Integral Engine Firewall Seal for Thermal Movement and Leakage
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Solution Overview
Problem
Conventional engine firewall sealing assemblies experience leakage due to non-integral coupling, leading to cross-contamination between high and low temperature zones, despite efforts to prevent fuel, oil, and fume leakage.
Innovation Solution
A seal comprising a proximal part with a recess, a distal part with a notch, and a flexible intermediate part integrally extending between them, designed to integrate with aperture sealing assemblies on engine firewalls, using flexible and fire-resistant materials like silicon rubber to accommodate thermal expansions and prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple separate parts (intermediate housing, first seat member, second seat member) are used in the aperture sealing assembly, then the assembly can be manufactured and assembled separately, but non-integral coupling between parts causes fuel, oil or fume leakage between high and low temperature zones
Solution Approach 1:
The patent merges multiple separate sealing parts (intermediate housing, first seat member, second seat member) into a single integral sealing assembly. This eliminates the non-integral coupling interfaces that caused leakage, while the assembly can still be manufactured as a unified component. The integral structure ensures continuous sealing between high and low temperature zones without gaps at connection points.
2Strength
If a rigid sealing structure is used to prevent leakage, then sealing strength is improved, but the structure cannot accommodate thermal expansions and contractions during engine operation
Solution Approach 1:
The patent incorporates a flexible membrane or diaphragm within the integral sealing assembly that can deform elastically to accommodate thermal expansions and contractions. This flexible element maintains sealing integrity while adapting to dimensional changes during engine operation, preventing both leakage and structural failure under thermal stress.
Solution Approach 2:
The sealing assembly utilizes materials with appropriate thermal expansion coefficients that match the surrounding engine components. By selecting materials whose expansion characteristics change with temperature in a controlled manner, the seal maintains its sealing force and geometric integrity across the operating temperature range without compromising strength or adaptability.
3Ease of manufacture
If conventional sealing materials are used, then the sealing assembly can be manufactured easily, but the materials are not fire-resistant and cannot withstand high temperature zones
Solution Approach 1:
The patent employs composite materials that combine fire-resistant properties with manufacturability. The integral sealing assembly may use high-temperature resistant polymers, ceramic-matrix composites, or metal-matrix composites that can withstand exposure to high temperature zones and fire conditions while still being suitable for manufacturing processes. These composite materials provide both the required thermal resistance and fabrication feasibility.
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 seal effectively prevents leakage and cross-contamination by providing a strong, flexible, and fire-resistant barrier that withstands temperature and pressure differences, ensuring reliable separation of zones while accommodating thermal movements.
Implementation Method 1
a flexible intermediate part integrally extending between the proximal part and the distal part
Data Source
AI summary
Disclosed is a seal for an engine firewall. The seal including a proximal part having a recess; a distal part having a notch; and a flexible intermediate part integrally extending between the proximal part and the distal part.