Commercial vehicle body in white

Abstract

The invention belongs to the technical field of vehicle manufacturing, and discloses a commercial vehicle body in white. The top cover comprises a top cover, a left side wall and a right side wall, the left side wall and the right side wall are installed on the lower side of the top cover, top plates are installed on the two symmetrical sides of the top cover, the top plates on the two sides are bent towards the inner side of a vehicle to form first turned edges, the left side wall comprises a left outer plate, the upper side of the left outer plate is sunken towards the inner side of the vehicle to form a first installation table, and the first turned edges are placed on the first installation table; the right side wall comprises a right outer plate, the upper side of the right outer plate sinks towards the interior of the vehicle to form a second mounting table, and the first flange is placed on the second mounting table; the problem that in the prior art, in the commercial vehicle body-in-white machining process, a shielding piece needs to be additionally arranged for shielding a weld joint is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle manufacturing, and particularly to a commercial vehicle body-in-white. Background Art

[0002] As an important link in the modern industrial system, the manufacturing process of commercial vehicle bodies is directly related to the overall vehicle quality and market competitiveness. In the increasingly competitive global market environment, commercial vehicle manufacturers not only need to ensure the structural safety and functional reliability of products, but also need to achieve an effective balance between improving appearance quality and optimizing production costs. In the currently widely used manufacturing processes, the body-in-white, as the basic carrier of the vehicle skeleton, its processing quality and assembly accuracy have a decisive impact on the subsequent general assembly process and the final product performance.

[0003] The structure of traditional commercial vehicle bodies-in-white usually consists of six core components: a roof assembly, a left side panel assembly, a right side panel assembly, a front panel assembly, a rear panel assembly, and a floor assembly. The components are structurally connected through welding processes. Although this classic body construction method has been followed in the industry for many years, many technical limitations have gradually emerged in the actual production process. Especially in the treatment of welding seams, since the welds formed in the overlapping areas of the components are directly exposed on the outer surface of the body, it not only destroys the overall coordination of the body appearance, but also has an adverse impact on the subsequent painting process and the final product image. To make up for this process defect, the current common practice is to additionally install shielding parts in the exterior design stage, and hide the weld marks through the covering effect of additional decorative parts. However, this passive repair solution is essentially a compromising treatment of the process defect. Although this shielding part installation process meets the basic requirements of appearance beautification to a certain extent, it brings multiple negative impacts from the perspective of the whole life cycle cost. First, the mold development and production manufacturing of the shielding parts require additional R & D funds and equipment resources, directly increasing the material cost of a single vehicle. Second, the assembly process of the shielding parts increases the station settings on the production line, leading to the complication of the process flow and indirectly affecting the overall production efficiency. More importantly, the weight accumulation effect of the additional parts may make it difficult to achieve the goal of vehicle lightweight design, which potentially conflicts with the current industry trend of energy conservation and emission reduction. This technical route that treats the symptoms rather than the root cause essentially reflects the lack of systematic design thinking and integrated innovation in traditional processes.

[0004] Another key factor restricting production efficiency lies in the complexity of the existing connection process. To achieve reliable connection of each body component, the current process generally uses an intermediate connecting plate as a transition structural member to connect different assembly parts. This technical solution requires precise positioning and multiple welding fixings of each connecting plate, which not only significantly increases the number of welding operations but also poses higher requirements for the precision control of production equipment. In the scenario of large-scale production, each additional welding process means a corresponding extension of the production cycle, and at the same time, it will bring multiple cost superposition effects such as energy consumption, equipment wear, and quality risks. During the connection of the existing roof cover with other components, the longitudinal beam on the roof cover is connected to the cross beam on the corresponding component. However, only a small area at the cross-section of the longitudinal beam is used to connect to the cross beam, which also causes the welding torch to be unable to reach in, the welding area is too small, and the area after welding cannot meet the strength requirements designed. Therefore, in order to facilitate processing and meet the design requirements, a welding connecting plate needs to be introduced between the roof cover and other components so that the structural members can...

[0005] From the perspective of industrial upgrading, these technical bottlenecks existing in the traditional process have severely restricted the sustainable development ability of enterprises. With the continuous improvement of consumers' requirements for vehicle appearance quality and the white-hot market competition, simply relying on later remedial measures has been difficult to meet the market demand. The problem of the exposure of body welds not only affects the visual expression of the product but may also be interpreted by end-users as a quality defect of rough manufacturing process, which poses a potential threat to the shaping of the brand image. At the same time, the redundant trend of welding processes has led to high production costs, directly weakening the initiative of enterprises in price competition.

[0006] Today, with the concepts of intelligent manufacturing and lean production deeply rooted in people's hearts, the traditional process model has been difficult to meet the needs of modern production. Welding operations on different components not only cause waste of working hours, but their cumulative error effect may also affect the body assembly accuracy. Such systematic defects often need to be corrected through repeated debugging in the later stage, forming a vicious cycle. In addition, excessive use of connecting transition parts has led to an increase in the redundancy of the body structure, which runs counter to the industry trend of automotive lightweight design. This technical lag at the process level has become an important obstacle restricting the high-quality development of commercial vehicle manufacturing enterprises. Summary of the Invention

[0007] The purpose of the present invention is to provide a commercial vehicle body-in-white, which solves the problem that in the processing of the commercial vehicle body-in-white in the prior art, it is necessary to add shielding parts to cover the welds.

[0008] To achieve this purpose, the present invention adopts the following technical solutions: The present invention provides a commercial vehicle body-in-white, including a roof panel, a left side panel, and a right side panel. The left side panel and the right side panel are installed on the lower side of the roof panel. On both symmetric sides of the roof panel, there are roof plates installed. On both sides, the roof plates are bent towards the interior of the vehicle to form a first flanging. The left side panel includes a left outer panel. On the upper side of the left outer panel, it is recessed towards the interior of the vehicle to form a first mounting platform. The first flanging is placed on the first mounting platform. The right side panel includes a right outer panel. On the upper side of the right outer panel, it is recessed towards the interior of the vehicle to form a second mounting platform. The first flanging is placed on the second mounting platform.

[0009] Preferably, on the upper side of the first mounting platform of the left outer panel, a first fixing plate extends out. On the interior side of the first fixing plate, a left outer beam is installed. On the side close to the interior of the vehicle of the left outer beam, a left inner beam is installed. The left outer beam and the left inner beam bulge to enclose a cavity.

[0010] Preferably, on the upper side of the second mounting platform of the right outer panel, a second fixing plate extends out. On the interior side of the second fixing plate, a right outer beam is installed. On the side close to the interior of the vehicle of the right outer beam, a right inner beam is installed. The right outer beam and the right inner beam bulge to enclose a cavity.

[0011] Preferably, the commercial vehicle body-in-white further includes a rear panel, which includes a rear outer panel, a rear inner cross beam, and a rear outer cross beam. On the upper side of the rear outer panel, it is bent towards the exterior of the vehicle to form a second flanging. On the second flanging, a rear outer cross beam is installed. The lower end of the rear outer cross beam is connected to the rear outer panel. On the interior side of the rear outer cross beam, a rear inner cross beam is also installed.

[0012] Preferably, at the end of the rear inner cross beam close to the interior of the vehicle, it is bent to form a third flanging. At the rear side of the roof panel, a top cross beam is installed. The cross-section of the top cross beam is in a shape of a capital "J". One side of the top cross beam is connected to the third flanging, and the other side is connected to the second flanging. The top cross beam, the rear inner cross beam, and the rear outer cross beam enclose a cavity.

[0013] Preferably, the commercial vehicle body-in-white further includes a first connecting plate. On the upper side of the first connecting plate, a first connecting piece is connected. The first connecting piece is connected to the top cross beam. The main body of the first connecting plate is in an "L" shape. One side of the first connecting plate is connected to the rear inner cross beam, and the other side is connected to the left inner beam.

[0014] Preferably, the commercial vehicle body-in-white further includes a second connecting plate. The second connecting plate is installed on the side of the first connecting plate close to the exterior of the vehicle. One side of the second connecting plate is connected to the left side panel, and the other side is connected to the rear panel.

[0015] Preferably, the commercial vehicle body-in-white further includes a third connecting plate. A second connecting piece is connected to the upper side of the third connecting plate. The second connecting piece is connected to the top cross beam. The main body of the third connecting plate is L-shaped. One side of the third connecting plate is connected to the rear inner cross beam, and the other side is connected to the right inner beam.

[0016] Preferably, the commercial vehicle body-in-white further includes a fourth connecting plate. The fourth connecting plate is installed on the side of the third connecting plate close to the outside of the vehicle. One side of the fourth connecting plate is connected to the right side panel, and the other side is connected to the rear panel.

[0017] Preferably, the commercial vehicle body-in-white further includes a front panel and a floor. The four sides of the floor are respectively welded to the front panel, the left side panel, the right side panel and the rear panel. The lower side of the roof cover is respectively welded to the front panel, the left side panel, the right side panel and the rear panel. A middle plate is arranged on the upper side of the roof cover. Along the vehicle driving direction, a front plate and a rear plate are respectively installed on both sides of the middle plate. The front plate is connected to the front panel. Roof plates are installed on both sides of the middle plate. A longitudinal beam is welded on the rear plate, and the lower end of the longitudinal beam is connected to the top cross beam.

[0018] Beneficial effects: The left outer plate and the right outer plate are simultaneously recessed into the commercial vehicle interior to form a first installation platform and a second installation platform. When the roof plate on the corresponding roof cover is bent inwardly, when the roof plate is welded to the left side panel and the right side panel, welding needs to be carried out from the interior side of the vehicle. The weld seam is clamped between the first flanging and the first installation platform, and the weld seam on the other side will also be clamped between the second flanging and the second installation platform. The weld seam is entirely located inside the vehicle, making the vehicle more aesthetically pleasing after welding, eliminating the need to install decorative plates and reducing production costs. Description of the Drawings

[0019] Figure 1 is the main body diagram of the commercial vehicle body-in-white of the present invention;

[0020] Figure 2 is the main body diagram of the roof cover of the present invention;

[0021] Figure 3 is the exploded view of the left side panel of the present invention;

[0022] Figure 4 is the exploded view of the right side panel of the present invention;

[0023] Figure 5 is the exploded view of the rear panel of the present invention;

[0024] Figure 6 is the cross-sectional installation diagram of the left inner beam of the present invention;

[0025] Figure 7 is the cross-sectional installation diagram of the right inner beam of the present invention;

[0026] Figure 8It is a schematic diagram of the connection between the top crossbeam and the rear enclosure of the present invention;

[0027] Figure 9 It is a schematic diagram of the connection between the left enclosure, the rear enclosure and the main body of the right enclosure of the present invention;

[0028] Figure 10 It is an installation diagram of the first connecting plate of the present invention;

[0029] Figure 11 It is an installation diagram of the third connecting plate of the present invention;

[0030] Figure 12 It is an exploded view of the commercial vehicle body-in-white of the present invention.

[0031] In the figure: 1. Roof cover; 11. Top plate; 111. First flanging; 12. Top crossbeam; 13. Middle plate; 14. Front plate; 15. Rear plate; 16. Longitudinal beam; 2. Left enclosure; 21. Left outer panel; 211. First installation platform; 212. Second connecting plate; 22. First fixing plate; 23. Left outer beam; 24. Left inner beam; 3. Right enclosure; 31. Right outer panel; 311. Second installation platform; 312. Fourth connecting plate; 32. Second fixing plate; 33. Right outer beam; 34. Right inner beam; 4. Floor; 5. Rear enclosure; 51. Rear outer panel; 511. Second flanging; 52. Rear inner crossbeam; 521. Third flanging; 53. Rear outer crossbeam; 6. Front enclosure; 7. First connecting plate; 71. First connecting piece; 8. Third connecting plate; 81. Second connecting piece. Detailed implementation manners

[0032] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0033] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0035] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] Under the prior art, the processing of commercial vehicles needs to be carried out around the body-in-white. The body-in-white of commercial vehicles includes several parts, which are divided into a roof panel, a left side panel, a right side panel, a front panel, a rear panel and a floor. Each part is connected together by welding. During the processing under the prior art, weld seams will be formed at the contact positions of each position of the roof panel, the left side panel, the right side panel, the front panel and the floor. The weld seams are located outside the vehicle. For the beauty of the vehicle body, it is necessary to install a shielding part on the outside of the body-in-white to shield the weld seams, so as to avoid the exposure of the weld seams on the outside and make the finally processed vehicle body more beautiful. However, adding the shielding part will increase the manufacturing cost of commercial vehicles. At the same time, during the processing of existing commercial vehicles, the roof panel, the left side panel, the right side panel, the front panel and the floor need to be connected to each other through additional connecting plates. During the connection between the roof panel and the rear panel, the longitudinal beam on the roof panel needs to be transitionally welded to the cross beam on the rear panel through a connecting plate, so that the welding area is larger to maintain the strength after welding. However, this will increase the welding process, resulting in a longer welding process and also increasing the welding cost.

[0037] To solve the above problems, as Figures 1 to 12As shown in the figure, the present invention provides a commercial vehicle body-in-white, which includes a roof panel 1, a left side panel 2, and a right side panel 3. The left side panel 2 and the right side panel 3 are installed on the lower side of the roof panel 1. On both symmetric sides of the roof panel 1, there are installed roof plates 11. On both sides of the roof plates 11, a first flanging 111 is formed by bending towards the interior of the vehicle. The left side panel 2 includes a left outer panel 21. On the upper side of the left outer panel 21, a first mounting platform 211 is recessed towards the interior of the vehicle. The first flanging 111 is placed on the first mounting platform 211. The right side panel 3 includes a right outer panel 31. On the upper side of the right outer panel 31, a second mounting platform 311 is recessed towards the interior of the vehicle. The first flanging 111 is placed on the second mounting platform 311.

[0038] By providing a first mounting platform 211 on the left outer panel 21 and a second mounting platform 311 on the right outer panel 31, and placing the first flangings 111 on both sides of the roof plate 11 on the first mounting platform 211 and the second mounting platform 311 for welding. Since the first flangings 111 are bent towards the interior of the vehicle, the position of the weld can be moved to the interior of the vehicle. The weld exists in the gaps between the first flanging 111 and the first mounting platform 211, and between the first flanging 111 and the second mounting platform 311, so that the weld is not directly exposed outside the vehicle, saving the decorative panel and reducing the production cost of the vehicle. During the welding process, the position of the welding torch is inside the vehicle, making the finally formed weld located on the interior side of the vehicle, avoiding the weld being exposed on the outside.

[0039] On the upper side of the first mounting platform 211 of the left outer panel 21, a first fixing plate 22 extends out. On the interior side of the first fixing plate 22, a left outer beam 23 is installed. On the side close to the interior of the vehicle of the left outer beam 23, a left inner beam 24 is installed. The left outer beam 23 and the left inner beam 24 bulge to enclose a cavity.

[0040] The space where the first fixing plate 22 is located is the interior of the vehicle. The left outer beam 23 and the left inner beam 24 are successively attached to the first fixing plate 22. By welding the left outer beam 23 and the left inner beam 24 to the first fixing plate 22 inside the vehicle, the weld can be left inside the vehicle, reducing the number of cover plates used. At the same time, the left outer beam 23 and the left inner beam 24 are welded inside the vehicle by welding, so that the weld can be left inside the vehicle. The left outer beam 23 and the left inner beam 24 bulge to enclose a cavity and are fixed by welding, which can provide a certain structural strength for the commercial vehicle body-in-white.

[0041] On the upper side of the second mounting platform 311 of the right outer panel 31, a second fixing plate 32 extends out. On the interior side of the second fixing plate 32, a right outer beam 33 is installed. On the side close to the interior of the vehicle of the right outer beam 33, a right inner beam 34 is installed. The right outer beam 33 and the right inner beam 34 bulge to enclose a cavity.

[0042] The space where the second fixing plate 32 is located is inside the vehicle. The right outer beam 33 and the right inner beam 34 are successively attached to the second fixing plate 32. The right outer beam 33 and the right inner beam 34 are welded to the second fixing plate 32 inside the vehicle, so that the weld seams can remain inside the vehicle, reducing the number of cover plates used. At the same time, the right outer beam 33 and the right inner beam 34 are welded inside the vehicle in a welding form, so that the weld seams can remain inside the vehicle. The right outer beam 33 and the right inner beam 34 bulge to enclose a cavity and are fixed by welding, which can provide a certain structural strength for the commercial vehicle body-in-white.

[0043] The commercial vehicle body-in-white further includes a rear panel 5. The rear panel 5 includes a rear outer panel 51, a rear inner cross beam 52, and a rear outer cross beam 53. The rear outer panel 51 is bent laterally outward to form a second flanging 511. The rear outer cross beam 53 is installed on the second flanging 511. The lower end of the rear outer cross beam 53 is connected to the rear outer panel 51. The rear inner cross beam 52 is also installed on the inner side of the vehicle of the rear outer cross beam 53.

[0044] The rear inner cross beam 52 is bent at the end close to the inside of the vehicle to form a third flanging 521. A top cross beam 12 is installed at the rear side of the roof panel 1. The cross section of the top cross beam 12 is in a shape of a capital "J". One side of the top cross beam 12 is connected to the third flanging 521, and the other side is connected to the second flanging 511. The top cross beam 12, the rear inner cross beam 52, and the rear outer cross beam 53 enclose a cavity.

[0045] By improving the connection structure between the top cross beam 12 and the rear panel 5, the present invention integrates the top cross beam 12 under the roof panel 1. The top cross beam 12 is connected to the rear panel 5, the left side panel 2, and the right side panel 3. The welding connecting plate between the original top cross beam 12 and the rear panel 5 is cancelled. A top cross beam 12 in a shape of a capital "J" is installed at the rear side of the roof panel 1. The two sides of the top cross beam 12 in the width direction are respectively connected to a first connecting piece 71 and a second connecting piece 81, which can increase the contact area between the top cross beam 12 and the rear panel 5 and increase the contact strength between the rear panel 5 and the top cross beam 12. At the same time, since the top cross beam 12 is installed at the bottom of the roof panel 1 and the cross section of the top cross beam 12 is changed to a shape of a capital "J", the rear panel 5 is in full contact with the capital "J" shape of the top cross beam 12 through structural improvement, increasing the contact area with the rear panel 5. The top cross beam 12 can be connected to the roof panel 1 in advance, replacing the original welding connecting plate, and reducing the production cost of the body-in-white.

[0046] The commercial vehicle body-in-white further includes a first connecting plate 7. A first connecting piece 71 is connected to the upper side of the first connecting plate 7. The first connecting piece 71 is connected to the top cross beam 12. The main body of the first connecting plate 7 is in an L shape. One side of the first connecting plate 7 is connected to the rear inner cross beam 52, and the other side is connected to the left inner beam 24.

[0047] The first connecting plate 7 of the present invention can connect the rear panel 5, the left side panel 2, and the roof panel 1 at the same time, connect and fix the above three, and improve the overall structural strength of the commercial vehicle body-in-white.

[0048] The commercial vehicle body-in-white further includes a second connecting plate 212. The second connecting plate 212 is installed on the side of the first connecting plate 7 close to the outside of the vehicle. One side of the second connecting plate 212 is connected to the left side panel 2, and the other side is connected to the rear panel 5. The second connecting plate 212 is also L-shaped, and the second connecting plate 212 is parallel to the first connecting plate 7. The second connecting plate 212 can also fix the rear panel 5 and the left side panel 2 to achieve connection and improve the overall structural strength of the commercial vehicle body-in-white.

[0049] The commercial vehicle body-in-white further includes a third connecting plate 8. A second connecting piece 81 is connected to the upper side of the third connecting plate 8, and the second connecting piece 81 is connected to the top cross beam 12. The main body of the third connecting plate 8 is L-shaped. One side of the third connecting plate 8 is connected to the rear inner cross beam 52, and the other side is connected to the right inner beam 34.

[0050] The third connecting plate 8 of the present invention can simultaneously connect the rear panel 5, the right side panel 3, and the roof panel 1, connect and fix the above three, and improve the overall structural strength of the commercial vehicle body-in-white.

[0051] The commercial vehicle body-in-white further includes a fourth connecting plate 312. The fourth connecting plate 312 is installed on the side of the third connecting plate 8 close to the outside of the vehicle. One side of the fourth connecting plate 312 is connected to the right side panel 3, and the other side is connected to the rear panel 5. The fourth connecting plate 312 is also L-shaped, and the fourth connecting plate 312 is parallel to the third connecting plate 8. The fourth connecting plate 312 can also fix the rear panel 5 and the right side panel 3 to achieve connection and improve the overall structural strength of the commercial vehicle body-in-white.

[0052] The commercial vehicle body-in-white further includes a front panel 6 and a floor 4. The four sides of the floor 4 are respectively welded to the front panel 6, the left side panel 2, the right side panel 3, and the rear panel 5, and finally the commercial vehicle body-in-white in a rectangular state is spliced.

[0053] The front panel 6, the left side panel 2, the right side panel 3, and the rear panel 5 are respectively welded to the lower side of the roof panel 1. A middle plate 13 is provided on the upper side of the roof panel 1. Along the vehicle driving direction, a front plate 14 and a rear plate 15 are respectively installed on both sides of the middle plate 13. The front plate 14 is connected to the front panel 6. Roof plates 11 are installed on both sides of the middle plate 13. A longitudinal beam 16 is welded to the rear plate 15, and the lower end of the longitudinal beam 16 is connected to the top cross beam 12. The inside of the roof panel 1 is reinforced through the longitudinal beam 16, so that the roof panel 1 can meet the design requirements.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A commercial vehicle body in white, characterized in that: The vehicle comprises a top cover (1), a left side panel (2) and a right side panel (3), wherein the left side panel (2) and the right side panel (3) are mounted on the lower side of the top cover (1), top panels (11) are mounted on two symmetrical sides of the top cover (1), the top panels (11) on both sides are bent toward the vehicle interior to form a first flange (111), the left side panel (2) comprises a left outer panel (21), the upper side of the left outer panel (21) is recessed toward the vehicle interior to form a first mounting platform (211), the first flange (111) is placed on the first mounting platform (211), the right side panel (3) comprises a right outer panel (31), the upper side of the right outer panel (31) is recessed toward the vehicle interior to form a second mounting platform (311), the first flange (111) is placed on the second mounting platform (311).

2. The commercial vehicle body-in-white according to claim 1, characterized in that: The left outer plate (21) extends out of a first fixing plate (22) on the upper side of the first mounting platform (211); the first fixing plate (22) is installed with a left outer beam (23) on the side inside the vehicle; the left outer beam (23) is installed with a left inner beam (24) on the side close to the inside of the vehicle; the left outer beam (23) and the left inner beam (24) are raised to form a cavity.

3. The commercial vehicle body-in-white according to claim 2, characterized in that: The right outer plate (31) extends out from a second fixing plate (32) on the upper side of the second mounting platform (311); the second fixing plate (32) is installed with a right outer beam (33) on the side inside the vehicle; the right outer beam (33) is installed with a right inner beam (34) on the side close to the inside of the vehicle; the right outer beam (33) and the right inner beam (34) are raised to form a cavity.

4. The commercial vehicle body-in-white according to claim 3, characterized in that: The commercial vehicle body-in-white also includes a rear enclosure (5), the rear enclosure (5) including a rear outer panel (51), a rear inner cross beam (52) and a rear outer cross beam (53), the upper side of the rear outer panel (51) is bent toward the outside of the vehicle to form a second flange (511), the rear outer cross beam (53) is installed on the second flange (511), the lower end of the rear outer cross beam (53) is connected to the rear outer panel (51), and the rear inner cross beam (52) is also installed on the side of the rear outer cross beam (53) inside the vehicle.

5. The commercial vehicle body-in-white according to claim 4, characterized in that: The rear inner cross beam (52) is bent at one end close to the interior of the vehicle to form a third flange (521); a top cross beam (12) is installed on the rear side of the top cover (1); the cross section of the top cross beam (12) is in a "J" shape; one side of the top cross beam (12) is connected to the third flange (521), and the other side is connected to the second flange (511); the top cross beam (12), the rear inner cross beam (52) and the rear outer cross beam (53) form a cavity.

6. The commercial vehicle body-in-white according to claim 5, characterized in that: The commercial vehicle body-in-white also includes a first connecting plate (7), the upper side of the first connecting plate (7) is connected to a first connecting piece (71), the first connecting piece (71) is connected to a top cross beam (12), the first connecting plate (7) is L-shaped, one side of the first connecting plate (7) is connected to the rear inner cross beam (52), and the other side is connected to the left inner beam (24).

7. The commercial vehicle body-in-white according to claim 6, characterized in that: The commercial vehicle body-in-white also includes a second connecting plate (212), which is installed on the side of the first connecting plate (7) close to the outside of the vehicle, and one side of the second connecting plate (212) is connected to the left side panel (2), and the other side is connected to the rear panel (5).

8. The commercial vehicle body in white according to claim 7, characterized in that: The commercial vehicle body-in-white also includes a third connecting plate (8), the upper side of the third connecting plate (8) is connected to a second connecting piece (81), the second connecting piece (81) is connected to a top cross beam (12), the main body of the third connecting plate (8) is L-shaped, one side of the third connecting plate (8) is connected to the rear inner cross beam (52), and the other side is connected to the right inner beam (34).

9. The commercial vehicle body-in-white according to claim 8, characterized in that: The commercial vehicle body-in-white also includes a fourth connecting plate (312), which is installed on the side of the third connecting plate (8) close to the outside of the vehicle, and one side of the fourth connecting plate (312) is connected to the right side panel (3), and the other side is connected to the rear panel (5).

10. The commercial vehicle body-in-white according to claim 9, characterized in that: The commercial vehicle body-in-white also includes a front enclosure (6) and a floor (4), wherein the floor (4) is welded to the front enclosure (6), the left enclosure (2), the right enclosure (3) and the rear enclosure (5) on all sides, respectively; the front enclosure (6), the left enclosure (2), the right enclosure (3) and the rear enclosure (5) are welded to the lower side of the top cover (1), respectively; a middle plate (13) is arranged on the upper side of the top cover (1), and a front plate (14) and a rear plate (15) are respectively installed on both sides of the middle plate (13) along the driving direction of the vehicle, wherein the front plate (14) is connected to the front enclosure (6), the top plate (11) is installed on both sides of the middle plate (13), and a longitudinal beam (16) is welded to the rear plate (15), and the lower end of the longitudinal beam (16) is connected to the top cross beam (12).

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