CN111619335B

CN111619335B - Driving wheel assembly

Info

Publication number: CN111619335B
Application number: CN202010279720.1A
Authority: CN
Inventors: 钱骏; 汪建勇; 丁震华; 贡满; 贾成银; 曹建华; 席俊明; 章峰峰; 张尧
Original assignee: Changxing Yongxiang Machinery Co ltd
Current assignee: Changxing Yongxiang Machinery Co ltd
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2021-03-23
Anticipated expiration: 2040-04-10
Also published as: CN111619335A

Abstract

The invention relates to a driving wheel assembly, which comprises a reduction box body, a transmission assembly, a driving motor and wheels, wherein the reduction box body comprises a lateral mounting part and a transverse mounting part, a mounting space is formed between the lateral mounting part and the transverse mounting part, and the reduction box body also comprises an inner gear ring; the wheel is rotatably arranged on the driving motor through a bearing; the wheel comprises a wheel core and a wheel rim, wherein a bulge is annularly arranged on the inner wall of the wheel core, and two side faces of the bulge are respectively abutted against the outer side end face of the inner gear ring and the bearing; the outer circumferential surface of the driving motor is of a step-shaped structure, and the bearing is arranged at the position of the maximum diameter of the driving motor; an elastic retainer ring assembly is clamped between the wheel core and the driving motor; the invention solves the technical problems that the driving wheel of the electric forklift can only be disassembled to replace wheels, but the replacement of the bearing and the secondary driven inner gear ring can be realized only by disassembling the brake, the left side cover of the reduction box and the motor, and the disassembly is complicated.

Description

Driving wheel assembly

Technical Field

The invention relates to the technical field of driving wheel mechanisms, in particular to a driving wheel assembly.

Background

The driving wheel is an important part in a carrying vehicle, particularly the driving wheel on an electric carrying vehicle generally comprises a driving support, a driving motor and a rubber-covered wheel assembly, wherein the driving motor and the rubber-covered wheel assembly are arranged in the driving support, the top of the driving support is connected with a direction control device of an electric forklift, a driving gear is fixed on an output shaft of the driving motor, a transmission shaft is rotatably arranged in the driving support, a first driven gear and a second driven gear are fixedly arranged on the transmission shaft, the driving gear is meshed with the first driven gear, an inner gear cylinder is rotatably connected outside the driving motor, an inner gear ring meshed with the second driven gear is arranged on the inner wall of the inner gear cylinder, and the rubber-covered wheel assembly is fixedly sleeved.

Patent document No. CN109649154A discloses a driving wheel of an electric forklift, which comprises a driving bracket, a driving motor mounted on the driving bracket, a transmission assembly and a rubber-coated wheel assembly rotatably connected to the outer ring of the driving motor, wherein the driving bracket comprises a mounting part and a connecting part, the connecting part comprises a transverse plate and a hollow connecting column, and the side wall of the transverse plate is provided with a threading through hole communicated with the inner cavity of the connecting column; driving motor is fixed in installation department one side, power control line passes threading through-hole and spliced pole inner chamber in proper order and is connected with electric fork truck's control system, the drive assembly includes the driving gear, transmission shaft and fixed suit are in epaxial first driven gear and the second driven gear of transmission, the driving gear is fixed in on driving motor's the output shaft, the transmission shaft passes through the bearing and supports the rotation and install in the installation department, driving gear and first driven gear meshing, rubber coating wheel subassembly includes sleeve and rubber coating wheel, the sleeve rotates the suit in driving motor's outer lane, be equipped with the ring gear with second driven gear intermeshing on the sleeve inner wall.

However, in the actual use process, the inventor finds that the electric forklift driving wheel can only be detached to replace wheels, but the replacement of the bearing and the secondary driven inner gear ring requires detaching the brake, detaching the left side cover of the reduction box and detaching the motor, so that the detachment is complex.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, the wheel is directly sleeved outside the driving motor through the bearing, the inner gear ring and the elastic retainer ring assembly are arranged on two sides of the bearing in parallel and are arranged on the wheel, so that when the electric forklift is disassembled, the elastic retainer ring assembly on the motor is removed, the bearing, the wheel and the inner gear ring can be disassembled and replaced, and simultaneously, the inner gear ring and the bearing are firstly installed on the wheel and then are directly installed on the driving motor, so that the accurate installation is realized, and the technical problem that the disassembly is complicated when the brake, the left side cover of the reduction box and the motor are required to be disassembled and replaced when the bearing and the secondary driven inner gear ring are replaced, is solved.

Aiming at the technical problems, the technical scheme is as follows: a driving wheel assembly comprises a reduction box body, a transmission assembly, a driving motor and wheels, wherein the transmission assembly is installed on the reduction box body, the driving motor is arranged in the reduction box body and is in matched transmission connection with the transmission assembly, the wheels are rotatably installed outside the driving motor, the reduction box body comprises a lateral installation part and a transverse installation part connected to the top of the lateral installation part, an installation space is formed between the lateral installation part and the transverse installation part, the reduction box body further comprises an inner gear ring in matched transmission with the transmission assembly, the end surfaces of two sides of the inner gear ring are respectively abutted against the transmission assembly and the wheels, and the outer circumferential surface of the inner gear ring is abutted against the inner wall of the; the wheel is rotatably arranged on the driving motor through a bearing; the wheel comprises a wheel core and a wheel rim, the inner wall of the wheel core is annularly provided with a convex part, and two side surfaces of the convex part are respectively abutted against the outer end surface of the inner gear ring and the bearing; the outer circumferential surface of the driving motor is of a stepped structure, and the bearing is arranged at the position of the maximum diameter of the driving motor; the wheel core and the driving motor are clamped by a circlip assembly, and the circlip assembly is arranged on the other side of the bearing relative to the inner gear ring.

Preferably, the bearings are arranged in a group and located at a central position of the wheel.

Preferably, the inner wall of the wheel core is further provided with a first limiting groove for mounting the inner gear ring, a second limiting groove for mounting the bearing and a third limiting groove for mounting the elastic retainer ring assembly in sequence;

the protruding portion is located between the first limiting groove and the second limiting groove, a plurality of groups of first connecting pieces used for connecting the inner gear ring with the protruding portion are arranged on the protruding portion, and the first connecting pieces are circumferentially and uniformly distributed on one side of the protruding portion.

Preferably, the outer circumferential surface of the driving motor is provided with a first step portion, a second step portion, a third step portion and a fourth step portion in sequence along the axial direction of the lateral mounting portion;

the first step part is provided with an avoiding square groove matched with the output end of the transmission assembly, and the second step part is provided with an installation ring groove matched with the thickness of the elastic retainer ring assembly;

the first step portion has a diameter of R1, the second step portion has a diameter of R2, the third step portion has a diameter of R3, and the fourth step portion has a diameter of R4; r2 > R3 > R1 > R4.

Preferably, the inner gear ring is of a stepped structure and comprises a connecting part and a transmission part which are integrally formed, and a gear ring is arranged on the inner wall of the connecting part and the inner wall of the transmission part;

the connecting part is abutted against the side wall of the protruding part.

Preferably, the transmission assembly comprises a transmission shaft which is rotatably arranged on the reduction box body and is parallel to a motor shaft of the driving motor, and a primary driven gear and a secondary driving gear which are arranged on the transmission shaft, the primary driven gear is in meshing transmission connection with the primary driving gear arranged on the motor shaft, and the secondary driving gear is in meshing transmission connection with the gear ring structure of the inner gear ring in a matched mode.

Preferably, the lateral mounting portion is provided with an upper shaft hole and a lower shaft hole, the central lines of the upper shaft hole and the lower shaft hole are located on the same vertical plane, the lateral mounting portion is provided with an annular inner gear ring positioning portion and an annular driving motor supporting portion in an axially protruding mode on one surface facing the transverse portion, the inner gear ring positioning portion and the driving motor supporting portion are arranged coaxially with the lower shaft hole, and the upper portion of the driving motor supporting portion is provided with a notch.

Preferably, the lateral mounting part further comprises a side plate which is arranged on one side of the lateral mounting part in a back direction and is hollow inside, an upper mounting groove and a lower mounting groove which are communicated with each other and are coaxially arranged with the upper shaft hole and the lower shaft hole in a one-to-one correspondence manner are formed in the side surface of the side plate, a sealing blank cap is arranged outside the upper mounting groove, and a brake is arranged outside the lower mounting groove;

the upper end of the side plate is provided with an open type visible window; the side plate is also provided with an oil cup.

Preferably, a double-lip framework oil seal is arranged between the reduction box body and the inner gear ring;

dustproof rings are arranged among the reduction box body, the inner gear ring and the wheels.

Preferably, the circlip assembly includes a shaft circlip and a hole circlip, and the shaft circlip abuts against an end surface of the bearing.

The invention has the beneficial effects that:

(1) according to the invention, the wheel is directly sleeved outside the driving motor by arranging the bearing, the inner gear ring and the elastic retainer ring assembly are arranged on two sides of the bearing in parallel and are arranged on the wheel, so that the elastic retainer ring assembly on the motor is removed when the bearing, the wheel and the inner gear ring can be disassembled and replaced, and meanwhile, the inner gear ring and the bearing are firstly installed on the wheel and then directly installed on the driving motor when the bearing is installed, so that the accurate installation is realized;

(2) according to the invention, one end of the inner gear ring is arranged to abut against the side wall of the bulge part, and the other end of the inner gear ring abuts against the rotating bearing on the transmission shaft, so that the inner gear ring is accurately installed and tightly combined with the wheel, the structure is stable, and the installation error is small;

(3) according to the invention, the lateral mounting part and the transverse mounting part are integrally formed, so that the transmission assembly mounted in the upper mounting groove and the driving tooth mounted on the motor in the lower mounting groove are accurately positioned, the processing and assembling errors are reduced, the production efficiency is improved, the transmission stability is ensured, and the stability of the forklift driving wheel during transmission is further ensured;

(4) according to the invention, the double-seal design of the double-lip framework oil seal and the dustproof ring is adopted at the positions of the reduction box body, the inner gear ring and the wheels, the dustproof ring is arranged in grooves of the wheels and the inner gear ring and is in non-contact with the end surface of the reduction box body, the gap between the wheels and the end surface of the reduction box body is low due to the same type of structure, and the rotary inertia generated when the wheels rotate on the ground can cause dust, impurities, scrap iron and other foreign matters to enter, so that the oil seal and the inner gear ring can be damaged for a long time, and in addition, the double-.

In conclusion, the device has the advantages of simple structure and convenience in disassembly, and is particularly suitable for the technical field of driving wheel mechanisms.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of a driving wheel assembly.

Fig. 2 is a schematic sectional view of the reduction case.

FIG. 3 is a cross-sectional schematic view of the drive wheel assembly.

Figure 4 is a schematic cross-sectional view of a wheel.

Fig. 5 is a schematic view of the structure of the wheel.

Fig. 6 is a schematic structural view of the driving motor.

Fig. 7 is a schematic cross-sectional view of a drive motor.

Fig. 8 is a sectional view of the ring gear.

Fig. 9 is a structural schematic diagram of the ring gear.

Fig. 10 is a schematic structural view of the transmission assembly.

FIG. 11 is a first schematic structural diagram of the reduction box.

Fig. 12 is a second schematic structural view of the reduction box body.

Fig. 13 is a third schematic structural view of the reduction case.

Fig. 14 is an enlarged partial schematic view at a of fig. 3.

Figure 15 is a schematic view of the construction of the wheel and circlip assembly.

Fig. 16 is a partially enlarged schematic view at B of fig. 3.

Detailed Description

The technical scheme in the embodiment of the invention is clearly and completely explained by combining the attached drawings.

Example one

As shown in fig. 1, 2 and 3, a driving wheel assembly includes a reduction box 1, a transmission component 2 installed on the reduction box 1, a driving motor 3 disposed in the reduction box 1 and in transmission connection with the transmission component 2 in a matching manner, and wheels 4 rotatably installed outside the driving motor 3, wherein the reduction box 1 includes a lateral installation portion 1a and a transverse installation portion 1b connected to the top of the lateral installation portion 1a, an installation space 100 is formed between the lateral installation portion 1a and the transverse installation portion 1b, and the reduction box further includes an inner gear ring 5 in transmission in matching with the transmission component 2, two side end surfaces of the inner gear ring 5 respectively abut against the transmission component 2 and the wheels 4, and an outer circumferential surface of the inner gear ring 5 abuts against an inner wall of the wheels 4; the wheel 4 is rotatably arranged on the driving motor 3 through a bearing 6; the wheel 4 comprises a wheel core 41 and a wheel rim 42, a convex part 414 is annularly arranged on the inner wall of the wheel core 41, and two side surfaces of the convex part 414 are respectively abutted against the outer end surface of the inner gear ring 5 and the bearing 6; the outer circumferential surface of the driving motor 3 is of a step-shaped structure, and the bearing 6 is arranged at the position of the maximum diameter of the driving motor 3; a circlip assembly 7 is engaged between the hub 41 and the drive motor 3, and the circlip assembly 7 is provided on the other side of the bearing 6 with respect to the ring gear 5.

In this embodiment, directly establish the wheel cover outside driving motor 3 through setting up bearing 6, set up ring gear 5 and circlip subassembly 7 side by side in the both sides of bearing 6 and all settle with wheel 4 again, and then realize dismantling the during operation, get off circlip subassembly 7 on the motor, can dismantle the change with bearing 6, wheel 4 and ring gear 5, during the installation simultaneously, install ring gear 5 and bearing 6 on wheel 4 earlier, again direct mount on driving motor 3, and then realize the installation accuracy.

Further, as shown in fig. 3, the bearings 6 are provided in a group and located at the middle position of the wheel 4.

In the embodiment, the bearing 6 is a single-bearing centering support, so that the friction force of starting and walking and pivot steering of the vehicle is small and stable, the mechanical loss is reduced, the motor current is effectively reduced, the battery energy consumption is reduced, and the endurance mileage is improved.

Further, as shown in fig. 4 and 5, a first limiting groove 411 for mounting the inner gear ring 5, a second limiting groove 412 for mounting the bearing 6, and a third limiting groove 413 for mounting the circlip assembly 7 are further sequentially formed on the inner wall of the wheel core 41;

the protruding portion 414 is located between the first limiting groove 411 and the second limiting groove 412, a plurality of groups of first connecting pieces 41515 for connecting the ring gear 5 with the protruding portion 414 are arranged on the protruding portion 414, and the plurality of groups of first connecting pieces 41515 are circumferentially and uniformly distributed on one side of the protruding portion 414.

It should be noted that the outer edge of the rim 12 is of an arc-shaped structure, so that the friction force of the vehicle during starting and traveling and pivot steering is small and stable, and the mechanical loss is reduced.

In addition, the first connecting piece 415 is a screw and positioning pin combined connection mode; the fastening connection mode of the wheel 4 and the inner gear ring 5 is a screw and a positioning pin, and the wheel has large wheel-side torque due to frequent forward and reverse rotation of the final output end, so that the shearing force of the wheel to the screw can be reduced.

Further, as shown in fig. 6 and 7, the outer circumferential surface of the driving motor 3 is provided with a first step portion 31, a second step portion 32, a third step portion 33, and a fourth step portion 34 in this order along the axial direction of the side mounting portion 1 a;

the first step part 31 is provided with an avoiding square groove 311 matched with the output end of the transmission assembly 2, and the second step part 32 is provided with an installation ring groove 321 matched with the thickness of the elastic retainer ring assembly 7;

the diameter of the first step 31 is R1, the diameter of the second step 32 is R2, the diameter of the third step 33 is R3, and the diameter of the fourth step 34 is R4; r2 > R3 > R1 > R4.

In this embodiment, the bearing 6 is sleeved on the outside of the second step portion 32, that is, the bearing 6 is sleeved on the maximum outer diameter of the driving motor 3, thereby facilitating the direct detachment of the bearing from the motor.

In addition, the bearing and the circlip assembly of the present invention are both mounted on the second step portion 32, and the circlip assembly tightly abuts against the outer side of the bearing.

Further, as shown in fig. 8 and 9, the ring gear 5 has a stepped structure and includes a connecting portion 51 and a transmission portion 52 that are integrally formed, and a ring gear 53 is disposed on inner walls of the connecting portion 51 and the transmission portion 52;

the connecting portion 51 abuts against the side wall of the protruding portion 414.

It should be noted that the width of the gear ring is not smaller than the width of the transmission part, and the structure of the gear ring is matched with the secondary driving gear.

In this embodiment, one end of the ring gear 5 abuts against the side wall of the protruding portion 414, and the other end abuts against the rotating bearing on the transmission shaft 21, so that the ring gear 5 is accurately mounted and tightly combined with the wheel, and further, the structure is stable, and the mounting error is small.

Further, as shown in fig. 10, the transmission assembly 2 includes a transmission shaft 21 rotatably disposed on the reduction gear box 1 and disposed in parallel with the motor shaft 30 of the driving motor 3, and a primary driven gear 22 and a secondary driving gear 23 mounted on the transmission shaft 21, the primary driven gear 22 is engaged and connected with a primary driving gear 24 mounted on the motor shaft 30, and the secondary driving gear 23 is structurally matched and engaged and connected with the toothed ring 53 of the ring gear 5.

In this embodiment, through setting up transmission assembly 2, and adjust driving motor 3's rotational speed, and then realize the normal rotation of wheel 4, in detail, one-level driving gear 24 drives one-level driven gear 22 and rotates, then one-level driven gear 22 drives second grade driving gear 23 and rotates, then second grade driving gear 23 drives ring gear 53 and rotates, last ring gear 53 drives wheel 4 and rotates, in order to improve transmission stability, be connected with bearing a between one-level driven gear 22 and the second grade driving gear 23 and fix a position.

It should be noted that the secondary driving gear 23 is mounted on the transmission shaft 21 at a position outside the first step 31 of the motor. A grease cavity is formed between the end part of the transmission shaft 21 and the end surface of the bearing, so that the lubricating effect and the operation stability are improved.

Further, as shown in fig. 11, an upper shaft hole 11 and a lower shaft hole 12 are provided on the lateral mounting portion 1a, the central line of which is located on the same vertical plane, the lateral mounting portion 1a is provided with an annular inner gear ring positioning portion 13 and an annular driving motor supporting portion 14 in a way of axially protruding on one surface facing the transverse portion, the inner gear ring positioning portion 13 and the driving motor supporting portion 14 are coaxially arranged with the lower shaft hole 12, the upper portion of the driving motor supporting portion 14 is provided with a notch 15, the upper shaft hole 11 is correspondingly located in the center of the notch 15, the driving motor 3 is located in the driving motor supporting portion 14 and is fixedly connected with the lateral mounting portion 1a through a screw, and the output shaft of the driving motor 3 penetrates through the lower shaft hole 12 and penetrates out from.

It should be noted that, the lateral mounting portion 1a is located outside the side plate 10 and is uniformly provided with a plurality of groups of mounting holes for mounting the motor; the screw sets up in the mounting hole and adopts external design, but quick assembly disassembly changes the motor, and the screw equipartition that tradition used arranges in the reducing gear box, dismantles to change the motor and must tear earlier and tear down brake, reducing gear box left side lid back and just can dismantle the screw and change the motor.

In addition, grease is filled among the inner gear ring positioning part 13, the driving motor supporting part 14 and the inner gear ring, and the distance between the inner gear ring and the inner gear ring positioning part 13 is 1-2 mm.

Further, as shown in fig. 12 and 13, the lateral mounting portion 1a further includes a side plate 10 which is arranged opposite to one side of the lateral mounting portion 1b and is hollow inside, an upper mounting groove 16 and a lower mounting groove 17 which are communicated with each other and coaxially arranged with the upper shaft hole 11 and the lower shaft hole 12 one by one are arranged on the side surface of the side plate 10, a sealing blank cap 101 is arranged outside the upper mounting groove 16, and a brake 102 is arranged outside the lower mounting groove 17;

the upper end of the side plate 10 is an open type visible window 103; the side plate 10 is also provided with an oil cup 104.

In the embodiment, the upper end of the side plate 10 is designed as an open type visible window, the visible window is made of a light-transmitting visible resin material, and the lubricating condition of lubricating grease in the reduction gearbox and the abrasion condition of gears can be conveniently observed by using a portable light source; in addition, the oil cup design on the side plate 4 can be matched with an open visual window, and the conditions of dry lubricating oil and the like discovered after observation can be added in time through the oil cup, so that the abrasion caused by dry friction transmission of the gear is avoided.

It should be noted that the side plate 10 is located below the lower mounting groove 17 and has a Y-shaped structure, so that the positioning and quick mounting of the brake and the heat dissipation of the brake are facilitated, the brake is mounted, and the working automation degree of the forklift driving wheel is high.

In addition, through setting up side direction installation department 1a and horizontal installation department 1b integrated into one piece for install drive assembly 2 in last mounting groove 16 and install the initiative tooth 24 on the motor in mounting groove 17 down and carry out accurate location, reduce processing and assembly error, improved production efficiency, guaranteed driven stability simultaneously, and then stability when guaranteeing the transmission of fork truck drive wheel.

It is worth emphasizing that a primary driven gear 22 mounting cavity is formed between the upper mounting groove 16 and the lateral mounting portion, and a primary driving gear 24 mounting cavity is formed between the lower mounting groove 17 and the lateral mounting portion.

As shown in fig. 7, the circlip assembly 7 includes a shaft circlip 71 and a hole circlip 72, and the shaft circlip 71 abuts against the end surface of the bearing 6.

In this embodiment, accomplish through setting up circlip subassembly 7 to wheel 4 and driving motor 3 between sealed work, accomplish the spacing work to bearing 6 simultaneously, and then guarantee the driven stability of wheel.

Example two

As shown in fig. 14, in which the same or corresponding components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, only the points of difference from the first embodiment will be described below for the sake of convenience. The second embodiment is different from the first embodiment in that:

further, as shown in fig. 14, a double-lip framework oil seal 105 is arranged between the reduction gearbox body 1 and the inner gear ring 5;

and dust rings 106 are arranged among the reduction box body 1, the inner gear ring 5 and the wheels 4.

In this embodiment, reduction box 1 and ring gear 5, wheel 4 department adopts the double seal design of two lip skeleton oil seals and dust ring, dust ring 106 is installed in the groove of wheel 4 and ring gear 5, be non-contact (not increase friction and produce the energy consumption) with reduction box 1 terminal surface, because the sealed ground clearance of the same type structure is low, the inertia that wheel 4 produced when ground rotation in addition can make dust, impurity, foreign matter such as iron fillings get into, can damage oil blanket and ring gear for a long time, double seal design can effectively block being drawn into of large granule foreign matter and reduce these risks in addition.

In the description of the present invention, it is to be understood that the terms "front-back", "left-right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or component must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the invention.

Of course, in this disclosure, those skilled in the art will understand that the terms "a" and "an" should be interpreted as "at least one" or "one or more," i.e., in one embodiment, a number of an element may be one, and in another embodiment, a number of the element may be plural, and the terms "a" and "an" should not be interpreted as limiting the number.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art in light of the technical teaching of the present invention should be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A driving wheel assembly comprises a reduction box body (1), a transmission component (2) arranged on the reduction box body (1), a driving motor (3) arranged in the reduction box body (1) and in matching transmission connection with the transmission component (2), and wheels (4) rotatably arranged outside the driving motor (3), the reduction box body (1) comprises a lateral mounting part (1 a) and a transverse mounting part (1 b) connected to the top of the lateral mounting part (1 a), a mounting space (100) is formed between the lateral mounting part (1 a) and the transverse mounting part (1 b), characterized in that the device also comprises an inner gear ring (5) which is matched with the transmission component (2) for transmission, the end surfaces of two sides of the inner gear ring (5) are respectively abutted against the transmission component (2) and the wheel (4), and the outer circumferential surface of the inner gear ring (5) is abutted against the inner wall of the wheel (4); the wheel (4) is rotatably arranged on the driving motor (3) through a bearing (6); the wheel (4) comprises a wheel core (41) and a wheel rim (42), a bulge (414) is annularly arranged on the inner wall of the wheel core (41), and two side faces of the bulge (414) are respectively abutted against the outer end face of the inner gear ring (5) and the bearing (6); the outer circumferential surface of the driving motor (3) is of a stepped structure, and the bearing (6) is arranged at the position of the maximum diameter of the driving motor (3); a circlip assembly (7) is clamped between the wheel core (41) and the driving motor (3), and the circlip assembly (7) is arranged on the other side of the bearing (6) relative to the inner gear ring (5);

the outer circumferential surface of the driving motor (3) is sequentially provided with a first step part (31), a second step part (32), a third step part (33) and a fourth step part (34) along the axial direction of the lateral mounting part (1 a);

an avoiding square groove (311) matched with the output end of the transmission assembly (2) is formed in the first step part (31), and an installation ring groove (321) matched with the thickness of the elastic retainer ring assembly (7) is formed in the second step part (32);

the diameter of the first step (31) is R1, the diameter of the second step (32) is R2, the diameter of the third step (33) is R3, and the diameter of the fourth step (34) is R4; r2 > R3 > R1 > R4.

2. A driving wheel assembly according to claim 1, characterized in that said bearings (6) are arranged in a set and located in the middle position of said wheel (4).

3. A driving wheel assembly according to claim 1, wherein the inner wall of the wheel core (41) is further provided with a first limiting groove (411) for mounting the inner gear ring (5), a second limiting groove (412) for mounting the bearing (6), and a third limiting groove (413) for mounting the circlip component (7) in sequence;

the protruding portion (414) is located between the first limiting groove (411) and the second limiting groove (412), a plurality of groups of first connecting pieces (415) used for connecting the inner gear ring (5) with the protruding portion (414) are arranged on the protruding portion (414), and the plurality of groups of first connecting pieces (415) are circumferentially and uniformly distributed on one side of the protruding portion (414).

4. A driving wheel assembly according to claim 3, characterized in that said inner gear ring (5) is of a stepped structure and comprises a connecting portion (51) and a transmission portion (52) which are integrally formed, and a gear ring (53) is arranged on the inner walls of said connecting portion (51) and said transmission portion (52);

the connecting part (51) is abutted against the side wall of the bulge part (414).

5. A driving wheel assembly according to claim 4, wherein said transmission assembly (2) comprises a transmission shaft (21) rotatably disposed on said reduction box (1) and disposed in parallel with a motor shaft (30) of said driving motor (3), and a primary driven gear (22) and a secondary driving gear (23) mounted on said transmission shaft (21), said primary driven gear (22) is in meshing transmission connection with a primary driving gear (24) mounted on said motor shaft (30), said secondary driving gear (23) is in structural adaptation with and in meshing transmission connection with a toothed ring (53) of said inner toothed ring (5).

6. A driving wheel assembly according to claim 1, wherein the lateral mounting portion (1 a) is provided with an upper axle hole (11) and a lower axle hole (12) whose central lines are located on the same vertical plane, one surface of the lateral mounting portion (1 a) facing the lateral mounting portion (1 b) is provided with an annular inner gear ring positioning portion (13) and an annular driving motor supporting portion (14) in a protruding manner in the axial direction, the inner gear ring positioning portion (13) and the driving motor supporting portion (14) are coaxially arranged with the lower axle hole (12), and the upper portion of the driving motor supporting portion (14) is provided with a notch (15).

7. The driving wheel assembly as set forth in claim 1, wherein the lateral mounting portion (1 a) further comprises a side plate (10) which is arranged opposite to one side of the transverse mounting portion (1 b) and is hollow inside, an upper mounting groove (16) and a lower mounting groove (17) which are communicated with each other and coaxially arranged with the upper shaft hole (11) and the lower shaft hole (12) one by one are arranged on the side surface of the side plate (10), a sealing blank cap (101) is arranged outside the upper mounting groove (16), and a brake (102) is arranged outside the lower mounting groove (17);

the upper end of the side plate (10) is provided with an open type visible window (103); the side plate (10) is also provided with an oil cup (104).

8. A driving wheel assembly according to claim 1, characterized in that a double-lip framework oil seal (105) is arranged between the reduction box body (1) and the inner gear ring (5);

dust rings (106) are arranged among the reduction box body (1), the inner gear ring (5) and the wheels (4).

9. A drive wheel assembly according to claim 1, characterized in that the circlip assembly (7) comprises a circlip for shaft (71) and a circlip for bore (72), the circlip for shaft (71) abutting against the end face of the bearing (6).