Fuel Distributor Holder With Viscoelastic Decoupling Rings
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Solution Overview
Problem
Existing fuel injection system assemblies face issues with vibration damping and component fatigue due to high tightening torque, leading to uneven compression and scatter in insulating elements, which affects fixation and vibration damping performance.
Innovation Solution
A holder system with a prestressing element and decoupling elements, such as viscoelastic rings, that allows for adjustable vibration damping by setting a predetermined prestress independent of the fastening force, using a combination of flanging, press fits, and geometric designs to ensure uniform force distribution and reduce component stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spacer is designed to be a little too short, then there is play in the clamp between the insulation elements, which considerably impairs the function, so that this case is to be avoided. If the spacer is designed a little too long, then there is high local compression of the insulation elements, which cannot be avoided due to the high tightening torque required. This high pressure then leads to local component fatigue on the insulation elements
Solution Approach 1:
The holder is divided into functionally independent segments: a fastening body for mounting and a holding element for securing the fuel distributor, connected via decoupling elements. This segmentation allows independent optimization of each part's function without compromising the other.
Solution Approach 2:
Decoupling elements serve as intermediaries between the fastening body and holding element, absorbing vibrations and mechanical stresses. This intermediary structure protects the insulation elements from high local compression while maintaining reliable fixation.
2Reliability
If the tightening torque of the fastening element must be high, then the fixation is secure, but this leads to high local compression of the insulation elements and local component fatigue
Solution Approach 1:
Decoupling elements act as intermediaries that absorb vibrations and mechanical stresses between the fastening body and holding element, protecting the insulation elements from high compression while maintaining secure fixation.
Solution Approach 2:
The decoupling elements provide beforehand cushioning by being positioned between the fastening body and holding element to absorb vibrations and stresses before they can damage the insulation elements or cause component fatigue.
3Manufacturing precision
If the spacer is designed to be a little too long, then there is high local compression of the insulation elements, which cannot be avoided due to the high tightening torque required. This high pressure then leads to local component fatigue on the insulation elements, namely on the one hand in the area of the spacer and on the other hand on a stepped area of a sleeve
Solution Approach 1:
The holder is segmented into fastening body and holding element connected by decoupling elements, allowing the insulation elements to be compressed uniformly across their entire surface area rather than concentrating stress at specific points like spacers or stepped areas.
Solution Approach 2:
The design changes from a rigid spacer-based compression system to a flexible decoupling element system that can distribute compression forces, changing the mechanical parameters of how force is applied to the insulation elements.
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 system achieves improved vibration damping and reduced component stress by allowing for adjustable prestress settings, enhancing the acoustic behavior and mechanical decoupling of the fuel distributor from the internal combustion engine, while reducing production requirements and tolerances.
Implementation Method 1
The decoupling elements are designed in each case as spring elements, in particular as viscoelastic spring elements
Implementation Method 2
The decoupling elements are designed in each case as spring elements
Data Source
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AI summary
A holder (2) for fastening a component (3), in particular a fuel distributor (3), via a holding element (7) to an internal combustion engine (4) comprises decoupling elements (8, 9), a fastening body (5) and a fastening means (6). Here, the fastening body (5) is fastened by means of the fastening means (6) to the internal combustion engine (4). Furthermore, the holding element (7) is fastened via the decoupling elements (8, 9) to the fastening body (5). Moreover, a prestressing element (10) is provided which is connected to the fastening body (5), wherein a prestress of the decoupling elements (8, 9) is set by way of a predefined arrangement of the prestressing element (10) relative to the fastening body (5), in which predefined arrangement the connection of the prestressing element (10) to the fastening body (5) takes place. Furthermore, a system (1) having a holder (2) of this type is specified.