Centralized load-bearing lightweight vehicle body structure

Abstract

This invention provides a lightweight vehicle body structure with centralized load-bearing capacity, belonging to the field of vehicle body structure technology. It includes a chassis made of carbon steel and a body made of carbon fiber composite material. The body includes two sets of modularly arranged side walls, two sets of end walls, and a roof. The bottom of the side walls and the bottom of the end walls are bent inwards towards the vehicle body and abut against the chassis. Internal and external connectors are provided between the bent portions of the chassis and the side walls, and between the bent portions of the chassis and the end walls. The top of the side walls abuts against the bottom of the roof. Mounting plates are provided inside the side walls and the roof. Annular connecting beams are provided between the end walls, side walls, and roof. The internal connectors, external connectors, mounting plates, and annular connecting beams are all fixed to corresponding modules of the vehicle body via threaded connectors. Adhesive layers are also provided at the connection points of the various modules of the vehicle body. The lightweight vehicle body structure with centralized load-bearing capacity provided by this invention can effectively reduce the overall weight of the vehicle body, improve corrosion resistance, and reduce the amount of welding.

Description

Technical Field

[0001] This invention belongs to the field of vehicle body structure technology, and more specifically, relates to a lightweight vehicle body structure with centralized load-bearing capacity. Background Technology

[0002] The car body of a high-speed train needs to withstand various dynamic and static loads, such as its own weight and the weight of passengers or cargo. When running on the line, it also needs to withstand the fluid-structure interaction caused by drastic changes in the surrounding airflow. Therefore, it has high requirements for the structural design of the car body. Thus, lightweighting of the car body structure is of great significance for increasing vehicle speed, reducing axle load, and reducing energy consumption.

[0003] In the existing technology, some high-speed train sets adopt aluminum alloy car body structure, but due to its low fatigue strength and low temperature brittleness, the safety factor is low under heavy load conditions. Typical carbon steel car body structure usually adopts thin-walled cylindrical plate beam structure, with spot welding or plug welding between the plates and beams, and arc welding between the beams and columns. After the pre-assembly welding of each car body component is completed, modular assembly welding is carried out. However, it has the disadvantages of large overall weight, poor corrosion resistance, large welding deformation, short service life, and high cost. Summary of the Invention

[0004] The purpose of this invention is to provide a lightweight vehicle body structure with centralized load-bearing, which aims to solve the technical problems of existing vehicle body structures such as large mass, poor corrosion resistance, large welding deformation, short service life, and high cost.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a lightweight vehicle body structure with centralized load-bearing, including a chassis made of carbon steel and a body made of carbon fiber composite material, wherein the body includes two sets of side walls, two sets of end walls and a roof arranged in a modular manner;

[0006] The bottom of the side wall and the bottom of the end wall are both bent inwards towards the vehicle body and abut against the chassis; internal and external connectors are provided between the chassis and the bent portion of the side wall, and between the chassis and the bent portion of the end wall.

[0007] The top of the side wall abuts against the bottom of the vehicle roof; the side wall and the interior of the vehicle roof are provided with mounting plates;

[0008] A ring-shaped connecting beam is provided between the end wall, the side wall, and the roof;

[0009] The internal connector, the external connector, the mounting plate, and the annular connecting beam are all fixed to the corresponding modules of the vehicle body via threaded connectors; an adhesive layer is also provided at the connection points of the various modules of the vehicle body.

[0010] In one possible implementation, the internal connector is a metal connecting beam, which is an angle steel structure;

[0011] At the connection between the side wall and the base frame, one side of the metal connecting beam abuts against the side wall, and the other side abuts against the bend of the side wall; wherein, the bottom of the metal connecting beam is riveted and fixed between the bend of the side wall and the base frame, and the adhesive layer is provided at the connection between the metal connecting beam and the side wall;

[0012] At the connection between the end wall and the base frame, one side of the metal connecting beam abuts against the end wall, and the other side abuts against the bend of the end wall; wherein, the bottom of the metal connecting beam is riveted and fixed between the bend of the end wall and the base frame, and the adhesive layer is provided at the junction of the metal connecting beam and the end wall.

[0013] For example, the metal connecting beam is provided with multiple sets of support ribs at intervals.

[0014] In some embodiments, the external connector is a metal connecting plate;

[0015] At the connection between the side wall and the base frame, the upper end of the metal connecting plate abuts against the outer side of the side wall, and the lower end abuts against the outer side of the base frame; wherein, the upper end of the metal connecting plate is riveted and fixed between the side wall and the metal connecting beam, and the lower end of the metal connecting plate is riveted and fixed to the base frame.

[0016] At the connection between the end wall and the base frame, the upper end of the metal connecting plate abuts against the outer side of the end wall, and the lower end abuts against the outer side of the base frame; wherein, the upper end of the metal connecting plate is riveted and fixed between the end wall and the metal connecting beam, and the lower end of the metal connecting plate is riveted and fixed to the base frame.

[0017] In one possible implementation, the transverse cross-section of the annular connecting beam is U-shaped; one side of the annular connecting beam is bolted to the end wall; the U-shaped bottom of the annular connecting beam is riveted to the side wall / roof, and the adhesive layer is provided at the connection points.

[0018] In one possible implementation, the base frame includes:

[0019] Base plate;

[0020] A continuous central beam extends along the length of the vehicle body and is located at the bottom of the floor plate;

[0021] Multiple longitudinal beams are arranged parallel to the continuous central beam and are spaced apart on both sides of the continuous central beam; and

[0022] Multiple sets of crossbeams are spaced apart at the bottom of the floor plate along the width direction of the vehicle body, and each set of crossbeams is connected to multiple reinforcing longitudinal beams.

[0023] In some embodiments, the multiple sets of said crossbeams are divided into:

[0024] Two sets of buffer beams are symmetrically arranged at both ends of the continuous beam;

[0025] Two sets of bolster beams are parallel to the two sets of buffer beams and are respectively close to both ends of the continuous central beam;

[0026] Multiple main crossbeams are spaced apart along the length of the vehicle body between the two sets of bolster beams and are parallel to the bolster beams; and

[0027] Multiple auxiliary crossbeams are spaced apart between two adjacent sets of main crossbeams, between the main crossbeams and the bolster beams, and between the bolster beams and the buffer beams.

[0028] In one possible implementation, the sidewall includes:

[0029] The upper beam has a pultruded multi-cavity structure;

[0030] Multiple first ring beams are arranged parallel to the upper beam and spaced apart vertically;

[0031] Multiple first vertical beams are arranged perpendicular to the first ring beam and are spaced apart along the length of the vehicle body; the first vertical beams are pultruded cap-shaped beams;

[0032] The first skin layer covers the skeleton structure composed of multiple first ring beams and multiple first vertical beams, and is connected to the upper beam.

[0033] In one possible implementation, the roof includes:

[0034] Multiple second ring beams are arranged in parallel and spaced vertically.

[0035] Multiple second vertical beams are arranged perpendicular to the second ring beam and are spaced apart along the length of the vehicle body; the second vertical beams are pultruded cap-shaped beams;

[0036] The second skin layer covers the skeleton structure composed of multiple second ring beams and multiple second vertical beams.

[0037] In one possible implementation, the end wall includes a skeleton structure composed of pre-embedded reinforcing ribs and a skin structure covering the inner and outer layers of the skeleton structure.

[0038] Compared with the prior art, the solution shown in this application can meet the load-bearing requirements through a carbon steel frame and adopt a carbon fiber body structure, changing the traditional whole-body load-bearing method to a frame load-bearing method, and reducing the weight of the entire body to achieve lightweight design. At the same time, corresponding internal connectors, external connectors, mounting plates and ring connecting beams are set at the connection points of each body module to increase the connection strength between each module in key parts, and the various modules of the body are connected by threaded connectors to reduce the amount of welding work and reduce the impact of weld quality on connection strength. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, 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. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 A schematic diagram of a lightweight vehicle body structure with centralized load-bearing provided in an embodiment of the present invention;

[0041] Figure 2 For the appendix Figure 1 Enlarged structural diagram at point A;

[0042] Figure 3 A schematic diagram of the installation structure of the external connector provided in an embodiment of the present invention;

[0043] Figure 4 A schematic diagram of the mounting structure of the mounting plate provided in an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the installation structure of the annular connecting beam provided in an embodiment of the present invention;

[0045] Figure 6 This is a partial structural diagram of the base frame provided in an embodiment of the present invention;

[0046] Figure 7 This is a partial structural diagram of the sidewall provided in an embodiment of the present invention;

[0047] Figure 8 A cross-sectional structural diagram of the sidewall provided in an embodiment of the present invention;

[0048] Figure 9 This is a partial structural diagram of the vehicle roof provided in an embodiment of the present invention.

[0049] In the diagram: 1. Underframe; 11. Base plate; 12. Continuous center beam; 13. Longitudinal beam; 14. Crossbeam; 141. Buffer beam; 142. Pillar beam; 143. Main crossbeam; 144. Auxiliary crossbeam; 2. Side wall; 21. Top beam; 22. First ring beam; 23. First vertical beam; 24. First skin layer; 3. Roof; 31. Second ring beam; 32. Second vertical beam; 33. Second skin layer; 4. End wall; 5. Internal connector; 51. Support rib; 6. External connector; 7. Mounting plate; 8. Circular connecting beam. Detailed Implementation

[0050] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0051] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on that other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0052] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a number" means two or more, unless otherwise explicitly specified.

[0053] Please refer to the following: Figures 1 to 9The lightweight vehicle body structure with centralized load-bearing provided by the present invention will now be described. The lightweight vehicle body structure with centralized load-bearing includes a chassis 1 made of carbon steel and a body made of carbon fiber composite material. The body includes two sets of side walls 2, two sets of end walls 4, and a roof 3, which are modularly arranged. The bottom of the side walls 2 and the bottom of the end walls 4 are bent inwards and abut against the chassis 1. Internal connectors 5 and external connectors 6 are provided between the bent portions of the chassis 1 and the side walls 2, and between the bent portions of the chassis 1 and the end walls 4. The top of the side walls 2 abuts against the bottom of the roof 3. Mounting plates 7 are provided inside the side walls 2 and the roof 3. A ring-shaped connecting beam 8 is provided between the end walls 4 and the side walls 2 and the roof 3. The internal connectors 5, external connectors 6, mounting plates 7, and ring-shaped connecting beam 8 are all fixed to the corresponding modules of the body by threaded connectors. An adhesive layer is also provided at the connection points of the various modules of the body.

[0054] Since the roof 3 is not a primary load-bearing module, in the connection structure between the side wall 2 and the end wall 4 and the roof 3, the top of the side wall 2 extends downwards to the bottom of the roof 3 to form an overlapping structure. The roof 3 is fixed to the side wall 2 on the outside of the roof 3 by rivets, and an adhesive layer is provided at the joint between the outside of the roof 3 and the outside of the side wall 2. Then, mounting plates 7 are provided on the inside of the roof 3 and the inside of the side wall 2, and the mounting plates 7 are riveted and fixed to the inside of the roof 3 and the inside of the side wall 2, respectively. That is, in this application, a stable connection between the side wall 2 and the roof 3 is achieved by fixing them on the outside and inside respectively, supplemented by an adhesive layer.

[0055] It should be noted that the vehicle body structure used in this application includes two sets of side walls 2 that are relatively mounted on the chassis 1, two sets of end walls 4 that are connected to the two ends of the two sets of side walls 2, and a roof 3 covering the top; and the two sets of side walls 2, the two sets of end walls 4 and the roof 3 of the vehicle body structure are all modular structures.

[0056] It should be understood that the body structure uses carbon fiber composite materials, which do not require load-bearing and can reduce the weight of the body to achieve the purpose of lightweighting. However, the body structure still needs to have a certain strength. In this application, targeted designs are made at the connection points of each module, which can effectively enhance the connection strength of the body structure.

[0057] The lightweight vehicle body structure with centralized load-bearing provided by this invention, compared with the prior art, can meet the load-bearing requirements through the carbon steel structure chassis 1, and adopts a body structure designed with carbon fiber materials. It changes the traditional method of load-bearing the entire vehicle body to the method of load-bearing the chassis 1, and reduces the weight of the entire vehicle body to achieve lightweight design. At the same time, corresponding internal connectors 5, external connectors 6, mounting plates 7 and annular connecting beams 8 are set at the connection points of each body module to increase the connection strength between each module in a targeted manner at key parts, and the various modules of the body are connected by threaded connectors to reduce the amount of welding work and reduce the impact of weld quality on connection strength.

[0058] Please see Figure 2 In some possible embodiments, the internal connecting member 5 is a metal connecting beam, which is an angle steel structure; at the connection between the side wall 2 and the base frame 1, one side of the metal connecting beam abuts against the side wall 2, and the other side abuts against the bend of the side wall 2; wherein, the bottom of the metal connecting beam is riveted and fixed between the bend of the side wall 2 and the base frame 1, and an adhesive layer is provided at the junction of the metal connecting beam and the side wall 2; at the connection between the end wall 4 and the base frame 1, one side of the metal connecting beam abuts against the end wall 4, and the other side abuts against the bend of the end wall 4; wherein, the bottom of the metal connecting beam is riveted and fixed between the bend of the end wall 4 and the base frame 1, and an adhesive layer is provided at the junction of the metal connecting beam and the end wall 4.

[0059] Specifically, the bottom of sidewall 2 bends inward toward the vehicle body, and the bent portion of sidewall 2 abuts against the underframe 1. The aforementioned metal connecting beam is installed on the bent portion of sidewall 2, and one side of the metal connecting beam abuts against the vertical inner wall of sidewall 2. The metal connecting beam is fixed to sidewall 2 and underframe 1 respectively by rivets, and an adhesive layer is provided at the junction of the bent portion and underframe 1 to improve strength; that is, the vertical connection between sidewall 2 and underframe 1 is achieved through this metal connecting beam. In addition, the outer side of sidewall 2 is riveted to the outer side of underframe 1 by a metal connecting plate to achieve the lateral connection of sidewall 2.

[0060] Similarly, the bottom of the end wall 4 and the side wall 2 are vertically connected by a metal connecting beam, and the end wall 4 and the base frame 1 are horizontally connected by a metal connecting plate, so as to improve the connection strength between the end wall 4 and the base frame 1.

[0061] As an important load-bearing module, the chassis 1 needs to maintain a high connection strength with the side wall 2 and the end wall 4. In this application, from both the lateral and vertical perspectives, and in combination with the internal and external structures of the vehicle body, angle steel metal connecting beams are selected on the inner side and metal connecting plates are selected on the outer side to specifically enhance the connection strength and rigidity at this point.

[0062] Please see Figure 2For example, multiple sets of support ribs 51 are provided at intervals on the metal connecting beam.

[0063] By setting multiple sets of support ribs 51, the support strength of the metal connecting beam is enhanced, thereby ensuring the connection strength and rigidity between the side wall 2 and the end wall 4 and the base frame 1.

[0064] Please see Figure 3 As a specific embodiment of the above-mentioned transverse connection, the external connector is a metal connecting plate; at the connection between the side wall 2 and the base frame 1, the upper end of the metal connecting plate abuts against the outer side of the side wall 2, and the lower end abuts against the outer side of the base frame 1; wherein, the upper end of the metal connecting plate is riveted and fixed to the side wall 2 and the metal connecting beam, and the lower end of the metal connecting plate is riveted and fixed to the base frame 1; at the connection between the end wall 4 and the base frame 1, the upper end of the metal connecting plate abuts against the outer side of the end wall 4, and the lower end abuts against the outer side of the base frame 1; wherein, the upper end of the metal connecting plate is riveted and fixed to the end wall 4 and the metal connecting beam, and the lower end of the metal connecting plate is riveted and fixed to the base frame 1.

[0065] Specifically, the metal connecting plate connected to the side wall 2 extends along the length of the vehicle body, and the metal connecting plate connected to the end wall 4 extends along the width of the vehicle body; and the metal connecting plate extends downward from the lower side of the side wall 2 or the end wall 4 to the base frame 1 so as to be fixed by rivets.

[0066] It should be understood that the three parts—metal connecting beam, metal connecting plate, and adhesive layer—cooperate with each other in the internal and external, vertical and horizontal directions to fix the side wall 2 and end wall 4 to the base frame 1.

[0067] Please see Figure 5 In some possible embodiments, the transverse cross-section of the annular connecting beam 8 is U-shaped; one side of the annular connecting beam 8 is bolted to the end wall 4; the U-shaped bottom of the annular connecting beam 8 is riveted to the side wall 2 / roof 3, and an adhesive layer is provided at the connection.

[0068] The annular connecting beam 8 has a U-shaped cross-section, forming a bent structure with an included angle between the end wall 4 and the side wall 2. The two sides of this included angle connect to the side wall 2 and the end wall 4 respectively, thus connecting the end wall 4 and the side wall 2 and enhancing the connection strength between them. Similarly, the annular connecting beam 8 between the roof 3 and the end wall 4 can also enhance the connection strength between them.

[0069] It should be understood that the annular connecting beam 8 is an integral structure. The annular connecting beam 8 surrounds the outer edge of the end wall 4 to form an inverted U-shaped structure with the opening facing downwards, connecting the side wall 2, end wall 4 and roof 3 of the vehicle body into one unit, thereby improving the connection strength at the end of the vehicle body.

[0070] Please see Figure 6In some possible embodiments, the chassis 1 includes a base plate 11, a continuous central beam 12, multiple longitudinal beams 13, and multiple sets of cross beams 14; the continuous central beam 12 extends along the length of the vehicle body and is disposed at the bottom of the base plate 11; the multiple longitudinal beams 13 are arranged parallel to the continuous central beam 12 and are spaced apart on both sides of the continuous central beam 12; the multiple sets of cross beams 14 are spaced apart along the width of the vehicle body at the bottom of the base plate 11, and each set of cross beams 14 is connected to multiple reinforcing longitudinal beams 13.

[0071] Among them, the base plate 11, the continuous central beam 12, the multiple longitudinal beams 13 and the multiple transverse beams 14 are all carbon steel structures used to achieve the purpose of main load-bearing; the multiple longitudinal beams 13 include side beams located on both sides in the width direction and reinforcing longitudinal beams 13 spaced between the side beams and the continuous central beam 12. The side beams are used to connect vertically and laterally with the side walls 2 and the end walls 4.

[0072] The setting of the full-length central beam 12 provides the basis for the carriage to realize the load-bearing mode of the underframe 1. The auxiliary setting of multiple longitudinal beams 13 and multiple transverse beams 14 can greatly increase the load-bearing capacity of the underframe 1. Furthermore, after the weight reduction of the body, the load-bearing requirements of the underframe 1 are greatly reduced. Therefore, the underframe 1 and the body complement each other to form a lightweight carriage structure with high load-bearing capacity.

[0073] Please see Figure 6 In some embodiments, the multiple sets of crossbeams 14 are divided into two sets of buffer beams 141, two sets of bolster beams 142, multiple main crossbeams 143, and multiple auxiliary crossbeams 144; the two sets of buffer beams 141 are symmetrically arranged at both ends of the continuous middle beam 12; the two sets of bolster beams 142 are parallel to the two sets of buffer beams 141 and are close to both ends of the continuous middle beam 12; the multiple main crossbeams 143 are distributed at intervals along the length of the vehicle body between the two sets of bolster beams 142 and are parallel to the bolster beams 142; the multiple auxiliary crossbeams 144 are distributed at intervals between adjacent sets of main crossbeams 143, between the main crossbeams 143 and the bolster beams 142, and between the bolster beams 142 and the buffer beams 141.

[0074] By subdividing the structure of multiple sets of crossbeams 14, the load-bearing capacity of the base frame 1 in the lateral direction is improved, while facilitating the connection between the buffer beam 141 and the end wall 4, thereby achieving a stable connection between the base frame 1 and the end wall 4.

[0075] The auxiliary crossbeam 144 is used to be added to the main load-bearing parts of the base frame 1 in order to improve the load-bearing capacity of the base frame 1 while reducing its own weight.

[0076] Please see Figure 7In some possible embodiments, the sidewall 2 includes an upper beam 21, multiple first ring beams 22, multiple first vertical beams 23, and a first skin layer 24; the upper beam 21 has a pultruded multi-cavity structure; the multiple first ring beams 22 are parallel to the upper beam 21 and are spaced apart vertically; the multiple first vertical beams 23 are perpendicular to the first ring beams 22 and are spaced apart along the length of the vehicle body; the first vertical beams 23 are pultruded cap-shaped beams; the first skin layer 24 covers the skeleton structure composed of the multiple first ring beams 22 and the multiple first vertical beams 23, and is connected to the upper beam 21.

[0077] It should be understood that the upper beam 21 has an arc-shaped structure extending towards the vehicle body and has a multi-cavity structure inside. The multi-cavity structure is spaced apart along the extension direction of the upper beam 21 to enhance the connection strength and support strength at the connection between the side wall 2 and the roof 3.

[0078] The upper beam 21, multiple first ring beams 22 and multiple first vertical beams 23 form a skeleton structure, which is covered with a first skin layer 24 to form a modular side wall 2 structure, which is convenient to assemble and meets the strength and stiffness requirements. The skeleton structure is made of carbon fiber composite material, which can ensure the required strength while reducing the self-weight of the side wall 2, thus achieving the purpose of lightweighting.

[0079] Please see Figure 9 In some possible embodiments, the roof 3 includes multiple second ring beams 31, multiple second vertical beams 32, and a second skin layer 33; the multiple second ring beams 31 are arranged in parallel and spaced vertically; the multiple second vertical beams 32 are arranged perpendicular to the second ring beams 31 and are spaced along the length of the vehicle body; the second vertical beams 32 are pultruded cap-shaped beams; the second skin layer 33 covers the skeleton structure composed of the multiple second ring beams 31 and the multiple second vertical beams 32.

[0080] Multiple second ring beams 31 and multiple second vertical beams 32 form a skeleton structure, which is covered with a second skin layer 33 to form a modular roof structure, which is convenient for assembly and meets the requirements of strength and rigidity. The roof skeleton structure is made of carbon fiber composite material, which can further reduce the vehicle's weight.

[0081] Optionally, the second skin layer 33 of the roof 3 has a thickness of 3mm, the second ring beam 31 has a hat-shaped structure, and the second longitudinal beam 13 is a pultruded hat-shaped beam. This plate-beam structure can most effectively and directly transfer external loads in a certain direction, thereby improving load-bearing capacity and structural stability.

[0082] In some possible embodiments, the end wall 4 includes a skeleton structure composed of pre-embedded reinforcing ribs and a skin structure covering the inner and outer layers of the skeleton structure.

[0083] The end wall 4 mainly bears the compression and torsional loads of the vehicle body, and is connected to the side wall 2, the roof 3, and the underframe 1. The end wall 4 is set as an inner and outer skin structure and a pre-embedded reinforcing rib, which can improve the rigidity of the end wall 4 and make the pre-embedded reinforcing rib skeleton structure form a force transmission structure.

[0084] For example, a carbon fiber composite door leaf is installed on side wall 2. The composite door leaf mainly includes a third skin layer, a top longitudinal beam, a middle longitudinal beam, a bottom longitudinal beam, a door leaf ring beam, and pultruded longitudinal beams. Furthermore, the composite door leaf is designed as a large-opening loading door structure, in single-leaf form, and incorporates a sliding door structure. The sliding door structure is driven by a rack and pinion, employing a bottom-loaded, top-and-bottom guided method. The sliding door structure mainly includes: a drive mechanism, a guide mechanism, a locking mechanism, a load-bearing mechanism, and a manual unlocking mechanism.

[0085] Furthermore, the door frame installed on side wall 2 is combined with doorposts and reinforcing beams to increase the overall strength of the large-opening loading doorway.

[0086] It should be noted that in this application, the chassis 1 is used for load bearing, the body is made of carbon fiber composite material, and through the vertical and lateral connections between the internal and external modules, the load bearing capacity of the chassis 1 can be further enhanced while ensuring the overall strength and rigidity of the carriage, and the overall weight of the carriage can be reduced by 26%, effectively achieving the goal of lightweighting the carriage.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lightweight vehicle body structure with centralized load-bearing, characterized in that, The vehicle includes a chassis (1) made of carbon steel and a body made of carbon fiber composite material, the body including two sets of side walls (2), two sets of end walls (4) and a roof (3) arranged in a modular manner; The bottom of the side wall (2) and the bottom of the end wall (4) are both bent inwards towards the vehicle body and abut against the underframe (1); an internal connector (5) and an external connector (6) are provided between the underframe (1) and the bent part of the side wall (2) and between the underframe (1) and the bent part of the end wall (4); The top of the side wall (2) abuts against the bottom of the roof (3); the side wall (2) and the roof (3) are provided with mounting plates (7); A ring-shaped connecting beam (8) is provided between the end wall (4), the side wall (2), and the roof (3); The internal connector (5), the external connector (6), the mounting plate (7), and the annular connecting beam (8) are all fixed to the corresponding modules of the vehicle body by threaded connectors; an adhesive layer is also provided at the connection points of each module of the vehicle body.

2. The lightweight vehicle body structure with centralized load-bearing as described in claim 1, characterized in that, The internal connector (5) is a metal connecting beam, which is an angle steel structure; At the connection between the side wall (2) and the base frame (1), one side of the metal connecting beam abuts against the side wall (2), and the other side abuts against the bent portion of the side wall (2); wherein, the bottom of the metal connecting beam is riveted and fixed between the bent portion of the side wall (2) and the base frame (1), and the adhesive layer is provided at the connection between the metal connecting beam and the side wall (2); At the connection between the end wall (4) and the base frame (1), one side of the metal connecting beam abuts against the end wall (4), and the other side abuts against the bent portion of the end wall (4); wherein, the bottom of the metal connecting beam is riveted and fixed between the bent portion of the end wall (4) and the base frame (1), and the adhesive layer is provided at the junction of the metal connecting beam and the end wall (4).

3. The lightweight vehicle body structure with centralized load-bearing as described in claim 2, characterized in that, Multiple sets of support ribs (51) are spaced apart on the metal connecting beam.

4. The lightweight vehicle body structure with centralized load-bearing as described in claim 2 or 3, characterized in that, The external connector (6) is a metal connecting plate; At the connection between the side wall (2) and the base frame (1), the upper end of the metal connecting plate abuts against the outer side of the side wall (2), and the lower end abuts against the outer side of the base frame (1); wherein, the upper end of the metal connecting plate is riveted and fixed between the side wall (2) and the metal connecting beam, and the lower end of the metal connecting plate is riveted and fixed to the base frame (1); At the connection between the end wall (4) and the base frame (1), the upper end of the metal connecting plate abuts against the outer side of the end wall (4), and the lower end abuts against the outer side of the base frame (1); wherein, the upper end of the metal connecting plate is riveted and fixed between the end wall (4) and the metal connecting beam, and the lower end of the metal connecting plate is riveted and fixed to the base frame (1).

5. The lightweight vehicle body structure with centralized load-bearing as described in claim 1, characterized in that, The transverse cross section of the annular connecting beam (8) is U-shaped; one side of the annular connecting beam (8) is connected to the end wall (4) by bolts; the U-shaped bottom of the annular connecting beam (8) is riveted to the side wall (2) / the roof (3), and the adhesive layer is provided at the connection.

6. The lightweight vehicle body structure with centralized load-bearing as described in claim 1, characterized in that, The base frame (1) includes: Base plate (11); A continuous central beam (12) extends along the length of the vehicle body and is located at the bottom of the base plate (11); Multiple longitudinal beams (13) are arranged parallel to the continuous central beam (12) and are spaced apart on both sides of the continuous central beam (12); and Multiple sets of crossbeams (14) are spaced apart at the bottom of the base plate (11) along the width direction of the vehicle body, and each set of crossbeams (14) is connected to multiple longitudinal beams (13).

7. The lightweight vehicle body structure with centralized load-bearing as described in claim 6, characterized in that, The multiple sets of crossbeams (14) are divided into: Two sets of buffer beams (141) are symmetrically arranged at both ends of the continuous middle beam (12); Two sets of bolster beams (142) are parallel to the two sets of buffer beams (141) and are respectively close to both ends of the continuous middle beam (12); Multiple main crossbeams (143) are spaced apart along the length of the vehicle body between the two sets of bolster beams (142) and are parallel to the bolster beams (142); and Multiple auxiliary crossbeams (144) are spaced apart between two adjacent sets of main crossbeams (143), between the main crossbeams (143) and the bolster beams (142), and between the bolster beams (142) and the buffer beams (141).

8. The lightweight vehicle body structure with centralized load-bearing as described in claim 1, characterized in that, The sidewall (2) includes: The upper beam (21) has a pultruded multi-cavity structure; Multiple first ring beams (22) are parallel to the upper beam (21) and spaced apart vertically; Multiple first vertical beams (23) are arranged perpendicular to the first ring beam (22) and are spaced apart along the length of the vehicle body; the first vertical beams (23) are pultruded cap beams; The first skin layer (24) covers the skeleton structure composed of multiple first ring beams (22) and multiple first vertical beams (23), and is connected to the upper side beam (21).

9. The lightweight vehicle body structure with centralized load-bearing as described in claim 1, characterized in that, The roof (3) includes: Multiple second ring beams (31) are arranged in parallel and spaced vertically; Multiple second vertical beams (32) are arranged perpendicular to the second ring beam (31) and are spaced apart along the length of the vehicle body; the second vertical beams (32) are pultruded cap-shaped beams; The second skin layer (33) covers the skeleton structure composed of multiple second ring beams (31) and multiple second vertical beams (32).

10. The lightweight vehicle body structure with centralized load-bearing as described in claim 1, characterized in that, The end wall (4) includes a skeleton structure composed of pre-embedded reinforcing ribs and a skin structure covering the inner and outer layers of the skeleton structure.

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