Fuel Tank Filler Neck Low-Permeation Layer Bonding
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Solution Overview
Problem
Fuel tank filler necks face challenges in preventing leakage of liquid fuel and fuel vapor due to gaps between dissimilar materials, leading to emissions and inefficiencies in fuel systems.
Innovation Solution
A low-permeation layer made of materials like polyarylamide is bonded to both the filler neck and its components, such as the inlet check valve and inlet cup, to create a unified, monolithic element that blocks emissions without mechanical locks or additional sealing, ensuring a fixed position and minimizing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dissimilar materials are used to construct the filler neck and its components, then manufacturing flexibility and component functionality are improved, but gaps form at interfaces leading to fuel and vapor leakage
Solution Approach 1:
The invention uses composite construction where dissimilar materials (metal filler neck and plastic components) are combined with a bonded low-permeation layer at the interface. This layer acts as a barrier that prevents fuel and vapor leakage while allowing the dissimilar materials to maintain their respective functional advantages.
Solution Approach 2:
The low-permeation layer serves as an intermediary element between the metal filler neck and plastic components. It mediates the interface by providing a bonding surface and simultaneously acting as a leakage barrier, enabling dissimilar materials to work together without direct contact.
2Reliability
If mechanical locks or additional sealing elements are used to prevent leakage, then sealing reliability is improved, but device complexity and assembly steps increase
Solution Approach 1:
The invention merges the sealing function and the structural function into a single low-permeation layer. This layer simultaneously provides the barrier against fuel leakage and the bonding interface for assembling components, eliminating the need for separate sealing elements like O-rings or gaskets.
Solution Approach 2:
The low-permeation layer is self-sealing and self-bonding. It adheres to both the metal filler neck and plastic components while inherently preventing leakage, without requiring additional mechanical locks or complex assembly procedures.
3Ease of manufacture
If dissimilar materials are bonded directly together, then assembly is simplified, but permeation and leakage occur at the material interface
Solution Approach 1:
The invention applies a low-permeation layer specifically at the critical interface region where dissimilar materials meet. This localized treatment provides high resistance to fuel vapor permeation exactly where needed, while the rest of the components maintain their original material properties and assembly simplicity.
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
This solution effectively prevents the leakage of liquid fuel and fuel vapor by forming a sealed interface, reducing emissions and enhancing the reliability of fuel systems by using bonded low-permeation layers made of the same or similar materials.
Implementation Method 1
a first portion of the wall includes a low-permeation layer configured to block permeation of liquid fuel and fuel vapor extant in the fuel-conducting passageway to an external environment
Implementation Method 2
bonding a low-permeation layer of a component to a low-permeation layer of the filler neck
Data Source
AI summary
A fuel tank filler neck apparatus includes a filler neck and a filler neck component mounted in a fuel-conducting passageway formed in the filler neck. The filler neck component could be a fuel tan inlet check valve or a closure cap mount.