Vehicle Door Lining Tray Section Screw Retention
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Solution Overview
Problem
Existing vehicle interior parts face issues with screw parts being inadvertently dropped during assembly, water collection, and inadequate impact absorption.
Innovation Solution
A vehicle interior part with a tray section featuring openings smaller than the screw part, preventing screw drop, allowing water drainage, and providing impact absorption through crack formation at the openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the interior part is fastened using a screw member through a fastening hole, then the interior part can be securely attached to the door lining, but the screw member may be inadvertently dropped into the interior part during assembly
Solution Approach 1:
The tray section acts as an intermediary structure between the fastening hole and the interior space. It provides a catching surface that intercepts the screw member during the assembly process, preventing it from falling into the interior part while still allowing the screw to pass through the fastening hole for secure attachment.
2Reliability
If the tray portion is made solid without openings, then it can prevent screw parts from falling through, but water that enters the tray portion will collect and accumulate
Solution Approach 1:
The tray section has different local properties: the edges and rim structure provide solid containment to catch and retain the screw member, while the bottom surface includes openings that allow water to pass through. This local differentiation of quality enables the tray to simultaneously perform screw retention and water drainage functions.
3Strength
If the tray section is made rigid and solid, then it provides structural strength, but it cannot absorb impact loads from external forces
Solution Approach 1:
The tray section is designed with inherent structural weaknesses or stress concentration points at strategic locations. When impact loads are applied, these predetermined weak points fail first, allowing the tray to deform and absorb impact energy before the main structural components are damaged, thus protecting the overall interior part.
4Productivity
If the opening in the tray section is made larger, then water can drain more easily, but the screw member may fall through the opening
Solution Approach 1:
The opening dimensions are designed asymmetrically relative to the screw member geometry. The opening size and shape are specifically configured to be smaller than the critical dimensions of the screw member (such as the shaft diameter or head width), ensuring the screw cannot pass through while still allowing water to drain efficiently through the same opening.
Data Source
AI summary
An interior part (13) for a vehicle is attached to the inner panel (31) of a door (12). The interior part (13) has: a fastening hole (43) formed in order to allow a screw part (42) which is used to fasten the interior part (13) to the inner panel (31) to be passed therethrough; a tray section (44) formed below the fastening hole (43); and an opening (45) formed in the tray section (44) in a size which does not permit the screw part (43) to pass through the opening (45).