Front longitudinal beam structure of vehicle body

Abstract

The present invention relates to a front longitudinal beam structure for a vehicle body, and belongs to the technical field of automobile design and manufacturing. The front longitudinal beam structure of the present invention comprises a front longitudinal beam assembly, an upper side beam assembly, a front longitudinal beam connecting plate assembly, an upper side beam front section assembly, a front anti-collision beam energy absorption box assembly, and a front anti-collision beam assembly. The front longitudinal beam structure of the present invention optimizes the force transmission path, effectively improves the energy absorption capacity of the front end of the vehicle body, reduces the load on the cabin longitudinal beam, reduces or avoids the intrusion of the front cabin into the passenger compartment, and improves driver safety.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile design and manufacturing, and more particularly to a front longitudinal beam structure of a vehicle body. Background Art

[0002] Domestic car buyers are increasingly paying attention to vehicle collision safety assessments. One of the assessment criteria is offset collisions, which include 25% and 40% offset collisions. These scenarios involve the overlap between the vehicle and the colliding object being 25% and 40% of the vehicle's width, respectively. The smaller the overlap, the greater the impact pressure on the vehicle, leading to stricter collision requirements for the vehicle's body.

[0003] Most models currently on the market transmit collision forces primarily through the front longitudinal beam during a collision, thereby reducing the amount of intrusion of the front engine compartment into the passenger compartment. However, due to the single collision force transmission path and the lack of a closed-loop structure, in most cases, stiffness and strength are enhanced by adding reinforcing plates or increasing the material thickness. However, these measures often fail to meet the requirements of collision regulations and can lead to welding difficulties and high material costs. In the prior art, during a 25% offset collision, due to the different collision points, when the car collides, the collision block does not fully contact the front longitudinal beam to transmit force, but only produces a certain degree of bending deformation. The collision force is mainly absorbed by the upper longitudinal beam, which ultimately bends severely, causing the engine compartment to intrude into the passenger compartment. This is also the main reason why the A-pillar bends in 25% collisions on many current models.

[0004] Figure 1 and Figure 2 Schematic diagrams of the transmission of collision force of the front longitudinal beam of the vehicle body in the prior art in a 40% offset collision or head-on collision, and a 25% offset collision (indicated by the arrows in the figure) are respectively shown. The front longitudinal beam structure of the vehicle body is relatively simple in the transmission path and cannot achieve a good force transmission effect. In a 25% offset collision, the front longitudinal beam cannot transmit the collision force. Summary of the Invention

[0005] In order to solve the above technical problems existing in the prior art, an object of the present invention is to provide a front longitudinal beam structure of a vehicle body.

[0006] The front longitudinal beam structure of the vehicle body of the present invention comprises a front longitudinal beam assembly, an upper side beam assembly, a front longitudinal beam connecting plate assembly, an upper side beam front section assembly, a front anti-collision beam energy absorption box assembly and a front anti-collision beam assembly; the front longitudinal beam connecting plate assembly comprises a front longitudinal beam connecting plate body, the front longitudinal beam connecting plate body comprises an open box body, a front longitudinal beam connecting reinforcement plate is provided on the bottom wall opposite to the opening in the box body, an energy absorption box mounting bracket is provided on the front wall of the box body, a front longitudinal beam connecting sealing plate is provided on the rear wall of the box body, The box body has a cross-section that gradually decreases from the front wall toward the rear wall; the front longitudinal beam connecting plate body and the front longitudinal beam connecting cover plate are welded to the front longitudinal beam assembly, the bottom wall of the box body is welded and fixed to the front end of the upper side beam front section assembly, and the energy absorption box mounting bracket is screwed and fixed to the front anti-collision beam energy absorption box assembly; the rear end of the upper side beam front section assembly is welded and fixed to the upper side beam assembly; and the front anti-collision beam energy absorption box assembly is respectively connected to the front anti-collision beam assembly, the front longitudinal beam assembly and the front longitudinal beam connecting plate assembly.

[0007] Wherein, the front longitudinal beam is connected to both sides of the reinforcing plate and extends to the upper wall and the lower wall of the box body.

[0008] Wherein, the outer ends of the upper wall and the lower wall are provided with welding flanges, and the welding flanges of the front longitudinal beam connecting plate body are welded to the front longitudinal beam assembly.

[0009] The front anti-collision beam energy absorption box assembly is composed of an energy absorption box body, an energy absorption box mounting plate and an energy absorption box front cover plate.

[0010] Among them, the energy absorption box body is composed of an energy absorption box upper plate, an energy absorption box lower plate and an energy absorption box inner plate. The two sides of the energy absorption box upper plate and the energy absorption box lower plate are welded to form a cavity structure with open front and rear ends. The energy absorption box inner plate is arranged between the energy absorption box upper plate and the energy absorption box lower plate and is spot-welded to the inner surfaces of the energy absorption box upper plate and the energy absorption box lower plate respectively.

[0011] Wherein, the energy absorption box mounting plate is arranged on the rear end surface of the energy absorption box body, and the energy absorption box front sealing plate is fixed on the front end surface of the energy absorption box body.

[0012] The front sealing plate of the energy absorption box is fixed to the front anti-collision beam assembly by welding, and the mounting plate of the energy absorption box is fixed to the front end of the front longitudinal beam assembly by screwing.

[0013] Wherein, the energy absorption box mounting plate is screwed and fixed to the energy absorption box mounting bracket of the front longitudinal beam connecting plate assembly.

[0014] The energy absorption box body has a gradually increasing cross-section from the front end to the rear end.

[0015] Among them, the upper side beam front section assembly is composed of an upper side beam front section outer plate, an upper side beam front section inner plate and an upper side beam front section reinforcement plate. The upper side beam front end reinforcement plate is welded to the upper side beam front section inner plate, and the upper side beam front section outer plate is welded to the upper side beam front section inner plate.

[0016] Compared with the prior art, the vehicle body front longitudinal beam structure of the present invention has the following beneficial effects:

[0017] The front longitudinal beam structure of the vehicle body in this embodiment optimizes the force transmission path, effectively improves the energy absorption capacity of the front end of the vehicle body, reduces the load on the cabin longitudinal beam, reduces or avoids the intrusion of the front cabin into the passenger compartment, and improves driver safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the collision force transmission of a vehicle body front longitudinal beam structure in the prior art in a 40% offset collision or a 100% head-on collision.

[0019] Figure 2 This is a schematic diagram of the collision force transmission of a 25% offset collision of a vehicle body front longitudinal beam structure in the prior art.

[0020] Figure 3 It is an axonometric view of the front longitudinal beam structure of the vehicle body of the present invention.

[0021] Figure 4 It is a top view of the front longitudinal beam structure of the vehicle body of the present invention.

[0022] Figure 5 It is a front view of the vehicle body front longitudinal beam structure of the present invention.

[0023] Figure 6 It is a three-dimensional view of the front longitudinal beam connecting plate assembly in the present invention.

[0024] Figure 7 It is a top view of the front longitudinal beam connecting plate assembly in the present invention.

[0025] Figure 8 It is a front view of the front longitudinal beam connecting plate assembly in the present invention.

[0026] Figure 9 It is a rear view of the front longitudinal beam connecting plate assembly in the present invention.

[0027] Figure 10 It is a left view of the front longitudinal beam connecting plate assembly in the present invention.

[0028] Figure 11 It is a three-dimensional diagram of the front end assembly of the upper side rail in the present invention.

[0029] Figure 12 It is a front view of the upper side rail front end assembly in the present invention.

[0030] Figure 13 It is a top view of the front end assembly of the upper side rail in the present invention.

[0031] Figure 14 It is a three-dimensional diagram of the energy absorption box body assembly in the present invention.

[0032] Figure 15 It is a three-dimensional diagram of the front anti-collision beam energy absorption box assembly in the present invention.

[0033] Figure 16 It is a front view of the front anti-collision beam energy absorption box assembly in the present invention.

[0034] Figure 17 It is a top view of the front anti-collision beam energy absorption box assembly in the present invention.

[0035] Figure 18 It is a left view of the front anti-collision beam energy absorption box assembly in the present invention.

[0036] Figure 19 This is the assembly drawing of the front longitudinal beam assembly and the front longitudinal beam connecting plate assembly.

[0037] Figure 20 for Figure 19 Schematic diagram of the cross-sectional structure along the AA direction.

[0038] Figure 21 This is the assembly drawing of the front longitudinal beam connecting plate assembly and the upper side beam front end assembly.

[0039] Figure 22 for Figure 21 Schematic diagram of the cross-sectional structure along the BB direction.

[0040] Figure 23 This is the assembly drawing of the upper side rail front section assembly and the upper side rail assembly.

[0041] Figure 24 for Figure 23 Schematic diagram of the cross-sectional structure along the CC direction.

[0042] Figure 25 This is an assembly diagram of the front anti-collision beam energy absorption box assembly in the present invention.

[0043] Figure 26 for Figure 25 Schematic diagram of the cross-sectional structure along the DD direction.

[0044] Figure 27 for Figure 25 Schematic diagram of the cross-sectional structure along the EE direction.

[0045] Figure 28 Schematic diagram of the installation points of the front anti-collision beam energy absorption box assembly in the present invention.

[0046] Figure 29 It is a schematic diagram of the collision force transmission of the front longitudinal beam structure of the vehicle body of the present invention. DETAILED DESCRIPTION

[0047] The vehicle body front longitudinal beam structure of the present invention will be further described below in conjunction with specific embodiments to help those skilled in the art to have a more complete, accurate and in-depth understanding of the technical solution of the present invention.

[0048] Example 1

[0049] like Figure 3-5 As shown, the front longitudinal beam structure of the vehicle body in this embodiment includes a front longitudinal beam assembly 10, an upper side beam assembly 20, a front longitudinal beam connecting plate assembly 30, an upper side beam front section assembly 40, a front anti-collision beam energy absorption box assembly 50 and a front anti-collision beam assembly 80.

[0050] like Figure 6-10 As shown, the front longitudinal beam connecting plate assembly 30 includes a front longitudinal beam connecting plate body 31, and the front longitudinal beam connecting plate body 31 includes an open box body, a front longitudinal beam connecting reinforcement plate 32 is provided on the bottom wall of the box body opposite to the opening, and both sides of the front longitudinal beam connecting reinforcement plate 32 extend to the upper wall and lower wall of the box body, an energy absorption box mounting bracket 34 is provided on the front wall of the box body, and a front longitudinal beam connecting sealing plate 33 is provided on the rear wall of the box body, and welding flanges 35 are provided at the outer ends of the upper wall and the lower wall, and the box body has a cross-section that gradually decreases from the front wall to the rear wall, so that the collision force can be guided to the front longitudinal beam assembly 10, and part of the collision force is transmitted from the bottom wall to the upper side beam front section assembly. Figure 19-20 As shown, the welding flange 35 of the front longitudinal beam connecting plate body 31 and the front longitudinal beam connecting cover plate 33 are welded to the front longitudinal beam assembly 10 , and the bottom wall of the box body is welded and fixed to the front end of the upper side beam front section assembly 40 .

[0051] like Figure 14-18 As shown, the front anti-collision beam energy absorption box assembly 50 is composed of an energy absorption box body 51, an energy absorption box mounting plate 55 and an energy absorption box front sealing plate 56; the energy absorption box body 51 is composed of an energy absorption box upper plate 52, an energy absorption box lower plate 53 and an energy absorption box inner plate 54, and the two sides of the energy absorption box upper plate 52 and the energy absorption box lower plate 53 are connected by spot welding to form a cavity structure with open front and rear ends, and the energy absorption box inner plate 54 is arranged between the energy absorption box upper plate 52 and the energy absorption box lower plate 53 and is spot welded to the inner surfaces of the energy absorption box upper plate 52 and the energy absorption box lower plate 53 respectively. The energy absorption box mounting plate 55 is fixed to the rear end face of the energy absorption box body 51 by MIG welding, and the energy absorption box front sealing plate 56 is fixed to the front end face of the energy absorption box body 51 by MIG welding. As shown Figure 3-5As shown in Figures 25-28, the crash box front cover plate 56 is fixed to the front anti-collision beam assembly 80 by MIG welding, while the crash box mounting plate 55 is fixedly connected to the front end of the front longitudinal beam assembly 10 by bolts 60 and projection weld nuts 70. The crash box mounting plate 55 is fixedly connected to the crash box mounting bracket 34 of the front longitudinal beam connecting plate assembly 30 by bolts 60 and projection weld nuts 70. The crash box body 51 has a gradually increasing cross-section from the front end to the rear end. This cross-sectional design facilitates the transmission of collision forces from the front anti-collision beam assembly to the front longitudinal beam assembly 10 and the front longitudinal beam connecting plate assembly 30.

[0052] like Figure 11-13 As shown, the upper side beam front section assembly 40 is composed of an upper side beam front section outer plate 41, an upper side beam front section inner plate 42 and an upper side beam front section reinforcement plate 43. The upper side beam front end reinforcement plate 43 is welded to the upper side beam front section inner plate 42, and the upper side beam front section outer plate 41 is welded to the upper side beam front section inner plate 42.

[0053] like Figure 23-24 As shown, the rear end of the roof side rail front section assembly 40 is welded to the roof side rail assembly 20 .

[0054] Figure 29 A schematic diagram of the transmission of collision force during an offset collision (including a 25% offset collision and a 40% offset collision) or a head-on collision test is shown. This embodiment utilizes the front longitudinal beam connecting plate assembly and the front upper side beam assembly, particularly the unique structural design of the front longitudinal beam connecting plate assembly, which connects the front anti-collision beam energy absorption box assembly, the front longitudinal beam assembly, and the front upper side beam assembly. This effectively transmits collision force to the front longitudinal beam assembly and then to the upper side beam assembly via the front upper side beam assembly, thereby optimizing the collision force transmission path, reducing or preventing the intrusion of the front engine compartment into the passenger compartment, and improving driver safety. Furthermore, the combination and structural design of the front anti-collision beam energy absorption box assembly and the front longitudinal beam connecting plate assembly significantly improve the energy absorption capacity of the front end of the vehicle body and significantly enhance the energy absorption effect of the front anti-collision beam assembly. This ensures that only the anti-collision beam assembly is damaged, reducing the load on the cabin longitudinal beams and leaving the cabin skeleton structure intact. Therefore, after a serious collision, only the anti-collision beam assembly needs to be replaced, reducing maintenance costs. The vehicle body front longitudinal beam structure of this embodiment can reduce the strength requirement for the cabin longitudinal beam, thereby appropriately reducing the material properties of the cabin longitudinal beam, such as material thickness, strength grade, etc., thereby achieving the purpose of reducing cost and weight.

[0055] For ordinary technicians in this field, the specific embodiments are only illustrative descriptions of the present invention. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A front longitudinal beam structure of a vehicle body, characterized by: The front longitudinal beam assembly comprises a front longitudinal beam connecting plate assembly, an upper side beam assembly, a front longitudinal beam connecting plate assembly, an upper side beam front section assembly, a front anti-collision beam energy absorption box assembly and a front anti-collision beam assembly; the front longitudinal beam connecting plate assembly comprises a front longitudinal beam connecting plate body, the front longitudinal beam connecting plate body comprises an open box body, a front longitudinal beam connecting reinforcement plate is arranged on the bottom wall opposite to the opening in the box body, an energy absorption box mounting bracket is arranged on the front wall of the box body, a front longitudinal beam connecting sealing plate is arranged on the rear wall of the box body, and the box body has a cross-section that gradually becomes smaller from the front wall toward the rear wall; the front longitudinal beam connecting plate body and the front longitudinal beam connecting sealing plate are welded to the front longitudinal beam connecting plate body. On the longitudinal beam assembly, the bottom wall of the box body is welded and fixed to the front end of the upper side beam front section assembly, and the energy absorption box mounting bracket is screwed and fixed to the front anti-collision beam energy absorption box assembly; the rear end of the upper side beam front section assembly is welded and fixed to the upper side beam assembly; and the front anti-collision beam energy absorption box assembly is respectively connected to the front anti-collision beam assembly, the front longitudinal beam assembly and the front longitudinal beam connecting plate assembly, and in a plane parallel to the rear end face of the front anti-collision beam energy absorption box assembly, the projected area of ​​the front longitudinal beam assembly and the projected area of ​​the front longitudinal beam connecting plate assembly respectively at least partially overlap with the projected area of ​​the front anti-collision beam energy absorption box assembly, The surface of the front anti-collision beam energy absorption box assembly facing the outside of the vehicle is a single continuous inclined surface, and the inclined surface gradually tilts outward from the front to the rear of the vehicle. The front anti-collision beam energy absorption box assembly also has a first surface connected to the front anti-collision beam assembly, and a second surface connected to the front longitudinal beam assembly and the front longitudinal beam connecting plate assembly respectively. The first surface, the inclined surface and the second surface are connected in sequence, In a horizontal cross section, in the area between the rear side surface of the front bumper beam energy absorption box assembly and the second surface, there is no recessed structure recessed toward the inside of the vehicle between the front bumper beam energy absorption box assembly, the front longitudinal beam assembly and the front longitudinal beam connecting plate assembly.

2. The vehicle body front longitudinal beam structure according to claim 1, characterized in that: The front longitudinal beam is connected to both sides of the reinforcing plate and extends to the upper wall and the lower wall of the box body.

3. The vehicle body front longitudinal beam structure according to claim 2, characterized in that: The outer ends of the upper wall and the lower wall are provided with welding flanges, and the welding flanges of the front longitudinal beam connecting plate body are welded to the front longitudinal beam assembly.

4. The vehicle body front longitudinal beam structure according to claim 1, characterized in that: The front anti-collision beam energy absorption box assembly is composed of an energy absorption box body, an energy absorption box mounting plate and an energy absorption box front sealing plate.

5. The vehicle body front longitudinal beam structure according to claim 4, characterized in that: The energy absorption box body is composed of an energy absorption box upper plate, an energy absorption box lower plate and an energy absorption box inner plate. The two sides of the energy absorption box upper plate and the energy absorption box lower plate are welded to form a cavity structure with open front and rear ends. The energy absorption box inner plate is arranged between the energy absorption box upper plate and the energy absorption box lower plate and is spot-welded to the inner surfaces of the energy absorption box upper plate and the energy absorption box lower plate respectively.

6. The vehicle body front longitudinal beam structure according to claim 5, characterized in that: The energy absorption box mounting plate is arranged on the rear end surface of the energy absorption box body, and the energy absorption box front sealing plate is fixed on the front end surface of the energy absorption box body.

7. The vehicle body front longitudinal beam structure according to claim 6, characterized in that: The front sealing plate of the energy absorption box is fixed to the front anti-collision beam assembly by welding, and the mounting plate of the energy absorption box is fixed to the front end of the front longitudinal beam assembly by screwing.

8. The vehicle body front longitudinal beam structure according to claim 6, characterized in that: The energy absorption box mounting plate is screwed and fixed to the energy absorption box mounting bracket of the front longitudinal beam connecting plate assembly.

9. The vehicle body front longitudinal beam structure according to claim 5, characterized in that: The energy absorption box body has a cross-section that gradually increases from the front end to the rear end.

10. The vehicle body front longitudinal beam structure according to claim 1, characterized in that: The upper side beam front section assembly consists of an upper side beam front section outer plate, an upper side beam front section inner plate and an upper side beam front section reinforcement plate. The upper side beam front end reinforcement plate is welded to the upper side beam front section inner plate, and the upper side beam front section outer plate is welded to the upper side beam front section inner plate.

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