Two-Piece Bumper Trim Assembly for Concealed Gap Alignment
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Solution Overview
Problem
Conventional bumper skins for motor vehicles face challenges in managing the dimensional dispersions due to manufacturing tolerances, which affects the optimal fit and aesthetics of decorative hubcaps at the lateral ends, leading to a compromised aesthetic rendering and perceived quality.
Innovation Solution
The solution involves an enhancer for the bumper skin consisting of two elongated plastic parts with U-section internal side portions, allowing for adjustable spacing and a tenon mechanism to hide lateral gaps, ensuring optimal alignment and aesthetic concealment of the hubcaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-piece trim is used to extend transversely along the bumper skin, then the manufacturing process is simpler and the structure is more compact, but dimensional variations due to manufacturing tolerances prevent optimal management of gaps at the external lateral ends, deteriorating aesthetic appearance
Solution Approach 1:
The trim is divided into two separate longitudinal portions that can be manufactured independently with controlled dimensions. Each portion fits into a corresponding groove on the bumper skin, allowing the gap management function to be decoupled from the overall trim manufacturing. This segmentation enables precise control of the spacing between inner edges while maintaining manufacturing feasibility.
2Ease of manufacture
If the trim pieces are made with fixed dimensions, then manufacturing is more straightforward, but the spacing between inner edges of longitudinal portions cannot be optimized, leading to visible gaps that compromise aesthetics
Solution Approach 1:
The design incorporates a tenon on one trim portion that protrudes toward the center of the bumper skin, and a corresponding recess on the other portion that receives this tenon. This preliminary geometric configuration ensures that when the two portions are assembled, the spacing between their inner edges is pre-determined and optimized for aesthetic appearance, while each portion can still be manufactured with standard tolerances.
3Device complexity
If the trim is designed as one continuous piece, then the structure is simpler and fewer components are needed, but the lateral play between the trim and bumper skin is visible, reducing perceived quality
Solution Approach 1:
The tenon of one trim portion is designed to fit into the recess of the other portion, creating a nested configuration. This nesting arrangement allows the two separate components to be assembled with precise relative positioning, concealing the lateral play between the trim and bumper skin. The nested structure effectively hides the joints and gaps that would otherwise be visible, maintaining perceived quality despite the use of multiple components.
Data Source
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AI summary
[The invention relates to a trim piece (1) for a motor vehicle bumper skin intended to rest fixedly against the outer face of said skin, said trim piece being made of two transversely elongated plastic pieces (100, 200) intended to be fixedly attached end to end one after the other against the outer face of said skin, each said piece having an inner lateral portion comprising a front face (141, 241), one (100) of said pieces further comprising a tenon (150) extending in the inner continuation of its inner lateral portion (140), set back inwards relative to the inner edge of the latter, and on which the inner lateral end of the inner lateral portion (240) of the other (200) of said pieces is provided to fit together with an overlap, so that the inner edges of the inner lateral portions of these two pieces are located opposite each other from each other.