Automobile body front wall plate lower beam assembly

Abstract

The application discloses a front wall plate lower cross beam assembly for a car body, which comprises a front wall plate lower cross beam, a front floor assembly matching surface, a sheet metal matching surface, an A column inner plate matching surface, a right front longitudinal beam matching surface and a left front longitudinal beam matching surface.

Description

Technical Field

[0001] This invention relates to the field of automotive body structure technology, and more particularly to the lower crossbeam assembly of the front bulkhead of an automotive body. Background Technology

[0002] The lower crossbeam of the front bulkhead is an important load-bearing component in the front structure of the vehicle. Located at the bottom of the front bulkhead, it connects several key structures such as the front longitudinal beam, the inner A-pillar panel, and the front floor assembly. It plays a crucial role in improving the torsional rigidity of the vehicle body, frontal collision performance, and supporting the installation of various systems in the front compartment.

[0003] Existing front bulkhead lower crossbeam assemblies typically feature simple structural designs, with insufficient connection strength and rigidity between mating surfaces. During vehicle movement or a collision, stress can easily concentrate in localized areas, leading to structural deformation or failure. Furthermore, the current design suffers from inefficient placement of numerous accessories mounted on the front bulkhead lower crossbeam, such as the accelerator pedal bracket, wiring harness box, heat pump system, and battery pack water inlet pipe, resulting in limited installation space, pipeline interference, and low assembly efficiency. Additionally, the lack of energy-absorbing structures in some areas fails to effectively attenuate collision energy from the front longitudinal beam, impacting the overall passive safety performance of the vehicle. Summary of the Invention

[0004] The purpose of this invention is to provide a technical solution for the lower crossbeam assembly of the front bulkhead of an automobile body to address the shortcomings of existing technologies, thereby improving the overall rigidity and collision safety performance of the vehicle body, while optimizing the arrangement of front compartment accessories.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A lower crossbeam assembly for the front bulkhead of an automobile body, characterized in that it comprises:

[0007] Lower crossbeam of the front bulkhead;

[0008] The front floor assembly mating surface is located on one side of the bottom of the lower crossbeam of the front bulkhead;

[0009] A sheet metal mating surface is provided between the end of the front floor assembly mating surface and the end of the front bulkhead lower crossbeam. A first reinforcing rib is provided between the sheet metal mating surface and the front bulkhead lower crossbeam. The two ends of the front bulkhead lower crossbeam extend outward to form the A-pillar inner panel mating surface. The front bulkhead lower crossbeam is provided with a right front longitudinal beam mating surface and a left front longitudinal beam mating surface on the other side of the front floor assembly mating surface. A second reinforcing rib is provided between the right front longitudinal beam mating surface and the left front longitudinal beam mating surface and the front bulkhead lower crossbeam.

[0010] Through the design of the above scheme, the lower crossbeam of the front bulkhead serves as the basic framework. It achieves a stable connection with multiple key components of the front, side, and lower parts of the vehicle body through the matching surfaces of the front floor assembly, sheet metal, A-pillar inner panel, right front longitudinal beam, and left front longitudinal beam, forming a complete load transfer network. The first reinforcing rib enhances the torsional stiffness at the connection between the sheet metal matching surface and the lower crossbeam of the front bulkhead, while the second reinforcing rib strengthens the connection between the longitudinal beam matching surface and the crossbeam body, effectively avoiding stress concentration and improving the overall structural strength and durability of the assembly.

[0011] Furthermore, the front bulkhead lower crossbeam, the front floor assembly mating surface, and the sheet metal mating surface are fitted together to form an inclined surface, and the inclined surface is provided with wiring harness box mounting holes.

[0012] Furthermore, the lower crossbeam of the front bulkhead has mounting holes for accelerator pedal bracket nuts, PKG nuts, front floor longitudinal beam bolts, and front bulkhead reinforcing plate bolts on one side near the mating surface of the front floor assembly. The front floor longitudinal beam bolts are located below the front bulkhead reinforcing plate bolts, while the accelerator pedal bracket nuts and PKG nuts are located on either side of the front floor longitudinal beam bolts and front bulkhead reinforcing plate bolts.

[0013] Furthermore, a first longitudinal energy-absorbing column and a first longitudinal energy-absorbing rib are provided between the lower crossbeam of the front bulkhead, the matching surface of the front floor assembly, and the inclined surface. The first longitudinal energy-absorbing rib is connected to the first longitudinal energy-absorbing column, the accelerator pedal bracket nut mounting hole, the PKG nut mounting hole, and the front bulkhead reinforcement plate bolt mounting hole.

[0014] Furthermore, a first bolt mounting hole with a diameter of 13-14 mm is provided on the sheet metal mating surface; a second bolt mounting hole with a diameter of 13-14 mm is provided on the A-pillar inner panel mating surface; and a third bolt mounting hole with a diameter of 13-14 mm is provided on both the right front longitudinal beam mating surface and the left front longitudinal beam mating surface.

[0015] Furthermore, between the lower crossbeam of the front bulkhead, the matching surface of the inner panel of the A-pillar and the matching surface of the right front longitudinal beam or the matching surface of the left front longitudinal beam, there are bolt mounting holes for the longitudinal beam reinforcement plate, wiring harness mounting holes, transverse energy-absorbing columns and transverse energy-absorbing ribs. The transverse energy-absorbing ribs are connected to the bolt mounting holes for the longitudinal beam reinforcement plate, the wiring harness mounting holes and the transverse energy-absorbing columns. There is a cavity partition between the matching surface of the inner panel of the A-pillar and the sheet metal matching surface. There are electrophoresis holes on the side of the lower crossbeam of the front bulkhead near the matching surface of the inner panel of the A-pillar.

[0016] Furthermore, a first heat pump mounting plate is provided on the side of the lower crossbeam of the front bulkhead near the matching surface of the right front longitudinal beam and the matching surface of the left front longitudinal beam, and a second heat pump mounting plate is provided between the matching surfaces of the lower crossbeam of the front bulkhead and the right front longitudinal beam. The first heat pump mounting plate and the second heat pump mounting plate are respectively provided with a first heat pump mounting hole and a second heat pump mounting hole.

[0017] Furthermore, a second longitudinal energy-absorbing column, a battery pack water inlet pipe mounting hole, and a second longitudinal energy-absorbing rib are provided on the side of the lower crossbeam of the front bulkhead near the matching surface of the right front longitudinal beam and the matching surface of the left front longitudinal beam. The second longitudinal energy-absorbing rib is connected to the second longitudinal energy-absorbing column and the battery pack water inlet pipe mounting hole, and a high-voltage wire harness bracket mounting limit hole is provided on the second longitudinal energy-absorbing rib.

[0018] Furthermore, the bottom of the front floor assembly mating surface is provided with a vertical energy-absorbing column, a front subframe assembly mounting hole, a vertical energy-absorbing rib, a skid positioning hole, a mudguard mounting hole, a fuel tank line mounting hole, and an air conditioning line mounting hole. The vertical energy-absorbing rib is connected to the vertical energy-absorbing column, the front subframe assembly mounting hole, the mudguard mounting hole, the fuel tank line mounting hole, and the air conditioning line mounting hole.

[0019] Furthermore, it also includes a right front longitudinal beam reinforcement plate, which is bolted to the bottom of the front floor assembly mating surface and located on the side close to the left front longitudinal beam mating surface.

[0020] The present invention, by adopting the above-described technical solution, has the following beneficial effects:

[0021] 1. This invention constructs a three-dimensional reinforced structure by rationally setting a first reinforcing rib, a second reinforcing rib, a longitudinal energy-absorbing column / rib, a transverse energy-absorbing column / rib, and a vertical energy-absorbing column / rib between the lower crossbeam of the front bulkhead and each matching surface. This significantly improves the overall rigidity and torsional resistance of the assembly, effectively avoids stress concentration, and extends the fatigue life of the components.

[0022] 2. This invention utilizes a multi-directional (longitudinal, transverse, and vertical) energy-absorbing structure to form a comprehensive collision energy absorption and dispersion network, ensuring that collision forces can be efficiently absorbed and rapidly transferred to the vehicle frame under conditions such as frontal, side, and offset collisions, effectively protecting the integrity of the passenger compartment.

[0023] 3. This invention integrates the mounting points of numerous accessories, such as the accelerator pedal bracket, PKG bracket, wiring harness box, front subframe, heat pump system, battery pack water inlet pipe, high-voltage wiring harness, fuel tank pipeline and air conditioning pipeline, onto the lower crossbeam assembly of the front bulkhead. This greatly optimizes the space utilization of the front compartment and the front of the chassis, reduces the number of brackets, simplifies the final assembly process, and improves production and assembly efficiency.

[0024] 4. The electrophoresis hole design of this invention ensures the quality of the internal film on the assembly during the coating process, thus improving corrosion resistance. The bolt mounting holes on each mating surface use an optimized, uniform diameter, which ensures assembly tolerance compensation and improves connection reliability. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] Figure 1 This is a rendering of the lower crossbeam assembly of the front bulkhead of an automobile body according to the present invention;

[0027] Figure 2 for Figure 1 A magnified view of a section at point I;

[0028] Figure 3 for Figure 1 Rendering of direction A in the middle;

[0029] Figure 4 for Figure 3 The rendering of the B direction.

[0030] In the diagram: 1-Lower crossbeam of the front bulkhead; 2-Matching surface of the front floor assembly; 3-Matching surface of the right front longitudinal beam; 4-Inclined surface; 5-Hole harness box mounting hole; 6-Sheet metal mating surface; 7-First bolt mounting hole; 8-Matching surface of the A-pillar inner panel; 9-Second bolt mounting hole; 10-Matching surface of the left front longitudinal beam; 11-First reinforcing rib; 12-Right front longitudinal beam reinforcing plate; 13-Accelerator pedal bracket nut mounting hole; 14-PKG nut mounting hole; 15-First longitudinal energy-absorbing column; 16-Bolt mounting hole of the front bulkhead reinforcing plate; 17-First longitudinal energy-absorbing rib; 18-Second reinforcing rib; 19-First heat pump mounting plate; 20-First heat pump mounting hole; 21-Bolt mounting hole of the longitudinal beam reinforcing plate; 22-Hole harness mounting hole; 23- 24-Transverse energy-absorbing column; 25-Cavity partition; 26-Third bolt mounting hole; 27-Second heat pump mounting plate; 28-Second heat pump mounting hole; 29-Second longitudinal energy-absorbing column; 30-Battery pack water inlet pipe mounting hole; 31-Second longitudinal energy-absorbing rib; 32-Vertical energy-absorbing column; 33-Front subframe assembly mounting hole; 34-Vertical energy-absorbing rib; 35-Electrophoresis hole; 36-Front floor longitudinal beam bolt mounting hole; 37-Skipper positioning hole; 38-Mud flap mounting hole; 39-Fuel tank pipe mounting hole; 40-Air conditioning pipe mounting hole; 41-High voltage wiring harness bracket mounting limit hole; 42-Front bulkhead left reinforcement sheet metal nut mounting hole; 43-Front bulkhead right reinforcement sheet metal nut mounting hole; 44-Handle hole. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0034] like Figures 1 to 4 As shown, the present invention is a lower crossbeam assembly for the front bulkhead of an automobile body, including a lower crossbeam 1 and a matching surface 2 for the front floor assembly.

[0035] The front floor assembly matching surface 2 is located on one side of the bottom of the lower crossbeam 1 of the front bulkhead.

[0036] A sheet metal mating surface 6 is provided between the end of the front floor assembly mating surface 2 and the end of the front bulkhead lower crossbeam 1. A first reinforcing rib 11 is provided between the sheet metal mating surface 6 and the front bulkhead lower crossbeam 1. The two ends of the front bulkhead lower crossbeam 1 extend outward to form the A-pillar inner panel mating surface 8. The front bulkhead lower crossbeam 1 is located on the other side of the front floor assembly mating surface 2 and is provided with a right front longitudinal beam mating surface 3 and a left front longitudinal beam mating surface 10. A second reinforcing rib 18 is provided between the right front longitudinal beam mating surface 3 and the left front longitudinal beam mating surface 10 and the front bulkhead lower crossbeam 1.

[0037] An inclined surface 4 is formed between the lower crossbeam 1 of the front bulkhead, the mating surface 2 of the front floor assembly, and the sheet metal mating surface 6. A wiring harness box mounting hole 5 is provided on the inclined surface 4. The inclined surface 4 fully utilizes the transition area between the lower crossbeam 1 of the front bulkhead and the mating surface of the floor assembly, providing a dedicated mounting surface for the wiring harness box. This ensures a stable mounting position for the wiring harness box without occupying additional interior or engine compartment space. The wiring harness box mounting hole 5 facilitates quick positioning and fastening of the wiring harness box, improving assembly efficiency. It also promotes the neat arrangement of the wiring harness and avoids interference between the wiring harness and surrounding moving or high-temperature components.

[0038] The lower crossbeam 1 of the front bulkhead has mounting holes 13 for the accelerator pedal bracket nut, 14 for the PKG nut, 36 for the front floor longitudinal beam bolt, and 16 for the front bulkhead reinforcing plate bolt on one side near the mating surface 2 of the front floor assembly. The front floor longitudinal beam bolt mounting hole 36 is located below the front bulkhead reinforcing plate bolt mounting hole 16, while the accelerator pedal bracket nut mounting hole 13 and the PKG nut mounting hole 14 are located on either side of the front floor longitudinal beam bolt mounting hole 36 and the front bulkhead reinforcing plate bolt mounting hole 16. The integrated and compact arrangement of the mounting holes on the lower crossbeam 1 of the front bulkhead allows multiple accessories such as the accelerator pedal bracket, PKG, front floor longitudinal beam, and front bulkhead reinforcing plate to be installed in the same area, reducing the space occupied by the dispersed arrangement of components. At the same time, the positional relationship of each mounting hole has been optimized to avoid interference between each other during installation, and it is also beneficial to improve the local rigidity and installation reliability of the lower crossbeam 1 of the front bulkhead in this area.

[0039] A first longitudinal energy-absorbing column 15 and a first longitudinal energy-absorbing rib 17 are provided between the lower crossbeam 1 of the front bulkhead, the mating surface 2 of the front floor assembly, and the inclined surface 4. The first longitudinal energy-absorbing rib 17 is connected to the first longitudinal energy-absorbing column 15, the accelerator pedal bracket nut mounting hole 13, the PKG nut mounting hole 14, and the front bulkhead reinforcement plate bolt mounting hole 16. The first longitudinal energy-absorbing column 15 and the first longitudinal energy-absorbing rib 17 form a longitudinal reinforcement and energy-absorbing structure in this area. When the vehicle is involved in a frontal collision, the impact force can be transmitted to the lower crossbeam 1 of the front bulkhead via the front longitudinal beam, and effectively absorbed and dispersed by these longitudinally arranged energy-absorbing columns and ribs, transferring the energy to a wider range of the vehicle body structure. At the same time, connecting multiple mounting holes with energy-absorbing ribs also enhances the structural rigidity of the mounting points and prevents tearing of the mounting points under impact loads.

[0040] The sheet metal mating surface 6 has a first bolt mounting hole 7 with a diameter of 13-14 mm. The A-pillar inner panel mating surface 8 has a second bolt mounting hole 9 with a diameter of 13-14 mm. The right front longitudinal beam mating surface 3 and the left front longitudinal beam mating surface 10 both have a third bolt mounting hole 26 with a diameter of 13-14 mm. This design provides sufficient hole diameter allowance to compensate for tolerances during body welding and assembly, ensuring smooth assembly of all components. It also avoids reduced connection strength or sealing difficulties caused by excessively large hole diameters. The standardized hole diameter also reduces the need for adjusting fastening tools on the production line, improving assembly efficiency.

[0041] Between the lower crossbeam 1 of the front bulkhead, the mating surface 8 of the A-pillar inner panel, and the mating surface 3 of the right front longitudinal beam or the mating surface 10 of the left front longitudinal beam, there are bolt mounting holes 21 for the longitudinal beam reinforcement plate, mounting holes 22 for the wiring harness, transverse energy-absorbing columns 23, and transverse energy-absorbing ribs 24. The transverse energy-absorbing ribs 24 are connected to the bolt mounting holes 21, the wiring harness mounting holes 22, and the transverse energy-absorbing columns 23. A cavity partition 25 is provided between the mating surface 8 of the A-pillar inner panel and the sheet metal mating surface 6. An electrophoresis hole 35 is provided on the side of the lower crossbeam 1 of the front bulkhead near the mating surface 8 of the A-pillar inner panel. The transverse energy-absorbing columns 23 and the energy-absorbing ribs form a transverse reinforcement and energy absorption structure on both sides of the assembly, effectively improving the ability to resist side impacts and torsion. The transverse energy-absorbing ribs 24 connect the mounting holes of the longitudinal beam reinforcement plate, the wiring harness mounting holes 22, and the energy-absorbing columns into one unit, which not only enhances the rigidity of the mounting points but also optimizes the force transmission path. The cavity partition 25 effectively blocks the transmission path of noise and heat within the cavity, improving the vehicle's NVH performance and air conditioning efficiency. The electrophoresis holes 35 ensure that the inner cavity area of ​​the lower crossbeam 1 of the front bulkhead can fully contact the electrophoretic liquid during the electrophoretic coating process, forming a uniform and dense anti-corrosion coating and improving the corrosion resistance of the assembly.

[0042] A first heat pump mounting plate 19 is provided on the side of the lower crossbeam 1 of the front bulkhead near the mating surface 3 of the right front longitudinal beam and the mating surface 10 of the left front longitudinal beam. A second heat pump mounting plate 27 is provided between the lower crossbeam 1 of the front bulkhead and the mating surface 3 of the right front longitudinal beam. The first heat pump mounting plate 19 and the second heat pump mounting plate 27 are respectively provided with a first heat pump mounting hole 20 and a second heat pump mounting hole 28. By setting the first heat pump mounting plate 19 and the second heat pump mounting plate 27, multiple dispersed and high-rigidity mounting points are provided for the front of the heat pump system, which helps to evenly transfer the weight and vibration load of the heat pump system to the mating surfaces of the lower crossbeam 1 of the front bulkhead and the longitudinal beam, avoiding stress concentration. At the same time, this mounting structure provides the necessary space for the arrangement of heat pump pipes and wiring harnesses, which facilitates the assembly and maintenance of the heat pump system.

[0043] The lower crossbeam 1 of the front bulkhead is equipped with a second longitudinal energy-absorbing column 29, a battery pack water inlet pipe mounting hole 30, and a second longitudinal energy-absorbing rib 31 on the side near the matching surface 3 of the right front longitudinal beam and the matching surface 10 of the left front longitudinal beam. The second longitudinal energy-absorbing rib 31 is connected to the second longitudinal energy-absorbing column 29 and the battery pack water inlet pipe mounting hole 30, and has a high-voltage wiring harness bracket mounting limit hole 41. The second longitudinal energy-absorbing column 29 and the energy-absorbing rib further enhance the longitudinal strength and energy absorption capacity of the area where the lower crossbeam 1 of the front bulkhead connects to the matching surface of the longitudinal beam, ensuring that collision energy can be effectively dispersed along multiple paths. The battery pack water inlet pipe mounting hole 30 provides a dedicated fixing point for the battery cooling pipe of the new energy vehicle; the high-voltage wiring harness bracket mounting limit hole 41 facilitates the accurate installation and positioning of the high-voltage wiring harness bracket, preventing the high-voltage wiring harness from rubbing or interfering with surrounding components due to vibration or displacement, thus improving the safety of the high-voltage system.

[0044] The bottom of the front floor assembly mating surface 2 is provided with vertical energy-absorbing columns 32, front subframe assembly mounting holes 33, vertical energy-absorbing ribs 34, skid positioning holes 37, mudguard mounting holes 38, fuel tank line mounting holes 39, and air conditioning line mounting holes 40. The vertical energy-absorbing ribs 34 are connected to the vertical energy-absorbing columns 32, front subframe assembly mounting holes 33, mudguard mounting holes 38, fuel tank line mounting holes 39, and air conditioning line mounting holes 40. The vertical energy-absorbing columns 32 and energy-absorbing ribs at the bottom of the front floor assembly mating surface 2 effectively improve the stiffness and energy absorption capacity of the lower structure of the assembly under vertical loads, and enhance the structural integrity of the vehicle when encountering road impacts or bottoming out. This area integrates multiple mounting points such as the front subframe mounting holes, skid positioning holes 37, mudguards, fuel tank lines, and air conditioning lines, achieving a highly integrated design; the vertical energy-absorbing ribs 34 connect these key mounting points into one, significantly improving the local rigidity and positional accuracy of each mounting point, and ensuring the installation reliability of the chassis and piping system.

[0045] It also includes a right front longitudinal beam reinforcement plate 12, which is bolted to the bottom of the front floor assembly mating surface 2 and located on the side close to the left front longitudinal beam mating surface 10. The addition of the right front longitudinal beam reinforcement plate 12 provides targeted local reinforcement to the strength and stiffness of the left longitudinal beam mating area, effectively balancing the stiffness difference that may be caused by the asymmetry of the left and right structures of the assembly, further optimizing the load transfer uniformity of the overall structure, and improving the fatigue resistance and collision safety of this key connection area.

[0046] The top of the lower crossbeam 1 of the front bulkhead is provided with a front bulkhead left reinforcing sheet metal nut mounting hole 42, a front bulkhead right reinforcing sheet metal nut mounting hole 43 and a grab hole 44. The front bulkhead left reinforcing sheet metal nut mounting hole 42 and the grab hole 44 are close to the left front longitudinal beam matching surface 10, and the front bulkhead right reinforcing sheet metal nut mounting hole 43 and the grab hole 44 are close to the right front longitudinal beam matching surface 3.

[0047] Through the design of the above scheme, the lower crossbeam 1 of the front bulkhead serves as the basic frame, achieving a stable connection with multiple key components of the front, side, and lower parts of the vehicle body through the matching surface 2 of the front floor assembly, the matching surface 6 of the sheet metal, the matching surface 8 of the A-pillar inner panel, the matching surface 3 of the right front longitudinal beam, and the matching surface 10 of the left front longitudinal beam, thus forming a complete load transfer network. The first reinforcing rib 11 enhances the torsional stiffness at the connection between the sheet metal matching surface 6 and the lower crossbeam 1 of the front bulkhead, while the second reinforcing rib 18 strengthens the connection strength between the longitudinal beam matching surface and the crossbeam body, effectively avoiding stress concentration and improving the overall structural strength and durability of the assembly.

[0048] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to achieve substantially the same technical effect are all covered within the protection scope of the present invention.

Claims

1. A lower crossbeam assembly for the front bulkhead of an automobile body, characterized in that, include: Lower crossbeam of the front bulkhead; The front floor assembly mating surface is located on one side of the bottom of the lower crossbeam of the front bulkhead; A sheet metal mating surface is provided between the end of the front floor assembly mating surface and the end of the front bulkhead lower crossbeam. A first reinforcing rib is provided between the sheet metal mating surface and the front bulkhead lower crossbeam. The two ends of the front bulkhead lower crossbeam extend outward to form the A-pillar inner panel mating surface. The front bulkhead lower crossbeam is provided with a right front longitudinal beam mating surface and a left front longitudinal beam mating surface on the other side of the front floor assembly mating surface. A second reinforcing rib is provided between the right front longitudinal beam mating surface and the left front longitudinal beam mating surface and the front bulkhead lower crossbeam.

2. The lower crossbeam assembly for the front bulkhead of an automobile body according to claim 1, characterized in that: The lower crossbeam of the front bulkhead, the matching surface of the front floor assembly, and the matching surface of the sheet metal are fitted together to form an inclined surface, and a wiring harness box mounting hole is provided on the inclined surface.

3. The lower crossbeam assembly for the front bulkhead of an automobile body according to claim 2, characterized in that: The lower crossbeam of the front bulkhead has mounting holes for an accelerator pedal bracket nut, a PKG nut, a front floor longitudinal beam bolt, and a front bulkhead reinforcing plate on one side near the mating surface of the front floor assembly. The front floor longitudinal beam bolt mounting holes are located below the front bulkhead reinforcing plate bolt mounting holes, and the accelerator pedal bracket nut and PKG nut mounting holes are located on both sides of the front floor longitudinal beam bolt mounting holes and the front bulkhead reinforcing plate bolt mounting holes.

4. The lower crossbeam assembly for the front bulkhead of an automobile body according to claim 3, characterized in that: A first longitudinal energy-absorbing column and a first longitudinal energy-absorbing rib are provided between the lower crossbeam of the front bulkhead, the matching surface of the front floor assembly, and the inclined surface. The first longitudinal energy-absorbing rib is connected to the first longitudinal energy-absorbing column, the accelerator pedal bracket nut mounting hole, the PKG nut mounting hole, and the front bulkhead reinforcement plate bolt mounting hole.

5. The lower crossbeam assembly for the front bulkhead of an automobile body according to claim 2, characterized in that: The sheet metal mating surface is provided with a first bolt mounting hole with a diameter of 13-14 mm. The A-pillar inner panel mating surface is provided with a second bolt mounting hole with a diameter of 13-14 mm. The right front longitudinal beam mating surface and the left front longitudinal beam mating surface are both provided with a third bolt mounting hole with a diameter of 13-14 mm.

6. The lower crossbeam assembly for the front bulkhead of an automobile body according to claim 1, characterized in that: Between the lower crossbeam of the front bulkhead, the matching surface of the inner panel of the A-pillar and the matching surface of the right front longitudinal beam or the matching surface of the left front longitudinal beam, there are bolt mounting holes for longitudinal beam reinforcement plates, wiring harness mounting holes, transverse energy-absorbing columns and transverse energy-absorbing ribs. The transverse energy-absorbing ribs are connected to the bolt mounting holes for longitudinal beam reinforcement plates, the wiring harness mounting holes and the transverse energy-absorbing columns. A cavity partition is provided between the matching surface of the inner panel of the A-pillar and the matching surface of the sheet metal. An electrophoresis hole is provided on the side of the lower crossbeam of the front bulkhead near the matching surface of the inner panel of the A-pillar.

7. The lower crossbeam assembly for the front bulkhead of an automobile body according to claim 1, characterized in that: A first heat pump mounting plate is provided on the side of the lower crossbeam of the front bulkhead near the matching surface of the right front longitudinal beam and the matching surface of the left front longitudinal beam. A second heat pump mounting plate is provided between the matching surfaces of the lower crossbeam of the front bulkhead and the right front longitudinal beam. The first heat pump mounting plate and the second heat pump mounting plate are respectively provided with a first heat pump mounting hole and a second heat pump mounting hole.

8. The lower crossbeam assembly for the front bulkhead of an automobile body according to claim 1, characterized in that: The lower crossbeam of the front bulkhead is provided with a second longitudinal energy-absorbing column, a battery pack water inlet pipe mounting hole, and a second longitudinal energy-absorbing rib on the side near the matching surface of the right front longitudinal beam and the matching surface of the left front longitudinal beam. The second longitudinal energy-absorbing rib is connected to the second longitudinal energy-absorbing column and the battery pack water inlet pipe mounting hole, and a high-voltage wire harness bracket mounting limit hole is provided on the second longitudinal energy-absorbing rib.

9. The lower crossbeam assembly for the front bulkhead of an automobile body according to claim 1, characterized in that: The bottom of the front floor assembly mating surface is provided with a vertical energy-absorbing column, a front subframe assembly mounting hole, a vertical energy-absorbing rib, a skid positioning hole, a mudguard mounting hole, a fuel tank line mounting hole, and an air conditioning line mounting hole. The vertical energy-absorbing rib is connected to the vertical energy-absorbing column, the front subframe assembly mounting hole, the mudguard mounting hole, the fuel tank line mounting hole, and the air conditioning line mounting hole.

10. The lower crossbeam assembly for the front bulkhead of an automobile body according to claim 1, characterized in that: It also includes a right front longitudinal beam reinforcement plate, which is bolted to the bottom of the front floor assembly mating surface and located on the side close to the left front longitudinal beam mating surface.

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