Two-stage NGW planetary structure wheel edge driving device

Abstract

A two-stage NGW planet structure wheel edge driving device comprises a rack coaxially arranged in a hub and further comprises a motor arranged on the inner side of the rack, a power output shaft of the motor is coaxially connected with a first-stage planet unit, and the first-stage planet unit is located on the outer side of the rack; a second-stage planetary unit is coaxially arranged between the first-stage planetary unit and the machine frame, the first-stage planetary unit and the second-stage planetary unit are in meshing transmission, and the second-stage planetary unit and the hub are in meshing transmission. Through reasonable design of parts and overall large-torque output, deformation of an inner gear ring is eliminated or reduced, a torque tube is omitted, fault risk points are reduced, and transmission stability and load uniformity are improved; meanwhile, unnecessary connecting pieces are reduced, the structure is compact, the system rigidity is improved, and the uniform load effect of the planet units is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wheel side drive, and in particular relates to a two-stage NGW planetary structure wheel side drive device. Background Art

[0002] As mining trucks become increasingly modernized and large-scale, they are widely used in the production and construction of open-pit mines. As an important device to improve the power performance of mining trucks, wheel drive boxes can meet or correct the matching of the driving force of the vehicle transmission system. With the requirements of green, efficient and intelligent mining, the reliability requirements for wheel drive systems are getting higher and higher.

[0003] The output torque of the planetary unit of the existing wheel-side drive box is transmitted to the wheel hub through the torque tube. When it is overloaded, the torque tube may be greatly deformed, reducing the transmission stability and increasing the risk of failure points; the secondary planetary unit adopts a floating planetary carrier, which does not provide sufficient support for the planetary unit, causing the planetary unit to fail early; the upper gears and bearings of the secondary planetary unit are only lubricated by splashing lubricating oil, which may lead to insufficient lubricating oil supply, causing the bearings and gears to be unable to form a stable and reliable oil film. At the same time, the existing wheel-side drive box has many connectors, a complex structure, poor system load-sharing performance, and insufficient rigidity. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a two-stage NGW planetary structure wheel-side drive device to solve the problems of deformation and other faults under large torque, as well as poor transmission stability and load balancing.

[0005] To achieve the above object, the technical solution adopted by the present invention includes:

[0006] A two-stage NGW planetary structure wheel-side drive device comprises a frame coaxially arranged in a wheel hub, and also comprises a motor arranged on the inner side of the frame, wherein the power output shaft of the motor is coaxially connected to a primary planetary unit, and the primary planetary unit is located on the outer side of the frame; a secondary planetary unit is coaxially arranged between the primary planetary unit and the frame, and the primary planetary unit and the secondary planetary unit as well as the secondary planetary unit and the wheel hub are all meshed for transmission.

[0007] Preferably, the first-stage planetary unit includes a first-stage planetary carrier, a first-stage sun gear shaft, a first-stage planetary unit and a first-stage inner gear ring; the first-stage sun gear shaft is coaxially connected to the power output shaft, the free end of the first-stage sun gear shaft extends to the outside of the frame, and a first-stage sun gear is provided on the outer periphery of the free end of the first-stage sun gear shaft; the first-stage planetary carrier is coaxially sleeved on the outer periphery of the first-stage sun gear, the first-stage planetary unit is provided in the first-stage planetary carrier, and the first-stage planetary unit is meshed with the first-stage sun gear; the first-stage inner gear ring is coaxially sleeved on the outer periphery of the first-stage planetary carrier, and the first-stage inner gear ring is meshed with the first-stage planetary unit; the first-stage planetary carrier and the second-stage planetary unit are meshed for transmission, and the first-stage inner gear ring is always fixed.

[0008] Preferably, the first-stage planetary unit includes a plurality of first-stage planetary axles uniformly fixed circumferentially in the first-stage planetary carrier, and the axis of the first-stage planetary axles is parallel to the axis of the power output shaft; a first-stage planetary gear is coaxially sleeved on the outer circumference of any first-stage planetary axle, and a first bearing is provided between any first-stage planetary axle and the first-stage planetary gear, and each first-stage planetary gear is meshed with the first-stage sun gear.

[0009] Preferably, the secondary planetary unit includes a secondary planetary carrier, a secondary sun gear shaft, a secondary planetary unit and a secondary inner gear ring; the secondary sun gear shaft is coaxially sleeved on the outer periphery of the primary sun gear shaft located on the inner side of the primary sun gear, and the secondary sun gear shaft is meshed with the primary planetary carrier; the secondary planetary carrier is coaxially sleeved on the outer periphery of the secondary sun gear shaft, the secondary planetary unit is arranged in the secondary planetary carrier, and the secondary planetary unit is meshed with the secondary sun gear shaft; the secondary inner gear ring is coaxially sleeved on the outer periphery of the secondary planetary carrier, and the secondary inner gear ring is meshed with the secondary planetary unit; the secondary inner gear ring is connected to the wheel hub, and the two sides of the secondary planetary carrier are respectively fixedly connected to the frame and the primary inner gear ring.

[0010] Preferably, the secondary planetary unit includes a plurality of secondary planetary shafts evenly arranged circumferentially in the secondary planetary carrier, and the axis of the secondary planetary shaft is parallel to the axis of the power output shaft; a secondary planetary gear is coaxially sleeved on the outer circumference of any secondary planetary shaft, and a second bearing is provided between any secondary planetary shaft and the secondary planetary gear, and each secondary planetary gear is meshed with the secondary sun gear shaft.

[0011] Preferably, an oil collecting groove is provided on the outer side of the secondary planetary carrier, the secondary planetary gear shafts are hollow inside, the inner cavity of the secondary planetary gear shafts is connected to the oil collecting groove, and the side wall of the secondary planetary gear shaft is provided with a lubrication through hole connected to its inner cavity.

[0012] Preferably, the secondary planetary gear shaft is fixedly connected to the frame.

[0013] Preferably, a third bearing is coaxially provided between the first-stage planet carrier and the second-stage planet carrier.

[0014] Preferably, at least one fourth bearing is coaxially disposed between the frame and the wheel hub.

[0015] Preferably, a pressure ring is coaxially connected to the outer end of the hub, and the inner wall of the pressure ring is meshed with the outer wall of the secondary inner gear ring for transmission.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] (1) A two-stage NGW planetary structure wheel-side drive device of the present invention has a large overall torque output through a reasonable arrangement of the component structure, eliminates or reduces the deformation of the inner ring gear, eliminates the torque tube, reduces the risk of failure points, and improves transmission stability and load balancing; at the same time, it reduces unnecessary connecting parts, has a compact structure, improves system stiffness, and improves the load balancing effect of the planetary unit.

[0018] (2) The present invention provides a two-stage NGW planetary structure wheel-side drive device, in which the first-stage planetary unit and the second-stage planetary unit are linked to the second-stage inner gear ring to rotate along its axis, thereby ultimately driving the wheel hub to rotate relative to the frame, and outputting a large overall torque, eliminating or reducing the deformation of the inner gear ring, eliminating the torque tube, improving the transmission stability and load balance, and achieving the goal of improving the service life of the gears of the two-stage planetary units; at the same time, the second-stage inner gear ring is directly connected to the wheel hub through a spline to transmit torque, eliminating the torque tube, reducing large torque transmission components, improving transmission stability, and reducing the probability of failure.

[0019] (3) Through the reasonable arrangement of the component structure, the secondary planetary unit as a whole adopts the secondary internal gear ring floating and the secondary planetary carrier fixed, which increases the supporting rigidity of the secondary planetary carrier to the secondary planetary unit and improves the meshing accuracy.

[0020] (4) The two-stage NGW planetary structure wheel-side drive device of the present invention has a reasonable arrangement of the component structure. During the transmission process, the planetary unit rotates to throw the lubricating oil into the oil collecting tank, so that more lubricating oil is delivered to the secondary planetary unit, that is, the lubricating oil is delivered from the oil collecting tank to the inner cavity of the secondary planetary gear shaft above the oil level, and then delivered to the interface between the secondary planetary gear shaft and the second bearing through the lubricating through hole, thereby effectively improving the lubrication performance of the secondary planetary unit and increasing the service life of the secondary planetary gear and the second bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a structural schematic diagram of a two-stage NGW planetary structure wheel side driving device of the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the structure of the first-level planetary unit;

[0024] Figure 3 for Figure 1 Schematic diagram of the structure of the secondary planetary unit;

[0025] Figure 4 for Figure 1 Schematic diagram of the structure of the middle-stage planet carrier;

[0026] Figure 5 for Figure 1 Schematic diagram of the structure of the second stage planet carrier.

[0027] The symbols in the figure represent:

[0028] 0 wheel hub, 1 motor, 1-1 power output shaft; 2 frame, 3 primary planetary unit, 4 secondary planetary unit, 5 first connecting shaft, 6 third bearing, 7 fourth bearing, 8 pressure ring, 8-1 second connecting shaft, 9 third connecting shaft, 9-1 pin, 10 fourth connecting shaft, 11 bearing spacer, 12 stop ring, 13 sealing tube, 14 end cover, 15 floating sealing mechanism.

[0029] 3-0 first-stage planet carrier, 3-01 first inner hole, 3-02 second inner hole; 3-1 first-stage sun gear shaft, 3-10 first-stage sun gear; 3-2 first-stage planetary unit, 3-21 first-stage planetary gear shaft, 3-22 first bearing, 3-23 first-stage planetary gear; 3-3 first-stage inner gear ring;

[0030] 4-0 secondary planet carrier, 4-01 third inner hole; 4-1 secondary sun gear shaft; 4-2 secondary planetary unit, 4-21 secondary planetary gear shaft, 4-210 lubrication through hole, 4-22 second bearing, 4-23 secondary planetary gear; 4-3 secondary inner ring gear. DETAILED DESCRIPTION

[0031] The invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the invention.

[0032] It should be noted that the directional terms mentioned in this article, such as "inner cavity", "inner periphery", "inner wall" and "outside", are consistent with the specific directions on the paper of the drawings in the specification or the corresponding directions of the space shown in the drawings; all components and equipment in the present invention, unless otherwise specified, are all components and equipment known in the prior art.

[0033] Example

[0034] This embodiment discloses a two-stage NGW planetary structure wheel side drive device, including a frame 2 coaxially arranged in a wheel hub 0, and also including a motor 1 arranged inside the frame 2, a power output shaft 1-1 of the motor 1 is coaxially connected to a primary planetary unit 3, and the primary planetary unit 3 is located outside the frame 2;

[0035] A secondary planetary unit 4 is coaxially arranged between the primary planetary unit 3 and the frame 2, and the primary planetary unit 3 and the secondary planetary unit 4 as well as the secondary planetary unit 4 and the wheel hub 0 are all meshed for transmission;

[0036] Its function is as follows: the motor 1 outputs power, which in turn drives the wheel hub 0 to rotate relative to the frame 2 through the primary planetary unit 3 and the secondary planetary unit 4, and outputs a large overall torque, eliminating or reducing the deformation of the inner ring gear, canceling the torque tube, reducing the risk of failure points, and improving transmission stability and load balancing; at the same time, it reduces unnecessary connecting parts, has a compact structure, improves system stiffness, and improves the load balancing effect of the planetary units.

[0037] A sealing tube 13 is coaxially connected between the power output shaft 1-1 of the motor 1 disclosed in this embodiment and the frame 2. The inner side of the sealing tube 13 squeezes a first rubber sealing ring located in a groove on the outer side of the motor 1. The outer flange of the sealing tube 13 is fixedly connected to the frame 2 by bolts. A second rubber sealing ring is provided at the groove on the outer side of the sealing tube 13 to cooperate with the frame 2.

[0038] The first-stage planetary unit 3 disclosed in this embodiment includes a first-stage planetary carrier 3-0, a first-stage sun gear shaft 3-1, a first-stage planetary unit 3-2 and a first-stage inner gear ring 3-3; the first-stage sun gear shaft 3-1 is coaxially connected to the power output shaft 1-1, the free end of the first-stage sun gear shaft 3-1 extends to the outside of the frame 2, and a first-stage sun gear 3-10 is provided on the outer periphery of the free end of the first-stage sun gear shaft 3-1; the first-stage planetary carrier 3-0 is coaxially sleeved on the outer periphery of the first-stage sun gear 3-10, the first-stage planetary unit 3-2 is arranged in the first-stage planetary carrier 3-0, and the first-stage planetary unit 3-2 is meshed with the first-stage sun gear 3-10; the first-stage inner gear ring 3-3 is coaxially sleeved on the outer periphery of the first-stage planetary carrier 3-0, and the first-stage inner gear ring 3-3 is meshed with the first-stage planetary unit 3-2; the first-stage planetary carrier 3-0 and the second-stage planetary unit 4 are meshed and driven, and the first-stage inner gear ring 3-3 is always fixed;

[0039] The first-stage planetary unit 3-2 of this embodiment includes three first-stage planetary shafts 3-21 that are evenly fixed in the first-stage planetary carrier 3-0 in the circumferential direction, and the axes of the first-stage planetary shafts 3-21 are parallel to the axis of the power output shaft 1-1; a first-stage planetary gear 3-23 is coaxially sleeved on the outer circumference of any first-stage planetary shaft 3-21, and a first bearing 3-22 is provided between any first-stage planetary shaft 3-21 and the first-stage planetary gear 3-23, and each first-stage planetary gear 3-23 is meshed with the first-stage sun gear 3-10.

[0040] Among them, a plurality of first inner holes 3-01 are provided on the first-stage planetary carrier 3-0, and a second inner hole 3-02 is provided from the inner wall of any first inner hole 3-01 to the outer wall of the first-stage planetary carrier 3-0, and each first-stage planetary shaft 3-21 coaxially penetrates into each first inner hole 3-01, and penetrates into the second inner hole 3-02 by bolts to limit and fix each first-stage planetary shaft 3-21.

[0041] The secondary planetary unit 4 disclosed in this embodiment includes a secondary planetary carrier 4-0, a secondary sun gear shaft 4-1, a secondary planetary unit 4-2 and a secondary inner gear ring 4-3; the secondary sun gear shaft 4-1 is coaxially sleeved on the outer periphery of the primary sun gear shaft 3-1 located on the inner side of the primary sun gear 3-10, and the secondary sun gear shaft 4-1 and the primary sun gear shaft 3-1 do not contact, and the secondary sun gear shaft 4-1 is meshed with the primary planetary carrier 3-0; the secondary planetary carrier 4-0 is coaxially sleeved on the outer periphery of the secondary sun gear shaft 4-1, and the secondary planetary unit 4-2 is arranged on the secondary planetary carrier 4- 0, and the secondary planetary unit 4-2 is meshed with the secondary sun gear shaft 4-1; the secondary inner gear ring 4-3 is coaxially sleeved on the outer periphery of the secondary planet carrier 4-0, and the secondary inner gear ring 4-3 is meshed with the secondary planetary unit 4-2; the secondary inner gear ring 4-3 is connected to the wheel hub 0, and the two sides of the secondary planet carrier 4-0 are respectively fixedly connected to the frame 2 and the primary inner gear ring 3-3; the secondary planetary unit 4 as a whole adopts the secondary inner gear ring 4-3 floating and the secondary planet carrier 4-0 fixed, which increases the supporting rigidity of the secondary planet carrier 4-0 to the secondary planetary unit 4-2 and improves the meshing accuracy;

[0042] The secondary planetary unit 4-2 of this embodiment includes 5 secondary planetary shafts 4-21 which are evenly arranged in the circumference of the secondary planetary carrier 4-0, and the axes of the secondary planetary shafts 4-21 are parallel to the axis of the power output shaft 1-1; a secondary planetary gear 4-23 is coaxially sleeved on the outer circumference of any secondary planetary shaft 4-21, and a second bearing 4-22 is provided between any secondary planetary shaft 4-21 and the secondary planetary gear 4-23, and each secondary planetary gear 4-23 is meshed with the secondary sun gear shaft 4-1.

[0043] Among them, a plurality of third inner holes 4-01 are provided on the secondary planet carrier 4-0, and each secondary planetary wheel shaft 4-21 is inserted into the third inner hole 4-01 and installed and fixed to the secondary planet carrier 4-0.

[0044] The transmission process of the primary planetary unit 3 and the secondary planetary unit 4 is as follows:

[0045] The output power of motor 1 drives the first-stage sun gear shaft 3-1 to rotate along its axis, and the first-stage sun gear shaft 3-1 drives the first-stage sun gear 3-10 to rotate synchronously. Since the first-stage inner gear ring 3-3 is always fixed, the first-stage sun gear 3-10 gear drives each first-stage planetary gear 3-23 to rotate and revolve around it. At the same time, the revolution of each first-stage planetary gear 3-23 drives the first-stage planetary carrier 3-0 to rotate along its axis, thereby driving the second-stage sun gear shaft 4-1; since the second-stage planetary carrier 4-0 is always fixed, the second-stage sun gear shaft 4-1 rotates along its axis, drives each second-stage planetary gear 4-23 to rotate, and drives the second-stage inner gear ring 4-3 to rotate along its axis, thereby finally driving the hub 0 to rotate relative to the frame 2, and outputting a large overall torque, eliminating or reducing the deformation of the inner gear ring, canceling the torque tube, reducing the risk points of failure, improving the transmission stability and load balance, and achieving the purpose of improving the service life of the gears in both the two-stage planetary units.

[0046] In actual working conditions, the secondary planetary unit 4 is immersed in oil below the center line. Since the secondary planet carrier 4-0 is always fixed, the lubrication performance of the secondary planetary shaft 4-21, the secondary planetary gear 4-23 and the second bearing 4-22 above the oil level is poor. The actual secondary planet carrier 4-0 disclosed in this embodiment is provided with an oil collecting groove on the outside, and the secondary planetary shaft 4-21 is hollow inside. At least the inner cavity of the secondary planetary shaft 4-21 above the oil level is connected to the oil collecting groove, and the side wall of the secondary planetary shaft 4-21 is provided with a lubrication through hole 4-210 connected to its inner cavity. During the transmission process, the planetary unit rotates to throw the lubricating oil into the oil collecting tank, so that more lubricating oil is delivered to the secondary planetary unit 4-2, that is, the lubricating oil is sent from the oil collecting tank to the inner cavity of the secondary planetary shaft 4-21 above the oil surface, and is sent to the interface between the secondary planetary shaft 4-21 and the second bearing 4-22 through the lubrication through hole 4-210, which effectively improves the lubrication performance of the secondary planetary unit 4-2 and increases the service life of the secondary planetary gear 4-23 and the second bearing 4-22.

[0047] The secondary planetary gear shaft 4-21 disclosed in this embodiment is fixedly connected to the frame 2 through the third connecting shaft 9 and the pin 9-1, the secondary planetary frame 4-0 is fixedly connected to the frame 2 through the fourth connecting shaft 10, and the primary inner gear ring 3-3 and the secondary planetary frame 4-0 are fixedly connected through the first connecting shaft 5. The third connecting shaft 9 of this embodiment can be bolted, which can transmit greater torque as a whole, and reduce the probability of bolts being sheared and damaged, increase the rigidity of the system, and help improve the meshing accuracy, improve the stability of the device, and improve the transmission accuracy.

[0048] A third bearing 6 is coaxially provided between the first-stage planet carrier 3 - 0 and the second-stage planet carrier 4 - 0 disclosed in this embodiment, which improves the stability of the device as a whole and enhances the transmission accuracy.

[0049] The wheel hub 0 disclosed in this embodiment rotates relative to the frame 2 via the paired double fourth bearings 7 , and the inner ring of the fourth bearing 7 is installed and positioned via the bearing spacer 11 , the secondary planetary carrier 4 - 0 and the frame 2 .

[0050] The outer end of the wheel hub 0 disclosed in this embodiment is coaxially connected with a pressure ring 8 through a second connecting shaft 8-1, and the inner wall of the pressure ring 8 is meshed with the outer wall of the secondary inner gear ring 4-3 for transmission, and the meshing spline is axially limited by a stop ring 12. The secondary inner gear ring 4-3 is directly connected to the wheel hub through the spline to transmit torque, eliminating the torque tube, reducing large torque transmission components, improving transmission stability, and reducing the probability of failure.

[0051] The wheel hub 0 and the frame 2 disclosed in this embodiment are connected with a floating seal mechanism 13, the floating seal mechanism 13 and the first floating seal end cover and the second floating seal end cover form an output end seal, and the first floating seal end cover and the second floating seal end cover joint surface form a labyrinth seal channel. The whole makes the wheel hub 0 rotate relative to the frame 2 and seal.

[0052] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0053] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0054] In addition, the various different implementation modes disclosed in this solution may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the content invented by the present disclosure.

Claims

1. A two-stage NGW planetary structure wheel side drive device, characterized in that: It comprises a frame (2) coaxially arranged in a wheel hub (0), and a motor (1) arranged inside the frame (2), wherein a power output shaft (1-1) of the motor (1) is coaxially connected to a primary planetary unit (3), and the primary planetary unit (3) is located outside the frame (2); A secondary planetary unit (4) is coaxially arranged between the primary planetary unit (3) and the frame (2), and the primary planetary unit (3) and the secondary planetary unit (4) as well as the secondary planetary unit (4) and the wheel hub (0) are all meshed for transmission.

2. The two-stage NGW planetary structure wheel side drive device according to claim 1, characterized in that: The primary planetary unit (3) comprises a primary planet carrier (3-0), a primary sun gear shaft (3-1), a primary planetary unit (3-2) and a primary inner gear ring (3-3); The first-stage sun gear shaft (3-1) is coaxially connected to the power output shaft (1-1), the free end of the first-stage sun gear shaft (3-1) extends to the outside of the frame (2), and the outer periphery of the free end of the first-stage sun gear shaft (3-1) is provided with a first-stage sun gear (3-10); the first-stage planet carrier (3-0) is coaxially sleeved on the outer periphery of the first-stage sun gear (3-10), the first-stage planet unit (3-2) is arranged in the first-stage planet carrier (3-0), and the first-stage planet unit (3-2) is meshed with the first-stage sun gear (3-10); the first-stage inner gear ring (3-3) is coaxially sleeved on the outer periphery of the first-stage planet carrier (3-0), and the first-stage inner gear ring (3-3) is meshed with the first-stage planet unit (3-2); The first-stage planet carrier (3-0) and the second-stage planet unit (4) are meshed and transmitted, and the first-stage internal gear ring (3-3) is always fixed.

3. The two-stage NGW planetary structure wheel side drive device according to claim 1, characterized in that: The primary planetary unit (3-2) comprises a plurality of primary planetary shafts (3-21) uniformly fixed in the primary planetary carrier (3-0) in the circumferential direction, and the axis of the primary planetary shaft (3-21) is parallel to the axis of the power output shaft (1-1); A first-stage planetary gear (3-23) is coaxially sleeved on the outer periphery of any first-stage planetary shaft (3-21), a first bearing (3-22) is provided between any first-stage planetary shaft (3-21) and the first-stage planetary gear (3-23), and each first-stage planetary gear (3-23) is meshed with a first-stage sun gear (3-10).

4. The two-stage NGW planetary structure wheel side drive device according to any one of claims 2 or 3, characterized in that: The secondary planetary unit (4) comprises a secondary planet carrier (4-0), a secondary sun gear shaft (4-1), a secondary planetary unit (4-2) and a secondary inner gear ring (4-3); The secondary sun gear shaft (4-1) is coaxially sleeved on the outer periphery of the primary sun gear shaft (3-1) located on the inner side of the primary sun gear (3-10), and the secondary sun gear shaft (4-1) and the primary sun gear shaft (3-1) are not in contact, and the secondary sun gear shaft (4-1) is meshed with the primary planet carrier (3-0); the secondary planet carrier (4-0) is coaxially sleeved on the outer periphery of the secondary sun gear shaft (4-1), the secondary planet unit (4-2) is arranged in the secondary planet carrier (4-0), and the secondary planet unit (4-2) is meshed with the secondary sun gear shaft (4-1); the secondary inner gear ring (4-3) is coaxially sleeved on the outer periphery of the secondary planet carrier (4-0), and the secondary inner gear ring (4-3) is meshed with the secondary planet unit (4-2); The secondary inner gear ring (4-3) is connected to the wheel hub (0), and the two sides of the secondary planet carrier (4-0) are respectively fixedly connected to the frame (2) and the primary inner gear ring (3-3).

5. The two-stage NGW planetary structure wheel side drive device according to claim 4, characterized in that: The secondary planetary unit (4-2) comprises a plurality of secondary planetary shafts (4-21) uniformly arranged in the circumference of the secondary planetary carrier (4-0), and the axis of the secondary planetary shaft (4-21) is parallel to the axis of the power output shaft (1-1); A secondary planetary gear (4-23) is coaxially sleeved on the outer periphery of any secondary planetary gear shaft (4-21), a second bearing (4-22) is provided between any secondary planetary gear shaft (4-21) and the secondary planetary gear (4-23), and each secondary planetary gear (4-23) is meshed with the secondary sun gear shaft (4-1).

6. The two-stage NGW planetary structure wheel side drive device according to claim 5, characterized in that: An oil collecting groove is provided on the outer side of the secondary planetary carrier (4-0), the secondary planetary shaft (4-21) is hollow inside, the inner cavity of the secondary planetary shaft (4-21) is connected to the oil collecting groove, and the side wall of the secondary planetary shaft (4-21) is provided with a lubrication through hole (4-210) connected to the inner cavity thereof.

7. The two-stage NGW planetary structure wheel side drive device according to claim 6, characterized in that: The secondary planetary gear shaft (4-21) is fixedly connected to the frame (2).

8. The two-stage NGW planetary structure wheel side drive device according to claim 6, characterized in that: A third bearing (6) is coaxially arranged between the first-stage planet carrier (3-0) and the second-stage planet carrier (4-0).

9. The two-stage NGW planetary structure wheel side drive device according to claim 6, characterized in that: At least one fourth bearing (7) is coaxially arranged between the frame (2) and the wheel hub (0).

10. The two-stage NGW planetary structure wheel side drive device according to claim 6, characterized in that: The outer end of the wheel hub (0) is coaxially connected with a pressure ring (8), and the inner wall of the pressure ring (8) is meshed with the outer wall of the secondary inner gear ring (4-3) for transmission.

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