Trunk Door Bead Configuration for V-Shape Deformation Control
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Solution Overview
Problem
The existing trunk door structures deform into a 'V' shape when closed due to urging forces and reaction forces from weatherstripping, leading to corner protrusion, which current measures like increased thickness or reinforcing members fail to adequately address without adding weight or complexity.
Innovation Solution
A trunk door structure featuring an outer and inner panel with a ring bead, longitudinal bead, and lateral bead configuration that suppresses stiffness at the ridgeline region, along with auxiliary beads connecting these elements, to prevent deformation without adding reinforcing members or increasing plate thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the plate thickness of the trunk door is increased or reinforcing members are added to suppress deformation, then the structural strength is improved, but the weight and complexity of the door structure increase
Solution Approach 1:
The patent applies local quality by forming beads (protrusions) at specific critical locations on the trunk door inner panel, particularly at the ridgeline region between the upper wall and rear wall portions. These localized structural modifications concentrate reinforcement where deformation occurs most, rather than uniformly increasing thickness or adding comprehensive reinforcing members throughout the entire door structure.
Solution Approach 2:
The patent segments the reinforcement function by dividing the trunk door into multiple panels (inner panel and outer panel) and applying targeted bead formations at specific regions. The bead structure is further segmented into different types (first bead, second bead, third bead) positioned at different locations, each serving specific structural purposes to collectively resist deformation without requiring a single heavy reinforcing component.
2Strength
If the plate thickness of the trunk door is increased or reinforcing members are added to suppress deformation, then the structural strength is improved, but the number of members and complexity increase
Solution Approach 1:
The patent merges the reinforcement function into the existing trunk door panel structure by forming beads directly on the inner panel surface. This integrates the strengthening function into the base structure rather than adding separate reinforcing members, thereby reducing the total number of components while maintaining structural integrity.
Solution Approach 2:
By applying localized bead formations only at critical stress regions (ridgeline, corner portions, and specific panel regions) rather than uniformly reinforcing the entire door, the patent achieves effective deformation suppression with minimal structural modifications, reducing overall complexity.
3Manufacturing precision
If beads are formed at the ridgeline region to suppress deformation, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The patent forms beads with specific geometric characteristics (protrusions with defined heights, widths, and positions) at precise locations on the inner panel. These controlled local features provide predictable deformation resistance while maintaining relatively simple manufacturing processes compared to complex reinforcing member assemblies.
Solution Approach 2:
The bead structure is segmented into multiple types (first bead along the ridgeline, second bead at corner portions, third bead at other regions) with different configurations optimized for their specific locations. This segmentation allows each bead type to address specific deformation modes while keeping individual bead structures simple and manufacturable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively suppresses deformation and twisting of the trunk door, maintaining structural integrity without weight or cost increments by optimizing the arrangement of beads within the door's panel structure.
Implementation Method 1
an urging member connected to both sides in the vehicle width direction of the vehicle forward side of the trunk door, the urging member urging the trunk door in an opening direction
Implementation Method 2
a reaction force acts on the trunk door from weatherstripping, which is a resilient body
Data Source
AI summary
Deformation of a trunk door is suppressed with a simple structure. A lateral bead is formed along a ridgeline region that is formed by an inner upper wall portion and an inner rear wall portion of an inner panel of the trunk door. The lateral bead is not connected to a ring bead formed at an outer periphery of the inner panel. Thus, stiffness of the ridgeline region may be suppressed compared with a case in which the lateral bead is connected to the ring bead. Thus, substantial V-form folding of an outer upper wall portion and an outer rear wall portion may be suppressed.