CN111439310A - A skeleton structure for improving rear collision safety performance - Google Patents

Abstract

The invention discloses a skeleton structure for improving rear impact safety performance, comprising a beam frame assembly on which an underfloor beam is fixed by welding, and a rear right rear floor longitudinal beam is arranged on the underfloor beam. and the rear section of the left rear floor longitudinal beam, the rear section of the floor longitudinal beam is fixed on the under-floor beam by welding, and the right under-floor beam extension plate and the left under-floor beam extension plate are arranged on the under-floor beam. The right rear floor longitudinal beam is fixed on the top of the rear section of the right rear floor longitudinal beam by welding, and the left rear floor longitudinal beam is fixed on the top of the rear section of the left rear floor longitudinal beam by welding. The left and right sides of the rear under-floor beam are respectively fixed with a right rear under-floor beam extension plate and a left rear under-floor beam extension plate by welding. The invention reduces the risk of fuel tank damage and fuel leakage during rear collision, as well as potential safety hazards.

Description

A skeleton structure for improving rear collision safety performance

technical field

The invention relates to the technical field of automobile safety, in particular to a skeleton structure for improving rear collision safety performance.

Background technique

From the aspect of mandatory regulations, the safety of the fuel system in the rear collision is mandatory, and the fuel safety is directly related to the maximum equivalent plastic strain of the fuel tank during the rear collision of the vehicle body. The better the performance, the CAE simulation analysis shows that the maximum equivalent plastic strain value of the fuel tank in the rear collision of a certain model is 24.4%, and the risk of fuel leakage from damage to the fuel tank is extremely high during the rear collision. After use, it will cause loosening of screws, etc., which will lead to squeezing and pulling between various components, increasing the safety hazard.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a skeleton structure for improving the safety performance of rear collision. The rear section of the floor longitudinal beam is added under the beam frame assembly. The material of the rear section of the floor longitudinal beam is a steel plate with a yield strength of 1.5 mm and 130 MPa, and two groups When a collision occurs, after the floor itself absorbs energy and collapses, the rear section of the floor longitudinal beam continues to undergo secondary collapse and energy absorption, which increases the overall energy absorption of the beam frame assembly and can significantly improve the rear collision safety. The performance greatly reduces the risk of fuel tank damage and fuel leakage in the event of a rear collision, and changes the previous way of fixing and connecting parts by screws, and is connected and fixed by welding, which has better fixation and eliminates extrusion between parts and pulling, reducing the potential safety hazard, so as to solve the problems raised in the above-mentioned background art.

To achieve the above object, the present invention provides the following technical solutions:

A skeleton structure for improving rear collision safety performance includes a beam frame assembly on which an underfloor beam is fixed by welding, the left side of the underfloor beam is provided with a rear section of a right rear floor longitudinal beam, and The right side is provided with the rear section of the left rear floor longitudinal beam. The rear section of the right rear floor longitudinal beam and the rear section of the left rear floor longitudinal beam are respectively fixed on the beam frame assembly by welding. The rear section of the floor longitudinal beam, the other end of the rear section of the floor longitudinal beam is fixed to the bottom of the beam frame assembly by welding, the left side of the under-floor beam is fixed with the right under-floor beam extension plate by welding, and the right side is fixed by welding with a The left under-floor beam extension plate, the other end of the right under-floor beam extension plate is fixed on the rear section of the right rear floor longitudinal beam by welding, and the other end of the left under-floor beam extension plate is welded and fixed at the rear of the left rear floor longitudinal beam The top of the rear section of the right rear floor longitudinal beam is fixed to the right rear floor longitudinal beam by welding, the top of the rear section of the left rear floor longitudinal beam is fixed to the left rear floor longitudinal beam by welding, and the top of the beam frame assembly is fixed to the left rear floor longitudinal beam. A rear under-floor beam is provided, the left and right sides of the rear under-floor beam are respectively fixed with a right rear under-floor beam extension plate and a left rear under-floor beam extension plate, and the top of the right rear floor longitudinal beam is fixed on the right side by welding. The bottom of the extension plate of the rear under-floor cross member, the left rear floor longitudinal beam is fixed on the bottom of the extension plate of the left rear under-floor cross member by welding.

Preferably, a spare tire groove panel is provided on the beam frame assembly, and the spare tire groove panel is located on the rear side of the rear section of the floor longitudinal beam.

Preferably, the combination of the beam frame assembly and the rear underfloor beam is provided with a first sponge strip.

Preferably, a set of buffer pads are respectively provided on the left and right sides of the beam frame assembly.

Preferably, a second sponge strip is arranged at the joint of the underfloor beam and the beam frame assembly.

Preferably, two sets of mounting blocks are fixed at the bottom of the beam frame assembly by welding.

Compared with the prior art, the beneficial effects of the present invention are:

1. The rear section of the floor longitudinal beam is added under the beam frame assembly. The material of the rear section of the floor longitudinal beam is 1.5mm steel plate with a yield strength of 130 MPa, and two sets of collapse ribs are set. When a collision occurs, the floor itself will absorb energy and collapse After that, the rear section of the floor longitudinal beam continues to undergo secondary collapse energy absorption, which increases the overall energy absorption of the beam frame assembly, which can significantly improve the safety performance of rear collision, and greatly reduce the risk of fuel tank damage and fuel leakage during rear collision;

2. Changed the way of fixing and connecting the parts by screws in the past, and connected and fixed by welding, the fixation is better, the extrusion and pulling between the parts are eliminated, and the safety hazard is reduced.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the structural representation of the beam frame assembly of the present invention;

FIG. 3 is a schematic structural diagram of the cross beam under the bottom plate of the present invention.

In the picture: 1. Beam frame assembly; 2. Rear section of floor longitudinal beam; 3. Under-floor beam; 4. Extension plate of right under-floor beam; 5. Extension plate of left under-floor beam; Section; 7. Rear section of left rear floor longitudinal beam; 8. Right rear floor longitudinal beam; 9. Left rear floor longitudinal beam; 10. Rear under-floor beam; 11. Right rear under-floor beam extension plate; 12. Left rear floor Lower beam extension plate; 13. Spare tire groove panel; 14. The first sponge strip; 15. Mounting block; 16. Cushion pad; 17. The second sponge strip.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to Figures 1-3, the present invention provides a technical solution:

A skeleton structure for improving the safety performance of rear collision, comprising a beam frame assembly 1, on which an underfloor beam 3 is fixed by welding, and a right rear floor longitudinal beam rear section 6 is arranged on the left side of the underfloor beam 3, And the right side is provided with the left rear floor longitudinal beam rear section 7, the right rear floor longitudinal beam rear section 6 and the left rear floor longitudinal beam rear section 7 are respectively fixed on the beam frame assembly 1 by welding, and the lower floor cross beam 3 is welded on. The rear section 2 of the floor longitudinal beam is fixed, the other end of the rear section 2 of the floor longitudinal beam is fixed to the bottom of the beam frame assembly 1 by welding, and the left side of the under-floor beam 3 is fixed with a right under-floor beam extension plate 4 by welding, and the right side passes through The left under-floor cross-beam extension plate 5 is welded and fixed, the other end of the right under-floor cross-beam extension plate 4 is fixed on the rear section 6 of the right rear floor longitudinal beam by welding, and the other end of the left under-floor cross beam extension plate 5 is welded and fixed on the left rear floor On the rear section 7 of the longitudinal beam, the top of the rear section 6 of the right rear floor longitudinal beam is fixed with a right rear floor longitudinal beam 8 by welding, and the top of the rear section 7 of the left rear floor longitudinal beam is fixed with a left rear floor longitudinal beam 9 by welding. Two sets of mounting blocks 15 are fixed at the bottom of the unit 1 by welding, which are used for reinforcement between the beam frame assembly 1 and the vehicle body.

The top of the beam frame assembly 1 is provided with a rear under-floor beam 10, and the left and right sides of the rear under-floor beam 10 are respectively fixed with a right rear under-floor beam extension plate 11 and a left rear under-floor beam extension plate 12. The right rear floor longitudinal beam 8. The top is fixed to the bottom of the right rear underfloor beam extension plate 11 by welding, the left rear floor longitudinal beam 9 is fixed to the bottom of the left rear underfloor beam extension plate 12 by welding, and the beam frame assembly 1 is provided with a spare tire groove panel 13, The spare tire groove panel 13 is located on the rear side of the rear section 2 of the floor longitudinal beam, and is used to support the spare tire. The beam frame assembly 1 and the rear underfloor cross beam 10 are combined with a first sponge strip 14. When a collision occurs , which can reduce the collision force between the beam frame assembly 1 and the rear underfloor beam 10. A set of buffer pads 16 are respectively provided on the left and right sides of the beam frame assembly 1. When the vehicle passes through uneven terrain, the beam frame assembly can be There is a certain buffering force between the floor 1 and the ground to prevent the beam frame assembly 1 from directly contacting the ground, thereby causing damage to various components. A second sponge sliver 17 is provided at the junction of the under-floor beam 3 and the beam frame assembly 1 , a buffer force can be formed between the underfloor beam 3 and the beam frame assembly 1 .

working principle:

The connection between the components is formed by spot welding connection. Among them, the rear section 2 of the floor longitudinal beam is made of 1.5mm steel plate with a yield strength of 130MPa, and two sets of crush bars are installed; the underfloor beam 3 is made of a 1.2mm steel plate with a yield strength of 250MPa; The floor longitudinal beam 8 and the left rear floor longitudinal beam 9 are made of 1.5mm yield strength 340MPa steel plate, and three sets of crush bars are respectively set; 340MPa steel plate; during installation, weld the right rear floor longitudinal beam 8, the right rear floor longitudinal beam rear section 6, the right lower floor beam extension plate 4 and the right rear lower floor beam extension plate 11 to each other as a whole. Similarly, The four groups of components corresponding to the right side are also welded into a whole, the rear section 2 of the floor longitudinal beam and the underfloor beam 3 are welded into a whole, and then the above three wholes and the rear underfloor beam 10 are welded into an assembly. , so that the cross-sections of all beams and longitudinal beams form a closed-loop structure, which improves the structural strength and improves the safety performance of rear collision.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (6)

1. A skeleton structure for improving rear collision safety performance, comprising a beam frame assembly (1), characterized in that: an underfloor beam (3) is fixed on the beam frame assembly (1) by welding, and the floor The left side of the lower cross member (3) is provided with a right rear floor longitudinal beam rear section (6), and the right side is provided with a left rear floor longitudinal beam rear section (7), the right rear floor longitudinal beam rear section (6) and the left The rear sections (7) of the rear floor longitudinal beams are respectively fixed on the beam frame assembly (1) by welding, and the floor longitudinal beam rear sections (2) are fixed on the lower floor beams (3) by welding. The other end of the rear section (2) is fixed to the bottom of the beam frame assembly (1) by welding, the left side of the underfloor beam (3) is fixed with a right underfloor beam extension plate (4) by welding, and the right side is fixed by welding There is a left under-floor beam extension plate (5), the other end of the right under-floor beam extension plate (4) is fixed on the rear section (6) of the right rear floor longitudinal beam by welding, and the left under-floor beam extension plate (5) ) The other end is fixed to the rear left rear floor longitudinal beam (7) by welding, the top of the rear right rear floor longitudinal beam (6) is fixed to the right rear floor longitudinal beam (8) by welding, and the left rear floor The top of the rear section (7) of the longitudinal beam is fixed with a left rear floor longitudinal beam (9) by welding, and the top of the beam frame assembly (1) is provided with a rear under-floor beam (10), and the rear under-floor beam (10) The left and right sides are respectively fixed with a right rear underfloor beam extension plate (11) and a left rear underfloor beam extension plate (12), and the top of the right rear floor longitudinal beam (8) is fixed on the right rear underfloor beam by welding. The bottom of the extension plate (11), the left rear floor longitudinal beam (9) is fixed on the bottom of the left rear floor cross beam extension plate (12) by welding. 2. A skeleton structure for improving rear collision safety performance according to claim 1, wherein a spare tire groove panel (13) is provided on the beam frame assembly (1), and the spare tire groove panel is provided on the beam frame assembly (1). (13) is located on the rear side of the rear section (2) of the floor longitudinal beam. 3. A skeleton structure for improving rear collision safety performance according to claim 1, characterized in that: the combination of the beam frame assembly (1) and the rear underfloor beam (10) is provided with a first sponge Article (14). 4. A skeleton structure for improving rear collision safety performance according to claim 1, characterized in that: a set of buffer pads (16) are respectively provided on the left and right sides of the beam frame assembly (1). 5. A skeleton structure for improving rear collision safety performance according to claim 1, characterized in that: a second sponge sliver is provided at the junction of the underfloor beam (3) and the beam frame assembly (1). (17). 6 . The skeleton structure for improving rear collision safety performance according to claim 1 , wherein two sets of mounting blocks ( 15 ) are fixed at the bottom of the beam frame assembly ( 1 ) by welding. 7 .

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