Electric drive axle and power system

Abstract

The utility model discloses an electric drive axle and a power system, and relates to the field of vehicles. The electric drive axle comprises a reduction gearbox shell, an electric drive assembly and a transmission assembly, wherein the reduction gearbox shell is provided with an input port and two opposite output ports; the centralized transmission shaft assembly and the distributed transmission shaft assembly are installed in the reduction gearbox shell in an interchangeable mode; provided is a centralized transmission shaft assembly package. When the centralized transmission shaft assembly is installed in the reduction gearbox shell, the first input gear directly faces the input port, and the first left half output gear and the first right half output gear directly face the two output ports respectively. When the distributed transmission shaft assembly is installed in the reduction gearbox shell, the second left half input gear and the second right half input gear directly face the input port, and the second left half output gear and the second right half output gear directly face the two output ports respectively. The positions of the input gears and the output gears of the two transmission shaft assembly structures of the electric drive axle are the same, and centralized transmission and distributed transmission can be flexibly adapted by changing the middle structure.

Description

Technical Field

[0001] The utility model relates to the field of vehicles, in particular to an electric drive axle and a power system. Background Art

[0002] For the electric drive axles disclosed in the prior art, the structural layout is fixed, and the applicable vehicle models are limited. Even if there are technical solutions for the layout of the main reduction gear mechanism of the distributed electric drive axle and the layout of the main reduction gear of the centralized electric drive axle disclosed in individual patents, each has its drawbacks. For example, in some distributed electric drive axle systems, the structure is complex and occupies too much space, resulting in an unreasonable spatial distribution of the entire axle. Or the differential of some electric drive axle transmission systems cannot be arranged at the center of the system, resulting in uneven mass distribution on the left and right sides of the entire axle. Content of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides an electric drive axle and a power system, which can be made universal on centralized drive shafts and distributed drive shafts through reasonable layout, have a wide range of applicable vehicle models, and have a relatively simple overall structure and are easy to arrange the center.

[0004] The electric drive axle according to the first aspect embodiment of the utility model includes: a reduction gearbox housing having an input port and two opposite output ports; a centralized drive shaft assembly and a distributed drive shaft assembly, the centralized drive shaft assembly and the distributed drive shaft assembly being interchangeably installed in the reduction gearbox housing; the centralized drive shaft assembly includes: a bridge housing, a first input gear, a differential, a first left half output gear, and a first right half output gear, the first input gear being fixedly connected to the bridge housing, the differential being installed in the bridge housing, the first left half output gear and the first right half output gear being coaxially arranged, and the first left half output gear and the first right half output gear being respectively connected to the differential through a first output shaft; the distributed drive shaft assembly includes: a second left half input gear, a second right half input gear, a second left half output gear, and a second right half output gear, the second left half input gear and the second right half input gear being coaxially and rotatably connected, the second left half output gear being fixedly connected to the second left half input gear through a second output shaft, and the second right half output gear being fixedly connected to the second right half input gear through another second output shaft; wherein, when the centralized drive shaft assembly is installed in the reduction gearbox housing, the first input gear faces the input port, and the first left half output gear and the first right half output gear respectively face the two output ports; when the distributed drive shaft assembly is installed in the reduction gearbox housing, the second left half input gear and the second right half input gear face the input port, and the second left half output gear and the second right half output gear respectively face the two output ports.

[0005] For the input gear and output gear of the two drive shaft assemblies of the electric drive axle according to the embodiments of the present utility model, their positions are the same. By changing the intermediate structure, it can be flexibly adapted to centralized drive and distributed drive, and other drive structures in the reduction gearbox can also be unchanged. The two drive shaft assemblies described in this patent are structurally compact, efficiently utilize the internal space of the reduction gearbox housing, reduce the volume of the reduction gearbox housing, and leave more space for arranging other structures of the whole vehicle.

[0006] In some embodiments, the electric drive axle satisfies at least one of the following conditions:

[0007] Condition 1: The module and pitch diameter of the first input gear, the second left half input gear, and the second right half input gear are equal;

[0008] Condition 2: The module and pitch diameter of the first left half output gear and the second left half output gear are equal;

[0009] Condition 3: The module and pitch diameter of the first right half output gear and the second right half output gear are equal;

[0010] Condition 4: The end face distance between the first left half output gear and the first right half output gear away from each other is L1, and the end face distance between the second left half output gear and the second right half output gear away from each other is L2, and L1 = L2.

[0011] In some embodiments, the centralized drive shaft assembly further includes: two first support bearings, and the two first support bearings are respectively sleeved outside the two first output shafts;

[0012] The distributed drive shaft assembly further includes: two second support bearings, and the two second support bearings are respectively sleeved outside the two second output shafts;

[0013] The positions of the two first support bearings and the two second support bearings are the same.

[0014] Specifically, the centralized drive shaft assembly further includes: a bearing seat, the bearing seat is sleeved outside the first output shaft connected to the first left half output gear, one of the first support bearings is sleeved on the bearing seat, and the other first support bearing is sleeved on the axle housing outside the other first output shaft.

[0015] Further, in the distributed drive shaft assembly, one of the second output shafts is integrally formed with the second left half output gear, and the other second output shaft is integrally formed with the second right half output gear;

[0016] The inner rings of the two second support bearings are respectively sleeved and fixed on the two second output shafts.

[0017] In some embodiments, the distributed transmission shaft assembly further includes: a socket inner shaft coaxially and fixedly connected to one end of a second output shaft; a socket shaft sleeve coaxially and fixedly connected to one end of the other second output shaft, the socket shaft sleeve being sleeved outside the socket inner shaft; a socket bearing located between the socket inner shaft and the socket shaft sleeve; wherein, the second left half input gear is fixedly connected to the socket shaft sleeve, and the second right half input gear is fixedly connected to the socket inner shaft.

[0018] Specifically, the second left half input gear is integrally formed with the socket shaft sleeve; a flange is formed at the end of the corresponding second output shaft, and the flange is connected to the second left half input gear through fasteners.

[0019] Specifically, the socket inner shaft is provided with an external thread at one end away from the second output shaft to which it is connected; the distributed transmission shaft assembly further includes: a locking nut screwed onto the external thread of the socket inner shaft, and the locking nut is used to compress the socket bearing.

[0020] Optionally, the socket inner shaft, the connected second output shaft and the second right half output gear are integrally formed.

[0021] The power system according to the second aspect embodiment of the present invention includes: an electric drive axle according to the above embodiment; a left half input motor and a right half input motor. When the centralized transmission shaft assembly is installed in the reduction gearbox housing, the output ends of the left half input motor and the right half input motor are both in meshing transmission with the first input gear. When the distributed transmission shaft assembly is installed in the reduction gearbox housing, the output end of the left half input motor is in meshing transmission with the second left half input gear, and the output end of the right half input motor is in meshing transmission with the second right half input gear.

[0022] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0023] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0024] Figure 1 is a schematic structural layout diagram of the power system according to the embodiment of the present invention;

[0025] Figure 2Internal structure diagram of an electric drive axle in some embodiments when installing a centralized drive shaft assembly;

[0026] Figure 3 Internal structure diagram of an electric drive axle in some embodiments when installing a distributed drive shaft assembly;

[0027] Figure 4A Schematic structural diagram of an electric drive axle in a power system in some embodiments when installing a centralized drive shaft assembly;

[0028] Figure 4B is Figure 4A Schematic structural diagram of the electric drive axle in the power system shown when installing a distributed drive shaft assembly;

[0029] Figure 5A Schematic structural diagram of an electric drive axle in a power system in some other embodiments when installing a centralized drive shaft assembly;

[0030] Figure 5B is Figure 5A Schematic structural diagram of the electric drive axle in the power system shown when installing a distributed drive shaft assembly.

[0031] Reference numerals:

[0032] Power system 1000,

[0033] Electric drive axle 100,

[0034] Reducer housing 1, input port 11, output port 12,

[0035] Centralized drive shaft assembly 2, axle housing 21, left half housing 211, right half housing 212, first input gear 22, first left half output gear 23, first right half output gear 24, differential 25, first retaining ring 261, first bearing 262, second retaining ring 263, third retaining ring 264, second bearing 265, first bolt 266, fourth retaining ring 267, third bearing 268, fifth retaining ring 269, first output shaft 27, first support bearing 281, bearing seat 282, differential sliding sleeve 283, fifth retaining ring 284, fourth bearing 285, first snap ring 286, second snap ring 287,

[0036] Distributed drive shaft assembly 3, second left half input gear 31, second right half input gear 32, second left half output gear 33, second right half output gear 34, second output shaft 37, flange 373, fastener 374, shaft neck ring 375, socket inner shaft 351, socket shaft sleeve 352, socket bearing 353, external thread 35-1, lock nut 354, bearing retaining ring 355, first washer 356, second washer 357, elastic washer 358, second support bearing 381,

[0037] Half shaft 400, left half shaft 410, right half shaft 420,

[0038] Left half input motor 800, right half input motor 900. Detailed implementation mode

[0039] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying 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 with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0040] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 therefore should not be construed as a limitation of the present utility model. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "plurality" is two or more.

[0041] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0042] As is well known to those skilled in the art, the electric drive axle is an important part of the vehicle power system and is located at the end of the power system. The power source of the power system transmits power to the electric drive axle. After the speed of the electric drive axle is reduced and the torque is increased, the power will be distributed to the half shafts on both sides, and the power will be transmitted to the wheels on both sides by the half shafts on both sides respectively. The wheels on both sides rotate simultaneously to drive the vehicle to move forward.

[0043] When the vehicle turns, according to the speed difference requirements of the wheels on both sides, the proportion of the power distributed to the half shafts on both sides by the electric drive axle will be adjusted adaptively, so that the speed of the inner wheel is lower than that of the outer wheel to ensure that the vehicle can turn smoothly.

[0044] In the vehicle solutions disclosed in the prior art, the structural layout of the electric drive axle is fixed, and a single reduction gearbox housing is only suitable for one type of electric drive axle structure. When changing the electric drive axle structure according to the design changes of the power source structure, not only is the assembly difficult, but there will also be a lot of wasted space inside the reduction gearbox housing. In view of the two structural forms of the power source, the present application proposes an electric drive axle that can adapt to centralized and distributed drive shaft solutions, keeping the relative positions of the input gear and the output gear fixed. By changing the intermediate structure, the entire output shaft can be either a centralized drive solution or a distributed drive solution, and the centralized and distributed solutions can be interchanged. At this time, since the shapes, input positions, and output positions of the centralized drive solution and the distributed drive solution are generally the same, the reduction gearbox housing can be adaptively designed according to the shape, input position, and output position of the drive solution. The resulting reduction gearbox housing will not have excessive wasted space not only in the centralized solution but also in the distributed solution, thereby reducing space waste and waste of housing materials and improving the utilization rate of the internal space of the reduction gearbox housing.

[0045] The following describes the electric drive axle 100 and the power system 1000 according to embodiments of the present invention with reference to the accompanying drawings.

[0046] Refer to Figure 1 , the electric drive axle 100 according to an embodiment of the present invention includes: a reduction gearbox housing 1, the reduction gearbox housing 1 having an input port 11 and two opposite output ports 12. The input port 11 corresponds to the above-mentioned input position, and the output port 12 corresponds to the above-mentioned output position. The electric drive axle 100 connects two half shafts 400 at two output positions. For the convenience of description, the two half shafts 400 are respectively referred to as the left half shaft 410 and the right half shaft 420. The left half shaft 410 and the right half shaft 420 are used to connect the left and right wheels of the vehicle.

[0047] The reduction gearbox housing 1 provides a stable installation position and support structure for the internal drive shaft assembly, bears the axial force, radial force generated during transmission, and the acting force applied by the external load, provides a protection space for the internal drive shaft assembly, and also facilitates the provision of a lubrication space for the drive shaft assembly.

[0048] The electric drive axle 100 further includes a centralized drive shaft assembly 2 and a distributed drive shaft assembly 3, and the centralized drive shaft assembly 2 and the distributed drive shaft assembly 3 are interchangeably installed in the reduction gearbox housing 1.

[0049] Refer to Figure 2, the centralized drive shaft assembly 2 includes: a bridge housing 21, a first input gear 22, a differential 25, a first left half-output gear 23, and a first right half-output gear 24. The first input gear 22 is fixedly connected to the bridge housing 21, the differential 25 is installed inside the bridge housing 21, the first left half-output gear 23 and the first right half-output gear 24 are coaxially arranged, and the first left half-output gear 23 and the first right half-output gear 24 are respectively connected to the differential 25 through a first output shaft 27.

[0050] When the centralized drive shaft assembly 2 is installed inside the reduction gear housing 1, the first input gear 22 faces the input port 11, and the first left half-output gear 23 and the first right half-output gear 24 respectively face the two output ports 12.

[0051] That is to say, the power source transmits power to the first input gear 22, which transmits the power to the bridge housing 21, and then the bridge housing 21 distributes the power to the first left half-output gear 23 and the first right half-output gear 24 through the differential 25. Among them, the first left half-output gear 23 is connected to the left half shaft 410 at the output position to connect the left wheel of the vehicle. The first right half-output gear 24 is connected to the right half shaft 420 at the output position to connect the right wheel of the vehicle.

[0052] The differential of the left and right wheels of the centralized drive shaft assembly 2 is a passive differential. When the vehicle is driving straight, the differential 25 has no differential effect, and the bridge housing 21 rotates at the same speed as the first left half-output gear 23 and the first right half-output gear 24, causing the left and right wheels to rotate at the same speed. When the vehicle is turning, the frictional forces on the left and right wheels from the ground are not equal, and the torques fed back to the first left half-output gear 23 and the first right half-output gear 24 are not equal. The differential 25 exerts a differential effect, and the bridge housing 21 and the first left half-output gear 23 and the first right half-output gear 24 all rotate differentially.

[0053] Refer to again Figure 3 , the distributed drive shaft assembly 3 includes: a second left half-input gear 31, a second right half-input gear 32, a second left half-output gear 33, and a second right half-output gear 34. The second left half-input gear 31 and the second right half-input gear 32 are coaxially and rotatably connected. The second left half-output gear 33 is fixedly connected to the second left half-input gear 31 through a second output shaft 37, and the second right half-output gear 34 is fixedly connected to the second right half-input gear 32 through another second output shaft 37.

[0054] When the distributed drive shaft assembly 3 is installed inside the reduction gear housing 1, the second left half-input gear 31 and the second right half-input gear 32 face the input port 11, and the second left half-output gear 33 and the second right half-output gear 34 respectively face the two output ports 12.

[0055] That is to say, there are two power sources. One power source is connected to the second left half input gear 31, transmits power to the second left half input gear 31, and is transmitted by the second left half input gear 31 to the second left half output gear 33. The second left half output gear 33 is connected to the left half shaft 410 at the output position to connect the left wheel of the vehicle. The other power source is connected to the second right half input gear 32, transmits power to the second right half input gear 32, and is transmitted by the second right half input gear 32 to the second right half output gear 34. The second right half output gear 34 is connected to the right half shaft 420 at the output position to connect the right wheel of the vehicle.

[0056] The differential of the left and right wheels of the centralized drive shaft assembly 2 is an active differential. When the rotational speeds input by the two power sources are equal, the rotational speeds output to the left and right wheels are finally equal, enabling the vehicle to drive straight. When the rotational speeds input by the two power sources are not equal, the rotational speeds output to the left and right wheels are finally not equal, enabling the vehicle to turn.

[0057] According to the embodiments of the present invention, the positions of the input gears and output gears of the two drive shaft assembly structures of the electric drive axle 100 are the same. By changing the intermediate structure, it can be flexibly adapted to centralized drive and distributed drive, and other drive structures in the reduction gearbox can also be unchanged. The two drive shaft assembly structures described in this patent are compact, efficiently utilize the internal space of the reduction gearbox housing 1, reduce the volume of the reduction gearbox housing 1, and leave more space for arranging other structures of the whole vehicle.

[0058] In some embodiments, the module and pitch diameter of the first input gear 22, the second left half input gear 31, and the second right half input gear 32 are equal. In this way, when the power source cooperates with the two drive shaft assemblies, the output gear of the same power source can be connected to the first input gear 22, or to the second left half input gear 31 and the second right half input gear 32. That is to say, when the drive shaft assembly is replaced, the power source does not need to replace the output gear, improving the adaptability and reducing the replacement cost of the drive shaft assembly.

[0059] In some embodiments, the module and pitch diameter of the first left half output gear 23 and the second left half output gear 33 are equal. In this way, when the drive shaft assembly is replaced, the input gear of the left half shaft 410 does not need to be replaced and can directly mesh with the first left half output gear 23 of the centralized drive shaft assembly 2 or directly mesh with the second left half output gear 33 of the distributed drive shaft assembly 3.

[0060] In some embodiments, the module and pitch diameter of the first right half output gear 24 and the second right half output gear 34 are equal. In this way, when the drive shaft assembly is replaced, the input gear of the right half shaft 420 does not need to be replaced and can directly mesh with the first right half output gear 24 of the centralized drive shaft assembly 2 or directly mesh with the second right half output gear 34 of the distributed drive shaft assembly 3.

[0061] In some embodiments, the end face distance between the first left half output gear 23 and the first right half output gear 24 away from each other is L1, and the end face distance between the second left half output gear 33 and the second right half output gear 34 away from each other is L2, and L1 = L2. With such a setting, it is ensured that the output positions of the first left half output gear 23 and the second left half output gear 33 on the reduction gearbox housing 1 are fixed, and the output positions of the first right half output gear 24 and the second right half output gear 34 on the reduction gearbox housing 1 are fixed.

[0062] In some embodiments, referring to Figure 2 , the centralized transmission shaft assembly 2 further includes: two first support bearings 281, and the two first support bearings 281 are respectively sleeved on the outer sides of the two first output shafts 27. The two first support bearings 281 are arranged on the reduction gearbox housing 1 to support the two first output shafts 27 and reduce the cantilever distance of the two first output shafts 27.

[0063] Referring to Figure 3 , the distributed transmission shaft assembly 3 further includes: two second support bearings 381, and the two second support bearings 381 are respectively sleeved on the outer sides of the two second output shafts 37. The two second support bearings 381 are arranged on the reduction gearbox housing 1 to support the two second output shafts 37 and reduce the cantilever distance of the two second output shafts 37.

[0064] Specifically, the positions of the two first support bearings 281 and the two second support bearings 381 on the reduction gearbox housing 1 are the same. In this way, when replacing the transmission shaft assembly, it is not necessary to change the position of the support bearings, and the reduction gearbox housing 1 only needs to set a pair of support bearing positions to adapt to the two transmission shaft assembly solutions.

[0065] Referring to Figure 2 , the centralized transmission shaft assembly 2 further includes: a bearing seat 282, the bearing seat 282 is sleeved on the outside of the first output shaft 27 connected to the first left half output gear 23, one first support bearing 281 is sleeved on the bearing seat 282, and the other first support bearing 281 is sleeved on the axle housing 21 outside the other first output shaft 27. The bearing seat 282 is provided here to make up the diameter of the first output shaft 27 connected to the first left half output gear 23, so that the two first support bearings 281 on the left and right can select the same bearing.

[0066] Optionally, the type of the first support bearing 281 is not limited, and it can be a tapered roller bearing or a deep groove ball bearing.

[0067] Referring to Figure 3, the second output shaft 37 connected to the second left half output gear 33 has a journal collar 375 integrally formed on its outer periphery for assembling the second support bearing 381. In this way, the journal collar 375 can supplement the diameter of the second output shaft 37 connected to the second left half output gear 33, so that the two second support bearings 381 on the left and right can select the same bearing.

[0068] Furthermore, the first support bearing 281 and the second support bearing 381 have the same size.

[0069] It should be noted that the quantity, model, and position of the first support bearing 281 can be flexibly changed, and the quantity, model, and position of the second support bearing 381 can be flexibly changed.

[0070] In some embodiments, referring to Figure 3 , in the distributed transmission shaft assembly 3, one second output shaft 37 is integrally formed with the second left half output gear 33, and the other second output shaft 37 is integrally formed with the second right half output gear 34. The inner rings of the two second support bearings 381 are respectively sleeved and fixed on the two second output shafts 37. Such a setting can improve the overall structural strength, bending resistance, and the compactness of the part structure.

[0071] In some embodiments, referring to Figure 3 , the distributed transmission shaft assembly 3 further includes: a socket inner shaft 351, a socket shaft sleeve 352, and a socket bearing 353. The socket inner shaft 351 is coaxially and fixedly connected to one end of a second output shaft 37, the socket shaft sleeve 352 is coaxially and fixedly connected to the other end of the second output shaft 37, the socket shaft sleeve 352 is sleeved outside the socket inner shaft 351, and the socket bearing 353 is located between the socket inner shaft 351 and the socket shaft sleeve 352.

[0072] Among them, the second left half input gear 31 is fixedly connected to the socket shaft sleeve 352, and the second right half input gear 32 is fixedly connected to the socket inner shaft 351.

[0073] Such a setting enables the second left half input gear 31 and the second right half input gear 32 to be coaxially and closely arranged, and there is no need for a large gap between them. In this way, when connected to the output gear of the power source, they can be compactly arranged. Moreover, with such a setting, the input port 11 on the reduction gearbox housing 1 can be set smaller, which is convenient for protection.

[0074] Specifically, the second left half input gear 31 is integrally formed with the socket shaft sleeve 352. The corresponding second output shaft 37 forms a flange 373 at the end, and the flange 373 is connected to the second left half input gear 31 through a fastener 374. With such a setting, the connection reliability and the compactness of the part layout are improved.

[0075] Optionally, the socket inner shaft 351 is provided with an external thread 35-1 at one end away from the connected second output shaft 37. The distributed transmission shaft assembly 3 further includes a lock nut 354 screwed onto the external thread 35-1 of the socket inner shaft 351, and the lock nut 354 is used to press the socket bearing 353. With such a setting, the radial dimension occupied by the connection part is smaller, which helps to control the overall dimension and reduce the space occupied by the reduction gearbox housing 1.

[0076] Furthermore, the socket inner shaft 351, the connected second output shaft 37 and the second right half output gear 34 are integrally formed, which can improve the structural integration degree.

[0077] Next, refer to Figure 2 to describe the structure and assembly process of the centralized transmission shaft assembly 2 shown in the figure.

[0078] In the centralized transmission shaft assembly 2, the axle housing 21 is divided into a left half housing 211 and a right half housing 212, and a differential 25 is installed inside them. In some solutions, the axle housing 21 can also be regarded as a part of the differential 25.

[0079] The differential sliding sleeve 283 is installed in the left half housing 211 of the differential 25, the left first output shaft 27 and the differential 25 are connected by splines, and the right first output shaft 27 and the differential 25 are connected by splines.

[0080] Among them, inside the right half housing 212, a first retaining ring 261, a first bearing 262, and a second retaining ring 263 are stacked and connected between the right half housing 212 and the right first output shaft 27. The first bearing 262 is a flat thrust bearing. Outside the right half housing 212, a third retaining ring 264 and a second bearing 265 are stacked and connected between the right half housing 212 and the right first output shaft 27. The second bearing 265 is a flat thrust bearing.

[0081] The left half housing 211 and the right half housing 212 are rigidly connected by a first bolt 266, and a first support bearing 281 is rigidly connected to the right half housing 212. On the left first output shaft 27, a fourth retaining ring 267, a third bearing 268, and a fifth retaining ring 269 are sequentially sleeved. The third bearing 268 is a flat thrust bearing. Then, a bearing seat 282 is sleeved on the left first output shaft 27, and the bearing seat 282 is rigidly connected to the left half housing 211. The first support bearing 281 and the bearing seat 282 are rigidly connected.

[0082] On the left first output shaft 27, a fifth retaining ring 284 and a fourth bearing 285 are further sleeved. The first left half output gear 23 and the left first output shaft 27 are connected by splines, and a first snap ring 286 is installed in the left first output shaft 27. The first right half output gear 24 and the right first output shaft 27 are connected by splines, and a second snap ring 287 is installed in the right first output shaft 27.

[0083] Refer to the following Figure 3 to describe the structure and assembly process of the distributed drive shaft assembly 3 shown in the figure.

[0084] In the distributed drive shaft, the second right half input gear 32 is integrally formed with the socket inner shaft 351, a second output shaft 37, and the second right half output gear 34. Another second output shaft 37 and the second left half output gear 33 are integrally formed. The second left half input gear 31 is integrally formed with the socket sleeve 352.

[0085] The socket bearing 353 is sleeved on the socket inner shaft 351, so as to be rigidly connected to the second right half input gear 32. The socket sleeve 352 is sleeved on the socket bearing 353, and the socket bearing 353 is rigidly connected to the second left half output gear 33. The socket bearing 353 is a tapered roller bearing. There are two spaced socket bearings 353, and they are spaced by a bearing retaining ring 355. The socket bearing 353 is installed on the socket inner shaft 351.

[0086] The first washer 356 and the second washer 357 are sequentially inserted into the socket inner shaft 351 from left to right. The second washer 357 is a brake washer. The lock nut 354 is rigidly connected to the socket inner shaft 351 and presses the second washer 357. The second output shaft 37 on the left is connected to the second left half input gear 31 by a fastener 374 through a flange 373, and an elastic washer 358 is provided at the connection. The second support bearing 381 on the left is rigidly connected to a journal ring 375 on the second output shaft 37 on the left, and the second support bearing 381 on the right is rigidly connected to the second right half input gear 32.

[0087] According to the power system 1000 of the embodiment of the present invention, as Figure 1 shown, it includes: the electric drive axle 100 of the above embodiment; and a left half input motor 800 and a right half input motor 900.

[0088] Figure 4A And Figure 4B For a power system 10000, other structures remain unchanged, only the drive shaft assembly is replaced. Figure 5A And Figure 5B For a power system 10000, other structures remain unchanged, only the drive shaft assembly is replaced.

[0089] When the centralized drive shaft assembly 2 is installed in the reduction gearbox housing 1, the output ends of the left half input motor 800 and the right half input motor 900 are both in meshing transmission with the first input gear 22. When the distributed drive shaft assembly 3 is installed in the reduction gearbox housing 1, the output end of the left half input motor 800 is in meshing transmission with the second left half input gear 31, and the output end of the right half input motor 900 is in meshing transmission with the second right half input gear 32. With such a setting, the power system 1000 can flexibly select the drive shaft solution according to different vehicle requirements.

[0090] Other components of the power system 1000 according to the embodiments of the present invention, such as the structure and working principle of motors and the like, are known to those of ordinary skill in the art and will not be described in detail here.

[0091] In the description of this specification, the description with reference to terms such as "embodiment", "example", etc. 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 invention. In this specification, the schematic representations 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.

[0092] 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. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electric drive bridge, characterized in that: include: A reduction gearbox housing, wherein the reduction gearbox housing has an input port and two opposite output ports; A centralized transmission shaft assembly and a distributed transmission shaft assembly, wherein the centralized transmission shaft assembly and the distributed transmission shaft assembly are interchangeably mounted in the reduction gearbox housing; The centralized transmission shaft assembly comprises: an axle housing, a first input gear, a differential, a first left-half output gear, and a first right-half output gear, wherein the first input gear is fixedly connected to the axle housing, the differential is installed in the axle housing, the first left-half output gear and the first right-half output gear are coaxially arranged, and the first left-half output gear and the first right-half output gear are respectively connected to the differential through a first output shaft; The distributed transmission shaft assembly comprises: a second left-half input gear, a second right-half input gear, a second left-half output gear, and a second right-half output gear, wherein the second left-half input gear and the second right-half input gear are coaxial and rotationally connected, the second left-half output gear is fixedly connected to the second left-half input gear via a second output shaft, and the second right-half output gear is fixedly connected to the second right-half input gear via another second output shaft; Wherein, when the centralized transmission shaft assembly is installed in the reduction box housing, the first input gear faces the input port, and the first left-half output gear and the first right-half output gear face the two output ports respectively; When the distributed transmission shaft assembly is installed in the reduction gear housing, the second left-half input gear and the second right-half input gear face the input port, and the second left-half output gear and the second right-half output gear face the two output ports respectively.

2. The electric drive axle according to claim 1, characterized in that: At least one of the following conditions is met: Condition 1: the first input gear, the second left half input gear and the second right half input gear have the same module and the same pitch circle diameter; Condition 2: The first left half output gear and the second left half output gear have the same module and the same pitch circle diameter; Condition 3: The first right half output gear and the second right half output gear have the same module and the same pitch circle diameter; Condition 4: The end face distance between the first left half output gear and the first right half output gear is L1, the end face distance between the second left half output gear and the second right half output gear is L2, and L1=L2.

3. The electric drive axle according to claim 1, characterized in that: The centralized transmission shaft assembly further includes: two first support bearings, the two first support bearings are respectively sleeved on the outer sides of the two first output shafts; The distributed transmission shaft assembly further includes: two second support bearings, the two second support bearings are respectively sleeved on the outer sides of the two second output shafts; The two first support bearings and the two second support bearings are located at the same position on the reduction gearbox housing.

4. The electric drive axle according to claim 3, characterized in that: The centralized transmission shaft assembly also includes: A bearing seat, wherein the bearing seat is sleeved on the outside of the first output shaft connected to the first left half output gear, one of the first support bearings is sleeved on the bearing seat, and another of the first support bearings is sleeved on the bridge housing outside the other first output shaft.

5. The electric drive axle according to claim 3, characterized in that: In the distributed transmission shaft assembly, one of the second output shafts is integrally formed with the second left-half output gear, and another of the second output shafts is integrally formed with the second right-half output gear; The inner rings of the two second support bearings are respectively covered and fixed on the two second output shafts.

6. The electric drive bridge according to any one of claims 1 to 5, characterized in that: The distributed transmission shaft assembly also includes: A sleeve inner shaft, the sleeve inner shaft is coaxially and fixedly connected to one end of the second output shaft; A sleeve sleeve, the sleeve sleeve is coaxially and fixedly connected to one end of the second output shaft, and the sleeve sleeve is sleeved outside the sleeve inner shaft; A sleeve bearing, the sleeve bearing is located between the sleeve inner shaft and the sleeve sleeve; Wherein, the second left half input gear is fixedly connected to the sleeve sleeve, and the second right half input gear is fixedly connected to the sleeve inner shaft.

7. The electric drive axle according to claim 6, characterized in that: The second left half input gear is integrally formed with the sleeve sleeve; The corresponding second output shaft is formed with a flange at the end, and the flange is connected to the second left half input gear through a fastener.

8. The electric drive axle according to claim 6, characterized in that: The sleeve inner shaft is provided with an external thread at one end away from the second output shaft connected thereto; The distributed transmission shaft assembly further comprises: a locking nut screwed onto the external thread on the sleeve inner shaft, wherein the locking nut is used to tighten the sleeve bearing.

9. The electric drive axle according to claim 6, characterized in that: The sleeve inner shaft, the connected second output shaft and the second right half output gear are integrally formed.

10. A power system, characterized in that: include: The electric drive bridge according to any one of claims 1 to 9; The left-half input motor and the right-half input motor, when the centralized transmission shaft assembly is installed in the reduction gear housing, the output ends of the left-half input motor and the right-half input motor are both meshed and transmitted with the first input gear; when the distributed transmission shaft assembly is installed in the reduction gear housing, the output end of the left-half input motor is meshed and transmitted with the second left-half input gear, and the output end of the right-half input motor is meshed and transmitted with the second right-half input gear.

Images