Wheel side driving assembly and assembling method therefor

Abstract

The present invention provides a wheel side driving assembly and an assembling method. The wheel side driving assembly comprises a supporting arm, a motor, a first-stage decelerator, and a second-stage decelerator; the supporting arm comprises a first surface and a second surface which are opposite, and an arm body connected between the first surface and the second surface; the motor is connected to the first surface of the supporting arm; the first-stage decelerator is located in the arm body; the second-stage decelerator is located in the arm body; the motor, the first-stage decelerator, and the second-stage decelerator are sequentially transmittingly connected; and the second-stage decelerator is located between the first-stage decelerator and the motor. The second-stage decelerator achieves power output by means of a second-stage planet carrier, the structure is more compact, and the overall axial size is shortened.

Description

Wheel drive assembly and assembly method thereof Technical Field

[0001] The present invention relates to the technical field of wheel-side drive, and in particular to a wheel-side drive assembly and an assembly method thereof. Background Art

[0002] Wheel-drive is a propulsion method for pure electric vehicles, offering advantages such as a short power transmission route, flexible layout, and a low vehicle floor. In existing wheel-drive electric vehicle structures, the motor is most commonly connected to the axle shaft via a reduction gearbox. The power transmission sequence is as follows: the motor is decelerated by the reduction gearbox and then transferred to the rear axle shaft to drive the vehicle.

[0003] For example, the drive device disclosed in publication number CN209351248U includes a wheel hub, a support arm, a reduction gearbox, and a motor. The reduction gearbox is equipped with a primary reduction gearbox and a secondary reduction gearbox. The motor sequentially transmits power to the wheel hub through the primary and secondary reduction gearboxes. The wheel hub, support arm, reduction gearbox, and motor are connected in sequence along the axial direction. This results in a large overall axial dimension, which occupies a large space.

[0004] The function of a speed reducer is to increase the driving force of a vehicle to meet or correct the force matching of the entire transmission system. For example, the wheel-side speed reducer disclosed in publication number CN110671472A includes a housing, and a primary speed reducer and a secondary speed reducer disposed within the housing. The primary speed reducer includes a primary planetary gear, and the secondary speed reducer includes a secondary planetary gear. The primary and secondary planetary gears are integrated together. During assembly, the primary and secondary planetary gears need to be assembled into the housing one by one, which increases the difficulty of assembly.

[0005] For example, the wheel-side drive device disclosed in publication number CN208439060U has a motor and support arm arranged side by side, and both are connected to the same side of the reduction gearbox. While this maintains the advantage of a smaller axial dimension, the overall contour area is increased. Furthermore, the support arm must be equipped with elastic and damping elements, which are arranged at the edge of the reduction gearbox, thus limiting the side-by-side arrangement of the motor and support arm.

[0006] Summary of the Invention

[0007] In view of this, an object of the present invention is to provide a wheel-side drive assembly with a compact structure and small space occupation.

[0008] According to one object of the present invention, the present invention provides a wheel-side drive assembly, comprising:

[0009] A support arm having a first surface and a second surface opposite to each other, and an arm body connected between the first surface and the second surface;

[0010] a motor connected to the first surface of the support arm;

[0011] A first-stage deceleration device, the first-stage deceleration device is located inside the arm body;

[0012] The secondary reduction gear is located inside the arm body, the motor, the primary reduction gear and the secondary reduction gear are sequentially connected in transmission, the secondary reduction gear is located between the primary reduction gear and the motor, and the secondary reduction gear realizes power output through the secondary planetary carrier.

[0013] As a preferred embodiment, the first-stage deceleration includes:

[0014] a primary sun gear connected to the motor;

[0015] A first-stage planet carrier, the first-stage planet carrier is sleeved on the outside of the first-stage sun gear, and the right side of the first-stage planet carrier is connected to the second-stage sun gear of the second-stage reduction;

[0016] a first-stage planetary gear, the first-stage planetary gear being rotatably disposed on the first-stage planetary carrier, the first-stage planetary gear being meshed with the first-stage sun gear;

[0017] A primary ring gear is arranged around the outer periphery of the primary planet carrier and is meshed with the primary planet gear.

[0018] As a preferred embodiment, the first-stage planet carrier includes:

[0019] Level 1 left side plate;

[0020] A first-level right plate, wherein the first-level planetary gear is rotatably arranged between the first-level right plate and the first-level left plate;

[0021] A primary right tube, the primary right tube being connected to the inner ring of the primary right side plate, the primary right tube being provided with a secondary sun gear of the secondary reduction gear, the secondary sun gear being meshed with the secondary planetary gear;

[0022] A first-level left tube is connected to the inner ring of the first-level left plate, a bearing is provided between the first-level left tube and the second-level second frame of the second-level planetary frame, and a bearing is provided between the first-level right tube and the second-level left plate.

[0023] As a preferred embodiment, the secondary reduction includes:

[0024] a secondary planetary carrier, one end of which is connected to the half shaft, and the other end of which is rotatably connected to the motor;

[0025] A secondary planetary gear, the secondary planetary gear being rotatably disposed on the secondary planetary carrier;

[0026] a secondary ring gear, the secondary ring gear being wound around the outer circumference of the secondary planet carrier and fixed to the inner wall of the arm body, the secondary ring gear being meshed with the secondary planet gear;

[0027] The secondary sun gear is meshed with the secondary planet gear.

[0028] As a preferred embodiment, the secondary planetary gear includes a secondary first gear and a secondary second gear, the secondary first gear and the secondary second gear are axially and integrally connected, the secondary first gear is meshed with the secondary sun gear, the secondary second gear is meshed with the secondary ring gear, and the diameter of the secondary first gear is greater than the diameter of the first gear.

[0029] As a preferred embodiment, the secondary planet carrier includes:

[0030] a secondary first frame, on which the secondary planetary gear is rotatably mounted;

[0031] The left side of the secondary second frame is connected to the half shaft, the right side of the secondary second frame is connected to the secondary first frame, and the primary gear ring is axially limited between the secondary first frame and the secondary second frame.

[0032] As a preferred embodiment, the secondary first frame includes:

[0033] Secondary left side panel;

[0034] A secondary right side plate, wherein the secondary planetary gear is rotatably arranged between the secondary right side plate and the secondary left side plate;

[0035] A secondary right tube, the secondary right tube being connected to the inner ring of the secondary right side plate, and a bearing being provided between the secondary right tube and the motor;

[0036] The secondary left tube is connected to the outer ring of the secondary left side plate, and the primary speed reducer is located inside the secondary left tube.

[0037] As a preferred embodiment, the secondary second frame includes:

[0038] a secondary second left tube, wherein a bearing is provided between the secondary second left tube and the support arm;

[0039] The secondary second disc is connected to the secondary second left tube, and the primary gear ring is axially limited between the secondary second disc and the secondary left tube.

[0040] As a preferred embodiment, the first-stage planetary gear is arranged on the first-stage planetary carrier via the first-stage wheel shaft; the second-stage planetary gear is arranged on the second-stage planetary carrier via the second-stage wheel shaft;

[0041] The first-stage planetary gear is located on the axial side of the second-stage planetary gear, a first-stage oil passage is opened on the side of the first-stage wheel shaft facing the second-stage planetary gear, the first-stage oil passage is communicated between the first-stage planetary gear and the first-stage wheel shaft, and a second-stage oil passage is opened on the side of the second-stage wheel shaft facing the first-stage planetary gear, the second-stage oil passage is communicated between the second-stage planetary gear and the second-stage wheel shaft.

[0042] As a preferred embodiment, it also includes:

[0043] A reduction shaft is connected to the motor, the reduction shaft passes through the first-stage planetary carrier and the second-stage planetary carrier in sequence, the first-stage planetary carrier and the second-stage planetary carrier are respectively rotatably connected to the reduction shaft, and the first-stage sun gear is connected to the outer wall of the reduction shaft.

[0044] As a preferred embodiment, the secondary planetary gear includes a secondary first gear and a secondary second gear, the secondary first gear and the secondary second gear are axially and integrally connected, the secondary first gear is engaged with the secondary sun gear, and the secondary second gear is engaged with the secondary ring gear.

[0045] As a preferred embodiment, the support arm includes a mounting base, and the mounting base includes:

[0046] a first shell;

[0047] a second housing, one side of the second housing being connected to the first housing, the other side of the second housing being used for connecting to a driving device, and the circumferential dimension of the second housing being larger than the circumferential dimension of the first housing;

[0048] The interior of the first housing and the interior of the second housing are communicated with each other to form a stepped hole, and the stepped hole is used to accommodate the reduction assembly.

[0049] The primary reduction gear is arranged inside the first housing, and the secondary reduction gear is arranged inside the second housing.

[0050] A method for assembling a wheel-side drive assembly comprises the following steps:

[0051] Providing a support arm, the support arm having a first surface and a second surface opposite to each other, and an arm body connecting the first surface and the second surface;

[0052] Connect the secondary reduction gear between the primary reduction gear and the motor;

[0053] The primary reduction gear and the secondary reduction gear are inserted into the arm body from the first surface of the support arm, and the motor is connected to the first surface, and the secondary reduction gear realizes power output through the secondary planetary carrier.

[0054] Compared with the existing technology, this technical solution has the following advantages:

[0055] By opening the assembly through hole on the support arm and arranging the first-stage reduction gear and the second-stage reduction gear inside the arm body of the support arm, the space is fully utilized, the structure is more compact, the overall axial dimension is shortened, and the strength of the wheel-side drive assembly is also improved.

[0056] The first-stage reduction gear, the second-stage reduction gear and the motor are arranged axially according to the size of their respective circumferential dimensions, with the first-stage reduction gear having a smaller circumferential dimension placed on the outside, and the second-stage reduction gear having a larger circumferential dimension placed between the motor and the first-stage reduction gear. This arrangement does not interfere with the airbags and the like arranged at the edge of the support arm contour, and the arrangement is novel, fully utilizing the mechanism space and further reducing the occupied space.

[0057] The first-stage reduction gear is located inside the second-stage reduction gear, has a compact structure, and reduces the occupied space. The first-stage ring gear of the first-stage reduction gear is fixed to the second-stage planetary carrier, that is, the first-stage ring gear rotates together with the second-stage planetary carrier, and the left side of the second-stage planetary carrier is connected to the wheel hub through a half shaft, which relatively reduces the actual rotation speed and further extends the service life of the bearing.

[0058] The first-stage reduction gear and the second-stage reduction gear are jointly arranged inside the support arm, that is, the two share a cavity, and the first-stage planetary gear and the second-stage planetary gear can jointly stir the lubricating oil in the support arm to perform integrated lubrication, wherein the first-stage planetary gear can throw the lubricating oil onto the second-stage planetary gear, thereby improving the lubrication effect and ensuring operational reliability.

[0059] At the same time, lubricating oil can enter the primary oil channel and the secondary oil channel to lubricate the bearings between the primary planetary gear and the primary connecting shaft, and between the secondary planetary gear and the secondary connecting shaft, further improving the lubrication effect.

[0060] The present invention is further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] FIG1 is a cross-sectional view of the wheel drive assembly of the present invention;

[0062] FIG2 is a partial cross-sectional view of the wheel drive assembly of the present invention;

[0063] FIG3 is a perspective view of the wheel side drive assembly of the present invention;

[0064] FIG4 is a perspective view of the first-stage reduction gear of the present invention;

[0065] FIG5 is a cross-sectional view of the first-stage reduction gear of the present invention;

[0066] FIG6 is a perspective view of the two-stage reduction gear of the present invention;

[0067] FIG7 is a cross-sectional view of the two-stage reduction gearbox according to the present invention;

[0068] FIG8 is a schematic diagram of the second-stage first frame according to the present invention in one direction;

[0069] FIG9 is a schematic diagram of the second-stage first frame according to the present invention from another direction;

[0070] FIG10 is a perspective view of the second secondary frame of the present invention;

[0071] FIG11 is a perspective view of the support arm of the present invention;

[0072] FIG12 is a cross-sectional view of the support arm according to the present invention. DETAILED DESCRIPTION

[0073] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0074] First embodiment

[0075] As shown in Figures 1 and 2, the wheel drive assembly includes:

[0076] A support arm 100, wherein the support arm 100 has a first surface 100a and a second surface 100b opposite to each other, and an arm body 100d extending between the first surface 100a and the second surface 100b;

[0077] a motor 200 connected to the first surface 100a of the support arm 100;

[0078] The primary reduction gear 300 and the secondary reduction gear 40 are respectively located inside the arm body 100d, and the motor 200, the primary reduction gear 300 and the secondary reduction gear 400 are sequentially connected in transmission. The secondary reduction gear 400 is located between the primary reduction gear 300 and the motor 200, and the secondary reduction gear 400 realizes power output through the secondary planetary carrier 410.

[0079] By arranging the primary reduction gear 300 and the secondary reduction gear 400 within the arm body 100d of the support arm 100, the structure becomes more compact and the overall axial dimension is shortened. Furthermore, the primary reduction gear 300, the secondary reduction gear 400, and the motor 200 are arranged axially according to their respective circumferential dimensions, with the primary reduction gear 300 (with a smaller circumferential dimension) positioned on the outside and the secondary reduction gear 400 (with a larger circumferential dimension) positioned between the motor 200 and the primary reduction gear 300. This prevents the circumferential dimensions from increasing and prevents interference with the airbag 600 and other components positioned at the edge of the support arm 100. This novel arrangement fully utilizes the mechanical space and further reduces the occupied space.

[0080] The first-stage reduction gear 300 and the second-stage reduction gear 400 are split structures. When assembled to form the reduction gear structure, the first-stage planetary carrier 310 is directly inserted into the second-stage planetary carrier 410 and connected to the second-stage sun gear 440. The structure is simple and the assembly efficiency is improved.

[0081] As shown in Figures 2, 11 and 12, the support arm 100 includes an upper arm 120 and a lower arm 130. The upper arm 120 and the lower arm 130 are respectively connected to the upper and lower sides of the outer wall of the arm body 100d, and are used to connect a swing arm, a shock absorber or an airbag 600, etc.

[0082] The arm body 100d has a first surface 100a and a second surface 100b on both sides in the axial direction. The arm body 100d includes a first arm body 100d1 and a second arm body 100d2. The first arm body 100d1 is connected between the first surface 100a and the second arm body 100d2, and the second arm body 100d2 is connected between the first arm body 100d1 and the second surface 100b.

[0083] The circumferential size of the first arm body 100d1 is larger than the circumferential size of the second arm body 100d2. The second-stage reduction gear 400 is disposed in the first arm body 100d1, and the first-stage reduction gear 300 is disposed in the second arm body 100d2.

[0084] For a two-stage reduction mechanism, the circumferential dimension of the primary reduction is typically smaller than that of the secondary reduction. If the motor, primary reduction, and secondary reduction are arranged sequentially along the power transmission path, the circumferential dimension of the secondary reduction at the end is smaller than that of the primary reduction, which is not conducive to reducing the axial dimension of the wheel-side drive assembly. In this embodiment, the primary reduction 300, which has a smaller circumferential dimension, is positioned on the outside, and the secondary reduction 400, which has a larger circumferential dimension, is positioned between the motor 200 and the primary reduction 300. This allows the secondary reduction mechanism to be positioned deeper within the arm body 100d of the support arm 100, effectively avoiding the aforementioned drawbacks and further reducing the axial dimension of the wheel-side drive assembly.

[0085] As shown in Figure 12, the arm body 100d also includes an intermediate arm body 100d3, which is connected between the first arm body 100d1 and the second arm body 100d2, wherein the first arm body 100d1 and the second arm body 100d2 are both cylindrical, and the intermediate arm body 100d3 is conical. Since the circumferential size of the first arm body 100d1 is larger than that of the second arm body 100d2, the arm body 100d has a stepped structure.

[0086] Referring to Figure 1 , the airbag 600 is arranged obliquely at the edge of the arm 100d, with the right side of the airbag 600 at a higher level than the left side. This prevents the arm 100d from interfering with the arrangement of the airbag 600 while providing ample internal space to accommodate the primary reduction gear 300 and the secondary reduction gear 400. As shown in Figure 2 , the primary reduction gear 300 is positioned within the secondary planetary carrier 410, resulting in a more compact structure. The primary ring gear 300 of the primary reduction gear 300 is secured to the inner wall of the secondary planetary carrier 410, extending the service life of the bearings.

[0087] As shown in FIG2 , the primary reduction gear 300 is located in the second arm body 100d2 of the support arm 100 and is disposed close to the second surface 100b relative to the motor 200. The primary reduction gear 300 includes:

[0088] A primary sun gear 340 , wherein the primary sun gear 340 is connected to the motor 200 ;

[0089] A primary planet carrier 310, which is sleeved on the outside of the primary sun gear 340, and the right side of the primary planet carrier 310 is connected to the secondary sun gear 440 of the secondary reduction gear 400;

[0090] The first-stage planetary gear 320 is rotatably mounted on the first-stage planet carrier 310 . The first-stage planetary gear 320 is meshed with the first-stage sun gear 340 . The first-stage planetary gear 320 may have a helical gear structure.

[0091] The primary ring gear 330 is wound around the outer circumference of the primary planet carrier 310 and fixed to the inner wall of the secondary planet carrier 410 . The primary ring gear 330 is engaged with the primary planet gear 320 .

[0092] The motor shaft of the motor 200 is connected to the reduction shaft 500, which passes through the primary reduction gear 300 and the secondary reduction gear 400. The primary sun gear 340 can be integrally or detachably connected to the reduction shaft 500. The primary planet carrier 310 is rotatably mounted on the outer wall of the reduction shaft 500, so that the reduction shaft 500 drives the primary sun gear 340 to rotate. The primary planet gears 320 are engaged between the primary sun gear 340 and the primary ring gear 330. Since both the primary sun gear 340 and the primary ring gear 330 are rotatable, and the primary planet gears 320 are rotatably mounted on the primary planet carrier 310, they drive the primary planet carrier 310 to rotate, so that the primary planet carrier 310 transmits power through the output end on the right side.

[0093] As shown in Figures 4 and 5 , the primary planet carrier 310 includes a primary left plate 311, a primary right plate 312, a primary outer plate 313, and a primary connecting shaft 314. The primary outer plate 313 is connected to the outer rings of the primary left plate 311 and the primary right plate 312, respectively. The primary connecting shaft 314 is connected between the primary left plate 311 and the primary right plate 312. There may be three primary connecting shafts 314, spaced apart circumferentially. Each primary connecting shaft 314 is sleeved with a primary planet gear 320. The primary planet gear 320 is held between the primary left plate 311 and the primary right plate 312. The primary outer plate 313 is provided with a primary notch 313a to expose the primary planet gear 320 and engage with the primary ring gear 330. A primary bearing 316 may be disposed between the primary connecting shaft 314 and the primary planet gear 320.

[0094] 5 , the first-level connecting shaft 314 can be inserted into the first-level left plate 311 and the first-level right plate 312, and the right end face of the first-level connecting shaft 314 can be exposed on the first-level right plate 312. A first-level oil channel 314a can be opened on the right end face of the first-level connecting shaft 314, and a first-level hole 314b is opened on the inner wall of the first-level oil channel 314a. The lubricating oil can enter the first-level oil channel 314a from the right end face of the first-level connecting shaft 314, and then pass through the first-level hole 314b to lubricate the first-level bearing 316 between the first-level connecting shaft 314 and the first-level planetary gear 320, thereby improving lubricity and ensuring operational reliability.

[0095] The first-stage planet carrier 310 further includes a first-stage right tube 315 , which is connected to the inner ring of the first-stage right plate 312 . The first-stage right tube 315 serves as an output end of the first-stage reduction gear 300 .

[0096] As shown in Figures 2 and 7, the first-stage planetary carrier 310 also includes a first-stage left tube 317, which is connected to the inner ring of the first-stage left plate 311. The reduction shaft 500 passes through the first-stage right tube 315 and the first-stage left tube 317. A first bearing 710 can be arranged between the reduction shaft 500 and the first-stage left tube 317. The first bearing 710 can be a double-row tapered roller bearing to enable the first-stage planetary carrier 310 to rotate relative to the reduction shaft 500.

[0097] As shown in FIG2 , the secondary reduction gear 400 includes:

[0098] A secondary planetary carrier 410, one end of which is connected to the half shaft, and the other end of which is rotatably connected to the motor 200;

[0099] A secondary planetary gear 420 rotatably mounted on the secondary planetary carrier 410 ;

[0100] A secondary ring gear 430, which is wound around the outer circumference of the secondary planet carrier 410 and fixed to the inner wall of the arm 100d, and is engaged with the secondary planet gear 420;

[0101] The secondary sun gear 440 is connected to the right side of the primary planet carrier 310 of the primary reduction gear 300 , and the secondary sun gear 440 is meshed with the secondary planet gear 420 .

[0102] The primary planetary carrier 310 drives the secondary sun gear 440 to rotate, and the secondary planetary gear 420 is engaged between the secondary sun gear 440 and the secondary ring gear 430, wherein the secondary ring gear 430 is fixed, so the secondary planetary gear 420 rotates under the action of the secondary sun gear 440 and the secondary ring gear 430, so that the left end of the secondary planetary carrier 410 outputs power, that is, drives the half shaft to rotate.

[0103] Referring to Figure 2, a motor flange 210 is provided on the left side of the motor 200. The motor flange 210 is annular and abuts against the first surface 100a of the support arm 100. The secondary ring gear 430 can be fixed on the inner wall of the motor flange 210, for example, by using a spline structure, so that the secondary ring gear 430 is inserted and fixed on the inner wall of the motor flange 210 from the left side of the motor 200.

[0104] 2 and 4 , the secondary sun gear 440 can be integrally or detachably connected to the primary right tube 315 of the primary planet carrier 310. For example, a spline groove 315a can be defined on the outer wall of the primary right tube 315. The secondary sun gear 440 is inserted into the primary right tube 315 from right to left using the spline groove 315a and then secured with bolts.

[0105] As shown in FIG. 2 and FIG. 6 to FIG. 9 , the secondary planet carrier 410 includes:

[0106] A secondary first frame 411 , on which the secondary planetary gear 420 is rotatably mounted;

[0107] The secondary second frame 412 has a left side connected to the half shaft, a right side connected to the secondary first frame 411, and the primary ring gear 330 is axially limited between the secondary first frame 411 and the secondary second frame 412.

[0108] As shown in Figures 6 to 9, the secondary first frame 411 includes a secondary left plate 411a, a secondary right plate 411b, a secondary outer plate 411c and a secondary connecting shaft 411d. The secondary outer plate 411c is respectively connected to the outer rings of the secondary left plate 411a and the secondary right plate 411b. The secondary connecting shaft 411d is connected between the secondary left plate 411a and the secondary right plate 411b. The number of the secondary connecting shafts 411d can also be three, and they are arranged at intervals on a circle. Each of the secondary connecting shafts 411d is respectively sleeved with one of the secondary planetary gears 420. A secondary bearing 411g is provided between the secondary connecting shaft 411d and the secondary planetary gear 420. The secondary planetary gear 420 is retained between the secondary left plate 411a and the secondary right plate 411b. A secondary notch 411c1 is opened on the secondary outer plate 411c to allow the secondary planetary gear 420 to be exposed and engage with the secondary ring gear 430.

[0109] Referring to Figure 7, the secondary connecting shaft 411d is inserted into the secondary left plate 411a and the secondary right plate 411b, and the right end face of the secondary connecting shaft 411d is exposed on the secondary right plate 411b. At this time, a secondary oil channel 411d1 can be opened on the right end face of the secondary connecting shaft 411d, and a secondary hole 411d2 is opened on the inner wall of the secondary oil channel 411d1. Lubricating oil can enter the secondary oil channel 411d1 from the right end face of the secondary connecting shaft 411d, and then pass through the secondary hole 411d2 to lubricate the secondary bearing 411g between the secondary connecting shaft 411d and the secondary planetary gear 420.

[0110] As shown in Figures 2, 7, and 8, the secondary first frame 411 further includes a secondary right tube 411e, which is connected to the inner ring of the secondary right side plate 411b and inserted into the housing of the motor 200. A second bearing 720 is disposed between the secondary right tube 411e and the housing of the motor 200. The secondary right tube 411e is sleeved onto the exterior of the reduction shaft 500, with a third bearing 730 disposed therebetween to enhance structural reliability and ensure smooth rotation.

[0111] As shown in Figures 2 and 7 , the secondary first carrier 411 also includes a secondary left tube 411f, which is connected to the outer ring of the secondary left plate 411a. The primary reducer 300 can be accommodated within the secondary left tube 411f, making the structure more compact. The primary right tube 315 of the primary planetary carrier 310 passes through the inner ring of the secondary left plate 411a and extends into the interior of the secondary outer plate 411c. The secondary sun gear 440 is sleeved on the primary right tube 315 to mesh with the secondary planetary gears 420. A fourth bearing 740 is disposed between the primary right tube 315 and the secondary left plate 411a.

[0112] As shown in Figures 2, 6 and 7, the secondary planetary gear 420 is a double-wheel gear, including a secondary first gear 421 and a secondary second gear 422. The secondary first gear 421 and the secondary second gear 422 are axially and integrally connected. The secondary first gear 421 is engaged with the secondary sun gear 440, and the secondary second gear 422 is engaged with the secondary ring gear 430.

[0113] The secondary first gear 421 and the secondary second gear 422 are arranged from left to right. The circumferential size of the secondary first gear 421 is larger than the circumferential size of the secondary second gear 422. The secondary first gear 421 and the secondary second gear 422 can adopt a helical gear structure.

[0114] As shown in Figures 2, 7, and 10, the secondary second frame 412 includes a secondary second left tube 412a and a secondary second disc 412b. The secondary second left tube 412a is connected to the inner ring of the secondary second disc 412b, while the secondary second disc 412b is connected to the left side of the secondary left tube 411f and can be secured via bolts or the like. The secondary second left tube 412a can extend from the second surface 100b of the support arm 100 or be positioned within the arm body 100d, serving as a power output and connecting the axles. Referring to Figure 2, a fifth bearing 750 can be disposed between the secondary second left tube 412a and the support arm 100. This fifth bearing 750 can be a double-row tapered roller bearing.

[0115] As shown in Figures 2, 6 and 7, a secondary step 411f2 is provided on the inner wall of the secondary left tube 411f, and a clamping groove 411f1 is also provided on the inner wall of the secondary left tube 411f. The clamping groove 411f1 extends from the secondary step 411f2 to the left end face of the secondary left tube 411f. A second disc snap ring 412c is provided on the right end face of the secondary second disc 412b, wherein the outer diameter of the secondary second disc 412b is larger than that of the second disc snap ring 412c. A gear ring snap ring is provided on the outer ring of the primary ring gear 330, which fits into the retaining groove 411f1. The primary ring gear 330 is inserted from the left end face of the secondary left tube 411f and arranged within the secondary left tube 411f. The second disc snap ring 412c is then inserted into the retaining groove 411f1 until it abuts the left end face of the secondary left tube 411f, thereby axially constraining the primary ring gear 330 between the second disc snap ring 412c and the secondary step 411f2. It can be seen that the secondary planet carrier 410 is a split structure, facilitating overall assembly.

[0116] As shown in Figure 2, the first-stage reduction gear 300 and the second-stage reduction gear 400 are jointly accommodated in the arm body 100d of the support arm 100, wherein the first-stage reduction gear 300 is arranged inside the second-stage reduction gear 400, so that it can be lubricated as a whole, wherein two oil seals 810 are provided on both axial sides of the support arm 100, one oil seal 810 is located between the support arm 100 and the second-stage second left tube 412a of the second-stage second frame 412, and the other oil seal 810 is located between the reduction shaft 500 and the housing of the motor 200, and the first-stage reduction gear 300 and the second-stage reduction gear 400 are lubricated as a whole by rotating the first-stage planetary gear 320 and the second-stage planetary gear 420, and at the same time enter the first-stage oil channel 314a and the second-stage oil channel 411d1 to lubricate the bearings.

[0117] As shown in FIG1 and FIG2 , the motor 200 is an axial flux motor, which has the advantages of small axial size, high efficiency, high power density, etc. Therefore, the axial flux motor is used to further reduce the overall axial size.

[0118] As shown in Figures 1 and 3, the wheel-side drive assembly further includes a half-axle sleeve 830, a brake disc 840, and a caliper 850. The half-axle sleeve 830 is connected to the second surface 100b of the support arm 100, and the half-axle is arranged inside the half-axle sleeve 830. The brake disc 840 and the caliper 850 are arranged at the edge of the half-axle sleeve 830.

[0119] Bearings are provided at both axial ends of the secondary planetary carrier and between the support arm and the motor. Compared with the prior art in which bearings are only installed on the hub side, the rotation is smoother and the bearing load is prevented from being too heavy and affecting the service life.

[0120] Second embodiment

[0121] As shown in FIG. 2 , the primary planet carrier 310 of the wheel-side drive assembly is inserted into the secondary planet carrier 410 , and the primary planet carrier 310 is connected to the secondary sun gear 440 .

[0122] The first-stage reduction gear 300 and the second-stage reduction gear 400 are split structures. When assembled to form the reduction gear structure, the first-stage planetary carrier 310 is directly inserted into the second-stage planetary carrier 410 and connected to the second-stage sun gear 440. The structure is simple and the assembly efficiency is improved.

[0123] As shown in Figure 2, the first-stage sun gear 340 can be integrally or detachably connected to the reduction shaft 500, and the first-stage planetary carrier 310 is rotatably set on the outer wall of the reduction shaft 500, so that the reduction shaft 500 drives the first-stage sun gear 340 to rotate, and the first-stage planetary gear 320 is engaged between the first-stage sun gear 340 and the first-stage ring gear 330. Since the first-stage sun gear 340 and the first-stage ring gear 330 are both rotating, and the first-stage planetary gear 320 is rotatably set on the first-stage planetary carrier 310, it drives the first-stage planetary carrier 310 to rotate, so that the first-stage planetary carrier 310 is transmitted and output through the output end on the right.

[0124] The primary planetary carrier 310 drives the secondary sun gear 440 to rotate, and the secondary planetary gear 420 is engaged between the secondary sun gear 440 and the secondary ring gear 430, wherein the secondary ring gear 430 is fixed, so the secondary planetary gear 420 rotates under the action of the secondary sun gear 440 and the secondary ring gear 430, so that the left end of the secondary planetary carrier 410 performs transmission output.

[0125] In summary, the first-stage reduction gear 300 and the second-stage reduction gear 400 are split structures. When assembled to form the reduction gear structure, the first-stage planetary carrier 310 is directly inserted into the second-stage planetary carrier 410 and connected to the second-stage sun gear 440. The structure is simple and the assembly efficiency is improved.

[0126] Third embodiment

[0127] 2 , the reduction structure of the third embodiment is based on the first embodiment, wherein the first-stage planetary gear 320 is located on the axial side of the second-stage planetary gear 420, the first-stage connecting shaft 314 is provided with a first-stage oil passage 314a on the side facing the second-stage planetary gear 420, and the first-stage oil passage 314a is connected between the first-stage planetary gear 320 and the first-stage connecting shaft 314, and the second-stage connecting shaft 411d is provided with a second-stage oil passage 411d1 on the side facing the first-stage planetary gear 320, and the second-stage oil passage 411d1 is connected between the second-stage planetary gear 420 and the second-stage connecting shaft 411d.

[0128] The primary reduction gear 300 and the secondary reduction gear 400 are co-located within the support arm 100, i.e., they share a common cavity. Furthermore, the primary planetary gear 320 and the secondary planetary gear 420 can jointly agitate the lubricating oil within the support arm 100 for integrated lubrication. The primary planetary gear 320 can throw the lubricating oil onto the secondary planetary gear 420, thereby improving lubrication and ensuring operational reliability. Simultaneously, the lubricating oil can enter the primary oil passage 314a and the secondary oil passage 411d1 to lubricate the bearings between the primary planetary gear 320 and the primary connecting shaft 314, and between the secondary planetary gear 420 and the secondary connecting shaft 411d, further improving lubrication.

[0129] As shown in Figure 2, the first-stage reduction gear 300 and the second-stage reduction gear 400 are jointly accommodated in the arm body 100d of the support arm 100, wherein the first-stage reduction gear 300 is arranged inside the second-stage reduction gear 400, so that it can be lubricated as a whole, wherein two oil seals 810 are provided on both axial sides of the support arm 100, one oil seal 810 is located between the support arm 100 and the second-stage second left tube 412a of the second-stage second frame 412, and the other oil seal 810 is located between the reduction shaft 500 and the housing of the motor 200, and the first-stage reduction gear 300 and the second-stage reduction gear 400 are lubricated as a whole by rotating the first-stage planetary gear 320 and the second-stage planetary gear 420, and at the same time enter the first-stage oil channel 314a and the second-stage oil channel 411d1 to lubricate the bearings.

[0130] Referring to FIG2 , the working principle of the deceleration structure is as follows:

[0131] The motor 200 drives the reduction shaft 500 to rotate, and the reduction shaft 500 drives the primary sun gear 340 to rotate. Since the primary planetary gear 320 is engaged between the primary sun gear 340 and the primary ring gear 330, and both the primary sun gear 340 and the primary ring gear 330 are rotating, and the primary planetary gear 320 is rotatably arranged on the primary planet carrier 310, the primary planet carrier 310 rotates under the action of the primary sun gear 340 and the primary ring gear 330.

[0132] The primary planetary carrier 310 drives the secondary sun gear 440 to rotate. Since the secondary planetary gear 420 is engaged between the secondary sun gear 440 and the secondary ring gear 430, and the secondary ring gear 430 is fixed, the secondary planetary gear 420 rotates under the action of the secondary sun gear 440 and the secondary ring gear 430, so that the left end of the secondary planetary carrier 410 drives the half shaft to rotate.

[0133] Fourth embodiment

[0134] As shown in FIG11 and FIG12 , the deceleration structure of the fourth embodiment is based on the first embodiment, wherein the support arm 100 includes a mounting base 110 , and the mounting base 110 includes:

[0135] a first housing 111;

[0136] a second housing 112, one side of the second housing 112 being connected to the first housing 111, and the other side of the second housing 112 being used for connecting to the drive device 200, wherein the circumferential dimension of the second housing 112 is greater than the circumferential dimension of the first housing 111;

[0137] The interior of the first housing 111 and the interior of the second housing 112 are connected to form a stepped hole 1000 . The stepped hole 1000 is used to accommodate the primary reduction gear 300 and the secondary reduction gear 400 .

[0138] The mounting seat 110 is composed of a first shell 111 and a second shell 112 with different circumferential sizes, and a step hole 1000 is formed inside the first shell 111 and the second shell 112, so that the first reduction gear 300 and the second reduction gear 400 can be accommodated in the step hole 1000, reducing the axial size and the occupied space, and also allowing the first reduction gear 300 and the second reduction gear 400 to be reasonably arranged using the step hole 1000, for example, the second reduction gear 400 with a larger circumferential size can be accommodated inside the second shell 112, and the first reduction gear 300 with a smaller circumferential size can be accommodated inside the first shell 111, see Figure 3.

[0139] As shown in FIG2 and FIG12, the stepped hole 1000 includes:

[0140] A first hole 1001, the first hole 1001 axially passing through the first shell 111;

[0141] The second hole 1002 axially penetrates the second shell 112 . The diameter of the second hole 1002 is greater than that of the first hole 1001 . The second hole 1002 is connected to the first hole 1001 .

[0142] The first hole 1001 is surrounded by the inner wall of the first shell 111. Since the first hole 1001 penetrates the first shell 111 axially, the first hole 1001 is connected with the second hole 1102 on the right side of the first shell 111. The secondary planetary carrier 410 of the secondary reduction gear 400 passes through the first hole 1001 and is connected to the half shaft.

[0143] Similarly, the second hole 1002 is surrounded by the inner wall of the second shell 112. Since the second hole 1002 penetrates the second shell 112 axially, the second hole 1002 is connected to the first hole 1001 on the left side of the second shell 111, and the right side of the second shell 112 is connected to the motor 200.

[0144] As shown in FIG2 and FIG12 , the first hole 1001 includes:

[0145] First outer hole 1001a;

[0146] The first inner hole 1001b is connected between the first outer hole 1001a and the second hole 1002. The diameter of the first inner hole 1001b is larger than the diameter of the first outer hole 1001a. A bearing is placed in the first outer hole 1001a. A first-stage speed reducer 300 is set in the first inner hole 1001b.

[0147] The first hole 1001 is also in the shape of a stepped hole, and a bearing is placed in the first outer hole 1001a with a smaller diameter. The bearing is located between the secondary planetary carrier 410 of the secondary reduction 400 and the inner wall of the first outer hole 1001a, while the first inner hole 1001b with a larger diameter houses the first reduction 300.

[0148] As shown in FIG11 and FIG12 , the mounting base 110 further includes:

[0149] The intermediate shell 113 is connected between the first shell 111 and the second shell 112 . The circumferential dimension of the intermediate shell 113 gradually increases from the first shell 111 to the second shell 112 .

[0150] The stepped hole 1000 further includes a middle hole 1003 , which is surrounded by the middle shell 113 . The middle hole 113 is connected between the first hole 1001 and the second hole 1002 , and the diameter of the middle hole 1003 gradually increases from the first hole 1001 to the second hole 1002 .

[0151] As shown in FIG. 12 , the axial dimensions of the first shell 111 , the second shell 112 and the intermediate shell 113 gradually decrease and can also be adjusted according to design requirements.

[0152] As shown in Figures 11 and 12, the support arm 100 also includes an upper arm 120 and a lower arm 130, and the upper arm 120 and the lower arm 130 are connected to the outer wall of the mounting seat 110, wherein the upper arm 120 is located above the mounting seat 110, and the lower arm 130 is located below the lower arm 130, and is used to connect shock absorbers, air springs, brackets, etc., and reference can be made to the wheel-side motor-driven passenger car independent suspension disclosed in CN109435612A.

[0153] Referring to Figures 11 and 12, the upper arm 120 includes an upper sleeve 121, a first upper connecting plate 122 and a second upper connecting plate 123. The first upper connecting plate 122 is connected between the first shell 111 and the upper sleeve 121, and the second upper connecting plate 123 is connected between the second shell 112 and the upper sleeve 121. The upper sleeve 121 and the mounting base 110 are perpendicular to each other.

[0154] The upper center hole 121a of the upper sleeve 121 is used to connect to the upper arm, and the central axis of the upper center hole 121a is perpendicular to the central axis of the mounting base 110. Several upper intermediate plates 124 are connected between the first upper connecting plate 122 and the second upper connecting plate 123. Lightening holes are provided between adjacent upper intermediate plates 124 to reduce the weight of the upper arm 120.

[0155] As shown in Figures 11 and 12, the lower arm 130 includes a lower sleeve 131 and a lower connecting plate 132. The lower sleeve 131 is connected to the outer wall of the intermediate shell 113 of the mounting seat 110, and the lower connecting plate 132 is connected between the lower sleeve 131 and the first shell 111. The lower sleeve 131 and the mounting seat 110 are perpendicular to each other.

[0156] The lower center hole 131 a of the lower sleeve 131 is used to connect the lower arm, and the center axis of the lower center hole 131 a is perpendicular to the center axis of the mounting seat 110 .

[0157] To sum up, the mounting seat 110 is composed of a first shell 111 and a second shell 112 with different circumferential sizes, and a step hole 1000 is formed inside the first shell 111 and the second shell 112, so that the first reduction gear 300 and the second reduction gear 400 can be accommodated in the step hole 1000, reducing the axial size and the occupied space, and also allowing the first reduction gear 300 and the second reduction gear 400 to be reasonably arranged using the step hole 1000, for example, the second reduction gear 400 with a larger circumferential size can be accommodated inside the second shell 112, and the first reduction gear 300 with a smaller circumferential size can be accommodated inside the first shell 111.

[0158] Fifth embodiment

[0159] As shown in Figures 2, 5 and 7, the assembly method of the wheel drive assembly is as follows:

[0160] S100, providing a support arm 100, wherein the support arm 100 has a first surface 100a and a second surface 100b opposite to each other, and an arm body 100d connecting the first surface 100a and the second surface 100b;

[0161] S200, connecting the secondary reduction gear 400 between the primary reduction gear 300 and the motor 200;

[0162] S300, insert the primary reduction gear 300 and the secondary reduction gear 400 into the arm body 100d from the first surface 100a of the support arm 100, and connect the motor 200 to the first surface 100a, and the secondary reduction gear 400 realizes power output through the secondary planetary carrier 410.

[0163] The motor shaft of the motor 200 is connected to the reduction shaft 500. The secondary planetary carrier 410 of the secondary reduction 400 includes a secondary first carrier 411 and a secondary second carrier 412 connected to each other. Then, step S200 includes:

[0164] S210, move the secondary ring gear 430 from the left side of the motor 200 and insert it into the inner wall of the motor flange 210 of the motor 200, and at the same time, rotate the secondary first frame 411 on which the secondary planetary gear 420 is provided and sleeved on the reduction shaft 500 from the left side of the reduction shaft 500, and make the rotating secondary planetary gear 420 on the secondary first frame 411 engage with the secondary ring gear 430, and make the secondary right tube 411e of the secondary first frame 411 rotatably connected to the motor 200.

[0165] S220, the first-stage planetary carrier 310 on which the first-stage planetary gear 320 is rotated is sleeved on the reduction shaft 500 from the left side of the reduction shaft 500, and is accommodated in the second-stage left tube 411f of the second-stage first frame 411, until the first-stage right tube 315 passes through the inner ring of the second-stage left plate 411a and penetrates into the interior of the second-stage outer plate 411c to connect with the second-stage sun gear 440, so that the second-stage sun gear 440 sleeved on the first-stage right tube 315 is engaged with the second-stage planetary gear 420.

[0166] S230: The primary ring gear 330 is fixed to the inner wall of the secondary left tube 411f, and the primary ring gear 330 is meshed with the primary planetary gears 320. The secondary second carrier 412 is then connected to the left side of the primary planetary carrier 310, so that the secondary first carrier 411 and the secondary second carrier 412 are connected to form the secondary planetary carrier 410.

[0167] The motor 200 , the secondary reduction gear 400 , and the primary reduction gear 300 are arranged from right to left, and the secondary reduction gear 400 and the primary reduction gear 300 can be assembled as a whole, thereby effectively improving assembly efficiency.

[0168] In step S300, the primary reduction gear 300 and the secondary reduction gear 400 are inserted into the arm body 100d from the first side 100a of the support arm 100 until the secondary left tube 412a of the secondary second frame 412 is located at the second side 100b of the support arm 100, thereby connecting the axle as a power output. Finally, the motor 200 is fixed to the first side 100a of the support arm 100 using bolts or the like.

[0169] Referring to Figure 2, the working principle of the wheel drive assembly is as follows:

[0170] The motor 200 drives the reduction shaft 500 to rotate, and the reduction shaft 500 drives the primary sun gear 340 to rotate. Since the primary planetary gear 320 is engaged between the primary sun gear 340 and the primary ring gear 330, and both the primary sun gear 340 and the primary ring gear 330 are rotating, and the primary planetary gear 320 is rotatably arranged on the primary planet carrier 310, the primary planet carrier 310 rotates under the action of the primary sun gear 340 and the primary ring gear 330.

[0171] The primary planetary carrier 310 drives the secondary sun gear 440 to rotate. Since the secondary planetary gear 420 is engaged between the secondary sun gear 440 and the secondary ring gear 430, and the secondary ring gear 430 is fixed, the secondary planetary gear 420 rotates under the action of the secondary sun gear 440 and the secondary ring gear 430, so that the left end of the secondary planetary carrier 410 transmits output on the second surface 100b of the support arm 100.

[0172] In summary, by arranging the primary reduction gear 300 and the secondary reduction gear 400 within the arm body 100d of the support arm 100, the structure becomes more compact and the overall axial dimension is shortened. Furthermore, the primary reduction gear 300, the secondary reduction gear 400, and the motor 200 are arranged axially according to their respective circumferential dimensions, with the primary reduction gear 300 (with a smaller circumferential dimension) positioned on the outside and the secondary reduction gear 400 (with a larger circumferential dimension) positioned between the motor 200 and the primary reduction gear 300. This prevents the circumferential dimensions from increasing and prevents interference with the airbag 600 and other components arranged on the circumferential side of the support arm 100. This novel arrangement fully utilizes the mechanical space and further reduces the occupied space.

[0173] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. The scope of the patent application of the present invention cannot be limited by these embodiments alone. That is, any equivalent changes or modifications made according to the spirit disclosed by the present invention still fall within the patent scope of the present invention.

Claims

1. A wheel drive assembly, characterized in that: include: A support arm (100), the support arm (100) having a first surface (100a) and a second surface (100b) opposite to each other, and an arm body (100d) connected between the first surface (100a) and the second surface (100b); A motor (200), the motor (200) being connected to the first surface (100a) of the support arm (100); A first-stage deceleration device (300), wherein the first-stage deceleration device (300) is located inside the arm body (100d); A secondary reduction gear (400), wherein the secondary reduction gear (400) is located inside the arm body (100d) (100c), the motor (200), the primary reduction gear (300) and the secondary reduction gear (400) are sequentially connected in transmission, the secondary reduction gear (400) is located between the primary reduction gear (300) and the motor (200), and the secondary reduction gear (400) realizes power output through a secondary planetary carrier (410).

2. The wheel drive assembly according to claim 1, characterized in that: The primary reduction (300) comprises: A primary sun gear (340), the primary sun gear (340) being connected to the motor (200); A primary planet carrier (310), the primary planet carrier (310) being sleeved outside the primary sun gear (340), and the right side of the primary planet carrier (310) being connected to the secondary sun gear (440) of the secondary reduction gear (400); A first-stage planetary gear (320), the first-stage planetary gear (320) being rotatably disposed on the first-stage planet carrier (310), the first-stage planetary gear (320) being meshed with the first-stage sun gear (340); A primary ring gear (330), the primary ring gear (330) is arranged around the outer periphery of the primary planet carrier (310), and the primary ring gear (330) is meshed with the primary planet gear (320).

3. The wheel drive assembly according to claim 2, characterized in that: The primary planet carrier (310) comprises: A left side plate (311); A first-level right side plate (312), wherein the first-level planetary gear (320) is rotatably arranged between the first-level right side plate (312) and the first-level left side plate (311); a first-stage right tube (315), the first-stage right tube (315) being connected to the inner ring of the first-stage right side plate (312), the first-stage right tube (315) being provided with a second-stage sun gear (440) of the second-stage reduction gear (400), the second-stage sun gear (440) being meshed with the second-stage planetary gear (420); A first-stage left tube (317), the first-stage left tube (317) is connected to the inner ring of the first-stage left side plate (311), a bearing is provided between the first-stage left tube (317) and the second-stage second frame (412) of the second-stage planetary frame (410), and a bearing is provided between the first-stage right tube (315) and the second-stage left side plate (411a).

4. The wheel side drive assembly according to claim 2, characterized in that: The secondary reduction (400) comprises: A secondary planet carrier (410), one end of the secondary planet carrier (410) is connected to the half shaft, and the other end of the secondary planet carrier (410) is rotationally connected to the motor (200); A secondary planetary gear (420), the secondary planetary gear (420) being rotatably disposed on the secondary planetary carrier (410); A secondary ring gear (430), the secondary ring gear (430) is arranged around the outer circumference of the secondary planetary carrier (410) and fixed on the inner wall of the arm body (100d), and the secondary ring gear (430) is meshed with the secondary planetary gear (420); A secondary sun gear (440), the secondary sun gear (440) is meshed with the secondary planetary gear (420).

5. The wheel drive assembly according to claim 4, characterized in that: The secondary planetary gear (420) comprises a secondary first gear (421) and a secondary second gear (422); the secondary first gear (421) and the secondary second gear (422) are connected in an integral manner along the axial direction; the secondary first gear (421) is meshed with the secondary sun gear (440); the secondary second gear (422) is meshed with the secondary ring gear (430); and the diameter of the secondary first gear (421) is greater than the diameter of the first gear (421).

6. The wheel side drive assembly according to claim 4, characterized in that: The secondary planet carrier (410) comprises: A secondary first frame (411), on which the secondary planetary gear (420) is rotatably mounted; The second secondary frame (412) has a left side connected to the half shaft, the right side of the second secondary frame (412) is connected to the second secondary frame (411), and the first primary gear ring (330) is axially limited. Between the secondary first frame (411) and the secondary second frame (412).

7. The wheel drive assembly according to claim 6, characterized in that: The secondary first frame (411) comprises: Secondary left side plate (411a); A secondary right side plate (411b), wherein the secondary planetary gear (420) is rotatably arranged between the secondary right side plate (411b) and the secondary left side plate (411a); A secondary right tube (411e), the secondary right tube (411e) being connected to the inner ring of the secondary right side plate (411b), and a bearing being arranged between the secondary right tube (411e) and the motor (200); A secondary left tube (411f), the secondary left tube (411f) is connected to the outer ring of the secondary left side plate (411a), and the primary speed reducer (300) is located inside the secondary left tube (411f).

8. The wheel drive assembly according to claim 6, characterized in that: The secondary second frame (412) comprises: A secondary second left tube (412a), wherein a bearing is provided between the secondary second left tube (412a) and the support arm (100); The secondary second disc (412b) is connected to the secondary second left tube (412a), and the primary gear ring (330) is axially limited between the secondary second disc (412b) and the secondary left tube (411f).

9. The wheel side drive assembly according to claim 4, characterized in that: The first-stage planetary gear (320) is arranged on the first-stage planetary carrier (310) via the first-stage wheel shaft (314); the second-stage planetary gear (420) is arranged on the second-stage planetary carrier (410) via the second-stage wheel shaft (411d); The first-stage planetary gear (320) is located on the axial side of the second-stage planetary gear (420); a first-stage oil passage (314a) is provided on the first-stage wheel shaft (314) on the side facing the second-stage planetary gear (420); the first-stage oil passage (314a) is connected between the first-stage planetary gear (320) and the first-stage wheel shaft (314); a second-stage oil passage (411d1) is provided on the second-stage wheel shaft (411d) on the side facing the first-stage planetary gear (320); the second-stage oil passage (411d1) is connected between the second-stage planetary gear (420) and the second-stage wheel shaft (411d).

10. The wheel drive assembly according to claim 4, characterized in that: Also includes: A reduction shaft (500), the reduction shaft (500) is connected to the motor (200), the reduction shaft (500) is sequentially penetrated by the primary planetary carrier (310) and the secondary planetary carrier (410), the primary planetary carrier (310) and the secondary planetary carrier (410) are respectively rotatably connected to the reduction shaft (500), and the primary sun gear (340) is connected to the outer wall of the reduction shaft (500).

11. The wheel side drive assembly according to claim 4, characterized in that: The secondary planetary gear (420) comprises a secondary first gear (421) and a secondary second gear (422); the secondary first gear (421) and the secondary second gear (422) are connected in an integral manner along the axial direction; the secondary first gear (421) and the secondary sun gear (440) are meshed; and the secondary second gear (422) and the secondary ring gear (430) are meshed.

12. The wheel drive assembly according to claim 1, characterized in that: The support arm (100) comprises a mounting base (110), wherein the mounting base (110) comprises: A first housing (111); a second shell (112), one side of the second shell (112) being connected to the first shell (111), the other side of the second shell (112) being used for connecting to a drive device (200), and a circumferential dimension of the second shell (112) being greater than a circumferential dimension of the first shell (111); The interior of the first housing (111) and the interior of the second housing (112) are connected to form a stepped hole (1000), and the stepped hole (1000) is used to accommodate the reduction assembly (900). The primary reduction gear (300) is arranged inside the first housing (111), and the secondary reduction gear (400) is arranged inside the second housing (112).

13. A method for assembling a wheel drive assembly, characterized in that: The following steps are involved: A support arm (100) is provided, wherein the support arm (100) has a first surface (100a) and a second surface (100b) opposite to each other, and an arm body (100d) connecting the first surface (100a) and the second surface (100b); Connecting the secondary reduction gear (400) between the primary reduction gear (300) and the motor (200); The primary reduction gear (300) and the secondary reduction gear (400) are inserted into the arm body (100d) from the first surface (100a) of the support arm (100), and the motor (200) is connected to the first surface (100a), and the secondary reduction gear (400) realizes power output through the secondary planetary carrier (410).

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