Carrier

Abstract

The carrier comprises a vehicle frame body, a first wheel assembly and a second wheel assembly, and the vehicle frame body is provided with a bottom frame provided with a connecting structure; the first wheel assembly comprises a first wheel seat provided with a first matching structure, and a first wheel body rotationally arranged on the first wheel seat around a first axis; the second wheel assembly comprises a second wheel seat provided with a second matching structure, and a second wheel body which is rotatably arranged on the second wheel seat around a second axis and is larger than the first wheel body in diameter; the carrier has a first state and a second state, in the first state, the first wheel assembly is connected with the frame body, and a first distance is formed between the bottom frame and the first axis in the vertical direction; in the second state, the second wheel assembly is connected with the vehicle frame body, a second interval is formed between the bottom frame and the second axis in the vertical direction, the first interval is larger than the second interval, the application scene of the carrier is enriched, and the height of the vehicle frame body can be basically kept unchanged.

Description

Technical Field

[0001] The invention relates to a carrier. Background Art

[0002] In the prior art, some vehicles move slowly during use, such as child strollers and cargo carts, and their wheel assemblies are usually small in size, while some vehicles move quickly during use, such as treadmills and bicycle trailers, and their wheel assemblies are usually large in size. Some vehicles use larger wheel assemblies installed on the frame of vehicles such as strollers to change the use mode of the vehicle, but after the large wheel assemblies are installed on the frame, the frame is often lifted upward, so that the center of gravity of the vehicle moves upward, and the stability of the items carried will decrease. Summary of the invention

[0003] The purpose of the present invention is to provide a new carrier.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: a carrier, the carrier comprising:

[0005] A vehicle frame body, wherein the vehicle frame body has a bottom frame, and a connecting structure is arranged on the bottom frame;

[0006] The first wheel assembly comprises a first wheel seat and a first wheel body rotatably arranged on the first wheel seat around a first axis, wherein the first wheel seat is provided with a first matching structure that can be detachably connected to the connecting structure;

[0007] The second wheel assembly comprises a second wheel seat, a second wheel body rotatably arranged on the second wheel seat around a second axis, the diameter of the second wheel body is larger than the diameter of the first wheel body, and the second wheel seat is provided with a second matching structure that can be detachably connected to the connecting structure.

[0008] The vehicle has a first state in which the first wheel assembly is connected to the frame body, and a second state in which the second wheel assembly is connected to the frame body.

[0009] In the first state, the first matching structure and the connecting structure are matched and connected to each other, so that the base frame and the first axis have a first distance in the vertical direction; in the second state, the second matching structure and the connecting structure are matched with each other, and the base frame and the second axis have a second distance in the vertical direction, wherein the first distance is greater than the second distance.

[0010] In some embodiments, the connection structure includes a plug connector extending downwardly from the base frame, and the plug connector can be connected to the first mating structure or the second mating structure.

[0011] In some embodiments, the first mating structure includes a connector protruding and extending from the first wheel seat toward the direction of the plug connector, and a mutually mating engagement structure is provided between the connector and the plug connector. When the connector and the plug connector are engaged with each other, the length of the engagement formed is greater than the length of either the connector or the plug connector.

[0012] In some embodiments, the coupling structure includes a coupling groove, which is provided on one of the connector and the plug connector, and the other can be cooperatively inserted into the coupling groove, wherein the depth of the coupling groove is less than the length of the connector and the length of the plug connector.

[0013] In some embodiments, the second mating structure is a plug-in slot provided on the second wheel seat, and at least a portion of the plug connector can be matingly inserted into the plug-in slot.

[0014] In some embodiments, a protrusion that is integrally arranged in a direction perpendicular to the extension direction of the plug connector is disposed on the second wheel seat, the plug connector slot is disposed on the protrusion, and the protrusion extends in a direction away from the plug connector.

[0015] In some embodiments, when the plug connector is mated with the first mating structure, the plug connector is entirely located above the first axis; when the plug connector is mated with the second mating structure, the plug connector is at least partially located below the second axis.

[0016] In some embodiments, the plug connector gradually extends obliquely backward from top to bottom, and the first mating structure and the second mating structure are respectively detachably mated and connected with the plug connector along the length extension direction of the plug connector.

[0017] In some embodiments, the first wheel seat and the first wheel body in the first wheel assembly each have two spaced-apart arrangements along the extension direction of the first axis; the second wheel seat and the second wheel body in the second wheel assembly each have two spaced-apart arrangements along the extension direction of the second axis, wherein the first mating structure, the second mating structure, and the connecting structure each have two groups spaced-apart arrangements, and the spacing between the two groups of the first mating structures, the spacing between the two groups of the second mating structures, and the spacing between the two groups of the connecting structures are the same.

[0018] In some embodiments, the first wheel assembly includes a first connecting arm fixed between the two first wheel seats, so that the first wheel assembly can be integrally connected to or detached from the frame body;

[0019] The second wheel assembly includes a second connecting arm fixed between the two second wheel seats, so that the second wheel assembly can be integrally connected to the frame body or detached from the frame body.

[0020] In some embodiments, when the carrier is in the first state and in the second state, the height of the base frame in the vertical direction is substantially the same.

[0021] In some embodiments, the connecting structure is arranged at the rear part of the frame body, the carrier also includes a push rod frame, a traction rod and a third wheel assembly, the push rod frame is movably connected to the frame body, and the push rod frame has an open position opened relative to the frame body and a folded position folded relative to the frame body, the traction rod and the third wheel assembly are respectively foldably or detachably connected to the frame body, the carrier is in a first state, the third wheel assembly is installed at the bottom front part of the frame body, the first wheel assembly is installed at the bottom rear part of the frame body, the push rod frame is in the open position, the traction rod is folded relative to the frame body or detached from the frame body; when the carrier is in a second state, the third wheel assembly is folded relative to the frame body or detached from the frame body, the second wheel assembly is installed at the bottom rear part of the frame body, the push rod frame is in the folded position, and the traction rod extends forward from the front part of the frame body.

[0022] In some embodiments, the frame body further includes a surrounding frame assembly disposed on the base frame, and the surrounding frame assembly is arranged above the base frame to form a frame-shaped bearing space.

[0023] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: the carrier of the present invention has a first wheel assembly and a second wheel assembly that can be replaced. The user can connect the first wheel assembly or the second wheel assembly to the frame body according to different usage scenarios or different usage requirements, which enriches the usage scenarios of the carrier and avoids waste of resources. At the same time, the first spacing is greater than the second spacing, so that the height of the frame body in the vertical direction is basically the same in the first state and the second state, avoiding the frame body from being excessively raised or lowered after the wheel assembly is replaced, thereby avoiding the stability of the carrier carrying items being affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attached Figure 1 It is a schematic diagram of the three-dimensional structure of a carrier in a first state according to a specific embodiment of the present invention;

[0025] Attached Figure 2 For attachment Figure 1 A partially exploded schematic diagram of

[0026] Attached Figure 3 For attachment Figure 2 The enlarged schematic diagram of point A in the middle;

[0027] Attached Figure 4 is a schematic diagram of the three-dimensional structure of the carrier of the present invention in the second state;

[0028] Attached Figure 5 For attachment Figure 4 A partially exploded schematic diagram of

[0029] Attached Figure 6 For attachment Figure 5 The enlarged schematic diagram of point B in the middle;

[0030] Attached Figure 7 For attachment Figure 4 A three-dimensional schematic diagram of the structure of the middle part;

[0031] Attached Figure 8 It is a partially exploded schematic diagram of the mounting base of the present invention;

[0032] Wherein: 110, bottom frame; 120, mounting seat; 121, mounting hole; 130, plug connector; 140, upper enclosure frame; 141, first enclosure rod; 142, second enclosure rod; 150, support frame;

[0033] 210, first wheel assembly; 211, first wheel seat; 212, first wheel body; 213, connecting body; 214, engaging groove; 215, first connecting arm; 220, second wheel assembly; 221, second wheel seat; 2210, wheel seat body; 2211, protrusion; 2212, connecting part; 222, second wheel body; 223, plug-in groove; 224, second connecting arm;

[0034] 300, third wheel assembly; 310, wheel frame; 320, wheel axle; 330, third wheel body;

[0035] 400, traction rod; 410, rod body; 420, plug-in portion; 430, connector;

[0036] 500, push rod frame; 510, push rod; 520, push handle;

[0037] 610, linkage rod; 620, sliding member. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. Obviously, the embodiments described in this application are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0039] See also Figure 1 , Figure 4 A vehicle shown in the figure comprises a frame body, a first wheel assembly 210 and a second wheel assembly 220. The frame body has a bottom frame 110, and a connecting structure is arranged on the bottom frame 110. The first wheel assembly 210 comprises a first wheel seat 211, a first wheel body 212 rotatably arranged on the first wheel seat 211 around a first axis X1, and a first matching structure that can be detachably connected to the connecting structure is arranged on the first wheel seat 211. The second wheel assembly 220 comprises a second wheel seat 221, a second wheel body 222 rotatably arranged on the second wheel seat 221 around a second axis X2, the diameter of the second wheel body 222 is larger than the diameter of the first wheel body 212, and a second matching structure that can be detachably connected to the connecting structure is arranged on the second wheel seat 221. The first wheel assembly and the second wheel assembly can be used interchangeably, and the user can connect the first wheel assembly 210 or the second wheel assembly 220 to the frame body according to different usage scenarios or different usage requirements.

[0040] The vehicle has a first state in which the first wheel assembly 210 is connected to the frame body, and a second state in which the second wheel assembly 220 is connected to the frame body. In the first state, due to the small size of the first wheel assembly 210, the movement and turning of the vehicle are more flexible. The larger second wheel assembly 220 has better grip, and can better maintain the stability of the vehicle when the moving speed is faster. At the same time, it is also more durable and has a longer service life. Therefore, in the second state, the vehicle is suitable for scenes with fast moving speed, high stability requirements, or high durability requirements for wheel assemblies. For example, the vehicle in this state is suitable for being fixed behind a bicycle or other movable vehicle, driven by a bicycle or other movable vehicle, and used as a trailer.

[0041] In the first state, the first matching structure and the connecting structure cooperate with each other to connect, so that the bottom frame 110 and the first axis X1 have a first spacing in the vertical direction. In the second state, the second matching structure and the connecting structure cooperate with each other, so that the bottom frame 110 and the second axis X2 have a second spacing in the vertical direction. The first spacing is greater than the second spacing, so that the bottom surface of the frame body of the vehicle in the first state and the second state is substantially the same in the vertical direction, so as to avoid the frame body being excessively raised after the first wheel assembly 210 is replaced by the second wheel assembly 220, or to avoid the frame body being excessively lowered after the second wheel assembly 220 is replaced by the first wheel assembly 210, thereby avoiding affecting the stability of the load.

[0042] Specifically, the connection structure includes a plug connector 130 extending downwardly from the base frame 110, and the plug connector 130 can be connected to the first matching structure or the second matching structure. When the plug connector 130 is matched with the first matching structure, the plug connector 130 is located above the first axis X1 as a whole; when the plug connector 130 is matched with the second matching structure, at least part of the plug connector 130 is located below the second axis X2. In this way, the distance between the second axis X2 and the base frame 110 is reduced, that is, the effect of reducing the second distance is achieved, so that when the second wheel assembly 220 is matched with the connection structure, the base frame 110 will not be lifted upward excessively, so that the height of the base frame 110 in the vertical direction is basically the same in the first state and the second state of the vehicle.

[0043] In this embodiment, the first matching structure includes a connecting body 213 protruding and extending from the first wheel seat 211 toward the direction of the plug connector 130, see Figure 3 As shown, the connector 213 protrudes upward from the first wheel seat 211, and a mating structure is provided between the connector 213 and the plug connector 130. When the connector 213 and the plug connector 130 are mated with each other, the length of the joint body formed is greater than the length of either the connector 213 or the plug connector 130. Specifically, the mating structure includes a mating groove 214, which is provided on one of the connector 213 and the plug connector 130, and the other can be matingly inserted into the mating groove 214, and the depth of the mating groove 214 is less than the length of the connector 213 and the length of the plug connector 130. See FIG. Figure 6 As shown, in this embodiment, the second matching structure is a plug-in slot 223 provided on the second wheel seat 221, and at least a portion of the plug connector 130 can be matched and inserted into the plug-in slot 223. In this embodiment, see Figure 7 As shown, the plug connector 130 gradually extends obliquely backward from top to bottom, and the first matching structure and the second matching structure are detachably matched and connected with the plug connector 130 along the length extension direction of the plug connector 130 .

[0044] See also Figure 3 As shown, in this embodiment, the engagement groove 214 is provided on the connecting body 213, and the connecting body 213 extends upward and forward from the first wheel seat 211, and the engagement groove 214 also extends gradually forward from bottom to top, and the engagement groove 214 is located above the first axis X1 as a whole. In this embodiment, the plug-in groove 223 extends downward and backward from above the second axis X2, and the plug-in groove 223 extends to the rear side of the second axis X2 and extends to below the second axis X2. In this way, when the plug connector 12 is inserted into the plug-in groove 223, at least part of the plug connector 130 is located below the second axis X2.

[0045] In this embodiment, see Figure 6As shown, the second wheel seat 221 is provided with a protrusion 2211 which is integrally arranged in the direction perpendicular to the extension direction of the plug connector 130, and the plugging groove 223 is arranged on the protrusion 2211, and the protrusion 2211 is extended in the direction away from the plug connector 130. Specifically, the second wheel seat 221 includes a wheel seat body 2210, and the protrusion 2211 extends backward from the wheel seat body 2210. The second wheel seat 221 also includes a connecting portion 2212 extending in the left-right direction, and the connecting portion 2212 extends from the wheel seat body 2210 to the outside of the frame body, and the second wheel body 222 is rotatably connected to the end of the connecting portion 2212 away from the wheel seat body 2210. Figure 6 As shown, the protrusion 2211 extends from the upper side of the connecting portion 2212 to the rear side of the connecting portion 2212 .

[0046] In this embodiment, the first wheel seat 211 and the first wheel body 212 in the first wheel assembly 210 each have two spaced apart arrangements along the extension direction of the first axis X1; the second wheel seat 221 and the second wheel body 222 in the second wheel assembly 220 each have two spaced apart arrangements along the extension direction of the second axis X2. The first matching structure, the second matching structure, and the connecting structure each have two spaced apart arrangements, and the spacing between the two groups of first matching structures, the spacing between the two groups of second matching structures, and the spacing between the two groups of connecting structures are the same.

[0047] In this embodiment, the first wheel assembly 210 includes a first connecting arm 215 fixed between two first wheel seats 211, so that the first wheel assembly 210 can be integrally connected to the frame body or detached from the frame body. In this embodiment, the second wheel assembly 220 includes a second connecting arm 224 fixed between two second wheel seats 221, so that the second wheel assembly 220 can be integrally connected to the frame body or detached from the frame body.

[0048] In this embodiment, the connection structure is arranged at the rear of the frame body, and the vehicle further comprises a push rod frame 500, a traction rod 400 and a third wheel assembly 300. The push rod frame 500 is movably connected to the frame body, and the push rod frame 500 has an open position opened relative to the frame body and a folded position folded relative to the frame body, and the traction rod 400 and the third wheel assembly 300 are respectively foldably or detachably connected to the frame body.

[0049] When the vehicle is in the first state, the third wheel assembly 300 is installed at the bottom front part of the frame body, the first wheel assembly 210 is installed at the bottom rear part of the frame body, the push rod frame 500 is in the open position, and the traction rod 400 is folded relative to the frame body or detached from the frame body. In this state, the first wheel assembly 210 and the third wheel assembly 300 jointly maintain the stability of the frame body, and the vehicle can be used as a single-use cart or trailer for carrying goods or carrying children.

[0050] When the carrier is in the second state, the third wheel assembly 300 is folded relative to the frame body or detached from the frame body, the second wheel assembly 220 is installed at the bottom rear of the frame body, the push rod frame 500 is in the folded position, and the traction rod 400 extends forward from the front of the frame body. In this state, the carrier can be fixed to the rear of a bicycle or other movable vehicle by the traction rod 400.

[0051] In this embodiment, a mounting seat 120 is fixedly provided at the front of the frame body, and one end of the traction rod 400 can be detachably connected to the mounting seat 120 through a connecting piece 430. When the vehicle is in the first state, the traction rod 400 is detached from the mounting seat 120, and when the vehicle is in the second state, the traction rod 400 is connected to the mounting seat 120. For details, see Figure 8 As shown, the mounting seat 120 has a mounting hole 121, and one end of the traction rod 400 can be inserted into the mounting hole 121 in a matching manner. Figure 5 As shown, the traction rod 400 includes a rod body 410 and an inserting portion 420 bent and extended from one end of the rod body 410 . The inserting portion 420 extends in the left-right direction and can be inserted in the mounting hole 121 in a fitting manner.

[0052] In this embodiment, the connecting member 430 detachably connects the mounting seat 120 and the traction rod 400 along a connecting direction, and the connecting direction extends perpendicular to the direction in which the traction rod 400 is inserted into the mounting hole 121. Figure 8 As shown, the connecting member 430 is a locking pin. The mounting seat 120 and the plug-in portion 420 of the traction rod 400 are both provided with locking holes. When the connecting member 430 is inserted into the locking hole of the mounting seat 120 and the locking hole of the plug-in portion 420, the locking pin realizes the locking of the mounting seat 120 and the traction rod 400, so that the two cannot be detached. In this embodiment, when the locking pin is inserted into the locking holes of the mounting seat 120 and the plug-in portion 420 that are connected to each other along the up-down direction, the mounting seat 120 and the traction rod 400 are locked. When the locking pin is separated from the locking holes of the mounting seat 120 and the plug-in portion 420, the plug-in portion 420 can be detached from the mounting hole 121.

[0053] In this embodiment, the push rod frame 500 includes two groups of push rods 510 respectively arranged on the left and right sides, the frame body is located between the two groups of push rods 510 along the left and right directions, and one end of the push rod 510 is rotatably connected to the frame body. In this embodiment, the push rod frame 500 also includes a push handle bar 520 extending along the left and right directions, see Figure 1As shown, the vehicle is in the first state, and the push rod 520 is connected between the upper ends of the two sets of push rods 510. In this state, the user can drive the vehicle to move by holding the push rod 520. Specifically, the push rod 510 is rotatably connected to the front part of the bottom frame 110. In the first state, the push rod frame 500 extends in the up-down direction and unfolds relative to the bottom frame 110. In the second state, the push rod frame 500 is folded above the bottom frame 110.

[0054] In this embodiment, the push rod frame 500 is in the open position, and the push rod 510 has a first use state in which it extends upward from the front to the rear, and a second use state in which it gradually extends upward from the rear to the front. In the first state, the push handle rod 520 is located at the rear side of the frame body, and the vehicle is used as a cart. The user can hold the push handle rod 520 and push it forward to drive the vehicle forward. In the second use state, the push handle rod 520 is located at the front side of the frame body. In this state, the vehicle can be used as a trailer, and the user can pull the push rod frame 500 forward to drive the vehicle forward.

[0055] In this embodiment, see Figure 3 As shown, in the second state, the frame body is located between the two sets of second wheel bodies 222 along the left-right direction, and the frame body and the second wheel bodies 222 are arranged with a spacing, and when the push rod frame 500 is in the folded position, an escape space capable of accommodating the push rod 510 is formed between the frame body and the second wheel body 222, so as to facilitate the folding of the push rod 510 between the second wheel body 222 and the frame body. In this embodiment, the second wheel body 222 is higher than the bottom frame 110, and the escape space is provided to facilitate the folding of the push rod frame 500 downward relative to the bottom frame 110.

[0056] In this embodiment, the vehicle further includes a linkage assembly, which is movably disposed between the push rod frame 500 and the frame body, so that the push rod frame 500 can be switched between the open position and the folded position. Specifically, the linkage assembly includes two groups of linkage rods 610 disposed on the left and right sides, and the linkage rods 610 are movably connected between the frame body and the push rod 510. In this embodiment, the linkage assembly further includes a sliding member 620, which can be slidably disposed on the push rod 510 along the length extension direction of the push rod 510, one end of the linkage rod 610 is rotatably connected to the sliding member 620 and the other end is rotatably connected to the frame body, specifically, the other end of the linkage rod 610 is rotatably connected to the chassis 110.

[0057] When the carrier is in the first state and the push rod 510 is in the first use state, see Figure 1 As shown, the linkage rod 610 extends in the up-down direction, and the push rod 510, the linkage rod 610, and the bottom frame 110 form a triangular structure to maintain the state of the push rod frame 500. In the second state, see Figure 3 , Figure 5 As shown, the linkage rod 610 is converted to extend along the front-rear direction, and the push rod 510 and the linkage rod 610 are both located in the avoidance space.

[0058] In this embodiment, the linkage rod 610 has a first rod section and a second rod section that are fixedly arranged. When the push rod 510 is in the first use state, the first rod section extends from bottom to top and tilts backward, and the second rod section bends upward and extends from the rear of the first rod section, so that an obtuse angle is formed between the first rod section and the second rod section. When the vehicle is in the second state, the second rod section can abut against the second wheel seat 221, so that the push rod frame 500 is maintained in the folded position.

[0059] In this embodiment, see Figure 2 As shown, the third wheel assembly 300 is detachably connected to the frame body, specifically, the third wheel assembly 300 is detachably connected to the base frame 110, and when the vehicle is in the second state, the third wheel assembly 300 is detached from the base frame 110. In this embodiment, the third wheel assembly 300 is a universal wheel, which includes a wheel frame 310 rotatably connected to the base frame 110 around a rotation center line extending in the vertical direction, and a third wheel body 330 rotatably connected to the wheel frame 310 around a wheel axle 320, and the axis of the wheel axle 320 extends in the horizontal direction. In this embodiment, the third wheel assembly 300 includes two groups arranged at intervals in the left and right directions, and the two groups of third wheel assemblies 300 are respectively arranged on the left and right sides of the base frame 110.

[0060] The frame body also includes a frame assembly disposed on the bottom frame 110, and the frame assembly is disposed above the bottom frame 110 to form a frame-shaped bearing space. In this embodiment, the frame assembly includes an upper frame 140 located above the bottom frame 110 and a support frame 150 connected between the upper frame 140 and the bottom frame 110. Figure 1 As shown, the upper enclosure 140 includes a first enclosure rod 141 extending in the front-to-back direction and a second enclosure rod 142 extending in the left-to-right direction, the first enclosure rod 141 includes two enclosure rods spaced apart in the left-to-right direction, the second enclosure rod 142 includes two enclosure rods spaced apart in the front-to-back direction, and the two first enclosure rods 141 and the two second enclosure rods 142 are connected end to end to form a closed frame. The support frame 150 includes two groups spaced apart in the front-to-back direction, and the two groups of support frames 150 are respectively connected between the two second enclosure rods 142 and the bottom frame 110. In this embodiment, the support frame 150 can be folded in the up-down direction, so that the upper enclosure 140 can be folded relative to the bottom frame 110, so as to reduce the size of the space occupied by the carrier when the carrier is not in use.

[0061] In summary, the vehicle of this embodiment has a first wheel assembly 210 and a second wheel assembly 220 that can be used interchangeably. In the first state, the first wheel assembly 210 is connected to the frame body, and the third wheel assembly 300 is also connected to the frame body. In this state, the vehicle itself can maintain stability and can be used alone. In the second state, the second wheel assembly 220 is connected to the frame body, and the third wheel assembly 300 is detached from the frame body. In this state, the vehicle can be fixed to the rear of a bicycle or other vehicle through the towing rod 400 and used as a trailer. In the first state and the second state, the height of the frame body in the vertical direction is basically the same, and the stability of the vehicle when carrying objects will not be affected.

[0062] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle, characterized in that: The vehicle comprises: A vehicle frame body, wherein the vehicle frame body has a bottom frame, and a connecting structure is arranged on the bottom frame; The first wheel assembly comprises a first wheel seat and a first wheel body rotatably arranged on the first wheel seat around a first axis, wherein the first wheel seat is provided with a first matching structure that can be detachably connected to the connecting structure; The second wheel assembly comprises a second wheel seat, a second wheel body rotatably arranged on the second wheel seat around a second axis, the diameter of the second wheel body is larger than the diameter of the first wheel body, and the second wheel seat is provided with a second matching structure that can be detachably connected to the connecting structure. The vehicle has a first state in which the first wheel assembly is connected to the frame body, and a second state in which the second wheel assembly is connected to the frame body. In the first state, the first mating structure and the connecting structure are mutually mated and connected, and the base frame and the first axis have a first distance in the vertical direction; in the second state, the second mating structure and the connecting structure are mutually mated, and the base frame and the second axis have a second distance in the vertical direction, wherein the first distance is greater than the second distance.

2. The carrier according to claim 1, characterized in that: The connection structure includes a plug connector that protrudes downward from the base frame, and the plug connector can be connected to the first matching structure or the second matching structure.

3. The carrier according to claim 2, characterized in that: The first matching structure comprises a connector protruding and extending from the first wheel seat toward the direction where the plug connector is located, and a mutually matching joint structure is provided between the connector and the plug connector; When the connector and the plug connector are connected to each other, the length of the connected body is greater than the length of either the connector or the plug connector; The coupling structure includes a coupling groove, which is provided on one of the connector and the plug connector, and the other can be cooperatively inserted into the coupling groove, wherein the depth of the coupling groove is less than the length of the connector and the length of the plug connector.

4. The carrier according to claim 2, characterized in that: The second matching structure is a plug-in slot provided on the second wheel seat, and at least a portion of the plug connector can be matched and inserted into the plug-in slot; The second wheel seat is provided with a protrusion which is arranged in a direction perpendicular to the extension direction of the plug connector as a whole, and the plug connector slot is arranged on the protrusion; the protrusion is extended in a direction away from the plug connector.

5. The carrier according to claim 2, characterized in that: When the plug connector is matched with the first matching structure, the plug connector is entirely located above the first axis; when the plug connector is matched with the second matching structure, at least a portion of the plug connector is located below the second axis.

6. The carrier according to claim 2, characterized in that: The plug connector gradually extends obliquely backward from top to bottom, and the first matching structure and the second matching structure are respectively detachably matched and connected with the plug connector along the length extension direction of the plug connector.

7. The carrier according to claim 1, characterized in that: The first wheel seat and the first wheel body in the first wheel assembly each have two spaced-apart arrangements along the extension direction of the first axis; the second wheel seat and the second wheel body in the second wheel assembly each have two spaced-apart arrangements along the extension direction of the second axis, wherein the first matching structure, the second matching structure, and the connecting structure each have two groups spaced-apart arrangements, and the spacing between the two groups of the first matching structures, the spacing between the two groups of the second matching structures, and the spacing between the two groups of the connecting structures are the same.

8. The carrier according to claim 7, characterized in that: The first wheel assembly includes a first connecting arm fixedly arranged between the two first wheel seats, so that the first wheel assembly can be integrally connected to the frame body or detached from the frame body; The second wheel assembly includes a second connecting arm fixed between the two second wheel seats, so that the second wheel assembly can be integrally connected to the frame body or detached from the frame body.

9. The carrier according to claim 1, characterized in that: When the carrier is in the first state and in the second state, the height of the base frame in the vertical direction is substantially the same.

10. The carrier according to any one of claims 1 to 9, characterized in that: The connecting structure is arranged at the rear part of the frame body, and the carrier further comprises a push rod frame, a traction rod and a third wheel assembly. The push rod frame is movably connected to the frame body, and the push rod frame has an open position opened relative to the frame body and a folded position folded relative to the frame body. The traction rod and the third wheel assembly are respectively foldably or detachably connected to the frame body. The carrier is in a first state, the third wheel assembly is mounted on the bottom front portion of the frame body, the first wheel assembly is mounted on the bottom rear portion of the frame body, the push rod frame is in an open position, and the traction rod is folded relative to the frame body or detached from the frame body; When the vehicle is in the second state, the third wheel assembly is folded relative to the frame body or detached from the frame body, the second wheel assembly is mounted on the bottom rear portion of the frame body, the push rod frame is in the folded position, and the traction rod extends forward from the front portion of the frame body; And / or, the frame body further includes a surrounding frame assembly disposed on the base frame, and the surrounding frame assembly is surrounded above the base frame to form a frame-shaped bearing space.

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