Fuel Injector Connecting Element With Elastic Vibration Decoupling
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Solution Overview
Problem
Existing fuel injection systems for spark-ignited internal combustion engines experience noise issues due to vibration transmission from fuel injection valves, leading to unwanted noise development, particularly in Otto engines with direct injection, caused by the rapid opening and closing of the fuel injection valve.
Innovation Solution
A connecting element with a soft suspension mechanism that decouples the fuel injector from the fuel-carrying component, utilizing an elastically deformable decoupling element to absorb vibrations and reduce noise, while maintaining the required strength and rigidity, especially at high system pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid connecting element is used to connect the fuel injector to the fuel-carrying component, then the connection strength and stability are improved, but vibrations and noise are transmitted more effectively
Solution Approach 1:
The patent introduces a decoupling element as an intermediary component between the fuel injector and the fuel-carrying component. This decoupling element absorbs vibrations and prevents their transmission to the fuel rail, while still maintaining the necessary connection strength and stability for high-pressure fuel injection operations.
Solution Approach 2:
The decoupling element is made from elastomeric material, representing a composite or viscoelastic material that combines the properties of flexibility (for vibration absorption) with sufficient structural integrity (for maintaining connection strength under high pressure).
2Object-generated harmful factors
If a soft suspension design is used to reduce vibrations, then noise development is reduced, but the connection rigidity and strength may be compromised
Solution Approach 1:
The patent carefully selects and designs the decoupling element with specific elastomeric material properties that provide optimal vibration absorption while maintaining sufficient connection rigidity. The material parameters (elasticity, damping characteristics) are chosen to balance noise reduction with the structural requirements of high-pressure fuel injection.
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 solution effectively reduces noise development by decoupling the fuel injector from the fuel-carrying component, ensuring a significant reduction in structure-borne noise and vibrations, thereby improving the overall noise profile of the engine.
Implementation Method 1
a decoupling element (26), in particular formed from an elastomeric material, which, in the assembled state, is connected to the base body (7) on the one hand and to the fuel connector (4) on the other hand
Data Source
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AI summary
A connecting element (1) for fuel injection systems (3) serves to connect a fuel injection valve (2) to a fuel-carrying component (45). A base body (7) is provided in which a receiving chamber (11) for a fuel nozzle (4) of the fuel injection valve (2) is provided. The fuel nozzle (4), which is at least partially located in the receiving chamber (11), is supported at least indirectly by the base body (7). The fuel nozzle (4) is elastically supported on the base body (7) in a radial direction (23). Furthermore, a fuel injection system (3) with such a connecting element (1) is specified, wherein the fuel injection valve (2) is connected to the component (45) via the connecting element (1).