A floor beam, a floor beam, and a vehicle
By combining the beam body formed by the roll forming process with the integrally molded reinforcement and the irregularly shaped floor beam, the problem of the floor beam affecting the legroom of rear passengers is solved, thereby improving safety and comfort, while reducing manufacturing costs and increasing manufacturing efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI LIXIANG AUTOMOBILE CO LTD
- Filing Date
- 2025-06-06
- Publication Date
- 2026-07-31
AI Technical Summary
While ensuring safety, the existing floor beams affect legroom for rear passengers, leading to a decrease in passenger comfort.
Design a floor beam section, which is formed by roll forming process, combined with integrally molded reinforcement and irregular structure, including a first beam section and a second beam section, with the first beam section facing forward and the second beam section facing backward, to increase legroom for rear passengers and improve the overall structural strength through reinforcement.
While ensuring vehicle safety, it increases legroom for rear passengers, simplifies manufacturing processes, reduces manufacturing costs, improves manufacturing efficiency, enhances the bending resistance of the beams, and reduces the overall vehicle weight.
Smart Images
Figure CN224576700U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle technology, specifically to a beam portion of a floor crossbeam, a floor crossbeam, and a vehicle. Background Technology
[0002] The floor crossbeam is a crucial component of a vehicle, primarily used to connect the chassis to the seats and to provide load-bearing and some protection. In the event of a collision, the floor crossbeam ensures the structural strength of the floor, reducing the likelihood of impact to passengers in the seats and thus protecting them.
[0003] However, the installation of the floor beam may reduce the legroom for rear passengers, affecting their comfort. How to improve passenger comfort while ensuring the safety of the floor beam is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0004] The purpose of this application is to provide a beam portion of a floor crossbeam, a floor crossbeam, and a vehicle that can increase legroom for rear passengers and improve passenger comfort while ensuring the structural strength of the floor and the safety of the vehicle.
[0005] To solve the above-mentioned technical problems, this application provides a beam portion of a floor beam, including a beam body and a reinforcing portion disposed in the inner cavity of the beam body; the beam body includes a first beam portion and a second beam portion along the width direction, the top end face of the first beam portion is higher than the top end face of the second beam portion; the reinforcing portion includes reinforcing members respectively disposed in the first beam portion and the second beam portion.
[0006] Optionally, the width of the circumferential overlap area of the beam is not less than 4 mm.
[0007] Optionally, the first beam and the second beam form a first stepped structure.
[0008] Optionally, the circumferential overlapping area of the beam is located between the first beam portion and the second beam portion, and is located on the facade of the first stepped structure.
[0009] Optionally, the ratio of the width of the second beam to the width of the first beam is in the range of 1.5-2.5; and / or, the ratio of the height of the second beam to the height of the first beam is in the range of 0.5-0.8.
[0010] Optionally, the width of the second beam is in the range of 55mm-65mm, and / or the height of the second beam is in the range of 20mm-30mm.
[0011] Optionally, at least some of the reinforcing members are hollow structures;
[0012] And / or, the reinforcing member is a fiber composite material component;
[0013] And / or, the reinforcing member is connected to the top wall and bottom wall of the inner cavity, respectively.
[0014] Optionally, the reinforcing part includes a first reinforcing member and a second reinforcing member. The first reinforcing member is disposed in the first beam portion, and the second reinforcing member is disposed in the second beam portion. The first reinforcing member and the second reinforcing member are integrally formed, and a second step structure is formed between the first reinforcing member and the second reinforcing member.
[0015] This application also provides a floor beam, including the beam portion as described above.
[0016] Optionally, it also includes a plurality of seat mounting portions, each of which is spaced apart along the length direction of the beam portion; the cross-section of the seat mounting portion along the width direction is U-shaped, the U-shaped structure includes a first wall portion and a second wall portion, the first wall portion is fixed to a side wall of the first beam portion away from the second beam portion, and the second wall portion is fixed to the top end face of the second beam portion.
[0017] This application also provides a vehicle including a beam portion of the floor beam as described above and at least one of the floor beams as described above.
[0018] The floor beam, floor beam, and vehicle provided in this application have the following technical advantages compared to the prior art:
[0019] In the installed state, the first beam faces the front of the vehicle and the second beam faces the rear of the vehicle. This floor beam refers to the beam located under the front seats and includes a seat mounting part for mounting the front seats. The second beam is lower in height and is located on the side facing the rear seats, which can reduce the space occupied by the rear side of the floor beam in the height direction, provide more legroom for rear passengers, and improve the riding comfort of rear passengers.
[0020] The first and second beam sections are equipped with reinforcing members to ensure the overall structural strength of the beam and thus the safety of the vehicle. At the same time, the beam is designed with an irregular shape that is higher in the front and lower in the rear. Compared with the existing technology, which sets the cross-section of the beam in the width direction as a "U-shape", it can increase the legroom for rear passengers while ensuring that the overall cross-sectional size is similar. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of the floor beam provided in the embodiment of this application;
[0022] Figure 2 yes Figure 1 Sectional view of AA;
[0023] Figure 3 yes Figure 1 BB section view.
[0024] Appendix Figures 1-3 The reference numerals in the attached figures are explained as follows:
[0025] 10 Beam section; 20 Seat mounting section; 201 Seat mounting point; 202 First wall section; 203 Second wall section; 204 Bending structure; 30 Side plate;
[0026] 1 Beam body, 11 First beam section, 111 First cavity section, 12 Second beam section, 121 Second cavity section, 13 Overlapping area;
[0027] 2. Reinforcing section; 21. First reinforcing member; 22. Second reinforcing member; 23. Reinforcing wall;
[0028] 3. Adhesive layer. Detailed Implementation
[0029] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0030] This application provides a floor beam portion, a floor beam, and a vehicle, wherein the vehicle includes the floor beam, seats, a battery pack, etc. Figure 1 As shown, the floor beam includes a beam section 10, a side panel 30, a seat mounting section 20, and other structures.
[0031] like Figure 2 As shown, the beam 10 includes a beam body 1, which is a hollow structure with an inner cavity. The beam body 1 includes a first beam part 11 and a second beam part 12 along the width direction. The height of the top end face of the first beam part 11 is higher than the height of the top end face of the second beam part 12. The bottom end faces of the first beam part 11 and the second beam part 12 can be aligned, while there is a height difference between the top end faces. The beam body 1 has an irregular structure.
[0032] In the installed state, the first beam 11 faces the front of the vehicle and the second beam 12 faces the rear of the vehicle. This floor beam refers to the beam located under the front seats and includes a seat mounting part 20 for mounting the front seats. The second beam 12 is lower in height and is located on the side facing the rear seats, which can reduce the space occupied by the rear side of the floor beam in the height direction, provide more legroom for rear passengers, and improve the riding comfort of rear passengers.
[0033] like Figure 2As shown, the beam 10 also includes a reinforcing part 2. The beam 1 has an internal cavity, and the reinforcing part 2 is disposed in the internal cavity. The internal cavity of the beam 1 includes a first cavity 111 disposed in the first beam 11 and a second cavity 121 disposed in the second beam 12. The reinforcing part 2 includes a first reinforcing member 21 and a second reinforcing member 22. The first reinforcing member 21 is disposed in the first cavity 111 and is used to reinforce the structure of the first beam 11. The second reinforcing member 22 is disposed in the second cavity 121 and is used to reinforce the structure of the second beam 12, thereby ensuring the overall structural strength and stability of the beam 10, and thus ensuring the safety of the vehicle.
[0034] By setting beam 1 to an irregular structure with a higher front and lower rear, compared to the existing technology where beam 1 has a "U-shaped" cross-section in the width direction, the legroom for rear passengers can be increased while ensuring that the overall cross-sectional size is comparable.
[0035] The beam 1 has a circumferential overlapping area 13. The sidewalls of the beam 1 can overlap in this overlapping area and be fixed by welding (such as laser brazing) in the circumferential overlapping area. In this embodiment, the beam 1 can be a roll-formed beam, formed by roll-forming a plate into a beam 1 with an inner cavity using a roll-forming device. The overlapping area 13 is formed at the roll-forming joint of the plate and fixed by welding. The radius of the fillet at the bend of the roll-formed beam can be set to 4 times the thickness of the plate. Furthermore, there is only one circumferential overlapping area 13 on the circumference of the roll-formed beam 13, which can reduce the amount of welding, simplify the forming process of the beam 1, and improve the forming efficiency of the beam 1.
[0036] Of course, the beam 1 can also be formed into a stamped part using a stamping process, and the stamped part and plate can be overlapped and welded together. Using a roll-formed beam simplifies the forming process of the beam 1 and improves the manufacturing efficiency of the beam 10. During the manufacturing process, there is no need to consider the process form of overlapping multiple parts, sealing strategies, and forming processes of multiple parts, which greatly simplifies the assembly design. Due to the reduction in the number of parts and overlapping points, the strength and stiffness of the overlapping points can be avoided, and the overall strength, stiffness, and lightweight performance are improved, which can extend the service life of the beam 10 and improve safety.
[0037] Furthermore, since the beam 1 is a one-piece structure formed by roll forming, the height of the top end face of the first beam 11 is higher than the height of the top end face of the second beam 12. The top of the beam 1 is also provided with a bending structure at the boundary between the first beam 11 and the second beam 12. This arrangement can also increase the structural strength and bending resistance of the beam 10, thereby improving the safety of the vehicle.
[0038] The beam 1 formed by the roll forming process can also use ultra-high strength steel, such as materials with a strength of 1500MPa, 1700MPa, and above. While ensuring the structural performance of the beam 1, it can be made with a relatively smaller thickness or volume, thus achieving overall vehicle lightweighting. In other words, compared to existing stamped beam 1 solutions, roll-formed beams can more efficiently improve overall performance by using ultra-high strength steel raw materials or adjusting the thickness of the beam 1 along the critical path. During a collision, the high structural strength of the beam 10 reduces the likelihood of deformation and damage.
[0039] Furthermore, the beam 1 formed by the roll forming process, compared to the beam formed by welding stamped parts, is equivalent to integrating multiple components into a single part. While maintaining comparable collision performance, it provides protection for passengers, battery packs, and other components under various operating conditions. It also reduces tooling and mold costs, simplifies OEM assembly lines, and saves on equipment, space, and logistics investment. This results in improved design and development efficiency, reduced process steps, and less material used for connecting parts, thereby lowering manufacturing costs.
[0040] like Figure 2 As shown, a first step structure is formed between the first beam 11 and the second beam 12. That is, the top end face of the second beam 12 is roughly a planar structure parallel to the vehicle floor. Of course, in this embodiment, the top end face of the second beam 12 can also be a sloping structure, that is, arranged at an angle to the floor. Forming a first step structure between the first beam 11 and the second beam 12 can facilitate providing sufficient legroom for rear passengers, while also ensuring the structural strength of the beam 1 in the width direction.
[0041] The peripheral overlapping area 13 of beam 1 is located between the first beam portion 11 and the second beam portion 12, and at the elevation of the first stepped structure. The first stepped structure includes a stepped surface and an elevation, where the stepped surface refers to the upper end surface of the second beam portion 12, and the elevation refers to the surface along the height direction facing the first beam portion 11. Of course, in this embodiment, the specific location of the peripheral overlapping area 13 of beam 1 is not limited; it can be located either on the side of the first beam portion 11 or the side of the second beam portion 12. Positioning the peripheral overlapping area 13 between the first beam portion 11 and the second beam portion 12, and at the elevation of the first stepped structure, also makes the upper surfaces of the first beam portion 11 and the second beam portion 12 flat, resulting in a smoother overall structure and avoiding interference with bolts used for installing seats, battery packs, etc. Furthermore, when a vehicle collision occurs, the impact force acts on the crossbeam 10, reducing the probability of deformation in the peripheral overlapping area 13.
[0042] The width L of the overlap area around the beam body is not less than 4mm, that is, the width of the overlapping area at the roll-press joint of the roll-pressed beam is not less than 4mm. In other words, the plate is roll-pressed into a cylindrical structure by a roll-pressing device. The cross-section of the cylindrical structure along the width direction is high on one side and low on the other. The first and last ends of the plate are stacked to form an overlapping area 13, and the first and last ends of the plate are fixed in the overlapping area 13 by welding (e.g., Figure 3 The width L of the overlapping area 13 (C) refers to the dimension along the perimeter of the cylindrical structure. The width L of the overlapping area 13 is not less than 4mm, which can ensure the connection stability of the beam 1 at the roll joint, thereby ensuring the overall structural strength of the beam 10.
[0043] The ratio of the width of the second beam 12 to the width of the first beam 11 is in the range of 1.5-2.5. This ratio can be 1.5, 2, 2.5, etc., or it can be 1 or 3. Setting the ratio of the width of the second beam 12 to the width of the first beam 11 in the range of 1.5-2.5 can ensure the overall structural strength of the beam 1, while also ensuring that the second beam 12 can provide sufficient legroom for rear passengers.
[0044] The ratio of the height of the second beam 12 to the height of the first beam 11 is in the range of 0.5-0.8. This ratio can be 0.5, 0.6, 0.7, 0.8, etc., or it can be 0.4 or 0.9. Setting the ratio of the height of the second beam 12 to the height of the first beam 11 in the range of 0.5-0.8 can ensure the overall structural strength of the beam 1, while also ensuring that the second beam 12 can provide sufficient legroom for rear passengers.
[0045] In this embodiment, the size of the first beam 11 and the second beam 12 is not limited. Preferably, the width of the second beam 12 is in the range of 55mm-65mm, such as 55mm, 58mm, 60mm, 62mm, 65mm, etc. Of course, the width of the second beam 12 can also be set to be less than 55mm or greater than 65mm, such as 50mm, 70mm, etc. Setting the width of the second beam 12 in the range of 55mm-65mm can ensure that the second beam 12 can provide sufficient legroom for rear passengers while also ensuring the width of the first beam 11, thereby ensuring the overall structural strength of the beam 1.
[0046] The height of the second beam 12 is preferably set in the range of 20mm-30mm, such as 20mm, 25mm, 30mm, etc., or the height of the second beam 12 can be set in the range of 15mm, 40mm, etc. Setting the height of the second beam 12 in the range of 20mm-30mm can ensure that the second beam 12 can provide sufficient legroom for rear passengers, while also ensuring the structural strength at the location of the second beam 12.
[0047] In this embodiment, at least some of the reinforcing members are hollow structures, which facilitates weight reduction. It is permissible for some reinforcing members to be hollow, some to be solid, or all to be hollow.
[0048] When the reinforcing member is set as a hollow structure, such as Figure 2 As shown, both the first reinforcing member 21 and the second reinforcing member 22 are hollow structures with a roughly square cross-section along the width direction. The two side walls of this square structure can form a support plate between the top and bottom walls of the inner cavity, respectively. The top and bottom walls of the reinforcing member abut against the top and bottom walls of the inner cavity, resulting in a large abutment area and a large number of support plates. Therefore, the hollow structure of the reinforcing member is more conducive to improving the structural strength, while also simplifying the overall structure, reducing weight, and facilitating installation.
[0049] Furthermore, in this embodiment, the number of reinforcing members in the first beam 11 and the second beam 12 is not limited, and the number of reinforcing members in the first beam 11 and the second beam 12 can be the same or different, depending on the actual structure and strength requirements.
[0050] The reinforcing part 2 is a one-piece structure. Of course, the reinforcing part 2 can also be set as a split structure, that is, each reinforcing part is independent of each other, or some reinforcing parts are set independently. During installation, each reinforcing part is installed into the corresponding cavity. When the reinforcing part 2 is set as a one-piece structure, the overall structure can be simplified, and the assembly process can be simplified and the assembly efficiency can be improved.
[0051] like Figure 2As shown, a reinforcing member is provided in each of the first beam portion 11 and the second beam portion 12, that is, the number of the first reinforcing member 21 and the second reinforcing member 22 is one each, and the first reinforcing member 21 and the second reinforcing member 22 are integrally formed, and a second stepped structure is formed between them. The top wall of the first reinforcing member 21 abuts against the top wall of the first beam portion 11, and the top wall of the second reinforcing member 22 abuts against the top wall of the second beam portion 12. Of course, in this embodiment, the number of the first reinforcing member 21 and the second reinforcing member 22 is not limited. For example, the number of the first reinforcing member 21 can be two or more, or the number of the second reinforcing member 22 can also be two or more. When the first reinforcing member 21 and the second reinforcing member 22 are each provided with one and the first reinforcing member 21 and the second reinforcing member 22 are integrally formed to form a second stepped structure, the overall structure can be simplified and the installation operation can be simplified.
[0052] Both the first reinforcing member 21 and the second reinforcing member 22 are hollow structures, and as Figure 2 shown, the reinforcing portion 2 further includes a reinforcing wall 23, and the reinforcing wall 23 is located between the first reinforcing member 21 and the second reinforcing member 22. The first reinforcing member 21 and the second reinforcing member 22 share a side wall portion, and the reinforcing portion 2 has a structure similar to a "day" character. In this way, in the height direction, the side wall portions on both sides in the width direction of the beam body 1 and the three side wall portions arranged along the height direction of the reinforcing portion 2 provide support, and the sectional moment of inertia of itself is greatly improved, strengthening its own stiffness. In this way, when the floor cross beam receives a collision impact from the front, the ability of the floor cross beam to resist bending increases, thereby improving the bending resistance performance of the floor cross beam under the condition of equal weight.
[0053] The reinforcing member is a fiber composite material member. Of course, the reinforcing member can also be set as a metal member, such as a stamping part, etc., and can be fixed to the beam body 1 by welding or other means. By setting the reinforcing member as a fiber composite material member, the overall light weight of the floor cross beam can be further realized.
[0054] The top of the reinforcing portion 2 abuts against the top wall of the inner cavity, and the bottom of the reinforcing portion 2 abuts against the bottom wall of the inner cavity. Specifically, the first reinforcing member 21 abuts against the top wall and the bottom wall of the first cavity portion 111 respectively to provide structural reinforcement to the first beam portion 11 in the height direction, and the second reinforcing member 22 abuts against the top wall and the bottom wall of the second cavity portion 121 respectively to provide structural reinforcement to the second beam portion 12 in the height direction. That is to say, the reinforcing portion 2 is arranged along the height direction of the beam body 1 and can provide support for the height direction of the beam body 1 to increase the structural strength of the beam body 1 in the height direction and ensure the stability and safety of the seat installation.
[0055] The reinforcing member can be connected and fixed to the inner wall of the first cavity 111 and the inner wall of the second cavity 121 by means of bonding or other methods, such as using expanding foam, which facilitates assembly and can effectively ensure the installation stability of the reinforcing member in the inner cavity after installation, thereby ensuring the structural reinforcement of the beam 1.
[0056] Of course, the reinforcing member and the corresponding cavity can also be fixed by interference fit or by snap-fit, etc. However, fixing by adhesive can simplify the overall structure and reduce the requirements for dimensional accuracy, which is flexible and the assembly process is simple and efficient.
[0057] The floor beam provided in this embodiment is formed into beam 1 by roll forming process, and reinforced by an integrally formed fiber composite material part 2. The reinforced part 2 is bonded and fixed to the beam 1 by adhesive layer 3. Compared with the prior art, which sets multiple stamped parts and splices them by welding, it can effectively reduce the number of parts, simplify the overall structure, simplify the installation operation, shorten the early design and development cycle, improve manufacturing efficiency and reduce costs.
[0058] like Figure 1 As shown, the floor beam also includes two side plates 30, which are fixed to the two ends of the beam 10 along its length. The side plates 30 can be made of stamped parts and can be fixed to the beam 1 by welding or other means. The side plates 30 can be fixed to the vehicle door sill with fasteners. The structure of the side plates 30 can match the door sill, which can reduce the overall vehicle cost and increase the interface bandwidth of the door sill of the platform model.
[0059] like Figure 3 As shown, the seat mounting section 20 is provided with seat mounting points 201 for mounting seats. The seat mounting sections 20 are located on the top of the beam section 10, and each seat mounting section 20 is spaced apart along the length of the beam section 10 and fixed to the beam body 1. The seat, according to the cross-section of the mounting section, is as follows: Figure 3 The U-shaped structure shown has its open end facing the beam 1, and its two sidewalls at the open end forming a first wall portion 202 and a second wall portion 203, respectively. The first wall portion 202 is attached to and welded to the side wall of the first beam portion 11 away from the second beam portion 12 (e.g., ...). Figure 3 (At welding position D), the second wall portion 203 is provided with a bending structure 204, which is attached to and welded to the top end face of the second beam portion 12 (e.g., at welding position D). Figure 3 The welding position E), the setting of the bending structure 204 can increase the contact area between the U-shaped structure and the top wall of the second beam 12, improve the support of the beam 1 for the seat mounting part 20, and also avoid the situation where the top wall of the second beam 12 bends due to concentrated force.
[0060] The seat mounting part 20 and the beam 1 can be fixed by welding. Alternatively, the seat mounting part 20 can be fixed to the beam 1 by fasteners or other means. Welding can ensure that the stress is even at all points of the connection between the seat mounting part 20 and the beam 1, thus ensuring the overall structural strength.
[0061] The top wall of beam 1 is also provided with clearance holes, through which spot welding can be performed to weld the bottom of beam 1 to the front floor panel of the vehicle.
[0062] To meet the development strategy requirements of battery pack-equipped vehicles, and to satisfy the needs of battery pack mounting points and modal requirements with the most streamlined structure, locating the mounting points in beam 10 is the optimal choice. Beam 10 also includes battery pack mounting points for installing the battery packs. Specifically, the top wall of beam 1 has through holes, and the bottom wall of beam 1 has corresponding mounting holes. Mounting bolts pass through the through holes and are fixed to the battery pack via the mounting holes. These through holes and mounting holes can be formed using laser cutting. Placing the battery pack mounting points on beam 10 satisfies the rigidity requirements of the mounting points.
[0063] The beam 1 with embedded fiber composite material provided in this embodiment can achieve optimal performance by optimizing the cross-sectional structure through topology path optimization and using the most efficient material thickness ratio. Furthermore, experiments have shown that, compared to the existing method of welding multiple stamped parts together to form floor beams of the same specifications and requirements, the floor beams prepared using the above embodiment can achieve a 23% reduction in the number of parts, a 14% reduction in connection costs, and a 28% reduction in weight. This also reduces the investment in factory equipment and the area of usable space, improving the efficiency of lightweight design and manufacturing.
[0064] Furthermore, the reinforcement 2 increases the overall structural strength of the beam 10, enabling it to withstand greater impact forces and thus protect the battery pack inside the vehicle. Compared to beams 1 made using conventional methods, the floor beam 10 provided in this embodiment can improve its bending resistance by using ultra-high-strength steel as raw material and adjusting the thickness of the roll-pressed plates. In a frontal collision, it disperses collision energy to prevent the vehicle body from being crushed, and in a side collision, it fully absorbs collision energy to prevent the intrusion of battery modules inside the battery pack.
[0065] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not 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 this application.
[0066] Furthermore, 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 application, "multiple" means two or more, unless otherwise explicitly specified.
[0067] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A beam portion of a floor beam, characterized in that, It includes a beam body (1) and a reinforcing part (2) disposed in the inner cavity of the beam body (1); The beam (1) includes a first beam portion (11) and a second beam portion (12) along the width direction, wherein the top end face of the first beam portion (11) is higher than the top end face of the second beam portion (12); The reinforcing part (2) includes reinforcing members respectively disposed in the first beam part (11) and the second beam part (12).
2. The beam portion of the floor beam according to claim 1, characterized in that, The width of the circumferential overlapping area (13) of the beam (1) is not less than 4 mm.
3. The beam portion of the floor beam according to claim 1, characterized in that, The first beam (11) and the second beam (12) form a first step structure.
4. The beam portion of the floor beam according to claim 3, characterized in that, The circumferential overlapping area (13) of the beam (1) is located between the first beam part (11) and the second beam part (12), and is located on the facade of the first step structure.
5. The beam portion of the floor beam according to any one of claims 1-4, characterized in that, The ratio of the width of the second beam (12) to the width of the first beam (11) is in the range of 1.5-2.5; And / or, the ratio of the height of the second beam (12) to the height of the first beam (11) is in the range of 0.5-0.
8.
6. The beam portion of the floor beam according to any one of claims 1-4, characterized in that, The width of the second beam (12) is in the range of 55mm-65mm; and / or the height of the second beam (12) is in the range of 20mm-30mm.
7. The beam portion of the floor beam according to any one of claims 1-4, characterized in that, At least some of the reinforcing members are hollow structures; And / or, the reinforcing member is a fiber composite material component; And / or, the reinforcing member is connected to the top wall and bottom wall of the inner cavity, respectively.
8. The beam portion of the floor beam according to any one of claims 1-4, characterized in that, The reinforcing part (2) includes a first reinforcing member (21) and a second reinforcing member (22). The first reinforcing member (21) is disposed in the first beam part (11), and the second reinforcing member (22) is disposed in the second beam part (12). The first reinforcing member (21) and the second reinforcing member (22) are integrally formed, and a second step structure is formed between the first reinforcing member (21) and the second reinforcing member (22).
9. The beam portion of the floor beam according to claim 8, characterized in that, Both the first reinforcing member (21) and the second reinforcing member (22) are hollow structures, and the reinforcing part (2) also includes a reinforcing wall (23), which is located between the first reinforcing member (21) and the second reinforcing member (22).
10. A floor beam, characterized in that, Includes the beam portion as described in any one of claims 1-9.
11. The floor beam according to claim 10, characterized in that, It also includes a plurality of seat mounting parts (20), each of the seat mounting parts (20) being spaced apart along the length direction of the beam; The seat mounting part (20) has a U-shaped cross-section along the width direction. The U-shaped structure includes a first wall part (202) and a second wall part (203). The first wall part (202) is fixed to the side wall of the first beam part (11) away from the second beam part (12), and the second wall part (203) is fixed to the top end face of the second beam part (12).
12. A vehicle, characterized in that, Includes the beam portion of the floor beam as described in any one of claims 1-9 and at least one of the floor beams as described in claim 10 or 11.