Wheel edge driving assembly and assembling method thereof

Abstract

The 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 speed reducer and a second-stage speed reducer, the supporting arm is provided with a first surface and a second surface which are opposite to each other, and an arm body connected between the first surface and the second surface; the motor is connected with the first surface of the supporting arm; the first-stage speed reducer is located in the arm body; the first-stage speed reducer is located in the arm body, the second-stage speed reducer is located in the arm body, the motor, the first-stage speed reducer and the second-stage speed reducer are sequentially in transmission connection, the second-stage speed reducer is located between the first-stage speed reducer and the motor, power output is achieved through a second-stage planet carrier, the structure is more compact, and meanwhile the overall axial size is shortened.

Description

Technical Field

[0001] The 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-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, and the reduction box is provided with a primary reduction and a secondary reduction, that is, the motor is sequentially transmitted to the wheel hub through the primary reduction and the secondary reduction. The wheel hub, the support arm, the reduction box and the motor are sequentially connected along the axial direction, so that the overall axial dimension is large, which occupies a large space.

[0004] For example, the wheel-side drive device disclosed in publication number CN208439060U has a motor and a support arm arranged side by side, and the motor and the support arm are connected to the same side of the reduction box. Although the advantage of a smaller axial dimension can be ensured, the overall contour area is increased. In addition, elastic elements and damping elements need to be installed on the support arm and arranged at the contour edge of the reduction box, which limits the arrangement of the motor and the support arm side by side. Summary of the invention

[0005] 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.

[0006] According to one object of the present invention, the present invention provides a wheel side drive assembly, comprising:

[0007] A support arm, the 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;

[0008] a motor connected to the first surface of the support arm;

[0009] A first-stage reduction gear, the first-stage reduction gear is located in the arm body;

[0010] A secondary reduction gear is provided inside the arm body, wherein the motor, the primary reduction gear and the secondary reduction gear are sequentially connected in transmission, the secondary reduction gear is provided between the primary reduction gear and the motor, and the secondary reduction gear realizes power output through a secondary planetary carrier.

[0011] As a preferred embodiment, the arm body includes a first arm body and a second arm body, the first arm body is connected between the first surface and the second arm body, and the second arm body is connected between the first arm body and the second surface;

[0012] The circumferential dimension of the first arm body is greater than that of the second arm body. The second-stage reduction gear is arranged in the first arm body, and the first-stage reduction gear is arranged in the second arm body.

[0013] As a preferred embodiment, the primary reduction gear is arranged inside the secondary planetary carrier, and the primary ring gear of the primary reduction gear is fixed on the inner wall of the secondary planetary carrier.

[0014] As a preferred embodiment, the first-stage reduction includes:

[0015] A primary sun gear, the primary sun gear is connected to the motor;

[0016] A primary planet carrier, the primary planet carrier is sleeved outside the primary sun gear, and the right side of the primary planet carrier is connected to the secondary sun gear of the secondary reduction;

[0017] A primary planetary gear, the primary planetary gear is rotatably arranged on the primary planet carrier, and the primary planetary gear is meshed with the primary sun gear;

[0018] A primary ring gear is arranged around the outer periphery of the primary planet carrier, and the primary ring gear is meshed with the primary planetary gear.

[0019] As a preferred embodiment, the secondary reduction includes:

[0020] A secondary planet carrier, one end of which is connected to the half shaft, and the other end of which is rotatably connected to the motor;

[0021] A secondary planetary gear, the secondary planetary gear is rotatably arranged on the secondary planetary carrier;

[0022] A secondary ring gear, which is wound around the outer circumference of the secondary planet carrier and fixed on the inner wall of the arm body, and is meshed with the secondary planet gear;

[0023] The secondary sun gear is meshed with the secondary planetary gear.

[0024] 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.

[0025] As a preferred embodiment, the secondary planet carrier comprises:

[0026] A secondary first frame, on which the secondary planetary gear is rotatably mounted;

[0027] 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.

[0028] As a preferred embodiment, it also includes:

[0029] A reduction shaft, the reduction shaft is connected to the motor, the reduction shaft passes through the primary planetary carrier and the secondary planetary carrier in sequence, the primary planetary carrier and the secondary planetary carrier are respectively rotatably connected to the reduction shaft, and the primary sun gear is connected to the outer wall of the reduction shaft.

[0030] As a preferred embodiment, the motor is an axial flux motor.

[0031] According to another object of the present invention, the present invention also provides a method for assembling a wheel drive assembly, comprising the following steps:

[0032] 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;

[0033] Connect the secondary reduction gear between the primary reduction gear and the motor;

[0034] 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 planet carrier.

[0035] Compared with the prior art, this technical solution has the following advantages:

[0036] By opening the assembly through hole on the support arm and arranging the primary reduction gear and the secondary 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.

[0037] The primary reduction gear, the secondary reduction gear and the motor are arranged axially according to their respective circumferential dimensions, with the primary reduction gear having a smaller circumferential dimension being placed on the outside, and the secondary reduction gear having a larger circumferential dimension being placed between the motor and the primary reduction gear. This will 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.

[0038] The present invention is further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A cross-sectional view of the wheel side drive assembly of the present invention;

[0040] Figure 2 It is a partial cross-sectional view of the wheel side drive assembly of the present invention;

[0041] Figure 3 A three-dimensional diagram of the wheel side drive assembly of the present invention;

[0042] Figure 4 It is a three-dimensional diagram of the first-stage reduction gear of the present invention;

[0043] Figure 5 It is a cross-sectional view of the first-stage reduction gear of the present invention;

[0044] Figure 6 It is a three-dimensional diagram of the two-stage reduction gear of the present invention;

[0045] Figure 7 It is a cross-sectional view of the two-stage reduction gear of the present invention;

[0046] Figure 8 It is a schematic diagram of one direction of the secondary first frame of the present invention;

[0047] Fig. 9 It is a schematic diagram of the second-level first frame of the present invention from another direction;

[0048] Fig.10 A three-dimensional diagram of the second frame of the second stage of the present invention;

[0049] Fig.11 is a three-dimensional diagram of the support arm of the present invention;

[0050] Fig.12 It is a cross-sectional view of the support arm of the present invention.

[0051] In the figure: 100 support arm, 100a first surface, 100b second surface, 100d arm body, 100d1 first arm body, 100d2 second arm body, 100d3 middle arm body, 120 upper support arm, 130 lower support arm, 200 motor, 210 motor flange, 300 first-stage reduction, 310 first-stage planetary frame, 311 first-stage left plate, 312 first-stage right plate, 313 first-stage outer 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-stage left plate, 411 b secondary right side plate, 411c secondary outer side plate, 411c1 secondary notch, 411d secondary connecting shaft, 411d1 secondary oil channel, 411d2 secondary hole, 411e secondary right tube, 411f secondary left tube, 411f1 slot, 411f2 secondary step, 411g secondary bearing, 412 secondary second frame, 412a secondary second left tube, 412b secondary second disk, 412c second disk snap ring, 420 secondary planetary gear, 421 secondary first gear, 422 secondary second gear, 430 secondary ring gear, 440 secondary sun gear, 500 reduction shaft, 600 airbag, 710 first bearing, 720 second bearing, 730 third bearing, 740 fourth bearing, 750 fifth bearing, 810 oil seal, 830 half-axle sleeve, 840 brake disc, 850 caliper. DETAILED DESCRIPTION

[0052] 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.

[0053] First embodiment

[0054] like Figure 1 and Figure 2 As shown, the wheel side drive assembly includes:

[0055] 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;

[0056] A motor 200, wherein the motor 200 is connected to the first surface 100a of the support arm 100;

[0057] A first-stage deceleration device 300, wherein the first-stage deceleration device 300 is located inside the arm body 100d;

[0058] The secondary reduction gear 400 is located inside the arm body 100d, 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.

[0059] By arranging the primary reduction 300 and the secondary reduction 400 inside the arm body 100d of the support arm 100, the structure is made more compact and the overall axial dimension is shortened. 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 airbag 600 and the like arranged at the edge of the contour of the support arm 100. The arrangement is novel, the mechanism space is fully utilized, and the occupied space is further reduced.

[0060] like Figure 2 , Fig.11 and Fig.12 As shown, the support arm 100 includes an upper arm 120 and a lower arm 130, and 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.

[0061] The two axial sides of the arm body 100d are respectively a first surface 100a and a second surface 100b. 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. The second arm body 100d2 is connected between the first arm body 100d1 and the second surface 100b.

[0062] The circumferential dimension of the first arm body 100d1 is greater than the circumferential dimension 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.

[0063] For the two-stage reduction mechanism, the circumferential size of the first stage reduction is usually smaller than that of the second stage reduction. If the motor, the first stage reduction and the second stage reduction are arranged in sequence according to the power transmission path, the circumferential size of the second stage reduction at the end is smaller and larger, which is not conducive to reducing the axial size of the wheel side drive assembly. In this embodiment, the first stage reduction 300 with a smaller circumferential size is placed on the outside, and the second stage reduction 400 with a larger circumferential size is placed between the motor 200 and the first stage reduction 300. The second stage reduction mechanism can be arranged deeper in the arm body 100d of the support arm 100, effectively avoiding the above-mentioned defects and further reducing the axial size of the wheel side drive assembly.

[0064] like Fig.12 As shown, the arm body 100d also includes an intermediate arm body 100d3, and the intermediate arm body 100d3 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 columnar, 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 step structure.

[0065] refer to Figure 1 The airbag 600 is arranged obliquely at the edge of the outline of the arm 100d, wherein the horizontal height of the right side of the airbag 600 is higher than the horizontal height of the left side of the airbag 600. At this time, the arm 100d does not affect the arrangement of the airbag 600, and at the same time provides sufficient internal space to accommodate the primary reduction gear 300 and the secondary reduction gear 400. Figure 2 As shown, the primary reduction gear 300 is arranged inside the secondary planetary carrier 410, making the structure more compact. At the same time, the primary ring gear 300 of the primary reduction gear 300 is fixed on the inner wall of the secondary planetary carrier 410, which can extend the service life of the bearing.

[0066] like Figure 2 As shown, the primary reduction gear 300 is located in the second arm body 100d2 of the support arm 100, and the primary reduction gear 300 is arranged close to the second surface 100b relative to the motor 200. The primary reduction gear 300 includes:

[0067] A primary sun gear 340, wherein the primary sun gear 340 is connected to the motor 200;

[0068] 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;

[0069] 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;

[0070] 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 .

[0071] 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 engaged 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 rotating, 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 is transmitted and output through the output end on the right side.

[0072] like Figure 4 and Figure 5 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.

[0073] refer to Figure 5The 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.

[0074] 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 .

[0075] like Figure 2 , Figure 7 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 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.

[0076] like Figure 2 As shown, the secondary reduction gear 400 includes:

[0077] 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;

[0078] A secondary planetary gear 420, wherein the secondary planetary gear 420 is rotatably disposed on the secondary planetary carrier 410;

[0079] 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 arm body 100d, and the secondary ring gear 430 is meshed with the secondary planet gear 420;

[0080] 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 .

[0081] The primary planetary carrier 310 drives the secondary sun gear 440 to rotate, and the secondary planetary 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 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.

[0082] refer 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 gear ring 430 can be fixed on the inner wall of the motor flange 210, for example, by using a spline structure, so that the secondary gear ring 430 is inserted and fixed on the inner wall of the motor flange 210 from the left side of the motor 200.

[0083] refer to Figure 2 and Figure 4 The secondary sun gear 440 can be integrally or detachably connected to the primary right tube 315 of the primary planet carrier 310. Taking detachability as an example, a spline groove 315a can be provided on the outer wall of the primary right tube 315, and the secondary sun gear 440 is inserted into the primary right tube 315 from right to left using the spline groove 315a, and finally fixed by bolts.

[0084] like Figure 2 , Figures 6 to 9 As shown, the secondary planet carrier 410 includes:

[0085] A secondary first frame 411, on which the secondary planetary gear 420 is rotatably mounted;

[0086] 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 gear ring 330 is axially limited between the secondary first frame 411 and the secondary second frame 412 .

[0087] like Figures 6 to 9As 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.

[0088] refer 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 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.

[0089] like Figure 2 , Figure 7 and Figure 8 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 second bearing 720 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 third bearing 730 can be provided between the two to improve the structural reliability and ensure the stability of the rotation.

[0090] like Figure 2 and Figure 7As shown, the secondary first frame 411 also includes a secondary left tube 411f, which is connected to the outer ring of the secondary left side plate 411a, and the primary reducer 300 can be accommodated in the secondary left tube 411f, making the structure more compact. The primary right tube 315 of the primary planetary frame 310 passes through the inner ring of the secondary left side plate 411a, and penetrates into the secondary outer side plate 411c, and the secondary sun gear 440 is sleeved on the primary right tube 315 to engage with the secondary planetary gear 420. At the same time, a fourth bearing 740 is set between the primary right tube 315 and the secondary left side plate 411a.

[0091] like Figure 2 , Figure 6 and Figure 7 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.

[0092] 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.

[0093] like Figure 2 , Figure 7 and Fig.10 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 second surface 100b of the support arm 100 or be arranged inside the arm body 100d, serving as a power output and connecting the half shaft. Figure 2 A fifth bearing 750 may be provided between the secondary second left tube 412a and the support arm 100, and the fifth bearing 750 may be a double-row tapered roller bearing.

[0094] like Figure 2 , Figure 6 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.

[0095] like Figure 2 As shown, the primary reduction gear 300 and the secondary reduction gear 400 are jointly accommodated in the arm body 100d of the support arm 100, wherein the primary reduction gear 300 is arranged inside the secondary reduction gear 400, and thus can be lubricated as a whole, wherein two oil seals 810 are provided on both axial sides of the support arm 100, one of the oil seals 810 is located between the support arm 100 and the secondary second left tube 412a of the secondary 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 primary reduction gear 300 and the secondary reduction gear 400 are lubricated as a whole by rotating the primary planetary gear 320 and the secondary planetary gear 420 to throw oil, and at the same time enter the primary oil channel 314a and the secondary oil channel 411d1 to lubricate the bearings.

[0096] like Figure 1 and Figure 2 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.

[0097] like Figure 1 and Figure 3 As shown, the wheel side drive assembly further includes a half shaft sleeve 830, a brake disc 840 and a caliper 850, etc. The half shaft sleeve 830 is connected to the second surface 100b of the support arm 100, and a half shaft is arranged inside the half shaft sleeve 830. The brake disc 840 and the caliper 850 are arranged at the edge of the half shaft sleeve 830 contour.

[0098] Second embodiment

[0099] like Figure 2 , Figure 5 and Figure 7 As shown, the assembly method of the wheel side drive assembly is as follows:

[0100] 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;

[0101] S200, connecting the secondary reduction gear 400 between the primary reduction gear 300 and the motor 200;

[0102] S300, inserting 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 connecting the motor 200 to the first surface 100a, the secondary reduction gear 400 realizes power output through the secondary planetary carrier 410.

[0103] The motor shaft of the motor 200 is connected to a reduction shaft 500, and the secondary planetary carrier 410 of the secondary reduction 400 includes a secondary first frame 411 and a secondary second frame 412 connected to each other, and then the step S200 includes:

[0104] S210, move the secondary ring gear 430 from the left side of the motor 200 and plug it into the inner wall of the motor flange 210 of the motor 200, and at the same time, sleeve the secondary first frame 411 on which the secondary planetary gear 420 is rotatably provided 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 mesh 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.

[0105] 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 circle of the second-stage left plate 411a, and penetrates into 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.

[0106] S230, fix the primary ring gear 330 on the inner wall of the secondary left tube 411f, and mesh the primary ring gear 330 with the primary planetary gear 320. Then connect the secondary second frame 412 to the left side of the primary planetary frame 310, so that the secondary first frame 411 and the secondary second frame 412 are connected to form the secondary planetary frame 410.

[0107] The motor 200 , the secondary reduction 400 , and the primary reduction 300 are arranged from right to left, and the secondary reduction 400 and the primary reduction 300 can be assembled as a whole, which effectively improves assembly efficiency.

[0108] In step S300, 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 until the secondary second left tube 412a of the secondary second frame 412 is located at the second surface 100b of the support arm 100, and the half shaft is connected as a power output. Finally, the motor 200 is fixedly connected to the first surface 100a of the support arm 100 by bolts or the like.

[0109] refer to Figure 2 The working principle of the wheel side drive assembly is as follows:

[0110] 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 meshed 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;

[0111] The primary planet carrier 310 drives the secondary sun gear 440 to rotate. Since 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, the secondary planet 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 planet carrier 410 transmits output on the second surface 100b of the support arm 100.

[0112] In summary, by arranging the primary reduction 300 and the secondary reduction 400 inside the arm body 100d of the support arm 100, the structure is made more compact and the overall axial dimension 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 airbag 600 and the like arranged on the circumferential side of the support arm 100. The arrangement is novel, the mechanism space is fully utilized, and the occupied space is further reduced.

[0113] 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 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 arm body (100d) comprises a first arm body (100d1) and a second arm body (100d2), wherein 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); The circumferential dimension of the first arm body (100d1) is greater than the circumferential dimension of the second arm body (100d2); the second-stage reduction gear (400) is arranged in the first arm body (100d1), and the first-stage reduction gear (300) is arranged in the second arm body (100d2).

3. The wheel drive assembly according to claim 1 or 2, characterized in that: The primary reduction gear (300) is arranged inside the secondary planetary carrier (410), and the primary ring gear (300) of the primary reduction gear (300) is fixed on the inner wall of the secondary planetary carrier (410).

4. The wheel side drive assembly according to claim 1 or 2, 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).

5. The wheel drive assembly according to claim 1 or 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).

6. The wheel drive assembly according to claim 5, 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).

7. The wheel drive assembly according to claim 5, characterized in that: The secondary planet carrier (410) comprises: A secondary first frame (411), on which the secondary planetary gear (420) is rotatably mounted; A secondary second frame (412), the left side of the secondary second frame (412) is connected to the half shaft, the right side of 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).

8. The wheel side drive assembly according to claim 5, 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).

9. The wheel side drive assembly according to claim 1, characterized in that: The motor (200) is an axial flux motor.

10. 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); Connect 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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