Pillarless body structure, vehicle, and assembly method of pillarless body structure

Abstract

The present application relates to the technical field of vehicle body, in particular to a B-pillar-free vehicle body structure, a vehicle and an assembly method of the B-pillar-free vehicle body structure, the B-pillar-free vehicle body structure comprising a front windshield assembly, a roof longitudinal beam, a roof rear assembly, a back door assembly and a lower vehicle body assembly, the front end of the roof longitudinal beam is fixedly connected with the middle part of the upper end of the front windshield assembly, the front end of the roof longitudinal beam is fixedly connected with the middle part of the upper end of the roof rear assembly, the middle part of the roof longitudinal beam is provided with a gull-wing door mounting part on the left and right sides; the lower end of the front windshield assembly is lap-joint fixed with the front part of the lower vehicle body assembly, the lower end of the roof rear assembly is lap-joint fixed with the rear part of the lower vehicle body assembly, the back door assembly is fixedly connected with the rear side of the roof rear assembly and the lower vehicle body assembly; the front windshield assembly, the roof longitudinal beam, the roof rear assembly, the back door assembly and the lower vehicle body assembly are all aluminum alloy integrally die-casting parts. The B-pillar-free vehicle body structure can meet the European wing opening mode of the whole side door, and can realize the lightweight, lean design and production of the vehicle body under the premise of meeting the performance.

Description

Technical Field

[0001] This invention relates to the field of vehicle body technology, specifically to a pillarless body structure, a vehicle, and an assembly method for the pillarless body structure. Background Technology

[0002] In the global context of energy conservation and emission reduction, lightweighting and lean manufacturing of automobile bodies are key research topics in automotive technology. Traditional automobile bodies consist of hundreds of parts welded through multiple processes, from individual parts to sub-assemblies, then to assemblies, and finally to the body-in-white, followed by painting and electrophoresis. This process involves numerous parts, weld points, complex processes, large factory footprints, and a long dimensional chain, hindering the achievement of lightweighting and lean manufacturing. How to achieve lightweight and lean design and production of automobile bodies through the application of lightweight materials and integrated modular design is a bottleneck problem that urgently needs to be solved.

[0003] In related technologies, a split-type automobile body is provided, including an integrated lower body and an integrated upper body. The integrated lower body includes an integrated front compartment, front floor, rear floor, and rear bulkhead, which form a frame-like, upward-opening semi-enclosed structure. The integrated upper body includes an integrated front side beam, upper left side bulkhead, upper right side bulkhead, upper rear bulkhead, and roof crossbeam, which form a frame-like, downward-opening semi-enclosed structure. The integrated structure design reduces the number of parts from hundreds to just two, significantly simplifying product design complexity. However, due to the varied shapes and complex structures of the upper body, it is impossible to achieve integrated upper body molding for all vehicle models. Summary of the Invention

[0004] The purpose of this invention is to provide a pillarless body structure, a vehicle, and an assembly method for the pillarless body structure, which can satisfy the gull-wing opening method of the entire side door, and achieve lightweight, lean design and production of the body while meeting performance requirements.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, the present invention provides a pillarless body structure, including a front windshield assembly, a roof longitudinal beam, a roof rear assembly, a tailgate assembly, and a lower body assembly. The front end of the roof longitudinal beam is fixedly connected to the upper middle part of the front windshield assembly, and the rear end of the roof longitudinal beam is fixedly connected to the upper middle part of the roof rear assembly. Gullwing door mounting portions are provided on the left and right sides of the middle part of the roof longitudinal beam. The lower end of the front windshield assembly overlaps and is fixedly connected to the front part of the lower body assembly, and the lower end of the roof rear assembly overlaps and is fixedly connected to the rear of the lower body assembly. The tailgate assembly is fixedly connected to the rear side of the roof rear assembly and the lower body assembly. The front windshield assembly, roof longitudinal beam, roof rear assembly, tailgate assembly, and lower body assembly are all integral die-cast aluminum alloy parts.

[0007] Furthermore, the front end of the top cover longitudinal beam is screwed and fixed to the middle of the upper end of the front windshield assembly, and the rear end of the top cover longitudinal beam is screwed and fixed to the middle of the upper end of the rear top cover assembly.

[0008] A positioning member is fixed between the roof longitudinal beam and the front windshield assembly and / or between the roof longitudinal beam and the rear roof assembly.

[0009] Furthermore, the overlap gaps between the roof longitudinal beam and the front windshield assembly, as well as the overlap gaps between the roof longitudinal beam and the rear roof assembly, are filled with sealant.

[0010] Furthermore, the lower end of the front windshield assembly is screwed and / or riveted to the front of the lower body assembly; the lower end of the rear roof assembly is screwed and / or riveted to the rear of the lower body assembly.

[0011] Furthermore, a guide and positioning component is fixed between the lower end of the windshield assembly and the front part of the lower body assembly and / or between the lower end of the roof rear assembly and the rear part of the lower body assembly.

[0012] Furthermore, the tailgate assembly is screwed and / or riveted to the rear of the roof assembly and the lower body assembly.

[0013] Furthermore, it also includes the side panels fixed to the left and right sides of the vehicle.

[0014] Furthermore, it also includes an outer roof panel fixed to the top of the vehicle.

[0015] Secondly, the present invention provides a vehicle including the aforementioned pillarless body structure.

[0016] Thirdly, the present invention provides an assembly method for a B-pillarless vehicle body structure, comprising:

[0017] The front windshield assembly, roof longitudinal beam, and roof rear assembly are connected to form the upper vehicle body assembly. The front end of the roof longitudinal beam is fixedly connected to the upper middle part of the front windshield assembly, and the rear end of the roof longitudinal beam is fixedly connected to the upper middle part of the roof rear assembly.

[0018] The upper body assembly is connected and fixed to the lower body assembly, the lower end of the front windshield assembly is connected and fixed to the front of the lower body assembly, and the lower end of the rear roof assembly is connected and fixed to the rear of the lower body assembly.

[0019] The tailgate assembly is fixedly connected to the rear of the roof assembly and the rear of the lower body assembly to obtain a pillarless body structure.

[0020] The present invention has the following unexpected beneficial effects:

[0021] 1. The front end of the roof longitudinal beam described in this invention is fixedly connected to the upper middle part of the windshield assembly, and the rear end of the roof longitudinal beam is connected to the upper middle part of the rear roof assembly. This connection method not only enhances the overall rigidity of the vehicle body but also provides passengers with a safer and more stable riding environment. It is worth noting that gull-wing door mounting parts are also designed on the left and right sides of the middle part of the roof longitudinal beam, which provides users with a unique door opening experience, improves the comfort of getting in and out of the vehicle, and meets users' diverse and stylish needs for door opening.

[0022] 2. The pillarless body structure of this invention includes a front windshield assembly, roof longitudinal beams, a rear roof assembly, a tailgate assembly, and a lower body assembly. All of these components are integral die-cast aluminum alloy parts. Aluminum alloy has a density only one-third that of steel, significantly reducing body weight compared to a steel body. Furthermore, the integral die-cast structure offers high design freedom; through CAE simulation analysis, precise material thickness and reinforcing rib design can be achieved, facilitating the attainment of various performance targets and realizing a weight reduction of over 25%.

[0023] 3. The B-pillarless body structure of the present invention integrates nearly 400 traditional parts into five parts. The high degree of part integration significantly reduces the development costs of tooling such as molds, fixtures, and gauges, reduces the investment in R&D and production manpower, realizes lean production of products, reduces the accumulation of dimensional chain errors, and has high precision. It can reduce the body development and debugging time and reduce the project development cycle to a certain extent.

[0024] 4. The pillarless body structure of this invention features a simple layout. Based on the distribution of stress loads, the upper body assembly adopts a ring-shaped design concept, divided into a "three-ring, one-beam" structure: the front windshield ring, the rear roof ring, the tailgate ring, and the roof longitudinal beam. Each ring forms an independent, closed structure, ensuring high reliability. The lower body components are integrally molded from a single part, and the underbody beam system forms an independent, front-to-rear continuous frame structure. This frame has smooth and rounded transitions, ensuring smooth force transmission and better absorption of collision energy. Furthermore, the use of an integrated die-cast aluminum alloy molding process significantly reduces the number of connection points. Key joints are integrally molded, reducing the risk of weld failure in traditional body structures and improving overall vehicle safety. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in 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 the present invention.

[0026] Figure 1 This is an exploded view of the B-pillar-free vehicle body structure described in this invention;

[0027] Figure 2 This is an axial view of the B-pillar-free vehicle body structure described in this invention;

[0028] Figure 3 yes Figure 2 A schematic diagram of the installation section at point I in the partial view shown.

[0029] Figure 4 yes Figure 2 A schematic diagram of the installation section at partial view II shown;

[0030] Figure 5 yes Figure 2 The shown partial view Figure III Schematic diagram of the installation section;

[0031] Figure 6 yes Figure 2 The shown partial view Figure IV Schematic diagram of the installation section;

[0032] Figure 7 This is one of the assembly process diagrams of the B-pillar-less body structure described in this invention;

[0033] Figure 8 This is the second schematic diagram of the assembly process of the B-pillarless body structure described in this invention;

[0034] Figure 9 This is an axial view of the pillarless body structure (with doors) described in this invention.

[0035] In the diagram, 1—front windshield assembly, 11—first mounting boss, 12—positioning boss, 13—first overlapping edge, 2—roof longitudinal beam, 21—second mounting boss, 22—positioning pin, 3—rear roof assembly, 31—guide groove, 4—tailgate assembly, 41—screw, 5—lower body assembly, 51—second overlapping edge, 52—guide block, 6—side panel, 7—roof panel, 71—first panel, 72—second panel, 73—third panel;

[0036] 10—First bolt, 20—Second bolt, 30—Third bolt, 40—Nut;

[0037] 50—Car door, 60—Strut, 70—Sealing strip. Detailed Implementation

[0038] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0039] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0040] In one embodiment, see Figure 1 As shown, this invention provides a pillarless body structure, including a front windshield assembly 1, a roof longitudinal beam 2, a roof rear assembly 3, a tailgate assembly 4, and a lower body assembly 5. The front end of the roof longitudinal beam 2 is fixedly connected to the upper middle of the front windshield assembly 1, and the rear end of the roof longitudinal beam 2 is fixedly connected to the upper middle of the roof rear assembly 3. Gull-wing door mounting portions are provided on the left and right sides of the middle of the roof longitudinal beam 2. The lower end of the front windshield assembly 1 overlaps and is fixedly connected to the front of the lower body assembly 5, the lower end of the roof rear assembly 3 overlaps and is fixedly connected to the rear of the lower body assembly 5, and the tailgate assembly 4 is fixedly connected to the rear of the roof rear assembly 3 and the lower body assembly 5. The front windshield assembly 1, the roof longitudinal beam 2, the roof rear assembly 3, the tailgate assembly 4, and the lower body assembly 5 are all integral die-cast aluminum alloy parts.

[0041] The windshield assembly 1 is located at the very front of the vehicle body and is designed to mount the windshield. The lower end of the windshield assembly 1 is fixedly connected to the front of the lower body assembly 5 by an overlapping joint, ensuring the stability and sealing of the vehicle body.

[0042] The roof longitudinal beam 2 serves as the core support structure for the vehicle's roof. Its front end is fixedly connected to the upper center of the windshield assembly 1, and its rear end is connected to the upper center of the rear roof assembly 3. This connection method not only enhances the overall rigidity of the vehicle body but also provides passengers with a safer and more stable riding environment. Notably, gull-wing door mounting sections are designed on the left and right sides of the middle section of the roof longitudinal beam 2. This provides users with a unique door opening experience, improves the comfort of getting in and out of the vehicle, and meets users' diverse and stylish door opening needs.

[0043] The rear roof assembly 3 is located at the top rear end of the vehicle body and is designed to connect with the tailgate assembly 4. The lower end of the rear roof assembly 3 is fixed to the rear of the lower body assembly 5 by an overlapping joint, further enhancing the stability of the vehicle body structure.

[0044] The tailgate assembly 4 is fixedly connected to the rear side of the roof rear assembly 3 and the lower body assembly 5, and is typically used to install the rear windshield and provide access to the rear of the vehicle.

[0045] The lower body assembly 5 serves as the bottom structure of the vehicle body. It not only bears the weight of the entire vehicle body but also connects the various upper components. The lower body assembly 5 is fixed to the windshield assembly 1 and the rear roof assembly 3 via an overlapping connection, ensuring the integrity and safety of the vehicle body.

[0046] Of particular note is that the front windshield assembly 1, roof longitudinal beam 2, rear roof assembly 3, tailgate assembly 4, and lower body assembly 5 all utilize unibody aluminum alloy die-casting technology. This improves the strength and precision of the body components. Aluminum alloy has only one-third the density of steel, significantly reducing the vehicle's weight compared to a steel body. Furthermore, the unibody die-casting structure offers high design flexibility. Through CAE simulation analysis, precise material thickness and reinforcing rib design facilitate the achievement of various performance targets, resulting in a weight reduction of over 25%, which contributes to improved fuel economy and handling performance.

[0047] The pillarless body structure of this invention integrates nearly 400 traditional parts into five parts, resulting in a high degree of integration. This significantly reduces the development costs of tooling such as molds, fixtures, and gauges, as well as the investment in R&D and production manpower. It enables lean production of products, reduces the accumulation of dimensional chain errors, and achieves high precision. This can reduce the body development and debugging time and shorten the project development cycle to a certain extent.

[0048] The pillarless body structure of this invention features a simple layout. Based on the distribution of stress loads, the upper body assembly adopts a ring-shaped design concept, divided into a "three-ring, one-beam" structure: the front windshield ring within the front windshield assembly 1, the rear roof ring within the rear roof assembly 3, the tailgate ring within the tailgate assembly 4, and the roof longitudinal beam 2. Each ring forms an independent, closed structure, ensuring high reliability. The lower body assembly 5 is integrally molded from a single part, and the underbody beam system forms an independent, front-to-rear continuous frame structure. This frame has a smooth and rounded transition, ensuring smooth force transmission and better absorption of collision energy. Furthermore, the use of an integrated die-cast aluminum alloy molding process significantly reduces the number of connection points. Key joints are integrally molded, reducing the risk of weld failure in traditional body structures and improving overall vehicle safety.

[0049] In summary, the pillarless body structure design of this invention achieves lightweight, high strength, and excellent safety performance of the body structure through innovative connection methods and high-performance aluminum alloy die-casting parts.

[0050] In a preferred embodiment, see Figure 2 and Figure 3 As shown, the front end of the roof longitudinal beam 2 is screwed to the upper middle of the windshield assembly 1, and the rear end of the roof longitudinal beam 2 is screwed to the upper middle of the roof rear assembly 3. This connection method not only has high connection strength, ensuring the stability of the entire vehicle roof structure, but also facilitates disassembly and maintenance, improving the maintainability of the vehicle structure.

[0051] For example, see Figure 2 and Figure 3 As shown, the upper middle part of the windshield assembly 1 is provided with a mounting groove corresponding to the front end of the roof longitudinal beam 2. Four upwardly extending first mounting bosses 11 are integrally formed within the mounting groove. The front end of the roof longitudinal beam 2 is integrally formed with four second mounting bosses 21, each corresponding to one of the first mounting bosses 11. The first mounting bosses 11 have threaded holes that match the first bolts 10, which are machined. The second mounting bosses 21 have through holes through which the second bolts 10 pass. During installation, the second bolts 10 pass through the through holes on the second mounting bosses 21 and engage with the threaded holes in the first mounting bosses 11 to achieve a stable connection between the roof longitudinal beam 2 and the windshield assembly 1. To ensure assembly accuracy, the mating surfaces of the first mounting bosses 11 and the second mounting bosses 21 are machined.

[0052] Similarly, the top cover longitudinal beam 2 and the top cover rear component 3 are securely connected by a mounting boss.

[0053] To further enhance the connection stability and positioning accuracy between the roof longitudinal beam 2 and the front windshield assembly 1, and between the roof longitudinal beam 2 and the rear roof assembly 3, positioning components are fixed between the roof longitudinal beam 2 and the front windshield assembly 1, and between the roof longitudinal beam 2 and the rear roof assembly 3. These positioning components can be specialized positioning pins, positioning blocks, or other forms of positioning devices. Their function is to provide accurate positioning references for each component during assembly, ensuring the precision and consistency of the vehicle body structure.

[0054] The fixing method of the positioning components can be selected according to the actual situation, and can be welding, screwing, or other reliable connection methods. By fixing the positioning components, the problem of overall structural instability or decreased accuracy caused by minor deviations between components during the assembly process can be greatly reduced, thereby improving the overall quality and performance of the vehicle body structure.

[0055] For example, the positioning member includes a positioning pin and a positioning hole. Specifically, see... Figure 3 As shown, a positioning boss 12 extending upwards is provided at the bottom of the mounting groove of the front windshield assembly 1. The positioning boss 12 has a positioning hole, and a positioning pin 22 adapted to the positioning hole is integrally formed on the lower side of the front end of the top cover longitudinal beam 2. To facilitate positioning and matching, a guide element is provided at the opening of the positioning hole of the positioning boss 12, and a guide cone is provided on the lower periphery of the positioning pin 22.

[0056] To further ensure positioning effectiveness, the top cover longitudinal beam 2 employs a front and rear primary / secondary positioning system. Specifically, one of the positioning pins at the front and rear ends of the top cover longitudinal beam 2 serves as the primary positioning pin, and the other as the secondary positioning pin. If the positioning pin is the primary pin, the corresponding positioning hole is designed as a round hole to restrict its movement in the front-back and left-right directions. If the positioning pin is the secondary positioning pin, the corresponding positioning hole is designed as an elongated oval hole extending along the front-back direction to restrict its movement in the left-right direction. All positioning holes must be machined to ensure accuracy.

[0057] In summary, this preferred embodiment, by employing a bolted connection method and adding positioning components, further improves the connection stability and positioning accuracy of the B-pillarless body structure, providing passengers with a safer and more reliable riding environment.

[0058] Furthermore, to ensure sealing requirements, the overlap gaps between the top cover longitudinal beam 2 and the front windshield assembly 1, as well as the overlap gaps between the top cover longitudinal beam 2 and the rear top cover assembly 3, are filled with sealant.

[0059] The sealant is a self-drying sealant. This design means it cures automatically without external heat sources or special equipment, simplifying the application process and improving production efficiency. Furthermore, depending on the specific application and performance requirements, self-drying structural adhesives can also be used for filling. Compared to ordinary sealants, structural adhesives typically have higher strength and better durability, maintaining stable sealing performance under harsher environmental conditions. Therefore, using self-drying structural adhesives for gap filling is a more suitable choice for vehicles that need to withstand heavy loads or experience extreme weather conditions.

[0060] Regardless of the type of sealant chosen, the filling process requires strict control to ensure a proper seal. Before filling, the joints should be thoroughly cleaned and dried to remove any impurities and moisture that could affect the seal. Then, using appropriate tools, apply the sealant evenly to the joints, ensuring no areas are missed or over-applied. Finally, allow the sealant to fully cure before proceeding with assembly and testing.

[0061] By employing this method of filling with sealant, the present invention not only improves the sealing performance of the pillarless body structure, but also effectively prevents the intrusion of rainwater, dust and other contaminants, providing passengers with a more comfortable, safe and reliable riding environment.

[0062] In a preferred embodiment, see Figure 2 , Figure 4 and Figure 5 As shown, the lower end of the front windshield assembly 1 is screwed and / or riveted to the front of the lower body assembly 5, and the lower end of the rear roof assembly 3 is screwed and / or riveted to the rear of the lower body assembly 5.

[0063] Specifically, the connection between the lower end of the windshield assembly 1 and the front of the lower body assembly 5 can be achieved using bolts or rivets. Bolted connections offer the advantages of easy disassembly and reassembly, facilitating maintenance and repair; while riveting provides stronger connection strength and durability, especially in areas subject to higher stress. Depending on specific design requirements and vehicle operating environment, bolted connections alone, riveting alone, or a combination of both can be used to achieve the best connection effect.

[0064] For example, the connection between the lower end of the windshield assembly 1 and the front of the lower body assembly 5 is achieved using a combination of bolts and rivets, see [link to relevant documentation]. Figure 4As shown, the left and right A-pillar areas of the front windshield assembly 1 are connected to the front of the lower body assembly 5 using a double-layer bolt connection structure. The second bolts 20, which are installed and fixed internally and externally, are symmetrically arranged. The preferred number of connection points is four on each side, subject to CAE simulation analysis. Specifically, a first overlapping edge 13 is provided at the lower end of the A-pillar area of ​​the front windshield assembly 1, and a second overlapping edge 51 matching the first overlapping edge 13 is provided at the front of the lower body assembly 5. The second bolts 20 pass through the second overlapping edge 51 and engage with the threaded holes on the first overlapping edge 13, achieving a stable connection between the front windshield assembly 1 and the lower body assembly 5. Other overlapping areas between the front windshield assembly 1 and the lower body assembly 5, such as the overlapping area between the front wall panel on the lower body assembly 5 and the front windshield assembly 1, are fixed by riveting. After riveting, self-drying sealant is applied to the pierced end of the rivet to provide corrosion protection.

[0065] Similarly, the connection between the lower end of the roof rear assembly 3 and the rear of the lower body assembly 5 also employs screwing and riveting. This connection method ensures a tight fit and stable connection between the roof and the lower body, effectively preventing loosening or abnormal noises caused by bumps or vibrations during vehicle operation. For details, see... Figure 5 As shown, the lower end of the C-pillar area of ​​the rear part of the roof assembly 3 is connected to the rear part of the lower body assembly 5 using the third bolt 30. The remaining matching areas of the C-pillar are fixed by riveting. After riveting, self-drying sealant is applied to the rivet surface at the puncture end to prevent corrosion.

[0066] In summary, by employing screw and / or riveting methods for fixing, the connection between the front windshield assembly 1 and the front of the lower body assembly 5, as well as the connection between the rear roof assembly 3 and the rear of the lower body assembly 5, is effectively guaranteed, providing a solid foundation for the overall structural stability and safety of the vehicle.

[0067] In a preferred embodiment, a guide positioning member is fixed between the lower end of the front windshield assembly 1 and the front part of the lower body assembly 5, and between the lower end of the roof rear assembly 3 and the rear part of the lower body assembly 5.

[0068] The guide and positioning components are designed to simplify the assembly process, improve assembly accuracy, and ensure the stability and consistency of the vehicle body structure. These components can be various forms of locating pins, guide blocks, or guide grooves, and they are precisely installed in the corresponding positions of the windshield assembly 1, the rear roof assembly 3, and the lower body assembly 5.

[0069] During assembly, the guide and positioning components play a guiding and alignment role. When the windshield assembly 1 or the rear roof assembly 3 is placed onto the lower body assembly 5, these components automatically align and insert into predetermined holes or slots, thereby ensuring precise fit between the various parts. This design not only improves assembly efficiency but also effectively reduces assembly problems caused by human error.

[0070] In addition, the guide and positioning components also serve a certain fixing function. After assembly, they can assist bolts, rivets, and other connectors in firmly fixing the various parts together to form a stable vehicle body structure. This design enhances the rigidity and durability of the vehicle body, improving the stability and safety of the vehicle during driving.

[0071] In summary, by introducing guiding and positioning components, this invention further optimizes the assembly process of the pillarless vehicle body structure, improves assembly accuracy and efficiency, and ensures the stability and consistency of the body structure. This design not only enhances the overall performance of the vehicle but also provides passengers with a safer and more comfortable riding experience.

[0072] For example, see Figure 5 As shown, the guide and positioning component between the lower end of the rear part of the top cover assembly 3 and the rear part of the lower body assembly 5 includes a guide block 52 and a guide groove 31. The guide block 52 is integrally formed with the lower body assembly 5, and the outer periphery of the upper end of the guide block 52 is chamfered. The guide groove 31 is integrally formed on the rear part of the top cover assembly 3, with its opening facing downwards, and the opening of the guide groove 31 is chamfered to ensure that the guide hole 52 can be smoothly inserted into the guide groove 31.

[0073] To ensure assembly accuracy, the mating surfaces of the guide block 52 and the guide groove 31 are formed using machining processes. The upper end of the guide block 52 contacts the bottom of the guide groove 31 to ensure the relative positional accuracy of the rear roof assembly 3 and the lower body assembly 5 in the vertical direction.

[0074] In a preferred embodiment, see Figure 2 and Figure 6 As shown, the tailgate assembly 4 is screwed and / or riveted to the rear of the roof rear assembly 3 and the lower body assembly 5. This connection method not only provides structural robustness but also ensures the stability and reliability of the tailgate during opening and closing.

[0075] Specifically, screwing and riveting are common mechanical connection methods that use fasteners such as bolts, nuts, or rivets to connect two or more components together. Screwings offer the advantages of easy disassembly and reassembly, facilitating maintenance and repair; while riveting provides stronger connection strength and durability, especially in areas that need to withstand greater stress.

[0076] In the connection between the tailgate assembly 4 and the rear of the roof assembly 3 and the lower body assembly 5, depending on the specific design requirements and vehicle usage environment, one can choose to use bolts alone, riveting alone, or a combination of both. This flexible choice allows the connection design to adapt to different application scenarios and performance requirements.

[0077] For example, see Figure 2 and Figure 6 As shown, threaded connection structures are provided in the left and right corner areas of the upper part of the tailgate assembly 4. There are four threaded connection structures on each side; the specific number and thread specifications are selected based on the structural design and the suitability for CAE simulation analysis. For details, see [link to documentation]. Figure 6 A connecting boss is integrally formed on the tailgate assembly 4, and a screw 41 is provided on the connecting boss. To ensure that the tailgate frame assembly does not interfere, the connecting screw 41 is arranged horizontally (i.e., in the front-to-back direction) and is manufactured by machining. Machining mounting holes are provided on the rear roof assembly 3, and the connection is secured with nuts 40. The remaining body frame components, such as the rear crossbeam area of ​​the roof and the matching area of ​​the rear panel, are fixed by riveting. After riveting, self-drying sealant is applied to the pierced rivet surface for corrosion protection.

[0078] In summary, by employing screw and / or riveting methods for fixing, the connection between the tailgate assembly 4 and the rear side of the roof rear assembly 3 is effectively guaranteed, improving the stability and safety of the vehicle body structure and providing passengers with a more reliable and comfortable riding experience. At the same time, it also meets the requirements of modern automotive manufacturing for efficient, precise, and reliable connection technologies.

[0079] In a preferred embodiment, see Figure 1 As shown, the pillarless body structure also includes side panels 6 fixed to the left and right sides of the vehicle. The side panels 6 are an important component of the body structure, covering the sides of the vehicle and providing necessary protection and support. In a pillarless body structure, the role of the side panels 6 becomes even more critical due to the elimination of the traditional B-pillar design. They not only need to withstand lateral impact forces but also need to work closely with the roof and chassis structure to ensure the overall rigidity and stability of the body.

[0080] The side panel 6 is made of carbon fiber. If cost is a concern, lower-cost engineering plastics can be used to reduce vehicle weight and improve fuel economy.

[0081] The side panel 6 is fixed to other parts of the vehicle body (such as the rear roof assembly and the lower body assembly) by adhesive bonding to form a complete vehicle body structure. Specifically, the two side panels 6 are bonded to the left and right sides of the vehicle using self-drying structural adhesive, and rivet connections are added locally based on CAE simulation analysis results.

[0082] In a preferred embodiment, see Figure 1 As shown, it also includes a roof cover 7 fixed to the top surface of the vehicle.

[0083] The outer roof panel 7 is the roof covering of the vehicle, providing a smooth surface and aesthetically pleasing appearance. In a pillarless body structure, the outer roof panel 7 works closely with structural components such as the roof longitudinal beams 2 and the rear roof assembly 3 to collectively form the load-bearing and protective system for the roof. Specifically, see... Figure 1 As shown, the outer panel 7 of the roof includes a first panel 71 that matches the upper end of the front windshield assembly 1, a second panel 72 that matches the roof longitudinal beam 2, and a third panel 73 that matches the upper side of the rear roof assembly 3.

[0084] When the outer roof panel 7 is made of glass, it is attached to the vehicle roof using glass adhesive. When the outer roof panel 7 is made of engineering plastic or carbon fiber, it is attached to the vehicle roof using structural adhesive and partial rivets to ensure the stability and safety of the roof structure.

[0085] In summary, the main frame of the pillarless body structure of this invention is made of aluminum alloy die casting material, the parts are treated with anti-corrosion surface treatment, the exterior parts are made of carbon fiber, engineering plastics or glass, and the exterior can be filmed as needed. The various parts are connected by cold connection technology such as threading, gluing, and riveting. The parts are supplied by the supplier and all processes are completed directly in the final assembly workshop, eliminating the stamping, welding and painting workshops, and subverting the traditional automobile manufacturing process.

[0086] In one embodiment, see Figure 9 As shown, the present invention provides a vehicle including the aforementioned pillarless body structure. The pillarless body structure forms an integral door opening stop on the side, with a smooth transition, and a sealing strip 70 is snapped and fixed around the perimeter of the stop to ensure the sealing performance of the integral side door. Two electric struts 60 are arranged on the top of the vehicle body, and the door lock is located in the middle of the lower part of the vehicle body to ensure the opening and locking of the entire side door 50.

[0087] In one embodiment, see Figure 7 As shown, the present invention provides an assembly method for a B-pillarless vehicle body structure, comprising:

[0088] Step 1: Connect the front windshield assembly 1, the roof longitudinal beam 2, and the roof rear assembly 3 to form the upper vehicle body assembly. The front end of the roof longitudinal beam 2 is fixedly connected to the upper middle part of the front windshield assembly 1, and the rear end of the roof longitudinal beam 2 is fixedly connected to the upper middle part of the roof rear assembly 3.

[0089] Step 2: Connect and fix the upper body assembly to the lower body assembly 5. The lower end of the front windshield assembly 1 is connected and fixed to the front of the lower body assembly 5, and the lower end of the rear roof assembly 3 is connected and fixed to the rear of the lower body assembly 5.

[0090] Step 3: Fix the tailgate assembly 4 to the rear of the roof assembly 3 and the lower body assembly 5 to obtain a pillarless body structure.

[0091] Further, see Figure 8 As shown, the assembly method further includes:

[0092] Step 5: Connect the left and right side outer panels 6 to the left and right sides of the body structure without B-pillars, respectively.

[0093] Step 6: Connect the outer roof panel 7 to the top surface of the body structure without B-pillars.

[0094] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A B-pillar-free vehicle body structure, characterized by: The application relates to a B-pillar-free vehicle body structure. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1), the roof longitudinal beam (2), the roof rear assembly (3), the back door assembly (4) and the lower vehicle body assembly (5) are all integrally pressure-cast aluminum alloy parts. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The left and right A-pillar areas of the front windshield assembly (1) are connected with the front part of the lower vehicle body assembly (5) through an inner-outer double-layer bolt connection structure.

2. The body -shell -without -pillars structure according to claim 1, characterized in that: The front end of the roof longitudinal beam (2) is fixedly connected with the middle part of the upper end of the front windshield assembly (1) through screwing. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end.

3. The pillar-free body structure according to claim 1, characterized in that: The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end.

4. The pillar-free body structure according to claim 1, characterized in that: The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end.

5. The B-pillar-free body structure according to claim 1, characterized in that: The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end.

6. The pillar-free body structure according to claim 1, characterized in that: The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end.

7. The pillar-free body structure according to claim 1, characterized in that: The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end.

8. A vehicle characterized by: The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end.

9. A method of assembling a body structure without a B-pillar according to any one of claims 1 to 7, characterized in that The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. 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The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) through the front end and / or the rear end. The front windshield assembly (1) is fixedly connected with the lower vehicle body assembly (5) The front windshield assembly (1), the roof longitudinal beam (2) and the roof rear assembly (3) are connected to form an upper body assembly, the front end of the roof longitudinal beam (2) is fixedly connected to the middle of the upper end of the front windshield assembly (1), and the rear end of the roof longitudinal beam (2) is fixedly connected to the middle of the upper end of the roof rear assembly (3); The upper body assembly is overlapped and fixed with a lower body assembly (5), the lower end of the front windshield assembly (1) is overlapped and fixed with the front part of the lower body assembly (5), and the lower end of the roof rear assembly (3) is overlapped and fixed with the rear part of the lower body assembly (5); The back door assembly (4) is fixedly connected to the rear side of the roof rear assembly (3) and the lower body assembly (5), and a B-column-free body structure is obtained.

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