Vehicle Hood Structure with Holed Inner Panel for Collision Deformation
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Solution Overview
Problem
The formation of a longitudinally extending recessed portion in a vehicle hood's outer panel can make it harder to deform during collisions, thereby affecting collision performance.
Innovation Solution
A hood structure design where the outer panel has a recessed portion and the inner panel features holed portions that overlap the recessed portion, allowing for deformation during collisions by distributing load and promoting deformation zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a recessed portion is formed in the outer panel to improve aerodynamic performance or design, then the aesthetic appearance or airflow characteristics are improved, but the deformation capability during collision is reduced
Solution Approach 1:
The inner panel is segmented with multiple holed portions distributed across its surface, particularly in the recessed region. This segmentation creates multiple localized deformation zones that can independently deform during collision, allowing the recessed portion to maintain its aerodynamic shape while providing controlled deformation paths for collision energy absorption.
Solution Approach 2:
The inner panel exhibits non-uniform local quality through the strategic placement of holed portions. Regions with holed portions have reduced stiffness and enhanced deformation capability, while regions without holes maintain higher rigidity. This local variation in structural quality allows the recessed portion to deform effectively during collision while preserving overall structural integrity.
2Strength
If the outer panel is made more rigid to improve structural strength, then the overall strength is improved, but the deformation capability in specific regions is reduced
Solution Approach 1:
The inner panel is divided into multiple regions through the placement of holed portions, creating a segmented structure. This segmentation allows different regions to serve different functions: regions with holes provide deformation capability while regions without holes maintain structural strength, thus resolving the contradiction between overall strength and local deformation capability.
Solution Approach 2:
The inner panel employs local quality variation by concentrating holed portions in specific areas where deformation is needed. This creates zones of reduced stiffness for energy absorption while maintaining higher stiffness in other areas for structural support, allowing the panel to simultaneously achieve both strength and deformation capability.
Data Source
AI summary
A hood structure for a vehicle includes an outer panel on an upper side and an inner panel on a lower side. The outer panel and the inner panel are arranged to overlap each other in a plan view. The outer panel has a recessed portion extending substantially in a longitudinal direction and recessed downward, the inner panel has holed portions at least partially overlapping the recessed portion of the outer panel in the plan view, and at least two of the holed portions are arranged spaced from each other in the longitudinal direction.