Car variable-thickness front longitudinal beam inner plate structure meeting function customization requirement

Abstract

The invention discloses a car variable-thickness front longitudinal beam inner plate structure meeting a function customization requirement. The car variable-thickness front longitudinal beam inner plate structure meeting the function customization requirement comprises functional areas A, B, C and D. Each functional area corresponds to one equal-thickness area, and every two adjacent functional areas are connected in a continuous transition mode through a thickness transition area. The front longitudinal beam inner plate structure further comprises a front-end flange, an inducing groove, a lower-side flange, an upper-side flange and a rear-end flange. The functional area A is provided with the front-end flange and the inducing groove, the front-end flange is connected with an anti-collision beam through a spot welding process, and the inducing groove is distributed in the rear end of the functional area A. The functional area D is provided with the rear-end flange, and the rear-end flange is connected with a firewall through a spot welding process. The variable-thickness front longitudinal beam inner plate structure can play different functions according to the structure characteristics of all the functional areas, and absorbs collision energy to the maximum extent by making full use of the deformation space of a front longitudinal collision crushing area. The light weight andcollision resistance design of a front longitudinal beam is realized to the maximum extent.

Description

technical field [0001] The invention relates to the field of automobile passive safety structure design, in particular to an automobile variable-thickness front longitudinal beam inner panel structure meeting the requirements of function customization. Background technique [0002] The front longitudinal beam of the automobile is the most important energy-absorbing component and force-transmitting structure in the collision condition of the vehicle. The energy-absorbing capacity and deformation mode of the front longitudinal beam determine the quality of the acceleration response of the vehicle collision and the intrusion of the passenger compartment. Directly affect the driving safety of the occupant. Therefore, it has become a new important research topic to rationally design the structure of the front longitudinal beam of automobiles and improve its crashworthiness under the premise of satisfying the requirements of light weight. At present, the introduction of laser tai...

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Problems solved by technology

[0003] Chinese patent 200820238454.2 discloses a segmented laser tailor-welded automobile front longitudinal beam, including the front section of the longitudinal beam, the middle section of the longitudinal beam and the rear section of the longitudinal beam. Under the premise, the lightweight design is realized; however, due to the sudden change in the thickness of the welding seam of the tailor-welded blank, the stability of the collision deformation mode in the weld area of ​​the TWB structure will be poor, and it will also cause the backlash of the tailor-welded blank. Elasticity prediction, mold design and manufacturing difficulties

However, the front longitudinal beam structure is not divided into reasonable sections according to the general layout boundary conditions of the front cabin of the car, and the thickness of the front longitudinal beam structure tends to increase sequentially, resulting in the collision force transmitted to the passenger compartment under high-speed collision conditions. Problems such as too large, high peak acceleration, and excessive firewall intrusion are not conducive to occupant safety

[0005] Although the above-mentioned structure of the front longitudinal beam of the automobile has achieved a lightweight design to a certain extent and improved its energy-absorbing capacity, it still cannot make full use of the deformation space in the collision crush zone, and the front longitudinal beam cannot be reasonably designed from the perspective of occupant safety. Beam structure, so the force transmitted to the passenger compartment during the collision is too large, the acceleration peak value is high, etc., which is not conducive to the safety protection of the occupants

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