Automobile rear longitudinal girder having gradually changing cross section

Abstract

The invention relates to an automobile rear side member with a gradually varied section. The section of the rear side member is C type and the rear side member shows a variable section structure from front to back, a region A corresponding to an oil box and installation positions of the back row of chairs has the largest section area, and a region C corresponding to a luggage compartment has the least section area, and a transition region B with the gradually decreased section area is arranged between the region A and the region B. The invention is designed into different sections for meeting different strength requirements of different parts of the rear side member, according to the requirements for protecting passengers and the oil box safety, the structure meets the requirements that the front part is hard and the rear part is softer, a gradually varied continuous structure is adopted to manufacture the rear side member through controlling different sections of the three regions to vary the section area from large to small along the section area from front to back and according to the structure function needs to meet the rule requirements on rear-end collision.

Description

technical field [0001] The invention relates to an automobile rear longitudinal beam structure. Background technique [0002] Since the load of the whole vehicle must be borne by the body, and the underbody structure is the carrier for installing the components of the chassis, the force is transmitted to the bottom structural members through the support and fixing points of each component, which requires that the underbody structure should be a relatively A complete carrier with high strength and rigidity. In order to ensure that the fuel tank is not squeezed to threaten the occupants when a rear collision occurs, and to minimize the impact energy during the rear collision on the rear occupants. Through the design of hard front and soft rear, the rear part collapses first, digests part of the energy and then continues to buffer, reducing the energy transmitted to the body. Usually, the main hope is to realize this function by the side members of the rear floor. The traditi...

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Problems solved by technology

Usually, the main hope is to realize this function by the side members of the rear floor. The traditional way is to arrange reinforcement plates of different thicknesses in the side members of the same cross-section as a whole to meet this load-bearing characteristic. Although the design of hard front and soft rear has been inherited However, often due to analysis deviations, sudden changes in force are caused, that is, the strength of a certain part changes from hard to soft and jumps, resulting in direct collapse during collisions, and it is too late to disperse the energy and directly act on the body, causing damage to the body. To a large extent, it poses a threat to the safety of members

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