Resin Vehicle Back Door Reinforcement With Movable Cord Members
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Solution Overview
Problem
Existing vehicle back door designs with firmly fixed reinforcing sheets concentrate stress on fixing parts, potentially leading to door body breakage.
Innovation Solution
A vehicle back door design featuring cord-like members with a cord-like body part routed between fixing points, mounted at these points, and held by intermediate brackets to allow movement, thereby distributing stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the reinforcing sheet is firmly fixed to the fixing part of the door body, then the reinforcing effect is improved, but stress concentration occurs on the fixing part, leading to potential breakage
Solution Approach 1:
The cord-like member transitions from a fixed rigid connection to a dynamic flexible connection. The cord can deform and move within the resin panel member, allowing stress to be distributed along its length rather than concentrated at fixed points. This dynamic flexibility resolves the contradiction by maintaining reinforcement while preventing stress concentration-induced breakage.
Solution Approach 2:
The invention changes the physical state and mechanical properties of the reinforcement from a rigid fixed sheet to a flexible cord-like structure embedded in the resin. This parameter change allows the reinforcement to adapt to stress variations and distribute loads more evenly, improving reliability while maintaining strength.
2Reliability
If a stretchable reinforcing sheet is provided in the door body, then the risk of large hole formation is reduced, but stress concentration may still occur at fixing parts
Solution Approach 1:
The invention extracts the fixing parts from the reinforcing structure, eliminating the source of stress concentration. Instead of fixing the cord at specific points, it is freely embedded in the resin panel member, allowing stress to be distributed continuously along the cord's path rather than concentrated at discrete fixing locations.
Data Source
AI summary
A vehicle back door has a first cord-like member disposed in a door body formed of a resin panel member. The first cord-like member has a wire that is routed in the panel member, a first mounting member that fixes the wire to the panel member, a second mounting member that fixes the wire to the panel member, and a bracket that movably holds an intermediate part between the first mounting member and the second mounting member of the wire.