Electric drive assembly and vehicle

Abstract

The embodiment of the utility model provides an electric drive assembly and a vehicle. The electric drive assembly comprises a motor, a differential mechanism and a speed reducer. The differential mechanism is arranged in the motor and is connected with the motor; at least part of the speed reducer extends into the motor and is connected with the differential mechanism; wherein the motor, the differential mechanism and the speed reducer are coaxially arranged. According to the electric drive assembly, the differential mechanism is arranged in the motor, the motor, the differential mechanism and the speed reducer are coaxially arranged, and therefore compact arrangement of all parts can be achieved, the overall size of the electric drive assembly can be reduced, and miniaturization design of the electric drive assembly is facilitated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vehicles, and particularly relates to an electric drive assembly and a vehicle. BACKGROUND

[0002] With the increasing improvement of environmental protection and emission standards, new energy vehicles are rapidly developed due to their advantages of being clean, efficient and low-carbon. The core component of a new energy vehicle is an electric drive assembly, which can provide a power source for the new energy vehicle.

[0003] In the related art, to meet different working conditions of a vehicle, an electric drive assembly usually includes multiple components such as a motor, a differential and a reducer, so that the overall size of the electric drive assembly is large. CONTENT OF THE UTILITY MODEL

[0004] The application aims to provide an electric drive assembly and a vehicle to solve the problem of a large overall size of an existing electric drive assembly.

[0005] To solve the above technical problem, the application is implemented as follows:

[0006] In a first aspect, the application discloses an electric drive assembly, comprising: a motor, a differential and a reducer.

[0007] The differential is arranged in the motor and connected with the motor.

[0008] At least part of the reducer extends into the motor and is connected with the differential.

[0009] The motor, the differential and the reducer are coaxially arranged.

[0010] Optionally, the motor comprises a hollow motor shaft.

[0011] The differential is fixedly connected in the motor shaft.

[0012] The reducer comprises coaxially arranged input and output shafts, at least part of the input shaft extends into the motor shaft and is drivingly connected with the differential, and the output shaft is used for drivingly connecting with a wheel end.

[0013] Optionally, two reducers are arranged symmetrically at two ends of the motor shaft in the axial direction.

[0014] Optionally, the reducer is a multi-stage coaxial reducer.

[0015] Optionally, the multi-stage coaxial reducer is a two-stage coaxial reducer.

[0016] Optionally, the secondary coaxial speed reducer further comprises an intermediate shaft, the intermediate shaft is arranged in parallel with the input shaft, and the intermediate shaft is provided with a primary speed reduction driven gear and a secondary speed reduction driving gear;

[0017] The input shaft is provided with a primary speed reduction driving gear, and the primary speed reduction driving gear is engaged with the primary speed reduction driven gear.

[0018] The output shaft is provided with a secondary speed reduction driven gear, and the secondary speed reduction driven gear is engaged with the secondary speed reduction driving gear.

[0019] Optionally, the input shaft is provided with an input shaft gear at one end close to the differential.

[0020] The differential comprises a planetary shaft and a planetary gear, the planetary shaft is fixedly connected to the motor shaft, and the planetary gear is sleeved on the planetary shaft and engaged with the input shaft gear.

[0021] Optionally, the planetary shaft is a cross shaft, and the cross shaft comprises four shaft rods extending in the radial direction of the motor shaft and perpendicular to each other.

[0022] The planetary gear is provided with four planetary gears, and one planetary gear is sleeved on one shaft rod.

[0023] Optionally, the electric drive assembly further comprises a housing and a liquid suction pump fixedly connected to the outside of the housing, and the housing is used to accommodate the motor and the speed reducer.

[0024] The housing is formed with a liquid storage area, and the liquid storage area is used to store a cooling lubricating medium.

[0025] The housing is provided with a liquid inlet channel and a liquid outlet channel, the liquid inlet channel and the liquid outlet channel are respectively communicated with the liquid suction pump, one end of the liquid inlet channel away from the liquid suction pump is communicated with the liquid storage area, and one end of the liquid outlet channel away from the liquid suction pump extends to the motor and / or the speed reducer, so as to realize cooling and / or lubrication of the motor and / or the speed reducer.

[0026] Optionally, the speed reducer comprises a first speed reducer and a second speed reducer, and the liquid suction pump comprises a first liquid suction pump and a second liquid suction pump.

[0027] The liquid inlet channel comprises a first liquid inlet channel and a second liquid inlet channel, and the liquid outlet channel comprises a first liquid outlet channel and a second liquid outlet channel, the first liquid inlet channel and the first liquid outlet channel are respectively communicated with

[0028] The first liquid suction pump is communicated, one end of the first liquid outlet channel extending to the motor and the first speed reducer away from the first liquid suction pump, the second liquid inlet channel and the second liquid outlet channel being respectively communicated with the second liquid suction pump, and one end of the second liquid outlet channel extending to the motor and the second speed reducer away from the second liquid suction pump;

[0029] At least part of the first liquid outlet channel and the second liquid outlet channel are communicated.

[0030] Optionally, the first liquid inlet channel comprises a first liquid inlet, and the first liquid inlet is communicated with the liquid storage area; and the second liquid inlet channel comprises a second liquid inlet, and the second liquid inlet is communicated with the liquid storage area.

[0031] The first liquid inlet and the second liquid inlet are centrally symmetrically arranged about a center point of the shell.

[0032] Optionally, the electric drive assembly is connected to a vehicle body, and the vehicle body has a front end and a rear end which are away from each other in the length direction of the vehicle body.

[0033] The first liquid inlet is arranged close to the rear end, and the second liquid inlet is arranged close to the front end.

[0034] Optionally, the first liquid outlet channel comprises a first main liquid channel, a first motor liquid channel and a first speed reducer liquid channel, the first main liquid channel comprises two ends which are arranged away from each other, one end of which is communicated with the first liquid suction pump, and the other end is communicated with the first motor liquid channel and the first speed reducer liquid channel.

[0035] The second liquid outlet channel comprises a second main liquid channel, a second motor liquid channel and a second speed reducer liquid channel, the second main liquid channel comprises two ends which are arranged away from each other, one end of which is communicated with the second liquid suction pump, and the other end is communicated with the second motor liquid channel and the second speed reducer liquid channel.

[0036] The first motor liquid channel is communicated with the second motor liquid channel.

[0037] Optionally, the motor further comprises a rotor, a stator and two liquid injection rings.

[0038] The rotor is sleeved on the motor shaft.

[0039] The stator is sleeved on the rotor and fixedly connected with the shell, and the stator is provided with a stator cooling channel extending in the axial direction of the stator.

[0040] The two liquid injection rings are respectively arranged at the two ends of the stator in the axial direction, and one of the liquid injection rings and the stator and the shell form a cooling chamber.

[0041] Two of the cooling chambers are in communication with the stator cooling channel, and one of the two cooling chambers is in communication with the first motor liquid channel, and the other is in communication with the second motor liquid channel.

[0042] Optionally, the liquid spraying ring is provided with a liquid spraying hole, which communicates the cooling chamber and the liquid storage area.

[0043] Optionally, the first reducer comprises a plurality of first lubricated parts to be cooled, and the first reducer channel is provided with a plurality of first liquid outlets, one of which corresponds to the position of one of the first lubricated parts to be cooled.

[0044] The second reducer comprises a plurality of second lubricated parts to be cooled, and the second reducer channel is provided with a plurality of second liquid outlets, one of which corresponds to the position of one of the second lubricated parts to be cooled.

[0045] Optionally, the electric drive assembly further comprises a one-way valve arranged at the outlet of the liquid suction pump or in the liquid outlet channel, which is used to guide the one-way flow of the cooling lubricating medium.

[0046] Optionally, the shell comprises a motor shell and two reducer shells, the two reducer shells are oppositely arranged, and the motor shell is arranged between the two reducer shells.

[0047] The motor shell is provided with a first accommodating cavity for accommodating the motor.

[0048] One of the reducer shells and the motor shell enclose a second accommodating cavity, and one of the second accommodating cavities is used to accommodate one of the reducers.

[0049] Optionally, the motor shell and at least one of the reducer shells are integrally arranged.

[0050] In a second aspect, the application also discloses a vehicle comprising the electric drive assembly.

[0051] In the embodiments of the application, by arranging the differential in the motor, and coaxially arranging the motor, the differential and the reducer, compact arrangement of the components can be realized, so that the overall size of the electric drive assembly can be reduced, which is beneficial to the miniaturization design of the electric drive assembly.

[0052] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned from the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0053] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the references to the following drawings, of which:

[0054] Figure 1 is a structural schematic diagram of an electric drive assembly provided by the embodiments of the present application;

[0055] Figure 2 is a structural schematic diagram of an electric drive assembly provided by the embodiments of the present application;

[0056] Figure 3 is a structural schematic diagram of a speed reducer provided by the embodiments of the present application;

[0057] Figure 4 is a cooperation schematic diagram of a speed reducer and a differential provided by the embodiments of the present application;

[0058] Figure 5 is a structural schematic diagram of a stator core provided by the embodiments of the present application;

[0059] Figure 6 is a structural schematic diagram of a liquid spraying ring provided by the embodiments of the present application;

[0060] Figure 7 is a fluid domain of a liquid outlet channel provided by the embodiments of the present application;

[0061] Figure 8 is a liquid supply schematic diagram of a liquid suction pump (under normal working conditions of a vehicle) provided by the embodiments of the present application;

[0062] Figure 9 is a liquid supply schematic diagram of a liquid suction pump (under uphill working conditions of a vehicle) provided by the embodiments of the present application;

[0063] Figure 10 is a structural schematic diagram of a first speed reducer housing (under uphill working conditions of a vehicle) provided by the embodiments of the present application;

[0064] Figure 11 is a structural schematic diagram of a second speed reducer housing (under uphill working conditions of a vehicle) provided by the embodiments of the present application.

[0065] Reference numerals: 1. housing, 11. motor housing, 111. first accommodating cavity, 112. side plate, 12. reducer housing, 121. first reducer housing, 1211. first liquid inlet, 122. second reducer housing, 1221. second liquid inlet, 123. second accommodating cavity, 124. bearing support plate, 2. motor, 21. motor shaft, 22. rotor, 23. stator, 231. stator core, 2311. stator cooling channel, 232. stator winding, 24. liquid injection ring, 241. first annular connecting part, 2411. liquid injection hole, 242. second annular connecting part, 3. differential, 31. planetary shaft, 32. planetary gear, 4. reducer, 41. input shaft, 411. input shaft gear, 412. primary reduction driving gear, 413. first bearing, 414. second bearing, 42. intermediate shaft, 421. primary reduction driven gear, 422. secondary reduction driving gear, 423. third bearing, 424. fourth bearing, 43. output shaft, 431. secondary reduction driven gear, 432. fifth bearing, 433. sixth bearing, 44. first reducer, 45. second reducer, 5. liquid suction pump, 51. first liquid suction pump, 52. second liquid suction pump. DETAILED DESCRIPTION

[0066] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent 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 application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0067] The terms "first", "second" in the specification and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally represents that the front and rear associated objects are in a "or" relationship.

[0068] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by 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" is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0069] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0070] The application embodiment provides an electric drive assembly, and the electric drive assembly of the application is described in detail below with reference to the drawings.

[0071] Referring to Figures 1-2 , a structural schematic diagram of an electric drive assembly provided by the application embodiment is shown, referring to Figure 3 , a structural schematic diagram of a reducer provided by the application embodiment is shown, referring to Figure 4 , a cooperation schematic diagram of the reducer and the differential provided by the application embodiment is shown, referring to Figure 5 , a structural schematic diagram of a stator core provided by the application embodiment is shown, referring to Figure 6 , a structural schematic diagram of a liquid spraying ring provided by the application embodiment is shown, referring to Figure 7 , a fluid domain of a liquid outlet channel provided by the application embodiment is shown, referring to Figure 8 , a liquid supply schematic diagram of a liquid suction pump (under normal working conditions of a vehicle) provided by the application embodiment is shown, referring to Figure 9 , a liquid supply schematic diagram of a liquid suction pump (under uphill working conditions of a vehicle) provided by the application embodiment is shown, referring to Figure 10 , a structural schematic diagram of a first reducer housing (under uphill working conditions of a vehicle) provided by the application embodiment is shown, referring to Figure 11 , a structural schematic diagram of a second reducer housing (under uphill working conditions of a vehicle) provided by the application embodiment is shown.

[0072] As Figures 1-2As shown, the application provides an electric drive assembly, comprising: an electric motor 2, a differential 3, and a reducer 4; the differential 3 is arranged in the electric motor 2 and connected with the electric motor 2; at least part of the reducer 4 extends into the electric motor 2 and is connected with the differential 3; wherein the electric motor 2, the differential 3, and the reducer 4 are coaxially arranged.

[0073] In the embodiment of the application, by arranging the differential 3 in the electric motor 2 and coaxially arranging the electric motor 2, the differential 3, and the reducer 4, the compact arrangement of each component can be achieved, thereby the size of the whole electric drive assembly can be reduced, which is conducive to the miniaturization design of the electric drive assembly.

[0074] In some optional embodiments of the application, the electric motor 2 comprises a hollow motor shaft 21; the differential 3 is fixedly connected in the motor shaft 21; the reducer 4 comprises coaxially arranged input and output shafts 41 and 43, at least part of the input shaft 41 extends into the motor shaft 21 and is in driving connection with the differential 3, and the output shaft 43 is used to be in driving connection with a wheel end.

[0075] In the embodiment of the application, on the one hand, by the fixed connection of the motor shaft 21 and the differential 3, the driving connection of the differential 3 and the reducer input shaft 41, and the driving connection of the reducer output shaft 43 and the wheel end, the differential and then the reduction of the electric drive assembly can be achieved. On the other hand, by arranging the differential 3 in the motor shaft 21, not only the load of the differential 3 can be reduced to realize the miniaturization of the differential 3, but also the compact arrangement can be achieved, which is conducive to the miniaturization design of the whole electric drive assembly.

[0076] In some optional embodiments of the application, two reducers 4 are arranged, and the two reducers 4 are symmetrically arranged at the two ends of the motor shaft 21 in the axial direction. In this way, by dividing the output power of the electric motor 2 through the two reducers, the input torque of a single reducer 4 can be effectively reduced, the strength safety factor of the reducer 4 can be improved, the NVH (Noise, Vibration, Harshness) performance can be improved, the gear meshing loss can be reduced, and the overall efficiency of the reducer 4 can be improved.

[0077] In some optional embodiments of the application, the reducer 4 is a multi-stage coaxial reducer. In one embodiment, the multi-stage coaxial reducer is a two-stage coaxial reducer. Specifically, as shown in the figure, Figure 3 the two-stage coaxial reducer further comprises an intermediate shaft 42, the intermediate shaft 42 is arranged in parallel with the input shaft 41, the intermediate shaft 42 is provided with a first-stage reduction driven gear 421 and a second-stage reduction driving gear 422; the input shaft 41 is provided with a first-stage reduction driving gear 412, the first-stage reduction driving gear 412 is in mesh with the first-stage reduction driven gear 421; and the output shaft 43 is provided with a second-stage reduction driven gear 431, the second-stage reduction driven gear 431 is in mesh with the second-stage reduction driving gear 422.

[0078] In the related art, the speed reducer 4 usually adopts a planetary reducer, which has a complex structure and a maximum speed ratio generally not more than 10. However, the two-stage coaxial speed reducer adopted in the present application has a simple structure and a flexible speed ratio design, which can adjust the speed ratio according to the performance of the motor 2 and the demand of the whole vehicle, not only reducing the processing and assembly difficulty of the electric drive assembly, but also improving the universality of the electric drive assembly. In addition, through the coaxial arrangement of the input shaft 41 and the output shaft 43, and the parallel arrangement of the input shaft 41 and the intermediate shaft 42, the structure of the speed reducer 4 is more compact, occupying less space, which can realize the further miniaturization of the electric drive assembly, and is beneficial to reduce the manufacturing cost of the electric drive assembly.

[0079] It should be noted that in one embodiment, the input shaft 41 and the primary reduction driving gear 412 and the input shaft gear 411 referred to later can be an integral structure; the intermediate shaft 42 and the primary reduction driven gear 421 and the secondary reduction driving gear 422 can be an integral structure; the output shaft 43 and the secondary reduction driven gear 431 can be an integral structure. In this way, the assembly process of the speed reducer 4 can be simplified.

[0080] In some optional embodiments of the present application, as shown in Figure 2 The housing 1 includes a motor housing 11 and two speed reducer housings 121, the two speed reducer housings 121 are oppositely arranged, and the motor housing 11 is arranged between the two speed reducer housings 121; the motor housing 11 is provided with a first accommodating cavity 111 for accommodating the motor 2; one of the speed reducer housings 121 and the motor housing 11 enclose a second accommodating cavity 123, and the second accommodating cavity 123 is used to accommodate one of the speed reducers 4. Specifically, the motor housing 11 and the speed reducer housing 121 are connected by bolts and sealed by sealing members.

[0081] In the embodiments of the present application, since the first accommodating cavity 111 and the second accommodating cavity 123 are arranged independently, the motor 2 is arranged in the first accommodating cavity 111 and the speed reducer is arranged in the second accommodating cavity 123, so as to subsequently lubricate and / or cool the motor 2 and / or the speed reducer, which is beneficial to improve the lubrication effect and cooling effect of the electric drive assembly. It can be understood that when the motor housing 11 is a symmetrical structure and the structures of the two oppositely arranged speed reducer housings 121 are the same, the structure of the housing 1 can be simplified, and the manufacturing cost of the electric drive assembly can be reduced.

[0082] In actual applications, in order to improve the overall structural strength of the electric drive assembly, simplify the assembly process, the motor shell 11 can be provided in an integrated structure with at least one reducer shell 121. Specifically, in one embodiment, the motor shell 11 is provided in an integrated structure with one of the two reducer shells 121, and in another embodiment, the motor shell 11 is provided in an integrated structure with the two reducer shells 121, without limitation, and those skilled in the art can make adjustments according to actual needs.

[0083] In one embodiment, the reducer 4 further comprises a first bearing 413, a second bearing 414, a third bearing 423, a fourth bearing 424, a fifth bearing 432, and a sixth bearing 433, wherein the first bearing 413 and the second bearing 414 are used to support the input shaft 41, the third bearing 423 and the fourth bearing 424 are used to support the intermediate shaft 42, and the fifth bearing 432 and the sixth bearing 433 are used to support the output shaft 43. In one embodiment, the first bearing 413, the second bearing 414, the third bearing 423, the fourth bearing 424, the fifth bearing 432, and the sixth bearing 433 are all ball bearings.

[0084] Further, the motor shell 11 comprises two side plates 112 spaced apart along the axial direction of the motor shaft 21, and the first bearing 413 and the second bearing 414 are spaced apart along the axial direction of the input shaft 41, wherein the inner ring of the first bearing 413 is fixedly connected to the outer wall of the input shaft 41, and the outer ring of the first bearing 413 is fixedly connected to the inner wall of the motor shaft 21; the inner ring of the second bearing 414 is fixedly connected to the outer wall of the input shaft 41, and the outer ring of the second bearing 414 is fixedly connected to the side plate 112. The recess is formed on the side of the primary reduction driven gear 421 close to the motor shell 11, and the third bearing 423 and the fourth bearing 424 are spaced apart along the axial direction of the intermediate shaft 42, wherein the inner ring of the third bearing 423 is fixedly connected to the motor shell 11, the outer ring of the third bearing 423 is fixedly connected to the groove wall of the recess, the inner ring of the fourth bearing 424 is fixedly connected to the outer wall of the intermediate shaft 42, and the outer ring of the fourth bearing 424 is fixedly connected to the reducer shell 121. The reducer shell 121 further comprises a bearing support plate 124 fixedly connected in the second accommodating cavity 123, and the fifth bearing 432 and the sixth bearing 433 are spaced apart along the axial direction of the output shaft 43, wherein the inner ring of the fifth bearing 432 is fixedly connected to the outer wall of the output shaft 43, the outer ring of the fifth bearing 432 is fixedly connected to the bearing support plate 124, the inner ring of the sixth bearing 433 is fixedly connected to the outer wall of the output shaft 43, and the outer ring of the sixth bearing 433 is fixedly connected to the reducer shell 121.

[0085] In some optional embodiments of the present application, as Figure 4As shown, the input shaft 41 is provided with an input shaft gear 411 at one end close to the differential 3; the differential 3 includes a planetary shaft 31 and a planetary gear 32, the planetary shaft 31 is fixedly connected to the motor shaft 21, and the planetary gear 32 is sleeved on the planetary shaft 31 and meshes with the input shaft gear 411. Specifically, the planetary shaft 31 is a cross shaft, and the cross shaft includes four shaft rods extending in the radial direction of the motor shaft 21 and perpendicular to each other; four planetary gears 32 are provided, and one planetary gear 32 is sleeved on one shaft rod.

[0086] In the embodiment of the present application, through the fixed connection of the planetary shaft 31 and the motor shaft 21, and the meshing of the planetary gear 32 and the input shaft gear 411, the torque generated by the motor 2 can be efficiently transmitted to the reducer. In addition, since four planetary gears 32 are provided, and the four planetary gears 32 are sleeved on the four shaft rods of the cross shaft, the power can be dispersed to the four planetary gears 32, so that the load borne by each planetary gear 32 is reduced, thereby reducing the vibration and noise caused by excessive load, and improving the transmission stability.

[0087] In some optional embodiments of the present application, the electric drive assembly further includes a housing 1 and a liquid suction pump 5 fixedly connected to the outside of the housing 1, and the housing 1 is used to accommodate the motor 2 and the reducer 4; the housing 1 is formed with a liquid storage area inside, and the liquid storage area is used to store the cooling and lubricating medium; the housing 1 is provided with a liquid inlet channel and a liquid outlet channel, the liquid inlet channel and the liquid outlet channel are respectively communicated with the liquid suction pump 5, one end of the liquid inlet channel away from the liquid suction pump 5 is communicated with the liquid storage area, and one end of the liquid outlet channel away from the liquid suction pump 5 extends to the motor 2 and / or the reducer 4, so as to realize the cooling and / or lubrication of the motor 2 and / or the reducer 4. Specifically, the housing 1 includes two reducer housings 121, i.e., a first reducer housing 1211 and a second reducer housing 1221, wherein the first liquid suction pump 51 is fixedly connected to the outside of the first reducer housing 1211, and the second liquid suction pump 52 is fixedly connected to the outside of the second reducer housing 1221.

[0088] In the embodiment of the present application, since the liquid suction pump 5 is provided, the liquid suction pump 5 can actively extract the cooling and lubricating medium from the liquid storage area and deliver it to the motor 2 and / or the reducer 4 through the liquid inlet channel and the liquid outlet channel, so as to sufficiently cool and / or lubricate the motor 2 and / or the reducer 4, effectively take away the heat and impurities generated by wear, and further significantly improve the cooling and lubrication effect of the motor 2 and the reducer 4, so as to improve the operation efficiency and reliability of the electric drive assembly and prolong the service life of the electric drive assembly. In addition, by fixing the liquid suction pump 5 on the outside of the housing 1, not only the installation and maintenance of the liquid suction pump 5 are facilitated, but also the interference of the liquid suction pump 5 with other components during operation can be avoided.

[0089] It should be noted that the cooling lubricating medium refers to a medium that can have lubrication and cooling effects, including but not limited to cooling oil. The liquid storage area refers to an area formed at the bottom of the shell 1, which can store the cooling lubricating medium, including the space at the bottom of the first containing cavity 111 and the second containing cavity 123. As known from the foregoing, the first containing cavity 111 and the second containing cavity 123 are independent of each other, and in order to make the cooling lubricating medium in the entire liquid storage area flow, the side plate 112 located between the first containing cavity 111 and the second containing cavity 123 is provided with a communication port, and the communication port is located below the liquid level of the liquid storage area.

[0090] In actual application, when the vehicle is in a tilted working condition, the liquid level of the cooling lubricating medium is tilted under the action of inertial force and gravity, and thus the phenomenon that the liquid suction pump 5 cannot participate in liquid supply due to air suction may occur. Based on this, in some optional embodiments of the present application, the speed reducer 4 includes a first speed reducer 44 and a second speed reducer 45, and the liquid suction pump 5 includes a first liquid suction pump 51 and a second liquid suction pump 52; the liquid inlet channel includes a first liquid inlet channel and a second liquid inlet channel, and the liquid outlet channel includes a first liquid outlet channel and a second liquid outlet channel, the first liquid inlet channel and the first liquid outlet channel are in communication with the first liquid suction pump 51 respectively, one end of the first liquid outlet channel away from the first liquid suction pump 51 extends to the motor 2 and the first speed reducer 44, the second liquid inlet channel and the second liquid outlet channel are in communication with the second liquid suction pump 52 respectively, and one end of the second liquid outlet channel away from the second liquid suction pump 52 extends to the motor 2 and the second speed reducer 45; wherein at least part of the first liquid outlet channel and the second liquid outlet channel are in communication.

[0091] In the embodiments of the present application, since the first liquid suction pump 51 and the second liquid suction pump 52 are provided, when the vehicle is in a horizontal posture and moves at a constant speed (i.e. in a normal working condition of the vehicle), the liquid level of the cooling lubricating medium remains horizontal, and the first liquid suction pump 51 and the second liquid suction pump 52 can both participate in liquid supply. Specifically, as shown in Figure 8 the first liquid suction pump 51 can actively draw the cooling lubricating medium from the liquid storage area and deliver it to the motor 2 and the first speed reducer 44 through the first liquid inlet channel and the first liquid outlet channel, thereby realizing cooling and lubrication of the motor 2 and the first speed reducer 44. The second liquid suction pump 52 can actively draw the cooling lubricating medium from the liquid storage area and deliver it to the motor 2 and the second speed reducer 45 through the second liquid inlet channel and the second liquid outlet channel, thereby realizing cooling and lubrication of the motor 2 and the second speed reducer 45.

[0092] In addition, since at least part of the first liquid outlet channel and the second liquid outlet channel are in communication, thus, as shown in Figure 9 and Figure 7As shown, when the second liquid suction pump 52 fails or is empty, the cooling and lubricating medium drawn from the liquid storage area by the first liquid suction pump 51 can flow through the first liquid inlet channel, the first liquid outlet channel and the second liquid outlet channel in turn, so that the cooling and lubrication of the motor 2, the first reducer 44 and the second reducer 45 can be realized. Similarly, when the first liquid suction pump 51 fails or is empty, the cooling and lubricating medium drawn from the liquid storage area by the second liquid suction pump 52 can flow through the second liquid inlet channel, the second liquid outlet channel and the first liquid outlet channel in turn, so that the cooling and lubrication of the motor 2, the second reducer 45 and the first reducer 44 can be realized. In summary, by connecting at least part of the first liquid outlet channel and the second liquid outlet channel, the cooling and lubrication reliability of the motor 2, the first reducer 44 and the second reducer 45 can be improved, which is beneficial to improve the working performance of the electric drive assembly.

[0093] Further, in order to enable the cooling and lubrication of the motor 2, the first reducer 44 and the second reducer 45 at all times when the vehicle is in a tilting working condition. In some optional embodiments of the present application, the first liquid inlet channel comprises a first liquid inlet 1211, and the first liquid inlet 1211 is in communication with the liquid storage area. The second liquid inlet channel comprises a second liquid inlet 1221, and the second liquid inlet 1221 is in communication with the liquid storage area; wherein the first liquid inlet 1211 and the second liquid inlet 1221 are centrally symmetrically arranged about the center point of the housing 1.

[0094] In the embodiments of the present application, since the first liquid inlet 1211 and the second liquid inlet 1221 are centrally symmetrically arranged about the center point of the housing 1, when the vehicle is in a tilting working condition, one liquid suction pump 5 can always participate in liquid supply, so that the cooling and lubrication reliability of the motor 2, the first reducer 44 and the second reducer 45 can be improved. Specifically, as shown in FIG. 6, when the vehicle is in a tilting working condition, one liquid suction pump 5 can always participate in liquid supply, so that the cooling and lubrication reliability of the motor 2, the first reducer 44 and the second reducer 45 can be improved. Figures 10-11 In the vehicle uphill and rapid acceleration working condition, or clockwise rapid cornering and slope left tilting, the second liquid suction pump 52 on the right side is empty, and the first liquid suction pump 51 on the left side participates in liquid supply; in the vehicle downhill and rapid deceleration working condition, or counterclockwise rapid cornering and slope right tilting, the first liquid suction pump 51 on the left side is empty, and the second liquid suction pump 52 on the right side participates in liquid supply, so that the reliable cooling and lubrication of the motor 2, the first reducer 44 and the second reducer 45 can be realized.

[0095] In one embodiment, the electric drive assembly is configured to be connected to a vehicle body having a front end and a rear end facing away from each other in a length direction of the vehicle body; the first liquid inlet 1211 is arranged close to the rear end, and the second liquid inlet 1221 is arranged close to the front end. Specifically, the reducer housing 121 includes a first reducer housing 1211 and a second reducer housing 1221, the first liquid inlet 1211 is arranged in the first reducer housing 1211 and close to the rear end of the vehicle body, and the second liquid inlet 1221 is arranged in the second reducer housing 1221 and close to the front end of the vehicle body. In addition, the first liquid inlet 1211 and the second liquid inlet 1221 can also be provided with filters for filtering the cooling lubricating medium to protect the first liquid pump 51 and the second liquid pump 52. Further, the first liquid inlet channel and the second liquid inlet channel, the first liquid outlet channel and the second liquid outlet channel, and the first liquid pump 51 and the second liquid pump 52 can also be arranged symmetrically about the center point of the housing 1, so as to simplify the structure of the first reducer housing 1211 and the second reducer housing 1221.

[0096] In some optional embodiments of the present application, the first liquid outlet channel includes a first main liquid channel, a first motor liquid channel and a first reducer liquid channel, the first main liquid channel includes two ends arranged facing away from each other, one end of which is in communication with the first liquid pump 51, and the other end is in communication with the first motor liquid channel and the first reducer liquid channel; the second liquid outlet channel includes a second main liquid channel, a second motor liquid channel and a second reducer liquid channel, the second main liquid channel includes two ends arranged facing away from each other, one end of which is in communication with the second liquid pump 52, and the other end is in communication with the second motor liquid channel and the second reducer liquid channel; wherein the first motor liquid channel and the second motor liquid channel are in communication. It can be understood that the first motor liquid channel and the second motor liquid channel together constitute a motor liquid channel for cooling the motor.

[0097] In the embodiment of the present application, the communication of the first motor liquid channel and the second motor liquid channel can realize the communication of the first liquid outlet channel and the second liquid outlet channel. In this way, when the second liquid suction pump 52 fails or is in a suction state, the cooling and lubricating medium drawn from the liquid storage area by the first liquid suction pump 51 can flow through the first liquid inlet channel, the first main liquid channel in sequence, and be branched to the first motor liquid channel and the first reducer liquid channel, so as to realize the cooling and lubrication of the motor 2 and the first reducer respectively. At the same time, the cooling and lubricating medium entering the first motor liquid channel can flow to the second motor liquid channel and the second reducer liquid channel communicated with the second motor liquid channel, so as to realize the cooling and lubrication of the second reducer. When the first liquid suction pump 51 fails or is in a suction state, the cooling and lubricating medium drawn from the liquid storage area by the second liquid suction pump 52 can flow through the second liquid inlet channel, the second main liquid channel in sequence, and be branched to the second motor liquid channel and the second reducer liquid channel, so as to realize the cooling and lubrication of the motor 2 and the second reducer respectively. At the same time, the cooling and lubricating medium entering the second motor liquid channel can flow to the first motor liquid channel and the first reducer liquid channel communicated with the first motor liquid channel, so as to realize the cooling and lubrication of the first reducer.

[0098] In some optional embodiments of the present application, the motor 2 further comprises: a rotor 22, a stator 23, and two liquid injection rings 24; the rotor 22 is sleeved on the motor shaft 21; the stator 23 is sleeved on the rotor 22 and fixedly connected with the housing 1, and the stator 23 is provided with a stator cooling channel 2311 extending in the axial direction thereof; the two liquid injection rings 24 are respectively arranged at the two axial ends of the stator 23, and one liquid injection ring 24 and the stator 23, the housing 1 form a cooling chamber; the two cooling chambers are communicated with the stator cooling channel 2311, and one of the two cooling chambers is communicated with the first motor liquid channel, and the other is communicated with the second motor liquid channel. Specifically, the motor shaft 21 is fixed on the rotor 22 by a key groove connection to realize the transmission of the torque of the motor 2.

[0099] In the embodiment of the present application, since the stator cooling channel 2311 is arranged, the communication of the two cooling chambers through the stator cooling channel 2311, and the communication of the two cooling chambers with the first motor liquid channel and the second motor liquid channel respectively, can realize the communication of the first motor liquid channel and the second motor liquid channel. In addition, when the cooling and lubricating medium flows through the stator cooling channel 2311, heat exchange with the stator 23 can be realized, so as to realize the cooling of the stator 23.

[0100] In specific applications, for example, Figure 5As shown, the stator 23 comprises a stator core 231 and a stator winding 232 arranged inside the stator core 231, and the stator cooling channel 2311 is arranged in the stator core 231, wherein at least part of the stator winding 232 protrudes from the axial end surface of the stator core 231. It should be noted that the stator cooling channel 2311 is usually arranged in multiple, and the multiple stator cooling channels 2311 are arranged in the circumferential direction of the stator core 231. In addition, as shown in the figure, the stator cooling channel 2311 is arranged in the circumferential direction of the stator core 231. Figure 6 As shown, the liquid injection ring 24 comprises a first annular connecting portion 241 and a second annular connecting portion 242 arranged in intersection, wherein one end of the first annular connecting portion 241 away from the second annular connecting portion 242 is sealingly connected with the axial end surface of the stator core 231, and one end of the second annular connecting portion 242 away from the first annular connecting portion 241 is sealingly connected with the motor housing 11, so as to form a closed cooling chamber together with the stator core 231 and the motor housing 11.

[0101] In some optional embodiments of the present application, the liquid injection ring 24 is provided with a liquid injection hole 2411, which communicates the cooling chamber and the liquid storage area. In this way, since the liquid injection hole 2411 is arranged, on the one hand, the communication between the cooling chamber and the liquid storage area can be realized, so that part of the cooling lubricating medium entering the cooling chamber returns to the liquid storage area, thereby realizing the circulation of the cooling lubricating medium. On the other hand, the cooling lubricating medium can be injected from the liquid injection hole 2411 to the stator winding 232, thereby realizing the cooling of the stator winding 232, and further improving the cooling effect of the stator 23.

[0102] Further, the liquid injection hole 2411 is arranged in multiple, and the multiple liquid injection holes 2411 are arranged in the circumferential direction of the first annular connecting portion 241. It should be noted that the number of the liquid injection hole 2411 is not limited in the embodiments of the present application, and can be adjusted according to actual needs by those skilled in the art.

[0103] In some optional embodiments of the present application, the first speed reducer 44 comprises a plurality of first lubricating members to be cooled, and the first speed reducer channel is provided with a plurality of first liquid outlets, one first liquid outlet corresponding to the position of one first lubricating member to be cooled; the second speed reducer 45 comprises a plurality of second lubricating members to be cooled, and the second speed reducer channel is provided with a plurality of second liquid outlets, one second liquid outlet corresponding to the position of one second lubricating member to be cooled. It can be understood that the first lubricating member to be cooled and the second lubricating member to be cooled both include but are not limited to the primary reduction driving gear 412, the primary reduction driven gear 421, the secondary reduction driving gear 422, the secondary reduction driven gear 431, the third bearing 423, the fourth bearing 424, the fifth bearing 432 and the sixth bearing 433.

[0104] In the embodiment of the present application, by arranging a plurality of first liquid outlets in the first reducer channel, and one first liquid outlet corresponding to the position of one first lubricated component to be cooled, and arranging a plurality of second liquid outlets in the second reducer channel, and one second liquid outlet corresponding to the position of one second lubricated component to be cooled, the point cooling and lubrication can be realized, which is beneficial to improve the cooling and lubrication effect of the first reducer 44 and the second reducer 45.

[0105] In some optional embodiments of the present application, the electric drive assembly further comprises: a one-way valve arranged at the outlet of the liquid suction pump 5 or in the liquid outlet channel, and the one-way valve is used to guide the one-way flow of the cooling lubricating medium. Specifically, the one-way valve comprises a first one-way valve and a second one-way valve, the first one-way valve is arranged in the first main liquid channel, and the second one-way valve is arranged in the second main liquid channel.

[0106] In the embodiment of the present application, since the first main liquid channel is provided with the first one-way valve, when the first liquid suction pump 51 fails or is empty suction, the cooling lubricating medium drawn out of the liquid storage area by the second liquid suction pump 52 can be prevented from entering the first liquid suction pump 51. Similarly, since the second main liquid channel is provided with the second one-way valve, when the second liquid suction pump 52 fails or is empty suction, the cooling lubricating medium drawn out of the liquid storage area by the first liquid suction pump 51 can be prevented from entering the second liquid suction pump 52. That is, by arranging the first one-way valve and the second one-way valve, it can be ensured that the motor 2, the first reducer 44 and the second reducer 45 can be fully cooled and lubricated when the vehicle is in a tilted working condition.

[0107] In actual application, the electric drive assembly further comprises a heat exchanger, the heat exchanger is provided with a heat exchange channel and a cooling water channel, and the heat exchange channel is connected in series with the liquid outlet channel, so as to reduce the temperature of the cooling lubricating medium, thereby improving the cooling effect of the motor 2, the first reducer 44 and the second reducer 45.

[0108] In summary, the electric drive assembly provided in the embodiment of the present application has at least the following advantages:

[0109] In the embodiment of the present application, by arranging the differential in the motor, and coaxially arranging the motor, the differential and the reducer, the compact arrangement of the components can be realized, so as to reduce the overall size of the electric drive assembly, which is beneficial to the miniaturization design of the electric drive assembly.

[0110] The embodiment of the present application further provides a vehicle comprising the electric drive assembly according to any one of the above embodiments.

[0111] It should be noted that in the embodiment of the present application, the structure of the electric drive assembly is the same as that of the assembly described in any one of the above embodiments, and the beneficial effects are similar, which will not be repeated here.

[0112] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means 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 application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0113] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An electric drive assembly, characterized in that, include: Motor, differential, and reducer; The differential is disposed inside the motor and connected to the motor; At least a portion of the reducer extends into the motor and is connected to the differential; The motor, the differential, and the reducer are arranged coaxially.

2. The electric drive assembly according to claim 1, characterized in that, The motor includes a hollow motor shaft; The differential is fixedly connected inside the motor shaft; The reducer includes an input shaft and an output shaft arranged coaxially, at least a portion of the input shaft extends into the motor shaft and is drivenly connected to the differential, and the output shaft is used for drively connecting to the wheel end.

3. The electric drive assembly according to claim 2, characterized in that, Two reducers are provided, and the two reducers are symmetrically arranged at both ends of the motor shaft.

4. The electric drive assembly according to claim 2, characterized in that, The reducer is a multi-stage coaxial reducer.

5. The electric drive assembly according to claim 4, characterized in that, The multi-stage coaxial reducer is a two-stage coaxial reducer.

6. The electric drive assembly according to claim 5, characterized in that, The two-stage coaxial reducer also includes an intermediate shaft, which is arranged parallel to the input shaft. The intermediate shaft is provided with a first-stage reduction driven gear and a second-stage reduction driving gear. The input shaft is equipped with a first-stage reduction drive gear, which meshes with the first-stage reduction driven gear. The output shaft is equipped with a two-stage reduction driven gear, which meshes with the two-stage reduction driving gear.

7. The electric drive assembly according to any one of claims 2-6, characterized in that, An input shaft gear is provided at the end of the input shaft near the differential; The differential includes a planetary shaft and planetary gears. The planetary shaft is fixedly connected to the motor shaft, and the planetary gears are sleeved on the planetary shaft and mesh with the input shaft gear.

8. The electric drive assembly according to claim 7, characterized in that, The planetary axis is a cross axis, which includes four shafts that extend radially along the motor shaft and are perpendicular to each other. The planetary gears are provided in four parts, with each planetary gear being fitted onto one of the shafts.

9. The electric drive assembly according to any one of claims 2-6, characterized in that, The electric drive assembly also includes a housing and a liquid suction pump fixedly connected to the outside of the housing, the housing being used to house the motor and the reducer; A liquid storage area is formed inside the housing, and the liquid storage area is used to store cooling and lubricating media; The housing is provided with a liquid inlet channel and a liquid outlet channel. The liquid inlet channel and the liquid outlet channel are respectively connected to the liquid suction pump. The end of the liquid inlet channel away from the liquid suction pump is connected to the liquid storage area. The end of the liquid outlet channel away from the liquid suction pump extends to the motor and / or the reducer to achieve cooling and / or lubrication of the motor and / or the reducer.

10. The electric drive assembly according to claim 9, characterized in that, The reducer includes a first reducer and a second reducer, and the liquid suction pump includes a first liquid suction pump and a second liquid suction pump; The liquid inlet channel includes a first liquid inlet channel and a second liquid inlet channel, and the liquid outlet channel includes a first liquid outlet channel and a second liquid outlet channel. The first liquid inlet channel and the first liquid outlet channel are respectively connected to the first liquid suction pump. The end of the first liquid outlet channel away from the first liquid suction pump extends to the motor and the first reducer. The second liquid inlet channel and the second liquid outlet channel are respectively connected to the second liquid suction pump. The end of the second liquid outlet channel away from the second liquid suction pump extends to the motor and the second reducer. The first liquid outlet channel and the second liquid outlet channel are at least partially connected.

11. The electric drive assembly according to claim 10, characterized in that, The first liquid inlet channel includes a first liquid inlet, which is connected to the liquid storage area; the second liquid inlet channel includes a second liquid inlet, which is connected to the liquid storage area. The first liquid inlet and the second liquid inlet are symmetrically arranged about the center point of the housing.

12. The electric drive assembly according to claim 11, characterized in that, The electric drive assembly is used to connect to the vehicle body, which has a front end and a rear end that are opposite to each other in its length direction; The first liquid inlet is located near the rear end, and the second liquid inlet is located near the front end.

13. The electric drive assembly according to any one of claims 10-12, characterized in that, The first liquid outlet channel includes a first main liquid channel, a first motor liquid channel, and a first reducer liquid channel. The first main liquid channel includes two ends that are arranged opposite to each other, one end of which is connected to the first suction pump, and the other end is connected to the first motor liquid channel and the first reducer liquid channel. The second liquid outlet channel includes a second main liquid channel, a second motor liquid channel, and a second reducer liquid channel. The second main liquid channel includes two ends that are arranged opposite to each other, one end of which is connected to the second suction pump, and the other end is connected to the second motor liquid channel and the second reducer liquid channel. The first motor fluid passage is connected to the second motor fluid passage.

14. The electric drive assembly according to claim 13, characterized in that, The motor also includes: a rotor, a stator, and two liquid injection rings; The rotor is sleeved on the motor shaft; The stator is sleeved on the rotor and fixedly connected to the housing, and the stator is provided with a stator cooling channel extending along its axial direction; The two spray rings are respectively disposed at both ends of the stator axial direction, and one of the spray rings, the stator, and the housing form a cooling chamber; Both cooling chambers are connected to the stator cooling channel, and one of the two cooling chambers is connected to the first motor fluid channel, while the other is connected to the second motor fluid channel.

15. The electric drive assembly according to claim 14, characterized in that, The spray ring is provided with spray holes, which connect the cooling chamber and the liquid storage area.

16. The electric drive assembly according to claim 13, characterized in that, The first reducer includes a plurality of first lubricated components to be cooled, and the first reducer channel is provided with a plurality of first liquid outlets, with one first liquid outlet corresponding to one position of the first lubricated component to be cooled; The second reducer includes multiple second lubricated components to be cooled, and the second reducer channel is provided with multiple second liquid outlets, with one second liquid outlet corresponding to one of the second lubricated components to be cooled.

17. The electric drive assembly according to claim 9, characterized in that, The electric drive assembly further includes a one-way valve, which is disposed at the outlet of the suction pump or in the liquid outlet channel, and is used to guide the cooling and lubricating medium to flow in one direction.

18. The electric drive assembly according to claim 9, characterized in that, The housing includes: a motor housing and two reducer housings, the two reducer housings being disposed opposite to each other, and the motor housing being disposed between the two reducer housings; The motor housing is provided with a first receiving cavity, which is used to receive the motor. A reducer housing and a motor housing together form a second receiving cavity, the second receiving cavity being used to receive one of the reducers.

19. The electric drive assembly according to claim 18, characterized in that, The motor housing and at least one of the reducer housings are integrated into a single structure.

20. A vehicle, characterized in that, Includes the electric drive assembly as described in any one of claims 1-19.

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