Fuel Injector Retaining Element for Noise Isolation
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Solution Overview
Problem
Existing high-pressure fuel injection systems for internal combustion engines have complex and numerous fastening elements, making initial assembly and potential disassembly during service cumbersome, and they often result in direct metallic contact between the fuel injector and the cylinder head, leading to noise transmission.
Innovation Solution
A simplified fastening system using a retaining element with non-parallel legs that pivot to create a clamping force, allowing radial tolerance compensation and reducing noise transmission by eliminating direct metallic contact, featuring a form fit and clamping mechanism to secure the fuel injector to the cup, which can be made from bent and embossed sheet metal for cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fastening elements are used to secure the fuel injector, then the fuel injector can be firmly fixed, but the number and complexity of fastening elements increases
Solution Approach 1:
The patent combines multiple fastening functions into a single integrated retaining element. This retaining element simultaneously provides mechanical retention, noise isolation, and positioning functions that were previously distributed across multiple separate components, thereby reducing fastening element complexity while maintaining fixing reliability
Solution Approach 2:
The retaining element is designed as a multi-functional component that serves multiple purposes: it secures the fuel injector mechanically, provides acoustic isolation through material selection, and enables radial tolerance compensation. This multi-functionality eliminates the need for separate fastening elements, reducing overall system complexity
2Device complexity
If direct metallic contact is used between fuel injector and cylinder head, then the structure is simple, but noise transmission increases
Solution Approach 1:
The patent introduces an acoustic isolation element as an intermediary between the fuel injector and the cylinder head. This element, made from elastomeric or polymeric materials, acts as a mediator that transmits mechanical forces while blocking noise transmission, thus reducing harmful noise without significantly increasing structural complexity
Solution Approach 2:
The retaining element is constructed from composite or specially selected materials that combine mechanical strength for fastening with acoustic damping properties. This use of composite materials allows the single component to fulfill both structural and acoustic isolation functions, addressing noise transmission without adding complex multi-component structures
3Reliability
If multiple fastening elements are used, then the fuel injector can be securely held, but assembly and disassembly effort increases
Solution Approach 1:
By merging multiple fastening functions into a single retaining element, the patent reduces the number of assembly and disassembly operations required. The single component design maintains secure holding of the fuel injector while significantly simplifying the assembly process, as technicians no longer need to manipulate multiple separate fastening elements
Solution Approach 2:
The patent employs homogeneous material properties within the retaining element to ensure uniform mechanical behavior and simplified assembly. The consistent material characteristics throughout the single component facilitate easier handling and installation compared to assemblies with multiple heterogeneous fastening 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
This solution reduces the complexity and number of fastening elements, enabling easier assembly and disassembly while effectively isolating noise sources, allowing for radial tolerance compensation and increased load capacity suitable for higher operating pressures.
Implementation Method 1
The first leg and the second leg are not oriented parallel to one another in an initial state. The first leg and the second leg of the holding element are at least partially pivoted in order to clamp the holding element in the at least one recess.
Implementation Method 2
a hold-down device is provided between the fuel injector and the connecting piece. The hold-down device is designed as a bow-shaped component.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to an arrangement (1) which is used in particular as a fuel injection system for high-pressure fuel injection in internal combustion engines, comprising a fuel distributor and multiple fuel injection valves. Each of the fuel injection valves is arranged on a cup (2) of the fuel distributor. At least one of the fuel injection valves is secured to the corresponding cup (2) by a retaining element (4). The retaining element (4) has a first limb (5) which is at least substantially straight and a second limb (6) which is at least substantially straight. The cup (2) has at least one recess (7, 8) which extends through a wall (9) of the cup (2). The first limb (5) and the second limb (6) are guided through the at least one recess (7, 8). Furthermore, the connecting sleeve (3) of the fuel injection valve has a collar (15) which is supported on the first limb (5) of the retaining element (4) and on the second limb (6) of the retaining element (4) in order to secure the fuel injection valve to the cup (2). In this manner, the fuel injection valve can be reliably secured to the cup (2).