CN111661154A - Cross structure of front bottom plate cross beam and bottom plate longitudinal beam of vehicle body and welding process - Google Patents

Abstract

The invention discloses a cross-shaped structure of a front floor beam and a floor longitudinal beam of a vehicle body, comprising a front floor beam, a front floor beam joint, a rear floor beam, a rear floor beam joint and a longitudinal beam, as well as a front floor beam connecting beam, a rear floor The outer joint of the beam, the sill beam and the sill pedal, the connecting beam of the front floor beam is arranged under the beam of the front floor. Welding, the front end of the sill beam is welded with the end of the connecting beam of the front floor beam, the rear end of the sill beam is welded with the outer joint of the rear floor beam, and the sill pedal is welded with the lower end of the longitudinal beam, the lower end of the connecting beam of the front floor beam, and the lower end of the sill beam respectively, and connected through the front floor beam The beam spans the longitudinal beam to form a stable and reliable cross-shaped structure, so that in the event of a frontal collision and a side collision, the collision force can be transmitted laterally and forwardly, solving the collision safety risk problem of the original single longitudinal beam structure.

Description

A cross-shaped structure and welding process of a front floor beam and a floor longitudinal beam of a vehicle body

technical field

The invention belongs to the technical field of automobile body structures, and in particular, the invention relates to a cross-shaped structure and a welding process of a front floor beam and a floor longitudinal beam of a body.

Background technique

In most of the existing car body substructure frame designs, the front longitudinal beam in the engine compartment extends rearward, fits the front baffle, and is connected to the longitudinal beam as a whole. At the same time, at the rear end of the front longitudinal beam, diagonal braced beam structures are added to the left and right, respectively, to realize the connection with the sill beam and the middle channel longitudinal beam, so as to realize the decomposition of the force transmission in front of the body into three paths, improve the force transmission performance of the front collision, and effectively increase the collision. Transmission effect. This body frame structure can effectively improve the front and side impact force transmission, and is widely used in the development of the existing body.

For the body structure with a large component system arranged in the middle of the engine or under the occupant, due to the design space, the front longitudinal beam in the engine compartment extends backward and is connected with the longitudinal beam to realize the penetration connection of the entire lower body longitudinal beam. Considering that non-body systems are arranged in the front floor area of the lower body, there is no room for body design. Only the front floor beams can be added in the lower body area in front of the driver's seat, which is connected with the longitudinal beams on both sides to form an "H"-shaped structure and improve the lower body frame. Stability, while the rear of the front floor beam is considered to arrange the power battery, there is no structural design space, and the design of the channel beam structure in the body cannot be carried out. At present, the lower part of the body can only achieve a single path of the longitudinal beam to extend backward, and the diagonal beam structure cannot be added. , that is, it is impossible to add multiple force transmission path structures. From the current structural point of view, the front floor beam is connected to the longitudinal beam, and the front floor beam is not laterally connected to the position of the sill beams on both sides of the body, but only through the sill pedal to connect the longitudinal beam and the sill. Beams, with a spacing of 250mm, are too large and lack a transverse force transmission path.

When a side collision occurs, the door sill pedal will be completely crushed as a thin-plate part, and the lateral space will be severely compressed, which will directly threaten the life safety of the driver and passenger, making the collision safety risk of this type of body structure vehicle high, which is not conducive to ensuring driving and riding. safe space for personnel.

SUMMARY OF THE INVENTION

The invention provides a cross-shaped structure and welding process of the front floor beam and the floor longitudinal beam of the vehicle body. Under the existing layout space, the design space of the body structure is fully considered, and the front floor beam connecting beam is added at the front of the vehicle body to connect to the longitudinal direction of the vehicle body. A stable and reliable cross-shaped structure is formed through the front floor beam joint and the longitudinal beam, so that the collision force can be transmitted laterally and forwardly in the event of a frontal collision and side collision, and the collision safety risk of the original single longitudinal beam structure can be solved. .

In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a cross-shaped structure of a front floor beam and a floor longitudinal beam of a vehicle body, comprising a front floor beam, a front floor beam joint, a rear floor beam, a rear floor beam joint and a longitudinal beam. The two ends of the front floor beam are welded to the longitudinal beam through the front floor beam joint, the two ends of the rear floor beam are welded to the longitudinal beam through the rear floor beam joint, and also include the front floor beam connecting beam, the rear floor beam outer joint, the threshold beam and the The door sill pedal, the front floor beam connecting beam is arranged below the front floor beam, and extends laterally outward, the front floor beam connecting beam is welded with the front floor beam, the front floor beam joint and the longitudinal beam respectively, and the rear floor beam is externally connected. It is located in the outward extension direction of the rear floor beam and is welded with the longitudinal beam. The lower end of the connecting beam of the front floor cross beam and the lower end of the sill beam are welded.

Preferably, a cross-shaped structure is formed at the welding place between the front floor cross beam connecting beam and the longitudinal beam.

Preferably, one end of the front floor cross-beam connecting beam is a wedge-shaped structure, and the other end is a square straight-face structure.

Preferably, the outer joint of the rear floor cross beam is an isosceles trapezoid structure.

Preferably, the outer joint of the rear floor cross beam is a right-angled trapezoid structure.

A welding process of a cross-shaped structure of a front bottom plate beam and a bottom plate longitudinal beam of a vehicle body specifically includes the following steps:

Step 1: Weld the two ends of the front bottom plate beam to the three sides of the front bottom plate beam joint respectively;

Step 2: Weld the front bottom plate beam joint and the longitudinal beam on three sides;

Step 3: Weld the two ends of the rear floor beam to the three sides of the rear floor beam joint respectively;

Step 4: Weld the cross beam joint of the rear bottom plate and the longitudinal beam on three sides;

Step 5: The connecting beam of the front floor beam is placed on the upper end of the front floor beam and extends laterally outwards;

Step 6: Weld the front floor beam connecting beams with the front floor beams, the front floor beam joints and the longitudinal beams respectively;

Step 7: The outer joint of the rear floor beam is placed on the outside of the longitudinal beam, and is located in the lateral and outward extension direction of the rear floor beam;

Step 8: Weld the outer joint of the rear floor beam to the longitudinal beam;

Step 9: Weld the front end of the door sill beam with the end of the connecting beam of the front floor beam, and the rear end of the door sill beam and the outer joint of the rear floor beam;

Step 10: Weld the sill pedal with the lower end of the longitudinal beam, the lower end of the connecting beam of the front floor cross beam, and the lower end of the sill beam respectively.

The beneficial effects of adopting the above technical solutions are:

1. The cross-shaped structure of the front floor beam and the floor longitudinal beam of the vehicle body also includes the front floor beam connecting beam, the rear floor beam outer joint, the sill beam and the sill pedal, and the front floor beam connecting beam is arranged above the front floor beam, and Extending laterally outward, the front floor cross beam connecting beam is welded with the front floor beam, the front floor beam joint and the longitudinal beam respectively, and the rear floor beam outer joint is located in the outward extension direction of the rear floor beam, and is welded with the longitudinal beam. The front end of the beam is welded with the end of the connecting beam of the front floor cross beam, and the rear end of the sill beam is welded with the outer joint of the rear floor beam. Through the welding of the front floor beam joint and the longitudinal beam, a "T" type joint beam structure is formed. On the basis of the original "T" type joint beam structure, the front floor beam connecting beam is added, which is located above the front floor beam, and the horizontal It extends outward and is welded to the front floor beam, the front floor beam joint and the longitudinal beam respectively. The front floor beam connecting beam runs through the entire longitudinal beam, from the front floor beam to the sill beam, through the front floor beam, the front floor beam joint and the longitudinal beam. It forms a stable and reliable cross-shaped structure, which greatly improves the performance of the beam joint structure at the intersection of the front floor beam and the longitudinal beam, and forms a cross-shaped structure with better performance than the original "T"-shaped joint beam, so as to realize the impact of frontal collision and When a side collision occurs, the collision force can be transmitted laterally and forwardly, solving the collision safety risk of the original single longitudinal beam structure.

One end of the front floor beam connecting beam is a wedge-shaped structure, and the other end is a square straight-face structure. The wedge-shaped structure facilitates welding with the front floor beam, and does not occupy too much space under the front floor beam. The square straight-face structure is convenient Welding with the sill beam; the outer joint of the rear floor beam is an isosceles trapezoid structure, which ensures the stability of the bearing structure when the outer joint of the rear floor beam is subjected to a side impact; the outer joint of the rear floor beam is a right-angled trapezoid structure, which not only ensures The load-bearing structure of the outer joint of the rear floor cross member is stable when it is subjected to a side impact, and the space occupied at the lower end of the vehicle body is reduced.

2. The cross-shaped structure is also conducive to the transmission of the front impact force along the longitudinal beam through the high-rigidity and high-strength cross-shaped structure, which is transmitted to both sides of the vehicle body through the front floor beam and the front floor beam connecting beam, and the force is transmitted through the entire lower body frame. Effectively improve front impact performance.

3. The transversely penetrating front floor beam connecting beam is welded with the front floor beam, the front floor beam joint and the longitudinal beam to form a cross-shaped structure with high rigidity and high strength. The side impact force hits the sill beam, is carried by the front floor beam joint, and passes The cross-shaped structure is transmitted to the front floor beam and the longitudinal beam, which increases the side impact force transmission path, which is conducive to the transmission and decomposition of the side impact force through the longitudinal beam front and rear, and avoids the door sill pedal being directly crushed as a thin plate part, avoiding lateral space compression. The problem of serious and direct threat to the life safety of drivers and passengers has improved the collision safety factor of this type of body structure model and greatly improved the side impact performance.

4. A welding process for the cross-shaped structure of the front floor beam and the floor longitudinal beam of the vehicle body. The above welding process does not greatly modify the welding process of the original "T"-shaped joint beam structure, nor does it design new front floor beams, front The structure of the bottom plate beam joint, the rear bottom plate beam, the rear bottom plate beam joint and the longitudinal beam does not need to re-open the stamping die, nor does it need to adjust the welding robot arm on the welding production line, only add a welding process of the front bottom plate beam connecting beam, While strengthening the rigidity and strength of the automobile body, it does not increase the excessive manufacturing cost.

Description of drawings

Fig. 1 is the cross-shaped structural axonometric view of the front floor beam and the floor longitudinal beam of the vehicle body;

Fig. 2 is the bottom view of the cross-shaped structure of the front floor beam and the floor longitudinal beam of the vehicle body;

Fig. 3 is A-A position sectional view in Fig. 2;

Fig. 4 is B-B position sectional view in Fig. 2;

Fig. 5 is C-C position sectional view in Fig. 2;

Fig. 6 is D-D position sectional view in Fig. 2;

Fig. 7 is a partial enlarged view of position E in Fig. 1;

in:

1. Front floor beam; 2. Front floor beam joint; 3. Rear floor beam; 4. Rear floor beam joint; 5. Longitudinal beam; 6. Front floor beam connecting beam; 7. Rear floor beam outer joint; 8. Threshold Beam; 9. Threshold pedal.

Detailed ways

Below with reference to the accompanying drawings, through the description of the embodiments, the specific embodiments of the present invention will be described in further detail, the purpose is to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solutions of the present invention, and contribute to its implementation.

As shown in Figures 1 to 7, the present invention is a cross-shaped structure and welding process of the front floor beam and the floor longitudinal beam of the body. Under the existing layout space, the body structure design space is fully considered, and a front floor is added at the front of the body. The beam connecting beam is connected to the longitudinal beam of the body, and forms a stable and reliable cross-shaped structure through the front floor beam joint and the longitudinal beam, so that the collision force can be transmitted laterally and forwardly in the event of a frontal collision and a side collision. The original single longitudinal beam structure collision safety risk problem.

Specifically, as shown in FIG. 1 to FIG. 7 , it includes a front floor beam 1, a front floor beam joint 2, a rear floor beam 3, a rear floor beam joint 4 and a longitudinal beam 5. Both ends of the front floor beam 1 pass through the front floor. The bottom plate beam joint 2 is welded with the longitudinal beam 5, and the two ends of the rear bottom plate beam 3 are welded with the longitudinal beam 5 through the rear bottom plate beam joint 4, and also include the front bottom plate beam connecting beam 6, the rear bottom plate beam outer joint 7, the rocker beam 8 and the The door sill pedal 9, the front floor beam connecting beam 6 is arranged below the front floor beam 1, and extends laterally outward, the front floor beam connecting beam 6 is welded with the front floor beam 1, the front floor beam joint 2 and the longitudinal beam 5 respectively, The outer joint 7 of the rear floor beam 3 is located in the outward extension direction of the rear floor beam 3, and is welded with the longitudinal beam 5, the front end of the rocker beam 8 is welded with the end of the connecting beam 6 of the front floor beam, and the rear end of the rocker beam 8 is welded with the rear floor. The outer joint 7 of the cross beam is welded, and the rocker pedal 9 is welded with the lower end of the longitudinal beam 5 , the lower end of the connecting beam 6 of the front floor cross beam, and the lower end of the rocker beam 8 respectively.

The cross-beam connecting beam 6 and the longitudinal beam 5 are welded to form a cross-shaped structure.

One end of the front floor cross beam connecting beam 6 is a wedge-shaped structure, and the other end is a square straight-face structure.

The outer joint 7 of the rear floor beam is an isosceles trapezoid structure.

The outer joint 7 of the rear floor cross beam is a right-angled trapezoid structure.

A welding process of a cross-shaped structure of a front bottom plate beam and a bottom plate longitudinal beam of a vehicle body specifically includes the following steps:

Step 1: Weld the two ends of the front floor beam 1 with the front floor beam joint 2 on three sides respectively;

Step 2: Weld the front bottom plate beam joint 2 and the longitudinal beam 5 on three sides;

Step 3: Weld the two ends of the rear floor beam 3 with the rear floor beam joint 4 on three sides respectively;

Step 4: Weld three sides of the rear bottom plate beam joint 4 and the longitudinal beam 5;

Step 5: The front floor cross beam connecting beam 6 is placed on the upper end of the front floor beam 1 and extends laterally outwards;

Step 6: The front floor beam connecting beam 6 is welded with the front floor beam 1, the front floor beam joint 2 and the longitudinal beam 5 respectively;

Step 7: The outer joint 7 of the rear floor beam is placed on the outside of the longitudinal beam 5, and is located in the laterally outward extending direction of the rear floor beam 3;

Step 8: Welding the outer joint 7 of the rear floor beam and the longitudinal beam 5;

Step 9: The front end of the rocker beam 8 is welded with the end of the connecting beam 6 of the front floor cross beam, and the rear end of the rocker beam 8 is welded with the outer joint 7 of the rear floor beam;

Step 10: The rocker pedal 9 is welded to the lower end of the longitudinal beam 5 , the lower end of the front floor cross beam connecting beam 6 and the lower end of the rocker beam 8 respectively.

The specific working mode is described below with specific embodiments:

Example 1:

The cross-shaped structure of the front floor beam and the floor longitudinal beam of the vehicle body also includes a front floor beam connecting beam 6, a rear floor beam outer joint 7, a rocker beam 8 and a rocker pedal 9. The front floor beam connecting beam 6 is arranged on the front floor beam. 1 below, and extends laterally outward, the front floor beam connecting beam 6 is welded with the front floor beam 1, the front floor beam joint 2 and the longitudinal beam 5 respectively, and the rear floor beam outer joint 7 is located in the outward extension direction of the rear floor beam 3. , and is welded with the longitudinal beam 5, the front end of the rocker beam 8 is welded with the end of the connecting beam 6 of the front floor cross beam, the rear end of the rocker beam 8 is welded with the outer joint 7 of the rear floor cross beam, and the rocker pedal 9 is respectively connected with the lower end of the longitudinal beam 5. , The lower end of the front floor beam connecting beam 6 and the lower end of the sill beam 8 are welded. Originally, both ends of the front floor beam 1 are welded with the longitudinal beam 5 through the front floor beam joint 2 to form a "T" type joint beam structure. In the original "T" shape On the basis of the joint beam structure, a front floor beam connecting beam 6 is added, which is arranged above the front floor beam 1 and extends laterally outward, and is welded with the front floor beam 1, the front floor beam joint 2 and the longitudinal beam 5 respectively. The floor cross beam connecting beam 6 runs through the entire longitudinal beam 5, and is connected from the front floor beam 1 to the sill beam 8. A stable and reliable cross-shaped structure is formed by the front floor beam 1, the front floor beam joint 2 and the longitudinal beam 5, which greatly improves the front floor beam. The structural performance of the beam joint at the intersection of 1 and the longitudinal beam 5 constitutes a cross-shaped structure with better performance than the original "T"-shaped joint beam, so that the collision force can be carried out laterally and positively in the event of a frontal collision and side collision. To transfer to solve the original single longitudinal beam structure collision safety risk problem.

One end of the front floor beam connecting beam 6 is a wedge-shaped structure, and the other end is a square straight-face structure. The structure facilitates the welding with the rocker beam 8; the outer joint 7 of the rear floor cross beam is an isosceles trapezoid structure, which ensures the stability of the bearing structure when the outer joint 7 of the rear floor beam is subjected to a side collision; the outer joint 7 of the rear floor beam is The right-angled trapezoid structure not only ensures the stability of the bearing structure when the outer joint 7 of the rear floor cross member is subjected to a side collision, but also reduces the space occupied at the lower end of the vehicle body.

Example 2:

In the process of force transmission in a frontal collision, the collision force is transmitted backwards along the front longitudinal beam and is transmitted to the cross-shaped structure. The collision force can be decomposed into three directions, and a part of the force is transmitted to the opposite side longitudinal beam 5 and The rocker beam 8, part of the force is transmitted to the side rocker beam 8 through the front floor cross beam connecting beam 6, and part of the force is transmitted backward along the longitudinal beam 5; when a front collision occurs, whether it is an offset collision or a frontal collision, it can be The entire lower body frame plays an integral bearing and force-bearing role, and the cross-shaped structure is also conducive to the transmission of the front impact force along the longitudinal beam 5 through the high-rigidity and high-strength cross-shaped structure through the front floor beam 1 and the front floor beam connecting beam 6. To both sides of the body, force is transmitted through the entire lower body frame, which effectively improves the front crash performance.

Example 3:

In the event of a side collision, since the front floor beam 1 and the left and right front floor beam connecting plates transversely penetrate the entire body, part of the lateral collision force can achieve good lateral bearing and force transmission, and part of the collision force is transmitted forward and backward through the longitudinal beam 5. Bearing and transmitting force to further improve the side impact effect, the transversely penetrating front floor beam connecting beam 6 is welded with the front floor beam 1, the front floor beam joint 2 and the longitudinal beam 5 to form a cross-shaped structure with high rigidity and high strength. The impact on the sill beam 8 is carried by the front floor beam joint 2, and is transmitted to the front floor beam 1 and the longitudinal beam 5 through the cross-shaped structure, which increases the side impact force transmission path, which is beneficial to the side impact force transmitted through the longitudinal beam 5. Decomposition, avoiding the direct crushing of the door sill pedal 9 as a thin plate part, avoiding the problem that the lateral space compression seriously and directly threatening the life safety of the driver and passengers, improving the collision safety factor of this type of vehicle body structure model, and greatly improving the side impact performance.

Example 4:

A welding process for the cross-shaped structure of the front floor beam and the floor longitudinal beam of the vehicle body. The above welding process does not greatly modify the welding process of the original "T"-shaped joint beam structure, nor does it design a new front floor beam 1. Front floor The structure of beam joint 2, rear floor beam 3, rear floor beam joint 4 and longitudinal beam 5 does not require a new punching die, nor does it need to adjust the welding robot arm on the welding production line, only one front floor beam connecting beam 6 is added The welding process, while strengthening the rigidity and strength of the automobile body, does not increase the excessive manufacturing cost.

The present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner, as long as various non-substantial improvements are made by adopting the method concept and technical solution of the present invention; or After improvement, it is within the protection scope of the present invention to directly apply the above-mentioned ideas and technical solutions of the present invention to other occasions.

Claims (6)

1. A cross-shaped structure of a front floor beam and a floor longitudinal beam of a vehicle body, comprising a front floor beam (1), a front floor beam joint (2), a rear floor beam (3), a rear floor beam joint (4) and a longitudinal beam ( 5), both ends of the front floor beam (1) are welded to the longitudinal beam (5) through the front floor beam joint (2), and both ends of the rear floor beam (3) are connected to the longitudinal beam through the rear floor beam joint (4) (5) Welding, which is characterized in that: it also includes a front floor beam connecting beam (6), a rear floor beam outer joint (7), a rocker beam (8) and a rocker pedal (9), the front floor beam connecting beam (6) ) is arranged below the front floor beam (1) and extends laterally outward, and the front floor beam connecting beam (6) is welded with the front floor beam (1), the front floor beam joint (2) and the longitudinal beam (5) respectively, so The outer joint (7) of the rear floor beam (7) is located in the outward extension direction of the rear floor beam (3), and is welded with the longitudinal beam (5), and the front end of the rocker beam (8) is welded with the end of the front floor beam connecting beam (6). , the rear end of the rocker beam (8) is welded with the outer joint (7) of the rear floor beam, and the rocker pedal (9) is respectively connected to the lower end of the longitudinal beam (5), the lower end of the front floor beam connecting beam (6), and the rocker beam (8) Bottom welding. 2 . The cross-shaped structure of the front floor beam and the floor longitudinal beam of the vehicle body according to claim 1 , wherein the welding place of the front floor beam connecting beam ( 6 ) and the longitudinal beam ( 5 ) forms a cross-shaped structure. 3 . 3. The cross-shaped structure of the front floor beam and the floor longitudinal beam of a vehicle body according to claim 1, wherein one end of the front floor beam connecting beam (6) is a wedge-shaped structure, and the other end is a square straight-face structure. 4. The cross-shaped structure and welding process of the front floor beam and the floor longitudinal beam of a vehicle body according to claim 1, wherein the outer joint (7) of the rear floor beam is an isosceles trapezoid structure. 5 . The cross-shaped structure of the front floor beam and the floor longitudinal beam of the vehicle body according to claim 1 , wherein the outer joint ( 7 ) of the rear floor beam is a right-angled trapezoid structure. 6 . 6. A welding process of a cross-shaped structure of a front bottom plate beam and a bottom plate longitudinal beam of a vehicle body, characterized in that: it specifically comprises the following steps: Step 1: Weld the two ends of the front floor beam (1) to the front floor beam joint (2) on three sides respectively; Step 2: Weld the front bottom plate beam joint (2) and the longitudinal beam (5) on three sides; Step 3: Weld the two ends of the rear floor beam (3) with the rear floor beam joint (4) on three sides respectively; Step 4: Weld three sides of the rear floor beam joint (4) and the longitudinal beam (5); Step 5: The front floor cross beam connecting beam (6) is placed on the upper end of the front floor cross beam (1), and extends laterally outwards; Step 6: welding the front floor cross beam connecting beam (6) with the front floor cross beam (1), the front floor cross beam joint (2) and the longitudinal beam (5) respectively; Step 7: The outer joint (7) of the rear floor beam is placed on the outside of the longitudinal beam (5), and is located in the laterally outward extension direction of the rear floor beam (3); Step 8: Welding the outer joint (7) of the rear floor beam and the longitudinal beam (5); Step 9: Weld the front end of the sill beam (8) with the end of the connecting beam (6) of the front floor beam, and the rear end of the sill beam (8) and the outer joint (7) of the rear floor beam; Step 10: The sill pedal (9) is respectively welded with the lower end of the longitudinal beam (5), the lower end of the front floor cross beam connecting beam (6), and the lower end of the sill beam (8).

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