Rear side member, rear floor assembly, and vehicle

Abstract

A rear side member, a rear floor assembly, and a vehicle. The rear side member comprises: a rear side member body (1) comprising first curved areas (101); a plurality of tangent points arranged in the first curved areas (101); and a plurality of main reinforcing ribs (2) linearly arranged on the rear side member body (1), wherein the main reinforcing ribs (2) are arranged corresponding to the tangent points, the plurality of tangent points form a plurality of tangent lines, and the plurality of main reinforcing ribs (2) are respectively consistent in direction with the plurality of tangent lines. The structure can improve the constraint effect of the overall structure of the rear side member on collision force transmission.

Description

Rear longitudinal beam, rear floor assembly and vehicle Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202410886110.6, filed on July 03, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to, but is not limited to, the technical field of vehicle body structure, in particular to a rear longitudinal beam, a rear floor assembly and a vehicle. BACKGROUND

[0003] The rear floor of a vehicle refers to the rear part of the lower body structure, which is an important part of the vehicle body and together with the front floor forms the floor structure of the vehicle. The rear floor generally includes a rear floor framework assembly, a rear floor panel assembly and a rear wall assembly. The rear floor framework assembly is a load-bearing structure that bears the rear seat, trunk, auxiliary frame, rear shock absorber and other structures of the vehicle, and has very high requirements for torsional stiffness, strength and durability, etc. At the same time, it bears the transmission of structural force through a rear longitudinal beam on the left and right sides during rear collision. The structural strength of the rear longitudinal beam plays a crucial role in protecting the battery, fuel tank and passengers from injury during rear collision of the vehicle. SUMMARY

[0004] The following is a summary of the subject matter of the detailed description herein. This summary is not intended to limit the scope of the claims.

[0005] In a first aspect, the present application provides a rear longitudinal beam, comprising: a rear longitudinal beam body having a first curved area, a plurality of cut points being arranged in the first curved area; a plurality of main reinforcing ribs being arranged in a straight line on the rear longitudinal beam body, the plurality of main reinforcing ribs being arranged corresponding to the plurality of cut points respectively, a plurality of tangent lines being formed through the plurality of cut points, and the plurality of main reinforcing ribs being arranged in the same direction as the plurality of tangent lines respectively.

[0006] The present application provides a rear longitudinal beam, a plurality of main reinforcing ribs being distributed along the tangent direction of the first curved area, so that the plurality of main reinforcing ribs are arranged in sequence along the contour of the rear longitudinal beam body. When the rear longitudinal beam is impacted, the straight-line design of the main reinforcing ribs improves the transmission efficiency of the force, and the plurality of main reinforcing ribs are sequentially stressed along the contour of the rear longitudinal beam body where the first curved area is located, follow the transmission path of the impact force, and ensure the continuity of the stress, thereby improving the constraint effect of the overall structure of the rear longitudinal beam on the transmission of the impact force. By combining the trend of the rear longitudinal beam body with the distribution of the main reinforcing ribs, the plurality of main reinforcing ribs can sequentially absorb the impact energy and improve the transmission efficiency of the impact energy. Thus, the problem that the arrangement form of the reinforcing ribs in the current rear longitudinal beam has limited constraint effect on the transmission of the impact force and cannot well absorb the impact energy is solved.

[0007] In an alternative embodiment, the plurality of main reinforcing ribs are respectively coincident with the plurality of tangent lines.

[0008] The rear longitudinal beam is sequentially subjected to the impact force along the direction from the first end to the second end when impacted. The first curved area is usually the most likely to deform or even break due to its edge position. Therefore, a plurality of main reinforcing ribs are respectively arranged at positions coincident with a plurality of tangent lines. When the rear longitudinal beam is impacted, the plurality of main reinforcing ribs can be sequentially subjected to force along the profile of the first curved area, thereby improving the structural strength of the weak position of the first curved area, further improving the constraint effect of the overall structure of the rear longitudinal beam when transmitting the impact force, and maximizing the transmission efficiency of the impact energy.

[0009] In an alternative embodiment, the plurality of main reinforcing ribs are respectively parallel to the plurality of tangent lines.

[0010] In an alternative embodiment, the rear longitudinal beam further comprises a second curved area corresponding to the first curved area and arranged on one side of the first curved area, and a space is formed between the first curved area and the second curved area to accommodate the main reinforcing ribs.

[0011] The second curved area is a part of the curved area away from the edge of the rear longitudinal beam body along the profile of the rear longitudinal beam body. The second curved area is arranged corresponding to the first curved area, and the space formed between the first curved area and the second curved area limits the positions of the two ends of the plurality of main reinforcing ribs, so that the two ends of the plurality of main reinforcing ribs do not exceed the first curved area and the second curved area, avoiding interference between the plurality of main reinforcing ribs and the external structure of the rear longitudinal beam body, and ensuring the normality of the arrangement of the plurality of main reinforcing ribs along the rear longitudinal beam body.

[0012] In an alternative embodiment, the rear longitudinal beam further comprises a first peripheral reinforcing rib consistent with the direction of the first curved area, and a second peripheral reinforcing rib consistent with the direction of the second curved area, and the plurality of main reinforcing ribs are arranged between the first peripheral reinforcing rib and the second peripheral reinforcing rib.

[0013] The first peripheral reinforcing rib and the second peripheral reinforcing rib are arranged along the direction of the rear longitudinal beam body, and simultaneously serve as force transmission ribs to assist in bearing the impact force when the rear longitudinal beam is impacted, thereby improving the structural strength of the rear longitudinal beam.

[0014] In an alternative embodiment, any of the main reinforcing ribs is connected to the first peripheral reinforcing rib and / or the second peripheral reinforcing rib.

[0015] The main reinforcing rib is connected to the first peripheral reinforcing rib and the second peripheral reinforcing rib, so that the main reinforcing rib, the first peripheral reinforcing rib and the second peripheral reinforcing rib form an integral structure, the integrity of each reinforcing rib on the rear longitudinal beam body is improved, and the structural strength of the rear longitudinal beam is further improved.

[0016] In an optional embodiment, a first connecting point and a second connecting point are formed between the two main reinforcing ribs and the second peripheral reinforcing rib, and a third connecting point and a fourth connecting point are formed between the two main reinforcing ribs and the first peripheral reinforcing rib; and a line connecting the first connecting point, the second connecting point, the third connecting point and the fourth connecting point forms a trapezoid.

[0017] The line connecting the first connecting point, the second connecting point, the third connecting point and the fourth connecting point forms a trapezoid with a short side length, which is close to a triangle, and can improve the structural strength of the rear longitudinal beam to a certain extent. At this time, the length of the reinforcing rib between the first peripheral reinforcing rib and the second peripheral reinforcing rib is relatively short, which is beneficial to reduce the weight of the rear longitudinal beam and reduce the overall height of the rear longitudinal beam.

[0018] In an optional embodiment, the first connecting point coincides with the second connecting point; or the third connecting point coincides with the fourth connecting point.

[0019] At this time, after the two main reinforcing ribs are connected to the first peripheral reinforcing rib or the two main reinforcing ribs are connected to the second peripheral reinforcing rib, a structure close to a triangle can be formed, and the stability of the triangle can greatly improve the structural strength of the rear longitudinal beam.

[0020] In an optional embodiment, the main reinforcing rib includes a first main reinforcing rib, a second main reinforcing rib and a fourth main reinforcing rib; the rear longitudinal beam further includes a secondary reinforcing rib arranged between the first peripheral reinforcing rib and the second peripheral reinforcing rib, the secondary reinforcing rib is connected to the first peripheral reinforcing rib and the second peripheral reinforcing rib respectively; the secondary reinforcing rib is located between the first main reinforcing rib and the second main reinforcing rib; and / or the secondary reinforcing rib is located between the first main reinforcing rib and the fourth main reinforcing rib.

[0021] The structure close to a triangle formed by the first main reinforcing rib, the second main reinforcing rib and the first peripheral reinforcing rib is split into two structures close to a triangle by the secondary reinforcing rib. The structure close to a triangle formed by the first main reinforcing rib, the fourth main reinforcing rib and the second peripheral reinforcing rib is split into two structures close to a triangle by the secondary reinforcing rib. The structural stability of the triangle structure further improves the structural strength of the rear longitudinal beam.

[0022] In an alternative embodiment, the main reinforcing rib, the first peripheral reinforcing rib, the second peripheral reinforcing rib and the auxiliary reinforcing rib are integrally formed by die casting from an aluminum alloy.

[0023] In an alternative embodiment, the rear longitudinal beam further comprises a plurality of auxiliary reinforcing ribs arranged between the first peripheral reinforcing rib and the second peripheral reinforcing rib, the auxiliary reinforcing ribs being connected to the first peripheral reinforcing rib and / or the second peripheral reinforcing rib, and the auxiliary reinforcing ribs being arranged in a staggered manner.

[0024] In a second aspect, the present application further provides a rear floor assembly comprising the rear longitudinal beam according to any one of the above embodiments, and two rear longitudinal beams are arranged on the left and right sides of the rear floor assembly, and the impact force generated when the rear floor assembly is impacted is transmitted to the rear longitudinal beam.

[0025] The present application provides a rear floor assembly, and the rear longitudinal beam is arranged on the left and right sides of the rear floor assembly as a main structural member for bearing the impact force of the rear floor assembly. When the rear floor assembly is impacted, the impact force generated is transmitted to the rear longitudinal beam, and the rear longitudinal beam effectively absorbs the impact energy through the rear longitudinal beam body and the plurality of reinforcing ribs arranged on the rear longitudinal beam body, thereby reducing the possibility of damage to the vehicle body and protecting the rear seat, trunk, subframe, rear shock absorber and other structures of the vehicle.

[0026] In a third aspect, the present application further provides a vehicle comprising: a tire; and the rear floor assembly according to any one of the above embodiments, and the bending degree of the first curved region of the rear longitudinal beam corresponds to the outer contour of the tire.

[0027] The present application provides a vehicle, and the bending degree of the first curved region of the rear longitudinal beam corresponds to the outer contour of the tire, thereby ensuring the integrity of the overall contour of the vehicle and improving the aesthetic appearance.

[0028] Other aspects can become apparent from a review of the drawings and detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the specific embodiments or prior art in the present application, the drawings needed to be used in the specific embodiments or prior art description will be briefly introduced as follows. The drawings in the following description show some embodiments of the present application. For those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0030] FIG. 1 is a structural schematic view of a partial rear floor assembly in which a rear longitudinal beam according to the present application is arranged.

[0031] FIG. 2 is another structural schematic view of a partial rear floor assembly in which a rear longitudinal beam according to the present application is arranged.

[0032] Fig. 3 is a structural schematic diagram of a part of a rear floor assembly in which a rear longitudinal beam is located in a first variant of the embodiment provided by the present application.

[0033] Fig. 4 is a structural schematic diagram of a part of a rear floor assembly in which a rear longitudinal beam is located in a second variant of the embodiment provided by the present application.

[0034] Fig. 5 is a structural schematic diagram of a part of a rear floor assembly in which a rear longitudinal beam is located in a third variant of the embodiment provided by the present application.

[0035] Fig. 6 is a structural schematic diagram of a part of a rear floor assembly in which a rear longitudinal beam is located in a fourth variant of the embodiment provided by the present application.

[0036] Fig. 7 is a structural schematic diagram of a rear floor assembly provided by the present application.

[0037] Fig. 8 is a structural schematic diagram of a rear longitudinal beam involved in the related art.

[0038] Legend: 1, rear longitudinal beam body; 11, first end; 12, second end; 101, first curved area; 102, second curved area; 2, main reinforcing rib; 201, first main reinforcing rib; 202, second main reinforcing rib; 203, third main reinforcing rib; 204, fourth main reinforcing rib; 3, first peripheral reinforcing rib; 4, second peripheral reinforcing rib; 5, auxiliary reinforcing rib; 6, auxiliary reinforcing rib; a, first connecting point; b, second connecting point; c, third connecting point; d, fourth connecting point; 10, rear longitudinal beam; 100, rear floor assembly; d1, rear longitudinal beam body; d2, intermediate reinforcing rib; d3, side reinforcing rib. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0040] At present, the arrangement form of the reinforcing rib in the rear longitudinal beam in the related technology adopts a fishbone type structure form, that is, as shown in FIG. 8, one middle reinforcing rib d2 is arranged along the entire length direction of the rear longitudinal beam body d1, and plays a main supporting role; a plurality of side reinforcing ribs d3 are distributed on both sides of the middle reinforcing rib d2, and play an auxiliary supporting role. The overall structure formed by the middle reinforcing rib d2 and the plurality of side reinforcing ribs d3 improves the structural strength of the rear longitudinal beam body d1, so as to cope with the action of the structural force in the rear collision. Although this arrangement form of the reinforcing rib can improve the structural strength of the rear longitudinal beam, the constraint action is limited when the collision force is transmitted, and the collision energy cannot be well absorbed.

[0041] Therefore, the present application provides a rear longitudinal beam, a rear floor assembly and a vehicle.

[0042] The embodiments of the present application will be described below in conjunction with FIGS. 1-7.

[0043] According to an aspect of the embodiments of the present application, a rear longitudinal beam 10 is provided. As shown in FIGS. 1 and 2, the rear longitudinal beam 10 comprises a rear longitudinal beam body 1, a first curved area 101 and a plurality of main reinforcing ribs 2.

[0044] The rear longitudinal beam body 1 has the first curved area 101; a plurality of cut points are arranged in the first curved area 101. The plurality of main reinforcing ribs 2 are arranged linearly on the rear longitudinal beam body 1, the plurality of main reinforcing ribs 2 are respectively arranged corresponding to the plurality of cut points, a plurality of tangent lines are respectively formed through the plurality of cut points, and the plurality of main reinforcing ribs 2 are respectively consistent with the directions of the plurality of tangent lines. In some embodiments, the plurality of main reinforcing ribs 2 respectively coincide with the plurality of tangent lines (FIGS. 1 and 2). In other embodiments, the plurality of main reinforcing ribs 2 respectively parallel to the plurality of tangent lines (FIGS. 3-6).

[0045] Specifically, as shown in FIGS. 1 and 2, the rear longitudinal beam body 1 is the main structural member of the rear longitudinal beam 10, and plays a main energy absorption role when the rear longitudinal beam is subjected to a collision. Most of the collision energy is absorbed by the rear longitudinal beam body 1. The first curved area 101 formed by the rear longitudinal beam body 1 is designed to correspond to the arc-shaped outer contour of the vehicle tire, that is, the first curved area 101 is a part of the curved area close to the edge of the rear longitudinal beam body 1 divided along the contour of the rear longitudinal beam body 1. When the rear longitudinal beam 10 is subjected to an impact, the rear longitudinal beam body 1 will be subjected to a collision force in turn along the direction of the first end 11 to the second end 12.

[0046] The embodiment provides a rear longitudinal beam, as shown in FIG. 1 and FIG. 2, a plurality of main reinforcing ribs 2 are distributed along the tangent direction of the first curve area 101 and are arranged in a structure coinciding with / parallel to the tangent of the first curve area 101, so that the plurality of main reinforcing ribs 2 are sequentially arranged along the contour of the rear longitudinal beam body 1. When the rear longitudinal beam 10 is impacted, the linear design of the main reinforcing rib 2 improves the force transmission efficiency, the plurality of main reinforcing ribs 2 sequentially bear the force along the contour of the rear longitudinal beam body 1 where the first curve area 101 is located, follow the collision force transmission path, and ensure the continuity of the force, thereby improving the constraint effect of the overall structure of the rear longitudinal beam on the collision force transmission. The trend of the rear longitudinal beam body 1 is combined with the distribution of the main reinforcing rib 2, and the plurality of main reinforcing ribs 2 can sequentially absorb the collision energy and improve the collision energy transmission efficiency. Thus, the problem that the arrangement form of the reinforcing rib in the current rear longitudinal beam has limited constraint effect on the collision force transmission and cannot well absorb the collision energy is solved.

[0047] Meanwhile, each main reinforcing rib 2 plays the maximum role in the range of its mechanical properties, and the maximum benefit is obtained with the least material, which is beneficial to the lightweight development of the vehicle.

[0048] In addition, as shown in FIG. 1 and FIG. 2, no matter what angle the rear longitudinal beam 10 is impacted, the impact direction is always parallel or coincides with the arrangement direction of one of the main reinforcing ribs 2, so that this main reinforcing rib 2 can be preferentially stressed, and the collision energy can be absorbed by cooperating with the common action of the other main reinforcing ribs 2. Taking the third main reinforcing rib 203 arranged in the horizontal direction as an example, when the rear longitudinal beam 10 is impacted in the horizontal direction from the right side (the right side in FIG. 2, i.e., the rear side of the vehicle), the third main reinforcing rib 203 preferentially bears the collision force and sequentially transmits the collision force to the second main reinforcing rib 202, the first main reinforcing rib 201 and the fourth main reinforcing rib 204, thereby sequentially ensuring the continuity of the force borne by the plurality of main reinforcing ribs 2.

[0049] It should be noted that FIG. 1 and FIG. 2 only show the structure of four main reinforcing ribs 2, and in fact, the distribution mode of the plurality of main reinforcing ribs 2 needs to be reasonably arranged according to the results of the simulation model under the condition of meeting the rear impact performance. Therefore, the specific arrangement position and quantity of the plurality of main reinforcing ribs 2 may be different in different vehicle models, and the specific arrangement mode is based on the actual test condition.

[0050] Further, as shown in FIG. 3, FIG. 4, FIG. 5 and FIG. 6, four variant embodiments are provided, in which the plurality of main reinforcing ribs 2 are arranged in a structure parallel to the tangent of the first curve area 101, thereby following the collision force transmission path and maximizing the collision energy transmission efficiency.

[0051] Meanwhile, a rear longitudinal beam provided in the related art as shown in FIG. 8 employs an arrangement of using an overall structure formed by the intermediate reinforcing rib d2 and the plurality of side reinforcing ribs d3 to improve the structural strength of the rear longitudinal beam body d1, which, although can improve the structural strength of the rear longitudinal beam, inevitably causes the arrangement of the reinforcing ribs to be numerous and the overall structure to be overly complex, which restricts the lightweight development of the vehicle body. In the embodiment of the present application, the trend of the rear longitudinal beam 10 is combined with the distribution of the reinforcing ribs, so that the rear longitudinal beam can have a structural strength comparable to or even greater than that of a conventional rear longitudinal beam with fewer reinforcing ribs, thereby reducing the overall weight of the vehicle.

[0052] In addition, a rear longitudinal beam provided in the related art as shown in FIG. 8 has a large number of reinforcing ribs arranged therein, and the overall structure is overly complex, which inevitably causes the overall height of the rear longitudinal beam to increase, thereby limiting the arrangement space of the vehicle chassis. In the embodiment of the present application, the trend of the rear longitudinal beam 10 is combined with the distribution of the reinforcing ribs, so that the number of the reinforcing ribs is reduced, and accordingly the height of the overall structure of the rear longitudinal beam is reduced, thereby saving more arrangement space for the vehicle chassis.

[0053] In one embodiment, as shown in FIGS. 1 and 2, the plurality of main reinforcing ribs 2 are respectively arranged to coincide with the plurality of tangent lines.

[0054] Specifically, as shown in FIGS. 1 and 2, the rear longitudinal beam 10 will be subjected to the impact force along the trend direction from the first end 11 to the second end 12 when impacted, and the first curve region 101 is usually the most likely to deform or even break due to the edge position. Therefore, the plurality of main reinforcing ribs 2 are arranged to coincide with the plurality of tangent lines. When the rear longitudinal beam 10 is impacted, the plurality of main reinforcing ribs 2 can be sequentially subjected to the force along the contour of the first curve region 101, thereby improving the structural strength of the weak position of the first curve region 101, further improving the constraint effect of the overall structure of the rear longitudinal beam when transmitting the impact force, and maximizing the transmission efficiency of the impact energy.

[0055] In one embodiment, as shown in FIGS. 1 and 2, the rear longitudinal beam 10 further includes a second curve region 102 arranged on one side of the first curve region 101 corresponding to the first curve region 101, and a space for accommodating the main reinforcing rib 2 is formed between the first curve region 101 and the second curve region 102.

[0056] Specifically, as shown in FIG. 1 and FIG. 2, the second curve area 102 is a part of the curve area away from the edge of the rear longitudinal beam body 1, which is divided along the contour of the rear longitudinal beam body 1. The second curve area 102 is arranged correspondingly to the first curve area 101, and the space formed between the first curve area 101 and the second curve area 102 limits the position of the two ends of the plurality of main reinforcing ribs 2, so that the two ends of the plurality of main reinforcing ribs 2 do not exceed the first curve area 101 and the second curve area 102, avoiding the interference between the plurality of main reinforcing ribs 2 and the external structure of the rear longitudinal beam body 1, and ensuring the normality of the arrangement of the plurality of main reinforcing ribs 2 along the rear longitudinal beam body 1.

[0057] In an embodiment, as shown in FIG. 1 and FIG. 2, the rear longitudinal beam 10 further comprises a first peripheral reinforcing rib 3 consistent with the trend of the first curve area 101, and a second peripheral reinforcing rib 4 consistent with the trend of the second curve area 102, and the plurality of main reinforcing ribs 2 are arranged between the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4.

[0058] Specifically, as shown in FIG. 1 and FIG. 2, when the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4 are arranged along the trend of the rear longitudinal beam body 1, they simultaneously act as force transmission ribs to assist in bearing the impact force when the rear longitudinal beam 10 is impacted, thereby improving the structural strength of the rear longitudinal beam 10.

[0059] In an embodiment, as shown in FIG. 1 and FIG. 2, any main reinforcing rib 2 is connected to the first peripheral reinforcing rib 3 and / or the second peripheral reinforcing rib 4.

[0060] Specifically, as shown in FIG. 1 and FIG. 2, the main reinforcing rib 2 is connected to the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4, so that the main reinforcing rib 2, the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4 form an integrated structure, thereby improving the integrity of each reinforcing rib on the rear longitudinal beam body 1, and further improving the structural strength of the rear longitudinal beam 10.

[0061] Further, as an implementation, part of the main reinforcing ribs 2 are connected to the first peripheral reinforcing rib 3. As another implementation, part of the main reinforcing ribs 2 are connected to the second peripheral reinforcing rib 4. As yet another implementation, part of the main reinforcing ribs 2 are connected to both the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4.

[0062] In an embodiment, as shown in FIG. 1 and FIG. 2, two main reinforcing ribs 2 form a first connection point a and a second connection point b between the two main reinforcing ribs 2 and the second peripheral reinforcing rib 4, and form a third connection point c and a fourth connection point d between the two main reinforcing ribs 2 and the first peripheral reinforcing rib 3. The line between the first connection point a, the second connection point b, the third connection point c and the fourth connection point d forms a trapezoid.

[0063] Specifically, as shown in FIG. 1 and FIG. 2, the lines between the first connecting point a, the second connecting point b, the third connecting point c and the fourth connecting point d, which are limited by the edges of the first peripheral reinforcing rib 3 or the second peripheral reinforcing rib 4, form a trapezoid with a very small short side length, which is approximately a triangle, and can improve the structural strength of the rear longitudinal beam 10 to a certain extent. At this time, the length of the reinforcing rib between the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4 is relatively short, which is beneficial to reduce the weight of the rear longitudinal beam 10 and reduce the overall height of the rear longitudinal beam 10.

[0064] In one embodiment, the first connecting point a coincides with the second connecting point b; or the third connecting point c coincides with the fourth connecting point d.

[0065] Specifically, at this time, after the two main reinforcing ribs 2 meet the first peripheral reinforcing rib 3 or the two main reinforcing ribs 2 meet the second peripheral reinforcing rib 4, an approximately triangular structure can be formed correspondingly, which can greatly improve the structural strength of the rear longitudinal beam 10 by using the stability of the triangle.

[0066] Further, as shown in FIG. 1 and FIG. 2, as an embodiment, the first main reinforcing rib 201 and the second main reinforcing rib 202 in the main reinforcing rib 2 and the first peripheral reinforcing rib 3 jointly form an approximately triangular structure, and more specifically, form a quadrilateral structure with the bottom edge slightly inwardly bent.

[0067] Further, as shown in FIG. 1 and FIG. 2, as another embodiment, the first main reinforcing rib 201 and the fourth main reinforcing rib 204 in the main reinforcing rib 2 and the second peripheral reinforcing rib 4 jointly form an approximately triangular structure, and more specifically, form a fan-shaped structure with the part of the second peripheral reinforcing rib 4 as the arc edge.

[0068] It should be noted that when the several main reinforcing ribs 2 are distributed along the tangential direction of the first curved section 101, the shape formed after the main reinforcing ribs 2 meet the first peripheral reinforcing rib 3 and / or the second peripheral reinforcing rib 4 is limited by the distance between the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4. When the distance between the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4 is small, i.e., as shown in FIG. 1 and FIG. 2, the two main reinforcing ribs 2 form a trapezoid with a very small short side length after meeting the first peripheral reinforcing rib 3 and / or the second peripheral reinforcing rib 4, which is approximately a triangle, and the structural strength of the rear longitudinal beam 10 can be improved to a certain extent, and at this time, the length of the reinforcing rib between the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4 is relatively short, which is beneficial to reduce the weight of the rear longitudinal beam 10 and reduce the overall height of the rear longitudinal beam 10. When the distance between the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4 is large, the two main reinforcing ribs 2 form one or two triangles after meeting the first peripheral reinforcing rib 3 and / or the second peripheral reinforcing rib 4, and the structural strength of the rear longitudinal beam 10 can be greatly improved by using the stability of the triangle, but at this time, the length of the reinforcing rib between the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4 is relatively long, which is not conducive to reducing the weight of the rear longitudinal beam 10 and reducing the overall height of the rear longitudinal beam 10. Therefore, according to the results of the simulation model, the two arrangement modes are reasonably selected under the condition of meeting the rear collision performance.

[0069] In one embodiment, as shown in FIG. 1 and FIG. 2, the main reinforcing rib 2 includes a first main reinforcing rib 201, a second main reinforcing rib 202, and a fourth main reinforcing rib 204. The rear longitudinal beam 10 further includes a secondary reinforcing rib 5 arranged between the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4, and the secondary reinforcing rib 5 meets the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4, respectively. The secondary reinforcing rib 5 is located between the first main reinforcing rib 201 and the second main reinforcing rib 202; and / or the secondary reinforcing rib 5 is located between the first main reinforcing rib 201 and the fourth main reinforcing rib 204.

[0070] Specifically, as shown in FIG. 1 and FIG. 2, the approximately triangular structure formed by the first main reinforcing rib 201, the second main reinforcing rib 202, and the first peripheral reinforcing rib 3 is split into two approximately triangular structures by the secondary reinforcing rib 5. The approximately triangular structure formed by the first main reinforcing rib 201, the fourth main reinforcing rib 204, and the second peripheral reinforcing rib 4 is split into two approximately triangular structures by the secondary reinforcing rib 5. The structural stability of the triangular structure further improves the structural strength of the rear longitudinal beam 10.

[0071] In one embodiment, as shown in FIG. 1 and FIG. 2, the rear longitudinal beam 10 further includes a plurality of auxiliary reinforcing ribs 6 arranged between the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4, and the plurality of auxiliary reinforcing ribs 6 meet the first peripheral reinforcing rib 3 and / or the second peripheral reinforcing rib 4. The plurality of auxiliary reinforcing ribs 6 are arranged alternately.

[0072] Specifically, as shown in FIG. 1 and FIG. 2, the auxiliary reinforcing rib 6 is staggered with the main reinforcing rib 2 between the first peripheral reinforcing rib 3 and the second peripheral reinforcing rib 4. The positions of the auxiliary reinforcing rib 6 are reasonably distributed so that the main reinforcing rib 2, the first peripheral reinforcing rib 3, the second peripheral reinforcing rib 4 and the auxiliary reinforcing rib 6 respectively form a triangular structure. The structural stability of the triangular structure is utilized to further improve the structural strength of the rear longitudinal beam 10.

[0073] In one embodiment, as shown in FIG. 1 and FIG. 2, the main reinforcing rib 2, the first peripheral reinforcing rib 3, the second peripheral reinforcing rib 4 and the auxiliary reinforcing rib 5 are integrally formed on the rear longitudinal beam body 1 by aluminum alloy die casting. The main reinforcing rib 2, the first peripheral reinforcing rib 3, the second peripheral reinforcing rib 4 and the auxiliary reinforcing rib 5 are integrally formed on the rear longitudinal beam body 1 by aluminum alloy die casting.

[0074] In the embodiment, on the basis of the straight transmission path of the main reinforcing rib 2, the first peripheral reinforcing rib 3 and / or the second peripheral reinforcing rib 4 are matched, and the auxiliary reinforcing rib 6 and the auxiliary reinforcing rib 6 are added, so that a plurality of nested triangular structures are formed between the reinforcing ribs. Since any two sides determine the third side, the distance between the two end points of each side is fixed, so the angle between the two sides is also fixed. This feature limits the change of the angle and the length of the side when the triangle is subjected to external force, thereby having strong stability. In geometry, a triangle has the least number of vertices and edges, which makes its structure relatively simple and more stable. The sum of the internal angles of a triangle is always 180 degrees, which limits the deformation of the triangle when subjected to external force, further enhancing its stability. Using the principle of the above triangular structure, the nested triangular structure formed by the reinforcing ribs on the rear longitudinal beam body 1 in the embodiment can further improve the structural stability of the rear longitudinal beam 10, thereby improving the crashworthiness of the rear longitudinal beam 10.

[0075] The rear longitudinal beam 10 provided in the embodiment can reduce the weight and height of the rear longitudinal beam 10 by distributing the main reinforcing ribs 2 along the tangent direction of the first curved section 101 on the rear longitudinal beam body 1, and reasonably distributing the first peripheral reinforcing rib 3, the second peripheral reinforcing rib 4, the auxiliary reinforcing rib 5 and the auxiliary reinforcing rib 6.

[0076] The rear longitudinal beam provided in the related art as shown in FIG. 8 employs an arrangement of using the overall structure formed by the intermediate reinforcing rib d2 and the plurality of side reinforcing ribs d3 to improve the structural strength of the rear longitudinal beam body d1, which, although can improve the structural strength of the rear longitudinal beam, inevitably causes the arrangement of the reinforcing ribs to be numerous and the overall structure to be overly complex, thereby restricting the lightweight development of the vehicle body. In the embodiments of the present application, the support function of the intermediate reinforcing rib d2 is abandoned, the plurality of main reinforcing ribs 2 arranged on the rear longitudinal beam body 1 are distributed along the tangent direction of the first curve area 101, the first peripheral reinforcing rib 3, the second peripheral reinforcing rib 4, the auxiliary reinforcing rib 5 and the auxiliary reinforcing rib 6 are reasonably distributed, the trend of the rear longitudinal beam 10 is combined with the distribution of the reinforcing ribs, and the rear longitudinal beam 10 with less reinforcing ribs can have a structural strength comparable to or even greater than that of the conventional rear longitudinal beam, thereby reducing the overall weight of the vehicle. According to the calculation, the rear floor assembly provided with the rear longitudinal beam of the embodiments of the present application can reduce the weight by 8% compared with the same type of rear floor assembly provided with the conventional rear longitudinal beam.

[0077] In addition, the rear longitudinal beam provided in the related art as shown in FIG. 8 inevitably causes the overall height of the rear longitudinal beam to increase due to the numerous arrangement of the reinforcing ribs and the overly complex overall structure, thereby causing the arrangement space of the vehicle chassis to be limited. In the embodiments of the present application, the plurality of main reinforcing ribs 2 arranged on the rear longitudinal beam body 1 are distributed along the tangent direction of the first curve area 101, the first peripheral reinforcing rib 3, the second peripheral reinforcing rib 4, the auxiliary reinforcing rib 5 and the auxiliary reinforcing rib 6 are reasonably distributed, the trend of the rear longitudinal beam 10 is combined with the distribution of the reinforcing ribs, the number of the reinforcing ribs is reduced, and accordingly the height of the overall structure of the rear longitudinal beam is reduced, thereby saving more arrangement space for the vehicle chassis. According to the calculation, the height of the rear longitudinal beam provided in the embodiments of the present application is reduced by 15% compared with the height of the conventional rear longitudinal beam.

[0078] The data comparison between the rear longitudinal beam provided in the embodiments of the present application and the rear longitudinal beam provided in the related art is shown in Table 1.

[0079] As shown in Table 1 above, according to the simulation model, the positions of the reinforcing ribs are reasonably arranged, the rear longitudinal beam height is reduced by 21 mm, the number of the reinforcing ribs is reduced by 28, the weight of the two rear longitudinal beams is reduced by 3.5 kg, and the cost of the two rear longitudinal beams is reduced by 175 yuan under the condition of meeting the rear collision performance.

[0080] According to another aspect of the embodiments of the present application, a rear floor assembly 100 is further provided. As shown in FIG. 7, the rear floor assembly 100 comprises the rear longitudinal beam 10 in any of the above embodiments.

[0081] Two rear longitudinal beams 10 are located on the left and right sides of the rear floor assembly 100, and the impact force formed when the rear floor assembly 100 is impacted is transmitted to the rear longitudinal beams 10 in the first direction.

[0082] The embodiment of the present application provides a rear floor assembly, as shown in Figure 7, the rear longitudinal beam 10 is a main structural member for bearing the impact force in the rear floor assembly 100, extends in the first direction, and is arranged on the left and right sides of the rear floor assembly 100. When the rear floor assembly 100 is impacted, the impact force formed is transmitted to the rear longitudinal beam 10 in the first direction, and the rear longitudinal beam 10 effectively absorbs the impact energy by the rear longitudinal beam body 1 and the plurality of reinforcing ribs arranged on the rear longitudinal beam body 1, reduces the possibility of damage to the vehicle body, and protects the rear seat, trunk, auxiliary frame, rear shock absorber and other structures of the vehicle.

[0083] Further, as shown in Figure 7, the side parts of the plurality of reinforcing ribs arranged in the two rear longitudinal beams 10 of the rear floor assembly 100 are arranged opposite to each other. For example, the reinforcing ribs on the two rear longitudinal beams 10 of the rear floor assembly 100 are arranged on the inner side parts of the two rear longitudinal beams 10.

[0084] Further, because the rear floor assembly 100 includes the rear longitudinal beam 10, it also has the same effect as the rear longitudinal beam 10, which will not be repeated here.

[0085] According to another aspect of the embodiment of the present application, a vehicle is also provided, which includes a tire and the rear floor assembly 100 in any of the above embodiments.

[0086] The rear floor assembly 100 includes the rear longitudinal beam 10, and the bending degree of the first curved area 101 in the rear longitudinal beam 10 is arranged to correspond to the outer contour of the tire.

[0087] The embodiment of the present application provides a vehicle, and the bending degree of the first curved area 101 in the rear longitudinal beam 10 is arranged to correspond to the outer contour of the tire, which ensures the integrity of the overall contour of the vehicle and improves the aesthetic appearance.

[0088] Further, because the vehicle includes the rear floor assembly 100, it also has the same effect as the rear floor assembly 100, which will not be repeated here.

[0089] Although the embodiments of the present application are described in conjunction with the accompanying drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A rear longitudinal beam, comprising: a rear longitudinal beam body (1) having a first curved region (101) with a plurality of tangent points arranged on the first curved region (101) ; a plurality of main reinforcing ribs (2) arranged linearly on the rear longitudinal beam body (1), the plurality of main reinforcing ribs (2) being arranged correspondingly to the plurality of tangent points respectively, a plurality of tangent lines being formed through the plurality of tangent points, and the plurality of main reinforcing ribs (2) being arranged correspondingly to the plurality of tangent lines respectively.

2. The rear longitudinal beam according to claim 1, wherein, The plurality of main reinforcing ribs (2) coincide with the plurality of tangent lines respectively.

3. The rear longitudinal beam according to claim 1, wherein, The plurality of main reinforcing ribs (2) are parallel to the plurality of tangent lines respectively. 4.The rear longitudinal beam according to claim 2, further comprising a second curved region (102) arranged on one side of the first curved region (101) correspondingly to the first curved region (101), and a space for accommodating the main reinforcing ribs (2) being formed between the first curved region (101) and the second curved region (102). 5.The rear longitudinal beam according to claim 4, further comprising a first peripheral reinforcing rib (3) arranged correspondingly to the first curved region (101), and a second peripheral reinforcing rib (4) arranged correspondingly to the second curved region (102), and the plurality of main reinforcing ribs (2) being arranged between the first peripheral reinforcing rib (3) and the second peripheral reinforcing rib (4).

6. The rear longitudinal beam according to claim 5, wherein, Any of the main reinforcing ribs (2) is connected to the first peripheral reinforcing rib (3) and / or the second peripheral reinforcing rib (4). 7.The rear longitudinal beam according to claim 6, wherein two of the main reinforcing ribs (2) and the second peripheral reinforcing rib (4) form a first connecting point (a) and a second connecting point (b), and the two of the main reinforcing ribs (2) and the first peripheral reinforcing rib (3) form a third connecting point (c) and a fourth connecting point (d) ; a line connecting the first connecting point (a), the second connecting point (b), the third connecting point (c) and the fourth connecting point (d) forms a trapezoid. 8.The rear longitudinal beam according to claim 7, wherein the first connecting point (a) coincides with the second connecting point (b) ; or the third connecting point (c) coincides with the fourth connecting point (d). 9.The rear longitudinal beam according to claim 7 or 8, wherein the main reinforcing ribs (2) comprise a first main reinforcing rib (201), a second main reinforcing rib (202) and a fourth main reinforcing rib (204) ; the rear longitudinal beam further comprises a sub-reinforcing rib (5) arranged between the first peripheral reinforcing rib (3) and the second peripheral reinforcing rib (4), the sub-reinforcing rib (5) being connected to the first peripheral reinforcing rib (3) and the second peripheral reinforcing rib (4) respectively; the sub-reinforcing rib (5) is located between the first main reinforcing rib (201) and the second main reinforcing rib (202), and / or the sub-reinforcing rib (5) is located between the first main reinforcing rib (201) and the fourth main reinforcing rib (204).

10. The rear longitudinal beam according to claim 9, wherein, The main reinforcement rib (2), the first peripheral reinforcement rib (3), the second peripheral reinforcement rib (4) and the auxiliary reinforcement rib (5) are integrally die-cast on the rear longitudinal beam body (1) by aluminum alloy.

11. The rear longitudinal beam according to any one of claims 5 to 10, further comprising a plurality of auxiliary reinforcement ribs (6) arranged between the first peripheral reinforcement rib (3) and the second peripheral reinforcement rib (4), the plurality of auxiliary reinforcement ribs (6) being connected to the first peripheral reinforcement rib (3) and / or the second peripheral reinforcement rib (4). The plurality of auxiliary reinforcement ribs (6) are arranged alternately.

12. A rear floor assembly comprising the rear longitudinal beam according to any one of claims 1 to 11, The two rear longitudinal beams are arranged on the left and right sides of the rear floor assembly, and the impact force generated when the rear floor assembly is impacted is transmitted to the rear longitudinal beams.

13. A vehicle comprising: a tire; the rear floor assembly according to claim 12, the degree of curvature of the first curved section (101) of the rear longitudinal beam corresponding to the outer contour of the tire.

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