Progressive Spring Decoupling Element for Fuel Injector Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fuel injection devices face challenges in effectively reducing noise emissions during idle operation due to structural vibrations transmitted to the cylinder head, which are exacerbated by increasing nominal operating pressures and limited by the stiffness and complexity of existing intermediate elements.
Innovation Solution
A decoupling element with a bilinear or non-linear progressive spring characteristic, comprising a contoured spring seat and a spring washer, which provides low stiffness for noise decoupling during idle operation and high stiffness at nominal pressures to maintain fuel injector stability and durability, while being simple, cost-effective, and robust against contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional flat intermediate element is used, then manufacturing and assembly tolerances are compensated, but noise emissions during idle operation are not sufficiently reduced
Solution Approach 1:
The patent changes the spring characteristic from linear to progressive (bilinear or non-linear), where the stiffness increases with compression. This allows the decoupling element to provide low stiffness at idle for noise reduction while maintaining high stiffness at operating pressure for stability.
Solution Approach 2:
The decoupling element is designed to be dynamically adaptive, changing its stiffness characteristic based on the compression force. At low forces (idle operation), it remains soft to decouple vibrations; at high forces (operating pressure), it becomes stiff to maintain positioning stability.
2Object-generated harmful factors
If a multilayer intermediate element with muffling material is used, then noise muffling is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the decoupling function and the progressive spring characteristic into a single integrated decoupling element, eliminating the need for multiple separate layers of muffling materials while achieving effective noise reduction.
Solution Approach 2:
The patent extracts the essential noise reduction function from complex multilayer muffling structures and implements it through a simplified progressive spring mechanism that inherently provides vibration decoupling without requiring multiple material layers.
3Object-generated harmful factors
If a decoupling element with low stiffness is used, then noise decoupling during idle operation is improved, but fuel injector stability at operating pressure deteriorates
Solution Approach 1:
The progressive spring characteristic changes the stiffness parameter dynamically: low stiffness at idle compression for noise decoupling, transitioning to high stiffness at operating pressure for fuel injector stability and sealing ring protection.
Solution Approach 2:
The decoupling element transitions from a static low-stiffness design to a dynamic progressive spring design that adapts its stiffness based on the applied load, providing optimal performance across different operating conditions.
4Object-generated harmful factors
If a progressive spring characteristic is implemented, then noise decoupling and stability are improved, but manufacturing complexity increases
Solution Approach 1:
The progressive spring characteristic is achieved by changing geometric parameters (contour shaping, thickness variation) of the decoupling element, which can be manufactured using standard forming processes without requiring complex assembly or additional components.
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 idle operation, ensures fuel injector stability, and maintains sealing integrity by effectively decoupling the fuel injector from the cylinder head, with a design that is easy to manufacture and assemble, and resistant to contamination.
Implementation Method 1
The decoupling element has an approximately bilinear or non-linear, progressive spring characteristic... The low stiffness of the decoupling element at an idle point enables an effective decoupling of the fuel injector from the cylinder head
Implementation Method 2
The decoupling element has an approximately bilinear or non-linear, progressive spring characteristic, due to which multiple positive and advantageous aspects result with the installation of the decoupling element in a fuel injection device
Data Source
AI summary
The decoupling element for a fuel injection device according to the invention is characterized in particular in that a low noise design is implemented. The fuel injection device includes at least one fuel injector and a receiving borehole 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 borehole. The decoupling element is a decoupling system made up of a contoured spring seat on a shoulder of the receiving borehole and a spring washer resting on the shoulder. The fuel injection device is suited in particular for direct injection of fuel into a combustion chamber of a mixture-compressing spark-ignition internal combustion engines.