft (31).

14. The drive axle assembly according to any one of claims 1-13, characterized in that, The speed reducer (3) further includes a transmission shaft (32) and an output shaft (33). The transmission shaft (32) is power-connected to the input shaft (31) and the output shaft (33). The second lubricating oil passage (34) includes a second axial flow passage (342) provided in the transmission shaft (32).

15. The drive axle assembly according to claim 14, characterized in that, An outlet member (38) is connected to the end of the second axial flow passage (342). The outlet member (38) is used for conveying oil into the second installation cavity (14).

16. The drive axle assembly according to claim 14, characterized in that, An oil distribution port (321) is formed on the side wall of the transmission shaft (32). The oil distribution port (321) communicates with the second axial flow passage (342).

17. The drive axle assembly according to claim 16, wherein A second oil pipe (36) is provided in the transmission shaft (32). The second axial flow passage (342) is formed in the second oil pipe (36). A second oil supply hole is provided on the side wall of the second oil pipe (36). The second oil supply hole communicates with the oil distribution port (321).

18. The drive axle assembly according to claim 17, wherein An oil guiding member (39) is sleeved outside the second oil pipe (36). The oil guiding member (39) forms a guiding oil passage which communicates the second oil supply hole with the oil distribution port (321).

19. The drive axle assembly according to claim 15, wherein, The transmission shaft (32) is connected with a first transmission gear (322). The output shaft (33) is connected with a second transmission gear (331). The first transmission gear (322) is in transmission cooperation with the second transmission gear (331); wherein, 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).

20. The drive axle assembly according to claim 14, characterized in that, Further included is: A bridge housing (4) forms a receiving opening (41). The bridge housing (4) is in limit cooperation with the housing (1) to form a receiving space at the receiving opening (41). The output shaft (33) is located in the receiving space and is in transmission connection with the bridge housing (4). A third seal is provided between the bridge housing (4) and the housing (1). The third seal is arranged around the receiving opening (41).

21. The drive axle assembly according to claim 1, characterized in that, An oil return port (15) is provided at the bottom of the first installation cavity (13). The oil return port (15) communicates with the second installation cavity (14).

22. The drive axle assembly according to claim 21, characterized in that, There are multiple oil return ports (15). The multiple oil return ports (15) are respectively located at both ends of the rotor assembly (22) in the length direction.

23. The drive axle assembly according to claim 21, characterized in that, Further included is: An oil return pump (71) and an oil cooler (72), the oil return pump (71) is used to extract the oil in the second installation cavity (14) into the oil cooler (72), and the oil cooler (72) is used to cool the oil.

24. The drive axle assembly according to claim 23, wherein, It further includes: A detection member (8), the detection member (8) is arranged at the inlet end of the oil cooler (72), and the detection member (8) includes at least one of a temperature sensor (81) and a pressure sensor (82).

25. The drive axle assembly according to claim 1, wherein, The housing (1) includes a first housing (11) and a second housing (12), the first housing (11) defines the first installation cavity (13), and the first housing (11) cooperates with the second housing (12) to define the second installation cavity (14).

26. A vehicle, characterized in that, It includes: The drive axle assembly (100) according to any one of claims 1-25.

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