Carrier

Abstract

The utility model discloses a carrier which comprises a frame body, a first wheel assembly and a second wheel assembly, and the 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 utility model relates to a carrier. BACKGROUND

[0002] In the prior art, some carriers move slowly during use, such as children's strollers, cargo trolleys, etc., and the size of the wheel assembly is usually small, and some carriers move quickly during use, such as running cars, bicycle trailers, etc., and the size of the wheel assembly is usually large. Some carriers install a large-size wheel assembly on the frame of the trolley to change the use mode of the carrier, but after installing the large-size wheel assembly on the frame, the frame is often lifted upwards, so that the center of gravity of the carrier moves upwards, and the stability of the carrier in carrying objects will decrease. SUMMARY

[0003] The utility model aims at providing a new carrier.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of a carrier, which comprises:

[0005] A frame body, the frame body has a chassis, and the chassis is provided with a connecting structure;

[0006] A first wheel assembly, comprising a first wheel seat, a first wheel body rotatably arranged on the first wheel seat about a first axis line, and a first matching structure capable of being detachably connected with the connecting structure arranged on the first wheel seat;

[0007] A second wheel assembly, comprising a second wheel seat, a second wheel body rotatably arranged on the second wheel seat about a second axis line, the diameter of the second wheel body being greater than that of the first wheel body, and a second matching structure capable of being detachably connected with the connecting structure arranged on the second wheel seat,

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

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

[0010] In some embodiments, the connecting structure comprises a plug-in connector protruding downward from the chassis, which can be connected with the first matching structure or the second matching structure.

[0011] In some embodiments, the first cooperating structure comprises a connecting body protruding from the first wheel seat in a direction towards the plug-in head, and a mutually cooperating engagement structure is provided between the connecting body and the plug-in head, and the length of the engagement body formed after the connecting body and the plug-in head are mutually engaged is greater than the length of either of the connecting body and the plug-in head.

[0012] In some embodiments, the engagement structure comprises an engagement groove provided on one of the connecting body and the plug-in head, and the other can be cooperatively inserted into the engagement groove, wherein the depth of the engagement groove is less than the length of the connecting body and the length of the plug-in head.

[0013] In some embodiments, the second cooperating structure is a plug-in groove provided on the second wheel seat, and at least part of the plug-in head can be cooperatively inserted into the plug-in groove.

[0014] In some embodiments, a protruding portion is provided on the second wheel seat, which is arranged in a direction perpendicular to the extension direction of the plug-in head, and the plug-in groove is provided on the protruding portion, and the protruding portion is arranged to extend in a direction away from the plug-in head.

[0015] In some embodiments, when the plug-in head cooperates with the first cooperating structure, the plug-in head is located above the first axis center line as a whole; and when the plug-in head cooperates with the second cooperating structure, at least part of the plug-in head is located below the second axis center line.

[0016] In some embodiments, the plug-in head gradually extends rearwardly and downwardly, and the first cooperating structure and the second cooperating structure are respectively detachably connected with the plug-in head along the extension direction of the length of the plug-in head.

[0017] In some embodiments, the first wheel seat and the first wheel body in the first wheel assembly are both provided with two in the extension direction of the first axis center line, and the second wheel seat and the second wheel body in the second wheel assembly are both provided with two in the extension direction of the second axis center line, wherein the first cooperating structure, the second cooperating structure and the connecting structure are all provided with two groups, and the spacing between the two groups of the first cooperating structure, the spacing between the two groups of the second cooperating structure and the spacing between the two groups of the connecting structure are the same.

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

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

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

[0021] In some embodiments, the connecting structure is arranged at the rear of the frame body, the vehicle 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 relative to the frame body and a folding position relative to the frame body, the traction rod and the third wheel assembly are foldably or detachably connected to the frame body, in the first state, the third wheel assembly is installed at the bottom front of the frame body, the first wheel assembly is installed at the bottom rear of the frame body, the push rod frame is in the open position, and the traction rod is folded relative to the frame body or detached from the frame body; 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 installed at the bottom rear of the frame body, the push rod frame is in the folding position, and the traction rod extends forward from the front of the frame body.

[0022] In some embodiments, the frame body further comprises a surrounding frame assembly arranged on the chassis, the surrounding frame assembly surrounds a frame-shaped load space above the chassis.

[0023] Thanks to the above technical solutions, the vehicle of the present application has the following advantages compared with the prior art: the vehicle of the present application has replaceable first and second wheel assemblies, and users can connect the first or second wheel assembly to the frame body according to different use scenarios or different use requirements, thereby enriching the use scenarios of the vehicle and avoiding waste of resources. Meanwhile, the first distance is greater than the second distance, so that the height of the frame body in the vertical direction is substantially the same in the first state and in the second state, thereby avoiding the frame body being excessively raised or lowered after the wheel assembly is replaced, and thereby avoiding the stability of the vehicle in carrying objects being affected. BRIEF DESCRIPTION OF DRAWINGS

[0024] ATTACHMENT Figure 1 is a perspective view of a vehicle of an embodiment of the present application in a first state;

[0025] ATTACHMENT Figure 2 is a partial exploded view of the vehicle of the embodiment of the present application; Figure 1

[0026] ATTACHMENT​Figure 3 Fig. 6 is a schematic view of a part of the embodiment of the present application; Figure 2 Fig. 7 is an enlarged view of part A in Fig. 6;

[0027] Fig. 8 is a schematic view of a part of the embodiment of the present application; Figure 4 Fig. 9 is a schematic view of a part of the embodiment of the present application;

[0028] Fig. 10 is a schematic view of a part of the embodiment of the present application; Figure 5 Fig. 11 is a schematic view of a part of the embodiment of the present application; Figure 4 Fig. 12 is a schematic view of a part of the embodiment of the present application;

[0029] Fig. 13 is a schematic view of a part of the embodiment of the present application; Figure 6 Fig. 14 is an enlarged view of part B in Fig. 13; Figure 5 Fig. 15 is a schematic view of a part of the embodiment of the present application;

[0030] Fig. 16 is a schematic view of a part of the embodiment of the present application; Figure 7 Fig. 17 is a schematic view of a part of the embodiment of the present application; Figure 4 Fig. 18 is a schematic view of a part of the embodiment of the present application;

[0031] Fig. 19 is a schematic view of a part of the embodiment of the present application; Figure 8 Fig. 20 is a schematic view of a part of the embodiment of the present application;

[0032] In the figure: 110, a chassis; 120, a mounting seat; 121, a mounting hole; 130, a plug; 140, an upper frame; 141, a first surrounding rod; 142, a second surrounding rod; 150, a support frame;

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

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

[0035] 400, a traction rod; 410, a rod body; 420, a plug part; 430, a connecting piece;

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

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

[0038] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments, so that the advantages and features of this utility model 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, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0039] See Figure 1 , Figure 4 The vehicle shown includes a frame body, a first wheel assembly 210, and a second wheel assembly 220. The frame body has a base frame 110, on which a connecting structure is mounted. The first wheel assembly 210 includes a first wheel seat 211 and a first wheel body 212 rotatably mounted on the first wheel seat 211 about a first axis X1. The first wheel seat 211 has a first mating structure that can be detachably connected to the connecting structure. The second wheel assembly 220 includes a second wheel seat 221 and a second wheel body 222 rotatably mounted on the second wheel seat 221 about a second axis X2. The diameter of the second wheel body 222 is larger than the diameter of the first wheel body 212. The second wheel seat 221 has a second mating structure that can be detachably connected to the connecting structure. The first wheel assembly and the second wheel assembly can be used interchangeably, allowing the user to connect either the first wheel assembly 210 or the second wheel assembly 220 to the frame body according to different usage scenarios or needs.

[0040] The vehicle has a first state where the first wheel assembly 210 is connected to the frame body, and a second state where the second wheel assembly 220 is connected to the frame body. In the first state, due to the smaller size of the first wheel assembly 210, the vehicle moves and turns more flexibly. The larger second wheel assembly 220 has better grip, which helps maintain the stability of the vehicle at higher speeds, and it is also more durable and has a longer service life. Therefore, in the second state, the vehicle is suitable for scenarios with high speeds, high stability requirements, or high durability requirements for the wheel assembly. For example, in this state, the vehicle is suitable for being fixed to the back of a bicycle or other movable vehicle, towed by the bicycle or other movable vehicle, and used as a trailer.

[0041] In the first state, the first matching structure and the connecting structure are matched and connected to each other, so that the chassis 110 and the first axis center line X1 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, so that the chassis 110 and the second axis center line X2 have a second distance in the vertical direction. The first distance is greater than the second distance, so that the height of the bottom surface of the frame body in the vertical direction is substantially the same in the first state and in the second state, avoiding the frame body being excessively raised after replacing the first wheel assembly 210 with the second wheel assembly 220, or avoiding the frame body being excessively lowered after replacing the second wheel assembly 220 with the first wheel assembly 210, thereby avoiding affecting the stability of the load bearing.

[0042] Specifically, the connecting structure includes a plug-in head 130 protruding downward from the chassis 110, which can be connected with the first matching structure or the second matching structure. When the plug-in head 130 is matched with the first matching structure, the plug-in head 130 is located above the first axis center line X1 as a whole; when the plug-in head 130 is matched with the second matching structure, at least part of the plug-in head 130 is located below the second axis center line X2. In this way, the distance between the second axis center line X2 and the chassis 110 is reduced, i.e., the second distance is reduced, so that when the second wheel assembly 220 is matched and connected with the connecting structure, the chassis 110 will not be excessively lifted upward, and the height of the chassis 110 in the vertical direction is substantially the same in the first state and in the second state.

[0043] In the present embodiment, the first matching structure includes a connecting body 213 protruding from the first wheel seat 211 in the direction of the plug-in head 130, as shown in Figure 3 The connecting body 213 protrudes upward from the first wheel seat 211, and the connecting body 213 and the plug-in head 130 are provided with engagement structures matched with each other, and the length of the engagement body formed after the connecting body 213 and the plug-in head 130 are engaged with each other is greater than the length of any one of the connecting body 213 and the plug-in head 130. Specifically, the engagement structure includes an engagement groove 214 provided on one of the connecting body 213 and the plug-in head 130, and the other can be matched and inserted in the engagement groove 214, and the depth of the engagement groove 214 is less than the length of the connecting body 213 and the length of the plug-in head 130. As shown in Figure 6 In the present embodiment, the second matching structure is a plug-in groove 223 provided on the second wheel seat 221, and at least part of the plug-in head 130 can be matched and inserted in the plug-in groove 223. In the present embodiment, as shown in Figure 7 The plug-in head 130 gradually extends downward and rearward, and the first matching structure and the second matching structure are respectively and detachably matched and connected with the plug-in head 130 along the length extension direction of the plug-in head 130.

[0044] Referring toFigure 3 As shown, the engagement groove 214 is disposed on the connecting body 213, the connecting body 213 extends upwardly and forwardly from the first wheel seat 211, the engagement groove 214 also extends gradually forwardly from bottom to top, and the engagement groove 214 is located above the first axis line X1 as a whole. In the embodiment, the insertion groove 223 extends downwardly and rearwardly from above the second axis line X2, and the insertion groove 223 extends to the rear side of the second axis line X2 and below the second axis line X2. In this way, when the insertion head 130 is inserted into the insertion groove 223, at least part of the insertion head 130 is located below the second axis line X2.

[0045] In the embodiment, referring to Figure 6 As shown, the second wheel seat 221 is provided with a protruding portion 2211 which is disposed as a whole in the direction perpendicular to the extension direction of the insertion head 130, the insertion groove 223 is disposed on the protruding portion 2211, and the protruding portion 2211 extends in the direction away from the insertion head 130. Specifically, the second wheel seat 221 includes a wheel seat body 2210, and the protruding portion 2211 extends rearwardly from the wheel seat body 2210. The second wheel seat 221 further includes a connecting portion 2212 which extends in the left-right direction, and the connecting portion 2212 extends outwardly from the wheel seat body 2210 to the outside of the frame body. The second wheel body 222 is rotatably connected to the end of the connecting portion 2212 away from the wheel seat body 2210. Referring to Figure 6 As shown, the protruding portion 2211 extends from above the connecting portion 2212 to the rear side of the connecting portion 2212.

[0046] In the embodiment, the first wheel seat 211 and the first wheel body 212 in the first wheel assembly 210 are both provided with two groups which are spaced apart along the extension direction of the first axis line X1. The second wheel seat 221 and the second wheel body 222 in the second wheel assembly 220 are both provided with two groups which are spaced apart along the extension direction of the second axis line X2. Among them, the first matching structure, the second matching structure, and the connecting structure are all provided with two groups which are spaced apart, and the spacing between the two groups of the first matching structure, the spacing between the two groups of the second matching structure, and the spacing between the two groups of the connecting structure are the same.

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

[0048] In the embodiment, the connecting structure is arranged at the rear part of the frame body, and the carrier further comprises a push rod frame 500, a tow bar 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 unfolded position relative to the frame body and a folded position relative to the frame body. The tow bar 400 and the third wheel assembly 300 are respectively foldably or detachably connected to the frame body.

[0049] 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 unfolded position, and the tow bar 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 carrier can be used as a separate stroller or trailer for carrying goods or children.

[0050] 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 part of the frame body, the push rod frame 500 is in the folded position, and the tow bar 400 extends forward from the front part of the frame body. In this state, the carrier can be fixed at the rear of a bicycle or other movable vehicle through the tow bar 400.

[0051] In the embodiment, the front part of the frame body is fixedly provided with a mounting seat 120, and one end of the tow bar 400 can be detachably connected to the mounting seat 120 through a connecting piece 430. When the carrier is in the first state, the tow bar 400 is detached from the mounting seat 120, and when the carrier is in the second state, the tow bar 400 is connected to the mounting seat 120. Specifically, as shown in Figure 8 As shown, the mounting seat 120 has a mounting hole 121, and one end of the tow bar 400 can be fittedly inserted into the mounting hole 121. As shown in Figure 5 As shown, the tow bar 400 comprises a bar body 410 and an insertion part 420 bent and extended from one end of the bar body 410. The insertion part 420 extends along the left-right direction, and the insertion part 420 can be fittedly inserted into the mounting hole 121.

[0052] In the embodiment, the connecting piece 430 detachably connects the mounting seat 120 and the tow bar 400 along a connecting direction. The connecting direction extends along a direction perpendicular to the insertion of the tow bar 400 into the mounting hole 121. Specifically, as shown in Figure 8As shown, the connecting member 430 is a locking pin, the mounting seat 120 and the insertion part 420 of the towing rod 400 are each provided with a locking hole, when the connecting member 430 is inserted into the locking holes of the mounting seat 120 and the insertion part 420, the locking pin achieves the locking of the mounting seat 120 and the towing rod 400, so that the two cannot be separated. In the embodiment, when the locking pin is inserted into the locking holes of the mounting seat 120 and the insertion part 420 in the up-down direction, the locking of the mounting seat 120 and the towing rod 400 is achieved. When the locking pin is separated from the locking holes of the mounting seat 120 and the insertion part 420, the insertion part 420 can be detached from the mounting hole 121.

[0053] In the embodiment, the push rod frame 500 includes two groups of push rods 510 arranged on the left and right sides, the frame body is located between the two groups of push rods 510 in the left-right direction, and one end of the push rod 510 is rotatably connected to the frame body. In the embodiment, the push rod frame 500 further includes a push handle rod 520 extending in the left-right direction, as shown in Figure 1 As shown, the carrier is in the first state, the push handle rod 520 is connected between the upper end portions of the two groups of push rods 510, in this state, the user can hold the push handle rod 520 to drive the carrier to move. Specifically, the push rod 510 is rotatably connected to the front portion of the chassis 110, in the first state, the push rod frame 500 extends in the up-down direction and is unfolded relative to the chassis 110, in the second state, the push rod frame 500 is folded above the chassis 110.

[0054] In the embodiment, the push rod frame 500 is in the unfolded position, the push rod 510 has a first use state of extending upwardly from front to back, and a second use state of gradually extending upwardly from back to front. In the first state, the push handle rod 520 is located at the rear side of the frame body, the carrier is used as a cart, the user can hold the push handle rod 520 and push forward to drive the carrier to move 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 carrier can be used as a trailer, the user can pull the push rod frame 500 forward to drive the carrier to move forward.

[0055] In the embodiment, as shown in Figure 3 As shown, in the second state, the frame body is located between the two groups of second wheel bodies 222 in the left-right direction, and the frame body is spaced apart from the second wheel bodies 222, when the push rod frame 500 is in the folded position, the frame body and the second wheel bodies 222 form an avoiding space capable of accommodating the push rod 510, for facilitating the folding of the push rod 510 between the second wheel bodies 222 and the frame body. In the embodiment, the second wheel body 222 is higher than the chassis 110, and the avoiding space is provided to facilitate the folding of the push rod frame 500 downward relative to the chassis 110.

[0056] In this embodiment, the vehicle also includes a linkage assembly, which is movably disposed between the push rod frame 500 and the vehicle frame body, allowing the push rod frame 500 to switch between an open position and a folded position. Specifically, the linkage assembly includes two sets of linkage rods 610 disposed on the left and right sides, and the linkage rods 610 are movably connected between the vehicle frame body and the push rod 510. In this embodiment, the linkage assembly also includes a sliding member 620, which is 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 vehicle frame body. Specifically, the other end of the linkage rod 610 is rotatably connected to the base frame 110.

[0057] When the vehicle is in the first state and the push rod 510 is in the first use state, see Figure 1 As shown, the linkage 610 extends vertically, and the push rod 510, linkage 610, and base frame 110 form a triangular structure to maintain the state of the push rod holder 500. In the second state, see... Figure 3 , Figure 5 As shown, the linkage 610 is converted to extend in the front-to-back direction, and both the push rod 510 and the linkage 610 are located within the clearance space.

[0058] In this embodiment, the linkage 610 has a fixedly configured first segment and a second segment. When the push rod 510 is in the first use state, the first segment extends backward at an upward angle, and the second segment bends upward from the rear of the first segment, so that the first segment and the second segment form an obtuse angle. When the vehicle is in the second state, the second segment 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 main frame. Specifically, the third wheel assembly 300 is detachably connected to the base frame 110. 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 swivel wheel, which includes a wheel frame 310 rotatably connected to the base frame 110 about a rotation center line extending in the vertical direction, and a third wheel body 330 rotatably connected to the wheel frame 310 about a wheel axle 320. The axis of the wheel axle 320 extends in the horizontal direction. In this embodiment, the third wheel assembly 300 includes two sets of third wheel assemblies spaced apart in the left-right direction, with the two sets of third wheel assemblies 300 respectively located on the left and right sides of the base frame 110.

[0060] The frame body further comprises a surrounding frame assembly arranged on the underframe 110, which surrounds a frame-shaped load space above the underframe 110. In the embodiment, the surrounding frame assembly comprises an upper surrounding frame 140 above the underframe 110 and a support frame 150 connected between the upper surrounding frame 140 and the underframe 110. Referring to Figure 1 As shown in the figure, the upper surrounding frame 140 comprises first surrounding rods 141 extending in the front-rear direction and second surrounding rods 142 extending in the left-right direction, the first surrounding rods 141 comprise two rods arranged at intervals in the left-right direction, and the second surrounding rods 142 comprise two rods arranged at intervals in the front-rear direction, the two first surrounding rods 141 and the two second surrounding rods 142 are connected end to end to form a closed frame shape. The support frame 150 comprises two groups arranged at intervals in the front-rear direction, and the two groups of support frames 150 are respectively connected between the two second surrounding rods 142 and the underframe 110. In the embodiment, the support frame 150 can be folded in the up-down direction, so that the upper surrounding frame 140 can be folded relative to the underframe 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 carrier of the embodiment has a replaceable first wheel assembly 210 and a second wheel assembly 220, 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 carrier 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 carrier can be fixed behind a bicycle or other possible vehicle through the tow bar 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 carrier when carrying objects will not be affected.

[0062] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A carrier, characterized by, The carrier comprises: a frame body having a chassis, the chassis being provided with a connecting structure; a first wheel assembly comprising a first wheel seat, a first wheel body rotatably arranged on the first wheel seat about a first axis center line, the first wheel seat being provided with a first matching structure capable of being detachably connected with the connecting structure; a second wheel assembly comprising a second wheel seat, a second wheel body rotatably arranged on the second wheel seat about a second axis center line, the second wheel body having a diameter greater than that of the first wheel body, the second wheel seat being provided with a second matching structure capable of being detachably connected with the connecting structure, the carrier having a first state in which the first wheel assembly is connected with the frame body, and a second state in which the second wheel assembly is connected with the frame body, in the first state, the first matching structure and the connecting structure are connected with each other, the chassis and the first axis center line having a first distance in the vertical direction; in the second state, the second matching structure and the connecting structure are connected with each other, the chassis and the second axis center line having a second distance in the vertical direction, wherein the first distance is greater than the second distance.

2. The vehicle of claim 1, wherein: the connecting structure comprising a plug connector protruding downwardly from the chassis, the plug connector being capable of being connected with the first matching structure or the second matching structure.

3. The vehicle of claim 2, wherein: the first matching structure comprising a connecting body protruding from the first wheel seat in the direction of the plug connector, the connecting body and the plug connector being provided with engagement structures capable of being engaged with each other; the length of an engagement body formed after the connecting body and the plug connector are engaged with each other being greater than the length of either the connecting body or the plug connector; the engagement structures comprising an engagement groove provided on one of the connecting body and the plug connector, the other being capable of being fitted into the engagement groove, wherein the depth of the engagement groove is less than the length of the connecting body and the length of the plug connector.

4. The carrier of claim 2, wherein: the second matching structure being a plug-in groove provided on the second wheel seat, at least a part of the plug connector being capable of being fitted into the plug-in groove; the second wheel seat being provided with a protruding portion extending in a direction perpendicular to the plug connector, the plug-in groove being provided on the protruding portion, the protruding portion extending in a direction away from the plug connector.

5. The carrier of claim 2, wherein: when the plug connector is matched with the first matching structure, the plug connector is located above the first axis center line as a whole; when the plug connector is matched with the second matching structure, at least a part of the plug connector is located below the second axis center line.

6. The carrier of claim 2, wherein: the plug connector gradually extends backwardly and downwardly, the first matching structure and the second matching structure being detachably matched with the plug connector along the length extension direction of the plug connector.

7. The carrier of claim 1, wherein: The first wheel seat and the first wheel body in the first wheel assembly are both provided with two in the extension direction of the first axis line; the second wheel seat and the second wheel body in the second wheel assembly are both provided with two in the extension direction of the second axis line, wherein the first matching structure, the second matching structure and the connecting structure are all provided with two groups, and the distance between the two groups of the first matching structure, the distance between the two groups of the second matching structure and the distance between the two groups of the connecting structure are the same.

8. The carrier of claim 7, wherein: The first wheel assembly comprises a first connecting arm fixed between the two first wheel seats, so that the first wheel assembly can be integrally connected with or detached from the frame body; The second wheel assembly comprises a second connecting arm fixed between the two second wheel seats, so that the second wheel assembly can be integrally connected with or detached from the frame body.

9. The vehicle of claim 1, wherein: The height of the chassis in the vertical direction is substantially the same in the first state and in the second state.

10. The carrier of any one of claims 1 to 9, wherein: The connecting structure is arranged at the rear of the frame body, and the vehicle 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 relative to the frame body and a folding position relative to the frame body, the traction rod and the third wheel assembly are foldable or detachable connected with the frame body, In the first state, the third wheel assembly is installed at the bottom front of the frame body, the first wheel assembly is installed at the bottom rear of the frame body, the push rod frame is in the open position, and the traction rod is folded relative to the frame body or detached from the frame body; 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 installed at the bottom rear of the frame body, the push rod frame is in the folding position, and the traction rod extends forward from the front of the frame body; And / or, the frame body further comprises a surrounding frame assembly arranged on the chassis, and the surrounding frame assembly surrounds a frame-shaped load bearing space above the chassis.

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