A kind of anti-sinking stretch limiting device for house car side extension box

Abstract

The utility model relates to the field of house car parts structure, concretely relates to a kind of anti-sinking stretch limiting device for house car side extension box, including vehicle body and two groups of side extension box, two groups the side extension box is arranged in the both sides of the vehicle body, and the side extension box can be slid outward along the side edge of the vehicle body, the side extension box both sides are provided with telescopic cable-stayed mechanism, the cable-stayed mechanism one end is movably connected on the upper portion of the vehicle body, and the other end is movably connected on the bottom edge of the side extension box. By obliquely arranged telescopic pull rod to form stable triangular support structure, the weight of the box is effectively dispersed to the entire vehicle body frame, rather than only by slide rail, this design eliminates the problem of excessive load bearing of slide rail from the stress source, avoids the failure caused by long-term fatigue deformation of slide rail, significantly prolongs the service life of side extension box and slide rail, ensures long-term stable operation of side extension structure.

Description

Technical Field

[0001] This utility model relates to the field of RV component structure, specifically to an anti-sinking and stretching limiting device for the side-extension box of an RV. Background Technology

[0002] With the continued growth in demand for RV travel and outdoor excursions, RV space expansion functionality has become a core feature for enhancing user experience. Side-expanding modules, as a key structure for flexible space expansion, have seen a significant increase in application across various types of self-propelled and towed RVs. Currently, the extension and retraction of mainstream RV side-expanding modules primarily relies on heavy-duty sliding rail components for support and translation. This involves connecting the side-expanding module to the RV frame via rails, and using a drive mechanism to slide the module outwards along the rails to increase living and storage space. Retracting it inwards restores the RV's compact dimensions, meeting the needs of road travel and parking.

[0003] However, once the existing side-expanding box structure is deployed, its overall weight is borne solely by the sliding rails on both sides or by the telescopic outriggers, which are essentially jacks. The sliding rails must continuously withstand the downward vertical pressure and the cantilever moment at the extended end of the side-expanding box. Because the sliding rails themselves are long, rigid structures, their stress points are mainly concentrated on the fixed section connected to the vehicle body and the movable section connected to the side-expanding box. Under the influence of long-term repeated extension and contraction, weight load fluctuations, and the bumps of complex outdoor road conditions, uneven stress can easily lead to problems such as bending deformation of the sliding rails, accelerated wear of the internal sliding structure of the sliding rails, and loosening of the bolts connecting the sliding rails and the box.

[0004] Specifically, deformation of the slide rail can obstruct the extension and retraction of the side expansion box, resulting in jamming, abnormal noise, or even inability to push and pull smoothly, which seriously affects the user's operating experience. Especially in outdoor environments, the difficulty of fault repair increases significantly. To alleviate the stress on the sliding rails, some RV manufacturers have attempted an improved solution using additional outriggers for support. This involves adding manually or electrically retractable outriggers to the bottom of the extended side enclosure. When deployed, the outriggers provide support by contacting the ground, distributing the load across the sliding rails. However, installing these outriggers requires additional space at the bottom of the side enclosure, increasing structural complexity and manufacturing costs. Furthermore, the outriggers require a flat surface for support when deployed, making them unstable on unpaved surfaces or sloping terrain, resulting in poor adaptability. Each time the side enclosure is operated, users must simultaneously deploy, level, and retract the outriggers, increasing the complexity of the operation, especially for elderly users or single-person operation scenarios, significantly reducing ease of use. Utility Model Content

[0005] The purpose of this utility model is to provide an anti-sinking and tension limiting device for the side-extension box of a motorhome in order to solve the above-mentioned problems. The device uses diagonally arranged telescopic rods to form a stable triangular support structure, which effectively distributes the weight of the box to the entire vehicle frame, rather than relying solely on the slide rail. This design eliminates the problem of excessive load on the slide rail from the source of stress, avoids failures caused by long-term fatigue deformation of the slide rail, significantly extends the service life of the side-extension box and the slide rail, and ensures the long-term stable operation of the side-extension structure. See the following description for details.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This utility model provides an anti-sinking and stretching limiting device for the side extension box of a motorhome, including a vehicle body and two sets of side extension boxes. The two sets of side extension boxes are arranged on both sides of the vehicle body, and the side extension boxes can slide outward along the side of the vehicle body. Both sides of the side extension box are provided with a retractable inclined pull mechanism. One end of the inclined pull mechanism is movably connected to the upper part of the vehicle body, and the other end is movably connected to the bottom edge of the side extension box. The inclined pull mechanism includes an upper pull rod and a lower pull rod distributed in parallel. The bottom end of the upper pull rod is fixed with a sliding frame that accommodates the sliding passage of the lower pull rod. One end of the lower pull rod that extends out of the sliding frame is fixed with a limit baffle. The middle part of the limit baffle is threaded with a stop screw that abuts against the top side of the sliding frame. The stop screw, together with the limit baffle and the sliding frame, forms a rigid fulcrum that limits the sliding extension and retraction length of the inclined pull mechanism.

[0007] The above-mentioned anti-sinking and stretching limiting device for the side extension box of a motorhome is used in which, during the process of the side extension box sliding outward to the outside of the vehicle body, the sliding telescopic structure composed of the upper and lower pull rods is gradually stretched. Since the inclined pull mechanism is connected to the diagonal position of the side extension box, the two pull rods unfold synchronously with the sliding opening of the side extension box. The inclined pull mechanism, the side extension box, and the vehicle body form a triangular support until the side extension box moves to the end of its stroke. At this time, the end of the stop screw installed in the limiting baffle is pressed against the top side of the sliding frame, that is, the upper and lower limit points are tightly pressed and matched, so that the entire inclined pull mechanism is stressed and tightened. Finally, the inclined pull mechanism, the side extension box, and the vehicle body form a solid triangular support point, distributing the weight of the side extension box to the entire vehicle body, rather than being entirely borne by the slide rail that supports the side extension box to slide out. When it is necessary to adjust the stretching endpoint of the inclined tensioning mechanism, rotate the stop screw to adjust its length through the limit baffle, thereby changing the installation position of the stop screw on the limit baffle, thus adjusting the overall length of the inclined tensioning mechanism when stretched to the rigid support position, so as to adapt to the reinforcement of side expansion box with different outward extension distances. While maintaining the synchronous unfolding of the two sets of side expansion boxes, the motor drives the two sets of driving gears to rotate in opposite directions, which in turn drives the two sets of driven gears and the inner sprocket to rotate in opposite directions. Through the transmission action of the transmission chain between the inner and outer sprockets, the two outer side shafts are synchronously driven to rotate in opposite directions. Then, the side gears of the side shafts drive the rack to slide horizontally, so that the rack drives the side expansion box to unfold outward or retract inward along the side cavity of the vehicle body. At the same time, the swing arm of the synchronization frame maintains the synchronicity of the sliding movement of the top edge of the two sets of side expansion boxes, ensuring that the side expansion boxes retract or unfold smoothly.

[0008] Preferably, the top end of the upper pull rod is rotatably connected to the inner side of the upper part of the vehicle body, and the bottom end of the lower pull rod is rotatably connected to the outer side wall of the bottom edge of the side box.

[0009] Preferably, both sides of the vehicle body are provided with side cavities to accommodate the sliding extension box, and the bottom of the side extension box is fixed with a support frame, and a side drive component is provided in the side beam of the vehicle bottom inside the side cavities on both sides.

[0010] Preferably, the support frame includes a frame fixed to the bottom side of the side expansion box, and the frame has racks on both the front and rear sides of the bottom, the racks extending along the sliding direction of the side expansion box.

[0011] Preferably, a side beam top opening is provided on the bottom side of the side cavity, and the side drive component includes a side shaft rotatably disposed in the middle of the vehicle body. A side gear is fixed to the outside of the side shaft. The top side of the side gear extends upward into the side cavity along the side beam top opening, and the top side of the side gear meshes with the rack.

[0012] Preferably, a drive assembly is provided in the middle of the vehicle body, and an outer sprocket is fixed to one end of the side shaft near the drive assembly. The drive assembly includes a motor fixed in the vehicle body, and two sets of meshing drive gears are provided on the outside of the motor. The output end of the motor meshes with one of the sets of drive gears.

[0013] Preferably, two drive shafts are rotatably mounted in the vehicle body on both sides of the motor. One end of each drive shaft is fixed with a driven gear, and the two driven gears mesh with two sets of driving gears respectively. The other end of each drive shaft is fixed with an inner sprocket. A transmission chain connects the inner sprocket and the outer sprocket on the same side of the motor.

[0014] Preferably, the system also includes a timing frame, which is located in the middle of the vehicle body. The timing frame includes an optical axis extending along the length of the vehicle body. Sliding sleeves are slidably provided on the outer sides of both ends of the optical axis. Two swing arms, respectively connecting two sets of side-mounted boxes, are hinged to both sides of the sliding sleeves.

[0015] The beneficial effects are as follows: 1. This utility model uses obliquely arranged telescopic rods to form a stable triangular support structure. When the side-extending box extends to the end of its stroke, the rods simultaneously reach their maximum extension length. The upper and lower limit points fit tightly together, causing the device to be stressed and tightened. Ultimately, the weight of the box is effectively distributed to the entire vehicle frame, rather than being borne solely by the slide rail. This design eliminates the problem of excessive load on the slide rail from the root of the stress, avoids failures caused by long-term fatigue deformation of the slide rail, significantly extends the service life of the side-extending box and the slide rail, and ensures the long-term stable operation of the side-extending structure.

[0016] 2. This application achieves effective support for the lower outer side of the side-expanding box by directly using a triangular support rod, eliminating the need for additional support legs. This reduces the cost of parts procurement and production assembly, and simplifies the user's operation process. Users only need to control the extension and retraction of the side-expanding box, without having to handle the support leg-related operations. This reduces the user's burden and operational threshold, and improves ease of use.

[0017] 3. The rack of the bottom support frame of the side-expanding box moves with the frame. The fixed gear meshes with the rack to achieve drive. At the same time, the outer diagonal tie rod suspends the frame, forming a structural cooperation between drive and support. The gear positioning ensures the positional accuracy during the extension and retraction of the box, while the diagonal tie rod suspension provides stable support for the frame. The combination of the two effectively avoids the side-expanding box from shifting or shaking during extension and retraction and parking, improves the stability and reliability of side-expanding operation, further optimizes the user experience, and reduces the risk of structural damage caused by drive or positioning problems. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is the main view structural diagram of this utility model; Figure 2 This is a three-dimensional structural schematic diagram of the present invention; Figure 3 This is a structural breakdown diagram of the present invention; Figure 4 This is a partial structural disassembly diagram of this utility model; Figure 5 This is a structural breakdown diagram of the side-expanding box body and the inclined tension mechanism of this utility model; Figure 6 This is a partial structural thumbnail diagram of the cable-stayed mechanism of this utility model; Figure 7This is a three-dimensional structural schematic diagram of the side drive component of this utility model; Figure 8 This is a structural disassembly diagram of the drive component of this utility model; Figure 9 This is a front view structural diagram of the vehicle body of this utility model; Figure 10 This is a utility model Figure 9 The structural cross-sectional view at point AA.

[0020] The annotations in the attached figures are explained as follows: 1. Car body; 101. Side cavity; 102. Top opening of side beam; 2. Side-mounted box body; 3. Inclined pull mechanism; 301. Upper pull rod; 301a. Sliding frame; 302. Lower pull rod; 302a. Limiting baffle; 302b. Stop screw; 4. Support frame; 401. Rack; 402. Frame; 5. Side drive component; 501. Side shaft; 502. Side gear; 503. Outer sprocket; 6. Drive assembly; 601. Motor; 602. Drive gear; 603. Drive shaft; 604. Inner sprocket; 605. Driven gear; 7. Synchronizer; 701. Optical shaft; 702. Sliding sleeve; 703. Swing arm. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0022] It should be noted that all directional and positional terms used in this utility model, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connections between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0023] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] See Figures 1-10 As shown, this utility model provides an anti-sinking stretching limit device for the side extension box of a motorhome, including a vehicle body 1 and two sets of side extension boxes 2. The two sets of side extension boxes 2 are arranged on both sides of the vehicle body 1, and the side extension boxes 2 can slide outward along the side of the vehicle body 1 along the slide rail to meet the space expansion needs of the motorhome in the parked state, providing users with a more spacious living, storage or activity space. At the same time, in the driving state, they can be retracted to both sides of the vehicle body 1 to ensure that the overall size of the motorhome meets the road driving regulations. Both sides of the side extension box 2 are provided with retractable inclined pull mechanisms 3, which serve as the core anti-sinking support components after the side extension box 2 is unfolded. Specifically, one end of the inclined pull mechanism 3 is movably connected to the upper part of the vehicle body 1, and the other end is movably connected to the bottom edge of the side extension box 2. Thus, the inclined pull mechanism 3, the vehicle body 1, and the side extension box 2 together form a stable triangular support system, which prevents the side extension box 2 from sinking due to the lack of support on the lower outer side after it is fully unfolded, thereby preventing the slide rail from being deformed by excessive force over a long period of time. The inclined pull mechanism 3 includes an upper pull rod 301 and a lower pull rod 302 distributed in parallel. The bottom end of the upper pull rod 301 is fixed with a sliding frame 301a that accommodates the sliding passage of the lower pull rod 302. One end of the lower pull rod 302 that extends out of the sliding frame 301a is fixed with a limit baffle 302a. The middle of the limit baffle 302a is threaded with a stop screw 302b that abuts against the top side of the sliding frame 301a. The stop screw 302b, together with the limit baffle 302a and the sliding frame 301a, forms a rigid fulcrum that limits the sliding extension and retraction length of the inclined pull mechanism 3. This is used to precisely control the maximum extension stroke of the inclined pull mechanism 3, ensuring that the inclined pull mechanism 3 can simultaneously reach a tensioned state when the side expansion box 2 is extended to the preset position. This avoids the problem of component damage due to excessive extension of the inclined pull mechanism 3, or insufficient extension that fails to form effective support, thus ensuring the stability of the support and the safety of the structure.

[0026] As an optional implementation, the top end of the upper pull rod 301 is rotatably connected to the inner side of the upper part of the vehicle body 1, and the bottom end of the lower pull rod 302 is rotatably connected to the outer side wall of the bottom edge of the side-extending box 2. With this configuration, the angle of the inclined pull mechanism 3 can be flexibly adjusted during the extension and retraction of the side-extending box 2 through the rotatable connection structure at both ends of the upper and lower pull rods 302, ensuring that the pull rod can always be extended or retracted synchronously with the sliding of the box, avoiding jamming or structural pulling caused by fixed angle. At the same time, after the box is extended, the rotatable connection point can adaptively disperse some of the lateral stress, further improving the support stability. Both sides of the vehicle body 1 are provided with side cavities 101 to accommodate the sliding extension box 2. The bottom of the extension box 2 is fixed with a support frame 4. The side drive component 5 is provided in the vehicle bottom side beam inside the side cavities 101 to provide a stable sliding track and power source for the extension box 2. With this configuration, the extension box 2 can be stored and guided by the side cavities 101, avoiding the extension box 2 from being exposed when it is retracted and affecting driving safety. At the same time, the support frame 4 supports the overall weight of the extension box 2 and transmits driving force. The side drive component 5 is built into the vehicle bottom side beam, which can effectively protect the drive structure from external impacts or harsh environmental corrosion and extend the service life of the drive components. The support frame 4 includes a frame 402 fixed to the bottom side of the side expansion box 2. The frame 402 has racks 401 on both the front and rear sides of the bottom. The racks 401 extend along the sliding direction of the side expansion box 2, so that the weight of the side expansion box 2 is evenly transferred to the racks 401 through the frame 402. This setting can ensure that the side expansion box 2 is subjected to balanced force during the extension and retraction process, and avoid box displacement or jamming caused by single-point drive. At the same time, the double racks 401 on the front and rear sides can further improve the driving stability and prevent the box from tilting forward and backward during the sliding process. A side beam top opening 102 is provided on the bottom side of the side cavity 101. The side drive component 5 includes a side shaft 501 rotatably disposed in the middle of the vehicle body 1. A side gear 502 is fixed to the outside of the side shaft 501. The top side of the side gear 502 extends upward into the side cavity 101 along the side beam top opening 102, and the top side of the side gear 502 meshes with the rack 401. This arrangement facilitates the precise engagement of the side gear 502 and the rack 401 through the side beam top opening 102, ensuring the stability of the meshing transmission. At the same time, the built-in design of the side shaft 501 and the side gear 502 can reduce the impact of external dust and rainwater on the transmission components and reduce the probability of wear. In addition, compared with the traditional slide rail separate drive, the meshing transmission method of the gear and rack 401 can more accurately control the sliding speed and position of the side box 2, improving the smoothness of operation. A drive assembly 6 is provided in the middle of the vehicle body 1. An outer sprocket 503 is fixed to one end of the side shaft 501 near the drive assembly 6. The drive assembly 6 includes a motor 601 fixed in the vehicle body 1. Two sets of meshing drive gears 602 are provided on the outside of the motor 601. The output end of the motor 601 meshes with one set of drive gears 602. Two drive shafts 603 are rotatably mounted in the vehicle body 1 on both sides of the motor 601. One end of each drive shaft 603 is fixed with a driven gear 605, and the two driven gears 605 mesh with two sets of driving gears 602 respectively. The other end of each drive shaft 603 is fixed with an inner sprocket 604. A transmission chain (not shown in the figure) connects the inner sprocket 604 and the outer sprocket 503 on the same side of the motor 601. This chain transmits power from the motor 601 to the side shafts 501 on both sides through the meshing of the driving gears 602 and driven gears 605, and then, with the help of the transmission chain, through the inner sprocket 604, outer sprocket 503, and transmission chain. This power drives the side gears 502 to rotate, ultimately achieving synchronous extension and retraction of the side extension boxes 2 on both sides. The step frame 7 and the synchronization frame 7 are located in the middle of the vehicle body 1. The synchronization frame 7 includes an optical shaft 701 extending along the length of the vehicle body 1. Sliding sleeves 702 are slidably provided on the outer sides of both ends of the optical shaft 701. Two swing arms 703 are hinged on both sides of the sliding sleeves 702, which are respectively connected to the two sets of side expansion boxes 2. As a synchronization correction component during the extension and retraction of the side expansion boxes 2, it is used to adjust the sliding speed and position of the two side expansion boxes 2 in real time through the transmission cooperation between the swing arms 703 and the sliding sleeves 702. This avoids the problem of asynchronous extension and retraction, offset or jamming of the boxes caused by slight differences in the drive components 6 on both sides. It ensures that the two sets of side expansion boxes 2 always maintain symmetrical expansion or contraction, further improving structural stability and operational safety, while reducing additional wear on components such as slide rails and gears caused by asynchrony.

[0027] With the above structure, during use, as the side extension box 2 slides outward to the outside of the vehicle body 1, the sliding telescopic structure composed of the upper pull rod 301 and the lower pull rod 302 is gradually lengthened. Since the inclined pull mechanism 3 is connected to the diagonal position of the side extension box 2, the two pull rods slide open and unfold synchronously with the side extension box 2. The inclined pull mechanism 3, the side extension box 2, and the vehicle body 1 form a triangular support until the side extension box 2 moves to the end of the stroke. At this time, the end of the stop screw 302b installed in the limit baffle 302a abuts against the top side of the slide frame 301a, that is, the upper and lower limit points are tightly abutted and fitted, so that the entire inclined pull mechanism 3 is tensioned. Finally, the inclined pull mechanism 3, the side extension box 2, and the vehicle body 1 form a solid triangular support point, distributing the weight of the side extension box 2 to the whole vehicle body, rather than being entirely borne by the slide rail that supports the side extension box 2 to slide out. When it is necessary to adjust the stretching endpoint of the inclined tensioning mechanism 3, rotate the stop screw 302b to adjust its length through the limiting baffle 302a, thereby changing the installation position of the stop screw 302b on the limiting baffle 302a, thereby adjusting the overall length of the inclined tensioning mechanism 3 when stretched to the rigid support position, so as to adapt to the reinforcement of the side expansion box 2 with different outward extension distances. While keeping the two sets of side expansion boxes 2 unfolding synchronously, the motor 601 drives the two sets of driving gears 602 to rotate in opposite directions, thereby driving the two sets of driven gears 605 and the inner sprocket 604 to rotate in opposite directions. Through the transmission action of the transmission chain between the inner sprocket 604 and the outer sprocket 503, the two outer side shafts 501 are driven to rotate in opposite directions synchronously. Then, the side gears 502 of the side shafts 501 drive the rack 401 to slide horizontally, so that the rack 401 drives the side expansion box 2 to unfold outward or retract inward along the side cavity 101 of the vehicle body 1. At the same time, the swing arm 703 of the synchronous frame 7 maintains the synchronicity of the sliding movement of the top edge of the two sets of side expansion boxes 2, ensuring that the side expansion box 2 retracts or unfolds smoothly. A stable triangular support structure is formed by diagonally arranged telescopic rods. When the side extension box 2 extends to its end point of travel, the rods simultaneously reach their maximum extension length. The upper and lower limit points fit tightly together, tightening the device under stress. Ultimately, the weight of the box is effectively distributed to the entire frame 402 of the vehicle body 1, rather than being borne solely by the slide rail. This design eliminates the problem of excessive load on the slide rail at its source, avoids failures caused by long-term fatigue deformation of the slide rail, significantly extends the service life of the side extension box 2 and the slide rail, and ensures the long-term stable operation of the side extension structure.

[0028] This application achieves effective support for the lower outer side of the side-expanding box 2 directly through the triangular support rod, without the need for additional support legs. This reduces the cost of parts procurement and production assembly, and simplifies the user's operation process. Users only need to control the extension and retraction of the side-expanding box 2, without having to deal with the support legs. This reduces the user's burden and operating threshold, and improves ease of use.

[0029] The rack 401 of the bottom support frame 4 of the side-expanding box 2 moves with the frame 402. The fixed gear meshes with the rack 401 to achieve drive. At the same time, the outer diagonal tie rod suspends the frame 402, forming a structural cooperation between drive and support. The gear positioning ensures the positional accuracy during the extension and retraction of the box, while the diagonal tie rod suspension provides stable support for the frame 402. The combination of the two effectively avoids the side-expanding box 2 from shifting or shaking during extension and retraction and parking, improves the stability and reliability of side-expanding operation, further optimizes the user experience, and reduces the risk of structural damage caused by drive or positioning problems.

[0030] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A device for preventing sinking and stretching of a side-mounted enclosure in a motorhome, comprising a vehicle body (1) and two sets of side-mounted enclosures (2), wherein the two sets of side-mounted enclosures (2) are arranged on both sides of the vehicle body (1), and the side-mounted enclosures (2) can slide outward along the side of the vehicle body (1), characterized in that: Both sides of the side-expanding box (2) are provided with retractable inclined pull mechanism (3). One end of the inclined pull mechanism (3) is movably connected to the upper part of the vehicle body (1), and the other end is movably connected to the bottom edge of the side-expanding box (2). The inclined pull mechanism (3) includes an upper pull rod (301) and a lower pull rod (302) distributed in parallel. The bottom end of the upper pull rod (301) is fixed with a sliding frame (301a) that accommodates the sliding passage of the lower pull rod (302). One end of the lower pull rod (302) that protrudes from the sliding frame (301a) is fixed with a limit baffle (302a). The middle part of the limit baffle (302a) is threaded with a stop screw (302b) that abuts against the top side of the sliding frame (301a). The stop screw (302b), together with the limit baffle (302a) and the sliding frame (301a), forms a rigid fulcrum that limits the sliding extension length of the inclined pull mechanism (3).

2. The anti-sinking and stretching limiting device for the side-mounted box of a motorhome according to claim 1, characterized in that: The top end of the upper pull rod (301) is rotatably connected to the inner side of the upper part of the vehicle body (1), and the bottom end of the lower pull rod (302) is rotatably connected to the outer side wall of the bottom edge of the side box body (2).

3. The anti-sinking and tensile limiting device for the side-extension box of a motorhome according to claim 1, characterized in that: Both sides of the vehicle body (1) are provided with side cavities (101) for accommodating the sliding extension box (2), and the bottom side of the side extension box (2) is fixed with a support frame (4). Both sides of the side cavity (101) are provided with side drive components (5) in the side beams of the vehicle bottom.

4. The anti-sinking and tensile limiting device for the side-spread box of a motorhome according to claim 3, characterized in that: The support frame (4) includes a frame (402) fixed to the bottom side of the side expansion box (2). The frame (402) has racks (401) on both the front and rear sides of the bottom. The racks (401) extend along the sliding direction of the side expansion box (2).

5. The anti-sinking and tensile limiting device for the side-spread box of a motorhome according to claim 4, characterized in that: The side cavity (101) is provided with a side beam top opening (102) on the bottom side. The side drive component (5) includes a side shaft (501) rotatably disposed in the middle of the vehicle body (1). A side gear (502) is fixed to the outside of the side shaft (501). The top side of the side gear (502) extends upward into the side cavity (101) along the side beam top opening (102), and the top side of the side gear (502) meshes with the rack (401).

6. The anti-sinking and tensile limiting device for the side-spread box of a motorhome according to claim 5, characterized in that: A drive assembly (6) is provided in the middle of the vehicle body (1). An outer sprocket (503) is fixed to one end of the side shaft (501) near the drive assembly (6). The drive assembly (6) includes a motor (601) fixed in the vehicle body (1). Two sets of meshing drive gears (602) are provided on the outside of the motor (601). The output end of the motor (601) meshes with one of the sets of drive gears (602).

7. The anti-sinking and tensile limiting device for the side-spread box of a motorhome according to claim 6, characterized in that: Two drive shafts (603) are rotatably mounted in the vehicle body (1) on both sides of the motor (601). One end of the drive shaft (603) is fixed with a driven gear (605), and the two sets of driven gears (605) mesh with two sets of driving gears (602) respectively. The other end of the drive shaft (603) is fixed with an inner sprocket (604). A transmission chain connects the inner sprocket (604) and the outer sprocket (503) on both sides of the motor (601) and located on the same side.

8. The anti-sinking and tensile limiting device for the side-spread box of a motorhome according to claim 7, characterized in that: It also includes a synchronization frame (7), which is located in the middle of the vehicle body (1). The synchronization frame (7) includes an optical axis (701) extending along the length of the vehicle body (1). Sliding sleeves (702) are slidably provided on the outer sides of both ends of the optical axis (701). Two swing arms (703) that connect to two sets of side-mounted boxes (2) are hinged on both sides of the sliding sleeves (702).

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