Carrier

Abstract

A carrier, comprising a frame body, a first wheel assembly (210), and a second wheel assembly (220). The frame body comprises a chassis (110) provided with a connection structure; the first wheel assembly (210) comprises first wheel seats (211) each provided with a first mating structure, and first wheel bodies (212) each rotatably arranged on the corresponding first wheel seat (211) about a first axis (X1); the second wheel assembly (220) comprises second wheel seats (221) each provided with a second mating structure, and second wheel bodies (222) each rotatably arranged on the corresponding second wheel seat (221) about a second axis (X2) and having a diameter greater than that of each first wheel body (212); when the carrier is in a first state, the first wheel assembly (210) is connected to the frame body, and there is a first distance between the chassis (110) and the first axis (X1) in the vertical direction; and when the carrier is in a second state, the second wheel assembly (220) is connected to the frame body, there is a second distance between the chassis (110) and the second axis (X2) in the vertical direction, and the first distance is greater than the second distance. The carrier has a variety of application scenarios, and the height of the frame body therein can remain substantially unchanged.

Description

Vehicle

[0001] This application claims priority to Chinese patent application No. 202411027944.8, filed on July 30, 2024, the contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of transportation technology, specifically to a vehicle. Background Technology

[0003] In existing technologies, some vehicles move slowly during use, such as strollers and cargo carts, and their wheel assemblies are typically small. Other vehicles move faster, such as treadmills and bicycle trailers, and their wheel assemblies are typically large. Some vehicles use larger wheel assemblies mounted on the frame of strollers or similar vehicles to change their usage mode. However, mounting large wheel assemblies to the frame often lifts the frame upwards, shifting the vehicle's center of gravity upwards and reducing the stability of the items carried. Public content

[0004] The purpose of this disclosure is to provide a new vehicle to solve one or more problems of the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this disclosure is: a vehicle, the vehicle comprising:

[0006] The vehicle frame body has a base frame, and a connecting structure is provided on the base frame;

[0007] The first wheel assembly includes a first wheel seat and a first wheel body rotatably disposed on the first wheel seat about a first axis. The first wheel seat is provided with a first mating structure that can be detachably connected to the connecting structure.

[0008] The second wheel assembly includes a second wheel seat and a second wheel body rotatably mounted on the second wheel seat about a second axis. The diameter of the second wheel body is larger than the diameter of the first wheel body. The second wheel seat is provided with a second mating structure that can be detachably connected to the connecting structure.

[0009] The vehicle has a first state in which the first wheel assembly is connected to the main frame body, and a second state in which the second wheel assembly is connected to the main frame body.

[0010] In a first state, the first mating structure and the connecting structure are connected to each other, such that the base frame and the first axis have a first distance in the vertical direction; in a second state, the second mating structure and the connecting structure are connected to each other, such that 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.

[0011] In some embodiments, the connection structure includes a plug extending downward from the base frame, the plug being detachably connected to both the first mating structure and the second mating structure.

[0012] In some embodiments, the first mating structure includes a connecting body that protrudes from the first wheel seat toward the plug, and the connecting body and the plug are provided with a mating structure that engages with each other. When the connecting body and the plug are engaged, the length of the mating body is greater than the length of either the connecting body or the plug.

[0013] In some embodiments, the engagement structure includes an engagement groove disposed on one of the connector and the plug, the other being capable of being inserted into the engagement groove, wherein the depth of the engagement groove is less than the length of the connector and the length of the plug.

[0014] In some embodiments, the second mating structure is a plug groove provided on the second wheel seat, and at least a portion of the plug can be mated and inserted into the plug groove.

[0015] In some embodiments, the second wheel seat is provided with a protrusion, the protrusion being disposed in a direction perpendicular to the extension direction of the connector, the connector groove being disposed on the protrusion, and the protrusion extending in a direction away from the connector.

[0016] In some embodiments, when the connector mates with the first mating structure, the connector is entirely located above the first axis; when the connector mates with the second mating structure, at least a portion of the connector is located below the second axis.

[0017] In some embodiments, the connector extends gradually backward from top to bottom, and the first mating structure and the second mating structure are detachably mated to the connector along the length extension direction of the connector.

[0018] In some embodiments, the first wheel assembly has two wheel seats and two wheel bodies that are spaced apart along the extension direction of the first axis; the second wheel assembly has two wheel seats and two wheel bodies that are spaced apart along the extension direction of the second axis, wherein the first mating structure, the second mating structure, and the connecting structure are all arranged in two sets that are spaced apart, and the spacing between the two sets of the first mating structures, the spacing between the two sets of the second mating structures, and the spacing between the two sets of the connecting structures are the same.

[0019] In some embodiments, the first wheel assembly includes a first connecting arm fixed between the two first wheel seats, such that the first wheel assembly can be integrally connected to or detached from the frame body;

[0020] The second wheel assembly includes a second connecting arm fixed between the two second wheel seats, allowing the second wheel assembly to be integrally connected to or detached from the frame body.

[0021] In some embodiments, the frame body is located between two sets of first wheels or between two sets of second wheels in the left-right direction, wherein the distance between the chassis and the first wheels in the left-right direction when the vehicle is in the first state is less than the distance between the chassis and the second wheels in the left-right direction when the vehicle is in the second state.

[0022] In some embodiments, the height of the chassis in the vertical direction is substantially the same in the first state and in the second state of the vehicle.

[0023] In some embodiments, the connecting structure is located at the rear of the vehicle frame body. The vehicle also includes a push rod frame, a tow bar, and a third wheel assembly. The push rod frame is movably connected to the vehicle frame body and has an open position relative to the vehicle frame body and a folded position relative to the vehicle frame body. The tow bar and the third wheel assembly are respectively folded or detachably connected to the vehicle frame body. In a first state, the third wheel assembly is mounted on the bottom front of the vehicle frame body, the first wheel assembly is mounted on the bottom rear of the vehicle frame body, the push rod frame is in the open position, and the tow bar is folded relative to the vehicle frame body or detached from the vehicle frame body. In a second state, the third wheel assembly is folded relative to the vehicle frame body or detached from the vehicle frame body, the second wheel assembly is mounted on the bottom rear of the vehicle frame body, the push rod frame is in the folded position, and the tow bar extends forward from the front of the vehicle frame body.

[0024] In some embodiments, the push rod frame includes two sets of push rods disposed on the left and right sides, the frame body is located between the two sets of push rods in the left-right direction, and one end of the push rod is rotatably connected to the frame body; the vehicle also includes a linkage rod movably disposed between the push rod and the frame body, when the vehicle is in the second state, a clearance space is formed between the frame body and the second wheel, when the push rod frame is in the folded position, both the push rod and the linkage rod are located within the clearance space, and the linkage rod is supported on the second wheel seat.

[0025] In some embodiments, one end of the linkage rod is rotatably connected to a slider, the slider being slidably disposed on the push rod along the length extension direction of the push rod, and the other end of the linkage rod is rotatably connected to the base frame. When the push rod frame is in the open position, the push rod has a first use state of extending upward from front to back, and a second use state of extending upward gradually from back to front.

[0026] In some embodiments, the second wheel seat includes a wheel seat body and a connecting portion extending from the wheel seat body in a left-right direction outward from the frame body. The second wheel is rotatably connected to the end of the connecting portion away from the wheel seat body. When the vehicle is in the second state, the linkage rod is supported on the connecting portion.

[0027] In some embodiments, the vehicle frame body further includes a frame assembly disposed on the underframe, the frame assembly enclosing a frame-shaped load-bearing space above the underframe.

[0028] Due to the application of the above technical solution, this disclosure has the following advantages compared with the prior art: The vehicle of this disclosure has replaceable first wheel components and second wheel components. Users can connect the first wheel components or second wheel components to the frame body according to different usage scenarios or different usage needs, enriching the usage scenarios of the vehicle and avoiding waste of resources. At the same time, the first gap is greater than the second gap, so that the height of the frame body in the vertical direction is basically the same in the first state and the second state of the vehicle, avoiding excessive raising or lowering of the frame body after replacing the wheel components, thereby avoiding affecting the stability of the vehicle carrying the goods. Attached Figure Description

[0029] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 is a three-dimensional structural diagram of a vehicle in a first state according to a specific embodiment of the present disclosure;

[0031] Figure 2 is a partially exploded view of Figure 1;

[0032] Figure 3 is an enlarged view of point A in Figure 2;

[0033] Figure 4 is a three-dimensional structural diagram of the vehicle of this disclosure in the second state;

[0034] Figure 5 is a partially exploded view of Figure 4;

[0035] Figure 6 is an enlarged view of point B in Figure 5;

[0036] Figure 7 is a three-dimensional schematic diagram of part of the structure in Figure 4;

[0037] Figure 8 is a partially exploded view of the mounting base of this disclosure;

[0038] Wherein: 110, base frame; 120, mounting base; 121, mounting hole; 130, connector; 140, upper frame; 141, first support rod; 142, second support rod; 150, support frame;

[0039] 210. First wheel assembly; 211. First wheel seat; 212. First wheel body; 213. Connector; 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. Insertion groove; 224. Second connecting arm;

[0040] 300. Third wheel assembly; 310. Wheel frame; 320. Wheel axle; 330. Third wheel body;

[0041] 400. Tow bar; 410. Bar body; 420. Connecting part; 430. Connecting component;

[0042] 500, push rod holder; 510, push rod; 520, push handle;

[0043] 610. Linkage rod; 620. Sliding component. Detailed Implementation

[0044] The technical solutions in the embodiments of this application will now be clearly and completely described with reference to the accompanying drawings, so that the advantages and features of this disclosure 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 this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0045] The following descriptions of directions such as front, back, left, right, up, and down are defined with reference to the directions observed by the user when using the vehicle, and are intended only to clearly illustrate the relative positional relationships of the various components in the vehicle.

[0046] Referring to Figures 1 and 4, a vehicle 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 provided. 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, and the user can choose to connect either the first wheel assembly 210 or the second wheel assembly 220 to the frame body according to different usage scenarios or different usage needs.

[0047] 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. Because the first wheel assembly 210 is smaller, the vehicle is more agile in the first state when moving and turning. The larger second wheel assembly 220 provides better grip, maintaining stability at higher speeds, and is also more durable and has a longer service life. Therefore, in the second state, the vehicle is suitable for scenarios requiring high speeds, high stability, or high wheel assembly durability. For example, in this second 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.

[0048] In the first state, the first mating structure on the first wheel assembly 210 engages with the connecting structure on the chassis 110, creating a first vertical distance between the chassis 110 and the first axle centerline X1. In the second state, the second mating structure on the second wheel assembly 220 engages with the connecting structure on the chassis 110, creating a second vertical distance between the chassis 110 and the second axle centerline X2. The first distance is greater than the second distance, ensuring that the bottom surface of the vehicle frame is at approximately the same vertical height in both states. This prevents the vehicle frame from being excessively raised after replacing the first wheel assembly 210 with the second wheel assembly 220, or excessively lowered after replacing the second wheel assembly 220 with the first wheel assembly 210, thus avoiding any impact on load-bearing stability.

[0049] Specifically, referring to Figure 7, the connecting structure on the base frame 110 includes a connector 130 extending downward from the base frame 110. The connector 130 can connect to either the first mating structure or the second mating structure. When the connector 130 mates with the first mating structure, the connector 130 is entirely located above the first axis X1; when the connector 130 mates with the second mating structure, at least a portion of the connector 130 is located below the second axis X2. This reduces the distance between the second axis X2 and the base frame 110, effectively reducing the second distance. Consequently, when the second wheel assembly 220 is connected to the connecting structure, the base frame 110 does not rise excessively upwards, ensuring that the vertical height of the base frame 110 is substantially the same in both the first and second states of the vehicle.

[0050] In this embodiment, the first mating structure includes a connecting body 213 protruding from the first wheel seat 211 toward the plug 130, as shown in Figure 3. The connecting body 213 protrudes upward from the first wheel seat 211, and a mating structure is provided between the connecting body 213 and the plug 130. When the connecting body 213 and the plug 130 are mated, the length of the mating body is greater than the length of either the connecting body 213 or the plug 130. Specifically, the mating structure includes a mating groove 214, which is provided on one of the connecting body 213 and the plug 130. The other part can be mated and inserted into the mating groove 214. The depth of the mating groove 214 is less than the length of the connecting body 213 and the length of the plug 130.

[0051] Referring to Figure 6, in this embodiment, the second mating structure is a plug groove 223 provided on the second wheel seat 221, and at least a portion of the plug 130 can be mated in the plug groove 223.

[0052] In this embodiment, as shown in Figure 7, the connector 130 gradually extends backward from top to bottom, and the first mating structure and the second mating structure are detachably mated and connected to the connector 130 along the length extension direction of the connector 130.

[0053] Referring to Figure 3, in this embodiment, the engagement groove 214 is disposed on the connecting body 213, which extends upward and forward inclinedly from the first wheel seat 211. The engagement groove 214 also gradually extends forward inclinedly from bottom to top, and the entire engagement groove 214 is located above the first axis X1. In this embodiment, the insertion groove 223 extends downward and backward from above the second axis X2, and extends to the rear side of the second axis X2 and below the second axis X2. Thus, when the connector 12 is inserted into the insertion groove 223, at least a portion of the connector 130 is located below the second axis X2.

[0054] In this embodiment, referring to Figure 6, the second wheel seat 221 is provided with a protrusion 2211. The protrusion 2211 is generally arranged in an extension direction perpendicular to the connector 130. The connector groove 223 is provided on the protrusion 2211, and the protrusion 2211 extends in a direction away from the connector 130. Specifically, the second wheel seat 221 includes a wheel seat body 2210, the protrusion 2211 extends rearward from the wheel seat body 2210, and the second wheel seat 221 also includes a connecting portion 2212 extending in a left-right direction. The connecting portion 2212 extends from the wheel seat body 2210 to the outside of the frame body, and the second wheel 222 is rotatably connected to the end of the connecting portion 2212 away from the wheel seat body 2210. Referring to Figure 6, here, the protrusion 2211 extends from above the connecting portion 2212 to the rear side of the connecting portion 2212.

[0055] In this embodiment, the first wheel assembly 210 has two first wheel seats 211 and two first wheel bodies 212, each spaced apart along the extension direction of the first axis X1; the second wheel assembly 220 has two second wheel seats 221 and two second wheel bodies 222, each spaced apart along the extension direction of the second axis X2. The first mating structure, the second mating structure, and the connecting structure are all arranged in two sets at intervals, with the same spacing between the two sets of first mating structures, the same spacing between the two sets of second mating structures, and the same spacing between the two sets of connecting structures.

[0056] In this embodiment, the first wheel assembly 210 includes a first connecting arm 215 fixed between two first wheel seats 211, which allows the first wheel assembly 210 to be integrally connected to or detached from the frame body. Similarly, in this embodiment, the second wheel assembly 220 includes a second connecting arm 224 fixed between two second wheel seats 221, which allows the second wheel assembly 220 to be integrally connected to or detached from the frame body.

[0057] In this embodiment, the connecting structure is located at the rear of the vehicle frame body, and the vehicle also includes 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 vehicle frame body and has an open position relative to the vehicle frame body and a folded position relative to the vehicle frame body. The tow bar 400 and the third wheel assembly 300 are respectively foldable or detachably connected to the vehicle frame body.

[0058] In the first state, as shown in Figure 1, the third wheel assembly 300 is installed at the bottom front of the frame body, the first wheel assembly 210 is installed at the bottom rear of the frame body, the push rod frame 500 is in the open 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 together maintain the stability of the frame body, so that the vehicle as a whole is stably supported on the ground and can move relative to the ground. The vehicle can be used as a standalone trolley or trailer for transporting goods or carrying children.

[0059] In the second state, as shown in Figure 4, the third wheel assembly 300 is folded down relative to or detached from the frame body, the second wheel assembly 220 is mounted on the bottom rear of the frame body, the push rod bracket 500 is in the folded position, and the tow bar 400 extends forward from the front of the frame body. In this state, the vehicle can be secured to the rear of a bicycle or other movable vehicle via the tow bar 400.

[0060] In this embodiment, a mounting base 120 is fixedly provided at the front of the vehicle frame body. One end of the tow bar 400 can be detachably connected to the mounting base 120 via a connector 430. When the vehicle is in a first state, the tow bar 400 is detached from the mounting base 120; when the vehicle is in a second state, the tow bar 400 is connected to the mounting base 120. Specifically, as shown in Figure 8, the mounting base 120 has a mounting hole 121, and one end of the tow bar 400 can be inserted into the mounting hole 121. As shown in Figure 5, the tow bar 400 includes a bar body 410 and a plug-in portion 420 extending from one end of the bar body 410. The plug-in portion 420 extends in the left-right direction and can be inserted into the mounting hole 121.

[0061] In this embodiment, the connector 430 detachably connects the mounting base 120 and the traction rod 400 along a connection direction that extends perpendicular to the direction in which the traction rod 400 is inserted into the mounting hole 121. Specifically, referring to Figure 8, the connector 430 can be a locking pin. Both the mounting base 120 and the insertion portion 420 of the traction rod 400 are provided with locking holes. When the connector 430 is inserted into the locking hole of the mounting base 120 and simultaneously into the locking hole of the insertion portion 420, the locking pin locks the mounting base 120 and the traction rod 400, preventing them from being separated. In this embodiment, when the locking pin is inserted vertically into the locking holes of the interconnected mounting base 120 and the insertion portion 420, it locks the mounting base 120 and the traction rod 400. When the locking pin is disengaged from the locking holes of the mounting base 120 and the insertion portion 420, the insertion portion 420 can be detached from the mounting hole 121.

[0062] In this embodiment, the push rod frame 500 includes two sets of push rods 510 disposed on the left and right sides. The vehicle frame body is located between the two sets of push rods 510 in the left-right direction, and one end of the push rod 510 is rotatably connected to the vehicle frame body. In this embodiment, the push rod frame 500 also includes a push handle 520 extending in the left-right direction. Referring to Figure 1, in the first state, the push handle 520 is connected between the upper ends of the two sets of push rods 510. In this state, the user can hold the push handle 520 to drive the vehicle to move. Specifically, the push rod 510 is rotatably connected to the front of the base frame 110. In the first state, the push rod frame 500 extends in the vertical direction and unfolds relative to the base frame 110. In the second state, the push rod frame 500 is folded above the base frame 110.

[0063] In this embodiment, with the push rod holder 500 in the open position, the push rod 510 has a first usage state where it extends upwards from front to back, and a second usage state where it extends upwards from back to front. In the first usage state, the push rod 520 is located at the rear of the frame body, and the vehicle is used as a trolley. The user can hold the push rod 520 and push it forward to move the vehicle forward. In the second usage state, the push rod 520 is located at the front of the frame body. In this state, the vehicle can be used as a trailer, and the user can pull the push rod holder 500 forward to move the vehicle forward.

[0064] In this embodiment, referring to Figure 3, in the second state, the frame body is positioned between the two sets of second wheels 222 in the left-right direction, and the frame body and the second wheels 222 are spaced apart. Furthermore, the left-right distance between the frame body and the second wheels 222 in this second state is greater than the left-right distance between the frame body and the first wheels 212 in the first state. When the push rod frame 500 is in the folded position, a clearance space is formed between the frame body and the second wheels 222 to accommodate the push rod 510, facilitating the folding of the push rod 510 between the second wheels 222 and the frame body. In this embodiment, the second wheels 222 are higher than the base frame 110, and the clearance space facilitates the downward folding of the push rod frame 500 relative to the base frame 110.

[0065] 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.

[0066] When the vehicle is in the first state and the push rod 510 is in the first use state, as shown in Figure 1, the linkage rod 610 extends in the vertical direction, and the push rod 510, the linkage rod 610, and the base frame 110 form a triangular structure to maintain the state of the push rod frame 500. In the second state, as shown in Figures 3 and 5, the linkage rod 610 changes to extend in the front-rear direction, and both the push rod 510 and the linkage rod 610 are located within the clearance space, with the lower linkage rod 610 supported on the second wheel seat 221, specifically on the connecting part 2212.

[0067] 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.

[0068] In this embodiment, referring to Figure 2, 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.

[0069] The main body of the frame also includes a frame assembly mounted on the underframe 110, which encloses a frame-shaped load-bearing space above the underframe 110. In this embodiment, the frame assembly includes an upper frame 140 located above the underframe 110 and a support frame 150 connecting the upper frame 140 and the underframe 110. Referring to Figure 1, the upper frame 140 includes a first rail 141 extending in the front-rear direction and a second rail 142 extending in the left-right direction. The first rail 141 includes two rails spaced apart in the left-right direction, and the second rail 142 includes two rails spaced apart in the front-rear direction. The two first rails 141 and the two second rails 142 are connected end-to-end to form a closed frame. The support frame 150 includes two sets spaced apart in the front-rear direction, and the two sets of support frames 150 are respectively connected between the two second rails 142 and the underframe 110. In this embodiment, the support frame 150 can be folded up and down, so that the upper frame 140 can be folded relative to the base frame 110, thereby reducing the space occupied by the vehicle when it is not in use.

[0070] In summary, the vehicle of this 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 vehicle itself can maintain stability and can be used independently. 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 suitable vehicle via the tow bar 400 and used as a trailer. In both the first and second states, the vertical height of the frame body is basically the same, and the stability of the vehicle when carrying objects is not affected.

[0071] The above embodiments are only for illustrating the technical concept and features of this disclosure. Their purpose is to enable those skilled in the art to understand the content of this disclosure and implement it. They should not be used to limit the scope of protection of this disclosure. All equivalent changes or modifications made based on the substance of this disclosure should be covered within the scope of protection of this disclosure.

Claims

1. A vehicle, characterized in that, The vehicle includes: The vehicle frame body has a base frame, and a connecting structure is provided on the base frame; The first wheel assembly includes a first wheel seat and a first wheel body rotatably disposed on the first wheel seat about a first axis. The first wheel seat is provided with a first mating structure that can be detachably connected to the connecting structure. The second wheel assembly includes a second wheel seat and a second wheel body rotatably mounted on the second wheel seat about a second axis. The diameter of the second wheel body is larger than the diameter of the first wheel body. The second wheel seat is provided with a second mating 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 main frame body, and a second state in which the second wheel assembly is connected to the main frame body. In a first state, the first mating structure and the connecting structure are connected to each other, and the base frame and the first axis have a first distance in the vertical direction; in a second state, the second mating structure and the connecting structure are connected to 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.

2. The vehicle according to claim 1, characterized in that: The connection structure includes a plug extending downward from the base frame, which can be detachably connected to both the first mating structure and the second mating structure.

3. The vehicle according to claim 2, characterized in that: The first mating structure includes a connecting body that protrudes from the first wheel seat toward the plug. The connecting body and the plug are provided with a mating structure that engages with each other. The length of the mating body formed after the connecting body and the plug are engaged is greater than the length of either the connecting body or the plug.

4. The vehicle according to claim 3, characterized in that: The joining structure includes a joining groove, which is disposed on one of the connector and the plug, and the other can be inserted into the joining groove. The depth of the joining groove is less than the length of the connector and the length of the plug.

5. The vehicle according to claim 2, characterized in that: The second mating structure is a plug groove provided on the second wheel seat, and at least a portion of the plug can be mated and inserted into the plug groove.

6. The vehicle according to claim 5, characterized in that: The second wheel seat is provided with a protrusion, which is arranged in a direction perpendicular to the extension direction of the connector. The insertion groove is provided on the protrusion, and the protrusion extends in a direction away from the connector.

7. The vehicle according to claim 2, characterized in that: When the connector mates with the first mating structure, the connector is entirely located above the first axis; when the connector mates with the second mating structure, at least a portion of the connector is located below the second axis.

8. The vehicle according to claim 2, characterized in that: The connector extends gradually backward from top to bottom, and the first mating structure and the second mating structure are detachably mated and connected to the connector along the length extension direction of the connector.

9. The vehicle according to claim 1, characterized in that: In the first wheel assembly, both the first wheel seat and the first wheel body are arranged in two spaced-apart configurations along the extension direction of the first axis; in the second wheel assembly, both the second wheel seat and the second wheel body are arranged in two spaced-apart configurations along the extension direction of the second axis, wherein the first mating structure, the second mating structure, and the connecting structure are all arranged in two sets spaced-apart configurations, and the spacing between the two sets of the first mating structures, the spacing between the two sets of the second mating structures, and the spacing between the two sets of the connecting structures are the same.

10. The vehicle according to claim 9, characterized in that: The first wheel assembly includes a first connecting arm fixed between the two first wheel seats, such that the first wheel assembly can be integrally connected to or detached from the frame body; The second wheel assembly includes a second connecting arm fixed between the two second wheel seats, allowing the second wheel assembly to be integrally connected to or detached from the frame body.

11. The vehicle according to claim 9, characterized in that: The main body of the vehicle frame is located between the two sets of the first wheels or between the two sets of the second wheels in the left-right direction. In the first state, the distance between the chassis and the first wheels in the left-right direction is smaller than the distance between the chassis and the second wheels in the left-right direction in the second state.

12. The vehicle according to claim 1, characterized in that: In the first state and in the second state, the height of the chassis in the vertical direction is substantially the same.

13. The vehicle according to any one of claims 1 to 12, characterized in that: The connecting structure is located at the rear of the vehicle frame body. The vehicle also includes a push rod frame, a tow bar, and a third wheel assembly. The push rod frame is movably connected to the vehicle frame body and has an open position relative to the vehicle frame body and a folded position relative to the vehicle frame body. The tow bar and the third wheel assembly are respectively foldable or detachably connected to the vehicle frame body. In the first state, the third wheel assembly is mounted on the bottom front of the frame body, the first wheel assembly is mounted on 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 down 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 folded position, and the tow bar extends forward from the front of the frame body.

14. The vehicle according to claim 13, characterized in that: The push rod frame includes two sets of push rods disposed on the left and right sides, and the frame body is located between the two sets of push rods in the left-right direction. One end of each push rod is rotatably connected to the frame body. The vehicle also includes a linkage rod movably disposed between the push rod and the frame body. When the vehicle is in the second state, a clearance space is formed between the frame body and the second wheel. When the push rod frame is in the folded position, both the push rod and the linkage rod are located within the clearance space, and the linkage rod is supported on the second wheel seat.

15. The vehicle according to claim 14, characterized in that: One end of the linkage rod is rotatably connected to a sliding member, which is slidably mounted on the push rod along the length extension direction of the push rod. The other end of the linkage rod is rotatably connected to the base frame. When the push rod frame is in the open position, the push rod has a first use state of extending upward from front to back and a second use state of gradually extending upward from back to front.

16. The vehicle according to claim 14, characterized in that: The second wheel seat includes a wheel seat body and a connecting portion extending from the wheel seat body in a left-right direction to the outside of the frame body. The second wheel is rotatably connected to the end of the connecting portion away from the wheel seat body. When the vehicle is in the second state, the linkage rod is supported on the connecting portion.

17. The vehicle according to claim 13, characterized in that: The main body of the vehicle frame also includes a frame assembly mounted on the underframe, which encloses a frame-shaped load-bearing space above the underframe.

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