Blind Hole Fastener Assembly for Electrical Isolation
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Solution Overview
Problem
Existing fastening systems for automotive components lack a reliable and efficient method to electrically isolate fastener components, which is crucial for preventing electrical conductivity between components.
Innovation Solution
A fastening system utilizing an isolating fastener assembly that includes a stamped-metal clip and a plastic isolating cap, where the isolating cap features torque interface features to engage the clip, ensuring electrical isolation and easy removal through a twist-and-pull motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metal fasteners are used to ensure mechanical strength, then the fastening connection is reliable, but electrical conductivity between components cannot be prevented
Solution Approach 1:
The fastener is divided into two separate components: a metal clip for mechanical fastening and a plastic isolating cap for electrical isolation. This segmentation allows each component to fulfill its specific function without compromise, resolving the contradiction between mechanical reliability and electrical isolation.
Solution Approach 2:
The plastic isolating cap acts as an intermediary component between the metal fastener and the components being fastened. It mediates the electrical isolation function while allowing the metal clip to provide mechanical strength, thus preventing harmful electrical conductivity while maintaining fastening reliability.
2Reliability
If a complex isolating fastener design is used to achieve electrical isolation, then electrical conductivity is prevented, but manufacturing complexity and assembly difficulty increase
Solution Approach 1:
By segmenting the fastener into a simple metal clip and a separate plastic cap, each component can be manufactured using standard, simple processes. The metal clip can be stamped and the cap can be molded independently, avoiding the need for complex manufacturing processes while achieving electrical isolation.
Solution Approach 2:
The two separate components (metal clip and plastic cap) are merged into a single fastening assembly through a simple snap-fit or interference fit connection. This merging provides electrical isolation functionality without requiring complex integrated manufacturing, thus maintaining ease of manufacture while achieving the isolation goal.
3Ease of operation
If a unitary fastener design is used to simplify assembly, then assembly is straightforward, but electrical isolation between components cannot be achieved
Solution Approach 1:
The fastener is segmented into two parts that are assembled together in a simple two-step process: inserting the metal clip and then placing the plastic cap. This segmented design achieves electrical isolation while maintaining assembly simplicity, as each component can be installed independently without complex procedures.
Solution Approach 2:
The plastic isolating cap serves multiple functions: it provides electrical isolation, protects the metal clip, and can be designed with features for both insertion and retention. This multi-functionality allows the cap to achieve electrical isolation while maintaining simple assembly and operation.
4Strength
If high-temperature resistant materials are used to maintain mechanical integrity at high temperatures, then the fastener remains strong, but manufacturing complexity and cost increase
Solution Approach 1:
The fastener system segments the high-temperature structural function (metal clip) from the electrical isolation function (plastic cap). The metal clip can be manufactured using simple stamping processes while providing high-temperature mechanical integrity, and the plastic cap can be molded using standard processes, thus maintaining manufacturing simplicity while achieving the required strength.
Data Source
AI summary
Described is an isolating fastener assembly for attaching a first component to a blind hole of a second component. The isolating fastener assembly includes a clip and an isolating cap. The clip having a retaining head portion and a body portion. The body portion including a pair of legs spaced apart and flexibly connected to one another at the retaining head portion to define a channel. The isolating cap having a pair of guides. Each guide having a fastener-retention feature to engage and retain the clip.