Reinforcing structure for lower end of A pillar of vehicle body

Abstract

The utility model discloses a vehicle body A column lower end reinforcing structure which comprises an A column lower end inner plate, and a bending part connected with a doorsill inner plate is arranged at the bottom of the A column lower end inner plate. An inner plate at the lower end of the column A is provided with a containing groove, and a reinforcing plate is arranged in the containing groove; a bottom flange is arranged at the lower end of the reinforcing plate and fixedly connected with the threshold inner plate. The bending part is arranged at the bottom of the A column lower end inner plate and fixedly connected with the threshold inner plate, so that the connecting strength of the A column lower end and the threshold is effectively enhanced, the deformation of the A column lower end during collision is reduced, and the integrity of a passenger living space is guaranteed; the reinforcing plate is of a box-shaped structure and forms a cavity together with the inner plate at the lower end of the A column, so that the section inertia moment of the lower end of the A column is increased, the force transmission path is improved, impact force generated during collision can be more uniformly and effectively dispersed into the whole vehicle body structure, local stress concentration is reduced, and the collision safety is improved. And the collision safety performance of the vehicle is obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle body structures, and particularly relates to a reinforcing structure at the lower end of a vehicle body A-pillar. Background Art

[0002] In the design of passenger cars, the A-pillar, as an indispensable bridge between the front cabin and the passenger cabin, its structural strength and stability are directly related to the guarantee of the survival space of the occupants during a frontal collision of the vehicle. The performance of the A-pillar in a collision not only affects the safety space of the passengers inside the vehicle, but also directly relates to whether the door can be opened smoothly after the collision, thus determining whether the occupants can evacuate quickly in an emergency.

[0003] To enhance the rigidity and load-bearing capacity of the A-pillar, a strategy of adding a U-shaped bracket inside the A-pillar is often adopted, and the lateral or longitudinal layout of the bracket is used to strengthen the supporting force of the A-pillar in the X direction. However, although this strengthening method has a certain effect, it fails to comprehensively solve the problem of poor force transmission efficiency at the lower end of the A-pillar. Especially in the face of a frontal collision, especially in the extreme working condition of a small overlap collision, the lower end of the A-pillar needs to bear huge impact energy. If the structural design of this area is not strong enough, although some energy can be absorbed through appropriate collapse, excessive deformation may directly invade the driver's cab, seriously threatening the lives of the occupants. Summary of the Invention

[0004] The purpose of the utility model is to provide a reinforcing structure at the lower end of a vehicle body A-pillar to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A reinforcing structure at the lower end of a vehicle body A-pillar includes an inner panel at the lower end of the A-pillar; a bent portion is provided at the bottom of the inner panel at the lower end of the A-pillar, and the bent portion extends towards the inner panel of the sill and is fixedly connected thereto; a receiving groove is provided in the inner panel at the lower end of the A-pillar, and a reinforcing plate is provided in the receiving groove; the reinforcing plate has a box-shaped structure, and a cavity is formed between the reinforcing plate and the bottom of the receiving groove; a bottom flanging is provided at the lower end of the reinforcing plate, and the bottom flanging is fixedly connected to the inner panel of the sill.

[0007] Preferably, the inner panel at the lower end of the A-pillar is made of a high-strength fiber material, and a number of reinforcing ribs are provided in the receiving groove of the inner panel at the lower end of the A-pillar, and the reinforcing ribs form a grid-like structure.

[0008] Preferably, a reinforcing column is provided at the connection between the reinforcing rib and the inner side wall of the receiving groove.

[0009] Preferably, both sides of the reinforcing plate are respectively folded towards both sides to form connection ends, and the connection ends are welded to the bottom of the receiving groove.

[0010] Preferably, two groups of reinforcing grooves are arranged on the reinforcing plate along its length direction.

[0011] Preferably, the reinforcing plate is made of high-strength composite fiber material, and the thickness of the reinforcing plate is 2-3 mm.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: By arranging a bending part at the bottom of the inner plate at the lower end of the A-pillar and fixedly connecting it to the inner plate of the sill, the connection strength between the lower end of the A-pillar and the sill is effectively enhanced, and the deformation amount of the lower end of the A-pillar during a collision is reduced, thereby ensuring the integrity of the passenger survival space; The reinforcing plate has a box-shaped structure and forms a cavity together with the inner plate at the lower end of the A-pillar. This design not only increases the sectional moment of inertia of the lower end of the A-pillar but also improves the force transmission path, enabling the impact force generated during a collision to be more evenly and effectively dispersed to the entire body structure, reducing local stress concentration; The bottom flanging at the lower end of the reinforcing plate is fixedly connected to the inner plate of the sill, further strengthening the connection between the lower end of the A-pillar and the sill, improving the overall rigidity and torsional strength of the structure, and making the A-pillar more stable and reliable during a collision; Using high-strength fiber material and composite fiber material to manufacture the inner plate at the lower end of the A-pillar and the reinforcing plate not only ensures the strength and stiffness requirements of the structure but also realizes the lightweight of the material, which is beneficial to improving the fuel economy and environmental protection performance of the vehicle; By arranging criss-crossing reinforcing ribs in the accommodating groove of the inner plate at the lower end of the A-pillar and arranging reinforcing columns at the connection between the reinforcing ribs and the inner side wall of the accommodating groove, the bearing capacity and anti-deformation ability of the structure are further improved; At the same time, the reinforcing grooves arranged on the reinforcing plate also enhance its own strength, making the entire reinforcing structure more durable, effectively solving the problems of poor force transmission effect and excessive deformation existing in the traditional A-pillar strengthening scheme, and significantly improving the collision safety performance of the vehicle. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the connection between the inner plate at the lower end of the A-pillar and the inner plate of the sill of the present utility model;

[0014] Figure 2 is a front view structural diagram of the connection between the inner plate at the lower end of the A-pillar and the inner plate of the sill of the present utility model;

[0015] Figure 3 is a schematic structural diagram of the inner plate at the lower end of the A-pillar of the present utility model;

[0016] Figure 4 is a schematic structural diagram of the bottom of the inner plate at the lower end of the A-pillar of the present utility model;

[0017] Figure 5a 、 5b is a schematic structural diagram of the reinforcing plate of the present utility model.

[0018] Wherein: 1. Inner panel at the lower end of the A-pillar; 2. Bent portion; 3. Inner panel of the sill; 4. Accommodating groove; 5. Reinforcing plate; 6. Bottom flanging; 7. Reinforcing rib; 8. Reinforcing column; 9. Connection end; 10. Reinforcing groove. Detailed implementation manner

[0019] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0020] Please refer to Figure 1 to Fig. 5. To achieve the above object, the present utility model provides the following technical solutions:

[0021] A reinforcing structure at the lower end of the vehicle body A-pillar includes an inner panel 1 at the lower end of the A-pillar; a bent portion 2 is provided at the bottom of the inner panel 1 at the lower end of the A-pillar, wherein the bent portion 2 extends toward the inner panel 3 of the sill and is fixedly connected thereto; an accommodating groove 4 is provided on the inner panel 1 at the lower end of the A-pillar, and a reinforcing plate 5 is provided in the accommodating groove 4; the reinforcing plate 5 has a box-shaped structure, and a cavity is formed between the reinforcing plate 5 and the bottom of the accommodating groove 4; a bottom flanging 6 is provided at the lower end of the reinforcing plate 5, and the bottom flanging 6 is fixedly connected to the inner panel 3 of the sill.

[0022] The inner panel 1 at the lower end of the A-pillar is manufactured by a stamping process to ensure its shape accuracy and surface quality, and special attention is paid to the precise forming of the bent portion to ensure good fit with the inner panel 3 of the sill; the reinforcing plate 5 is designed with a box-shaped structure, the reinforcing plate 5 is accurately placed in the accommodating groove 4 of the inner panel 1 at the lower end of the A-pillar, and is fixed by welding to ensure a tight combination between the two, forming a closed or semi-closed cavity structure to improve its bending and torsion resistance; the bent portion 2 of the inner panel 1 at the lower end of the A-pillar is accurately aligned with the inner panel 3 of the sill and fixed by welding or bolt connection to ensure the connection strength and stability; the bottom flanging of the reinforcing plate 5 is fixedly connected to the inner panel 3 of the sill to further enhance the rigidity and stability of the overall structure, ensuring that the design, manufacture, and installation of the reinforcing structure at the lower end of the vehicle body A-pillar meet the predetermined requirements and standards, effectively improving the safety and performance of the vehicle.

[0023] Please refer to Figure 2 、 Figure 3 , as an embodiment of the present utility model, the inner panel 1 at the lower end of the A-pillar is made of a high-strength fiber material, and a plurality of criss-crossing reinforcing ribs 7 are provided in the accommodating groove 4 of the inner panel 1 at the lower end of the A-pillar, and the reinforcing ribs 7 form a grid-like structure; a reinforcing column 8 is provided at the connection between the reinforcing rib 7 and the inner side wall of the accommodating groove 4, and the reinforcing rib 7 and the reinforcing column 8 are integrally provided.

[0024] In the above-described solution, for the inner panel 1 at the lower end of the A-pillar, according to the design requirements, fiber materials with high strength, high modulus, good impact resistance and corrosion resistance are selected, such as carbon fiber, glass fiber, etc.; according to the force analysis and strength requirements of the inner panel 1 at the lower end of the A-pillar, the layout of the criss-cross reinforcing ribs 7 and reinforcing columns 8 is designed. Among them, the reinforcing ribs 7 should be reasonably distributed to form an effective grid-like structure, and the reinforcing columns 8 cooperate with the reinforcing ribs 7 to maximize the rigidity and load-bearing capacity of the inner panel 1 at the lower end of the A-pillar; determine the thickness, width, height of the reinforcing ribs 7 and the spacing between them to ensure that while meeting the strength requirements, the weight is minimized as much as possible, in line with the trend of vehicle body lightweighting; according to the shape and size requirements of the inner panel 1 at the lower end of the A-pillar, the reinforcing ribs 7 and the reinforcing columns 8, design a special mold. The mold should have good forming accuracy and surface quality to ensure the dimensional accuracy and appearance quality of the product; use high-precision manufacturing processes such as CNC machining and electric discharge machining to manufacture the mold, and carry out necessary debugging and inspection to ensure that the mold meets the design requirements; mix the resin and the curing agent evenly in a certain proportion, and then impregnate the pretreated fiber material in the resin to make the resin fully penetrate between the fibers; put the impregnated fiber material into the mold, and through processes such as heating and pressurization, the resin is cured and formed. During this process, the reinforcing ribs 7, the reinforcing columns 8 and the inner panel 1 at the lower end of the A-pillar are integrally formed to form a composite material product with a grid-like structure; by connecting and installing the strengthened inner panel 1 at the lower end of the A-pillar with other vehicle body components, the integrity and stability of the entire vehicle body structure are ensured, thereby effectively improving the rigidity and safety of the vehicle body.

[0025] Please refer to Figure 3 and Figure 5a , 5b , as an embodiment of the present utility model, both sides of the reinforcing plate 5 are folded outwards to form connection ends 9, and the connection ends 9 are welded to the bottom of the receiving groove 4.

[0026] In the above-described solution, according to the design drawings, the reinforcing plate 5 is processed into the required size. The two sides of the reinforcing plate 5 are respectively folded outward by using a bending device to form the connecting ends 9. Pay attention to controlling the folding angle and precision to ensure that the connecting ends 9 can closely fit with the bottom of the receiving groove 4, and perform surface treatment on the reinforcing plate 5 and its connecting ends 9. By placing the reinforcing plate 5 in the receiving groove 4, ensure that the connecting ends 9 are aligned with the bottom of the receiving groove 4, and use a fixture or positioning device to fix the reinforcing plate 5 to prevent it from moving during the welding process. Select a suitable welding method and welding parameters according to the welding process requirements, and use a welding torch or welding machine to weld the connecting ends 9 and the bottom of the receiving groove 4. Pay attention to controlling the welding speed and welding temperature to ensure the weld quality. During the welding process, keep the stability of the welding torch or welding machine to avoid generating welding defects. Conduct quality inspection on the welded reinforcing plate 5, including size inspection, appearance inspection, etc.; thereby ensuring that the welding between the reinforcing plate 5 and the bottom of the receiving groove 4 is firm and reliable, meeting the design requirements and usage needs.

[0027] Please refer to Figure 5a 、 5b , as an embodiment of the present utility model, two groups of reinforcing grooves 10 are arranged along the length direction of the reinforcing plate 5.

[0028] In the above-described solution, by arranging the reinforcing grooves 10 on the reinforcing plate 5, its own strength is greatly enhanced, making the entire reinforcing structure more durable; when designing the reinforcing grooves 10, it is necessary to consider their influence on the overall strength and stiffness of the reinforcing plate 5 to ensure that while meeting the strengthening effect, the overall structure of the reinforcing plate is not damaged; the processing of the reinforcing grooves 10 should precisely control the depth, width and shape to avoid excessive stress concentration or damage to the structure of the reinforcing plate 5.

[0029] Please refer to Figure 5a 、 5b , as an embodiment of the present utility model, the reinforcing plate 5 is made of a high-strength composite fiber material, and the thickness of the reinforcing plate 5 is 2 - 3 mm.

[0030] In the above-described solution, by selecting a high-strength composite fiber material as the material for manufacturing the reinforcement plate 5, not only the strength and stiffness requirements of the reinforcement plate structure are ensured, but also the weight reduction of the material is achieved, which is beneficial to improving the overall performance of the vehicle. The thickness range of the reinforcement plate 5 is controlled within 2-3 mm to balance the material usage and performance requirements; the CAE software is used for simulation analysis to simulate the stress conditions of the reinforcement plate 5 under different working conditions, and to verify the rationality and effectiveness of the design; the influence of the reinforcement plate 5 on the overall strength and stiffness of the inner panel 1 at the lower end of the A-pillar is analyzed to ensure that the reinforcement effect of the reinforcement plate 5 reaches the expected goal; the reinforcement plate 5 is placed in the accommodation groove 4 to ensure that it is in close contact with the bottom of the accommodation groove 4, and according to the design requirements, the reinforcement plate 5 is fixed in the accommodation groove 4 by a welding connection method, which improves the overall rigidity and torsional strength of the structure, makes the A-pillar more stable and reliable in a collision, and significantly improves the collision safety performance of the vehicle.

[0031] Although the specific implementation manners of the present invention have been described above, those skilled in the art should understand that these are only examples. The protection scope of the present invention is defined by the appended claims. Without departing from the principle and essence of the present invention, those skilled in the art can make various changes or modifications to these implementation manners, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A lower end strengthening structure of a vehicle body A-pillar, comprising an inner panel (1) at the lower end of the A-pillar; characterized in that, The bottom of the inner panel (1) at the lower end of the A-pillar is provided with a bent portion (2), wherein the bent portion (2) extends towards the inner panel (3) of the sill and is fixedly connected thereto; the inner panel (1) at the lower end of the A-pillar is provided with a receiving groove (4), and a reinforcing plate (5) is arranged in the receiving groove (4); the reinforcing plate (5) has a box-shaped structure, and a cavity is formed between the reinforcing plate (5) and the bottom of the receiving groove (4); a bottom flanging (6) is arranged at the lower end of the reinforcing plate (5), and the bottom flanging (6) is fixedly connected to the inner panel (3) of the sill.

2. The lower end strengthening structure of a vehicle body A-pillar according to claim 1, characterized in that, The inner panel (1) at the lower end of the A-pillar is made of a high-strength fiber material, and a plurality of criss-crossing reinforcing ribs (7) are arranged in the receiving groove (4) of the inner panel (1) at the lower end of the A-pillar, and the reinforcing ribs (7) form a grid-like structure.

3. The lower end strengthening structure of the vehicle body A-pillar according to claim 2, characterized in that, Reinforcing columns (8) are arranged at the joints of the reinforcing ribs (7) and the inner side walls of the receiving groove (4).

4. The lower end strengthening structure of a vehicle body A-pillar according to claim 1, characterized in that, Both side edges of the reinforcing plate (5) are folded towards both sides to form connecting ends (9), and the connecting ends (9) are welded to the bottom of the receiving groove (4).

5. The strengthening structure at the lower end of the vehicle body A-pillar according to claim 4, characterized in that Two groups of reinforcing grooves (10) are arranged along the length direction of the reinforcing plate (5).

6. The lower end strengthening structure of a vehicle body A-pillar according to claim 5, characterized in that, The reinforcing plate (5) is made of a high-strength composite fiber material, and the thickness of the reinforcing plate (5) is 2 - 3 mm.

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