Radially driven independent walking device and electric folding stroller

Abstract

The disclosure provides a radial driving independent walking device and an electric folding stroller. The radial driving independent walking device comprises a walking wheel and a driving mechanism. The driving mechanism comprises a driving assembly, a speed reduction assembly and a connecting assembly connected in sequence. The driving assembly is located in the radial direction of the walking wheel and is arranged close to the outer wall of the tire of the walking wheel. The speed reduction assembly is located in the axial direction of the walking wheel and is arranged close to the inner side hub surface of the walking wheel. The connecting assembly is arranged in the interior of the walking wheel. The driving assembly is used to drive the speed reduction assembly to move the connecting assembly, so that the connecting assembly drives the walking wheel to rotate. In this way, after the radial driving independent walking device is installed on the folding frame of the electric folding stroller, the folding space in the left-right direction can be provided for the folding frame, so that the electric folding stroller can be folded in the left-right direction, thereby improving the convenience of the electric folding stroller.

Description

Technical Field

[0001] This disclosure relates to the field of electric folding trolley technology, and more particularly to a radially driven independent walking device and an electric folding trolley. Background Technology

[0002] An electric folding stroller consists of a foldable frame, two independently driven rotating wheels, and two driven wheels. The design of the two independent drive mechanisms allows for differential movement between the two driving wheels and enables the stroller to fold. However, since existing independent drive mechanisms are usually axially oriented, they occupy a large amount of space in the left-right direction, resulting in the stroller only being able to fold forward and backward, but not left and right, thus affecting its portability. Summary of the Invention

[0003] This disclosure provides a radially driven independent walking device and an electric folding trolley to at least solve the problem in the prior art that electric folding trolleys cannot be folded in the left and right directions, thus affecting portability.

[0004] To achieve the above objectives, this disclosure provides the following technical solution: a radially driven independent walking device, comprising:

[0005] Wheels;

[0006] The drive mechanism includes a drive assembly, a reduction assembly, and a connecting assembly connected in sequence. The drive assembly is located radially on the traveling wheel and close to the outer wall of the tire of the traveling wheel. The reduction assembly is located axially on the traveling wheel and close to the inner hub surface of the traveling wheel. The connecting assembly is located inside the traveling wheel. The drive assembly is used to drive the reduction assembly to move the connecting assembly, so that the connecting assembly drives the traveling wheel to rotate.

[0007] In one embodiment, the drive assembly outputs power along the axial direction of the traveling wheel, and the deceleration assembly transmits power radially along the traveling wheel.

[0008] In one embodiment, the total width of the independent walking device along the axial direction of the walking wheel is less than or equal to 1.8 times the axial width of the walking wheel.

[0009] In one possible implementation, the connection component includes:

[0010] The first internal gear ring is coaxially arranged with the traveling wheel and connected to the inner wall of the traveling wheel;

[0011] The drive gear meshes with the first internal gear ring;

[0012] A connector, which is connected to the drive gear and the reduction assembly.

[0013] In one possible implementation, the connector includes:

[0014] A connecting shaft, comprising a drive shaft and a driven shaft, wherein the drive shaft and the driven shaft are coaxially arranged and connected to the reduction assembly, and the driven shaft is connected to the drive gear;

[0015] The tripping body includes a movable part and a fixed part. The movable part is slidably sleeved on the drive shaft along the axial direction of the drive shaft. The fixed part is connected to the driven shaft. The movable part is used to hold the fixed part in place.

[0016] In one embodiment, the fixing part has a slot, one sidewall of the slot is inclined and forms a pushing surface, and the movable part includes:

[0017] A sleeve ring is slidably sleeved on the drive shaft along the axial direction of the drive shaft;

[0018] A retaining claw is connected to the side of the sleeve ring facing the fixing part. The retaining claw is used to extend into the retaining groove and drive the fixing part to rotate. The sleeve ring is also used to push against the pushing surface to disengage from the retaining groove under the reaction force of the pushing surface.

[0019] In one possible implementation, the deceleration assembly includes:

[0020] First reduction gear;

[0021] The second reduction gear is coaxially arranged with and connected to the first reduction gear. The diameter of the second reduction gear is larger than that of the first reduction gear. Both the first reduction gear and the second reduction gear are rotatably connected to the walking wheel.

[0022] The third reduction gear is connected to the output shaft of the drive assembly and meshes with the second reduction gear;

[0023] The fourth reduction gear is connected to the connecting assembly and meshes with the first reduction gear.

[0024] In one possible implementation, the driving component includes:

[0025] A drive component is arranged radially along the traveling wheel and adjacent to the traveling wheel;

[0026] A planetary reducer is arranged radially along the travel wheel and adjacent to the travel wheel, and the planetary reducer protrudes axially from the travel wheel. The planetary reducer is connected to the drive component and the reduction assembly.

[0027] In one possible implementation, the connection component further includes:

[0028] The first dustproof plate is disposed inside the walking wheel and connected to the wheel hub of the walking wheel;

[0029] The second dustproof plate is disposed on opposite sides of the first dustproof plate on the first internal gear ring. The second dustproof plate is connected to the hub of the traveling wheel, and the connecting member is movably inserted through the second dustproof plate.

[0030] In one embodiment, the planetary speed reducer includes:

[0031] The second internal gear ring is connected to the drive component;

[0032] The gear assembly includes a gear disk, a plurality of planetary gears, and a linkage gear. The gear disk is coaxially disposed within the second internal gear ring. The plurality of planetary gears are circumferentially spaced about the axis of the gear disk and rotatably connected to the gear disk. A portion of each planetary gear protrudes radially from the gear disk and meshes with the second internal gear ring. The linkage gear is connected to the drive member and meshes with the plurality of planetary gears.

[0033] This disclosure also provides the following technical solution: an electric folding trolley, the electric folding trolley comprising:

[0034] The aforementioned radially driven independent walking device;

[0035] A folding frame, with two sets of radially driven independent walking devices arranged in the left-right direction and connected to the folding frame;

[0036] Two sets of driven wheels are spaced apart in the front-rear direction and connected to the folding frame.

[0037] In one possible implementation, the drive mechanisms of the two sets of radially driven independent walking devices are staggered.

[0038] In the aforementioned radially driven independent walking device, by arranging the drive assembly along the radial direction of the walking wheel, the connecting assembly along the axial direction of the walking wheel, and the deceleration assembly between the drive assembly and the connecting assembly and connected to the drive assembly and the connecting assembly respectively, the drive mechanism is arranged radially on the walking wheel. This effectively reduces the space occupied by the drive mechanism in the axial direction of the walking wheel. At the same time, by connecting the deceleration assembly to the connecting assembly and the drive assembly, torque transmission between the drive assembly and the connecting assembly can be achieved, while also decelerating and increasing the torque of the drive assembly. Thus, when the radially driven independent walking device is installed on the folding frame of the electric folding trolley, it can provide folding space in the left and right directions for the folding frame, so that the electric folding trolley can be folded in the left and right directions, thereby improving the convenience of the electric folding trolley.

[0039] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0040] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which:

[0041] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0042] Figure 1 A schematic diagram of the structure of a radially driven independent walking device according to an embodiment of the present disclosure is shown;

[0043] Figure 2 It shows Figure 1 Exploded view of the radially driven independent walking device;

[0044] Figure 3 It shows Figure 2 A structural schematic diagram of the connecting component, the deceleration assembly, and the drive assembly;

[0045] Figure 4 It shows Figure 3 Exploded view of the middle connector and the fourth reduction gear;

[0046] Figure 5 It shows Figure 4 Schematic diagram of the middle fixing part;

[0047] Figure 6 It shows Figure 4 A schematic diagram of the structure of the central activity section;

[0048] Figure 7 It shows Figure 3 A schematic diagram of the structure of the planetary speed reducer.

[0049] Explanation of the labels in the diagram:

[0050] In the diagram: 11. Walking wheel; 12. Drive mechanism; 121. Connecting assembly; 1211. First internal gear ring; 1212. Drive gear; 1213. Connecting piece; 1213a. Connecting shaft; 1213b. Drive shaft; 1213c. Driven shaft; 1213d. Release body; 1213e. Moving part; 1213f. Sleeve ring; 1213g. Holding claw; 1213h. Slot; 1213j. Pushing surface; 1213k. Fixing part; 1213m. Actuating groove; 1213n. Inclined surface; 121 3p, Actuating part; 1213q, Supporting part; 1214, First dustproof plate; 1215, Second dustproof plate; 122, Reduction assembly; 1221, First reduction gear; 1222, Second reduction gear; 1223, Third reduction gear; 1224, Fourth reduction gear; 123, Drive assembly; 1231, Drive component; 1232, Planetary reducer; 1232a, Second internal gear ring; 1232b, Gear assembly; 1232c, Gear disk; 1232d, Planetary gear; 1232e, Linkage gear. Detailed Implementation

[0051] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0052] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this disclosure can be achieved, and this is not limited herein.

[0053] 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 at least one of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] Please refer to the following: Figure 1 and 2This embodiment provides a radially driven independent walking device, which includes a walking wheel 11 and a drive mechanism 12. The drive mechanism 12 includes a drive component 123, a reduction component 122 and a connecting component 121 connected in sequence. The drive component 123 is located radially on the walking wheel 11 and close to the outer wall of the tire of the walking wheel 11. The reduction component 122 is located axially on the walking wheel 11 and close to the inner hub surface of the walking wheel 11. The connecting component 121 is located inside the walking wheel 11. The drive component 123 is used to drive the reduction component 122 to drive the connecting component 121 to move, so that the connecting component 121 drives the walking wheel 11 to rotate.

[0055] In the aforementioned radially driven independent walking device, by arranging the drive assembly 123 radially along the walking wheel 11, arranging the connecting assembly 121 axially along the walking wheel 11, and arranging the deceleration assembly 122 between the drive assembly 123 and the connecting assembly 121 and connecting the drive assembly 123 and the connecting assembly 121 respectively, the drive mechanism 12 is arranged radially on the walking wheel 11, effectively reducing the space occupied by the drive mechanism 12 in the axial direction of the walking wheel 11. At the same time, by connecting the deceleration assembly 122 to the connecting assembly 121 and the drive assembly 123, torque transmission between the drive assembly 123 and the connecting assembly 121 can be achieved, while also decelerating and increasing the torque of the drive assembly 123. Thus, after the radially driven independent walking device is installed on the folding frame of the electric folding cart, it can provide folding space in the left and right directions for the folding frame, so that the electric folding cart can be folded in the left and right directions, thereby improving the convenience of the electric folding cart.

[0056] It is understandable that the forward and backward directions, as well as the left and right directions, are the operator's visual directions when pushing the electric folding cart.

[0057] In some embodiments, the drive assembly 123 outputs power along the axial direction of the travel wheel 11 so that the drive assembly 123 is disposed close to the outer wall of the tire of the travel wheel 11, and the deceleration assembly 122 transmits power along the radial direction of the travel wheel 11 so that the deceleration assembly 122 is disposed close to the inner hub surface of the travel wheel 11.

[0058] In some embodiments, the total width of the independent walking device along the axial direction of the walking wheel 11 is less than or equal to 1.8 times the axial width of the walking wheel 11. The width of the independent walking device in this application is the sum of the width of the walking wheel 11 and the width of the reduction assembly 122, while the width of the conventional independent walking device is the sum of the width of the walking wheel 11, the width of the reduction assembly 122, and the width of the drive assembly 123, making the axial width of the independent walking device along the walking wheel 11 more than 2.8 times the axial width of the walking wheel 11.

[0059] Please see Figure 2In some embodiments, the connecting component 121 includes a first internal gear ring 1211, a drive gear 1212, and a connector 1213. The first internal gear ring 1211 is coaxially arranged with the walking wheel 11 and connected to the inner wall of the walking wheel 11. The drive gear 1212 meshes with the first internal gear ring 1211. The connector 1213 is connected to the drive gear 1212 and the reduction component 122.

[0060] Thus, the drive assembly 123 drives the connecting assembly 121 to rotate the connector 1213, which in turn drives the drive gear 1212 to rotate. This causes the drive gear 1212 to rotate with the meshing first internal gear ring 1211, thereby driving the travel wheel 11 to rotate. This achieves independent drive of the travel wheel 11. Furthermore, by meshing the larger diameter internal gear ring and the smaller diameter drive gear 1212, torque transmission can be achieved while also slowing down the travel wheel 11. At the same time, the connecting assembly 121 is offset from the axis of the travel wheel 11 to allow for axial clearance of the travel wheel 11, thereby further increasing the folding space of the folding frame in the left and right directions.

[0061] Please refer to the following: Figure 3 and Figure 4 In some embodiments, the connector 1213 includes a connecting shaft 1213a and a tripping body 1213d. The connecting shaft 1213a includes a drive shaft 1213b and a driven shaft 1213c. The drive shaft 1213b and the driven shaft 1213c are coaxially arranged and connected to the reduction assembly 122. The driven shaft 1213c is connected to the drive gear 1212. The tripping body 1213d includes a movable part 1213e and a fixed part 1213k. The movable part 1213e is slidably sleeved on the drive shaft 1213b. The fixed part 1213k is connected to the driven shaft 1213c. The drive shaft 1213b is also used to drive the movable part 1213e to rotate. The movable part 1213e is used to hold and connect to the fixed part 1213k.

[0062] Thus, when the electric folding trolley is driven forward by an electric force, the movable part 1213e is moved to the fixed part 1213k and engaged by an external force. This causes the movable part 1213e to rotate synchronously with the fixed part 1213k as the drive shaft 1213b rotates, thereby realizing the transmission connection between the drive shaft 1213b and the driven shaft 1213c. When the electric folding trolley is manually pushed forward, the movable part 1213e is moved away from the fixed part 1213k by an external force. This releases the engagement between the movable part 1213e and the fixed part 1213k and disengages the transmission between the drive shaft 1213b and the driven shaft 1213c. This ensures that the driven shaft 1213c is not interfered with by the drive shaft 1213b connected to the reduction assembly 122 and the drive assembly 123 when it rotates. As a result, the operator can switch between electric drive and manual push as needed, making the operation more convenient and efficient.

[0063] Understandably, when existing electric trolleys run out of power, are damaged and cannot be driven, or in work scenarios where electric assistance is not required, operators need to switch from electric drive to manual pushing. However, when manually pushing an electric trolley, the drive wheel drives the motor shaft to rotate through the reducer. The rotation of the motor shaft generates an unstable magnetic field and an unstable current inside the motor, which can easily lead to motor damage. Therefore, existing electric trolleys are not actually suitable for direct manual pushing, making their use inconvenient.

[0064] Please see Figure 3 In some embodiments, the fixed part 1213k is provided with a slot 1213h, and one side wall of the slot 1213h is provided with an inclined pushing surface 1213j. The movable part 1213e includes a sleeve ring 1213f and a holding claw 1213g. The sleeve ring 1213f is slidably sleeved on the drive shaft 1213b along the axial direction of the drive shaft 1213b. The holding claw 1213g is connected to the side of the sleeve ring 1213f facing the fixed part 1213k. The holding claw 1213g is used to drive the fixed part 1213k to rotate after extending into the slot 1213h. The sleeve ring 1213f is also used to push against the pushing surface 1213j so as to disengage from the slot 1213h under the reaction force of the pushing surface 1213j.

[0065] Please refer to the following: Figure 3 , Figure 4 and Figure 5In this embodiment, the movable part 1213e is provided with an actuating groove 1213m on the side opposite to the fixed part 1213k. A portion of the side wall of the actuating groove 1213m is inclined and forms an inclined surface 1213n, and the inclined surface 1213n is connected to the bottom wall of the actuating groove 1213m. The release body 1213d also includes an actuating part 1213p and a supporting part 1213q. The actuating part 1213p extends into the actuating groove 1213m and is used to push against the inclined surface 1213n. The supporting part 1213q is connected to the drive shaft 1213b and is used to press against the movable part 1213e, so that the frictional force generated between the supporting part 1213q and the movable part 1213e is greater than the frictional force generated between the movable part 1213e and the drive shaft 1213b.

[0066] Thus, when the electric folding trolley is manually pushed forward, the driven shaft 1213c drives the fixed part 1213k to rotate, causing the inclined pushing surface 1213j on the slot 1213h to move to abut against the holding claw 1213g. The pushing surface 1213j then pushes the holding claw 1213g to move axially along the drive shaft 1213b until it disengages from the slot 1213h, thereby releasing the transmission state between the drive shaft 1213b and the driven shaft 1213c. This prevents the drive shaft 1213b and the driven shaft 1213c from continuing to transmit torque, and makes the driven shaft 1213c unaffected by the drive assembly 123. This allows the drive shaft 1213b and the driven shaft 1213c to automatically separate during manual pushing operations, thereby further improving the convenience for the operator.

[0067] In this embodiment, the number of clamping claws 1213g and clamping slots 1213h are the same and there are multiple clamping claws 1213g. Multiple clamping claws 1213g are arranged circumferentially with the axis of the drive shaft 1213b as the axis. Multiple clamping claws are arranged circumferentially with the axis of the drive shaft 1213b as the axis. Each clamping claw 1213g is adapted to a corresponding clamping slot 1213h.

[0068] Please see Figure 3 In some embodiments, the reduction assembly 122 includes a first reduction gear 1221, a second reduction gear 1222, a third reduction gear 1223, and a fourth reduction gear 1224. The second reduction gear 1222 is coaxially arranged with and connected to the first reduction gear 1221. The diameter of the second reduction gear 1222 is larger than that of the first reduction gear 1221. Both the first reduction gear 1221 and the second reduction gear 1222 are rotatably connected to the walking wheel 11. The third reduction gear 1223 is connected to the output shaft of the drive assembly 123 and meshes with the second reduction gear 1222. The fourth reduction gear 1224 is connected to the connecting assembly 121 and meshes with the first reduction gear 1221.

[0069] Thus, by setting the first reduction gear 1221, the second reduction gear 1222, the third reduction gear 1223, and the fourth reduction gear 1224 that mesh with each other, the torque of the drive assembly 123 can be transmitted to the drive shaft 1213b of the connecting assembly 121. Moreover, the gear structure transmits torque more stably and reliably, and the transmission efficiency is higher. At the same time, the first reduction gear 1221 and the second reduction gear 1222 are set to different diameters so that a reduction gear structure can be formed between the first reduction gear 1221 and the second reduction gear 1222, so as to reduce the speed and increase the torque of the drive shaft 1213b.

[0070] Please see Figure 3 In some embodiments, the drive assembly 123 includes a planetary reducer 1232 and a drive member 1231. Both the planetary reducer 1232 and the drive member 1231 are radially disposed and adjacent to the traveling wheel 11, and the planetary reducer 1232 protrudes axially from the traveling wheel 11. The planetary reducer 1232 is connected to the drive member 1231 and the reduction assembly 122. Exemplarily, the drive member 1231 is a motor, and the planetary reducer 1232 is a planetary reducer.

[0071] Thus, the output shaft of the drive component 1231 is reduced in speed and torque is increased by the planetary reducer 1232 and then transmitted to the reducer, so as to improve the torque transmission efficiency. The planetary reducer 1232 and the reduction assembly 122 cooperate with each other to achieve the effect of multi-stage reduction transmission without occupying the axial space of the wheel.

[0072] Please see Figure 2 In some embodiments, the connecting assembly 121 further includes a first dustproof plate 1214 and a second dustproof plate 1215. The first dustproof plate 1214 is disposed inside the traveling wheel 11 and connected to the hub of the traveling wheel 11. The second dustproof plate 1215 and the first dustproof plate 1214 are disposed on opposite sides of the first internal gear ring 1211. The second dustproof plate 1215 is connected to the hub of the traveling wheel 11. The connecting member 1213 is movably inserted through the second dustproof plate 1215.

[0073] Thus, the first dustproof plate 1214 and the second dustproof plate 1215 seal the opposite sides of the first internal gear ring 1211 in the left and right directions to form a sealing structure, and to house and protect the first internal gear ring 1211 and the drive gear 1212, and prevent external dust from entering the meshing part of the first internal gear ring 1211 and the drive gear 1212, so as to affect the service life of the connecting assembly 121.

[0074] Please see Figure 6In some embodiments, the planetary reducer 1232 includes a second internal gear ring 1232a and a gear assembly 1232b. The second internal gear ring 1232a is connected to the drive member 1231. The gear assembly 1232b includes a gear disk 1232c, a plurality of planet gears 1232d, and a linkage gear 1232e. The gear disk 1232c is coaxially disposed within the second internal gear ring 1232a. The plurality of planet gears 1232d are circumferentially spaced about the axis of the gear disk 1232c and rotatably connected to the gear disk 1232c. A portion of each planet gear 1232d protrudes radially from the gear disk 1232c and meshes with the second internal gear ring 1232a. The linkage gear 1232e is connected to the drive member 1231 and meshes with the plurality of planet gears 1232d.

[0075] Thus, the drive component 1231 drives the linkage gear 1232e to rotate, causing the linkage gear 1232e to drive multiple planetary gears 1232d to rotate around their own axes. During the rotation of each planetary gear 1232d around its own axis, it also meshes with the second internal gear ring 1232a. The meshing teeth of the second internal gear ring 1232a drive the multiple planetary gears 1232d to revolve around the axis of the second internal gear ring 1232a. In turn, the multiple planetary gears 1232d together drive the gear disk 1232c to rotate during the revolution, and the gear disk 1232c drives the third reduction gear 1223 of the reduction assembly 122 to rotate, thereby realizing the torque transmission of the drive component 1231. The planetary gear assembly has the advantage of small size, which makes it easy to arrange flexibly according to the folding space.

[0076] The working principle of the above-mentioned radially driven independent walking device is roughly as follows:

[0077] First, the planetary reducer 1232 is driven by the drive member 1231 to drive the third reduction gear 1223. The first reduction gear 1221 and the second reduction gear 1222 rotate with the third reduction gear 1223 and transmit the torque of the third reduction gear 1223 to the fourth reduction gear 1224, so that the planetary reducer 1232 and the reduction assembly 122 reduce the speed of the drive member 1231. Then, the fourth reduction gear 1224 drives the drive shaft 1213b to rotate. The drive shaft 1213b drives the driven shaft 1213c to rotate through the movable part 1213e and the fixed part 1213k. Finally, the driven shaft 1213c drives the drive gear 1212 to rotate, so that the drive gear 1212 drives the first internal gear ring 1211 and the traveling wheel 11 to rotate, thereby realizing independent driving of the traveling wheel 11.

[0078] This embodiment also provides an electric folding trolley, which includes two sets of the above-mentioned radially driven independent walking devices, a folding frame and two sets of driven wheels. The two sets of radially driven independent walking devices are arranged in the left-right direction and connected to the folding frame. The two sets of driven wheels are arranged at intervals in the front-back direction and connected to the folding frame. The folding frame is used to fold in the front-back direction and the left-back direction, so as to make the electric folding trolley more convenient to carry.

[0079] In some embodiments, the drive mechanisms 12 of the two sets of radially driven independent walking devices are staggered. Thus, when the folding frame is folded in the left-right direction, the folding frame drives the two walking wheels 11 and the drive mechanism 12 to move closer to each other in the left-right direction of the electric folding trolley. By staggering the two sets of drive mechanisms 12, clearance space is provided for the two walking wheels 11 to move closer to each other, so that the distance between the two walking wheels 11 is smaller. This allows the folding frame to be better retracted and folded in the left-right direction, and reduces the size of the folded electric folding trolley, which is beneficial to further improving the portability of the electric folding trolley.

[0080] The process of making the electric folding trolley described above is roughly as follows;

[0081] When the frame of the electric trolley is folded, it folds simultaneously in the front-to-back and left-to-right directions. The front-to-back folding of the frame causes each driven wheel to gradually approach its corresponding travel wheel 11 in the front-to-back direction, thereby driving the folding of the two driven wheels and the two travel wheels 11 in the front-to-back direction.

[0082] By folding in the left and right directions, the two driven wheels gradually approach each other in the left and right directions to a folded state, and the two walking wheels 11 and the two drive mechanisms 12 gradually approach each other in the left and right directions to a folded state. Since the two drive mechanisms 12 have a radial layout structure, they can provide folding space for the two walking wheels 11 that are close to each other. As a result, the two radially driven independent walking devices occupy less space after folding, making the electric folding trolley more flexible and portable.

[0083] By staggering the two drive mechanisms 12, the drive mechanisms 12 will not interfere with each other in the left and right directions, so that the two walking wheels 11 can get closer together, thereby forming a smaller folding structure and further reducing the space occupied by the folded electric folding trolley.

[0084] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A radially driven independent walking device, characterized in that, The device includes a traveling wheel and a drive mechanism. The drive mechanism includes a drive assembly, a reduction assembly, and a connecting assembly connected in sequence. The drive assembly is located radially on the traveling wheel and close to the outer wall of the tire. The reduction assembly is located axially on the traveling wheel and close to the inner hub surface of the traveling wheel. The connecting assembly is located inside the traveling wheel. The drive assembly drives the reduction assembly to move the connecting assembly, thereby causing the connecting assembly to rotate the traveling wheel. The connecting assembly includes a first internal gear ring, a drive gear, and a connector. The first internal gear ring is coaxially arranged with the traveling wheel and connected to the inner wall of the traveling wheel. The drive gear meshes with the first internal gear ring. The connector is connected to the drive gear and the reduction assembly. The connector includes a connecting shaft and a release body. The connecting shaft includes a drive shaft and a driven shaft. The drive shaft and the driven shaft are coaxially arranged and connected to the reduction assembly. The driven shaft is connected to the drive gear. The release body includes a movable part and a fixed part. The movable part is slidably sleeved on the drive shaft along the axial direction of the drive shaft. The fixed part is connected to the driven shaft. The movable part is used to hold the fixed part in place. The fixed part has a slot, one side wall of the slot is inclined and forms a pushing surface, the movable part includes a sleeve ring and a retaining claw, the sleeve ring is slidably sleeved on the drive shaft along the axial direction of the drive shaft; the retaining claw is connected to the side of the sleeve ring facing the fixed part, the retaining claw is used to extend into the slot and drive the fixed part to rotate, the sleeve ring is also used to push against the pushing surface to disengage from the slot under the reaction force of the pushing surface.

2. The radially driven independent walking device according to claim 1, characterized in that, The drive assembly outputs power along the axial direction of the traveling wheel, and the deceleration assembly transmits power along the radial direction of the traveling wheel.

3. The radially driven independent walking device according to claim 1, characterized in that, The total width of the independent walking device along the axial direction of the walking wheel is less than or equal to 1.8 times the axial width of the walking wheel.

4. The radially driven independent walking device according to claim 1, characterized in that, The deceleration component includes: First reduction gear; The second reduction gear is coaxially arranged with and connected to the first reduction gear. The diameter of the second reduction gear is larger than that of the first reduction gear. Both the first reduction gear and the second reduction gear are rotatably connected to the walking wheel. The third reduction gear is connected to the output shaft of the drive assembly and meshes with the second reduction gear; The fourth reduction gear is connected to the connecting assembly and meshes with the first reduction gear.

5. The radially driven independent walking device according to claim 1, characterized in that, The driving component includes: A drive component is arranged radially along the traveling wheel and adjacent to the traveling wheel; A planetary reducer is arranged radially along the travel wheel and adjacent to the travel wheel, and the planetary reducer protrudes axially from the travel wheel. The planetary reducer is connected to the drive component and the reduction assembly.

6. The radially driven independent walking device according to claim 1, characterized in that, The connection component also includes: The first dustproof plate is disposed inside the walking wheel and connected to the wheel hub of the walking wheel; The second dustproof plate is disposed on opposite sides of the first dustproof plate on the first internal gear ring. The second dustproof plate is connected to the hub of the traveling wheel, and the connecting member is movably inserted through the second dustproof plate.

7. The radially driven independent walking device according to claim 5, characterized in that, The planetary speed reducer includes: The second internal gear ring is connected to the drive component; The gear assembly includes a gear disk, a plurality of planetary gears, and a linkage gear. The gear disk is coaxially disposed within the second internal gear ring. The plurality of planetary gears are circumferentially spaced about the axis of the gear disk and rotatably connected to the gear disk. A portion of each planetary gear protrudes radially from the gear disk and meshes with the second internal gear ring. The linkage gear is connected to the drive member and meshes with the plurality of planetary gears.

8. An electric folding trolley, characterized in that, The electric folding trolley includes: Two sets of radially driven independent walking devices as described in any one of claims 1-7; A folding frame, with two sets of radially driven independent walking devices arranged in the left-right direction and connected to the folding frame; Two sets of driven wheels are spaced apart in the front-rear direction and connected to the folding frame.

9. The electric folding trolley according to claim 8, characterized in that, The drive mechanisms of the two sets of radially driven independent walking devices are staggered.

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