Fuel Injector Suspension Mount Vibration Damping
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Solution Overview
Problem
Existing fuel-injection systems for mixture-compressing internal combustion engines with externally supplied ignition suffer from noise generation due to vibration transmission from fuel injectors to the cylinder head and fuel distributor rail, particularly in the case of electromagnetic high-pressure injectors, leading to irritating engine noise known as valve ticking.
Innovation Solution
A suspension mount with an elastically deformable element and retaining elements on both the fuel-connector and connecting-body sides, providing a flexible connection that decouples vibrations and noise, using materials like PEEK for high intrinsic damping and geometric designs such as disk-shaped or annular elements with specific cross-sections to achieve reduced stiffness and effective noise damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid connection is used to connect the fuel injector to the fuel distributor rail, then mechanical stability and connection strength are improved, but vibration transmission and noise generation increase
Solution Approach 1:
The patent employs a flexible connection element made of elastomeric material that acts as a vibration-damping intermediary between the fuel injector and the fuel distributor rail. This flexible element absorbs mechanical vibrations and prevents their transmission to the rigid fuel distributor rail, thereby reducing noise generation while maintaining connection integrity
Solution Approach 2:
The patent introduces an intermediary vibration-damping element that mediates the connection between the fuel injector and the fuel distributor rail. This intermediary component absorbs and dissipates vibration energy, preventing direct transmission of mechanical vibrations through the rigid connection, thus reducing noise while maintaining structural stability
2Object-generated harmful factors
If a flexible connection is used to connect the fuel injector to the fuel distributor rail, then vibration decoupling and noise reduction are improved, but connection strength and mechanical stability may be compromised
Solution Approach 1:
The patent utilizes composite construction by combining the rigid fuel injector and fuel distributor rail components with a flexible elastomeric connection element. This composite approach allows the rigid parts to maintain structural strength while the flexible element provides vibration decoupling and noise reduction, achieving both strength and noise reduction simultaneously
Solution Approach 2:
The flexible connection element is designed with specific geometric features and material properties that allow it to maintain adequate connection strength while providing vibration isolation. The elastomeric material and geometric design work together to ensure the connection can withstand operational forces while decoupling vibrations
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 significantly reduces noise in the fuel-injection system by effectively decoupling vibrations between the fuel injector and the fuel-conducting component, specifically the fuel distributor rail, thereby minimizing structure-borne noise and improving the overall operational quietness of the engine.
Implementation Method 1
using materials like PEEK for high intrinsic damping
Implementation Method 2
an elastically deformable element and retaining elements on both the fuel-connector and connecting-body sides, providing a flexible connection that decouples vibrations and noise
Data Source
AI summary
A suspension mount for fuel-injection systems is used to connect a fuel injector to a fuel distributor. A connecting body having an accommodation space is provided, a fuel connector of the fuel injector being able to be disposed at least partially in the accommodation space. In addition, a joining body is provided that is disposed, at least in sections, partially in at least one recess of the connecting body, the recess being connected to the accommodation space, and on which the fuel connector is able to be supported along a longitudinal axis of the accommodation space. The joining body also has an elastically deformable element, the elastically deformable element being disposed in such a way that the joining body permits elastic support of the fuel connector on the connecting body at least along the longitudinal axis. A fuel-injection system having such a suspension mount is also indicated.