Reinforcing beam structure and non-bearing type body automobile rear floor

Abstract

The invention relates to the technical field of automobiles, in particular to a stiffening beam structure which comprises a frame beam. The frame beam comprises a first material thickness section, a second material thickness section and a third material thickness section; the frame beam comprises a first cross beam and a second cross beam; a first longitudinal beam is arranged between the first cross beam and the second cross beam; a third cross beam is arranged between every two adjacent first longitudinal beams; the second cross beam is connected with a second longitudinal beam; the first cross beam is arranged in the first material thickness section; the first longitudinal beam and the third cross beam are arranged in the second material thickness section; the second longitudinal beam is arranged in the third material thickness section; the frame beam is integrally stamped and thermally formed, sectional material thickness is adopted, and the weight of the frame beam is effectively reduced under the condition of meeting arrangement, process, cost and various properties, so that the overall weight of the rear floor of the automobile with the non-bearing body is effectively reduced, and the endurance of the automobile is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles. Specifically, the present invention relates to a reinforcing beam structure and a rear floor of a non-load-bearing body vehicle. Background Art

[0002] The rear floor skeleton of an automobile is an important part of the lower body skeleton, mainly used for the connection between the middle and rear parts and the upper and lower parts; in addition, it can be used for conventional structures such as seat installation, battery installation, seat belts, and trunk storage box connection, which are closely related to multiple dimensions such as human comfort, safety, and even the size of the use space; at present, the overall structure of the automobile rear floor is heavy and complex, greatly increasing the vehicle weight and reducing the endurance.

[0003] The applicant found through retrieval that the Chinese patent document with the publication number of 113665683A discloses a vehicle body structure for improving the side column collision performance of a non-load-bearing body on November 19, 2021, including: a non-load-bearing body, the lower body of which includes a front floor steel skeleton and a front floor fixed on the front floor steel skeleton, the front floor steel skeleton includes two sill beams arranged at intervals in the left-right direction, a front floor front cross beam and a front floor middle cross beam arranged at intervals in the front-rear direction and both fixed to the sill beams; and, a front seat front mounting cross beam located in the middle of the front floor front cross beam and the front floor middle cross beam and fixed to the sill beam, two front floor lower longitudinal beams located inside the two sill beams and both fixed to the front floor front cross beam, the front seat front mounting cross beam and the front floor middle cross beam, and an inclined reinforcing cross beam is arranged between the front floor middle cross beam and the sill beam; this device also cannot solve the above technical problems.

[0004] Therefore, in order to improve or solve at least one of the above problems, it is necessary to provide a reinforcing beam structure that can effectively reduce the weight of the rear floor of a non-load-bearing body vehicle. Summary of the Invention

[0005] The purpose of the present invention is to provide a reinforcing beam structure that can effectively reduce the weight of the rear floor of a non-load-bearing body vehicle.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a reinforcing beam structure, including a frame beam; the frame beam includes a first material thickness section, a second material thickness section, and a third material thickness section; the frame beam includes a first cross beam and a second cross beam; a first longitudinal beam is arranged between the first cross beam and the second cross beam; a third cross beam is arranged between adjacent first longitudinal beams; the second cross beam is connected to a second longitudinal beam.

[0007] The first cross beam is arranged in the first material thickness section; the first longitudinal beam and the third cross beam are arranged in the second material thickness section; the second longitudinal beam is arranged in the third material thickness section.

[0008] A first laser welded sub - part line is provided at the end of the first longitudinal beam close to the first cross beam; a second laser welded sub - part line is provided at the end of the second longitudinal beam close to the second cross beam; the second material thickness section is arranged between the first laser welded sub - part line and the second laser welded sub - part line; the first material thickness section is arranged on the side of the first laser welded sub - part line close to the first cross beam; the third material thickness section is arranged on the side of the second laser welded sub - part line close to the second longitudinal beam.

[0009] Suspension brackets are provided at both ends of the first cross beam. The suspension brackets include suspension bracket mounting plates; main positioning holes, secondary positioning holes and suspension mounting holes are respectively provided on the suspension bracket mounting plates; a bracket reinforcing plate is provided on one side of the suspension bracket mounting plate; a first reinforcing rib is provided on the bracket reinforcing plate.

[0010] A suspension reinforcing plate is provided on the side of the first cross beam away from the suspension bracket; the suspension reinforcing plates are respectively provided at both ends of the first cross beam; second reinforcing ribs, suspension sleeve mounting holes and plug welding holes are respectively provided on the suspension reinforcing plates; a plug welding avoidance opening is provided on one side of the suspension reinforcing plate.

[0011] A first front seat belt reinforcing plate and a second front seat belt reinforcing plate are respectively provided on the third cross beam; both the first front seat belt reinforcing plate and the second front seat belt reinforcing plate are arranged in the middle of the third cross beam; both the first front seat belt reinforcing plate and the second front seat belt reinforcing plate are provided with reinforcing flanges.

[0012] A first seat reinforcing bracket and a second seat reinforcing bracket are respectively provided on the side of the third cross beam away from the first front seat belt reinforcing plate; both the first seat reinforcing bracket and the second seat reinforcing bracket are arranged in the middle of the third cross beam; both the first seat reinforcing bracket and the second seat reinforcing bracket include a first welding surface; second welding surfaces are respectively provided on both sides of the first welding surface; third reinforcing ribs and waterproof nut holes are respectively provided on the first welding surface.

[0013] A seat mounting reinforcing plate is provided on the first longitudinal beam; the seat mounting reinforcing plates are respectively provided at both ends of the third cross beam; welding edges are respectively provided on both sides of the seat mounting reinforcing plate; first reinforcing plate positioning holes and liquid leakage holes are respectively provided on the seat mounting reinforcing plate.

[0014] A rear seat belt mounting reinforcing plate is connected to the first longitudinal beam; the rear seat belt mounting reinforcing plates are respectively provided at both ends of the second cross beam; reinforcing plate welding surfaces are respectively provided at both ends of the rear seat belt mounting reinforcing plate; a second reinforcing plate positioning hole is provided on the rear seat belt mounting reinforcing plate.

[0015] On one side of the rear seat belt mounting reinforcement plate, there is a battery reinforcement plate; the battery reinforcement plate is connected to the first longitudinal beam; the battery reinforcement plate includes a fourth reinforcing rib; at the end of the fourth reinforcing rib, there is a wire harness fixing hole; in the middle of the fourth reinforcing rib, there is a liquid leakage hole in the reinforcement plate; on both sides of the liquid leakage hole in the reinforcement plate, there are positioning holes respectively; on one side of the fourth reinforcing rib, there is a welding surface of the battery reinforcement plate.

[0016] At both ends of the first longitudinal beam, there are longitudinal beam positioning holes; on the first longitudinal beam, there are painting sling holes and rear frame buffer block mounting holes respectively; the painting sling holes are arranged at both ends of the second cross beam; the rear frame buffer block mounting holes are arranged at the end of the third cross beam.

[0017] A rear floor of a non - load - bearing body vehicle includes the above - mentioned reinforcing beam structure.

[0018] The beneficial effects of the present invention are as follows:

[0019] The frame beam of the present invention is integrally stamped and hot - formed, adopting a segmented material thickness. Under the conditions of meeting the requirements of layout, process, cost and various performances, the weight of the frame beam is effectively reduced, thus effectively reducing the overall weight of the rear floor of the non - load - bearing body vehicle and effectively improving the vehicle endurance; at the same time, the frame beam is reasonably laid out, the process is reasonable, the manufacturing is convenient, and the main frame beam is integrally formed, which is suitable for mass production and minimizes the manufacturing and production costs; the frame beam structure design is reliable, adopting a horizontal and vertical frame structure, which can not only meet the requirements of NVH performance, strength fatigue, safety, layout, process, etc., but also greatly reduce the number of structural parts compared with the traditional structure, reduce the production and process complexity, accelerate the production beat, reduce the cost and enhance the product competitiveness. Description of the Drawings

[0020] The following further details the specific implementation manners of the present invention with reference to the drawings, where:

[0021] Figure 1 is the top view of the reinforcing beam structure of the present invention.

[0022] Figure 2 is the bottom view of the reinforcing beam structure of the present invention.

[0023] Figure 3 is Figure 2 the partial enlarged view at A in

[0024] Figure 4 is the structural schematic diagram of the frame beam of the present invention.

[0025] Figure 5 is the structural schematic diagram of the suspension bracket of the present invention.

[0026] Figure 6Schematic diagram of the first front seat belt reinforcement plate of the present invention.

[0027] Figure 7 Schematic diagram of the seat mounting reinforcement plate of the present invention.

[0028] Figure 8 Schematic diagram of the rear seat belt mounting reinforcement plate of the present invention.

[0029] Figure 9 Schematic diagram of the battery reinforcement plate of the present invention.

[0030] Figure 10 Schematic diagram of the mount reinforcement plate of the present invention.

[0031] Figure 11 Exploded view of the reinforcement beam structure of the present invention.

[0032] The markings in the above figures are all:

[0033] The markings in the figure are:

[0034] 1. Frame beam, 101. First laser welded sub - part line, 102. Second laser welded sub - part line,

[0035] 2. First cross beam,

[0036] 3. Second cross beam,

[0037] 4. First longitudinal beam,

[0038] 5. Third cross beam, 501. First front seat belt reinforcement plate, 502. Second front seat belt reinforcement plate, 503. Reinforcement flange,

[0039] 6. Second longitudinal beam,

[0040] 7. Mount bracket, 701. Mount bracket mounting plate, 702. Main positioning hole, 703. Sub - positioning hole, 704. Mounting hole for mount, 705. Bracket reinforcement plate, 706. First reinforcing rib,

[0041] 8. Mount reinforcement plate, 801. Second reinforcing rib, 802. Mount sleeve mounting hole, 803. Plug weld hole, 804. Plug weld avoidance opening,

[0042] 9. First seat reinforcement bracket, 901. Second seat reinforcement bracket, 902. First welding surface, 903. Second welding surface, 904. Third reinforcing rib, 905. Waterproof nut hole,

[0043] 10. Seat mounting reinforcement plate,

[0044] 11. Welding edge, 111. First reinforcement plate positioning hole, 112. Leakage hole,

[0045] 12. Rear seat belt mounting reinforcement plate, 121. Reinforcement plate welding surface, 122. Second reinforcement plate positioning hole

[0046] 13. Battery reinforcement plate, 131. Fourth reinforcing rib, 132. Wiring harness fixing hole, 133. Reinforcement plate liquid leakage hole, 134. Positioning hole, 135. Battery reinforcement plate welding surface

[0047] 14. Longitudinal beam positioning hole, 141. Painting sling hole, 142. Rear buffer block mounting hole of vehicle frame Detailed implementation manners

[0048] The following further elaborates in detail on the specific implementation manners of the present invention by describing the embodiments with reference to the accompanying drawings, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitate its implementation.

[0049] Figure 1 The reinforcement beam structure includes a frame beam 1; the frame beam 1 includes a first material thickness section, a second material thickness section and a third material thickness section; the frame beam 1 includes a first cross beam 2 and a second cross beam 3; a first longitudinal beam 4 is provided between the first cross beam 2 and the second cross beam 3; a third cross beam 5 is provided between adjacent first longitudinal beams 4; the second cross beam 3 is connected with a second longitudinal beam 6.

[0050] The first cross beam 2 is arranged in the first material thickness section; the first longitudinal beam 4 and the third cross beam 5 are arranged in the second material thickness section; the second longitudinal beam 6 is arranged in the third material thickness section.

[0051] The frame beam 1 is integrally stamped and hot formed, with a segmented material thickness. Under the conditions of meeting the requirements of layout, process, cost and various performances, the weight of the frame beam 1 is effectively reduced, thereby effectively reducing the overall weight of the rear floor of the non-load-bearing body vehicle and effectively improving the vehicle endurance; at the same time, the layout of the frame beam 1 is reasonable, the process is reasonable, and the manufacturing is convenient. The frame beam 1 is integrally formed, suitable for mass production, and maximally reduces the manufacturing and production costs; the structural design of the frame beam 1 is reliable, adopting a horizontal and vertical frame structure, which can not only meet the requirements of NVH performance, strength fatigue, safety, layout, process, etc., but also greatly reduces the number of structural parts compared with the traditional structure, reduces the production and process complexity, accelerates the production beat, reduces the cost, and improves the product competitiveness.

[0052] The frame beam 1 has a 3-longitudinal and 3-transverse structure; two first longitudinal beams 4 are provided between the first cross beam 2 and the second cross beam 3, and a third cross beam 5 is provided between the two first longitudinal beams 4; a second longitudinal beam 6 is provided on the side of the second cross beam 3 away from the third cross beam 5; the second longitudinal beam 6 is arranged in the middle of the second cross beam 3; the ends of the two first longitudinal beams 4 extend towards the side of the second cross beam 3 and are respectively arranged on both sides of the second longitudinal beam 6.

[0053] At the end of the first longitudinal beam 4 close to the first cross beam 2, there is a first laser welded sub - part line 101; at the end of the second longitudinal beam 6 close to the second cross beam 3, there is a second laser welded sub - part line 102; the second material thickness section is located between the first laser welded sub - part line 101 and the second laser welded sub - part line 102; the first material thickness section is located on the side of the first laser welded sub - part line 101 close to the first cross beam 2; the third material thickness section is located on the side of the second laser welded sub - part line 102 close to the second longitudinal beam 6.

[0054] The first laser welded sub - part line 101 and the second laser welded sub - part line 102 divide the frame beam 1 into three material thicknesses. According to requirements, the material thickness of different regions can be modified. The joints, mounting points and force - transmission paths of key parts are thickened, and the material thickness of non - key regions is reduced. After laser welding, an integral hot - forming process is adopted to balance weight, aesthetics and performance; in the first material thickness section, the material thickness of the first cross beam 2 is relatively thick. The first cross beam 2 overlaps with the rear end of the sill beam and is also the attachment point of the vehicle frame suspension, belonging to a key force - transmission part; in the second material thickness section, the material thickness of the first longitudinal beam 4 and the third cross beam 5 is in the middle, stably transmitting force and making the main structure stable; in the third material thickness section, the material thickness of the second longitudinal beam 6 is the lowest, belonging to the local floor strengthening requirement; the R - angle at the intersection of each longitudinal beam and cross beam is large, with a gentle transition, meeting the force - transmission requirement to a large extent.

[0055] At both ends of the first cross beam 2, there are suspension brackets 7. The suspension bracket 7 includes a suspension bracket mounting plate 701; on the suspension bracket mounting plate 701, there are respectively a main positioning hole 702, a secondary positioning hole 703 and a suspension mounting hole 704; on one side of the suspension bracket mounting plate 701, there is a bracket reinforcement plate 705; on the bracket reinforcement plate 705, there is a first reinforcing rib 706.

[0056] Two suspension brackets 7 are symmetrically arranged at both ends of the first cross beam 2; the suspension bracket mounting plate 701 and the bracket reinforcement plate 705 are of an integral structure; the cross - section of the suspension bracket mounting plate 701 is L - shaped, and the suspension bracket mounting plate 701 and the bracket reinforcement plate 705 form a boss structure; the suspension mounting hole 704 is located in the middle of the suspension bracket mounting plate 701, and the suspension mounting hole 704 is located between the main positioning hole 702 and the secondary positioning hole 703; the first reinforcing rib 706 is a transverse rib, large enough to be spot - welded to the frame beam 1, increasing the stiffness of the key transition area; the suspension bracket 7 is connected to the frame beam 1 and the rear sill by spot welding; the overlapping edge of the suspension bracket 7 overlaps in a high - stiffness area, such as the frame beam 1 and the sill beam, mainly solving the problems of the strength of the suspension mounting point and the performance of the vehicle body torsional stiffness.

[0057] On the side of the first cross beam 2 away from the suspension bracket 7, there is a suspension reinforcement plate 8; the suspension reinforcement plates 8 are respectively arranged at both ends of the first cross beam 2; on the suspension reinforcement plates 8, there are respectively a second reinforcing rib 801, a suspension sleeve mounting hole 802 and a plug - weld hole 803; on one side of the suspension reinforcement plate 8, there is a plug - weld avoidance opening 804.

[0058] A suspension reinforcement plate 8 is provided at the bottom of the first crossbeam 2; the two suspension reinforcement plates 8 are symmetrically arranged at both ends of the first crossbeam 2; the suspension reinforcement plate 8 is welded to the first crossbeam 2 on three sides, which can improve the strength of the suspension sleeve mounting hole 802 and the NVH dynamic stiffness; the plug weld hole 803 is arranged on one side of the suspension sleeve mounting hole 802, which can strengthen the local connection strength of the suspension reinforcement plate 8 and enhance the fatigue strength on the installation large surface; two second reinforcing ribs are provided on the suspension reinforcement plate 8 to strengthen both sides of the plug weld trimming line and enhance the local stiffness of the suspension reinforcement plate 8.

[0059] A first front seat belt reinforcement plate 501 and a second front seat belt reinforcement plate 502 are respectively provided on the third crossbeam 5; both the first front seat belt reinforcement plate 501 and the second front seat belt reinforcement plate 502 are arranged in the middle of the third crossbeam 5; both the first front seat belt reinforcement plate 501 and the second front seat belt reinforcement plate 502 are provided with reinforcing flanges 503.

[0060] The first front seat belt reinforcement plate 501 and the second front seat belt reinforcement plate 502 are connected to the third crossbeam 5 by spot welding, and both the first front seat belt reinforcement plate 501 and the second front seat belt reinforcement plate 502 are welded to the third crossbeam 5 on two sides; the flanging width of the reinforcing flange 503 is sufficient, which increases the stiffness of the first front seat belt reinforcement plate 501 and the second front seat belt reinforcement plate 502 and enhances the strength of the seat belt fixing point.

[0061] A first seat strengthening bracket 9 and a second seat strengthening bracket 901 are respectively provided on the third crossbeam 5 on the side far from the first front seat belt reinforcement plate 501; both the first seat strengthening bracket 9 and the second seat strengthening bracket 901 are arranged in the middle of the third crossbeam 5; both the first seat strengthening bracket 9 and the second seat strengthening bracket 901 include a first welding surface 902; second welding surfaces 903 are respectively provided on both sides of the first welding surface 902; third reinforcing ribs 904 and waterproof nut holes 905 are respectively provided on the first welding surface 902.

[0062] Both the first seat strengthening bracket 9 and the second seat strengthening bracket 901 are arranged at the bottom of the third crossbeam 5; the first seat strengthening bracket 9 and the second seat strengthening bracket 901 are used to strengthen the seat point stiffness and the seat mode, ensure the comfort of the occupant in the cabin, and avoid resonance transmission to the seat; through the first welding surface 902 and the second welding surface 903 are multi-sided welded to form a closed cavity with the frame beam 1, greatly improving the local stiffness; the third reinforcing rib 904 is arranged in the middle of the first welding surface 902, which can effectively strengthen the local strength of the first seat strengthening bracket 9 and the second seat strengthening bracket 901.

[0063] The first longitudinal beam 4 is provided with seat mounting reinforcement plates 10; the seat mounting reinforcement plates 10 are respectively arranged at both ends of the third cross beam 5; welding edges 11 are respectively arranged on both sides of the seat mounting reinforcement plates 10; the seat mounting reinforcement plates 10 are respectively provided with first reinforcement plate positioning holes 111 and liquid leakage holes 112.

[0064] Two seat mounting reinforcement plates 10 are symmetrically arranged at both ends of the third cross beam 5; the seat mounting reinforcement plates 10 are overlapped with the wheel housing and the frame beam 1; the seat mounting through holes are arranged on the characteristic bosses in the middle of the seat mounting reinforcement plates 10 and are bolt-connected to the floor; two first reinforcement plate positioning holes 111 are arranged on the seat mounting reinforcement plates 10. After being fixed to the positioning pins on the floor through the first reinforcement plate positioning holes 111, the welding edges 11 are welded to the floor body and the frame beam 1; a continuous structure is formed from left to right, reducing the stiffness loss caused by the loss of the traditional automotive C-ring.

[0065] The first longitudinal beam 4 is connected with rear seat belt mounting reinforcement plates 12; the rear seat belt mounting reinforcement plates 12 are respectively arranged at both ends of the second cross beam 3; reinforcement plate welding surfaces 121 are respectively arranged at both ends of the rear seat belt mounting reinforcement plates 12; the rear seat belt mounting reinforcement plates 12 are provided with second reinforcement plate positioning holes 122.

[0066] Two rear seat belt mounting reinforcement plates 12 are symmetrically arranged at both ends of the second cross beam 3; second reinforcement plate positioning holes 122 are arranged on one side of the reinforcement plate welding surfaces 121; two second reinforcement plate positioning holes 122 and two reinforcement plate welding surfaces 121 are arranged on the rear seat belt mounting reinforcement plates 12; the second reinforcement plate positioning holes 122 are matched with the positioning pins on the rear floor for positioning. After the positioning is completed, the reinforcement plate welding surfaces 121 are welded to the frame beam 1 and the rear floor in three layers.

[0067] One side of the rear seat belt mounting reinforcement plate 12 is provided with a battery reinforcement plate 13; the battery reinforcement plate 13 is connected to the first longitudinal beam 4; the battery reinforcement plate 13 includes a fourth reinforcing rib 131; a wire harness fixing hole 132 is arranged at the end of the fourth reinforcing rib 131; a reinforcement plate liquid leakage hole 133 is arranged in the middle of the fourth reinforcing rib 131; positioning holes 134 are respectively arranged on both sides of the reinforcement plate liquid leakage hole 133; a battery reinforcement plate welding surface 135 is arranged on one side of the fourth reinforcing rib 131;

[0068] Longitudinal beam positioning holes 14 are arranged at both ends of the first longitudinal beam 4; painting sling holes 141 and rear frame buffer block mounting holes 142 are respectively arranged on the first longitudinal beam 4; the painting sling holes 141 are arranged at both ends of the second cross beam 3; the rear frame buffer block mounting holes 142 are arranged at the end of the third cross beam 5.

[0069] The battery reinforcement plate 13 is used to enhance the modal strength performance of the battery, ensure that there are no problems with battery fatigue and low-frequency resonance, and at the same time ensure electrical safety in the event of a rear collision of the vehicle, providing a stable power supply; the fourth reinforcing rib 131 is provided in the middle of the battery reinforcement plate 13, and the wire harness fixing hole 132, the liquid leakage hole 133 of the reinforcement plate, and the positioning hole 134 are all provided on the fourth reinforcing rib 131; the fourth reinforcing rib 131 is a through rib.

[0070] A rear floor of a non-load-bearing body vehicle includes a reinforcing beam structure.

[0071] The specific working process of the present invention is as follows:

[0072] The frame beam 1 has a structure of 3 longitudinal beams and 3 transverse beams; in the first material thickness section, the first cross beam 2 has a thicker material thickness. The first cross beam 2 overlaps with the rear end of the sill beam and is also the attachment point to the vehicle frame suspension, belonging to a key force transmission part; in the second material thickness section, the material thicknesses of the first longitudinal beam 4 and the third cross beam 5 are in the middle, stably transmitting force and making the main structure stable; in the third material thickness section, the material thickness of the second longitudinal beam 6 is the lowest, belonging to the local floor reinforcement requirement; the R angle at the intersection of each longitudinal beam and cross beam is large, with a gentle transition, meeting the force transmission requirement to a large extent; the suspension bracket 7, the suspension reinforcement plate 8, the first front seat belt reinforcement plate 501, the second front seat belt reinforcement plate 502, the first seat reinforcement bracket 9, the second seat reinforcement bracket 901, the seat mounting reinforcement plate 10, the rear seat belt mounting reinforcement plate 12, and the battery reinforcement plate 13 are connected to the frame beam 1 to form a multi-functional skeleton.

[0073] The above has described the present invention exemplarily in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention; or without improvement, the above concept and technical solution of the present invention are directly applied to other occasions, all are within the protection scope of the present invention.

Claims

1. A reinforced beam structure, characterized in that: It includes a frame beam (1); the frame beam (1) includes a first material thickness section, a second material thickness section, and a third material thickness section; the frame beam (1) includes a first cross beam (2) and a second cross beam (3); a first longitudinal beam (4) is provided between the first cross beam (2) and the second cross beam (3); a third cross beam (5) is provided between adjacent first longitudinal beams (4); the second cross beam (3) is connected to a second longitudinal beam (6). The first cross beam (2) is arranged in the first material thickness section; the first longitudinal beam (4) and the third cross beam (5) are arranged in the second material thickness section; the second longitudinal beam (6) is arranged in the third material thickness section.

2. The reinforced beam structure according to claim 1, characterized in that: A first laser welding sub - part line (101) is provided at the end of the first longitudinal beam (4) close to the first cross beam (2); a second laser welding sub - part line (102) is provided at the end of the second longitudinal beam (6) close to the second cross beam (3); the second material thickness section is arranged between the first laser welding sub - part line (101) and the second laser welding sub - part line (102); the first material thickness section is arranged on the side of the first laser welding sub - part line (101) close to the first cross beam (2); the third material thickness section is arranged on the side of the second laser welding sub - part line (102) close to the second longitudinal beam (6).

3. The stiffening beam structure according to claim 2, wherein: Suspension brackets (7) are provided at both ends of the first cross beam (2), and the suspension brackets (7) include suspension bracket mounting plates (701); main positioning holes (702), secondary positioning holes (703), and suspension mounting holes (704) are respectively provided on the suspension bracket mounting plates (701); a bracket reinforcing plate (705) is provided on one side of the suspension bracket mounting plate (701); a first reinforcing rib (706) is provided on the bracket reinforcing plate (705).

4. The reinforced beam structure according to claim 3, wherein: A suspension reinforcing plate (8) is provided on the side of the first cross beam (2) away from the suspension bracket (7); the suspension reinforcing plates (8) are respectively provided at both ends of the first cross beam (2); second reinforcing ribs (801), suspension sleeve mounting holes (802), and plug welding holes (803) are respectively provided on the suspension reinforcing plates (8); a plug welding avoidance opening (804) is provided on one side of the suspension reinforcing plate (8).

5. A reinforcing beam structure according to any one of claims 2-4, characterized in that: A first front seat belt reinforcing plate (501) and a second front seat belt reinforcing plate (502) are respectively provided on the third cross beam (5); both the first front seat belt reinforcing plate (501) and the second front seat belt reinforcing plate (502) are arranged in the middle of the third cross beam (5); both the first front seat belt reinforcing plate (501) and the second front seat belt reinforcing plate (502) are provided with reinforcing flanges (503).

6. The stiffening beam structure according to claim 5, characterized in that: On the third crossbeam (5), on the side away from the first front seat belt reinforcement plate (501), there are respectively a first seat reinforcement bracket (9) and a second seat reinforcement bracket (901); both the first seat reinforcement bracket (9) and the second seat reinforcement bracket (901) are arranged in the middle of the third crossbeam (5); both the first seat reinforcement bracket (9) and the second seat reinforcement bracket (901) include a first welding surface (902); on both sides of the first welding surface (902), there are respectively a second welding surface (903); on the first welding surface (902), there are respectively a third reinforcing rib (904) and a waterproof nut hole (905).

7. A reinforcing beam structure according to claim 6, characterized in that: On the first longitudinal beam (4), there is a seat mounting reinforcement plate (10); the seat mounting reinforcement plate (10) is respectively arranged at both ends of the third crossbeam (5); on both sides of the seat mounting reinforcement plate (10), there are respectively welding edges (11); on the seat mounting reinforcement plate (10), there are respectively a first reinforcement plate positioning hole (111) and a liquid leakage hole (112).

8. A reinforcing beam structure according to any one of claims 6-7, characterized in that: Connected to the first longitudinal beam (4) is a rear seat belt mounting reinforcement plate (12); the rear seat belt mounting reinforcement plate (12) is respectively arranged at both ends of the second crossbeam (3); at both ends of the rear seat belt mounting reinforcement plate (12), there are respectively reinforcement plate welding surfaces (121); on the rear seat belt mounting reinforcement plate (12), there is a second reinforcement plate positioning hole (122).

9. The stiffening beam structure according to claim 8, characterized in that: On one side of the rear seat belt mounting reinforcement plate (12), there is a battery reinforcement plate (13); the battery reinforcement plate (13) is connected to the first longitudinal beam (4); the battery reinforcement plate (13) includes a fourth reinforcing rib (131); at the end of the fourth reinforcing rib (131), there is a wire harness fixing hole (132); in the middle of the fourth reinforcing rib (131), there is a reinforcement plate liquid leakage hole (133); on both sides of the reinforcement plate liquid leakage hole (133), there are respectively positioning holes (134); on one side of the fourth reinforcing rib (131), there is a battery reinforcement plate welding surface (135); At both ends of the first longitudinal beam (4), there are respectively longitudinal beam positioning holes (14); on the first longitudinal beam (4), there are respectively a painting hanger hole (141) and a rear frame buffer block mounting hole (142); the painting hanger hole (141) is arranged at both ends of the second crossbeam (3); the rear frame buffer block mounting hole (142) is arranged at the end of the third crossbeam (5).

10. A rear floor of a body-on-frame vehicle, characterized in that: It includes the reinforcing beam structure according to any one of claims 1 - 9.

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