Electric cart driving wheel with built-in gear motor assembly

Abstract

The utility model relates to an electric cart driving wheel with a built-in gear motor assembly, which comprises a wheel casing, the gear motor assembly and a wheel shaft, the gear motor assembly is arranged in the wheel casing, the wheel shaft penetrates through the wheel casing and is rotatably connected with the wheel casing, the gear motor assembly comprises a casing, a motor and an output wheel, the output wheel is arranged in the casing, and the motor is arranged in the casing. The wheel shaft penetrates through the shell and the output wheel, the wheel shaft is fixed to the shell and rotationally connected with the output wheel, the motor is fixed to the shell and drives the output wheel to rotate, and the output wheel is further connected with the wheel shell and drives the wheel shell to rotate. The integral structure is simplified, the manufacturing, processing and assembling difficulty is reduced, the noise is reduced, and the cost is reduced; meanwhile, the size limitation of the thickness and the diameter of the driving wheel can be reduced through the structure, and the appearance coordination and the wheel attractiveness of the whole cart can be guaranteed under the condition that normal folding of the cart is not affected.

Description

Technical Field

[0001] This utility model belongs to the technical field of electric trolley accessory structure, and in particular relates to an electric trolley drive wheel with a built-in geared motor assembly. Background Technology

[0002] Outdoor electric assisted trolleys effectively help people transport goods with less effort. Within the trolley's carrying capacity, they allow people to pull more and heavier items. This effort-saving capability relies heavily on the geared motor assembly, one of its core components. While a typical DC motor itself doesn't have a large torque, a reducer (gear, worm gear, pulley, etc.) enables the motor to output a high-torque, low-speed force, thus driving the trolley wheels to rotate under a certain load, achieving the goal of reducing the effort required to pull the trolley.

[0003] Existing geared motor assemblies, with the reducer and motor mostly arranged axially, have a relatively long overall length. They are generally mounted outside the wheels, protruding a lot, which is unsightly and affects the use and folding of the stroller. If they were to be installed inside the wheels, the designed electric drive wheels for outdoor strollers would be very thick (wide) or very large (large diameter), affecting the appearance and overall coordination of the stroller, and even affecting the folding of the stroller (a bundled stroller may not be able to fold completely) and daily use.

[0004] In addition, if the existing geared motor assembly is placed directly inside the wheel to drive the wheel to rotate, one method is to make the output shaft of the geared motor assembly coincide with the wheel axle. This splits the wheel axle in two, and it is also necessary to ensure the coaxiality of the wheel axle and the output shaft of the geared motor, which increases the machining accuracy and assembly difficulty, and increases the cost. The second method is to make the output shaft of the geared motor assembly parallel to the wheel axle, but the output shaft and the wheel axle do not interfere with each other. In this case, an additional transmission device (such as a pair of gears) needs to be designed to transmit power to the wheel. This method increases the number of parts, increases assembly, increases costs, and the additional transmission device affects stability, transmission efficiency, and increases noise.

[0005] Meanwhile, placing the existing geared motor inside the wheel, on one side of the wheel axle, means that since the wheel needs to rotate, the portion of the wheel circumference occupied by the geared motor cannot contain any other wheel structures, otherwise it will cause interference. This results in a significant waste of space and low space utilization. Utility Model Content

[0006] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide an electric trolley drive wheel with a built-in geared motor assembly. The drive wheel has a simple structure and a small overall size.

[0007] To achieve the above-mentioned objectives, this utility model adopts the following technical solution:

[0008] An electric trolley drive wheel with a built-in geared motor assembly includes a wheel housing, a geared motor assembly, and a wheel axle. The geared motor assembly is located inside the wheel housing, and the wheel axle passes through the wheel housing and is rotatably connected to the wheel housing. The geared motor assembly includes a housing, a motor, and an output wheel. The output wheel is located inside the housing, and the wheel axle passes through the housing and the output wheel. The wheel axle is fixed to the housing and is rotatably connected to the output wheel. The motor is fixed to the housing and drives the output wheel to rotate. The output wheel is also connected to the wheel housing and drives the wheel housing to rotate.

[0009] As a preferred embodiment, the motor is located on the radial side of the output wheel, one end of the motor shaft is provided with a small gear, the output wheel is a large gear, and the small gear directly or indirectly meshes with the large gear for transmission.

[0010] As a preferred embodiment, multiple reduction gears are provided between the large gear and the small gear, and the multiple reduction gears mesh radially along the motor or output wheel and are stacked along the length direction of the motor.

[0011] As a preferred embodiment, the motor is located on the radial side of the output wheel, one end of the motor shaft is provided with a small pulley, the output wheel is a large pulley, or a large pulley is provided on one side of the output wheel, and the small pulley and the large pulley are driven by a belt or a synchronous belt.

[0012] As a preferred embodiment, the output wheel is a worm gear, and a worm is also rotatably provided inside the housing. The worm is driven by the worm wheel, and one end of the worm is driven by the motor shaft through a gear, chain, belt, or synchronous belt.

[0013] As a preferred embodiment, the motor is fixed to the housing on one side of the worm gear in the radial direction, and the motor shaft is parallel to the worm gear.

[0014] As a preferred embodiment, a transfer component is rotatably connected to the axle between the output wheel and the wheel housing, and the output wheel transmits power to the wheel housing through the transfer component.

[0015] As a preferred embodiment, at least one side of the output wheel is provided with a connecting groove, and the adapter or wheel housing is provided with a boss that cooperates with the connecting groove.

[0016] As a preferred embodiment, the housing includes a bracket and bracket housing A and bracket housing B fixed on both sides of the bracket. The bracket, bracket housing A or bracket housing B is provided with through holes for connecting grooves or bosses to pass through, and the small holes are connected to the through holes.

[0017] As a preferred embodiment, the output wheel is also provided with a through hole for the wheel axle to pass through. The through hole is located in the connecting groove, and the bracket, bracket housing A or bracket housing B are also provided with small holes at positions corresponding to the through hole.

[0018] As a preferred embodiment, one side of the housing is also provided with a fixing hole for fixing the housing to the axle.

[0019] As a preferred embodiment, the wheel housing includes an upper wheel housing, a tire cover, and a lower wheel housing. The upper wheel housing and the lower wheel housing are interlocked, snapped together, or fixed by bolts. The tire cover is fitted and fixed on the side wall formed by the upper wheel housing and the lower wheel housing.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This invention simplifies the overall structure, reduces manufacturing and assembly difficulty, reduces noise, and lowers costs by placing the geared motor assembly inside the wheel housing, passing the wheel axle through the geared motor assembly, and using the output wheel in the geared motor assembly to drive the wheel housing. At the same time, the structure of this invention can reduce the size limitations of the drive wheel's thickness and diameter, and can ensure the overall appearance coordination and wheel aesthetics of the trolley without affecting the normal folding of the trolley. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is an exploded structural diagram of Embodiment 1 of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the geared motor assembly according to Embodiment 1 of this utility model;

[0026] Figure 4 This is an exploded structural diagram of the geared motor assembly of Embodiment 1 of this utility model;

[0027] Figure 5 This is a schematic diagram of the output wheel of the geared motor assembly in Embodiment 1 of this utility model;

[0028] Figure 6 This is a structural schematic diagram of the geared motor assembly of Embodiment 1 of this utility model from another angle;

[0029] Figure 7 This is an exploded structural diagram of Embodiment 2 of this utility model;

[0030] Figure 8 This is a schematic diagram of the structure of the geared motor assembly and part of the wheel housing in Embodiment 2 of this utility model.

[0031] The attached figures are labeled as follows: 1. Upper wheel housing; 2. Tire skin; 3. Lower wheel housing; 4. Gear motor assembly; 5. Adapter component; 6. Axle; 41. Bracket housing A; 42. Bracket; 43. Motor; 44. Bracket housing B; 45. Output wheel; 451. Through hole; 452. Connecting groove; 453. Small hole; 454. Fixing hole; 8. Worm gear. Detailed Implementation

[0032] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example 1

[0039] like Figure 1 and Figure 2 As shown, an electric trolley drive wheel with a built-in geared motor assembly includes a wheel housing, a geared motor assembly 4, and a wheel axle 6. The wheel housing includes an upper wheel shell 1, a tire cover 2, and a lower wheel shell 3. The upper wheel shell 1 and the lower wheel shell 3 are interlocked, snapped together, or fixed by bolts. The tire cover 2 is fitted and fixed to the side wall formed by the upper wheel shell 1 and the lower wheel shell 3. The geared motor assembly 4 is located inside the wheel housing. The wheel axle 6 passes through the wheel housing and is rotatably connected to it. When the two ends of the wheel axle 6 protrude from the wheel housing and are assembled into a trolley, they are fixed in place.

[0040] like Figure 3 and Figure 4 As shown, the geared motor assembly 4 includes a housing, a motor 43, and an output wheel 45. The output wheel 45 is located inside the housing. The wheel axle 6 passes through the housing and the output wheel 45, and the wheel axle 6 is fixed to the housing. The wheel axle 6 is rotatably connected to the output wheel 45. The motor 43 is located on the radial side of the output wheel 45. The motor 43 is fixed to the housing and drives the output wheel 45 to rotate. The output wheel 45 is also connected to a wheel housing and drives the wheel housing to rotate.

[0041] The housing includes a bracket 42 and bracket housings A41 and B44 fixed on both sides of the bracket 42. One side of the output wheel 45 is rotatably mounted on the bracket via a bearing. To maintain the stability of the output wheel's rotation, the other side of the output wheel can also be rotatably connected to bracket housing A41 or bracket housing B44 via a bearing. At least one side of the output wheel 45 is provided with a connecting groove 452 (e.g., ...). Figure 5 As shown, the wheel housing has a boss that mates with the connecting groove 452. The bracket 42, bracket housing A41, or bracket housing B44 has a through hole through which the connecting groove 452 or the boss passes. The above structure allows the driving force to be transmitted from the output wheel 45 of the geared motor assembly to the wheel housing through the mating boss and the connecting groove, so that the wheel can rotate at a certain speed and with a certain torque.

[0042] The output wheel 45 is also provided with a through hole 451 for the wheel axle 6 to pass through. The through hole 451 is located in the connecting groove 452. The bracket 42, bracket housing A41 or bracket housing B44 are also provided with small holes 453 at positions corresponding to the through hole 451. The small holes 453 communicate with the through hole 451. One side of the housing is also provided with a fixing hole 454 for fixing the housing to the wheel axle 6 (e.g., Figure 6 (As shown).

[0043] The above structure keeps the housing and motor inside the wheel stationary, and the transmission mechanism is also covered by the housing. Sound-absorbing / sound-insulating materials can be added or wrapped around the housing of the geared motor assembly, which makes full use of space and reduces noise.

[0044] The housing in this application can be a three-layer structure as described above, or a two-layer structure. The installation positions of the output wheel, through hole, through hole 451 and small hole 453 can be adjusted accordingly. As long as the through hole, through hole 451 and small hole 453 are on the same straight line, it is convenient for the wheel axle to pass through. At the same time, the housing is provided with a channel that allows the output wheel to connect with the wheel housing, which can meet the installation requirements.

[0045] The output component of the geared motor assembly of this utility model is not the traditional geared motor output shaft. Instead, it uses a through hole (to avoid the wheel axle (drive wheel rotation shaft)) + groove (to cooperate with the intermediate transmission component / transfer component / wheel housing) to replace the output shaft of the transmission reducer. This structure makes it easy to disassemble the components without affecting stability and strength, and is more conducive to installation and maintenance. This geared motor assembly adapts to the internal space of the wheel and is more suitable as an internal drive device for electric drive wheels of outdoor strollers.

[0046] The transmission methods between the motor and the output wheel include, but are not limited to, the following two:

[0047] 1. One end of the shaft of the motor 43 is provided with a small gear, and the output wheel 45 is a large gear. The small gear directly or indirectly meshes with the large gear for transmission. Multiple reduction gears are provided between the large gear and the small gear, and the multiple reduction gears mesh radially along the motor 43 or the output wheel 45, and are stacked along the length of the motor. The number and gear ratio of the reduction gears can be set according to the corresponding reduction ratio to be achieved.

[0048] 2. The motor 43 has a small pulley at one end of its shaft and the output wheel 45 is a large pulley, or the output wheel 45 has a large pulley on one side and the small pulley and the large pulley are driven by a belt or synchronous belt.

[0049] In the above structure, the bracket housing A41, bracket 42 and bracket housing B44 are locked together to enclose the internal transmission parts and form a certain seal. This can prevent the internal lubricating oil from being thrown out into the wheel when the transmission parts rotate, and can also provide some sound insulation.

[0050] A connecting component 5 is rotatably connected to the axle 6 between the output wheel 45 and the wheel housing. The connecting component 5 has a boss that mates with the connecting groove 452. The output wheel 45 transmits power to the wheel housing (e.g., ...) through the connecting component 5. Figure 2 (as shown); furthermore, in addition to power transmission, its adapter 5 can also be equipped with clutch, speed measuring and other devices.

[0051] This invention utilizes a single-stage gear transmission to move the reducer to the side of the motor, allowing the gearbox and motor to be arranged side-by-side (the reducer is radially distributed within the motor), significantly reducing the overall length of the geared motor assembly. Existing geared motor assemblies have the reducer located at the front end of the motor output shaft, axially forward, with a length equal to the motor length + reducer length + reducer output shaft length. This invention, however, distributes the reducer radially around the motor, making efficient use of the wheel's radial space. Its length is equal to the motor length (43) plus the thickness of the support housing (A41) (the thickness of the support housing (41) is much smaller than the reducer's own thickness). This design significantly reduces the length of the geared motor assembly. Placing it inside the wheel further reduces the wheel's thickness. Example 2

[0052] The general structure of Embodiment 1 is the same as that of Embodiment 2, the difference being that the output wheel structure in the geared motor assembly is slightly different, and the motor arrangement direction is also slightly different. The specific structure is as follows: Figure 7 and Figure 8 As shown:

[0053] The output wheel 45 is a worm gear, and a worm 8 is also rotatably mounted inside the housing. The worm 8 drives the worm gear, and one end of the worm 8 is connected to the shaft of the motor 43 via gears, chains, belts, or synchronous belts. The motor 43 is fixed to the housing on one radial side of the worm 8, and the shaft of the motor 43 is parallel to the worm 8.

[0054] The aforementioned geared motor assembly uses a worm gear reducer. The worm gear reducer is placed on the side of the motor (distributed radially around the motor) through a single-stage gear. This method can also shorten the length of the worm gear reducer motor in the radial (diameter direction) direction of the wheel, greatly reducing the impact on the minimum diameter of the wheel.

[0055] This utility model's geared motor assembly rationally utilizes the space inside the wheel for layout, reducing unnecessary parts or additional transmission components, simplifying manufacturing and assembly. The components are easily detachable for assembly and maintenance. It optimizes the layout and output component design of traditional geared motor assemblies, reducing limitations on the overall size of the drive wheel. This allows for a smaller overall drive wheel with a better appearance, increasing the overall trolley's coordination. The geared motor assembly is better integrated into the trolley wheel, making it more suitable for use as an in-wheel electric drive device and for electric drive wheels with in-wheel drive, thus better suited for outdoor electric-assisted trolleys. Furthermore, the smaller wheel size reduces its space occupation, consequently reducing the overall trolley space, minimizing footprint and packaging costs.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. An electric trolley drive wheel with a built-in geared motor assembly, comprising a wheel housing, a geared motor assembly (4), and a wheel axle (6), wherein the geared motor assembly (4) is located inside the wheel housing, and the wheel axle (6) passes through the wheel housing and is rotatably connected to the wheel housing, characterized in that, The geared motor assembly (4) includes a housing, a motor (43), and an output wheel (45). The output wheel (45) is located inside the housing. The wheel axle (6) passes through the housing and the output wheel (45), and the wheel axle (6) is fixed to the housing. The wheel axle (6) is rotatably connected to the output wheel (45). The motor (43) is fixed to the housing and drives the output wheel (45) to rotate. The output wheel (45) is also connected to the wheel housing and drives the wheel housing to rotate.

2. The electric cart drive wheel with a built-in geared motor assembly according to claim 1, characterized in that, The motor (43) is located on the radial side of the output wheel (45). One end of the shaft of the motor (43) is provided with a small gear. The output wheel (45) is a large gear. The small gear directly or indirectly meshes with the large gear for transmission.

3. The electric cart drive wheel with a built-in geared motor assembly according to claim 2, characterized in that, Multiple reduction gears are provided between the large gear and the small gear. The multiple reduction gears mesh radially along the motor (43) or the output wheel (45) and are stacked along the length of the motor (43).

4. The electric cart drive wheel with a built-in geared motor assembly according to claim 1, characterized in that, The motor (43) is located on the radial side of the output wheel (45). One end of the shaft of the motor (43) is provided with a small pulley. The output wheel (45) is a large pulley, or a large pulley is provided on one side of the output wheel (45). The small pulley and the large pulley are driven by a belt or a synchronous belt.

5. The electric cart drive wheel with a built-in geared motor assembly according to claim 1, characterized in that, The output wheel (45) is a worm gear, and a worm (8) is also rotatably provided inside the housing. The worm (8) is driven by the worm gear, and one end of the worm (8) is driven by the shaft of the motor (43) through gears, chains, belts or synchronous belts.

6. The electric cart drive wheel with a built-in geared motor assembly according to claim 5, characterized in that, The motor (43) is fixed on the housing on one side of the radial direction of the worm (8), and the shaft of the motor (43) is parallel to the worm (8).

7. The electric cart drive wheel with a built-in geared motor assembly according to claim 1, characterized in that, A connecting component (5) is rotatably connected to the axle (6) between the output wheel (45) and the wheel housing, and the output wheel (45) transmits power to the wheel housing through the connecting component (5).

8. The electric cart drive wheel with a built-in geared motor assembly according to claim 7, characterized in that, The output wheel (45) has a connecting groove (452) on at least one side, and the adapter (5) or the wheel housing has a boss that cooperates with the connecting groove (452).

9. The electric cart drive wheel with a built-in geared motor assembly according to claim 8, characterized in that, The housing includes a bracket (42) and bracket housing A (41) and bracket housing B (44) fixed on both sides of the bracket (42). The bracket (42), bracket housing A (41) or bracket housing B (44) are provided with through holes for connecting grooves (452) or bosses to pass through.

10. The electric cart drive wheel with a built-in geared motor assembly according to claim 9, characterized in that, The output wheel (45) is also provided with a through hole (451) through which the wheel shaft (6) passes. The through hole (451) is located in the connecting groove (452). The bracket (42), bracket housing A (41) or bracket housing B (44) are also provided with small holes (453) at the positions corresponding to the through hole (451). The small holes (453) are connected to the through hole (451).

11. The electric cart drive wheel with a built-in geared motor assembly according to claim 1, characterized in that, One side of the housing is also provided with a fixing hole (454) for fixing the housing to the axle (6).

12. The electric cart drive wheel with a built-in geared motor assembly according to claim 1, characterized in that, The wheel housing includes an upper wheel housing (1), a tire cover (2), and a lower wheel housing (3). The upper wheel housing (1) and the lower wheel housing (3) are inserted into each other, snapped together, or fixed by bolts. The tire cover (2) is fitted and fixed on the side wall formed by the upper wheel housing (1) and the lower wheel housing (3).

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