A vehicle front end protection device

Abstract

The application provides a vehicle front end protection device, comprising: a front cross beam assembly comprising a front cross beam, energy absorption boxes fixed on the left and right sides of the front cross beam respectively, and front cross beam end plates fixed at the rear ends of the energy absorption boxes; a front longitudinal beam assembly comprising front longitudinal beam assemblies connected at the rear ends of the front cross beam end plates respectively, wherein the front longitudinal beam assembly comprises a front longitudinal beam front end plate, a front longitudinal beam, an energy absorption box support beam and an energy absorption box support frame, the front longitudinal beam front end plate is connected with the front cross beam end plate, the front longitudinal beam is fixedly connected with the front longitudinal beam front end plate, the energy absorption box support beam is fixedly connected with the front longitudinal beam front end plate through the energy absorption box support frame and is fixedly connected with the front longitudinal beam, and a gap is arranged between the energy absorption box support beam and the front longitudinal beam front end plate. The application solves the problem that the current heavy vehicle with a short front end is difficult to meet the high requirement safety collision regulations.

Description

Technical Field

[0001] This application relates to the field of vehicle collision avoidance technology, and more specifically, to a vehicle front-end protection device. Background Technology

[0002] Currently, automotive design faces increasingly stringent safety and collision regulations. Increased vehicle weight due to users' growing demand for multi-functionality, and a more compact engine compartment layout resulting from shorter front overhangs and longer wheelbases, all contribute to a shrinking front-end deformation and energy-absorbing space. This necessitates that the front-end structure absorb more energy within this limited space. Consequently, higher demands are being placed on the energy-absorbing deformation mechanisms of the front of the vehicle.

[0003] The front-end protection structure in related technologies has poor impact resistance and energy absorption, making it difficult to protect occupants. Summary of the Invention

[0004] The purpose of this application is to provide a vehicle front-end protection device that can solve at least one of the aforementioned technical problems. The specific solution is as follows:

[0005] According to a specific embodiment of this application, in a first aspect, this application provides a vehicle front-end protection device, comprising: a front crossbeam assembly, including a front crossbeam, energy-absorbing boxes respectively fixed to the left and right sides of the front crossbeam, and a front crossbeam end plate fixed to the rear end of each energy-absorbing box; and a front longitudinal beam assembly, including a front longitudinal beam component correspondingly connected to the rear end of each front crossbeam end plate, the front longitudinal beam component including a front longitudinal beam front end plate, a front longitudinal beam, an energy-absorbing box support beam, and an energy-absorbing box support frame, the front longitudinal beam front end plate being connected to the front crossbeam end plate, the front longitudinal beam being fixedly connected to the front longitudinal beam front end plate, the energy-absorbing box support beam being fixedly connected to the front longitudinal beam front end plate and the front longitudinal beam through the energy-absorbing box support frame, and a gap being provided between the energy-absorbing box support beam and the front longitudinal beam front end plate.

[0006] In some embodiments, the front longitudinal beam includes a front section of the longitudinal beam, the cavity of the front section of the front longitudinal beam constitutes a first energy-absorbing zone, the lower part of the energy-absorbing box support beam is connected to the side wall of the front section of the front longitudinal beam and together with the cavity formed therein constitutes a second energy-absorbing zone, the fixed position of the energy-absorbing box support frame and the front end plate of the front longitudinal beam corresponds to the edge of the energy-absorbing box, and the front end plate of the front longitudinal beam, the energy-absorbing box support frame, the energy-absorbing box support beam, and the side wall of the front section of the front longitudinal beam together constitute a third energy-absorbing zone.

[0007] In some embodiments, the front section of the front longitudinal beam is fixedly connected to the front end plate of the front longitudinal beam via an annular front end plate extension plate, and the annular front end plate extension plate is fixed to the front end of the front longitudinal beam.

[0008] In some embodiments, at least the front portion width of the front section cavity of the front longitudinal beam is adapted to the width of the energy-absorbing box; or, at least the front portion width of the front section cavity of the front longitudinal beam, the width of the energy-absorbing box, and the width of the front crossbeam are all adapted to each other.

[0009] In some embodiments, the front longitudinal beam further includes a middle section of the longitudinal beam and a rear section of the longitudinal beam;

[0010] Among them, the front crossbeam assembly, the energy-absorbing box support beam, the energy-absorbing box support frame, and the front section of the front longitudinal beam together constitute the front axial crushing energy-absorbing zone;

[0011] The cavity in the middle section of the front longitudinal beam forms a bending deformation energy absorption zone, and the cavity in the rear section of the front longitudinal beam forms a deformation resistance zone.

[0012] In some embodiments, the cavity width of the middle section of the front longitudinal beam is smaller than the cavity width of the front section of the front longitudinal beam and the cavity width of the rear section of the front longitudinal beam.

[0013] In some embodiments, the cavity width of the middle section of the front longitudinal beam gradually increases from front to rear; and / or, the cavity width of the rear section of the front longitudinal beam gradually increases from front to rear.

[0014] In some embodiments, the front section of the front longitudinal beam is provided with guide concave ribs, or the front section of the front longitudinal beam is provided with guide concave ribs that are staggered along the front-rear direction to guide the deformation trend of the direction; and / or, the two opposite sides of the middle section of the front longitudinal beam are respectively provided with guide concave ribs and guide convex ribs, the guide concave ribs and the guide convex ribs being located at the minimum position of the cavity width of the middle section of the front longitudinal beam; and / or, the rear section of the front longitudinal beam is provided with diagonal ribs in the direction of resisting deformation.

[0015] In some embodiments, the middle section of the front longitudinal beam and the rear section of the front longitudinal beam are an integral structure, the front section of the front longitudinal beam is fixedly connected to the middle section of the front longitudinal beam, and a first support partition is provided in the middle section of the front longitudinal beam adjacent to the fixed connection position between the front section of the longitudinal beam and the middle section of the front longitudinal beam, all edges of the first support partition being fixedly connected to the inner wall of the middle section of the front longitudinal beam; and / or, a second support partition is provided in the rear section of the front longitudinal beam adjacent to the rear section of the front longitudinal beam, and a gap exists between one edge of the second support partition and the rear section of the front longitudinal beam; and / or, a reinforcing plate is provided in the rear section of the front longitudinal beam, and two edges of the reinforcing plate are fixedly connected to two adjacent sides of the rear section of the front longitudinal beam.

[0016] In some embodiments, the front longitudinal beam end plate has a flange; and / or, the front longitudinal beam end plate is fixedly connected to the front cross beam end plate by fasteners; and / or, one end of the energy-absorbing box support frame is connected to the front longitudinal beam end plate by fasteners, and the other end is connected to the energy-absorbing box support beam by fasteners.

[0017] Compared with the prior art, the above-described solutions of this application have at least the following beneficial effects:

[0018] (1) By adding the front longitudinal beam front end plate and the energy-absorbing box support beam, the front energy-absorbing box can be held in place during the collision, thereby controlling the axial crush deformation area of ​​the front longitudinal beam front end and improving the stability of the axial crush deformation of the front longitudinal beam front end. This results in stable crush energy absorption between the front bumper crossbeam and the front section of the front longitudinal beam, improving the impact resistance and energy absorption effect. A gap is reserved between the energy-absorbing box support beam and the front longitudinal beam end plate, so that the energy-absorbing box support beam is only connected to the front longitudinal beam and not to the front longitudinal beam end plate, leaving welding space between the energy-absorbing box support beam and the outer plate of the longitudinal beam. In this way, the axial relative position of the front longitudinal beam and the front longitudinal beam end plate can be adjusted during installation. Since the fasteners on the front longitudinal beam end plate have a gap matching relationship with the outside, the adjustable axial gap of the longitudinal beam can greatly reduce the difficulty of process matching and realize a front end structure that is easy to implement.

[0019] (2) The superposition of the energy-absorbing areas and the joint formation of the energy-absorbing areas support and absorb energy for the energy-absorbing box, stabilizing the crushing deformation of the energy-absorbing area. An additional support bracket is added between the rear part of the front longitudinal beam plate and the support beam of the energy-absorbing box. The front support position of the support bracket corresponds to the edge of the energy-absorbing box. The width of the front support position of the support bracket is consistent with the outer width of the front energy-absorbing box, which can further stabilize the crushing deformation trend of the energy-absorbing area.

[0020] (3) Three areas along the collision path: the high-efficiency axial crushing energy absorption zone at the foremost point, the bending crushing energy absorption zone in the middle section, and the deformation-resistant zone at the rear of the front longitudinal beam. This solves the problem of large-mass vehicles not achieving a C-NCAP five-star rating. At the same time, since the end plates and support beams are not welded, the process matching can be adjusted by changing the welding position of the end plates, solving the problem of unreliable appearance gaps and meeting the DTS requirements of the whole vehicle.

[0021] (4) The middle section of the front longitudinal beam is structurally modified to induce bending deformation, allowing it to continue absorbing energy. The rear section of the front longitudinal beam is structurally reinforced to resist deformation and protect the safety of the occupants. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of a vehicle front-end protection device according to an embodiment of this application is shown;

[0023] Figure 2 A diagram showing the distribution of the energy-absorbing area of ​​a vehicle front-end protection device according to an embodiment of this application is provided.

[0024] Figure 3 A partially exploded view of a vehicle front-end protection device according to an embodiment of this application is shown;

[0025] Figure 4A schematic diagram of the front axial crush zone structure of a vehicle front protection device according to an embodiment of this application is shown;

[0026] Figure 5 A schematic diagram of the bending energy absorption zone and the non-deformation resistance zone of the vehicle front-end protection device according to an embodiment of this application is shown.

[0027] Figure 6 A schematic cross-sectional view of the front axial crush zone of a vehicle front protection device according to an embodiment of this application is shown.

[0028] Figure 7 A cross-sectional schematic diagram of the bending energy absorption zone and the non-deformation resistance zone of the vehicle front-end protection device according to an embodiment of this application is shown. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0031] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0032] It should be understood that although the terms first, second, third, etc., may be used in the embodiments of this application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, first may also be referred to as second without departing from the scope of the embodiments of this application, and similarly, second may also be referred to as first.

[0033] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0034] It should be noted that any symbols and / or numbers present in the specification that are not marked in the accompanying drawings are not reference numerals.

[0035] The optional embodiments of this application are described in detail below with reference to the accompanying drawings.

[0036] The embodiments provided in this application are embodiments of a vehicle front-end protection device.

[0037] The following is combined Figures 1-7 The embodiments of this application will be described in detail.

[0038] This application provides a vehicle front-end protection device, including: a front crossbeam assembly A and a front longitudinal beam assembly B.

[0039] The front crossbeam assembly A includes a front crossbeam 1, energy-absorbing boxes 2 fixed on the left and right sides of the front crossbeam 1 respectively, and a front crossbeam end plate 3 fixed at the rear end of each energy-absorbing box 2.

[0040] The front longitudinal beam assembly B includes a front longitudinal beam component correspondingly connected to the rear end of each front crossbeam end plate 3. The front longitudinal beam component includes a front longitudinal beam front end plate 4, a front longitudinal beam 67, an energy-absorbing box support beam 890, and an energy-absorbing box support frame 11. The front longitudinal beam front end plate 4 is connected to the front crossbeam end plate 3, the front longitudinal beam 67 is fixedly connected to the front longitudinal beam front end plate 4, and the energy-absorbing box support beam 890 is fixedly connected to the front longitudinal beam front end plate 4 and the front longitudinal beam 67 through the energy-absorbing box support frame 11. A gap is provided between the energy-absorbing box support beam 890 and the front longitudinal beam front end plate 4.

[0041] In the above technical solution, the front crossbeam assembly A, the energy-absorbing box support beam 890, the energy-absorbing box support frame 11, and the front section of the front longitudinal beam 67 together constitute the front axial crushing energy-absorbing zone I. By adding the front end plate 4 of the front longitudinal beam and the energy-absorbing box support beam 890, the front energy-absorbing box 2 can be held in place during the collision, thereby controlling the axial crushing deformation area at the front end of the front longitudinal beam, improving the stability of the axial crushing deformation at the front end of the front longitudinal beam, and enabling the front bumper crossbeam and the front section of the front longitudinal beam to generate stable crushing energy absorption, thus improving the impact resistance and energy absorption effect. A gap is reserved between the energy-absorbing box support beam 890 and the front longitudinal beam end plate 4, so that the energy-absorbing box support beam 890 is only connected to the front longitudinal beam 67 and not to the front longitudinal beam end plate 4. This leaves space for welding between the energy-absorbing box support beam 890 and the outer plate of the longitudinal beam. In this way, the relative position of the front longitudinal beam 4 and the front longitudinal beam end plate 4 axis can be adjusted during installation. Since the fasteners on the front longitudinal beam end plate 4 have a gap matching relationship with the outside, the adjustable gap of the longitudinal beam axis can greatly reduce the difficulty of process matching and realize a front-end structure that is easy to implement.

[0042] In one example, the front section of the longitudinal beam is fixedly connected to the front end plate 4 of the front longitudinal beam via an annular front end plate extension plate 5, and the annular front end plate extension plate 5 is fixed to the front end of the front longitudinal beam 67.

[0043] In some embodiments, the longitudinal beam 67 includes a front section, the cavity of which constitutes a first energy-absorbing region E1 (see...). Figure 6 The lower part of the energy-absorbing box support beam 890 is connected to the side wall of the front section of the longitudinal beam and together with the cavity formed, constitutes the second energy-absorbing zone E2 (see...). Figure 6 The fixed positions of the energy-absorbing box support frame 11 and the front longitudinal beam front end plate 4 correspond to the edge of the energy-absorbing box 2. The front longitudinal beam front end plate 4, the energy-absorbing box support frame 11, the energy-absorbing box support beam 890, and the side wall of the front section of the longitudinal beam together constitute the third energy-absorbing zone E3 (see...). Figure 6 ).

[0044] In the above technical solution, the superposition of energy-absorbing region E3 and energy-absorbing region E1, together with energy-absorbing region E2, forms support and energy absorption for energy-absorbing box 2, stabilizing the crushing deformation of the energy-absorbing region. An additional support bracket 11 is added between the rear of the front longitudinal beam front end plate 4 and the energy-absorbing box support beam 890. The front support position of the support bracket 11 corresponds to the edge of the energy-absorbing box 2, meaning that the width of the front support position of the support bracket 11 is consistent with the outer width of the front energy-absorbing box 2, which can further stabilize the crushing deformation trend of the energy-absorbing region.

[0045] In some embodiments, the front longitudinal beam 67 includes a front section, a middle section, and a rear section. The cavity of the middle section forms a bending deformation energy absorption zone II, and the cavity of the rear section forms a deformation resistance zone III.

[0046] The system comprises three zones along the collision path: the high-efficiency axial crushing energy absorption zone I at the very front, the bending crushing energy absorption zone II in the middle, and the deformation-resistant zone III at the rear of the front longitudinal beam. This design solves the problem of achieving a five-star C-NCAP rating for large vehicles. Furthermore, since the end plates are not welded to the support beams, the welding position of the end plates can be adjusted to ensure process matching, resolving the issue of unreliable appearance clearances and meeting the overall vehicle DTS requirements.

[0047] For example, the middle section and the rear section of the longitudinal beam can be an integral structure, while the front section and the middle section of the longitudinal beam can be welded together.

[0048] In some embodiments, at least the front portion width of the longitudinal beam front section cavity is adapted to the width of the energy-absorbing box 3, for example, they can be the same; or, at least the front portion width of the longitudinal beam front section cavity, the width of the energy-absorbing box 3, and the width of the front crossbeam 1 are all adapted to each other, for example, they can be the same.

[0049] During a collision, the front section is the main energy absorption zone. The width of at least the front part of the longitudinal beam cavity, the width of the energy absorption box 3, and the width of the front crossbeam 1 are matched to improve the impact resistance and energy absorption effect.

[0050] In some embodiments, the cavity width of the middle section of the longitudinal beam is smaller than the cavity width of the front section of the longitudinal beam and the cavity width of the rear section of the longitudinal beam.

[0051] The cavity width in the middle section of the longitudinal beam gradually increases from front to back; and / or, the cavity width in the rear section of the longitudinal beam gradually increases from front to back.

[0052] Specifically, the aforementioned front crossbeam 1 and front energy-absorbing box 2 are welded together around the entire perimeter of the front energy-absorbing box 2 to form a weld. This weld is a closed loop, avoiding quality defects and stress changes caused by weld breaks. The front energy-absorbing box 2 is also welded to the front crossbeam end plate 3 around its entire perimeter, resulting in a highly stable structure.

[0053] The front longitudinal beam front end plate 4 is welded to the front end plate extension plate 5 at a full circumference using laser fusion welding. The front end plate extension plate 5 is connected end to end by a serrated pressing process.

[0054] The front section 6-1 of the first front longitudinal beam and the front section 7-1 of the second front longitudinal beam are connected to form a cavity by upper and lower welding edges, and are welded to the closed structure inserted into the front end plate extension plate 5.

[0055] The energy-absorbing box support beam 890 includes a side support beam 8, a support beam reinforcing plate 9, and a side support beam sealing plate 10. The side support beam 8 and the side support beam reinforcing plate 9 are welded together to form a U-shaped cavity. The upper and lower parts of the U-shaped cavity are connected to the side support beam sealing plate 10 and the front section 7-1 of the second front longitudinal beam, respectively. The side support beam 8 is provided with mounting holes and is screwed to the energy-absorbing box support bracket 11. At the same time, the front end of the energy-absorbing box support bracket 11 is screwed to the front end plate 4 of the front longitudinal beam.

[0056] The front section 6-1 of front longitudinal beam No. 1 and the middle and rear section 6-2 of front longitudinal beam No. 1 are connected by laser welding, and the front section 7-1 of front longitudinal beam No. 2 and the middle and rear section 7-2 of front longitudinal beam No. 2 are also connected by laser welding.

[0057] The rear section 6-2 of the front longitudinal beam is provided with a first support partition 12, all edges of which are fixedly connected to the inner wall of the middle section of the longitudinal beam; and / or, a second support partition 13 is provided in the rear section of the longitudinal beam adjacent to the rear section of the front longitudinal beam, with a gap between one edge of the second support partition and the rear section of the longitudinal beam. and / or, a reinforcing plate 14 is provided in the rear section of the longitudinal beam, with two edges of the reinforcing plate fixedly connected to two adjacent sides of the rear section of the longitudinal beam.

[0058] For example, three mating surfaces of the first support partition 12 are connected to the middle and rear section 6-2 of the first front longitudinal beam, and the fourth mating surface is connected to the middle and rear section 7-2 of the second front longitudinal beam by MIG welding. A second support partition 13 is provided inside the middle and rear section 6-2 of the first front longitudinal beam. Three mating surfaces of the second support partition 13 are connected to the middle and rear section 6-2 of the first front longitudinal beam, and there is a certain gap between it and the middle and rear section 7-2 of the second front longitudinal beam. The reinforcing plate 14 is connected to the middle and rear section 6-2 of the first front longitudinal beam through two boundary points.

[0059] The front crossbeam 1 has a hollow cavity structure 1a, with extended lengths at both ends, increasing its energy absorption area. Energy-absorbing boxes 2 are located behind both sides of the front crossbeam 1. The front energy-absorbing boxes 2 are seamlessly welded to the front crossbeam 1, ensuring a reliable and stable connection that minimizes stress concentration caused by sudden weld breaks. The width of the front energy-absorbing boxes 2 is increased by 40%–50%, increasing the energy absorption area of ​​the collision zone and maximizing energy absorption. The energy-absorbing boxes 2 are symmetrically positioned on both sides of the vehicle, ensuring uniform energy transfer. Furthermore, each energy-absorbing box 2 has a crumple guide groove on both its inner and outer sides, with crush guide ribs 2a on the outer side and crush guide ribs 2b and 2c on the inner side. During a collision, these ribs induce the entire front bumper energy-absorbing box 2 to crush along the guide grooves, creating a pleated crushing effect for optimal energy absorption. The front crossbeam assembly A is connected to the front longitudinal beam end plates 4 via its left and right sides. The front longitudinal beam end plates 4 are connected to the front section of the front longitudinal beam, transferring remaining energy to the front longitudinal beam assembly B.

[0060] The front longitudinal beam section B consists of front longitudinal beam section 6-1 (first section), front longitudinal beam section 7-1 (second section), front longitudinal beam front end plate 4, and end plate extension plate 5. The end plate extension plate 5 forms a ring structure, self-pressurized end-to-end, and is arranged perpendicularly to the front longitudinal beam end plate, joined to it via laser welding. The front longitudinal beam end plate 4 has a small flange limiting structure 4a to enhance structural stability, and also features reinforcing ribs 4b to improve structural rigidity. The end plate extension plate 5 has a certain width, allowing for double-row welding connections with the inner and outer plates of the front longitudinal beam, improving connection stability under collision conditions.

[0061] The front section 7-1 of the second front longitudinal beam is set to be as close to the outside of the vehicle as possible in the Y direction, so that the front end cavity of the front longitudinal beam is widened and the energy absorption cavity E1 is increased, which corresponds to the width of the energy absorption box 2 of the front bumper.

[0062] The front section 6-1 of the first longitudinal beam is provided with collapsible guide ribs 6-1b and 6-1c. The stamped fillet of the front section 6-1 of the first longitudinal beam is also provided with an indentation 6-1a to guide the deformation trend. The ribs and indentations are arranged alternately to induce the deformation trend.

[0063] The front section 7-1 of the second front longitudinal beam is also provided with a collapsible guide rib 7-1a. The front section 7-1 of the second front longitudinal beam is connected to the front section 6-1 of the first front longitudinal beam through two welded edges to form cavity E1.

[0064] A side support beam 8 and a side support beam reinforcing plate 9 are provided on the outer side of the front longitudinal beam outer plate. The side support beam 8 and the side support beam reinforcing plate 9 first form a U-shaped cavity. The lower part forms a square cavity E2 with the front longitudinal beam outer plate. The upper part is added with a side support beam sealing plate, which also forms a square cavity. The structure is stable and can increase the overall energy absorption size of the front longitudinal beam in the cavity space on the outer side of the front longitudinal beam. By reasonably setting the position of the side support beam assembly and the cavity size E2, the energy absorption capacity can be improved, and at the same time, it provides support for the energy absorption area of ​​the front energy absorption box 2.

[0065] Meanwhile, a gap is reserved between the side support beam 8 and the front end plate 4 of the front longitudinal beam, so that the side support beam 8 can be welded to the front section 7-1 of the second front longitudinal beam, avoiding welding to the front end plate 4 of the front longitudinal beam. This leaves welding space between the side support beam 8 and the front section 7-1 of the second front longitudinal beam. In this way, the front end plate 4 of the front longitudinal beam can be adjusted in axial relative position with the front longitudinal beam assembly through tolerance requirements during the welding process. Since the fasteners on the front end plate 4 of the front longitudinal beam have a gap matching relationship with the outside of the vehicle, the adjustable axial gap of the longitudinal beam can greatly reduce the difficulty of process matching and realize a front end structure that is easy to implement.

[0066] To further stabilize the crushing deformation trend of the energy-absorbing area, an additional support bracket 11 was added between the rear of the front longitudinal beam plate 4 and the side support beam 8. The width of the front support position of the support bracket 11 is consistent with the outer width of the front energy-absorbing box 2, and they are connected by bolts and nuts of L5 and L6. The rear of the energy-absorbing box support bracket 11 is connected to the lower part of the side support beam 8 by bolts and nuts of L7 and L8.

[0067] The energy-absorbing box support bracket 11, side support beam 8, front section 7-1 of the second front longitudinal beam, and front end plate 4 of the front longitudinal beam constitute the energy-absorbing area E3. This energy-absorbing area E3, together with the energy-absorbing area E1 formed by the front sections 6-1 and 6-2 of the first and second front longitudinal beams, and the energy-absorbing area E2 formed by the side support beam 8, the side support beam reinforcing plate 9, and the front section 7-1 of the second front longitudinal beam, together form the energy-absorbing area of ​​the energy-absorbing box 2 supported by the front safety crossbeam, stabilizing the crushing deformation of the energy-absorbing area. The energy-absorbing box support bracket 11 has a reasonable material thickness and an added axial resistance deformation rib structure 10a to avoid bending and collapse, and stabilize the force transmission path.

[0068] In this invention, the middle section of the front longitudinal beam assembly is designated as the bending collapse energy absorption zone II, which continues to absorb energy. The front section 6-1 of the first front longitudinal beam and the middle and rear section 6-2 of the first front longitudinal beam, as well as the front section 7-1 of the second front longitudinal beam and the middle and rear section 7-2 of the outer front longitudinal plate, are laser-welded together. The material thickness and structural settings serve as the initial dividing line between the energy-absorbing front section and the middle section.

[0069] The closed U-shaped cavity formed by the middle and rear sections 6-2 of front longitudinal beam 1 and 7-2 of front longitudinal beam 2 gradually narrows in the middle section and then gradually widens again, forming the narrowest cavity position h. Simultaneously, at the narrowest part, the middle and rear section 6-2 of front longitudinal beam 1 has guide concave ribs 6-2c, 6-2d, and 6-2e, and the middle and rear section 7-2 of front longitudinal beam 2 has guide convex ribs 7-2a, 7-2b, and 7-2c. These concave and convex ribs are positioned side-by-side to obstruct energy transmission, causing a bend at the narrowest position h, preventing further energy transfer and achieving energy absorption after bending. To ensure stability, the transition between the front and middle sections is smooth, as is the transition between the middle and rear sections. Furthermore, a first support partition 12 and a second support partition 13 are added between the middle and rear sections 6-2 of front longitudinal beam 1 and 7-2 of front longitudinal beam 2 to prevent premature bending or bending failure, thus stabilizing the energy transmission pattern.

[0070] The rear section of the front longitudinal beam assembly is close to the passenger compartment and is required to have a certain resistance to deformation to protect the safety of the passengers. The distance between the middle and rear sections 6-2 of the first front longitudinal beam and 7-2 of the second front longitudinal beam is uniformly increased compared to the middle section area. The middle and rear sections 7-2 of the second front longitudinal beam are provided with diagonal ribs 7-2e, 7-2f, and 7-2g to resist deformation in the direction of deformation, further preventing deformation of the rear section. A reinforcing bracket is provided at the root of the front longitudinal beam assembly, which provides an installation point for the rear point of the front subframe and also strengthens the root of the longitudinal beam. Furthermore, a reinforcing plate 14 is provided inside the rear section area of ​​the front longitudinal beam to increase the reliability of the deformation-resistant area.

[0071] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A vehicle front end protection device characterized by comprising: Comprise: The front beam assembly comprises a front beam (1), an energy absorption box (2) fixed on the left and right sides of the front beam respectively, and a front beam end plate (3) fixed at the rear end of each energy absorption box; The front longitudinal beam assembly (B) comprises a front longitudinal beam assembly connected to the rear end of each front beam end plate (3), the front longitudinal beam assembly comprises a front longitudinal beam front end plate (4), a front longitudinal beam (67), an energy absorption box support beam and an energy absorption box support bracket (11), the front longitudinal beam front end plate (4) is connected with the front beam end plate (3), the front longitudinal beam is fixedly connected with the front longitudinal beam front end plate (4), the energy absorption box support beam is fixedly connected with the front longitudinal beam front end plate (4) through the energy absorption box support bracket (11) and is fixedly connected with the front longitudinal beam, and a gap is arranged between the energy absorption box support beam and the front longitudinal beam front end plate (4); The front longitudinal beam comprises a longitudinal beam front section, a cavity of the front longitudinal beam front section constitutes a first energy absorption area, a lower part of the energy absorption box support beam is connected with a side wall of the front longitudinal beam front section and a cavity formed together constitutes a second energy absorption area, a fixed position of the energy absorption box support bracket (11) and the front longitudinal beam front end plate (4) corresponds to an edge of the energy absorption box (2), and the front longitudinal beam front end plate (4), the energy absorption box support bracket (11), the energy absorption box support beam and the side wall of the front longitudinal beam front section jointly constitute a third energy absorption area.

2. The vehicle front end protection device according to claim 1, wherein The front longitudinal beam front section is fixedly connected with the front longitudinal beam front end plate (4) through a ring-shaped front end plate extension plate (5), and the ring-shaped front end plate extension plate (5) is fixed at the front end of the front longitudinal beam.

3. The vehicle front end protection device according to claim 1, wherein At least a front part width of the front longitudinal beam front section cavity is matched with the width of the energy absorption box, or the width of the front longitudinal beam (1) is matched with the width of the energy absorption box.

4. The vehicle front end protection device according to any one of claims 1-3, wherein The front longitudinal beam further comprises a longitudinal beam middle section and a longitudinal beam rear section; The front beam assembly (A), the energy absorption box support beam, the energy absorption box support bracket (11) and the front longitudinal beam front section jointly constitute a front section axial crushing energy absorption area (I); A cavity of the front longitudinal beam middle section constitutes a bending deformation energy absorption area, and a cavity of the front longitudinal beam rear section constitutes a deformation resistance area.

5. The vehicle front end protection device according to claim 4, wherein The cavity width of the front longitudinal beam middle section is smaller than the width of the front longitudinal beam front section cavity and the width of the front longitudinal beam rear section cavity.

6. The vehicle front end protection device according to claim 5, wherein The cavity width of the front longitudinal beam middle section gradually increases from front to back; and / or The cavity width of the front longitudinal beam rear section gradually increases from front to back.

7. The vehicle front end protection device according to claim 4, wherein The front section of the front longitudinal beam is provided with a guide concave rib, or the front section of the front longitudinal beam is provided with guide concave ribs staggered in the front-rear direction to guide the indentation (6-1a) of the deformation trend in the direction; And / or, The opposite two sides of the middle section of the front longitudinal beam are respectively provided with a guide concave rib and a guide convex rib (7-2b), and the guide concave rib and the guide convex rib (7-2b) are located at the position where the cavity width of the middle section of the front longitudinal beam is the smallest; And / or, The rear section of the front longitudinal beam is provided with anti-deformation direction inclined ribs (7-2e, 7-2f, 7-2g).

8. The vehicle front end protection device according to claim 4, characterized in that, The middle section of the front longitudinal beam and the rear section of the front longitudinal beam are an integral structure, the front section of the front longitudinal beam is fixedly connected with the middle section of the front longitudinal beam, the first support partition plate (12) is arranged in the middle section of the front longitudinal beam adjacent to the position where the front section of the longitudinal beam is fixedly connected with the middle section of the front longitudinal beam, and all edges of the first support partition plate (12) are fixedly connected with the inner wall of the middle section of the front longitudinal beam; And / or, The second support partition plate (13) is arranged in the middle-rear section of the front longitudinal beam adjacent to the rear section of the front longitudinal beam, and one edge of the second support partition plate has a gap with the middle-rear section of the front longitudinal beam; And / or, The rear section of the front longitudinal beam is provided with a reinforcing plate (14), and two edges of the reinforcing plate are fixedly connected with two adjacent edges of the rear section of the front longitudinal beam.

9. The vehicle front end protection device according to claim 1, characterized in that, The front end plate (4) of the front longitudinal beam has a flange; And / or, The front end plate (4) of the front longitudinal beam is fixedly connected with the end plate (3) of the front transverse beam through fasteners; And / or, One end of the energy absorption box support frame (11) is connected with the front end plate (4) of the front longitudinal beam through fasteners, and the other end is connected with the energy absorption box support beam through fasteners.

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