Angled Vehicle Structural Rail for Offset Collision Energy Absorption
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Solution Overview
Problem
Conventional vehicle structural rails are straight and do not engage in collisions with objects offset from the center of the front bumper, leading to inadequate energy absorption and distribution during vehicle impacts.
Innovation Solution
The design of angled rails with a main body and a front portion featuring bends and a crush can, which are angled outward to increase the cross-sectional area and provide energy absorption, allowing for better distribution of forces during collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If straight rails are used, then the structure is simple and easy to manufacture, but the rails do not engage in collisions with objects offset from the center of the front bumper, leading to inadequate energy absorption
Solution Approach 1:
The rail is designed with curved bends instead of straight geometry. The first bend angles the front portion outwardly relative to the main body, and the second bend further angles the crush can outwardly. This curvature enables the rail to engage with offset collision objects and redirect impact forces, thereby improving energy absorption while managing structural complexity through purposeful geometric design.
2Reliability
If the rail is angled outwardly with bends, then energy absorption and distribution is improved, but the manufacturing complexity increases
Solution Approach 1:
The rail is divided into distinct segments: a main body and a front portion (crush can) connected through defined bends. This segmentation allows each portion to be manufactured separately using standard fabrication processes, then assembled through welding or other connection methods. The modular approach enables complex angled geometry to be achieved while maintaining ease of manufacture through divided construction.
3Force
If the front portion is enlarged with outward bends, then the cross-sectional area is increased for better force distribution, but the material usage increases
Solution Approach 1:
The rail features localized enlargement at the front portion (crush can) with greater cross-sectional area compared to the main body. This local quality change concentrates material where collision forces are applied, optimizing force distribution and energy absorption. The tapered transition from the enlarged front portion to the narrower main body ensures material is strategically placed only where structurally necessary, avoiding excessive material usage throughout the entire rail.
Data Source
AI summary
In at least one implementation, a structural rail for a vehicle includes a main body and a front portion. The main body has an upper wall, a lower wall, an inner sidewall and an outer sidewall spaced from the inner sidewall. The front portion has a rear end adjacent to the second end of the main body and a front end spaced from the rear end. The main body has a first bend between the first end and second end so that a portion of the main body is angled outwardly and an included angle of less than 180 degrees is provided in the outer sidewall. The rail also includes a second bend between the first bend and the front end, and the second bend further angles at least part of the front portion outwardly relative to the outwardly angled portion of the main body.