Wheel edge driving device

Abstract

The invention provides a wheel edge driving device which comprises a supporting arm, a motor, a second-stage speed reducer and a first-stage speed reducer, the motor is connected with the supporting arm, and a containing cavity is formed between the motor and the supporting arm; the second-stage speed reducer comprises a second-stage planet carrier, a second-stage planet wheel and a second-stage gear ring, the second-stage planet carrier is located in the containing cavity, bearings are arranged between the two axial ends of the second-stage planet carrier and the supporting arm and between the two axial ends of the second-stage planet carrier and the motor respectively, the second-stage planet wheel is rotationally arranged on the second-stage planet carrier, and the second-stage gear ring is arranged outside the second-stage planet carrier in a winding mode; the first-stage speed reducer comprises a first-stage planet carrier, a first-stage planet wheel and a first-stage gear ring, the first-stage planet carrier is located in the second-stage planet carrier, the first-stage planet wheel is rotationally arranged on the first-stage planet carrier, the first-stage gear ring is arranged outside the first-stage planet carrier in a winding mode, and the second-stage gear ring is arranged outside the second-stage planet carrier in a winding mode. And the first-stage gear ring is meshed with the first-stage planet wheel, and the first-stage gear ring is fixed on the second-stage planet carrier, so that the service life of the bearing is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of wheel side drive, and in particular to a wheel side drive device. Background Art

[0002] Wheel-side drive is a driving mode of pure electric vehicles, which has the advantages of short power transmission route, flexible layout, and low vehicle floor. In the existing wheel-side drive electric vehicle structure, the motor is most commonly connected to the half-axle through a reduction gearbox, and the power transmission sequence is: the motor is decelerated through the reduction gearbox and the power is transmitted to the half-axle of the rear axle to drive the vehicle.

[0003] For example, the driving device disclosed in publication number CN209351248U includes a wheel hub, a support arm, a reduction box and a motor, wherein the reduction box is provided with a primary reduction and a secondary reduction, and the secondary reduction, the primary reduction and the motor are arranged from left to right, that is, the motor is sequentially transmitted to the wheel hub through the primary reduction and the secondary reduction. The primary reduction and the secondary reduction are suspended in the reduction box, and a bearing is arranged near the wheel hub side, so that the load on the bearing is large, which affects the service life of the bearing. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a wheel-side drive assembly which can prolong the service life of the bearing and has a compact structure.

[0005] A wheel side driving device, comprising:

[0006] Support arm;

[0007] A motor, wherein the motor is connected to the support arm and a receiving cavity is formed between the motor and the support arm;

[0008] The secondary reduction comprises a secondary planet carrier, a secondary planetary gear and a secondary ring gear, wherein the secondary planet carrier is located in the accommodating chamber, and bearings are respectively arranged between the axial ends of the secondary planet carrier and the support arm and the motor, and the secondary planetary gear is rotatably arranged on the secondary planet carrier, and the secondary ring gear is wound around the outside of the secondary planet carrier, and the secondary ring gear is meshed with the secondary planetary gear, and the secondary planet carrier is fixed on the inner wall of the accommodating chamber,

[0009] A first-stage reduction gear comprises a first-stage planetary carrier, a first-stage planetary wheel and a first-stage ring gear, wherein the first-stage planetary carrier is located inside the second-stage planetary carrier, a first-stage planetary wheel is rotatably arranged on the first-stage planetary carrier, the first-stage ring gear is wound around the outside of the first-stage planetary carrier, the first-stage ring gear is meshed with the first-stage planetary wheel, and the first-stage ring gear is fixed to the second-stage planetary carrier.

[0010] As a preferred embodiment, the secondary planet carrier comprises:

[0011] A secondary first frame, on which the secondary planetary gear is rotatably mounted;

[0012] The secondary second frame is connected to the secondary first frame, and the primary gear ring 330 is axially limited between the secondary first frame and the secondary second frame.

[0013] As a preferred embodiment, the secondary first frame includes:

[0014] Secondary left side plate;

[0015] 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;

[0016] A secondary right tube, the secondary right tube is connected to the inner ring of the secondary right side plate, and a bearing is provided between the secondary right tube and the motor;

[0017] A 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.

[0018] As a preferred embodiment, the secondary second frame includes:

[0019] A secondary second left tube, a bearing is provided between the secondary second left tube and the support arm;

[0020] 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.

[0021] As a preferred embodiment, a secondary step is provided on the inner wall of the secondary left tube, and a clamping groove is also provided on the inner wall of the secondary left tube, and the clamping groove extends from the secondary step to the left end face of the secondary left tube;

[0022] A second disc clamp ring is provided on the right end surface of the secondary second disc, the outer diameter of the secondary second disc is larger than the outer diameter of the second disc clamp ring, the second disc clamp ring is inserted into the clamping groove, and the secondary second disc abuts against the secondary left tube;

[0023] The first-stage gear ring is inserted into the clamping groove, and the first-stage gear ring is axially limited between the second disk clamping ring and the second-stage step.

[0024] As a preferred embodiment, the primary planet carrier comprises:

[0025] Level 1 left side plate;

[0026] A first-level right side plate, wherein the first-level planetary gear is rotatably arranged between the first-level right side plate and the first-level left side plate;

[0027] A primary right tube, the primary right tube is connected to the inner ring of the primary right side plate, the primary right tube is provided with a secondary sun gear of the secondary reduction, and the secondary sun gear is meshed with the secondary planetary gear.

[0028] As a preferred embodiment, the primary planet carrier further comprises:

[0029] A first-stage left tube, the first-stage left tube is connected to the inner circle of the first-stage left side plate, a bearing is arranged between the first-stage left tube and the second-stage second frame body of the second-stage planetary frame, and a bearing is arranged between the first-stage right tube and the second-stage left side plate.

[0030] As a preferred embodiment, the support arm is provided with a through hole passing through the support arm along the axial direction, the motor is connected to one axial side of the support arm through a flange to form the accommodating cavity between the through hole and the inside of the flange, and the secondary gear ring is fixed on the inner wall of the flange.

[0031] As a preferred embodiment, it also includes a reduction shaft, which is connected to the motor shaft of the motor, and passes through the secondary planetary carrier and the primary planetary carrier. A primary sun gear for primary reduction is provided on the reduction shaft, and the primary sun gear is meshed with the primary planetary gear. Bearings are respectively provided between the reduction shaft and the secondary planetary carrier and the primary planetary carrier.

[0032] As a preferred embodiment, the motor is an axial flux motor.

[0033] Compared with the prior art, this technical solution has the following advantages:

[0034] Bearings are arranged at the axial ends of the secondary planetary carrier, respectively, between the support arm and the motor. Compared with the prior art in which the bearings are only installed on the hub side, the rotation is more stable and the bearing load is prevented from being too large and affecting the service life.

[0035] The primary reduction gear is located inside the secondary reduction gear, has a compact structure, and reduces occupied space. The primary ring gear of the primary reduction gear is fixed to the secondary planetary carrier, that is, the primary ring gear rotates together with the secondary planetary carrier, and the left side of the secondary 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.

[0036] The present invention is further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A cross-sectional view of the wheel-side drive device of the present invention;

[0038] Figure 2 It is a three-dimensional diagram of the first-stage reduction gear of the present invention;

[0039] Figure 3 It is a cross-sectional view of the first-stage reduction gear of the present invention;

[0040] Figure 4 It is a three-dimensional diagram of the two-stage reduction gear of the present invention;

[0041] Figure 5 It is a cross-sectional view of the two-stage reduction gear of the present invention;

[0042] Figure 6 A three-dimensional diagram of the second-level first frame of the present invention;

[0043] Figure 7 It is a three-dimensional diagram of the second secondary frame of the present invention.

[0044] In the figure: 100 support arm, 1000 accommodating cavity, 1001 through hole, 200 motor, 210 motor flange, 300 first-stage reduction, 310 first-stage planetary frame, 311 first-stage left side plate, 312 first-stage right side plate, 313 first-stage outer side plate, 313a first-stage notch, 314 first-stage connecting shaft, 314a first-stage oil channel, 314b first-stage hole, 315 first-stage right pipe, 315a spline groove, 316 first-stage bearing, 317 first-stage left pipe, 320 first-stage planetary gear, 330 first-stage ring gear, 340 first-stage sun gear, 400 second-stage reduction, 410 second-stage planetary frame, 411 second-stage first frame, 411a second 411a left side plate of the secondary stage, 411b right side plate of the secondary stage, 411c outer side plate of the secondary stage, 411c1 notch of the secondary stage, 411d connecting shaft of the secondary stage, 411d1 oil channel of the secondary stage, 411d2 hole of the secondary stage, 411e right tube of the secondary stage, 411f1 slot of the secondary stage, 411f2 step of the secondary stage, 411g bearing of the secondary stage, 412 second frame of the secondary stage, 412a second left tube of the secondary stage, 412b second disk of the secondary stage, 412c second disk snap ring of the secondary stage, 420 planetary gear of the secondary stage, 421 first gear of the secondary stage, 422 second gear of the secondary stage, 430 ring gear of the secondary stage, 440 sun gear of the secondary stage, 500 reduction shaft and 700 bearing. DETAILED DESCRIPTION

[0045] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0046] like Figure 1 As shown, the wheel side driving device comprises:

[0047] Support arm 100;

[0048] A motor 200, wherein the motor 200 is connected to the support arm 100, and a receiving cavity 1000 is formed between the motor 200 and the support arm 100;

[0049] The secondary reduction gear 400 comprises a secondary planet carrier 410, a secondary planetary gear 420 and a secondary ring gear 430. The secondary planet carrier 420 is located in the accommodating chamber 1000. The axial ends of the secondary planet carrier 410 are respectively provided with bearings 700 between the support arm 100 and the motor 200. The secondary planetary gear 420 is rotatably provided on the secondary planet carrier 410. The secondary ring gear 430 is wound around the outside of the secondary planet carrier 410. The secondary ring gear 430 is meshed with the secondary planetary gear 420. The secondary planet carrier 410 is fixed on the inner wall of the accommodating chamber 1000.

[0050] The first-stage reduction gear 300 includes a first-stage planetary carrier 310, a first-stage planetary wheel 320 and a first-stage ring gear 330. The first-stage planetary carrier 320 is located inside the second-stage planetary carrier 410. The first-stage planetary wheel 320 is rotatably arranged on the first-stage planetary carrier 310. The first-stage ring gear 330 is wound around the outside of the first-stage planetary carrier 310. The first-stage ring gear 330 is meshed with the first-stage planetary wheel 320. The first-stage ring gear 330 is fixed on the second-stage planetary carrier 410.

[0051] The two axial ends of the secondary planet carrier 410 are respectively provided with bearings 700 between the support arm 100 and the motor 200. Compared with the prior art that only installs bearings on the hub side, the rotation is more stable and the bearing load is prevented from being overloaded and affecting the service life. The primary reduction 300 is located inside the secondary reduction 400, with a compact structure to reduce the occupied space, and the primary ring gear 330 of the primary reduction 300 is fixed to the secondary planet carrier 410, that is, the primary ring gear 330 rotates with the secondary planet carrier 410, and the left side of the secondary planet carrier 410 is connected to the hub through a half shaft, which reduces the rotation speed and further extends the service life of the bearing 700.

[0052] like Figure 1 , Figure 4 and Figure 5 As shown, the secondary reduction gear 400 includes:

[0053] A secondary planet 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;

[0054] A secondary planetary gear 420, wherein the secondary planetary gear 420 is rotatably disposed on the secondary planetary carrier 410;

[0055] A secondary ring gear 430, the secondary ring gear 430 is wound around the outer circumference of the secondary planet carrier 410 and fixed on the inner wall of the accommodating cavity 1000, and the secondary ring gear 430 is meshed with the secondary planet gear 420;

[0056] 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 .

[0057] The primary planet carrier 310 drives the secondary sun gear 440 to rotate, and the secondary planet gear 420 is meshed between the secondary sun gear 440 and the secondary ring gear 430, wherein the secondary ring gear 430 is fixed, so the secondary planet gear 420 rotates under the action of the secondary sun gear 440 and the secondary ring gear 430, so that the secondary planet carrier 410 drives the half shaft to rotate.

[0058] refer to Figure 1 The support arm 100 is provided with a through hole 1001 that penetrates the support arm 100 in the axial direction. The motor 200 is connected to one axial side of the support arm 100 through a flange 210 to form the accommodating cavity 1000 between the through hole 1001 and the inside of the flange 210. The secondary gear ring 430 is fixed on the inner wall of the flange 210.

[0059] Specifically, a motor flange 210 is provided on the left side of the motor 200, and the motor flange 210 is annular. The motor flange 210 is connected to the right side surface of the support arm 100, and 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 from the left side of the motor 200 and is plugged and fixed on the inner wall of the motor flange 210.

[0060] like Figure 1 , Figure 6 and Figure 7 As shown, the secondary planet carrier 410 includes:

[0061] A secondary first frame 411, on which the secondary planetary gear 420 is rotatably mounted;

[0062] The secondary second frame 412 is connected to the secondary first frame 411 , and the primary gear ring 330 is axially limited between the secondary first frame 411 and the secondary second frame 412 .

[0063] like Figures 4 to 6 As shown, the secondary first frame 411 includes a secondary left side plate 411a, a secondary right side plate 411b, a secondary outer side plate 411c and a secondary connecting shaft 411d, the secondary outer side plate 411c is respectively connected to the outer rings of the secondary left side plate 411a and the secondary right side plate 411b, the secondary connecting shaft 411d is connected between the secondary left side plate 411a and the secondary right side plate 411b, the number of the secondary connecting shafts 411d can also be three, and they are arranged at intervals in a circumference, each of the secondary connecting shafts 411d is respectively sleeved with one of the secondary planetary gears 420, a secondary bearing 411g is arranged between the secondary connecting shaft 411d and the secondary planetary gear 420, the secondary planetary gear 420 is maintained between the secondary left side plate 411a and the secondary right side plate 411b, and a secondary notch 411c1 is opened on the secondary outer side plate 411c to allow the secondary planetary gear 420 to be exposed and mesh with the secondary gear ring 430.

[0064] refer to Figure 5 The secondary connecting shaft 411d is inserted into the secondary left plate 411a and the secondary right plate 411b, and the right end surface 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 surface of the secondary connecting shaft 411d, and a secondary hole 411d2 is opened on the inner wall of the secondary oil channel 411d1. The lubricating oil can enter the secondary oil channel 411d1 from the right end surface 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.

[0065] like Figure 1 , Figure 5 and Figure 6 As shown, the secondary first frame 411 further includes a secondary right tube 411e, which is connected to the inner circle of the secondary right side plate 411b, and is plugged into the housing of the motor 200, and a bearing 700 is provided between the secondary right tube 411e and the housing of the motor 200. At the same time, the secondary right tube 411e is sleeved on the outside of the reduction shaft 500, and a bearing 700 can be provided between the two, so as to improve the structural reliability and ensure the stability of rotation.

[0066] like Figure 1 and Figure 6 As shown, the secondary first frame 411 further includes a secondary left tube 411f, which is connected to the outer ring of the secondary left side plate 411a. The primary reducer 300 can be accommodated in the secondary left tube 411f, making the structure more compact.

[0067] By arranging the primary reduction 300 and the secondary reduction 400 inside the accommodation cavity formed by the support arm and the motor, the structure is made more compact and the overall axial size is shortened. In addition, the primary reduction 300, the secondary reduction 400 and the motor 200 are arranged axially according to the size of their respective circumferential dimensions, and the primary reduction 300 with a smaller circumferential dimension is placed on the outside, and the secondary reduction 400 with a larger circumferential dimension is placed between the motor 200 and the primary reduction 300, so as to prevent the circumferential dimension from becoming larger and not interfere with the airbags arranged at the edge of the contour of the support arm 100. The arrangement is novel, the space of the mechanism is fully utilized, and the occupied space is further reduced.

[0068] like Figure 1 , Figure 4 and Figure 5 As shown, 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 meshed with the secondary sun gear 440, and the secondary second gear 422 is meshed with the secondary ring gear 430.

[0069] The secondary first gear 421 and the secondary second gear 422 are arranged from left to right, the circumferential dimension of the secondary first gear 421 is larger than the circumferential dimension of the secondary second gear 422, and the secondary first gear 421 and the secondary second gear 422 may adopt a helical gear structure.

[0070] like Figure 1 , Figure 6 and Figure 7 As shown, the secondary second frame 412 includes a secondary second left tube 412a and a secondary second plate 412b, wherein the secondary second left tube 412a is connected to the inner ring of the secondary second plate 412b, and the secondary second plate 412b is connected to the left side of the secondary left tube 411f and can be fixed by bolts or the like. The secondary second left tube 412a can extend from the left side of the support arm 100 or be arranged inside the support arm 100 to connect the half shaft. Figure 1 A bearing 700 may be provided between the secondary second left tube 412a and the support arm 100, and the bearing 700 may be a double-row tapered roller bearing.

[0071] like Figure 1 , Figure 4 and Figure 7As shown, 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 surface of the secondary left tube 411f. The right end face of the secondary second disk 412b is provided with a second disk snap ring 412c, wherein the outer diameter of the secondary second disk 412b is larger than the outer diameter of the second disk snap ring 412c, and the outer ring of the primary gear ring 330 is provided with a gear ring snap ring, which is matched with the snap groove 411f1, so that the primary gear ring 330 is inserted from the left end face of the secondary left tube 411f and arranged inside the secondary left tube 411f, and then the second disk snap ring 412c is inserted into the snap groove 411f1 until the second disk snap ring 412c abuts against the left end face of the secondary left tube 411f, so that the primary gear ring 330 is axially limited between the second disk snap ring 412c and the secondary step 411f2. It can be seen that the secondary planet carrier 410 is a split structure for easy overall assembly.

[0072] like Figures 1 to 3 As shown, the primary reduction gear 300 includes:

[0073] A primary sun gear 340, wherein the primary sun gear 340 is connected to the motor 200;

[0074] A primary planet carrier 310, wherein the primary planet carrier 310 is sleeved outside 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;

[0075] A primary planetary gear 320, wherein the primary planetary gear 320 is rotatably disposed on the primary planet carrier 310, the primary planetary gear 320 is meshed with the primary sun gear 340, and the primary planetary gear 320 may adopt a helical gear structure;

[0076] The primary ring gear 330 is wound around the outer circumference of the primary planet carrier 310 and fixed on the inner wall of the secondary planet carrier 410 . The primary ring gear 330 is meshed with the primary planetary gear 320 .

[0077] The motor shaft of the motor 200 is connected to the reduction shaft 500, and the reduction shaft 500 passes through the primary reduction 300 and the secondary reduction 400. The primary sun gear 340 can be integrally or detachably connected to the reduction shaft 500, and the primary planet carrier 310 is rotatably arranged on the outer wall of the reduction shaft 500, so that the reduction shaft 500 drives the primary sun gear 340 to rotate, and the primary planet gear 320 is meshed between the primary sun gear 340 and the primary ring gear 330. Since the primary sun gear 340 and the primary ring gear 330 are both rotatable, and the primary planet gear 320 is rotatably arranged on the primary planet carrier 310, the primary planet carrier 310 is driven to rotate, so that the primary planet carrier 310 drives the secondary sun gear 440 to rotate.

[0078] like Figure 2 and Figure 3 As shown, 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. The number of the primary connecting shafts 314 can be three and they are arranged at intervals in a circle. Each of the primary connecting shafts 314 is sleeved with a primary planetary gear 320. The primary planetary gear 320 is held between the primary left plate 311 and the primary right plate 312. A primary notch 313a is provided on the primary outer plate 313 so that the primary planetary gear 320 is exposed and meshed with the primary gear ring 330. A primary bearing 316 can be provided between the primary connecting shaft 314 and the primary planetary gear 320.

[0079] refer to Figure 3 The primary connecting shaft 314 can be inserted into the primary left plate 311 and the primary right plate 312, and the right end surface of the primary connecting shaft 314 can be exposed on the primary right plate 312. A primary oil channel 314a can be opened on the right end surface of the primary connecting shaft 314, and a primary hole 314b is opened on the inner wall of the primary oil channel 314a. The lubricating oil can enter the primary oil channel 314a from the right end surface of the primary connecting shaft 314, and then pass through the primary hole 314b to lubricate the primary bearing 316 between the primary connecting shaft 314 and the primary planetary gear 320, thereby improving the lubricity and ensuring the reliability of operation.

[0080] The primary planet carrier 310 further includes a primary right tube 315, which is connected to the inner ring of the primary right side plate 312, wherein the primary right tube 315 of the primary planet carrier 310 passes through the inner ring of the secondary left side plate 411a and penetrates into the secondary outer side plate 411c, and a secondary sun gear 440 is sleeved on the primary right tube 315 to mesh with the secondary planet gear 420. Meanwhile, a bearing 700 is arranged between the primary right tube 315 and the secondary left side plate 411a.

[0081] like Figure 1 , Figure 2 As shown, the first-stage planetary carrier 310 also includes a first-stage left tube 317, and the first-stage left tube 317 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 bearing 700 can be arranged between the reduction shaft 500 and the first-stage left tube 317. The bearing 700 can be a double-row tapered roller bearing, so that the first-stage planetary carrier 310 can rotate relative to the reduction shaft 500.

[0082] like Figure 1 As shown, 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.

[0083] The embodiments described above are only used to illustrate the technical ideas and features of the present invention, and their purpose is to enable technicians in this field to understand the contents of the present invention and implement them accordingly. The patent scope of the present invention cannot be limited only by this embodiment, 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 side drive device, characterized in that: include: Support arm (100); A motor (200), the motor (200) being connected to the support arm (100), and a receiving cavity (1000) being formed between the motor (200) and the support arm (100); A secondary reduction gear (400), the secondary reduction gear (400) comprising a secondary planet carrier (410), a secondary planetary gear (420) and a secondary ring gear (430), the secondary planet carrier (420) being located in the accommodating chamber (1000), bearings (700) being arranged between the axial ends of the secondary planet carrier (410) and the support arm (100) and the motor (200), the secondary planetary gear (420) being rotatably arranged on the secondary planet carrier (410), the secondary ring gear (430) being arranged around the outside of the secondary planet carrier (410), the secondary ring gear (430) being meshed with the secondary planetary gear (420), and the secondary planet carrier (410) being fixed on the inner wall of the accommodating chamber (1000), A first-stage reduction gear (300), the first-stage reduction gear (300) comprising a first-stage planetary carrier (310), a first-stage planetary wheel (320) and a first-stage ring gear (330), the first-stage planetary carrier (320) being located inside the second-stage planetary carrier (410), the first-stage planetary wheel (320) being rotatably arranged on the first-stage planetary carrier (310), the first-stage ring gear (330) being wound around the outside of the first-stage planetary carrier (310), the first-stage ring gear (330) being meshed with the first-stage planetary wheel (320), and the first-stage ring gear (330) being fixed on the second-stage planetary carrier (410).

2. The wheel side drive device according to claim 1, 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 secondary second frame (412) is connected to the secondary first frame (411), and the primary gear ring (330) is axially limited between the secondary first frame (411) and the secondary second frame (412).

3. The wheel side drive device according to claim 2, 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 (700) being provided 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).

4. The wheel side drive device according to claim 3, characterized in that: The secondary second frame (412) comprises: A secondary second left tube (412a), wherein a bearing (700) 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).

5. The wheel side drive device according to claim 4, characterized in that: 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), wherein the clamping groove (411f1) extends from the secondary step (411f2) to the left end surface of the secondary left tube (411f); A second disc clamping ring (412c) is provided on the right end surface of the secondary second disc (412b), the outer diameter of the secondary second disc (412b) is larger than the outer diameter of the second disc clamping ring (412c), the second disc clamping ring (412c) is inserted into the clamping groove (411f1), and the secondary second disc (412b) is in contact with the secondary left tube (411f); The primary gear ring (330) is inserted into the clamping groove (411f1), and the primary gear ring (330) is axially limited between the second disk clamping ring (412c) and the secondary step (411f2).

6. The wheel side drive device according to claim 1, 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) is connected to the inner ring of the first-stage right side plate (312), and the first-stage right tube (315) is provided with a second-stage sun gear (440) of the second-stage reduction (400), and the second-stage sun gear (440) is meshed with the second-stage planetary gear (420).

7. The wheel side drive device according to claim 6, characterized in that: The first-stage planet carrier (310) further includes: 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 (700) is arranged between the first-stage left tube (317) and the second-stage second frame (412) of the second-stage planetary frame (410), and a bearing (700) is arranged between the first-stage right tube (315) and the second-stage left side plate (411a).

8. The wheel side drive device according to claim 1, characterized in that: The support arm (100) is provided with a through hole (1001) penetrating the support arm (100) along the axial direction, and the motor (200) is connected to one axial side of the support arm (100) via a flange (210) to form the accommodating cavity (1000) between the through hole (1001) and the inside of the flange (210), and the secondary gear ring (430) is fixed on the inner wall of the flange (210).

9. The wheel side drive device according to claim 1, characterized in that: The invention also comprises a reduction shaft (500), wherein the reduction shaft (500) is connected to the motor shaft of the motor (200), the reduction shaft (500) passes through the secondary planetary carrier (410) and the primary planetary carrier (310), the reduction shaft (500) is provided with a primary sun gear (340) of the primary reduction (300), the primary sun gear (340) is meshed with the primary planetary gear (320), and bearings (700) are respectively provided between the reduction shaft (500) and the secondary planetary carrier (410) and the primary planetary carrier (310).

10. The wheel drive device according to any one of claims 1 to 9, characterized in that: The motor (200) is an axial flux motor.

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