Camping wagon having stable structure
By adopting a cross-X-shaped support link and guide sleeve structure on the camping vehicle chassis, the deformation problem caused by uneven stress on the chassis was solved, thereby improving structural stability and service life, while reducing production costs.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- YONGKANG DACHENG IND & TRADE CO LTD
- Filing Date
- 2024-11-20
- Publication Date
- 2026-05-21
AI Technical Summary
The chassis of existing camping vehicles is prone to deformation when heavy objects are placed on it, and the bottom pole is subjected to excessive stress, which leads to a shortened service life.
The second support link structure adopts a cross-X shape. Through the cooperation of the tie rod and the guide sleeve, the force on the base frame is distributed and the stability is increased. The smooth unfolding and folding are ensured by the stable connection between the sliding sleeve and the link.
It improves the structural stability of the camper vehicle chassis, avoids damage caused by single-point stress, extends service life, simplifies the unfolding and folding process, and reduces production costs.
Smart Images
Figure CN2024133344_21052026_PF_FP_ABST
Abstract
Description
A structurally stable camping vehicle Technical Field
[0001] This invention belongs to the field of camping vehicle technology, and specifically relates to a structurally stable camping vehicle. Background Technology
[0002] Camping vehicles, also known as camping cars, are a common mode of transportation for people during outdoor activities. They have a simple structure and are easy to fold and store, so more and more people are using camping vehicles for outdoor activities.
[0003] Most camping vehicles on the market consist of a vehicle body, on which tie rods and wheel assemblies are installed. To allow the vehicle body to fold fully, both the bottom and sides can be folded. For example, the fully foldable camping vehicle disclosed in Chinese Invention Patent CN 202220176947.8 includes tie rods, a frame, and wheels. The frame is divided into a base frame, front and rear frames, and side frames. The side frames include: uprights, first diagonal beams, folding beams, second diagonal beams, and connecting rods. There are two uprights, each equipped with a fixed seat and a lifting seat. The fixed seats are fixed to the top of the uprights, and the lifting seats are slidably mounted on the uprights. The two first diagonal beams are rotatably mounted on the two lifting seats respectively. The two ends of the folding beams are rotatably connected to one of the first diagonal beams respectively. One end of each of the two second diagonal beams is rotatably mounted on the two fixed seats respectively. The two second diagonal beams rotate on the same base and are rotatably connected to the first diagonal beams in a cross configuration. The end of the connecting rod is rotatably mounted on the second diagonal beams and the folding beam respectively. The base frame includes a central seat and a base rod. The bottom end of the base rod is rotatably connected to the central seat, so that the base rods are arranged radially with the central seat as the center. The base rods are divided into fixed rods and telescopic rods. The two ends of the fixed rods are rotatably connected to the bottom ends of the central seat and the upright support rod, respectively. The two ends of the telescopic rods are rotatably connected to the central seat and the base, respectively. There are two central seats, and four fixed rods and four telescopic rods. Two fixed rods and two telescopic rods are rotatably mounted on each central seat. In this structure, the items are supported by two central seats and base rods, and the base rods are connected to the side frame through the base, which helps to improve the stability of the base frame installation. In addition, this structure can shorten the length of the base rods and avoid the base rods from bending and being damaged due to excessive length.
[0004] In the above structure, if the items in the vehicle body are placed only on a central seat and the base rod connected to the central seat, the base frame is prone to deformation, and the base rod is prone to excessive stress and damage, affecting the service life of the campervan. Summary of the Invention
[0005] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a camping vehicle with a long service life and stable structure.
[0006] The objective of this invention is achieved as follows:
[0007] A structurally stable camping vehicle includes a body and wheels. A base frame is installed at the bottom of the body, and foldable end frames are installed at the front and rear ends of the body. A pull rod is movably installed on one end frame, and uprights are installed on both sides of the end frame. Foldable side frames are installed on the left and right sides of the body, and the two ends of the side frames are connected to the uprights on the two end frames respectively. The base frame includes two sets of first folding units, which are respectively connected to the two end frames. The first folding unit includes a connecting seat, and two first support links and two second support links are rotatably installed on the lower side of the connecting seat. The two first support links are rotatably connected to the uprights on both sides of the end frame, and the second support links on the two first folding units intersect each other to form an X shape, so that one first folding unit can support the other first folding unit.
[0008] The side frame is equipped with pull rods that are respectively connected to the first folding unit. A guide sleeve is slidably mounted on the pull rod. The guide sleeve is rotatably connected to the second support link. The side frame can pull the second support link through the pull rod and the guide sleeve.
[0009] The invention is further configured such that: the middle part of the second support link bends downward and a swing groove is formed on the upper side of the second support link; the second support link on another first folding unit passes through the swing groove and is connected to the pull rod; the swing groove can support the second support link.
[0010] The invention is further configured such that: the side frame includes two sets of second folding units, each second folding unit includes two second connecting rods hinged in an X shape, the two second connecting rods on the two sets of second folding units are rotatably connected respectively, a sliding sleeve is slidably provided on the pull rod, the pull rod is rotatably connected to one of the second connecting rods on the second folding unit, and the sliding sleeve is rotatably connected to the other second connecting rod on the second folding unit, the two second connecting rods, the sliding sleeve and the pull rod are combined to form a four-bar slider mechanism.
[0011] The invention is further configured such that: the sliding sleeve is provided with a sliding hole adapted to the pull rod, and a through hole and a countersunk hole are provided on the side wall of the sliding hole. The countersunk hole is located in the extension direction of the through hole, and the fastener can pass through the through hole and be installed in the countersunk hole, thereby enabling the fastener to rotatably connect the sliding sleeve and the second connecting rod.
[0012] The present invention is further configured such that: the sliding sleeve includes two sleeves spaced apart, the two sleeves are fixedly connected by a fixing rod, and the sleeves are slidably connected to the pull rod respectively.
[0013] The invention is further configured such that the pull rod is vertically arranged, and the two second connecting rods on the second folding unit are distributed in an isosceles triangle with the pull rod, thereby preventing the pull rod from swinging to both sides during the unfolding or folding of the two second connecting rods on the second folding unit.
[0014] The invention is further configured such that: the end frame includes a third folding unit disposed between the uprights, a sliding sleeve is slidably disposed on the uprights, the third folding unit includes two third connecting rods hinged in an X shape, one third connecting rod is rotatably connected to the uprights, the other third connecting rod is rotatably connected to the sliding sleeve, and one of the second connecting rods in the second folding unit is rotatably connected to the uprights, the sliding sleeve can drive the other second connecting rod in the second folding unit to move, thereby enabling the second folding unit and the third folding unit to fold synchronously.
[0015] The present invention is further configured such that: the end frame includes two sets of third folding units, two third connecting rods on the two sets of third folding units are rotatably connected respectively, a first hinge groove is provided on each of the two uprights, a second hinge groove adapted to the second connecting rod is provided on the sliding sleeve, and the two third connecting rods on one set of third folding units are bent relative to each other, so that the first hinge grooves on the two uprights are arranged opposite each other, and the second hinge grooves on the sliding sleeves on the two uprights are arranged opposite each other.
[0016] The present invention is further configured such that: two auxiliary connecting rods are rotatably arranged on the sliding sleeve, and the two auxiliary connecting rods are respectively rotatably connected to two second connecting rods in the second folding unit to form a four-bar linkage.
[0017] The present invention is further configured such that: the connecting seat is provided with a storage groove, and the storage groove is provided with a traction part, which can pull the connecting seat upward to move the first folding unit folded relative to each other.
[0018] The advantages of this invention compared to the prior art are:
[0019] In this invention, the second support rods on the two first folding units intersect to form an X-shape. When a heavy object is placed on the base frame, the second support rods on the two sets of first folding units can support each other, which helps improve the stability of the base frame structure and avoids the weight of the heavy object being concentrated on one first folding unit during use, thus preventing damage to the first folding unit. In addition, the intersecting second support rods in this structure can bear the force in the middle of the second support rod, avoiding bending damage due to excessive length, which helps extend the service life of the camping vehicle. The tie rods set on the side frame can provide traction support for the two sets of first folding units respectively, which helps to distribute the force on the side frame. This structure also disperses the support points of the base frame, which helps to improve the stability of the base frame installation. The guide sleeve facilitates the flexible connection between the base frame and the tie rod, making it convenient for the camping vehicle to unfold and fold, and convenient for the user.
[0020] In this invention, production and installation errors can easily lead to uneven extension and retraction of the base frame and side frame. If the second support link is directly rotatably connected to the tie rod, it can easily cause jamming during the unfolding and retraction of the campervan. The guide sleeve facilitates the flexible connection between the base frame and the tie rod, making it convenient for the campervan to unfold and fold, and for the user. The downward bending structure forming the swing groove facilitates the production and processing of the second support link, and the swing groove helps to reduce the height difference between the upper ends of the two first folding units, which helps to improve the flatness of the bottom of the vehicle body, facilitates the stable placement of items in the vehicle body, and makes it convenient for the user.
[0021] In this invention, the through holes and countersunk holes on the sidewall of the sliding hole facilitate the manufacturer's rotational connection between the sliding sleeve and the second connecting rod using fasteners, ensuring stable installation of the sliding sleeve and the second connecting rod and facilitating the assembly and production of the camping vehicle. The two spaced sleeves facilitate a stable connection between the sliding sleeve and the pull rod, reducing skewing or shaking during use and promoting stable sliding of the sliding sleeve on the pull rod. Since the two second connecting rods and the pull rod are distributed in an isosceles triangle, it prevents the pull rod from skewing during the unfolding or folding of the camping vehicle, thus facilitating the unfolding and folding of the camping vehicle and making it convenient for users.
[0022] The sliding sleeve in this invention facilitates the synchronous folding of the second and third folding units, making it easy to unfold and fold the campervan and convenient for users. The relatively curved third link facilitates the opposite arrangement of the first and second hinge slots on both sides of the end frame, making it easier for manufacturers to assemble the campervan. This structure also helps to reduce the types of parts and molds used in the campervan, thereby reducing production costs. The two auxiliary links facilitate the flexible unfolding and folding of the second folding unit, reducing jamming during use and making it easier for users to unfold and fold the campervan.
[0023] The towing mechanism in this invention allows users to quickly control the folding of the chassis, making it convenient for users to use. The storage slot facilitates the concealment and storage of the towing mechanism, preventing it from protruding from the top of the chassis and affecting the placement of items by the user inside the campervan. Attached Figure Description
[0024] Figure 1 is a schematic diagram of the structure of the present invention;
[0025] Figure 2 is a diagram of the folded state of the present invention;
[0026] Figure 3 is an exploded schematic diagram of the vehicle body in this invention;
[0027] Figure 4 is a schematic diagram of the structure of the first folding unit in this invention;
[0028] Figure 5 is a schematic diagram of the connecting seat in this invention;
[0029] Figure 6 is a schematic diagram of the guide sleeve in this invention;
[0030] Figure 7 is a schematic diagram of the structure of the second folding unit in this invention;
[0031] Figure 8 is a schematic diagram of the end frame structure in this invention;
[0032] Figure 9 is a structural schematic diagram of the third folding unit in this invention;
[0033] Figure 10 is a schematic diagram of the tie rod in this invention;
[0034] Figure 11 is a cross-sectional view of the sliding sleeve in this invention.
[0035] The labels in the diagram mean: 1-base frame; 11-first folding unit; 111-connecting seat; 112-first support link;
[0036] 113-Second support link; 114-Swing groove; 115-Traction part; 116-Guide sleeve; 117-Guide hole;
[0037] 118-Support wall; 119-Storage slot; 1111-Moveable slot; 1112-Firming wall; 2-Side shelf;
[0038] 21-Second folding unit; 211-Second connecting rod; 212-Auxiliary connecting rod; 213-First hinge hole;
[0039] 214 - Second hinge hole; 3 - End frame; 31 - Third folding unit; 32 - Upright pole; 33 - Sliding sleeve;
[0040] 311 - Third connecting rod; 321 - Upper connecting end; 322 - First hinge slot; 323 - Third hinge slot;
[0041] 324 - Lower connecting end; 325 - Connecting groove; 331 - Second hinge groove; 332 - Fourth hinge groove; 4 - Pull rod;
[0042] 41-Ring body; 42-Limiting sleeve; 43-Third hinge hole; 5-Sliding sleeve; 51-Sleeve; 52-Fixing rod;
[0043] 53 - Sliding hole; 54 - Through hole; 55 - Countersunk hole. Detailed Implementation
[0044] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:
[0045] Referring to Figures 1 to 11, a structurally stable camping vehicle includes a vehicle body and wheels. A base frame 1 is provided at the bottom of the vehicle body, and foldable end frames 3 are provided at the front and rear ends of the vehicle body. A pull rod is movably provided on one end frame 3. Uprights 32 are provided on both sides of the end frame 3. Foldable side frames 2 are provided on the left and right sides of the vehicle body. The two ends of the side frames 2 are connected to the uprights 32 on the two end frames 3 respectively. The base frame 1 includes two sets of first folding units 11. The two sets of first folding units 11 are respectively connected to the two end frames 3. The first folding unit 11 includes a connecting seat 111. Two first support connecting rods 112 and two second support connecting rods 113 are rotatably provided on the lower side of the connecting seat 111. The two first support connecting rods 112 are rotatably connected to the uprights 32 on both sides of the end frame 3 respectively. Pull rods 4 are movably provided on the two second support connecting rods 113 respectively. The second support connecting rods 113 on the two first folding units 11 intersect each other to form an X shape, so that one first folding unit 11 can support the other first folding unit 11.
[0046] The side frame 2 includes two sets of second folding units 21. Each second folding unit 21 includes two second connecting rods 211 hinged in an X-shape. The two second connecting rods 211 on the two sets of second folding units 21 are rotatably connected. A sliding sleeve 5 is slidably provided on the pull rod 4. The pull rod 4 is rotatably connected to one of the second connecting rods 211 on the second folding unit 21, and the sliding sleeve 5 is rotatably connected to the other second connecting rod 211 on the second folding unit 21. The two second connecting rods 211, the sliding sleeve 5, and the pull rod 4 are combined to form a four-bar slider mechanism.
[0047] In the above structure, the second support rods 113 on the two first folding units 11 intersect to form an X shape. When a heavy object is placed on the base frame 1, the second support rods 113 on the two sets of first folding units 11 can support the two first folding units 11 against each other, which helps to improve the stability of the base frame 1 structure and avoids the weight of the heavy object being concentrated on one first folding unit 11 during use, thus preventing damage to the first folding unit 11. In addition, the intersecting second support rods 113 in this structure can bear the force in the middle of the second support rods 113, avoiding bending damage to the second support rods 113 due to excessive length, which helps to extend the service life of the camping vehicle.
[0048] In this invention, the second support link 113 is bent downward in the middle and forms a swing groove 114 on the upper side of the second support link 113. The second support link 113 on another first folding unit passes through the swing groove 114 and is connected to the pull rod 4. The swing groove 114 can support the second support link 113. The downward bending structure to form the swing groove 114 facilitates the production and processing of the second support link 113. Moreover, the setting of the swing groove 114 helps to reduce the height difference between the upper ends of the two first folding units 11, which helps to improve the flatness of the bottom of the vehicle body, facilitates the stable placement of items in the vehicle body, and makes it convenient for users to use.
[0049] In this embodiment, a swing groove 114 is provided on the upper side of another second support link 113 located below a second support link 113. In actual assembly and production, swing grooves 114 can be provided on both second support links 113 on the same first folding unit 11, or a second support link 113 with a swing groove 114 can be provided on each of the two first folding units 11. In the accompanying drawings of this invention, swing grooves 114 are provided on both second support links 113 on the same first folding unit 11.
[0050] Production and installation errors can easily lead to uneven extension and retraction of the base frame 1 and side frame 2. If the second support link 113 is directly rotatably connected to the pull rod 4, it can easily cause jamming during the unfolding and retraction of the campervan. Preferably, the pull rod 4 is slidably provided with a guide sleeve 116, the guide sleeve 116 is adapted to the guide hole 117 of the side frame 2, the guide sleeve 116 is rotatably connected to the second support link 113, and the guide sleeve 116 is provided with a support wall 118 for supporting the second support link 113. The guide sleeve 116 facilitates the flexible connection between the base frame 1 and the pull rod 4, making it convenient for the campervan to unfold and fold, and convenient for the user.
[0051] In this embodiment, the pull rod 4 includes a rod body 41, a guide sleeve 116 is slidably disposed on the rod body 41, and a limit sleeve 42 is fixedly disposed at the lower end of the rod body 41. The limit sleeve 42 can prevent the guide sleeve 116 from detaching from the rod body 41, and the limit sleeve 42 can support the guide sleeve 116.
[0052] The sliding sleeve 5 is provided with a sliding hole 53 that is adapted to the tie rod 4. The side wall of the sliding hole 53 is provided with a through hole 54 and a countersunk hole 55. The countersunk hole 55 is located in the extension direction of the through hole 54. Fasteners can pass through the through hole 54 and be installed in the countersunk hole 55, so that the fasteners rotatably connect the sliding sleeve 5 and the second connecting rod 211. The through hole 54 and the countersunk hole 55 on the side wall of the sliding hole 53 make it easy for the manufacturer to rotatably connect the sliding sleeve 5 and the second connecting rod 211 with fasteners, which facilitates the stable installation of the sliding sleeve 5 and the second connecting rod 211 and facilitates the assembly and production of the camping vehicle.
[0053] The sliding sleeve 5 described in this invention includes two sleeves 51 spaced apart. The two sleeves 51 are fixedly connected by a fixing rod 52. The sleeves 51 are slidably connected to the pull rod 4 respectively. The spaced-apart sleeves 51 facilitate the stable connection between the sliding sleeve 5 and the pull rod 4, reduce skewing or shaking during use, and promote the stable sliding of the sliding sleeve 5 on the pull rod 4.
[0054] In this embodiment, the pull rod 4 is vertically arranged, and the two second connecting rods 211 on the second folding unit 21 are distributed in an isosceles triangle with the pull rod 4, thereby preventing the pull rod 4 from swinging to both sides during the unfolding or folding of the two second connecting rods 211 on the second folding unit 21. This structure can prevent the pull rod 4 from tilting during the unfolding or folding of the campervan, thus facilitating the unfolding and folding of the campervan and making it convenient for users to use.
[0055] The upper part of the rod body 41 is provided with a third hinge hole 43, one second connecting rod 211 is provided with a first hinge hole 213, and another second connecting rod 211 is provided with a second hinge hole 214. The first hinge hole 213 and the second hinge hole 214 are vertically distributed, and the second hinge hole 214 is located between the first hinge hole 213 and the limiting sleeve 42. The fastener passes through the first hinge hole 213 and the third hinge hole 43 and rotatably connects the pull rod 4 to the second connecting rod 211. The fastener passes through the countersunk hole 55 and the second hinge hole 214 and rotatably connects the sliding sleeve 5 to the other second connecting rod 211.
[0056] The end frame 3 includes a third folding unit 31 disposed between uprights 32. A sliding sleeve 33 is slidably disposed on the uprights 32. The third folding unit 31 includes two third connecting rods 311 hinged in an X-shape. One third connecting rod 311 is rotatably connected to the uprights 32, and the other third connecting rod 311 is rotatably connected to the sliding sleeve 33. One of the second connecting rods 211 in the second folding unit 21 is rotatably connected to the uprights 32. The sliding sleeve 33 can drive the other second connecting rod 211 in the second folding unit 21 to move, so that the second folding unit 21 and the third folding unit 31 can be folded synchronously. The sliding sleeve 33 facilitates the synchronous folding of the second folding unit 21 and the third folding unit 31, making it easy for the camper to unfold and fold, and convenient for the user.
[0057] In this embodiment, the upper and lower ends of the upright 32 are respectively fixedly provided with an upper connecting end 321 and a lower connecting end 324. The upper connecting end 321 is provided with a first hinge groove 322 adapted to the third connecting rod 311 and a third hinge groove 323 adapted to the second connecting rod 211. The sliding sleeve 33 is provided with a second hinge groove 331 adapted to another third connecting rod 311 on the third folding unit 31. The lower connecting end 324 is provided with a connecting groove 325 adapted to the first supporting connecting rod 112.
[0058] Preferably, the end frame 3 includes two sets of third folding units 31, with two third connecting rods 311 on each set of third folding units 31 rotatably connected. Each of the two uprights 32 is provided with a first hinge groove 322, and the sliding sleeve 33 is provided with a second hinge groove 331 adapted to the second connecting rod 211. The two third connecting rods 311 on each set of third folding units 31 are bent relative to each other, thereby causing the first hinge grooves 322 on the two uprights 32 to be positioned opposite each other, and causing the second hinge grooves on the sliding sleeve 33 on the two uprights 32 to be positioned relative to each other. The relative arrangement of the third connecting rod 311 and the relative bending of the third connecting rod 331 facilitates the relative arrangement of the first hinge slot 322 and the second hinge slot 331 on both sides of the end frame 3, which makes it convenient for manufacturers to assemble the camping vehicle. This structure also helps to reduce the types of parts and molds of the camping vehicle, thereby reducing the production cost of the camping vehicle. In this invention, the third connecting rod 311 is provided with a bending part 312, and the bending part 312 on the third connecting rod 311 of the same third folding unit 31 bends toward the other third connecting rod 311.
[0059] In this embodiment, two auxiliary connecting rods 212 are rotatably arranged on the sliding sleeve 33. The sliding sleeve 33 is provided with a fourth hinge groove 332 that is adapted to the auxiliary connecting rods 212. The two auxiliary connecting rods 212 are respectively rotatably connected to the two second connecting rods 211 in the second folding unit 21 to form a four-bar linkage. The arrangement of the two auxiliary connecting rods 212 facilitates the flexible unfolding and folding of the second folding unit 21, reduces the jamming of the second folding unit 21 during use, facilitates the unfolding and folding of the camping vehicle, and makes it convenient for users to use.
[0060] The connecting seat 111 is provided with a storage slot 119, and a traction part 115 is provided in the storage slot 119. The connecting seat 111 can be pulled upward by the traction part 115, so that the first folding unit 11 can be folded relative to each other. The traction part 115 in this structure makes it easy for the user to quickly control the folding of the base frame 1, which is convenient for the user to use. The storage slot 119 makes it easy to hide and store the traction part 115, and avoids the traction part 115 protruding from the top of the base frame 1 and affecting the user's placement of items in the camping vehicle.
[0061] In this embodiment, the connecting seat 111 has four movable slots 1111 on its lower side. One end of the first support rod 112 and the second support rod 113 are respectively rotatably disposed in one movable slot 1111, and a pressing wall 1112 is provided on the upper side of the movable slot 1111. When the base frame 1 is unfolded, the first support rod 112 and the second support rod 113 are respectively pressed against the pressing wall 1112.
[0062] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.
Claims
1. A structurally stable camping vehicle, comprising a vehicle body and wheels, wherein a base frame (1) is provided at the bottom of the vehicle body, and foldable end frames (3) are provided at the front and rear ends of the vehicle body, a pull rod is movably provided on one end frame (3), and uprights (32) are provided on both sides of the end frame (3), and foldable side frames (2) are provided on the left and right sides of the vehicle body, wherein the two ends of the side frames (2) are respectively connected to the uprights (32) on the two end frames (3), characterized in that: The base frame (1) includes two sets of first folding units (11), which are respectively connected to two end frames (3). The first folding unit (11) includes a connecting seat (111). Two first support rods (112) and two second support rods (113) are rotatably arranged on the lower side of the connecting seat (111). The two first support rods (112) are respectively rotatably connected to the uprights (32) on both sides of the end frame (3). The second support rods (113) on the two first folding units (11) intersect each other to form an X shape, so that one first folding unit (11) can support the other first folding unit (11). The side frame (2) is provided with a pull rod (4) that is connected to the first folding unit (11). A guide sleeve (116) is slidably provided on the pull rod (4). The guide sleeve (116) is rotatably connected to the second support link (113). The side frame (2) can pull the second support link (113) through the pull rod (4) and the guide sleeve (116).
2. A structurally stable camper as claimed in claim 1, characterized in that: The second support link (113) bends downward in the middle and forms a swing groove (114) on the upper side of the second support link (113). The second support link (113) on another first folding unit (11) passes through the swing groove (114) and is connected to the pull rod (4). The swing groove (114) can support the second support link (113).
3. A structurally stable camping vehicle as claimed in claim 1, wherein: The side frame (2) includes two sets of second folding units (21). Each second folding unit (21) includes two second connecting rods (211) hinged in an X shape. The two second connecting rods (211) on the two sets of second folding units (21) are rotatably connected. A sliding sleeve (5) is slidably provided on the pull rod (4). The pull rod (4) is rotatably connected to one of the second connecting rods (211) on the second folding unit (21), and the sliding sleeve (5) is rotatably connected to the other second connecting rod (211) on the second folding unit (21). The two second connecting rods (211), the sliding sleeve (5), and the pull rod (4) are combined to form a four-bar slider mechanism.
4. A structurally stable camper as claimed in claim 3, characterized in that: The sliding sleeve (5) is provided with a sliding hole (53) adapted to the pull rod (4). The sliding hole (53) has a through hole (54) and a countersunk hole (55) on its side wall. The countersunk hole (55) is located in the extension direction of the through hole (54). The fastener can pass through the through hole (54) and be installed in the countersunk hole (55), so that the fastener rotates the sliding sleeve (5) to the second connecting rod (211).
5. A structurally stable camper as claimed in claim 4, characterized in that: The sliding sleeve (5) includes two sleeves (51) spaced apart. The two sleeves (51) are fixedly connected by a fixing rod (52), and the sleeves (51) are slidably connected to the pull rod (4) respectively.
6. A structurally stable camping vehicle as claimed in claim 3, wherein: The pull rod (4) is vertically arranged, and the two second connecting rods (211) on the second folding unit (21) are distributed in an isosceles triangle with the pull rod (4), thereby preventing the pull rod (4) from swinging to both sides during the unfolding or folding process of the two second connecting rods (211) on the second folding unit (21).
7. A structurally stable camping vehicle as claimed in claim 3, wherein: The end frame (3) includes a third folding unit (31) disposed between the uprights (32). A sliding sleeve (5) is slidably disposed on the uprights (32). The third folding unit (31) includes two third connecting rods (311) hinged in an X shape. One third connecting rod (311) is rotatably connected to the upright (32), and the other third connecting rod (311) is rotatably connected to the sliding sleeve (5). One of the second connecting rods (211) in the second folding unit (21) is rotatably connected to the upright (32). The sliding sleeve (5) can drive the other second connecting rod (211) in the second folding unit (21) to move, so that the second folding unit (21) and the third folding unit (31) can be folded synchronously.
8. A structurally stable camper as claimed in claim 7, characterized in that: The end frame (3) includes two sets of third folding units (31), and two third connecting rods (311) on the two sets of third folding units (31) are rotatably connected. Both uprights (32) are provided with first hinge grooves (322), and the sliding sleeve (5) is provided with second hinge grooves (331) that are adapted to the second connecting rod (211). The two third connecting rods (311) on the set of third folding units (31) are bent relative to each other, so that the first hinge grooves (322) on the two uprights (32) are arranged relative to each other, and the second hinge grooves (331) on the sliding sleeve (5) on the two uprights (32) are arranged relative to each other.
9. A structurally stable camper as defined in claim 8, wherein: Two auxiliary links (212) are rotatably mounted on the sliding sleeve (5). The two auxiliary links (212) are rotatably connected to the two second links (211) in the second folding unit (21) to form a four-bar linkage.
10. A structurally stable camping vehicle as claimed in claim 1, wherein: The connecting seat (111) is provided with a storage groove (119), and a traction part (115) is provided in the storage groove (119). The connecting seat (111) can be pulled upward by the traction part (115), so that the first folding unit (11) is folded relative to each other.