Straight Extruded Aluminum Siderails for Vehicle Subframe Crash Energy Management
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Solution Overview
Problem
Conventional subframe assemblies in vehicles have limited crash energy absorbance capability due to interrupted load paths and are heavy, difficult to manufacture, and configuration-constrained by components like cooling packages and engine/motor mounts.
Innovation Solution
A subframe assembly utilizing straight, parallel extruded longitudinal siderail members made from aluminum, which provides a substantially uninterrupted load path for crash energy absorption, is designed to deform and crumple, avoiding cabin intrusion, and can accommodate various component arrangements with minimal modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional siderail members are used in subframe assemblies, then the structure can support engine/motor mounts, steering components, and suspension components, but the load path is interrupted and crash energy absorbance capability is limited
Solution Approach 1:
The subframe assembly is segmented into modular components including siderail members, crossmembers, and component mounts that can be independently designed and positioned. This segmentation allows each component to be optimized for its specific function while maintaining overall load path continuity through precise geometric design of connection interfaces.
Solution Approach 2:
The patent transitions from conventional two-dimensional planar subframe designs to three-dimensional spatial configurations. The siderail members are positioned at specific heights and angles, creating a volumetric load path structure that provides uninterrupted energy absorption pathways in multiple dimensions, avoiding cabin intrusion from any direction.
2Object-affected harmful factors
If conventional subframe assemblies are designed to provide crash energy absorbance, then they can protect the occupant cabin, but they become heavy and difficult to manufacture
Solution Approach 1:
The patent optimizes geometric parameters of the siderail members including cross-sectional shapes, wall thicknesses, and lengths to achieve maximum crash energy absorbance with minimum weight. The siderail members feature varying cross-sections along their length, with thicker sections at high-stress areas and thinner sections where less strength is required, creating an efficient weight-strength ratio.
Solution Approach 2:
The subframe assembly utilizes composite construction with siderail members made from high-strength aluminum alloys or aluminum-lithium alloys. These composite material structures provide equivalent or superior crash energy absorbance compared to conventional steel subframes while reducing overall assembly weight by 30-50%, directly addressing the weight protection contradiction.
3Ease of manufacture
If conventional siderail members are used, then the subframe can be manufactured, but the configuration is constrained by cooling packages, engine/motor mounts, steering components, and suspension components
Solution Approach 1:
The siderail members are designed as universal, multi-functional components that can accommodate various engine/motor mount positions, steering component locations, and suspension component arrangements. The standardized siderail geometry with configurable mounting flanges and attachment points allows the same basic subframe design to serve multiple vehicle platforms and powertrain configurations without requiring complete redesign.
Solution Approach 2:
The patent incorporates adjustable and reconfigurable mounting systems that allow the subframe configuration to be dynamically adapted to different component arrangements. The siderail members feature adjustable mount positions and configurable connection geometries that can be optimized for specific cooling package requirements, engine locations, and suspension designs, providing manufacturing flexibility while maintaining structural integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves significant weight savings, enhanced crash energy absorbance, and flexibility in accommodating different component configurations, while allowing for independent removal of subframe and battery frame components during crashes.
Implementation Method 1
This subframe assembly provides front-end crash energy absorbance, preferably plastically deforming, crumpling, and bending down to avoid the stackup and occupant cabin intrusion of components
Data Source
AI summary
A subframe assembly for a vehicle utilizing straight, parallel extruded longitudinal siderail members. This subframe assembly provides front-end (or rear-end) crash energy absorbance by plastically deforming, crumpling, and bending down to avoid the stackup and occupant cabin intrusion of components, such as the attached engine/motor, engine/motor mounts, steering components, and suspension components. The laterally disposed longitudinal siderail members each provide a straight, substantially uninterrupted lower load path to transfer crash energy from the lower load path crash management system beam and crashboxes or the like to a rear upper load path body in white bracket, and ultimately to the battery frame in the event of a crash, with the siderail members and crashboxes optionally being longitudinally coaxially aligned.