Vehicle Bonnet Inner Panel Arch Framework
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Solution Overview
Problem
Existing vehicle bonnet designs face challenges in achieving optimal mechanical properties such as rigidity, dent resistance, and torsional rigidity while maintaining a low weight, and ensuring protection for vulnerable road users without increasing the vehicle's overall weight, which affects fuel consumption.
Innovation Solution
An inner bonnet panel with a reinforcing framework featuring an arch-shaped member that spans a significant portion of the panel, providing peripheral stability and attaching points for hinges and latches, combined with a secondary framework for enhanced structural integrity and reduced weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bonnet uses a solid panel structure to improve mechanical properties and rigidity, then the strength and torsional rigidity are improved, but the weight increases
Solution Approach 1:
The inner panel is segmented into a peripheral portion and a central portion with a framework structure. The framework includes arch-shaped members and longitudinal members that divide the panel into multiple cells, providing structural strength while reducing material usage compared to a solid panel.
Solution Approach 2:
The framework incorporates arch-shaped members with curved geometry. The arch shape naturally distributes loads and provides high structural efficiency, achieving high rigidity and strength-to-weight ratio without requiring a solid panel construction.
2Stability of the object's composition
If the bonnet uses a solid panel structure to improve torsional rigidity, then the torsional rigidity is improved, but the weight increases
Solution Approach 1:
The panel is divided into a framework structure with multiple cells formed by arch-shaped members and longitudinal members. This segmentation creates a rigid framework that resists torsional forces while using less material than a solid panel, thereby reducing weight.
Solution Approach 2:
The framework extends in multiple dimensions with arch-shaped members spanning across the panel and longitudinal members providing additional structural support. This multi-dimensional framework configuration enhances torsional rigidity without requiring increased material thickness or density.
3Weight of moving object
If the bonnet uses a framework structure with arch-shaped members to reduce weight, then the weight is reduced, but the manufacturing complexity increases
Solution Approach 1:
The framework is segmented into standardized components including arch-shaped members and longitudinal members that can be manufactured separately and then assembled. This modular segmentation allows for specialized manufacturing processes for each component type while simplifying the overall assembly process.
Solution Approach 2:
The arch-shaped members serve multiple functions: they provide structural rigidity, reduce weight, and act as attachment points for the outer panel. This multi-functionality reduces the need for additional components and simplifies the overall manufacturing process despite the complex geometry.
Data Source
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AI summary
The present disclosure relates to an inner panel (2, 2') for a vehicle bonnet (58). The inner panel (2, 2') comprises a peripheral portion (4), extending along at least a portion of a periphery of the inner panel, and a central portion (6), located within the peripheral portion (4). The central portion has a longitudinal extension (a) and a transverse extension (b). The central portion comprises a reinforcing framework (16, 16'), whereof a portion forms an arch-shaped member (18). A longitudinal extension (c) of the arch-shaped member is equal to or greater than 30% of the longitudinal extension (e) of the inner panel (2, 2'). A transverse extension (d) of the arch-shaped member is equal to or greater than 40% of the transverse extension (f) of the inner panel (2, 2'). The disclosure further relates to a bonnet (58) comprising such an inner panel (2, 2') and an outer panel (56).