Vehicle Door Trim Fastener Assembly Rotational Guide
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Solution Overview
Problem
Conventional fastener assemblies for vehicle door trims are prone to easy removal when excessive force is applied, leading to decreased fastening force and damage, resulting in burrs on steel panels and noise during coupling and decoupling, which affects ride comfort and requires frequent replacement.
Innovation Solution
A fastener assembly with a head unit supported at four positions, featuring a guide part that rotates within a longitudinal hole, supported by first and second support members and a rib, which prevents removal and noise by applying tension through elastic pieces and limiting rotation, ensuring secure coupling and reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional fastener assembly structure is used, then the fastener can be easily inserted into the fastener bracket, but the fastener is easily removed when excessive force is applied and the fastening force decreases significantly after about five attachment cycles
Solution Approach 1:
The head unit is divided into multiple functional parts: a head part for insertion into the fixing part, a guide part for insertion into the longitudinal hole, and support members positioned at specific locations. This segmentation allows each part to perform its specific function - the head part provides insertion ease while the guide part and support members maintain fastening force through rotational coupling and positioning
Solution Approach 2:
The guide part is configured to be inserted into the longitudinal hole and rotated to couple the head unit to the fastening part. This dynamic rotational movement transforms the simple insertion action into a secure coupled state, allowing easy insertion while maintaining reliable fastening through the rotation mechanism
2Ease of operation
If a conventional fastener assembly structure is used, then the fastener can be attached and removed, but burrs are generated on the steel panel and the fastener is damaged
Solution Approach 1:
The head part is supported at four specific positions by the inner circumferential surface of the insertion hole, providing localized support points that distribute forces evenly. The guide part contacts the rear surface of the fastening part at specific locations, creating localized contact zones that prevent uneven stress concentration and burr generation during attachment and removal operations
3Device complexity
If the head unit is not properly supported, then the structure is simple, but the head unit deteriorates its fastened state and generates noise during coupling
Solution Approach 1:
The support members are pre-positioned at specific locations before the coupling operation. The first support member is located between the head part and guide part to overlap the upper surface of the fastening part, while the second support member is positioned to overlap the lower surface of the fixing part. This preliminary positioning ensures the head unit maintains its fastened state without requiring complex additional structures
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
The fastener assembly effectively prevents removal and noise, enhancing ride comfort by maintaining secure attachment and allowing for the reuse of trim components without damage, thereby improving user experience.
Implementation Method 1
applying tension through elastic pieces
Data Source
AI summary
A fastener assembly includes a head unit, a fastening part allowing a lower end of the head unit to be coupled thereto, and a fixing part allowing an upper end of the head unit to be inserted thereinto. The head unit includes a head part inserted into an insertion hole of the fixing part, and a guide part configured to be inserted into a longitudinal hole formed in the fastening part and to be in contact with a rear surface of the fastening part, the guide part being configured to be inserted into the longitudinal hole and be rotated such that the head unit is coupled to the fastening part.