Compensating Fastener Assembly for Misalignment and Thermal Movement
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Solution Overview
Problem
Fastener assemblies in automotive and other applications face challenges such as misalignment, multi-directional loading, and exposure to extreme conditions like extreme temperatures and corrosive substances, leading to potential failure and reduced lifespan.
Innovation Solution
A compensating fastener assembly incorporating a compression limiter and a spring, where the spring is configured to be compressed between the flange and a retention feature of the compression limiter, allowing for secure attachment to a surface element and accommodating movement, while a conical wire spring provides axial alignment and compression to secure a fastener, thereby tolerating extreme conditions and ensuring effective performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional fastener assembly is used to secure components, then the components can be held together, but the assembly cannot accommodate misalignment or movement between components and is susceptible to corrosion and failure under extreme conditions
Solution Approach 1:
The fastener assembly incorporates a spring mechanism that allows dynamic adjustment and movement between the fastener and the compression limiter. This spring-loaded design enables the assembly to accommodate misalignment and thermal expansion/contraction while maintaining secure fastening, thereby improving both reliability and adaptability simultaneously
2Reliability
If the fastener assembly is made more robust to withstand extreme conditions, then resistance to corrosion and failure improves, but the complexity of the assembly increases
Solution Approach 1:
The compression limiter serves as an intermediary component between the spring and the fastener, protecting the fastener from direct exposure to corrosive environments and extreme conditions. This mediator approach allows the use of simpler, less corrosion-resistant fasteners while maintaining overall assembly reliability, thereby improving resistance to corrosion without significantly increasing complexity
3Adaptability or versatility
If the fastener assembly is designed to accommodate movement and misalignment, then adaptability improves, but the precision and stability of the fastening connection deteriorates
Solution Approach 1:
The spring mechanism provides localized compliance and movement accommodation at specific points in the fastener assembly, while the overall fastening connection maintains precise and stable engagement. This local quality approach allows adaptability without compromising the precision of the primary fastening function
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 compensating fastener assembly enhances the lifespan and performance by accommodating misalignment and extreme conditions, reducing the risk of corrosion and failure, while allowing for easy installation and accommodating varying component thicknesses and thermal changes, thus providing effective load limitation and vibration damping.
Implementation Method 1
a spring configured to be compressed between the flange and a retention feature of the compression limiter
Implementation Method 2
providing effective load limitation and vibration damping
Data Source
AI summary
A compensating fastener assembly is configured to secure a fastener to a surface element. The compensating fastener assembly includes a compression limiter having a cylindrical main body and a flange, the cylindrical main body defining a channel and a longitudinal axis. The compensating fastener assembly further includes a spring defining a central passage. The central passage of the spring is configured to receive the main body of the compression limiter such that a first end of the spring is configured to be disposed adjacent the flange of the compression limiter.