Front Side Frame Structure for Offset Crash Force Transmission
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Solution Overview
Problem
Conventional vehicle body front side member structures fail to effectively transmit crash forces during offset crashes, leading to increased cabin invasion and high material costs, as they lack a closed loop structure for force transmission, resulting in inadequate crashworthiness and bending deformation of the A-pillar.
Innovation Solution
A vehicle body front side member structure incorporating a front side member assembly, an upper side beam assembly, a front side member connection plate assembly, and a front anti-crash beam energy absorption box assembly, with a specialized design that includes a box body with a gradually decreasing cross-section and energy absorption components to optimize crash force transmission and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transmission route for crash force is used, then the structure is simple, but the crash force transmission effectiveness is insufficient leading to increased cabin invasion
Solution Approach 1:
The front side member structure is divided into multiple functional segments: the front side member assembly, upper side beam assembly, connection plate assembly, and energy absorption box assembly. Each segment has specific functions for force transmission, connection, and energy absorption, creating multiple force transmission routes while maintaining modular simplicity
Solution Approach 2:
The energy absorption box assembly is nested within the front side member structure, with the box body positioned inside the front side member assembly. This nested configuration allows the energy absorption component to be integrated into the overall structure, providing multiple force transmission paths without significantly increasing external complexity
2Strength
If reinforcing plates or increased plate thickness are added to increase rigidity and strength, then the structural strength is improved, but the welding difficulty increases and material cost rises
Solution Approach 1:
The structure combines different material forms and configurations: the front side member assembly uses high-strength steel plates, while the energy absorption box assembly uses a box-shaped structure with specific wall thicknesses. The connection plate assembly integrates multiple plates welded together to form a rigid connection structure, achieving high strength through material composition rather than simply increasing thickness throughout
Solution Approach 2:
Different parts of the structure have different thicknesses and material properties optimized for their specific functions. The front side member assembly has varying plate thicknesses at different locations, the connection plate assembly has localized reinforcing areas, and the energy absorption box has specific wall thicknesses. This local optimization achieves high strength where needed without uniformly increasing material usage and welding complexity
3Use of energy by moving object
If the box body has a cross section with area gradually decreased from front wall toward back wall, then the energy absorption capability is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The box body cross-sectional area changes gradually from front to back, with the area being largest at the front wall and progressively decreasing toward the back wall. This parameter change optimizes the energy absorption sequence during impact, allowing controlled deformation and energy dissipation while managing manufacturing precision through defined geometric progression
Data Source
AI summary
The present disclosure relates to a structure of a vehicle body front side member and relates to a technical field of automobile design and manufacture. A vehicle body front side member structure includes a front side member assembly, an upper side beam assembly, a front side member connection plate assembly, an upper side beam front assembly, a front anti-crash beam energy absorption box assembly, and a front anti-crash beam assembly. According to the front side member structure, it is possible to optimize the transmission route of the crash force and effectively improve the capability of the energy absorption of the front end of the vehicle body to reduce the load to the cabin stringer so as to reduce the invasion amount of the front cabin into the passenger cabin or avoid the front cabin from invading into the passenger cabin in order to improve the safety of the driver.