Speed reducer for coaxial distributed driving and vehicle

Abstract

The invention discloses a speed reducer for coaxial distributed driving and a vehicle, and relates to the field of double-motor electric driving assemblys.The speed reducer for coaxial distributed driving comprises a star wheel assembly and an oil stirring assembly, and the star wheel assembly comprises a planet carrier body; the end face, facing the motor shaft, of the planet carrier body is provided with a power input shaft used for being arranged on the periphery of the motor shaft in a sleeving mode, and the outer wall of the power input shaft is meshed with a plurality of planet gears capable of rotating. The oil stirring assembly comprises an oil stirring disc located between the planet carrier body and the planet gears and connected with the planet carrier body, the oil stirring disc comprises a plurality of protruding columns with the same number as the planet gears, each protruding column is provided with one planet gear, and oil stirring ribs protruding out of the surface of the oil stirring disc are arranged between every two adjacent protruding columns. According to the bearing, splashing lubrication of lubricating oil can be achieved through rotation of the speed reducer, an additional electronic pump is not needed for oil supply, and meanwhile the problem of local stress concentration of a traditional needle bearing is solved.

Description

Technical Field

[0001] The present invention relates to the field of distributed dual-motor electric drive assemblies, and in particular to a reducer and a vehicle for coaxial distributed drive. Background Art

[0002] With the development of the new energy industry, passenger car customers have strong demands for acceleration performance, body control, off-road climbing and other functions. Accordingly, it will promote the development of new energy electric drive assemblies towards high speed, high torque and high power density. The traditional single motor + reducer + differential electric drive solution can ensure that the vehicle is driven when the left and right wheel speeds are different, but it cannot actively control the speed and torque of the left and right wheels. In extreme road conditions such as ice and deserts, wheel slip is inevitable, affecting driving safety and performance. The distributed drive solution is a dual-motor electric drive solution, which uses one motor on each side and two reducers on the left and right sides. The function of the differential is realized through motor control, and the speed and torque of the left and right wheel ends can be independently adjusted in real time to meet the driving needs of customers.

[0003] For distributed drive solutions, the lubrication of gears and bearings in the reducer relies on forced cooling. Currently, an electronic pump is used to pump oil from a low position into the center hole of the shaft, and then radially throw it out to the bearing for cooling. In this solution, the electronic pump needs to run all the time, which consumes a lot of energy. In addition, since the viscosity of the oil is higher at low temperatures, it leads to untimely oil absorption and causes NVH problems. At the same time, the planetary gears and the planetary carrier in the planetary gear set are often supported by needle roller bearings, mainly because the needle rollers and the planetary gears have a clearance fit, which is easy to assemble. However, this structure is often not conducive to the load-bearing capacity of the gears. Under high torque, it is easy to cause gear deflection and cause NVH problems. Summary of the Invention

[0004] The present application provides a reducer and vehicle for coaxial distributed drive, which can solve the technical problems in the prior art that lubricating oil is pumped into the reducer by an electronic pump, increasing energy consumption. At the same time, the planetary gears and the frame in the planetary gear array are often supported by needle bearings, which is not conducive to the load-bearing of the gears. Under high torque, it is easy to cause gear deflection and lead to NVH.

[0005] In a first aspect, an embodiment of the present application provides a reducer for coaxial distributed drive, comprising: A planetary gear assembly, the planetary gear assembly comprising a planetary carrier, the planetary carrier being provided with a power input shaft sleeved around the outer periphery of the motor shaft on its end surface facing the motor shaft, and a plurality of rotatable planetary gears being meshed on the outer wall of the power input shaft; An oil stirring assembly, the oil stirring assembly includes an oil stirring plate located between the planetary carrier body and the planetary gears and connected to the planetary carrier body, the oil stirring plate includes a plurality of raised columns with the same number as the planetary gears, each of the raised columns is provided with a planetary gear, and an oil stirring rib protruding from the surface of the oil stirring plate is provided between two adjacent raised columns, and oil collecting grooves are provided on both sides of the oil stirring ribs.

[0006] In combination with the first aspect, in one embodiment, the planetary carrier body is provided with a fixing groove protruding from the surface of the planetary carrier body 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 the inner circumferential wall of the fixing groove is provided with a first bearing sleeved on the outer periphery of the power input shaft.

[0007] In one embodiment, the power input shaft includes a first end and a second end, the first end is used to be embedded in the inner ring of the first bearing, the inner wall of the second end is used to fit on the outer periphery of the motor shaft output end, and the outer wall of the second end is used to engage with the planetary gear.

[0008] In one embodiment, it also includes an outer shell, the planetary carrier body is used to be provided with a protruding hub connection end away from an end face facing the motor shaft, the outer periphery of the hub connection end is provided with a second bearing, and the outer ring of the second bearing is used to be fixedly connected to the outer shell.

[0009] In one embodiment, a fixing ring is provided on an end surface of the first bearing and the second bearing away from the planet carrier body.

[0010] In one embodiment, an outer gear ring is fixedly provided on the inner wall of the outer shell and is located opposite to the planetary gears, and the inner wall of the outer gear ring is engaged with the outer walls of multiple planetary gears at the same time.

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

[0012] In one embodiment, a locking nut is further provided on the raised column of the oil stirring plate. The locking nut is located at an end of the third bearing away from the planetary carrier body and abuts against the end surface 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 is toward the center point of the oil stirring plate, and the other end of the first rib is diffused in an arc shape toward a direction away from the center point of the oil stirring plate, one end of the second rib is connected to the middle part of the first rib to form a whole, and the other end is diffused in an arc shape toward a direction away from the center point of the oil stirring plate, and the diffused end of the first rib is separated from the diffused end of the second rib by a certain distance.

[0014] In the second aspect, an embodiment of the present application provides a vehicle, which includes the above-mentioned reducer for coaxial distributed drive, and when the vehicle includes two groups of the reducers, the two groups of the reducers are located on the front axle or rear axle of the vehicle. When the two groups of the reducers are located on the front axle of the vehicle, one reducer is connected to the independent left hub motor of the front axle, and the other reducer is connected to the independent right hub motor of the front axle. When the two groups of the reducers are located on the rear axle of the vehicle, one reducer is connected to the independent left hub motor of the rear axle, and the other reducer is connected to the independent right hub motor of the rear axle. When the vehicle includes four groups of the reducers, the four groups of the reducers are respectively connected to the four independent hub motors of the vehicle.

[0015] The beneficial effects of the technical solutions provided in the embodiments of the present application include: 1. This application integrates an oil stirring plate and oil stirring ribs to achieve oil splash lubrication by utilizing the reducer's own rotation. This eliminates the need for an additional electronic pump to supply oil, reduces energy loss, and improves system efficiency. The curved herringbone design of the oil stirring ribs optimizes the direction of oil flow and cooperates with the oil collecting grooves to collect lubricating oil, ensuring that key parts such as planetary gears and bearings are fully lubricated to avoid dry friction. 2. The traditional needle roller bearings are eliminated, and the planetary gears are directly installed on the raised columns of the oil stirring plate. The structure is more stable and avoids the gear deflection problem caused by the deformation of the needle roller bearing under large torque. The connection between the planetary gears and the raised columns reduces the vibration and noise during gear meshing (improves NVH), which is especially suitable for high-torque electric drive scenarios. The planetary gears evenly bear the torque through the raised columns, avoiding the local stress concentration problem of traditional needle roller bearings and extending the gear life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A top view of a reducer for coaxial distributed drive provided in an embodiment of the present application; Figure 2 A longitudinal sectional view of a reducer for coaxial distributed drive provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of an oil stirring plate in a speed reducer for coaxial distributed drive provided in an embodiment of the present application; Figure 4 A schematic diagram of the structure of a planetary carrier in a reducer for coaxial distributed drive provided in an embodiment of the present application; Figure 5A schematic diagram of the outer shell structure of a reducer for coaxial distributed drive provided in an embodiment of the present application.

[0018] In the figure: 1. Planetary carrier; 101. Shaft fixing groove; 102. Hub connecting end; 2. Planetary gear; 3. Oil stirring plate; 301. Raised column; 302. Oil stirring rib; 303. Oil collecting groove; 4. First bearing; 5. Power input shaft; 501. First end; 502. Second end; 6. Outer shell; 7. Second bearing; 8. Fixing snap ring; 9. Outer gear ring; 10. Third bearing; 11. Locking nut. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] On the one hand, the embodiment of the present application provides a reducer for coaxial distributed drive, which can solve the technical problems in the prior art that the lubricating oil relies on an electronic pump to pump into the reducer, increasing energy consumption. At the same time, the planetary gears and the frame in the planetary gear array are often supported by needle bearings, which is not conducive to the load-bearing of the gears. Under high torque, it is easy to cause gear deflection and lead to NVH.

[0021] The reducer for coaxial distributed drive in this application includes a planetary wheel assembly and an oil stirring assembly, which improves the traditional planetary wheel support structure, replaces the traditional needle bearings, improves the axial and radial stiffness of the planetary wheel set, and reduces deformation. At the same time, an oil stirring assembly is added to the planetary wheel assembly, which can rotate synchronously with the reducer, forming a centrifugal pump effect during rotation, completely eliminating the electronic oil pump, relying on mechanical rotation for lubrication, and reducing system energy consumption.

[0022] Specifically, Figure 1 A top view of a reducer for coaxial distributed drive provided in an embodiment of the present application, such as Figure 1 As shown, the planetary gear assembly includes a planetary carrier body 1, which is a disc-shaped structure as a whole. It has an end face facing the motor shaft and the end face is connected to the motor shaft, and has an end face facing the vehicle wheel hub and the end face is connected to the vehicle wheel hub. When the motor shaft rotates, through the meshing action of the internal gears of the reducer, the high speed and low torque input by the motor shaft are converted into low speed and high torque after the meshing of the reducer gears and are transmitted to the planetary carrier body 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 the present application, as shown Figure 2 As shown, the planetary carrier 1 is provided with a power input shaft 5 on the end face facing the motor shaft. The power input shaft 5 is sleeved on the outer periphery of the motor shaft. When the motor shaft rotates, the power input shaft 5 rotates synchronously and transmits torque to the internal gear of the reducer. The speed of the power input shaft 5 is consistent with that of the motor shaft and is higher than the speed of the planetary carrier 1.

[0024] For further information, see Figure 1 、 Figure 2 The outer wall of the power input shaft 5 is engaged with a plurality of self-rotating planetary gears 2. In a possible embodiment of the present application, the planetary gears 2 are configured into three groups. The three groups of planetary gears 2 are equidistantly arranged on the outer circumferential wall of the power input shaft 5 and are engaged with the outer circumference of the power input shaft 5 at the same time. The torque generated by the power input shaft 5 is evenly transmitted to the three groups of planetary gears 2.

[0025] For further information, see Figure 2 The oil stirring assembly includes an oil stirring plate 3 located between the planetary carrier body 1 and the planetary gear 2 and connected to the planetary carrier body 1. The oil stirring plate 3 is a disc-shaped structure, and its cross-section is preferably equal to the cross-section of the planetary carrier body 1 and is arranged concentrically with the planetary carrier body 1. The planetary carrier body 1 and the oil stirring plate 3 are connected to form an integral whole by bolts or welding so that the oil stirring plate 3 rotates synchronously with the planetary carrier body 1.

[0026] Figure 3 A schematic diagram of the structure of the oil stirring plate 3 in a coaxial distributed drive reducer provided in an embodiment of the present application is shown as follows: Figure 3 As shown, the oil stirring plate 3 includes a plurality of raised columns 301, the same number as the planetary gears 2, and each raised column 301 is provided with a planetary gear 2. In combination with the above description, the raised columns 301 in the present application are preferably three groups to correspond to the three groups of planetary gears 2. The three groups of planetary gears 2 are driven by the power input shaft 5 and rotate around their respective corresponding raised columns 301 at the same time. Compared with the traditional needle bearing support method, the connection method in the present application can increase the contact area between the two, disperse the load, reduce local stress, and at the same time, suppress the overturning moment and avoid meshing misalignment caused by gear deflection.

[0027] For further information, see Figure 3 , between two adjacent raised columns 301, there is an oil stirring rib 302 protruding from the surface of the oil stirring plate 3, and there are oil collecting grooves 303 on both sides of the oil stirring rib 302. Due to gravity, the lubricating oil flowing back to the reducer from the motor generally accumulates under the star wheel assembly, and the bottom of the oil stirring plate 3 is immersed in the accumulated oil ( Figure 3The shadow is oil), when the stirring oil pan 3 rotates, the stirring oil rib 302 will drive part of the oil to be thrown out, directly splashing to the meshing surface of the planetary gear 2 and other structures, without the need for an electronic pump to achieve continuous lubrication, at the same time, the oil collecting groove 303 can collect the oil accumulated under the stirring oil rib 302 and overflow.

[0028] Further, Figure 4 A planetary carrier body 1 structure schematic diagram for a coaxial distributed drive reducer is provided for the embodiments of the present application, as shown in Figure 4 The planetary carrier body 1 is provided with an axle body fixing groove 101 protruding from the surface of the planetary carrier body 1 at the center point of the end face towards the motor shaft, a cylindrical partition plate protruding from the surface of the planetary carrier body 1 is arranged on the end face of the planetary carrier body 1 towards the motor shaft, the axle body fixing groove 101 is formed in the inner ring of the cylindrical partition plate, a through hole is formed in the middle of the oil stirring pan 3, the cylindrical partition plate passes through the through hole, and the inner wall of the cylindrical partition plate is provided with a first bearing 4, at the same time, the first bearing 4 is sleeved on the outer periphery of the power input shaft 5, so as to stably support and maintain the distance between the power input shaft 5 and the planetary carrier body 1, facilitate the self-rotation of the power input shaft 5 and the planetary carrier body 1 at different speeds, and reduce the rotation friction.

[0029] Further, as shown in Figure 4 The power input shaft 5 includes a first end 501 and a second end 502, the power input shaft 5 is axially through, the first end 501 has a smaller inner diameter, which is used to be embedded in the inner ring of the first bearing 4 and connected with the inner ring of the first bearing 4 to maintain the relative static state with the inner ring of the first bearing 4, the second end 502 has a larger diameter and is sleeved on the outer periphery of the motor shaft to maintain the relative static state with the motor shaft, the second end 502 and the motor shaft can be interference fitted, or a fixing member or any other way can be arranged, the present application does not make specific limitation, and the outer wall of the second end 502 is provided with a flower tooth for engaging with the planetary gear 2.

[0030] Further, Figure 5 A housing body 6 structure schematic diagram for a coaxial distributed drive reducer is provided for the embodiments of the present application, as shown in Figure 5 The reducer in the present application further includes a housing body 6, the housing body 6 is wrapped outside the star wheel assembly and the oil stirring assembly, and the housing body 6 always maintains a static state, the above-mentioned lubricating oil accumulates in the housing body 6, the reducer housing body 6 can be configured according to conventional means, generally, the housing body 6 is axially through for connecting the planetary carrier body 1 of the motor shaft and the hub end, the specific form of the housing body 6 can match the form of the star wheel assembly in the present application, and the connecting points on the outer surface thereof can be configured by conventional means, and the present application does not make specific limitation.

[0031] Further, as shown in Figure 4, the planet carrier body 1 is provided with a convex hub connecting end 102 away from the end face towards the motor shaft, the outer periphery of the hub connecting end 102 is sleeved with a second bearing 7, the outer ring of the second bearing 7 is used for fixed connection with the outer shell 6, the hub connecting end 102 is adapted with the vehicle hub, and is connected by using a flange. The specific form can be flexible based on different vehicle models, and the application is not specifically limited. The outer ring of the second bearing 7 is fixedly connected with the outer shell 6 and remains fixed at all times. The inner ring of the second bearing 7 remains relatively stationary with the planet carrier body 1.

[0032] Further, see Figure 4 , the first bearing 4 and the second bearing 7 are provided with a fixed clamping ring 8 away from the end face of the planet carrier body 1, the fixed clamping ring 8 is used for preventing the first bearing 4 and the second bearing 7 from being out of position and preventing it from coming out of the planet carrier body 1. The conventional means can be configured, and will not be described in detail here.

[0033] Further, see Figure 2 , the outer shell 6 is further provided with an outer ring gear 9 opposite the position of the planetary gear 2, and the inner wall of the outer ring gear 9 is simultaneously engaged with the outer wall of the plurality of planetary gears 2. The outer ring gear 9 also remains in a fixed state at all times, serving as a reaction force fulcrum to force the planetary gear 2 to "roll" along the inner wall of the outer ring gear 9 while rotating, and to enhance the overall stiffness of the planetary gear 2, reducing gear deflection. At the same time, the inner teeth of the outer ring gear 9 are simultaneously engaged with the plurality of planetary gears 2 to share the load and reduce the stress on individual teeth.

[0034] Further, see Figure 2 , the third bearing 10 is provided between the protruding column 301 of the oil stirring disc 3 and the planetary gear 2. As described above, the protruding column 301 is configured in three groups, so in this application, the number of third bearings 10 is also three. In one embodiment of the application, the inner wall of the planetary gear 2 is provided with a circumferential protrusion, and the third bearing 10 is arranged on the side of the circumferential protrusion away from the planet carrier body 1. The protruding column 301 of the oil stirring disc 3 is further provided with a locking nut 11, which is located at the end of the third bearing 10 away from the planet carrier body 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, see Figure 3The oil stirring ribs 302 include first and second ribs. These ribs form an arcuate herringbone structure, with their arcs aligning with the direction of rotation of the oil stirring plate 3. Specifically, one end of the first rib faces the center of the oil stirring plate 3, while the other end of the first rib spreads out in an arc away from the center of the oil stirring plate 3. One end of the second rib is connected to the middle of the first rib to form a single piece, while the other end spreads out in an arc away from the center of the oil stirring plate 3. The diverging ends of the first and second ribs are spaced a certain distance apart. When the oil stirring plate 3 rotates, the first and second ribs follow the direction of rotation of the oil stirring plate 3, reducing flow resistance. At the same time, centrifugal force guides the oil from the center to the periphery, forming a spiral oil flow, improving oil coverage and mixing uniformity within the cavity.

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

[0037] On the second aspect, an embodiment of the present application provides a vehicle, which includes two or four groups of the above-mentioned reducers for coaxial distributed drive. Specifically, current vehicles basically have three drive modes, namely front-wheel drive, rear-wheel drive and four-wheel drive. The reducers in this application are flexibly configured in two or four groups according to the drive mode of the vehicle model to be installed. Specifically, when the vehicle model to be installed is front-wheel drive, it includes two groups of reducers in this application, and the left and right hub motors of the vehicle are respectively connected to a reducer and drive the front wheels to realize dual-motor drive of the front axle. By independently adjusting the left / right motor speed, the cornering stability is optimized, such as deceleration of the inner wheel and acceleration of the outer wheel. Similarly, when the vehicle model to be installed is rear-wheel drive, it will also include two groups of reducers in this application, which are configured on the rear axle of the vehicle and respectively connected to the left and right hub motors. When the vehicle is four-wheel drive, it includes four groups of reducers in this application, and the four groups of reducers are respectively connected to the four independent hub motors of the vehicle.

[0038] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings 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 only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0040] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present 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 the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A reducer for coaxial distributed drive, characterized in that: include: A planetary gear assembly, comprising a planetary carrier (1), the planetary carrier (1) being provided with a power input shaft (5) for sleeved on the outer periphery of the motor shaft on its end surface facing the motor shaft, the outer wall of the power input shaft (5) being meshed with a plurality of planetary gears (2) capable of self-rotation; An oil stirring assembly, the oil stirring assembly comprising an oil stirring plate (3) located between the planetary frame (1) and the planetary gear (2) and connected to the planetary frame (1), the oil stirring plate (3) comprising a plurality of raised columns (301) the same number as the planetary gears (2), each of the raised columns (301) being provided with a planetary gear (2), an oil stirring rib (302) protruding from the surface of the oil stirring plate (3) being provided between two adjacent raised columns (301), and oil collecting grooves (303) being provided on both sides of the oil stirring rib (302).

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

3. A reducer for coaxial distributed drive according to claim 2, characterized in that: The power input shaft (5) comprises a first end (501) and a second end (502), wherein 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 be sleeved on 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. The reducer for coaxial distributed drive according to claim 2, characterized in that: It also includes an outer shell (6), the planetary carrier body (1) is provided with a protruding hub connection end (102) on one end surface facing away from the motor shaft, a second bearing (7) is sleeved on the outer periphery of the hub connection end (102), and the outer ring of the second bearing (7) is fixedly connected to the outer shell (6).

5. The reducer for coaxial distributed drive according to claim 4, characterized in that: A fixing snap ring (8) is provided on one end surface of the first bearing (4) and the second bearing (7) away from the planet carrier body (1).

6. The reducer for coaxial distributed drive according to claim 4, characterized in that: An outer gear ring (9) is fixedly provided on the inner wall of the outer shell (6) and is positioned opposite to the planetary gears (2), and the inner wall of the outer gear ring (9) is simultaneously meshed with the outer walls of a plurality of the planetary gears (2).

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

8. The reducer for coaxial distributed drive according to claim 7, characterized in that: A locking nut (11) is also provided on the raised column (301) of the oil stirring plate (3). The locking nut (11) is located at an end of the third bearing (10) away from the planetary carrier body (1) and abuts against the end surface of the third bearing (10).

9. The reducer for coaxial distributed drive according to claim 8, characterized in that: The oil stirring rib (302) includes a first rib and a second rib, wherein one end of the first rib is directed toward the center point of the oil stirring plate (3), and the other end of the first rib is diffused in an arc shape toward 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 a whole, and the other end is diffused in an arc shape toward a direction away from the center point of the oil stirring plate (3), and the diffused end of the first rib is spaced a certain distance from the diffused end of the second rib.

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

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