A reducer and vehicle for coaxial distributed drive

Abstract

This invention discloses a reducer and vehicle for coaxial distributed drive, relating to the field of dual-motor electric drive assemblies. The reducer for coaxial distributed drive includes a planetary gear assembly and an oil churning assembly. The planetary gear assembly includes a planetary carrier, with a power input shaft fitted onto the outer circumference of the motor shaft at its end face facing the motor shaft. Multiple self-rotating planetary gears mesh on the outer wall of the power input shaft. The oil churning assembly includes an oil churning disc located between the planetary carrier and the planetary gears and connected to the planetary carrier. The oil churning disc includes multiple protrusions equal in number to the planetary gears, with a planetary gear mounted on each protrusion. Oil churning ribs protruding from the surface of the oil churning disc are provided between adjacent protrusions, and oil collecting grooves are provided on both sides of the oil churning ribs. This application can achieve lubrication by splashing lubricating oil using the reducer's own rotation, eliminating the need for an additional electronic pump for oil supply, while avoiding the problem of local stress concentration in traditional needle roller bearings.

Description

Technical Field

[0001] This invention relates to the field of distributed dual-motor electric drive assemblies, and more specifically to a reducer and vehicle for coaxial distributed drive. Background Technology

[0002] With the development of the new energy industry, passenger vehicle customers have strong demands for acceleration performance, vehicle handling, and off-road climbing capabilities. Correspondingly, this will drive the development of new energy electric drive assemblies towards higher speeds, higher torque, and higher power density. Traditional single-motor + reducer + differential electric drive solutions can ensure vehicle propulsion even when the left and right wheels rotate at different speeds, but they cannot actively control the speed and torque of the left and right wheels. In extreme road conditions such as ice or desert, wheel slippage is inevitable, affecting driving safety and performance. Distributed drive solutions are dual-motor electric drive solutions, using one motor on each side matched with two reducers on the left and right sides. The motors control the differential function, allowing for real-time independent adjustment of the speed and torque of the left and right wheels to meet customer driving needs.

[0003] For distributed drive schemes, the gears and bearings in the reducer are lubricated by forced cooling. Currently, an electric pump is often used to pump oil from a low position into the center hole of the shaft, and then throw it radially to the bearing for cooling. In this scheme, the electric pump needs to run continuously, which consumes a lot of energy. Moreover, because the oil viscosity is higher at low temperatures, it leads to untimely oil suction and causes NVH problems. At the same time, the planetary gears and planetary carriers in the planetary gear set are often supported by needle roller bearings, mainly because the needle rollers and planetary gears have a clearance fit, which is easy to assemble. However, this structure is often unfavorable for the load-bearing capacity of the gears. Under high torque, it is easy to cause gear misalignment, resulting in NVH problems. Summary of the Invention

[0004] This application provides a reducer and vehicle for coaxial distributed drive, which can solve the technical problems in the prior art where lubricating oil is pumped into the reducer by an electronic pump, increasing energy consumption. At the same time, the method of supporting the planetary gears and the carrier body in the planetary gear set with needle roller bearings is not conducive to the load-bearing capacity of the gears. Under high torque, it is easy to cause gear misalignment, resulting in NVH.

[0005] In a first aspect, embodiments of this application provide a speed reducer for coaxial distributed drive, comprising: A star wheel assembly, comprising a planetary carrier, wherein the planetary carrier is provided with a power input shaft for sleeved on the outer periphery of the motor shaft at its end face facing the motor shaft, and a plurality of self-rotating planetary gears are meshed on the outer wall of the power input shaft; An oil stirring assembly includes an oil stirring disc located between the planetary carrier and the planetary gears and connected to the planetary carrier. The oil stirring disc includes a plurality of protruding pillars, the same number as the planetary gears. Each protruding pillar is provided with a planetary gear. An oil stirring rib protruding from the surface of the oil stirring disc is provided between two adjacent protruding pillars, and oil collecting grooves are provided on both sides of the oil stirring rib.

[0006] In conjunction with the first aspect, in one embodiment, the planetary carrier is provided with a fixing groove protruding from the surface of the planetary carrier at the center point of one end face facing the motor shaft, and the fixing groove passes through the center point of the oil stirring plate, and a first bearing sleeved on the inner circumferential wall of the fixing groove is provided on the outer circumference of the power input shaft.

[0007] In one embodiment, the power input shaft includes a first end and a second end, the first end being used to be fitted into the inner ring of a first bearing, the inner wall of the second end being used to fit around the outer periphery of the output end of the motor shaft, and the outer wall of the second end being used to mesh with a planetary gear.

[0008] In one embodiment, the system further includes an outer shell, wherein the planetary carrier has a protruding hub connection end on one end face away from the motor shaft, and a second bearing is fitted around the outer periphery of the hub connection end, the outer ring of the second bearing being fixedly connected to the outer shell.

[0009] In one embodiment, both the first bearing and the second bearing have retaining rings on their ends away from the planetary carrier.

[0010] In one embodiment, the inner wall of the outer casing is further fixedly provided with an outer gear ring that is positioned opposite to the planetary gears, and the inner wall of the outer gear ring simultaneously meshes with the outer walls of multiple planetary gears.

[0011] In one embodiment, a third bearing is provided between the protruding column of the oil stirring disc and the planetary gear.

[0012] In one embodiment, a locking nut is also provided on the protruding post of the oil stirring disc. The locking nut is located at the end of the third bearing away from the planetary carrier and abuts against the end face of the third bearing.

[0013] In one embodiment, the oil-stirring rib includes a first rib and a second rib. One end of the first rib faces the center point of the oil-stirring disc, and the other end of the first rib spreads out in an arc shape in a direction away from the center point of the oil-stirring disc. One end of the second rib is connected to the middle part of the first rib to form an integral part, and the other end spreads out in an arc shape in a direction away from the center point of the oil-stirring disc. The spreading end of the first rib and the spreading end of the second rib are spaced apart by a certain distance.

[0014] Secondly, embodiments of this application provide a vehicle that includes the aforementioned reducer for coaxial distributed drive. When the vehicle includes two sets of the reducers, the two sets of reducers are located on the front or rear axle of the vehicle. When the two sets of reducers are located on the front axle, one reducer is connected to an independent left hub motor of the front axle, and the other reducer is connected to an independent right hub motor of the front axle. When the two sets of reducers are located on the rear axle, one reducer is connected to an independent left hub motor of the rear axle, and the other reducer is connected to an independent right hub motor of the rear axle. When the vehicle includes four sets of the reducers, the four sets of reducers are respectively connected to four independent hub motors of the vehicle.

[0015] The beneficial effects of the technical solutions provided in this application include: 1. This application integrates an oil stirring disc and an oil stirring rib combination structure, and uses the rotation of the reducer itself to achieve lubricating oil splash lubrication, eliminating the need for an additional electronic pump to supply oil, reducing energy loss and improving system efficiency. The arc-shaped herringbone design of the oil stirring rib optimizes the direction of oil flow, and the oil collection groove collects lubricating oil to ensure sufficient lubrication of key parts such as planetary gears and bearings, and avoids dry friction. 2. The traditional needle roller bearing is eliminated, and the planetary gear is directly mounted on the raised post of the oil stirring plate. The structure is more stable and avoids the gear misalignment problem caused by the deformation of the needle roller bearing under high torque. The connection between the planetary gear and the raised post reduces vibration and noise during gear meshing (improving NVH), which is especially suitable for high torque electric drive scenarios. The planetary gear evenly bears the torque through the raised post, avoiding the local stress concentration problem of the traditional needle roller bearing and extending the gear life. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A top view of a reducer for coaxial distributed drive provided in an embodiment of this application; Figure 2 A longitudinal sectional view of a reducer for coaxial distributed drive provided in an embodiment of this application; Figure 3 A schematic diagram of the oil stirring disc structure in a reducer for coaxial distributed drive provided in an embodiment of this application; Figure 4 A schematic diagram of a planetary carrier structure in a reducer for coaxial distributed drive provided in an embodiment of this application; Figure 5This is a schematic diagram of the housing structure of a reducer used for coaxial distributed drive, provided in an embodiment of this application.

[0018] In the diagram: 1. Planetary carrier; 101. Shaft fixing groove; 102. Hub connection end; 2. Planetary gear; 3. Oil stirring disc; 301. Protruding column; 302. Oil stirring rib; 303. Oil collecting groove; 4. First bearing; 5. Power input shaft; 501. First end; 502. Second end; 6. Outer housing; 7. Second bearing; 8. Retaining ring; 9. External gear ring; 10. Third bearing; 11. Locking nut. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0020] Firstly, the embodiments of this application provide a reducer for coaxial distributed drive, which can solve the technical problems in the prior art where lubricating oil is pumped into the reducer by an electronic pump, increasing energy consumption. At the same time, the planetary gears in the planetary gear set are often supported by needle roller bearings, which is not conducive to the load-bearing capacity of the gears. Under high torque, it is easy to cause gear misalignment, resulting in NVH.

[0021] The reducer for coaxial distributed drive in this application includes a star gear assembly and an oil churning assembly. It improves the traditional planetary gear support structure, replaces the traditional needle roller bearing, improves the axial and radial stiffness of the planetary gear set, and reduces deformation. At the same time, an oil churning assembly is added to the star gear assembly, which can rotate synchronously with the reducer. When rotating, it forms a centrifugal pump effect, completely eliminating the electronic oil pump and relying on mechanical rotation to achieve lubrication, thereby reducing system energy consumption.

[0022] Specifically, Figure 1 A top view of a reducer for coaxial distributed drive provided in an embodiment of this application, as shown below. Figure 1 As shown, the planetary gear assembly includes a planetary carrier 1, which is a disc-shaped structure. It has an end face facing the motor shaft and connected to the motor shaft, and an end face facing the vehicle wheel hub and connected to the vehicle wheel hub. When the motor shaft rotates, the high speed and low torque input from the motor shaft are transformed into low speed and high torque through the meshing of the gears inside the reducer and transmitted to the planetary carrier 1, and finally output to the vehicle wheel hub.

[0023] Figure 2A longitudinal sectional view of a reducer for coaxial distributed drive provided in an embodiment of this application, such as... Figure 2 As shown, the planetary carrier 1 has a power input shaft 5 on its end face facing the motor shaft. The power input shaft 5 is sleeved on the outer circumference of the motor shaft. When the motor shaft rotates, the power input shaft 5 rotates synchronously and transmits torque to the gear inside the reducer. The speed of the power input shaft 5 is the same as that of the motor shaft and is higher than that of the planetary carrier 1.

[0024] Further details can be found here. Figure 1 , Figure 2 The outer wall of the power input shaft 5 is meshed with multiple planetary gears 2 that can rotate. In one possible embodiment of this application, the planetary gears 2 are configured in three sets. The three sets of planetary gears 2 are equidistantly arranged on the outer circumferential wall of the power input shaft 5 and mesh with the outer circumference of the power input shaft 5 at the same time. The torque generated by the power input shaft 5 is uniformly transmitted to the three sets of planetary gears 2.

[0025] Further details can be found here. Figure 2 The oil stirring assembly includes an oil stirring disc 3 located between the planetary carrier 1 and the planetary gear 2 and connected to the planetary carrier 1. The oil stirring disc 3 is a disc-shaped structure, and its cross-section is preferably equal to that of the planetary carrier 1 and is set at the same center as the planetary carrier 1. The planetary carrier 1 and the oil stirring disc 3 are connected by bolts or welding to form an integral unit so that the oil stirring disc 3 rotates synchronously with the planetary carrier 1.

[0026] Figure 3 This application provides a schematic diagram of the oil stirring disc 3 structure in a reducer for coaxial distributed drive, as shown in the embodiment of the present application. Figure 3 As shown, the oil stirring plate 3 includes a plurality of protruding pillars 301, the same number as the planetary gears 2. Each protruding pillar 301 is provided with a planetary gear 2. In conjunction with the above description, the protruding pillars 301 in this application are preferably three sets to correspond to three sets of planetary gears 2. Under the drive of the power input shaft 5, the three sets of planetary gears 2 rotate around their respective protruding pillars 301 at the same time. Compared with the traditional needle roller bearing support method, the connection method in this application can increase the contact area between the two, distribute the load, reduce local stress, suppress overturning moment, and avoid meshing misalignment caused by gear skew.

[0027] Further details can be found here. Figure 3 Between two adjacent protruding columns 301, there is an oil-stirring rib 302 protruding from the surface of the oil-stirring disc 3, and oil-collecting grooves 303 are provided on both sides of the oil-stirring rib 302. Due to gravity, the lubricating oil flowing back from the motor to the reducer generally accumulates below the star wheel assembly, and the bottom of the oil-stirring disc 3 is immersed in the accumulated oil. Figure 3(The shaded area represents the oil). When the oil stirring plate 3 rotates, the oil stirring ribs 302 will cause some oil to be thrown out and splash directly onto the meshing surface of the planetary gear 2 and other structures. Continuous lubrication can be achieved without an electronic pump. At the same time, the oil collecting groove 303 can collect the oil accumulated under the oil stirring ribs 302 and then overflow.

[0028] Furthermore, Figure 4 This application provides a schematic diagram of the planetary carrier 1 structure in a reducer for coaxial distributed drive, as shown in the embodiment of the present application. Figure 4 As shown, the planetary carrier 1 has a shaft fixing groove 101 protruding from the surface of the planetary carrier 1 at the center point of one end face facing the motor shaft. A cylindrical partition plate protruding from the surface of the planetary carrier 1 is provided on the end face of the planetary carrier 1 facing the motor shaft. The inner ring of the cylindrical partition plate forms the shaft fixing groove 101. A through hole is opened in the middle of the oil stirring plate 3, and the cylindrical partition plate passes through the through hole. A first bearing 4 is provided on the inner wall of the cylindrical partition plate. At the same time, the first bearing 4 is sleeved on the outer circumference of the power input shaft 5, so as to provide stable support for the power input shaft 5 and the planetary carrier 1, maintain the distance, facilitate the rotation of the power input shaft 5 and the planetary carrier 1 at different speeds, and reduce rotational friction.

[0029] Further details can be found here. Figure 4 The power input shaft 5 includes a first end 501 and a second end 502. The power input shaft 5 is axially continuous. The first end 501 has a smaller inner diameter and is used to be embedded in the inner ring of the first bearing 4 and connected to the inner ring of the first bearing 4 to maintain a relatively stationary state with the inner ring of the first bearing 4. The second end 502 has a larger diameter and is sleeved on the outer circumference of the motor shaft to maintain a relatively stationary state with the motor shaft. The second end 502 and the motor shaft can be interference-fitted, or a fixing part or other arbitrary method can be provided. This application does not make any specific restrictions. The outer wall of the second end 502 is provided with a toothed surface for meshing with the planetary gear 2.

[0030] Furthermore, Figure 5 A schematic diagram of the housing 6 in a reducer for coaxial distributed drive provided in an embodiment of this application is shown below. Figure 5 As shown, the reducer in this application also includes a housing 6, which is wrapped around the star wheel assembly and the oil stirring assembly. The housing 6 remains stationary at all times. The aforementioned lubricating oil accumulates inside the housing 6. The reducer housing 6 can be configured using conventional methods. Generally, the housing 6 is axially through to connect the motor shaft and the hub end to the planetary carrier 1. The specific shape of the housing 6 can match the shape of the star wheel assembly in this application. The connection points on its outer surface can be configured using conventional methods. This application does not impose any specific restrictions.

[0031] Further details can be found here. Figure 4The planetary carrier 1 has a protruding hub connection end 102 on the end face away from the motor shaft. A second bearing 7 is sleeved on the outer periphery of the hub connection end 102. The outer ring of the second bearing 7 is used to fix it to the outer shell 6. The hub connection end 102 is adapted to the vehicle hub and is connected by a flange. Conventional methods can be used, and its specific shape can be flexibly based on different vehicle models. This application does not impose any specific restrictions. The outer ring of the second bearing 7 is fixedly connected to the outer shell 6 and remains fixed at all times. The inner ring of the second bearing 7 remains relatively stationary with the planetary carrier 1.

[0032] Further details can be found here. Figure 4 The first bearing 4 and the second bearing 7 are both provided with a retaining ring 8 on the end face away from the planetary carrier 1. The retaining ring 8 is used to prevent the first bearing 4 and the second bearing 7 from being dislodged from the planetary carrier 1. It can be configured by conventional means, and will not be described in detail here.

[0033] Further details can be found here. Figure 2 The inner wall of the outer shell 6 is also fixedly provided with an outer gear ring 9 that is opposite to the position of the planetary gear 2. The inner wall of the outer gear ring 9 meshes with the outer walls of multiple planetary gears 2 at the same time. The outer gear ring 9 also always remains fixed. As a fulcrum of reaction force, it forces the planetary gear 2 to "roll" along the inner wall of the outer gear ring 9 while rotating, and enhances the overall rigidity of the planetary gear 2 and reduces gear skew. At the same time, the inner teeth of the outer gear ring 9 mesh with multiple planetary gears 2 at the same time, distributing the load and reducing the stress of a single tooth.

[0034] Further details can be found here. Figure 2 A third bearing 10 is provided between the protruding column 301 of the oil stirring plate 3 and the planetary gear 2. Based on the above description, the protruding column 301 is configured in three groups. Therefore, in this application, the number of third bearings 10 is also three. In one embodiment of this application, the inner wall of the planetary gear 2 is provided with a circumferential protrusion. The third bearing 10 is located on the side of the circumferential protrusion away from the planetary carrier 1. The protruding column 301 of the oil stirring plate 3 is also provided with a locking nut 11. The locking nut 11 is located at the end of the third bearing 10 away from the planetary carrier 1 and abuts against the end face of the third bearing 10. After the third bearing 10 is press-fitted, it is axially fixed by the locking nut 11.

[0035] Further details can be found here. Figure 3The stirring rib 302 includes a first rib and a second rib. The first and second ribs form an arc-shaped herringbone pattern, and their arc surfaces are in the same direction as the rotation of the stirring plate 3. Specifically, one end of the first rib faces the center point of the stirring plate 3, and the other end of the first rib spreads outward in an arc from the center point of the stirring plate 3. One end of the second rib is connected to the middle of the first rib to form a single unit, and the other end spreads outward in an arc from the center point of the stirring plate 3. The spreading ends of the first and second ribs are spaced a certain distance apart. When the stirring plate 3 rotates, the first and second ribs follow the rotation direction of the stirring plate 3, reducing flow resistance. At the same time, centrifugal force is used to guide the oil from the center to the outer periphery, forming a spiral oil flow, which improves the coverage and mixing uniformity of the oil in the cavity.

[0036] The working mechanism of the reducer in this application is as follows: the power input shaft 5 drives the planetary gear 2 to rotate, and then under the reaction force of the external gear ring 9, multiple planetary gears 2 will synchronously complete the revolution around the power input shaft 5. Since the planetary gear 2 is sleeved on the protruding column 301, when multiple planetary gears 2 revolve, they will drive the oil stirring plate 3 to rotate and the planetary carrier 1 to rotate.

[0037] Secondly, this application provides a vehicle that includes two or four sets of the aforementioned reducers for coaxial distributed drive. Specifically, current vehicles generally have three drive modes: front-wheel drive, rear-wheel drive, and four-wheel drive. The reducers in this application are flexibly configured in two or four sets according to the drive mode of the vehicle to be installed. Specifically, when the vehicle to be installed is front-wheel drive, it includes two sets of reducers as described in this application. The left and right wheel hub motors are each connected to a reducer and drive the front wheels, realizing dual-motor drive on the front axle. By independently adjusting the speed of the left / right motors, cornering stability is optimized, such as the inner wheel decelerating and the outer wheel accelerating. Similarly, when the vehicle to be installed is rear-wheel drive, it also includes two sets of reducers as described in this application, configured on the rear axle of the vehicle and respectively connected to the left and right wheel hub motors. When the vehicle is four-wheel drive, it includes four sets of reducers as described in this application, with the four sets of reducers respectively connected to the four independent wheel hub motors of the vehicle.

[0038] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0039] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A reducer for coaxial distributed drive, characterized in that, include: The star wheel assembly includes a planetary carrier (1), which has a power input shaft (5) for sleeved on the outer periphery of the motor shaft at its end face facing the motor shaft. The outer wall of the power input shaft (5) is meshed with a plurality of planetary gears (2) that can rotate on their own. An oil stirring assembly includes an oil stirring disc (3) located between the planetary carrier (1) and the planetary gears (2) and connected to the planetary carrier (1). The oil stirring disc (3) includes a plurality of protruding posts (301) the same number as the planetary gears (2). Each protruding post (301) is provided with a planetary gear (2). Between two adjacent protruding posts (301), there are oil stirring ribs (302) protruding from the surface of the oil stirring disc (3). Oil collecting grooves (303) are provided on both sides. The oil stirring ribs (302) include a first rib and a second rib. One end of the first rib faces the center point of the oil stirring plate (3). The other end of the first rib spreads out in an arc shape in a direction away from the center point of the oil stirring plate (3). One end of the second rib is connected to the middle part of the first rib to form an integral part. The other end spreads out in an arc shape in a direction away from the center point of the oil stirring plate (3). The spreading end of the first rib and the spreading end of the second rib are spaced a certain distance apart.

2. The reducer for coaxial distributed drive as described in claim 1, characterized in that: The planetary carrier (1) has a shaft fixing groove (101) protruding from the surface of the planetary carrier (1) at the center point of one end face facing the motor shaft, and the shaft fixing groove (101) passes through the center point of the oil stirring plate (3). The inner circumferential wall of the shaft fixing groove (101) is provided with a first bearing (4) sleeved on the outer circumference of the power input shaft (5).

3. A reducer for coaxial distributed drive as described in claim 2, characterized in that: The power input shaft (5) includes a first end (501) and a second end (502). The first end (501) is used to be embedded in the inner ring of the first bearing (4), the inner wall of the second end (502) is used to fit around the outer periphery of the motor shaft output end, and the outer wall of the second end (502) is used to mesh with the planetary gear (2).

4. A reducer for coaxial distributed drive as described in claim 2, characterized in that: It also includes an outer shell (6), the planetary carrier (1) is provided with a protruding hub connection end (102) on the end face away from the motor shaft, and a second bearing (7) is sleeved on the outer periphery of the hub connection end (102), the outer ring of the second bearing (7) is used to be fixedly connected to the outer shell (6).

5. A reducer for coaxial distributed drive as described in claim 4, characterized in that: Both the first bearing (4) and the second bearing (7) have retaining rings (8) on the end face away from the planetary carrier (1).

6. A reducer for coaxial distributed drive as described in claim 4, characterized in that: The inner wall of the outer shell (6) is also fixedly provided with an outer gear ring (9) that is opposite to the position of the planetary gear (2), and the inner wall of the outer gear ring (9) meshes with the outer walls of multiple planetary gears (2) at the same time.

7. A reducer for coaxial distributed drive as described in claim 1, characterized in that: A third bearing (10) is provided between the protruding column (301) of the oil stirring plate (3) and the planetary gear (2).

8. A reducer for coaxial distributed drive as described in claim 7, characterized in that: The oil stirring plate (3) is also provided with a locking nut (11) on the protruding column (301). The locking nut (11) is located at the end of the third bearing (10) away from the planetary carrier (1) and abuts against the end face of the third bearing (10).

9. A vehicle, characterized in that: The vehicle includes two or four sets of reducers for coaxial distributed drive as described in any one of claims 1 to 8. When the vehicle includes two sets of the reducers, the two sets of reducers are located on the front axle or the rear axle of the vehicle. When the two sets of the reducers are located on the front axle of the vehicle, one reducer is connected to an independent left wheel hub motor of the front axle, and the other reducer is connected to an independent right wheel hub motor of the front axle. When the two sets of the reducers are located on the rear axle of the vehicle, one reducer is connected to an independent left wheel hub motor of the rear axle, and the other reducer is connected to an independent right wheel hub motor of the rear axle. When the vehicle includes four sets of the reducers, the four sets of reducers are respectively connected to four independent wheel hub motors of the vehicle.

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