CN-122009333-A - Flexible crashworthy vehicle body structure, auxiliary frame front end energy absorption assembly and vehicle configuration method

CN122009333ACN 122009333 ACN122009333 ACN 122009333ACN-122009333-A

Abstract

The invention discloses a flexible crashworthy vehicle body structure, an energy absorbing assembly at the front end of an auxiliary frame and a vehicle configuration method. The structure comprises a basic car body framework and a reinforcing component. The upper longitudinal beam connecting reinforcement adopts a four-plate splice welding structure, is arranged between the front section of the front longitudinal beam and the upper longitudinal beam of the front cabin, and is welded with the front longitudinal beam to form stable front vertical coupling, and the floor longitudinal beam reinforcement and the lower A column reinforcement are respectively positioned in the inner cavities of the floor longitudinal beam and the A column. For higher safety level, the front end energy absorbing component of the auxiliary frame is further arranged, and the position of the auxiliary anti-collision beam is not ahead of that of the main anti-collision beam. The invention realizes the flexible adjustment of the structure of the minimum part to meet different collision performance requirements.

Inventors

ZHANG XINGHONG
Sui Wenyi
ZHANG DAN
CHEN ZHENFEI

Assignees

东风汽车集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260130

Claims (11)

1. A flexible crashworthy car body structure, characterized by comprising the following steps: the basic car body framework comprises a front longitudinal beam, a front cabin upper longitudinal beam, an A column and a floor longitudinal beam, wherein the front longitudinal beam is arranged in a bilateral symmetry mode, the front cabin upper longitudinal beam is positioned above the front longitudinal beam, the A column is connected with the rear part of the front cabin upper longitudinal beam, the floor longitudinal beam is used for supporting the front longitudinal beam to extend backwards, and A selectively mountable reinforcement assembly configured to be assembled to a preset area of the basic body skeleton according to a preset collision safety level; The reinforcing component comprises at least: An upper side member connecting reinforcement provided between a front section of the front side member and a front section of the front cabin upper side member, one end of the upper side member connecting reinforcement being fixedly connected to the front cabin upper side member and the other end extending downward and being fixedly connected to the front side member, thereby constructing a vertical force transmission path connecting the upper and lower side members at a front portion of a vehicle body, and And the floor longitudinal beam reinforcing piece is arranged in the inner cavity of the floor longitudinal beam and extends along the length direction of the floor longitudinal beam, and is used for enhancing the deformation resistance of the bottom of the cab.
2. The flexible crashworthy body structure of claim 1 wherein the upper rail connection reinforcement is constructed as a semi-closed box structure comprising an upper connection plate, a lower connection plate, a front connection plate and a rear connection plate that are welded to each other; the upper connecting plate is connected to the tops of the front connecting plate and the rear connecting plate, and the lower connecting plate is welded to the bottoms of the front connecting plate and the rear connecting plate; The upper connecting plate is connected with the front cabin upper longitudinal beam, and the front connecting plate, the rear connecting plate and the lower connecting plate are connected with the front longitudinal beam.
3. The flexible crashworthy body structure of claim 1 wherein the front end of the floor rail reinforcement extends to the rear section area of the front rail and the rear end extends to the seat mounting cross member area on the floor rail, the outer contour of the floor rail reinforcement matching the cross-sectional shape of the interior cavity of the floor rail.
4. The flexible crashworthy body structure of claim 1 further comprising an a-pillar lower reinforcement disposed in an interior cavity at a lower end of the a-pillar; the lower reinforcing piece of the column A is of an L-shaped plate structure, the vertical part of the lower reinforcing piece is attached to the inner wall of the column A, and the horizontal part of the lower reinforcing piece extends backwards to the threshold beam.
5. The flexible crashworthy body structure of any one of claims 1 to 4, wherein the basic body framework further comprises a subframe, a front end of which is reserved with a mounting interface for mounting an auxiliary energy absorbing structure; When the first high-level collision safety level is met, the front end of the auxiliary frame is kept in an uninstalled state; and when the second high-level collision safety level higher than the first high-level collision safety level is met, the front end of the auxiliary frame is provided with an auxiliary frame front end energy absorption assembly.
6. A sub-frame front end energy absorbing assembly for a vehicle chassis adapted for use in a vehicle body structure as claimed in any one of claims 1 to 5, comprising: a pair of bracket extension beams arranged in bilateral symmetry, the rear ends of the bracket extension beams being configured to be fixedly connected to a front end interface of the subframe; A pair of auxiliary energy absorption boxes which are arranged in bilateral symmetry and are respectively connected with the front ends of the corresponding bracket extension beams, and The auxiliary anti-collision beam is transversely connected between the left auxiliary energy absorption box and the right auxiliary energy absorption box; the bracket extension beam, the auxiliary energy absorption box and the auxiliary anti-collision beam jointly form an auxiliary energy absorption and transmission path below the front longitudinal beam of the vehicle.
7. The subframe front end energy absorber assembly of claim 6, wherein the front end face of the secondary impact beam is located in the same vertical plane as the front end face of the primary impact beam of the vehicle or is located rearward of the front end face of the primary impact beam of the vehicle when the subframe front end energy absorber assembly is mounted to the vehicle to ensure that the primary impact beam contacts an obstacle prior to or concurrently with the secondary impact beam in the event of a collision.
8. The subframe front end energy absorber assembly of claim 6, further comprising a rail connecting beam having a lower end connected to the secondary impact beam and an upper end extending upwardly and configured to be connected to a front rail front section of a vehicle to form a vertical support between a subframe plane and a front rail plane.
9. A vehicle configuring method based on the vehicle body structure according to claim 1, characterized by comprising the steps of: s1, providing a basic vehicle body framework, wherein the basic vehicle body framework meets basic safety standards; s2, determining a preset collision safety level of the target vehicle; S3, if the preset collision safety level is a first high level, welding an upper longitudinal beam connecting reinforcement between a front longitudinal beam and an upper longitudinal beam of a front cabin in a welding process, and welding a floor longitudinal beam reinforcement in an inner cavity of the floor longitudinal beam; and S4, if the preset collision safety level is a second high level higher than the first high level, further assembling the auxiliary frame front end energy absorbing assembly according to any one of claims 5 to 8 to the auxiliary frame front end in a final assembly process on the basis of completing S3.
10. The method according to claim 9, wherein in step S3, the upper rail connecting reinforcement is formed by assembling and welding four independent connecting plates, and the A-pillar lower reinforcement is welded and fixed on the inner side surface of the A-pillar inner plate in advance before the A-pillar inner plate and the outer plate are buckled and welded.
11. The method of claim 9, wherein the first high level corresponds to CNCAP four-star standard and the second high level corresponds to CNCAP five-star standard, and wherein the subframe front end energy absorber assembly is bolted to the subframe as a pre-assembled modular assembly in step S4.

Description

Flexible crashworthy vehicle body structure, auxiliary frame front end energy absorption assembly and vehicle configuration method Technical Field The invention relates to the technical field of passive safety of automobiles, in particular to a flexible crashproof automobile body structure capable of being flexibly configured according to different crash safety performance requirements, an auxiliary frame front end energy absorption assembly and an automobile configuration method. Background In the development process of modern automobiles, automobile models under the same platform architecture often need to face different market segments, so that different collision safety performance requirements (such as national mandatory standards GB, CNCAP four stars, CNCAP five stars and the like) are faced. Existing body development models typically design quite different body structural solutions for different safety objectives. For example, in order to meet the five-star collision standard, it is generally necessary to fully reinforce a core skeleton such as a front side member, a Shotgun (front side member), a floor beam, or the like. The traditional mode of one-car design results in low general rate of car body parts, huge development cost, long design period and extremely high input cost of the die. In addition, if the vehicle body structure of the high-distribution vehicle type (five-star standard) is directly used on the low-distribution vehicle type (only meeting national standards), the safety performance is redundant, but unnecessary weight increase and material cost waste are caused, and the economical efficiency cannot be considered. In the prior art, the coupling effect between the upper longitudinal beam and the lower longitudinal beam at the front part is often ignored for strengthening the front cabin structure, so that the front longitudinal beam and the upper longitudinal beam are easy to be separated from each other in offset collision, and cannot form resultant force. Meanwhile, the conventional reinforcement manner is often realized by adding an external flitch, which may affect the matching of peripheral parts, resulting in complex design change. Therefore, there is a lack of a flexible vehicle body structure and a countermeasure that enables flexible switching of different crash performances based on the same platform through structural adjustment of a very small portion (particularly for front vertical connection and cavity interior enhancement). Disclosure of Invention Aiming at the problems that the development cost is high, the period is long and the economical efficiency cannot be considered when the existing platform vehicle model meets different collision requirements, the invention provides a flexible crashproof vehicle body structure, an auxiliary frame front end energy absorption assembly and a vehicle configuration method. The invention realizes the stepwise improvement of the performance of the vehicle body by constructing a vertical force transmission path at the front part, strengthening the inside of a cavity for implementing stealth on the floor and the A column and constructing an independent assembled auxiliary force transmission path on the chassis. To solve the above technical problem, in a first aspect, the present invention provides a flexible crashworthy vehicle body structure, including: the basic car body framework comprises a front longitudinal beam, a front cabin upper longitudinal beam, an A column and a floor longitudinal beam, wherein the front longitudinal beam is arranged in a bilateral symmetry mode, the front cabin upper longitudinal beam is positioned above the front longitudinal beam, the A column is connected with the rear part of the front cabin upper longitudinal beam, the floor longitudinal beam is used for supporting the front longitudinal beam to extend backwards, and A selectively mountable reinforcement assembly configured to be assembled to a preset area of the basic body skeleton according to a preset collision safety level; The reinforcing component comprises at least: An upper side member connecting reinforcement provided between a front section of the front side member and a front section of the front cabin upper side member, one end of the upper side member connecting reinforcement being fixedly connected to the front cabin upper side member and the other end extending downward and being fixedly connected to the front side member, thereby constructing a vertical force transmission path connecting the upper and lower side members at a front portion of a vehicle body, and And the floor longitudinal beam reinforcing piece is arranged in the inner cavity of the floor longitudinal beam and extends along the length direction of the floor longitudinal beam, and is used for enhancing the deformation resistance of the bottom of the cab. The upper longitudinal beam is connected with the reinforcing piece to bind the upper longitudinal beam and the lower