CN112278087A

CN112278087A - Structure for improving compression resistance of top of passenger car

Info

Publication number: CN112278087A
Application number: CN202011303048.1A
Authority: CN
Inventors: 吴磊; 刘善英; 王洪广
Original assignee: Liuzhou Railway Vocational Technical College
Current assignee: Liuzhou Railway Vocational Technical College
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2021-01-29

Abstract

The invention relates to a structure for improving the top compression resistance of a passenger vehicle, which comprises a B column of the passenger vehicle, wherein the B column comprises a B column inner plate and a B column outer plate, the B column outer plate and the B column inner plate are welded into a cavity structure through welding edges, a reversed V-shaped reinforcing plate is designed in a cavity formed by the B column inner plate and the B column outer plate, the reinforcing plate is of a structure with a convex middle part, the reinforcing plate is welded with the B column inner plate through the welding edges at the two sides of the reinforcing plate, and a gap of 5mm is reserved between the convex surface in the middle of the reinforcing plate and the B column outer. When the top bears a large load to bend and deform the B-column inner plate to a certain extent, the reinforcing plate and the B-column outer plate are in contact force transmission, so that the load can be effectively diffused to the B-column outer plate with a stronger structure from the B-column inner plate with a relatively weak structure; avoid leading to this region to appear serious bending deformation because B post inner panel intensity is not enough.

Description

Structure for improving compression resistance of top of passenger car

Technical Field

The invention relates to a structural design for improving the top compression resistance of a passenger car.

Background

In order to reduce the injury of the traffic accident to people and finally achieve the ultimate goal of zero casualty, related national departments and organizations have long been dedicated to guiding various automobile manufacturing enterprises to improve the safety of automobiles through corresponding regulation and regulation specifications, wherein GB 26134-2010 passenger car top compressive strength is a national mandatory regulation established for preventing a cab from collapsing and invading into a passenger living space to cause injury to passengers when the automobiles have a rolling traffic accident. At present, the current national regulations require: the top pressure resistance is 1.5 times of the whole vehicle preparation quality, but not more than 22240N; the top compression resistance of the regulations of developed countries such as the United states is improved to 3 times of the mass of the whole vehicle, in addition, the roof strength is evaluated in a grading manner in the domestic C-IASI, the top compression resistance is less than 2.5 times of the mass of the whole vehicle, the evaluation is poor, the top compression resistance can be obtained only by 4 times, and the regulations of forcing in China are used for improving the top compression resistance to 3 times of the mass of the whole vehicle. Therefore, the existing developed vehicle type starts from the long-term market, and the design and development are carried out according to the requirement that the top pressure resistance reaches 3 times of the mass of the whole vehicle.

According to the structural characteristics of a vehicle body of a passenger vehicle, a B column is used as a most main bearing structure for top compression resistance and bears most of load in a top compression resistance test, however, due to the limitation of arrangement and modeling, the B column of the passenger vehicle is often in an arched state with a large upper part and a large lower part; when the structure is pressed and loaded by the top, the upper part of the B column is easy to bend, so that the pressure resistance of the top of the vehicle body is reduced. At present, the research on improving the top pressure resistance is small in China, and particularly under the large background of pursuing light automobile bodies, the pressure resistance of the top of the automobile body is effectively improved on the premise of not remarkably increasing the weight of the automobile body, and meanwhile, a plurality of automobile design engineers are troubled by meeting process requirements.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: provides a structure for improving the top compression resistance of a passenger car.

The technical scheme for solving the technical problems is as follows: the utility model provides a promote passenger car top compressive property structure, includes the B post of passenger car, and the B post includes B post inner panel and B post planking, and B post planking welds into the cavity structures through the welding limit with B post inner panel, and in the B post, the design has one "nearly" font reinforcing plate in the cavity that the planking formed, and the reinforcing plate is middle bellied structure, welds with B post inner panel through the welding limit of its both sides, reserves 5 mm's clearance between convex surface in the middle of the reinforcing plate and the B post planking. In the process of the compression deformation of the B column, the convex part of the structure shaped like a Chinese character 'ji' is in contact with the outer plate of the B column to transmit force, so that the bending rigidity of the B column is improved.

The further technical scheme of the invention is as follows: a gap of 5mm is reserved between the back surface of the inverted V-shaped reinforcing plate and the B column outer plate. A gap of 5mm is reserved between the reinforcing plate and the outer plate of the B column, so that abnormal sound caused by collision of structural members in the running process of a vehicle is effectively avoided on the premise of ensuring the bending resistance of the B column, and the leakage requirement of the electrophoresis process is met.

The weight of the reinforcing plate was 0.22 kg. The structure is light and efficient, and the bearing capacity of the top of the vehicle body is improved by 3.8kN under the condition that the weight is increased by only 0.22 kg.

Due to the adoption of the technical scheme, the structure for improving the compression resistance of the top of the passenger car has the following beneficial effects:

a cavity formed by an inner plate and an outer plate of a B column is internally provided with a reversed V-shaped reinforcing plate, and a gap of 5mm is reserved between the convex surface of the reversed V-shaped reinforcing plate and the outer plate of the B column; when the top bears a large load to bend and deform the B-column inner plate to a certain degree, the reinforcing plate and the B-column outer plate are in contact force transmission, so that the load can be effectively diffused from the B-column inner plate with a relatively weak structure to the B-column outer plate with a stronger structure; further bending deformation in the area caused by insufficient strength of the B-pillar inner plate is avoided. The technology has better effect on optimizing the welding process of the plate, improving the local plastic deformation of the stamping sheet metal structure and improving the bending resistance of the structure, and can be used for reference in mechanical design.

The technical features of a structure for improving the top compression resistance of a passenger car according to the present invention will be further described with reference to the drawings and the specific embodiments.

Drawings

FIG. 1: the reinforcing plate is arranged on the inner plate of the B column.

FIG. 2: fig. 1 is an enlarged view of the reinforcing plate.

FIG. 3: the cross-sectional view A-A in FIG. 2.

FIG. 4: the cross-sectional view B-B in FIG. 2.

FIG. 5: weld point location schematic diagram of reinforcing plate

FIG. 6: the position of the B-pillar inner plate and the reinforcing plate is schematically shown.

FIG. 7: schematic structure of a reinforcing plate shaped like a Chinese character 'ji'.

FIG. 8: a simulated calculated displacement-load curve.

In the above drawings, the respective reference numerals are explained as follows:

1-B column inner plate, 2-inverted V-shaped reinforcing plate, 3-B column outer plate, 4-welding point of reinforcing plate, 5-displacement-load curve of optimized state (after reinforcing plate is added), 6-displacement-load curve of basic state.

Detailed Description

The utility model provides a promote passenger car top compressive property structure, includes the B post of passenger car, the B post includes B post inner panel and B post planking, and B post planking welds into the cavity structures through the welding limit with B post inner panel, and in the B post, the design has the reinforcing plate of one "nearly" font in the cavity that the planking formed, and the reinforcing plate is middle bellied structure, welds limit and B post inner panel through the welding of its both sides, and the clearance of 5mm is reserved with the B post planking to the convex surface of "nearly" font reinforcing plate. The weight of the reinforcing plate was 0.22 kg.

The specific embodiment is as follows: the reinforcing plate with the inverted V-shaped structure is designed from the structural force transmission angle by comprehensively considering the structural characteristics, the installation arrangement, the process requirements, the weight and other factors of the B column; the reinforcing plate of the inverted V-shaped structure is welded along with the inner plate of the B column, and in order to ensure effective liquid leakage in the electrophoresis process and simultaneously ensure that abnormal sound is not generated due to collision among parts in daily use, a gap of 5mm is reserved between the convex surface of the inverted V-shaped reinforcing plate and the outer plate of the B column; when the top bears a large load to bend and deform the B-column inner plate to a certain degree, the inverted V-shaped reinforcing plate and the B-column outer plate are in contact force transmission, so that the load can be effectively diffused to the B-column outer plate with a stronger structure from the B-column inner plate with a relatively weak structure; the severe bending deformation of the area caused by insufficient strength of the B-column inner plate is avoided, so that the inverted V-shaped reinforcing plate is designed between the B-column inner plate and the B-column outer plate, and the weight of the scheme is increased by 0.22 kg. "nearly" font reinforcing plate is the sheet metal structure, the contact power transmission characteristics of panel beating after the deformation has been utilized, the 5mm clearance of reserving between "nearly" font reinforcing plate and B post planking makes it satisfy welding assembly and electrophoresis in-process weeping requirement promptly under the normal condition, can effectively avoid the collision production abnormal sound between the vehicle operation in-process structure again, when automobile body top pressurized leads to bending of B post inner panel to warp to the certain degree, "nearly" font reinforcing plate and B post planking contact, thereby with the load diffusion of B post inner panel to B post planking, the further bending of B post inner panel has been avoided, the bending rigidity of B post has been improved.

The application of the technology can obviously improve the top compression resistance of the passenger vehicle, and by taking a certain vehicle as an example, the compression resistance comparison of the top of the vehicle body before and after the application of the technology is obtained through finite element simulation analysis, as shown in fig. 8, the transverse coordinate is loading displacement (mm), the longitudinal coordinate is load (kN), the curve 5 is simulation calculation data of the embodiment, namely the curve 5 is a simulation calculation result with a reinforcing plate installed, and the curve 6 is simulation calculation data without the embodiment, namely the curve 6 is a simulation calculation result without a reinforcing plate installed. Through comparison of simulation results, after the technology is adopted, the compression resistance of the vehicle body is improved from 43.3kN to 47.1kN, the top bearing capacity is improved by 3.8kN, and the ratio of the maximum load to the whole vehicle mass is calculated to be 3.02 according to the whole vehicle mass of 1592kg, so that the requirement of being more than 3 times is met.

Claims

1. The utility model provides a promote passenger car top compressive property structure, includes the B post of passenger car, and the B post includes B post inner panel and B post planking, and B post planking welds into cavity structures, its characterized in that through welding limit with B post inner panel: a reinforcing plate shaped like a Chinese character 'ji' is designed in a cavity formed by the inner plate and the outer plate of the B column, the reinforcing plate is of a structure with a middle bulge, the reinforcing plate is welded with the inner plate of the B column through welding edges on two sides of the reinforcing plate, and a gap of 5mm is reserved between the middle convex surface of the reinforcing plate and the outer plate of the B column.

2. The structure for improving the top compression resistance of the passenger car as claimed in claim 1, wherein: a gap of 5mm is reserved between the back surface of the inverted V-shaped reinforcing plate and the B column outer plate.

3. The structure for improving the top compression resistance of the passenger car as claimed in claim 1, wherein: the weight of the reinforcing plate was 0.22 kg.