Progressive Spring Decoupling Element for Fuel Injector Noise Reduction
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Solution Overview
Problem
Existing fuel injection devices face challenges in effectively reducing noise emissions, particularly during idling mode, due to the introduction of structure-borne forces that cause structural excitation and airborne noise, which are not adequately addressed by current intermediate elements with linear spring characteristics and complex damping systems.
Innovation Solution
A decoupling element with a nonlinear progressive spring characteristic is designed using a spring ring and conical washer, featuring a small design height and adjustable geometric parameters to achieve low stiffness during idling and high stiffness at nominal system pressure, allowing for effective noise decoupling and stable fuel injector positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a decoupling element with low stiffness is used during idling, then noise emissions are reduced, but the fuel injector becomes unstable at nominal system pressure
Solution Approach 1:
The decoupling element employs a progressive spring characteristic that dynamically adjusts its stiffness based on the applied load. At low loads (idling conditions), the spring remains relatively soft to provide effective vibration decoupling and reduce noise emissions. As the load increases (nominal system pressure), the spring progressively stiffens to ensure fuel injector stability and proper sealing ring function. This dynamic adaptation resolves the contradiction between noise reduction and stability.
Solution Approach 2:
The spring design incorporates geometric parameters (such as varying wire diameter or coil spacing) that cause the spring constant to change with compression distance. This parameter change allows the decoupling element to exhibit low stiffness at idle operating conditions for noise reduction, while automatically transitioning to high stiffness at nominal system pressure to maintain injector stability and sealing effectiveness.
2Object-affected harmful factors
If a progressive spring characteristic is implemented, then both noise damping and stability are achieved, but the design complexity increases
Solution Approach 1:
The progressive spring characteristic is achieved by modifying geometric parameters of the spring itself (such as varying the wire diameter along its length or changing coil spacing), rather than by adding separate components or complex mechanisms. This allows the decoupling element to provide both noise damping and stability functions through a single, relatively simple component with optimized geometry, minimizing design complexity while achieving the desired performance.
3Reliability
If multiple layers or parts are used for sealing and damping functions, then sealing and damping performance improve, but manufacturing complexity increases
Solution Approach 1:
The decoupling element is designed as a single multi-functional component that simultaneously provides both sealing and vibration damping functions. By integrating these functions into one element rather than using separate layers or parts, the design maintains reliable sealing and damping performance while significantly simplifying manufacturing and assembly processes.
Solution Approach 2:
The patent combines the sealing function and the damping function into a single decoupling element. This merging of functions eliminates the need for multiple separate components (such as separate sealing rings and damping layers), thereby reducing manufacturing complexity while maintaining the reliability of both sealing and damping performance.
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 decoupling element significantly reduces noise emissions during idling mode while maintaining the durability of sealing rings and ensuring a stable fuel spray, with a simple and cost-effective design that adapts to specific application requirements.
Implementation Method 1
the decoupling element significantly reduces the noise emanating from the cylinder head in the noise-critical idling mode
Implementation Method 2
The spring characteristic of the decoupling element according to the present invention may advantageously be designed to be progressive in a targeted manner by adjusting the geometric parameters of the spring ring in particular
Implementation Method 3
The low stiffness of the decoupling element at the idling point permits effective decoupling of the fuel injector from the cylinder head
Implementation Method 4
The great stiffness at a nominal system pressure ensures little movement of the fuel injector on the whole during operation of the vehicle, which thereby, on the one hand, ensures the durability of the sealing rings
Data Source
AI summary
A decoupling element is described for a fuel injection device which is characterized in particular by a low-noise design. The fuel injection device includes at least one fuel injector, a receiving bore in a cylinder head for the fuel injector, and the decoupling element between a valve housing of the fuel injector and a wall of the receiving bore. The decoupling element is designed as a decoupling system having a spring ring and a conical washer. The fuel injection device is suitable for injecting fuel into a combustion chamber of a mixture-compressing spark-ignition internal combustion engine in particular.