A vehicle subframe structure

Abstract

The application discloses a kind of refitting car subframe structures, including being set on chassis longitudinal beam above subframe, the subframe includes load box, cover and transverse support beam, the load box is across chassis longitudinal beam and is fixedly connected on chassis longitudinal beam, the transverse support beam is across chassis longitudinal beam and is fixedly connected on chassis longitudinal beam, the upper end of load box and transverse support beam is fixedly connected with cover, the cover is used as mounting plane for installing the upper compartment of motor home above, the application is by subframe using fixedly connected on longitudinal beam load box and fixed on the cover structure of load box, increase the strength of chassis longitudinal beam, reduce the complicated framework structure, make structure simple, light in weight, low in cost, storage space utilization is high, it is convenient to mass production, improve production efficiency;And motor home gravity center is in the middle, so that motor home travels more stable, safe.

Description

Technical Field

[0001] This invention relates to the field of RV technology, and more specifically to a subframe structure for a modified vehicle. Background Technology

[0002] Currently, as a type of modified vehicle, motorhomes are gradually becoming an essential mode of transportation for travelers. Structurally, motorhomes require a subframe, which is connected to the chassis longitudinal beams by bolts, welding, or other means. The subframe elevates the longitudinal beams to create a larger working surface.

[0003] In existing technologies, subframes are generally constructed using 40 or 50 mm square steel beams spliced ​​together to form a frame structure. These subframes are connected to the chassis longitudinal beams via column-shaped supports. This structure is complex and costly. Due to the material specifications and the weight of the square steel itself, the floor cannot be raised too high. Furthermore, the frame structure causes items to be scattered along the sides of the longitudinal beams, resulting in low space utilization and making it difficult to achieve a low center of gravity design for the entire vehicle. While this type of integrated subframe, composed of intersecting longitudinal and transverse beams connected to the longitudinal beams via supports, offers high strength, it is also heavy, costly, and has limited internal storage space, resulting in extremely low space utilization. Especially when a motorhome encounters sudden braking or acceleration during travel, its support components need to withstand various loads (inertial centrifugal load, bending load, torsional load) generated by the superstructure and sudden stop or start, resulting in significant gravity, front-to-back tension, and torsional force. However, due to the fact that the forces generated in the existing technology are transmitted to the longitudinal beams through each support component, the contact area between the support component and the longitudinal beam is small, which causes high stress in each support component, significantly reducing its service life and easily causing deformation at the contact points between the support component and the superstructure. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems and provide a modified vehicle subframe structure. A brand-new RV subframe structure is set on the chassis, which makes the RV chassis more reasonably stressed, reduces the weight of the frame, and improves the space utilization effect.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A modified vehicle subframe structure includes a subframe disposed above a chassis longitudinal beam. The subframe includes a load-bearing box, a cover plate, and a transverse support beam. The load-bearing box spans the chassis longitudinal beam and is fixedly connected to it. The transverse support beam spans the chassis longitudinal beam and is fixedly connected to it. The upper ends of the load-bearing box and the transverse support beam are fixedly connected to the cover plate. The area above the cover plate serves as an installation surface for mounting the upper body of the motorhome.

[0007] Furthermore, the load-bearing box is fixedly connected to a fixing connecting plate, which is attached to the side of the chassis longitudinal beam and fixedly connected to it. The fixing connection between the fixing connecting plate and the chassis longitudinal beam is achieved by one or a combination of bolting, riveting, and welding; riveting is preferred.

[0008] The load-bearing box is fixedly connected to the chassis longitudinal beam by a fixed connecting plate, and the cover plate is fixedly connected to the transverse support beam and the load-bearing box respectively, so that the subframe forms an integral box beam structure on the longitudinal beam. The fixed connecting plate has a large fixed connection area through surface contact. The load-bearing box is used as a structural connecting part of the subframe for connection, which is conducive to raising the longitudinal beam to obtain a larger plane and facilitates the design of space utilization.

[0009] Furthermore, the bottom surface of the carrier box is placed on the upper surface of the chassis longitudinal beam, and the carrier box is located above the wheel axle of the RV.

[0010] By placing the bottom of the load-bearing box on the chassis longitudinal beams to make them fit together, the downward load-bearing force of the load-bearing box can be directly applied to the chassis longitudinal beams, thereby improving the vertical load-bearing capacity.

[0011] Furthermore, a first partition is provided in the middle of the carrier box. One side chamber of the first partition serves as a water tank for storing water, while the other side chamber of the first partition stores batteries.

[0012] By using the load-bearing box to store heavy objects and placing it on the longitudinal beams and between the wheels, the problem of unstable center of gravity caused by the complex subframe structure is perfectly solved.

[0013] Furthermore, the transverse support beam includes a transverse support plate and a first flange fixedly connected to both ends of the transverse support plate, the first flange being arranged perpendicular to the transverse support plate.

[0014] Furthermore, the front and rear ends of the cover plate are provided with vertically arranged second folded edges; the sides of the cover plate are all provided with vertical third folded edges, and the second folded edges and the third folded edges are combined around the cover plate to form a closed structure.

[0015] The cover plate, with its folded edges, is fixedly connected to the transverse support beams, load-bearing box, and auxiliary support box on the longitudinal beams to form a box girder body. This allows the load-bearing capacity of the upper loading compartment on the cover plate to be directly transferred to the longitudinal beams. Simultaneously, the folded edges of the cover plate improve its bending strength and load-bearing capacity.

[0016] Furthermore, an auxiliary support box is provided below the cover plate. The auxiliary support box is located between the transverse support beam and the load-bearing box and is used to support the cover plate.

[0017] Furthermore, the auxiliary support box is configured as a clean water tank for storing clean water, and a second partition is provided inside the auxiliary support box; the auxiliary support box is configured as a clean water tank for storing clean water, and a second partition is provided inside the auxiliary support box; a heating pipe is provided inside the auxiliary support box to heat the water inside the auxiliary support box, and the heated hot water inside the auxiliary support box provides a hot water source for the RV and provides underfloor heating for the bottom of the upper vehicle body.

[0018] Furthermore, the heating pipe is connected to the engine's cooling water, and the engine cooling water circulates through the heating pipe to heat the water in the auxiliary support box; or the heating pipe uses electrical energy stored by solar power generation for heating.

[0019] The auxiliary support box can be used to store clean water or for other storage purposes. Positioned on the vehicle's centerline, it helps balance the vehicle's weight and lowers the center of gravity. Additionally, the auxiliary support box can be equipped with heating pipes or utilize the heat conduction from the RV's engine to transfer the stored heat to the cover, thus providing heating and improving energy efficiency and environmental friendliness.

[0020] Furthermore, a mudguard is fixedly connected to the side of the load-bearing box near the wheel. The mudguard is located on the front and rear sides of the wheel. A support plate is fixedly connected to the lower end of the mudguard. A vertical plate is fixedly connected to the end of the support plate away from the mudguard. The vertical plate is fixedly connected to the chassis longitudinal beam.

[0021] Depending on the functional design of the rear-mounted RV, mudguards need to be installed near the front and rear sides of the load-bearing box and fixedly connected to the longitudinal beams to meet more functional needs of the rear-mounted RV and improve space utilization.

[0022] The modified vehicle subframe structure provided by this invention has the following beneficial effects:

[0023] 1. By fixing the load-bearing box to the chassis longitudinal beams with a fixed connecting plate, and connecting the load-bearing box cover plate to the transverse support beams and placing it on the longitudinal beams, an integral box beam structure is formed. The load-bearing box is used as a structural connector for the subframe, which enhances the strength of the chassis longitudinal beams and improves torsional resistance. This results in a simpler structural design, material savings, lighter weight, and lower cost. The load-bearing capacity of the upper body box on the cover plate is directly transferred to the chassis longitudinal beams, solving the problems of high cost and heavy weight caused by the complex frame structures in existing technologies. At the same time, it improves space utilization, facilitates mass production, and increases production efficiency.

[0024] 2. By positioning the load-bearing box above the wheel axle and placing the auxiliary support box on the vehicle's centerline, the strength of the chassis longitudinal beams is enhanced, and the vehicle's low center of gravity design is perfectly achieved, making the RV more stable and safer to drive.

[0025] 3. The cover plate is folded around to form a box-shaped structure, and the transverse support beam, load-bearing box and auxiliary support box are fixedly connected to the longitudinal beam to form a box beam box body. This solves the problem that the loads generated in various directions during sudden stops and accelerations during driving are transferred to the chassis longitudinal beams through the connected load-bearing boxes, which helps to extend the service life of the longitudinal beams and make the overall structure of the RV body and frame stable.

[0026] 4. The modified vehicle subframe structure provided by this invention adopts a box beam and cover plate structure, without a complex skeleton, which facilitates wiring harness routing, ensures uninterrupted space utilization, has a simple structure, low cost, simplifies installation process, and is easy to manufacture. Simultaneously, the auxiliary support box can serve as a clean water tank to heat and store thermal energy, utilizing heat conduction to provide heating for the cover plate and upper body, thus saving energy and protecting the environment. Attached Figure Description

[0027] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings:

[0028] Figure 1 A three-dimensional structural diagram of a modified vehicle subframe structure and chassis provided by the present invention. Figure 1 ;

[0029] Figure 2 A three-dimensional structural diagram of a modified vehicle subframe structure provided by the present invention. Figure 2 ;

[0030] Figure 3 This is a schematic diagram of the cross-sectional structure of the bearing box in this invention;

[0031] Figure 4 This is a schematic diagram of the cross-sectional structure of the auxiliary support box in this invention;

[0032] Figure 5 This is a schematic diagram of the connection structure of the fixed connecting plate in this invention. Figure 1 ;

[0033] Figure 6 This is a schematic diagram of the connection structure of the fixed connecting plate in this invention. Figure 2 ;

[0034] Figure 7 This is a schematic cross-sectional view of a modified vehicle subframe structure according to the present invention;

[0035] Figure 8 This is a schematic diagram of an embodiment in which the rear end of the chassis longitudinal beam is in a flat state.

[0036] Figure 9 This is a schematic diagram of the structure of an embodiment of the chassis longitudinal beam sinking at the rear in this invention;

[0037] Figure 10This is a schematic diagram of the structure of an embodiment of the chassis longitudinal beam lifting in this invention;

[0038] Figure 11 This is a three-dimensional structural diagram of a modified vehicle subframe structure with mudguards according to the present invention.

[0039] The following are the labeling instructions in the diagram: 1. Chassis longitudinal beam; 11. Vertical connecting beam; 12. Horizontal settlement beam; 13. L-shaped panel; 14. Horizontal lifting beam; 15. Bent panel; 2. Load-bearing box; 21. Fixed connecting plate; 22. First partition; 23. Battery; 3. Cover plate; 31. Second fold; 32. Third fold; 4. Transverse support beam; 41. First fold; 42. Transverse support plate; 5. Auxiliary support box; 51. Second partition; 52. Heating pipe; 6. Mudguard; 61. Support plate; 62. Vertical plate; 7. Storage cavity. Detailed Implementation

[0040] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be noted that in the embodiments of the present invention, all directional indications (such as up-down-left-right-forward-backward...) are only used to explain the relative positional relationship and movement between the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0043] This invention provides a modified vehicle subframe structure, such as... Figures 1-4As shown, the vehicle includes a subframe mounted above the chassis longitudinal beam 1. The subframe includes a load-bearing box 2, a cover plate 3, and a transverse support beam 4. The load-bearing box 2 spans across the chassis longitudinal beam 1, with its bottom surface in contact with the upper surface of the chassis longitudinal beam 1. This allows the load-bearing box 2 to be mounted on the chassis longitudinal beam 1, and the bottom of the load-bearing box 2 to be in close contact with the chassis longitudinal beam, so that the downward gravity load on the load-bearing box 2 is transferred to the chassis longitudinal beam 1 through the contact surface. The load-bearing box 2 is positioned above the axle of the RV's wheels, resulting in a shorter distance between the load-bearing box 2 and the wheels, reducing the lever arm of the force between the load-bearing box 2 and the chassis longitudinal beam 1, and thus reducing... The moment generated between the bearing box 2 and the chassis longitudinal beam 1 is commensurate with the load-bearing box 2. A fixed connecting plate 21 is fixedly connected to the bearing box 2 and to the chassis longitudinal beam 1. The fixed connecting plate 21 and the side wall of the bearing box 2 are configured as an integral structure. Specifically, the portion of the side wall of the bearing box 2 extending downward beyond the bottom of the bearing box 2 forms the fixed connecting plate 21. The fixed connecting plate 21 is attached to the side of the chassis longitudinal beam 1 and fixedly connected to the side wall of the chassis longitudinal beam 1. The connection method between the fixed connecting plate 21 and the chassis longitudinal beam 1 is one or a combination of bolt connection, riveting, or welding. Preferably, the fixed connecting plate 21 and the chassis longitudinal beam 1 are fixedly connected by riveting. The load-bearing box 2 is fixedly connected to the side of the chassis longitudinal beam 1 by the fixed connecting plate 21, so as not to damage the upper and lower planes of the chassis longitudinal beam 1 and ensure that the bending strength of the chassis longitudinal beam 1 is not reduced; and the fixed connecting plate 21 is rigidly connected to the chassis longitudinal beam 1. The fixed connecting plate 21 is a whole plate, and its fixed connection with the chassis longitudinal beam 1 strengthens the chassis longitudinal beam 1 and improves the overall strength of the chassis longitudinal beam 1.

[0044] The transverse support beam 4 spans the chassis longitudinal beam 1 and is fixedly connected to the chassis longitudinal beam 1. The transverse support beam 4 includes a transverse support plate 42 and first flanges 41 fixedly connected to both ends of the transverse support plate 42. The first flanges 41 are arranged perpendicular to the transverse support plate 42. The first flanges 41 serve as reinforcing ribs for the transverse support plate 42, thereby improving the bending resistance of the transverse support plate 42 and increasing the load-bearing capacity of the transverse support beam 4.

[0045] The upper ends of the carrying box 2 and the transverse support beam 4 are covered by a cover plate 3, the bottom surface of which is fixedly connected to the top of the carrying box 2. The cover plate 3 has a rectangular structure, with vertically folded second edges 31 at the front and rear ends. Vertically folded third edges 32 are provided on both sides of the cover plate 3. The second edges 31 and third edges 32 are fixedly connected and folded together around the cover plate 3 to form a closed structure. The cover plate 3 is fixedly connected to the transverse support beam 4 via the second edges 31. The second edges 31 and third edges 32, together with the cover plate 3, form a box-like structure, enhancing the bending resistance and load-bearing capacity of the cover plate 3. A flat surface is formed above the cover plate 3, serving as an installation surface for mounting the upper body of the RV.

[0046] This invention utilizes a transverse support beam 4 and a load-bearing box 2 spanning across the chassis longitudinal beam 1. A cover plate 3 is fixed to the upper end of the transverse support beam 4 and the load-bearing box 2, forming a box beam structure with the chassis longitudinal beam 1. This structure provides excellent bending and torsional resistance, ensuring overall structural stability. Increasing the height of the box beam structure further enhances its bending and torsional resistance. It also increases the height of the added section on the chassis longitudinal beam, addressing the problem in existing subframe structures that use support columns for point support. The higher the section is added, the lower its torsional and bending resistance becomes, leading to structural instability and limiting the height of the superstructure's bottom mounting surface. Existing frame structures typically only increase height by 200mm, while this invention allows for a height increase of up to 400mm. Furthermore, the combination of the box body and plate structure facilitates spatial arrangement and reduces structural weight.

[0047] As a preferred embodiment, an auxiliary support box 5 is provided below the cover plate 3. The auxiliary support box 5 is located between the transverse support beam 4 and the load-bearing box 2 and is used to provide auxiliary support for the cover plate 3. The auxiliary support box 5 is fixed to the chassis longitudinal beam 1. The auxiliary support box 5 can be directly fixed with bolts or indirectly fixed to the chassis longitudinal beam 1 with angle steel. The auxiliary support box 5 is used to support the cover plate 3, thereby preventing the middle of the cover plate 3 from sinking downward. The auxiliary support box 5 can be the tank body structure of the water tank, or a frame or plate can be used instead of the auxiliary support box 5 for auxiliary support.

[0048] As a preferred embodiment, a certain distance is provided between the auxiliary support box 5 and the carrier box 2. The distance can prevent the auxiliary support box 5 from making hard contact with the carrier box 2. When subjected to the inertial force in the forward or backward direction of the vehicle, the distance can avoid deformation displacement.

[0049] In one embodiment, such as Figure 5As shown: The fixed connecting plate 21 can be a separate part fixedly connected to the side of the bearing box 2. The fixed connecting plate 21 is fixedly connected to the outer side wall of the chassis longitudinal beam 1, thereby fixing the bearing box 2 above the chassis longitudinal beam.

[0050] In another embodiment, such as Figure 6 As shown: The fixed connecting plate 21 can also be fixedly connected to the bottom of the bearing box 2, and the fixed connecting plate 21 is fixedly connected to the inner side wall of the longitudinal beam 1 of the base frame.

[0051] In some embodiments, the transverse support beam 4 can be replaced by a rectangular box structure or a frame structure welded from square steel.

[0052] In some embodiments, such as Figure 7 As shown, a first partition 22 is provided in the middle of the carrier box 2. One side chamber of the first partition 22 is used as a water tank to store water, and the other side chamber of the first partition 22 stores the battery 23. The heavier water tank and battery 23 in the RV structure are placed in the carrier box 2, so that the weight is located on the chassis longitudinal beams at the wheel area, which is conducive to the balance of forces and makes the RV more stable and safe to drive.

[0053] As a preferred embodiment, the auxiliary support box 5 is configured as a clean water tank for storing clean water. A second partition 51 is installed inside the auxiliary support box 5 to prevent water surges from damaging the box body while improving its supporting capacity. A heating pipe 52 is installed inside the auxiliary support box 5 to heat the water inside. Configuring the auxiliary support box 5 as a clean water tank saves space and concentrates the heavier load on the vehicle's central axis, maintaining the longitudinal beams' gravity balance and lowering the center of gravity. The auxiliary support box 5's location on the vehicle's central axis facilitates weight balance, eliminating the need for additional counterweights and improving structural layout, resulting in greater vehicle stability. The heated hot water stored in the auxiliary support box 5 provides domestic hot water for the RV. Simultaneously, the auxiliary support box 5, located at the bottom of the cover plate 3, provides underfloor heating to the upper compartment above the cover plate 3, thus supporting the cover plate 3 while providing underfloor heating to the interior space of the RV.

[0054] The heating pipe 52 adopts a water heating pipe structure and is connected to the engine's cooling water. The engine cooling water circulates through the heating pipe 52 to heat the water in the auxiliary support box 5. Alternatively, the heating pipe 52 adopts an electric heating pipe structure and is electrically connected to a solar storage battery. The heating pipe 52 uses the electrical energy stored in solar power for heating. By guiding the engine's cooling water to the heating pipe 52 to heat the auxiliary support box 5, the heat energy that the engine needs to dissipate is recovered and utilized, improving energy efficiency. Alternatively, solar energy can be used to provide energy, which is energy-saving and environmentally friendly.

[0055] In one embodiment, such as Figure 8 As shown, a transverse support beam 4 is provided at the tail end of the chassis longitudinal beam 1. The transverse support beam 4 at the tail end of the chassis longitudinal beam 1 is flush with the tail end of the chassis longitudinal beam 1. The tail end of the cover plate 3 extends to the transverse support beam 4 at the tail end of the chassis longitudinal beam 1. A storage cavity 7 is formed between the transverse support beam 4 at the tail end of the chassis longitudinal beam 1 and the carrying box 2. The storage cavity 7 is used to store items. The tail end of the cover plate 3 extends to the transverse support beam 4 at the tail end of the chassis longitudinal beam 1, thereby maximizing the installation plane of the upper cover plate 3.

[0056] In another embodiment, such as Figure 9 As shown, to facilitate the rear layout of the RV, the rear of the chassis longitudinal beam 1 is designed with a sunken structure. The rear end of the chassis longitudinal beam 1 is cut and fixedly connected to a downwardly extending vertical connecting beam 11. The lower end of the vertical connecting beam 11 is fixedly connected to a horizontal settlement beam 12. An L-shaped panel 13 covers the horizontal settlement beam 12 and the vertical connecting beam 11, and the upper end of the L-shaped panel 13 is fixedly connected to a cover plate 3. Therefore, by setting a sunken structure at the rear of the chassis longitudinal beam 1, the utilization of the rear space of the RV can be facilitated, increasing the vertical arrangement space at the rear of the RV.

[0057] In another embodiment, such as Figure 10 As shown, the bottom of the rear of the RV is set as a storage space, and the rear of the chassis longitudinal beam 1 is set as an upward lifting structure. After the rear end of the chassis longitudinal beam 1 is cut, it is fixedly connected to the upwardly extending vertical connecting beam 11. The upper end of the vertical connecting beam 11 is fixedly connected to the horizontal lifting beam 14. The horizontal lifting beam 14 and the vertical connecting beam 11 are covered with a bent patch 15. The lower end of the bent patch 15 is fixedly connected to the cover plate 3.

[0058] In one embodiment, such as Figure 11As shown, a mudguard 6 is fixedly connected to the side of the carrying box 2 near the wheel. The mudguard 6 is located on the front and rear sides of the wheel. A support plate 61 is fixedly connected to the lower end of the mudguard 6. A vertical plate 62 is fixedly connected to the end of the support plate 61 away from the mudguard 6. The vertical plate 62 is fixedly connected to the chassis longitudinal beam 1. Specifically, the upper end of the mudguard 6 can be fixedly connected to the bottom of the cover plate 3. The mudguard 6, support plate 61, and cover plate 3 enclose a storage space for easy placement of items. At the same time, the mudguard 6 supports the portion of the cover plate 3 extending to the outer side of the chassis longitudinal beam 1, improving the load-bearing capacity of the cover plate 3. Furthermore, the mudguard 6 can shield the mud ejected by the wheel, preventing debris from the wheel from being thrown into the storage space.

[0059] This invention provides a subframe structure for a modified vehicle. During use, the weight of the RV's superstructure is transferred to the cover plate 3, which in turn transfers it to the structurally strong load-bearing box 2. The load-bearing box 2 then transfers the weight of the superstructure to the chassis longitudinal beams 1. Furthermore, the transverse support beams 4 and auxiliary support boxes 5 provide auxiliary support for transferring the vertical weight. During braking or starting, a significant horizontal force is generated between the superstructure and the chassis longitudinal beams 1. The superstructure transfers this horizontal force to the cover plate 3, which in turn transfers it to the load-bearing box 2, which is fixedly connected to the cover plate 3. From there, the force is transferred to the chassis longitudinal beams 1, completing the force transfer process. Both the vertical weight and horizontal force generated by the RV's superstructure are primarily transferred through the load-bearing box 2. The load-bearing box 2, transverse support beams 4, cover plate 3, and chassis longitudinal beams 1 form a box-like structural support, ensuring structural stability.

[0060] This invention provides a subframe structure for a modified vehicle. A fixed connecting plate 21 rivets the load-bearing box 2 to the chassis longitudinal beam 1. The cover plate 3 connected to the load-bearing box 2 is connected to the transverse support beam 4 and placed on the longitudinal beam to form an integral box beam structure. Using the load-bearing box 2 as a structural connector of the subframe enhances the strength of the chassis longitudinal beam 1, improves torsional resistance, simplifies the structural design, saves materials, reduces weight, and lowers cost. The load-bearing capacity of the upper body box on the cover plate 3 is directly transferred to the chassis longitudinal beam 1, solving the problems of high cost and heavy weight caused by the complex frame structures in existing technologies. Simultaneously, it improves space utilization, facilitates mass production, and increases production efficiency. By positioning the load-bearing box 2 above the wheel axle and the auxiliary support box 5 on the vehicle's centerline, the strength of the chassis longitudinal beam 1 is enhanced, and a low center of gravity design is perfectly achieved, making the RV more stable and safer to drive. The cover plate 3 is folded around its perimeter to form a box-shaped structure, and the transverse support beam 4, the load-bearing box 2, and the auxiliary support box 5 are fixedly connected to the longitudinal beam to form a box-beam box body. This solves the problem of various loads generated during sudden stops and accelerations during driving being transferred to the chassis longitudinal beam 1 through the connected load-bearing box 2, which helps extend the service life of the longitudinal beam and makes the overall structure of the RV body and frame stable. The modified vehicle subframe structure provided by this invention adopts a box beam and cover plate 3 sheet material structure, without a complex skeleton, which facilitates wiring harness routing, makes space utilization without interference, has a simple structure, low cost, simplifies the installation process, and is easy to manufacture. At the same time, the auxiliary support box 5 can be used as a water tank to heat and store heat energy, and use heat conduction to provide heating for the cover plate 3 and the upper body of the vehicle, which is energy-saving and environmentally friendly.

[0061] Those skilled in the art will understand that, as needed, a storage space for placing items such as tools can be provided on the side of the subframe of the present invention. In the storage space configuration, connecting rods can be fixed to the side wall of the chassis longitudinal beams to support the storage space housing, depending on strength requirements.

[0062] The subframe structure for modified vehicles provided by this invention can be used in non-load-bearing motorhomes, where the subframe is mounted on the main beam of the non-load-bearing motorhome. Based on the principles of this invention, it can also be applied to load-bearing motorhomes, where the subframe is mounted on the main beam of the load-bearing motorhome. According to the structure of this invention, it can also be applied to modifying other modified vehicles with chassis beams by raising the floor of the passenger compartment.

[0063] The parts not covered in this technical solution can be implemented using existing technologies.

[0064] The foregoing has shown and described the basic principles, main features, and characteristics of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A subframe structure for a modified vehicle, characterized in that: The vehicle includes a subframe mounted above the chassis longitudinal beam (1). The subframe includes a load-bearing box (2), a cover plate (3), and a transverse support beam (4). The load-bearing box (2) spans the chassis longitudinal beam (1) and is fixedly connected to the chassis longitudinal beam (1). The transverse support beam (4) spans the chassis longitudinal beam (1) and is fixedly connected to the chassis longitudinal beam (1). The upper end of the load-bearing box (2) and the transverse support beam (4) is fixedly connected to the cover plate (3). The upper part of the cover plate (3) serves as an installation plane for installing the upper body of the motorhome. The load-bearing box is fixedly connected to the chassis longitudinal beam, and the cover plate connected to the load-bearing box is connected to the transverse support beam and placed on the longitudinal beam to form an integral box beam structure. The load-bearing box is used as a structural connector of the subframe, which enhances the strength of the chassis longitudinal beam and directly transfers the load-bearing capacity of the upper body box on the cover plate to the chassis longitudinal beam. The transverse support beam (4) includes a transverse support plate (42) and a first flange (41) fixedly connected to both ends of the transverse support plate (42). The first flange (41) is arranged perpendicularly to the transverse support plate (42). The front and rear ends of the cover plate (3) are provided with a second flange (31) arranged vertically. The sides of the cover plate (3) are provided with a third flange (32) arranged vertically. The second flange (31) and the third flange (32) are combined around the cover plate (3) to form a closed structure. An auxiliary support box (5) is provided below the cover plate (3). The auxiliary support box (5) is located between the transverse support beam (4) and the bearing box (2) and is used to support the cover plate (3). When braking or starting, the upper body of the vehicle transfers the horizontal force to the cover plate, and the horizontal force on the cover plate is transferred to the carrier box that is fixedly connected to the cover plate, and then to the chassis longitudinal beam through the carrier box.

2. The modified vehicle subframe structure according to claim 1, characterized in that: The carrier box (2) is fixedly connected to a fixed connecting plate (21), which is attached to the side of the chassis longitudinal beam (1) and fixedly connected to the chassis longitudinal beam (1).

3. The modified vehicle subframe structure according to claim 1, characterized in that: The bottom surface of the carrier box (2) is placed on the upper surface of the chassis longitudinal beam (1), and the carrier box (2) is located above the wheel axle of the RV.

4. The modified vehicle subframe structure according to claim 1, characterized in that: The carrier box (2) has a first partition (22) in the middle. One side chamber of the first partition (22) serves as a water tank for storing water, and the other side chamber stores a battery (23).

5. The modified vehicle subframe structure according to claim 1, characterized in that: The auxiliary support box (5) is set as a clean water tank for storing clean water, and a second partition (51) is provided inside the auxiliary support box (5); a heating pipe (52) is provided inside the auxiliary support box (5), and the heating pipe (52) heats the water in the auxiliary support box (5). The hot water heated in the auxiliary support box (5) provides a hot water source for the RV and provides floor heating for the bottom of the upper vehicle compartment.

6. The modified vehicle subframe structure according to claim 5, characterized in that: The heating pipe (52) is connected to the engine's cooling water, and the engine cooling water circulates through the heating pipe (52) to heat the water in the auxiliary support box (5); or the heating pipe (52) is heated by the electrical energy stored by solar power generation.

7. The modified vehicle subframe structure according to claim 1, characterized in that: A mudguard (6) is fixedly connected to the side of the bearing box (2) near the wheel. The mudguard (6) is located on the front and rear sides of the wheel. A support plate (61) is fixedly connected to the lower end of the mudguard (6). A vertical plate (62) is fixedly connected to the end of the support plate (61) away from the mudguard (6). The vertical plate (62) is fixedly connected to the chassis longitudinal beam (1).

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