Vehicle Door Outer Panel Reinforcement Without Surface Unevenness
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Solution Overview
Problem
Existing exterior panel structures for vehicles face issues with uneven outer surfaces when reinforcing members are joined to the interior, leading to degradation in external appearance quality and increased susceptibility to dents during washing or waxing.
Innovation Solution
An exterior panel structure featuring a reinforcing member with separate joint sections and a coupling section that only abuts the interior surface under significant pressure, utilizing a joint intermediate section with higher rigidity than the reinforcing surface to maintain support while preventing distortion and dents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing members are joined to the inner surface of the exterior panel material, then support rigidity is improved and dents are reduced, but the outer surface becomes uneven and external appearance quality degrades
Solution Approach 1:
The reinforcing member is divided into multiple discrete reinforcing sections distributed across the inner surface, rather than using a continuous structure. This segmentation allows localized reinforcement without creating overall surface distortion, as each section independently supports the panel without pulling it inward uniformly
Solution Approach 2:
The reinforcing member is nested within the interior space of the exterior panel, positioned along the inner surface without protruding outward. This nesting arrangement allows the reinforcing structure to be hidden inside the panel cavity, providing support rigidity while keeping the outer surface smooth and aesthetically pleasing
2Weight of moving object
If the exterior panel material is thinned to reduce vehicle weight, then weight reduction is achieved, but the panel becomes more susceptible to dents during washing and waxing
Solution Approach 1:
The solution combines the thin exterior panel material with an internal reinforcing member to create a composite structure. The thin panel maintains weight reduction benefits while the internal reinforcing member provides dent resistance, achieving both goals through material composition rather than increasing panel thickness
Data Source
AI summary
An exterior panel structure for a vehicle prevents unevenness of an outer surface of an exterior panel material caused by joining of a reinforcing member to the exterior panel. The reinforcing member is joined to the exterior panel material such that rigidity is maintained, thereby keeping dents in the exterior panel material small even when a user presses on the exterior panel material during waxing of the vehicle, or the like. The exterior panel structure includes a door outer panel, a reinforcing member, and a bracket. In the bracket, a joint surface which follows an inner surface of the door outer panel is joined to an outer peripheral edge of the door panel which is separated from the inner surface of the door outer panel in a thickness direction of the door outer panel, and another joint surface is joined to a reinforcing outer peripheral edge of the reinforcing member.