Cross beam reinforcing structure, vehicle body cross beam and vehicle

Abstract

The utility model provides a cross beam reinforcing structure, a vehicle body cross beam and a vehicle, the cross beam reinforcing structure comprises a cross beam reinforcing piece body arranged on the vehicle body cross beam and a connecting support connected between a doorsill beam inner plate and the cross beam reinforcing piece body, and the cross beam reinforcing piece body is provided with a first connecting piece. A second connecting piece is arranged on the connecting support and connected with the first connecting piece. The safety performance of the vehicle body cross beam is improved, and the structural performance and the connection stability of the cross beam reinforcing structure and the collision safety of the whole vehicle are guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle parts, and in particular relates to a crossbeam reinforcement structure, a vehicle body crossbeam and a vehicle. Background Art

[0002] At present, with the upgrade of collision safety regulations, the addition of pillar collision requirements has made the design of the body beam structure more difficult. In the existing technology, when dealing with side collision and pillar collision conditions, the impact resistance of the body beam structure is generally not high, and the deformation is large, which threatens the occupant's survival space and the battery pack's safety space. In the related technology, there is a solution of welding reinforcements made of sheet metal materials to improve the structural safety of the body beam, but this solution will increase the weight of the body structure, which is not conducive to the lightweight design of the body. Utility Model Content

[0003] The utility model aims at the technical problems existing in the prior art and provides a crossbeam reinforcement structure, a vehicle body crossbeam and a vehicle.

[0004] In view of the above technical problems, an embodiment of the utility model provides a crossbeam reinforcement structure, including a crossbeam reinforcement body arranged on the crossbeam of the vehicle body and a connecting bracket connected between the inner plate of the sill beam and the crossbeam reinforcement body, wherein a first connecting member is arranged on the crossbeam reinforcement body, and a second connecting member is arranged on the connecting bracket, and the second connecting member is connected to the first connecting member.

[0005] Optionally, the connecting bracket includes an energy absorption box; the energy absorption box includes a box body having an energy absorption cavity and connected to the second connecting member, and at least one first reinforcement rib spaced apart in the energy absorption cavity; the first reinforcement rib is parallel to the length direction of the beam reinforcement body.

[0006] Optionally, the crossbeam reinforcement structure further includes a first structural adhesive layer, and the second connecting member and the first connecting member are bonded to each other via the first structural adhesive layer.

[0007] Optionally, a hollow cavity is further provided on the cross-beam reinforcement body; the cross-beam reinforcement body includes a second reinforcement rib arranged in the hollow cavity, and the second reinforcement rib is parallel to the length direction of the cross-beam reinforcement body.

[0008] Optionally, the crossbeam reinforcement body is a pultruded structural member made of continuous glass fiber reinforced polyurethane, and the connecting bracket is an injection molded structural member made of glass fiber reinforced polyamide.

[0009] Optionally, the first connecting member is a mortise; and the second connecting member is a tenon.

[0010] Optionally, the first connecting member is a tenon; and the second connecting member is a mortise.

[0011] The embodiment of the utility model also provides a vehicle body cross beam, including the cross beam reinforcement structure.

[0012] Optionally, a clamping piece is provided on the connecting bracket, and the vehicle body cross beam includes a cross beam body provided with a clamping hole; the connecting bracket is installed on the cross beam body by means of the clamping piece and the clamping hole being clamped to each other.

[0013] The utility model also provides a vehicle, comprising a front floor, a sill beam inner plate fixedly connected to opposite sides of the front floor, and the vehicle body cross beam; the vehicle body cross beam is installed on the front floor.

[0014] Optionally, the vehicle further comprises a shock-absorbing rubber layer disposed between the cross-beam reinforcement body and the front floor, and the cross-beam reinforcement body is bonded to the front floor via the shock-absorbing rubber layer.

[0015] Optionally, the vehicle further comprises a second structural adhesive layer covered on the connecting bracket, and the connecting bracket is bonded to the sill beam inner plate and the front floor through the second structural adhesive layer.

[0016] In the utility model, the crossbeam reinforcement structure includes a crossbeam reinforcement body arranged on the vehicle body crossbeam and a connecting bracket connected between the sill beam inner plate and the crossbeam reinforcement body, so that the crossbeam reinforcement body can enhance the structural strength of the vehicle body crossbeam and improve the safety performance of the vehicle body crossbeam; at the same time, a first connecting member is arranged on the crossbeam reinforcement body, and a second connecting member is arranged on the connecting bracket, and the second connecting member is connected to the first connecting member. In this way, while ensuring the structural performance and connection stability of the crossbeam reinforcement structure, the impact force of the collision can be better transmitted to the crossbeam reinforcement body with higher compressive strength through the first connecting member and the second connecting member, and then the intrusion amount under side collision and pillar collision conditions is reduced through the crossbeam reinforcement body, thereby ensuring the collision safety of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of a vehicle body cross beam provided by an embodiment of the utility model.

[0019] Figure 2 It is a structural schematic diagram of a crossbeam reinforcement structure provided by an embodiment of the utility model.

[0020] Figure 3 It is a structural schematic diagram of an energy absorption box provided in one embodiment of the utility model.

[0021] Figure 4 It is a structural schematic diagram of a crossbeam reinforcement body provided by an embodiment of the utility model.

[0022] The reference numerals in the specification are as follows:

[0023] 1-body cross beam, 110-clamping hole, 120-cross beam body, 2-cross beam reinforcement structure, 21-cross beam reinforcement body, 211-first connecting piece, 212-hollow cavity, 213-second reinforcing rib, 22-connecting bracket, 221-energy absorption box, 2211-box body, 2212-first reinforcing rib, 222-second connecting piece, 223-clamping piece, 3-first structural adhesive layer, 4-second structural adhesive layer, 5-front floor, 6-shock-absorbing adhesive layer, 7-sill beam inner plate. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0025] It should be understood that the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "rear", and "middle" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the vehicle or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation of the present invention.

[0026] like Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a crossbeam reinforcement structure 2, including a crossbeam reinforcement body 21 arranged on the vehicle body crossbeam 1 and a connecting bracket 22 connected between the sill beam inner plate 7 and the crossbeam reinforcement body 21, the crossbeam reinforcement body 21 is provided with a first connecting member 211, the connecting bracket 22 is provided with a second connecting member 222, and the second connecting member 211 is connected to the first connecting member 222.

[0027] In a further embodiment, the first connecting member 211 is a mortise; the second connecting member 222 is a tenon; in this case, the tenon fits the mortise, and the second connecting member 222 is inserted as a tenon into the first connecting member 211 as a tenon, so that the connecting bracket 22 and the beam reinforcement body 21 are connected by a tenon and a mortise. In another embodiment, the first connecting member 211 is a tenon; the second connecting member 222 is a mortise, and in this case, the first connecting member 211 is inserted as a tenon into the second connecting member 222 as a mortise, so that the connecting bracket 22 and the beam reinforcement body 21 are connected by a tenon and a mortise.

[0028] In this embodiment, the above-mentioned crossbeam reinforcement body 21 and the connecting bracket 22 are connected by the second connecting member 211 and the first connecting member 222 to form a crossbeam reinforcement structure 2, which can better exert the mechanical properties of the reinforcement 2, enhance the structural strength of the vehicle body crossbeam 1, and thus ensure the structural performance and connection stability of the crossbeam reinforcement structure; and, through the first connecting member 211 and the second connecting member 222, the impact force of the collision can be better transmitted to the crossbeam reinforcement body 21 supported by a composite material with higher compressive strength, and then the intrusion amount under side collision and pillar collision conditions can be reduced through the crossbeam reinforcement body 21, thereby ensuring the collision safety of the entire vehicle.

[0029] Furthermore, the cross-beam reinforcement body 21 and the connecting bracket 22 are both made of composite materials. Specifically, the cross-beam reinforcement body 21 and the connecting bracket 22 can be made of composite materials made using different molding processes, and the cross-section of the cross-beam reinforcement body 21 made of composite materials can be optimized and designed according to collision safety requirements, which are not limited here. Since composite materials are lighter than sheet metal materials, the lightweight requirements of the cross-beam reinforcement structure 2 are met.

[0030] In the above-mentioned embodiment of the utility model, the crossbeam reinforcement structure 2 includes a crossbeam reinforcement body 21 arranged on the vehicle body crossbeam 1 and a connecting bracket 22 connected between the sill beam inner plate 7 and the crossbeam reinforcement body 21, so that the crossbeam reinforcement body 21 can enhance the structural strength of the vehicle body crossbeam 1 and improve the safety performance of the vehicle body crossbeam 1; and the crossbeam reinforcement body 21 and the connecting bracket 22 are plug-connected with each other through the second connecting member 211 and the first connecting member 222. In this way, while ensuring the structural performance and connection stability of the crossbeam reinforcement structure 2, the impact force of the collision can be better transmitted to the crossbeam reinforcement body 21 with higher compressive strength through the first connecting member 211 and the second connecting member 211, and then the intrusion amount under side collision and column collision conditions is reduced through the crossbeam reinforcement body 21, thereby ensuring the collision safety of the whole vehicle.

[0031] In one embodiment, if Figure 2 and Figure 3As shown, the connecting bracket 22 includes an energy absorption box 221; the energy absorption box 221 includes a box body 2211 having an energy absorption cavity and connected to the second connecting member 222, and at least one first reinforcing rib 2212 arranged in the energy absorption cavity at intervals; the second connecting member 222 is connected to the box body 2211, and the first reinforcing rib 2212 is parallel to the length direction of the cross beam reinforcement body 21. It can be understood that the energy absorption cavity of the energy absorption box 221 can absorb collision energy by self-collapse, thereby improving the energy absorption efficiency of the reinforcement 2 and improving the anti-collision performance of the vehicle body cross beam 1. The second connecting member 222 is connected to the outer side wall of the box body 2211, and one or more first reinforcing ribs 2212 can be arranged in the box body 2211, and the length of the first reinforcing rib 2212 and the interval width between two adjacent first reinforcing ribs 2212 can be set according to requirements. In a further embodiment, a plurality of first reinforcing ribs 2212 may be provided in the box body 2211, and the plurality of first reinforcing ribs 2212 are evenly spaced in the energy absorbing cavity to divide the energy absorbing box 221 into a plurality of energy absorbing units. Thus, when the energy absorbing box 221 absorbs collision energy by crushing itself, the design of the first reinforcing ribs 2212 and the plurality of energy absorbing units may further improve the anti-collision performance.

[0032] In one embodiment, if Figure 2 and Figure 3 As shown, the cross beam reinforcement structure 2 further includes a first structural adhesive layer 3, and the second connector 222 is bonded to the first connector 211 through the first structural adhesive layer 3. Specifically, when the first connector 211 is a mortise and the second connector 222 is a tenon, the first structural adhesive layer 3 is covered on the second connector 222, the second connector 222 is inserted into the first connector 211 and bonded to the inner side wall of the first connector 211 through the first structural adhesive layer 3. When the first connector 211 is a tenon and the second connector 222 is a mortise, the first structural adhesive layer 3 is covered on the first connector 211, the first connector 211 is inserted into the second connector 222 and bonded to the inner side wall of the second connector 222 through the first structural adhesive layer 3.

[0033] It can be understood that a mounting gap is reserved at the connection between the second connector 222 and the first connector 211, and the width of the mounting gap is adapted to the thickness of the first structural adhesive layer 3; thus, when the second connector 222 is plugged into the first connector 211 (or the first connector 211 is plugged into the second connector 222), the first structural adhesive layer 3 is installed in the mounting gap and connects the second connector 222 and the first connector 211, thereby increasing the stability of the mutual plug-in connection between the beam reinforcement body 21 and the connecting bracket 22. Furthermore, the first structural adhesive layer 3 can be an expansion structural adhesive. During electrophoresis baking, the expansion structural adhesive (first structural adhesive layer 3) in the reserved mounting gap (the reserved mounting gap can be set according to requirements, such as 4 mm) at the connection between the second connector 222 and the first connector 211 foams, so that the beam reinforcement body 21 made of composite materials and the connecting bracket 22 are connected through the foamed expansion structural adhesive.

[0034] In one embodiment, if Figure 2 As shown, the cross beam reinforcement body 21 is also provided with a hollow cavity 212; the cross beam reinforcement body 21 includes a second reinforcing rib 213 arranged in the hollow cavity 212, and the second reinforcing rib 213 is parallel to the length direction of the cross beam reinforcement body 21. The design of the hollow cavity 212 and the second reinforcing rib 213 can reduce the weight of the whole vehicle while improving the rigidity of the cross beam reinforcement body 21 and the safety performance of the vehicle body collision. Further, when the first connecting member 211 is a mortise, and the second connecting member 222 is a tenon, the hollow cavity 212 is connected to the first connecting member 211 as a mortise; at this time, the cross beam reinforcement body 21 is provided with a hollow cavity 212 connected to the first connecting member 211, and the second connecting member 222 of the connecting bracket 22 is inserted into the first connecting member 211 connected to the hollow cavity 212 and connected to the cross beam reinforcement body 21 by mortise and tenon.

[0035] In a specific embodiment, according to the requirements of stiffness, energy absorption efficiency and size of the hollow cavity 212, the hollow cavity 212 of the beam reinforcement body 21 can be enclosed by a first vertical plate, a first horizontal plate, a second vertical plate and a second horizontal plate connected in sequence, thereby obtaining a rectangular (or similar to a rectangle but slightly deformed) hollow cavity. Furthermore, the second reinforcing rib 213 is parallel to the length direction of the beam reinforcement body 21 and is connected between the first horizontal plate and the second horizontal plate, and the first vertical plate, the second reinforcing rib 213 and the second vertical plate are arranged in parallel and at intervals; further, the first vertical plate, the first horizontal plate, the second vertical plate, the second horizontal plate and the second reinforcing rib 213 constitute a beam reinforcement body 21 with a Japanese-shaped cross-section.

[0036] It can be understood that when the first connecting member 211 is a mortise and the second connecting member 222 is a tenon, the tenons on the connecting bracket 22 can be set to be multiple, and the second reinforcing rib 213 can extend from the hollow cavity 212 to the mortise, and then, when the tenon of the connecting bracket 22 is connected with the mortise and tenon of the beam reinforcement body 21, the second reinforcing rib 213 is inserted between the reserved gaps of two adjacent tenons; further, after the second reinforcing rib 213 is inserted into the reserved gap, it can abut against the box body 2211 of the energy absorption box 221, so that the connection between the beam reinforcement body 21 and the connecting bracket 22 is more stable. Furthermore, the number of the second reinforcing ribs 213 can be set to two or more. For example, when there are two second reinforcing ribs 213, the first vertical plate, the first horizontal plate, the second vertical plate, the second horizontal plate and the two second reinforcing ribs 213 can constitute a crossbeam reinforcement body 21 with a cross-section of a U-shaped cross-section, thereby further improving the rigidity of the crossbeam reinforcement body 21 and the safety performance of the vehicle body collision. It can be understood that when there are two second reinforcing ribs 213, the gap between the tenons needs to be reserved and two need to be set accordingly. Therefore, the tenons can be set to three at this time; the other number settings are similar and will not be repeated here. Furthermore, when the first connecting member 211 is a tenon; the second connecting member 222 is a mortise, the settings of the tenon and the mortise can also be uniformly set with reference to the above embodiments, and will not be repeated here.

[0037] In a further embodiment, the cross-beam reinforcement body 21 is a pultruded structural member made of continuous glass fiber reinforced polyurethane. The average thickness of the cross-beam reinforcement body 1 needs to be greater than 2 mm, and the radius of the inner cavity fillet at the connection position of each plate of the cross-beam reinforcement body 1 is greater than or equal to 3 mm, so as to prevent the glass fiber from breaking or deflecting during the pultrusion process, resulting in the formation of a resin-rich area, which affects the overall mechanical properties of the beam.

[0038] In one embodiment, the cross beam reinforcement body 21 is a pultruded structural member made of continuous glass fiber reinforced polyurethane, and the connecting bracket 22 is an injection molded structural member made of glass fiber reinforced polyamide. It can be understood that the cross beam reinforcement body 21 is formed by pultrusion of continuous glass fiber reinforced polyurethane, a composite material, and the connecting bracket 22 is formed by injection molding of glass fiber reinforced polyamide, a composite material, and after the two composite materials are made by different molding methods, they are connected to each other by plugging into each other to form a reinforcement 2. In this way, the reinforcement is composed entirely of composite materials and can be electrophoresed on the body without the need to add other workstations and has no impact on the production line; and the reinforcement 2 made entirely of composite materials can increase the energy absorption efficiency of the vehicle body cross beam 1 by about 31.5% under side collision conditions. Under the same size, the composite material can reduce the weight by about 1.3kg (weight reduction ratio of 43%) compared to sheet metal materials, thereby enhancing the safety performance of the reinforcement 2 and taking into account the lightweight requirements. It also solves the problem of balancing the performance and connectivity of the reinforcement 2 structure of the composite material made by a single molding process, thereby improving the strength, stiffness and energy absorption efficiency of the cross beam reinforcement structure 2.

[0039] The utility model also provides a vehicle body cross beam 1, including the above-mentioned cross beam reinforcement structure 2. In the above-mentioned vehicle body cross beam of the utility model, the cross beam reinforcement structure 2 includes a cross beam reinforcement body 21 arranged on the vehicle body cross beam 1 and a connecting bracket 22 connected between the sill beam inner plate 7 and the cross beam reinforcement body 21, so that the cross beam reinforcement body 21 can enhance the structural strength of the vehicle body cross beam 1 and improve the safety performance of the vehicle body cross beam 1; and the cross beam reinforcement body 21 and the connecting bracket 22 are plug-connected with each other through the second connecting member 211 and the first connecting member 222, so that while ensuring the structural performance and connection stability of the cross beam reinforcement structure 2, the second connecting member 211 can also better transmit the impact force of the collision to the cross beam reinforcement body 21 with higher compressive strength, thereby reducing the intrusion amount under side collision and column collision conditions through the cross beam reinforcement body 21, thereby ensuring the collision safety of the whole vehicle.

[0040] In one embodiment, if Figures 2 to 4 As shown, the connecting bracket 22 is provided with a clamping piece 223, and the vehicle body cross beam 1 includes a cross beam body 120 provided with a clamping hole 110; the connecting bracket 22 is installed on the cross beam body 120 through the clamping piece 223 and the clamping hole 110 that are clamped with each other. It can be understood that in order to enhance the firmness of the connection between the cross beam reinforcement structure 2 and the vehicle body cross beam 1, the clamping piece 223 is installed in the energy absorption cavity of the energy absorption box 221 of the connecting bracket 22, and the clamping hole 110 is provided on the cross beam body 120 of the vehicle body cross beam 1, and the clamping piece 223 is clamped with the clamping hole 110, so that the connection between the cross beam reinforcement structure 2 and the vehicle body cross beam 1 is more stable.

[0041] like Figure 1 As shown, the utility model further provides a vehicle, comprising a front floor 5, a sill beam inner plate 7 fixedly connected to opposite sides of the front floor 5, and the above-mentioned vehicle body cross beam 1; the vehicle body cross beam 1 is installed on the front floor 5. In the vehicle in the above-mentioned embodiment of the utility model, as Figure 1 As shown, the vehicle body cross beam 1 includes a cross beam body 120 and a cross beam reinforcement structure 2 installed on the cross beam body 120; a receiving cavity is formed between the cross beam body 120 and the front floor 5, and the cross beam reinforcement structure 2 is installed in the receiving cavity; the cross beam reinforcement structure 2 includes a cross beam reinforcement body 21 and a connecting bracket 22, both of which are made of composite materials; the cross beam reinforcement body 21 and the connecting bracket 22 are plug-connected to each other through a second connecting member 211 and a first connecting member 222.

[0042] In the above-mentioned vehicle of the utility model, the crossbeam reinforcement structure 2 includes a crossbeam reinforcement body 21 arranged on the vehicle body crossbeam 1 and a connecting bracket 22 connected between the sill beam inner plate 7 and the crossbeam reinforcement body 21, so that the crossbeam reinforcement body 21 can enhance the structural strength of the vehicle body crossbeam 1 and improve the safety performance of the vehicle body crossbeam 1; and the crossbeam reinforcement body 21 and the connecting bracket 22 are plug-connected with each other through the second connecting member 211 and the first connecting member 222, so that while ensuring the structural performance and connection stability of the crossbeam reinforcement structure 2, the second connecting member 211 can also better transmit the impact force of the collision to the crossbeam reinforcement body 21 with higher compressive strength, and then reduce the intrusion amount under side collision and column collision conditions through the crossbeam reinforcement body 21, thereby ensuring the collision safety of the whole vehicle.

[0043] In one embodiment, if Figure 1 and Figure 2 As shown, the vehicle further includes a shock-absorbing rubber layer 6 disposed between the cross beam reinforcement body 21 and the front floor 5, and the cross beam reinforcement body 21 is bonded to the front floor 5 through the shock-absorbing rubber layer 6. It can be understood that the cross beam reinforcement structure 2 is bonded to the front floor 5 through the shock-absorbing rubber layer 6, and the cross beam reinforcement structure 2 is also installed on the vehicle body cross beam 1 through the mutually engaged clamping parts 223 and the clamping holes 110. In this way, the cross beam reinforcement structure 2 is placed in the accommodating cavity between the vehicle body cross beam 1 and the front floor 5, and is bonded to the front floor 5 through the shock-absorbing rubber layer 6 to form a vehicle body cross beam assembly structure, which increases the section moment of inertia of the vehicle body cross beam 1 assembly structure, which is beneficial to improving the torsional rigidity of the vehicle body. Furthermore, the shock-absorbing rubber layer 6 can be an expandable structural adhesive. The shock-absorbing rubber layer 6 is bonded to the bottom wall of the beam reinforcement body 21. During electrophoretic baking, the shock-absorbing rubber layer 6 foams, so that the beam reinforcement body 21 made of the composite material is bonded to the front floor 5, and the shock-absorbing rubber layer 6 can also play a role in buffering the impact force when the vehicle body beam 1 assembly is hit.

[0044] In one embodiment, if Figures 1 to 3 As shown, the vehicle further includes a second structural adhesive layer 4 covered on the connecting bracket 22, and the connecting bracket 22 is bonded to the sill beam inner plate 7 and the front floor 5 through the second structural adhesive layer 4. Further, a flange is provided on the front floor 5, and the flange is welded on the sill beam inner plate 7 to achieve a fixed connection between the sill beam inner plate 7 and the front floor 5; the box body 2211 of the energy absorption box 221 of the connecting bracket 22 is covered with the second structural adhesive layer 4 on the side wall facing the sill beam inner plate 7 and the bottom wall facing the front floor 5, so that the connection between the connecting bracket 22 and the sill beam inner plate 7 and the front floor 5 can be achieved through the second structural adhesive layer 4. Furthermore, the second structural adhesive layer 4 can be an expandable structural adhesive, and the crossbeam reinforcement body 21 and the connecting bracket 22 made of composite materials can be electrophoresed on the go, without the need to add other workstations, and without affecting the production line; during electrophoresis baking, the second structural adhesive layer 4 foams, so that the connecting bracket 22 is connected to the sill beam inner plate 7 and the front floor 5 through the second structural adhesive layer 4 through the foamed second structural adhesive layer 4.

[0045] The above are merely embodiments of the crossbeam reinforcement structure, vehicle body crossbeam and vehicle of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A beam reinforcement structure, characterized in that: It includes a crossbeam reinforcement body arranged on the vehicle body crossbeam and a connecting bracket connected between the sill beam inner plate and the crossbeam reinforcement body, the crossbeam reinforcement body is provided with a first connecting member, the connecting bracket is provided with a second connecting member, and the first connecting member is connected to the second connecting member.

2. The beam reinforcement structure according to claim 1, characterized in that: The connecting bracket includes an energy absorption box; the energy absorption box includes a box body having an energy absorption cavity and connected to the second connecting member, and at least one first reinforcing rib arranged at intervals in the energy absorption cavity; the second connecting member is connected to the box body, and the first reinforcing rib is parallel to the length direction of the beam reinforcement body.

3. The beam reinforcement structure according to claim 2, characterized in that: The cross beam reinforcement structure further includes a first structural adhesive layer, and the second connecting member and the first connecting member are bonded to each other via the first structural adhesive layer.

4. The beam reinforcement structure according to claim 1, characterized in that: The cross beam reinforcement body is also provided with a hollow cavity; the cross beam reinforcement body includes a second reinforcement rib arranged in the hollow cavity, and the second reinforcement rib is parallel to the length direction of the cross beam reinforcement body.

5. The beam reinforcement structure according to claim 1, characterized in that: The crossbeam reinforcement body is a pultrusion structure made of continuous glass fiber reinforced polyurethane, and the connecting bracket is an injection molding structure made of glass fiber reinforced polyamide.

6. The beam reinforcement structure according to claim 1, characterized in that: The first connecting member is a mortise; the second connecting member is a tenon; or The first connecting member is a tenon; the second connecting member is a mortise.

7. A vehicle body cross beam, characterized in that: The invention comprises a cross beam reinforcement structure as claimed in any one of claims 1 to 6.

8. The vehicle body cross beam according to claim 7, characterized in that: The connecting bracket is provided with a clamping piece, and the vehicle body cross beam comprises a cross beam body provided with a clamping hole; the connecting bracket is installed on the cross beam body through the clamping piece and the clamping hole which are clamped with each other.

9. A vehicle, characterized in that: It comprises a front floor, a sill beam inner plate fixedly connected to opposite sides of the front floor, and a vehicle body cross beam as claimed in claim 7 or 8; the vehicle body cross beam is installed on the front floor.

10. The vehicle according to claim 9, characterized in that The vehicle further includes a shock-absorbing rubber layer disposed between the cross-beam reinforcement body and the front floor, and the cross-beam reinforcement body is bonded to the front floor through the shock-absorbing rubber layer.

11. The vehicle according to claim 10, characterized in that The vehicle further comprises a second structural adhesive layer covered on the connecting bracket, and the connecting bracket is bonded to the sill beam inner plate and the front floor through the second structural adhesive layer.

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