Fuel Shield Screen for Engine Top Orifice Masking
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Solution Overview
Problem
The existing configuration of internal combustion engines, with a fuel rail protection and oil decanter, fails to completely seal the interface between the fuel rail guard and the oil separator, leading to potential fuel spraying and fire hazards due to incomplete coverage by foam seals.
Innovation Solution
A screen is introduced at the junction between the fuel rail guard and the oil decanter, comprising multiple overlapping parts made from various components, to mask the orifice and prevent fuel projections, ensuring a sealed enclosure and enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a foam gasket is inserted between the oil separator and fuel rail guard, then some sealing is provided, but gaps remain and fuel spray prevention is incomplete
Solution Approach 1:
The screen is divided into multiple segments (first screen segment attached to lower oil separator element, second screen segment attached to fuel rail guard, third screen segment attached to upper oil separator element) that work together to mask the orifice. This segmentation allows the screen to adapt to the complex geometry while maintaining effective fuel spray prevention.
Solution Approach 2:
The screen acts as an intermediary element between the foam gasket and the external environment. While the foam gasket provides baseline sealing, the screen adds an additional protective layer that specifically addresses the orifice masking requirement, creating a multi-layered defense system.
2Ease of manufacture
If the oil separator is manufactured in two parts with a welded joint line, then manufacturing and integration is facilitated, but an orifice extends between the parts creating potential fuel spray paths
Solution Approach 1:
The screen extends in the radial dimension from both the lower and upper elements toward the center, creating overlapping coverage that masks the orifice. This dimensional approach allows the screen to effectively block fuel spray paths without interfering with the welded joint line configuration.
Solution Approach 2:
The screen segments are attached to the oil separator elements before final assembly with the fuel rail guard. This preliminary attachment ensures that the orifice is already masked by the time fuel-containing components are installed, preventing fuel spray exposure from the outset.
3Ease of manufacture
If the foam gasket provides partial coverage of the orifice, then some sealing is achieved, but about 60% of the orifice height remains exposed to fuel spray
Solution Approach 1:
The screen serves multiple functions simultaneously: it masks the orifice to prevent fuel spray exposure, works in conjunction with the foam gasket to provide comprehensive sealing, and adapts to the existing two-part oil separator construction. This multi-functionality achieves complete orifice coverage without requiring a complete redesign of the sealing system.
Data Source
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AI summary
The invention relates to an arrangement (200) for an internal combustion engine (2) comprising a fuel rail guard (20) and an oil separator (10) capped at least partially by the fuel rail guard (20), characterized in that the arrangement (200) includes a screen (100) extending at the level of a junction between the fuel rail guard (20) and the oil separator (10) in order to mask an orifice (O) between the fuel rail guard (20) and the oil separator (10).