C-Bracket Stiffening Assembly for Vehicle Cowl Panel Vibration Control
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Solution Overview
Problem
The vehicle instrument panel attached to a cowl panel experiences significant vibration and translation due to engine- and road-induced vibrations, leading to a lowered noise, vibration, and harshness (NVH) characteristic, which affects passenger comfort and safety.
Innovation Solution
A stiffening assembly comprising a pair of cooperating C-shaped brackets with parallel arms and flanges, which are adjustable and attachable to both the vehicle-rearward and vehicle-forward cowl panel walls, reducing the panel's tendency to translate and deflect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the instrument panel is attached to the cowl panel at high attachment points, then the instrument panel can be securely mounted, but vibration and translation occur due to engine- and road-induced vibrations, lowering NVH characteristics
Solution Approach 1:
The patent introduces a third dimension by adding vertical support between the instrument panel and cowl panel. Instead of only horizontal attachment at high points, the support extends vertically downward to engage the lower cowl panel, creating a three-dimensional support structure that reduces vibration and translation while maintaining secure mounting.
Solution Approach 2:
The patent introduces an intermediary component (the support structure with lower engagement) between the instrument panel and cowl panel. This intermediary element absorbs and dampens vibrations, preventing direct transmission of engine- and road-induced vibrations to the instrument panel, thereby improving NVH characteristics while maintaining secure attachment.
2Object-affected harmful factors
If the cowl panel is made stiffer to reduce vibration, then NVH characteristics improve, but the complexity and weight of the vehicle increase
Solution Approach 1:
The patent segments the support function into two parts: the existing high attachment points and the new lower support structure. This segmentation allows the cowl panel itself to remain relatively simple and lightweight, while the added support structure specifically addresses vibration issues without requiring the entire cowl panel to be made stiffer or more complex.
Solution Approach 2:
The patent applies local quality by adding stiffness and support only where needed - at the lower portion of the cowl panel where vibration transmission occurs. This localized reinforcement through the support structure improves NVH characteristics without requiring the entire cowl panel to be made stiffer, thereby avoiding increased overall complexity and weight.
3Ease of manufacture
If traditional attachment methods are used, then the instrument panel can be mounted, but significant vibration and translation occur during vehicle operation
Solution Approach 1:
The patent incorporates preliminary action by pre-forming the support structure with engagement features that align with predetermined locations on the cowl panel. The support structure is designed with built-in alignment and engagement capabilities that facilitate straightforward assembly, maintaining ease of manufacture while effectively reducing instrument panel movement through the added vertical support.
Data Source
AI summary
A stiffening assembly for a vehicle cowl panel includes a pair of cooperating C-shaped brackets. Each of the pair of cooperating C-shaped brackets comprises cooperating bracket arms adapted for holding opposed ends of the pair of cooperating C-shaped brackets at varying distances from one another. Each of the pair of cooperating C-shaped brackets comprises a pair of parallel bracket arms which align with one another when the stiffening assembly is attached to the cowl panel. Cowl panel and instrument panel assemblies incorporating one or more stiffening assemblies and vehicles incorporating the cowl panel and instrument panel assemblies are provided.