Stiffened Fuel Injector Longitudinal Rib Extrusion
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Solution Overview
Problem
Long fuel injectors for internal combustion engines face challenges in maintaining concentricity due to warping caused by extrusion coating, which can lead to installation issues and loss of precision in fuel spray generation.
Innovation Solution
A fuel injector with an extrusion coat featuring a longitudinal rib extending along the axial direction, which provides stiffening and maintains concentricity, optionally with transverse ribs and reinforcement, ensuring stability and preventing warping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the fuel injector is made long to reach the combustion chamber from above, then the installation flexibility is improved, but the concentricity is lost due to warping from extrusion coating
Solution Approach 1:
The extrusion coat is segmented by the longitudinal rib that divides it into two separate halves. This segmentation prevents the coat from warping as a single unit during cooling, thereby maintaining concentricity while allowing the fuel injector to be made long for top installation.
Solution Approach 2:
The longitudinal rib creates an asymmetric structure within the extrusion coat, breaking the symmetry that would otherwise cause uniform warping. This asymmetric design allows the coat to cool without distorting the concentricity of the fuel injector, enabling long designs.
2Reliability
If the extrusion coat is applied to envelop the fuel supply pipe and current bar, then the protection and electrical connection are improved, but the warping increases causing loss of concentricity
Solution Approach 1:
The longitudinal rib segments the extrusion coat into two halves, preventing it from warping uniformly during cooling. This maintains the protective function and electrical connection reliability while preventing shape distortion and loss of concentricity.
3Manufacturing precision
If the fuel injector is made short for side installation, then the concentricity is maintained, but the installation options are reduced
Solution Approach 1:
The longitudinal rib segments the extrusion coat to prevent warping, enabling long fuel injector designs that can be installed from above. This resolves the limitation of short injectors for side installation, providing versatile installation options while maintaining concentricity.
Solution Approach 2:
The design parameter of fuel injector length is changed from short to long by implementing the longitudinal rib structure. This parameter change enables top installation while maintaining concentricity, expanding installation options.
4Manufacturing precision
If the longitudinal rib is made wide to increase stiffening, then the concentricity is maintained, but the device complexity increases
Solution Approach 1:
Instead of making the entire extrusion coat complex, the longitudinal rib is added as a localized feature that provides the necessary stiffening. This local quality change maintains concentricity without significantly increasing overall device complexity.
Solution Approach 2:
The longitudinal rib serves multiple functions: it segments the extrusion coat to prevent warping, provides structural stiffening, and maintains concentricity. This multi-functionality achieves concentricity maintenance without requiring multiple separate components, thus not increasing complexity.
Data Source
AI summary
A fuel injector for the injection of fuel, which includes a fuel supply element for supplying the fuel, a current bar which extends at least partially parallel to the fuel supply element, and an extrusion coat, which surrounds the fuel supply element and the current bar, the extrusion coat encompassing a longitudinal rib that extends in the axial direction of the fuel injector and is disposed on the fuel injector opposite the current bar.