Vehicle Back Door Reinforcement Around Hinge and Glass Edge
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Solution Overview
Problem
Existing vehicle back doors face challenges in maintaining rigidity, especially at the corners and upper edges of the back window glass, which can lead to bending deformation and increased aerodynamic resistance.
Innovation Solution
The implementation of a back door structure that includes a first reinforcing member extending downward from the hinge support to the side edge and a second porous reinforcing member filling the space between the first reinforcing member and the outer panel, overlapping the glass upper edge, to enhance rigidity and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the back door inclination is reduced to improve aerodynamic resistance and design, then aerodynamic resistance is reduced and design is improved, but the back window glass mass increases requiring further rigidity improvement
Solution Approach 1:
The patent applies local quality by providing reinforcing members at specific critical locations (corners and edges of the back window glass) rather than uniformly reinforcing the entire back door. The first reinforcing member is positioned at the corner near the hinge, and the second reinforcing member is positioned at the edge overlapping the glass upper edge, targeting areas most susceptible to bending deformation.
Solution Approach 2:
The patent employs composite materials by combining the inner panel and outer panel with reinforcing members made of different materials. The reinforcing members can be made of metal or rigid foam material, creating a composite structure that enhances rigidity while allowing for reduced inclination angles and larger glass areas.
2Strength
If reinforcing members are added to improve back door rigidity, then rigidity is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the reinforcing structure into distinct, separate members rather than using a single complex reinforcement system. The first reinforcing member is positioned at the corner area, and the second reinforcing member is positioned at the edge area, creating modular reinforcement segments that can be independently designed and installed.
Solution Approach 2:
The patent uses local quality by providing reinforcement only at critical areas (corners and edges) rather than uniformly throughout the entire back door structure. This localized approach maintains simplicity in non-critical areas while providing targeted rigidity enhancement where bending deformation is most likely to occur.
3Shape
If a large back window glass is installed to improve design, then design is improved, but the glass mass increases requiring further rigidity improvement
Solution Approach 1:
The patent applies local quality by positioning reinforcing members specifically at critical locations related to the large glass area - the first reinforcing member at the corner near the hinge and the second reinforcing member at the edge overlapping the glass upper edge. This targeted reinforcement supports the larger glass mass without requiring uniform reinforcement of the entire door panel.
Solution Approach 2:
The patent employs another dimension by adding reinforcing members that extend in multiple directions - the first reinforcing member extends downward and outward from the hinge support, and the second reinforcing member extends horizontally along the edge. This multi-directional reinforcement structure provides enhanced support for the large glass area.
Data Source
AI summary
A back door attached to a rear of a vehicle body includes an inner panel, an outer panel facing the inner panel, a first reinforcing member laid on an outer side of the vehicle body and fixed to the inner panel together with a hinge, and a second reinforcing member including a porous portion and arranged to fill a first space between the first reinforcing member and the outer panel on an outer side in a width direction of the vehicle body from a hinge support that supports the hinge to overlap at least a part of a glass upper edge of a back window glass.