Fuel Injector Support Ring Sealing Design
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Solution Overview
Problem
Existing fuel injectors face issues with sealing integrity under increased pressure, leading to potential radial gaps and risk of damage to the injector or connecting piece, especially due to manufacturing and installation tolerances.
Innovation Solution
A support ring with a V-shaped contact surface is introduced at the intake nozzle, allowing for minor radial movement and preventing radial gaps by distributing forces evenly across the sealing ring, ensuring secure sealing without extrusion or damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sealing ring is used to seal the intake nozzle with the receptacle cup, then the sealing structure is simple, but radial gaps may form under increased pressure leading to sealing failure
Solution Approach 1:
A support ring is introduced as an intermediary component between the sealing ring and the intake nozzle. The support ring features a V-shaped contact surface that interacts with the sealing ring, providing mechanical support and preventing radial displacement. This intermediary structure distributes forces evenly across the sealing interface, eliminating radial gaps while maintaining sealing integrity under pressure.
2Reliability
If the support ring is made with large radial extension to prevent radial gaps, then sealing reliability improves, but installation becomes difficult due to tight tolerances
Solution Approach 1:
The support ring is designed with non-uniform radial extension: the upper area featuring the V-shaped contact surface has slightly larger radial extension for force distribution, while the remaining axial extension has smaller radial extension for easy installation. This local differentiation allows the support ring to be pressed into the receiving space during installation, then provide comprehensive radial support during operation.
3Reliability
If the support ring is constrained to prevent any radial movement, then sealing is improved, but the fuel injector may be damaged due to stress concentration
Solution Approach 1:
The support ring is designed to allow controlled dynamic movement within the receiving opening while maintaining sealing. The V-shaped contact surface enables the support ring to adapt to minor radial displacements and manufacturing tolerances, preventing stress concentration. This dynamic capability protects both the fuel injector and connecting piece from damage while ensuring reliable sealing under varying operating conditions.
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 support ring effectively maintains sealing integrity under pressure, preventing radial gaps and allowing for axial movement, thus protecting the fuel injector and connecting piece from damage while ensuring reliable operation.
Implementation Method 1
These forces result in a minor elastic deformation of the support ring, namely in the thin-walled sections radially inside and outside below the contact surface in the radially slightly larger upper area
Data Source
AI summary
A fuel injector having an improved sealing of an intake nozzle with respect to the receiving opening of a fuel distribution rail. A support ring, which engages with the sealing ring on the intake side, is provided at the intake nozzle. The support ring includes a planar underside for resting on a shoulder of the intake nozzle and a V-shaped contact surface facing the sealing ring. The support ring, which is acted on by the sealing ring, is provided with the V-shaped conical contact surface for the sealing ring that ensures that in the case of increased pressures, a minor radial escape of the support ring is made possible to the radial inside and outside and thus radial gaps and an extruding of the sealing ring into same are prevented.