Decoupling Element Nonlinear Spring Fuel Injector Noise
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Solution Overview
Problem
Existing fuel injection devices face challenges in effectively reducing noise emissions, particularly during idling mode, due to structural excitation from forces introduced into the cylinder head during fuel injector operation, which is not adequately addressed by complex and costly noise-damping solutions.
Innovation Solution
A decoupling element with a nonlinear progressive spring characteristic is designed as a solid-state joint, featuring a bearing collar with a spherical valve contact surface and microslots, providing effective decoupling and noise reduction with a simple structure, adjustable stiffness, and minimal movement of the fuel injector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If complex multilayer intermediate elements are used to achieve noise damping, then noise emissions are reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies parameter changes by modifying the stiffness characteristic of the decoupling element through a nonlinear progressive spring design. The element transitions from low stiffness at idle to high stiffness at operating pressure, achieving effective noise damping without requiring complex multilayer structures. This single-element solution with variable stiffness parameters replaces complicated assemblies while maintaining noise reduction performance.
2Object-affected harmful factors
If low stiffness decoupling is used to reduce noise at idle, then noise emissions are reduced, but fuel injector stability and sealing reliability deteriorate
Solution Approach 1:
The patent implements dynamics by designing a decoupling element with pressure-dependent stiffness characteristics. At idle conditions, the element maintains low stiffness to minimize noise transmission, while under operating pressure, it automatically transitions to high stiffness to ensure fuel injector stability and sealing reliability. This dynamic adaptation resolves the contradiction between noise reduction and reliability.
3Reliability
If high stiffness support is used to ensure fuel injector stability, then sealing durability is improved, but noise emissions increase
Solution Approach 1:
The patent resolves this contradiction through parameter changes by implementing a nonlinear progressive spring characteristic in the decoupling element. The stiffness parameter varies with applied pressure: low at idle to reduce noise, and high during operation to ensure stability and sealing durability. This pressure-dependent parameter adjustment allows the system to optimize both noise performance and reliability under different operating conditions.
4Device complexity
If simple washer-type intermediate elements are used, then device complexity is reduced, but noise damping capability is insufficient
Solution Approach 1:
The patent overcomes the limitations of simple washers by implementing parameter changes through a nonlinear progressive spring design. The decoupling element features variable stiffness that adapts to operating conditions, providing superior noise damping compared to conventional fixed-stiffness washers. This approach maintains structural simplicity while achieving enhanced noise reduction through intelligent parameter variation.
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 by decoupling the fuel injector from the cylinder head, ensuring durability of sealing rings and stable fuel spray, while maintaining a stable spring point and reducing structural excitation.
Implementation Method 1
The decoupling element significantly reduces noise emissions during idling mode by decoupling the fuel injector from the cylinder head
Implementation Method 2
A decoupling element with a nonlinear progressive spring characteristic is designed as a solid-state joint
Implementation Method 3
featuring a bearing collar with a spherical valve contact surface and microslots
Implementation Method 4
The decoupling element has a nonlinear progressive spring characteristic, which results in several positive and advantageous aspects
Implementation Method 5
The great stiffness at a nominal system pressure ensures little movement of the fuel injector on the whole during operation of the vehicle
Data Source
AI summary
A decoupling element for a fuel injection device has a low-noise construction. The fuel injection device includes at least one fuel injector and one 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 has a nonlinear progressive spring characteristic as a solid-state joint, at least one bearing collar including a valve contact surface, which is designed to be spherical, i.e., convex, extending upward from a flat annular area, the flat annular area being supported on a supporting base, and the inside of the annular area has a smaller inside diameter D than the bearing collar and the supporting base, which is supported on the wall of the receiving bore.