Fuel Injector Mount Vibration Isolation
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Solution Overview
Problem
Direct injection fuel systems experience vibration and noise due to high-pressure fuel pulsations, leading to wear and undesirable noise transmission, particularly at idle speeds, and existing suspension designs are not flexible enough to support various injector configurations.
Innovation Solution
A fuel injector assembly featuring a fuel rail cap with a 'C' shaped clip and circumferentially spaced slots, combined with a shock-absorbing mounting assembly using isolator washers and a bolt-sleeve system to suspend the fuel injector without direct contact with the cylinder head, providing adjustable stiffness to mitigate vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fuel injectors are directly mounted on the cylinder head, then the mounting structure is simple, but vibration and noise increase due to direct contact with high-pressure fuel pulsations
Solution Approach 1:
The patent introduces a mounting assembly with isolator washers as an intermediary between the fuel injector and the cylinder head. The isolator washers act as a mediator that decouples the direct mechanical connection, allowing the fuel injector to be suspended without direct contact with the cylinder head, thereby reducing vibration and noise transmission while maintaining structural support.
Solution Approach 2:
The patent extracts the fuel injector from direct contact with the cylinder head by suspending it using a mounting assembly. The isolator washers are positioned between the fuel injector flange and the cylinder head, effectively separating the fuel injector from the solid mounting surface to reduce harmful vibrations and noise.
2Object-affected harmful factors
If fuel injectors are suspended from the fuel rail, then vibration and noise are reduced, but the design becomes complicated and lacks flexibility for various injector configurations
Solution Approach 1:
The mounting assembly is designed as a universal solution that can accommodate various fuel injector configurations. The isolator washers and mounting bracket configuration can be adapted to different injector types and engine layouts, providing a flexible yet effective vibration reduction system that works across multiple applications without requiring complex custom designs.
3Reliability
If isolator washers are used to suspend the fuel injector, then wear and noise are reduced, but the mounting assembly becomes more complex
Solution Approach 1:
The isolator washers are positioned in advance between the fuel injector flange and the cylinder head mounting surface to provide cushioning against vibrations and shocks before they can cause wear. This prior cushioning protects the sealing surfaces and reduces noise generation, enhancing reliability while adding only a simple washer component to the mounting assembly.
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 effectively reduces wear and noise by isolating the fuel injector from vibrations, enhancing durability and reducing unwanted noise transmission to other engine components, while supporting high fuel pressure loads with adjustable stiffness for various engine configurations.
Implementation Method 1
A shock-absorbing mounting assembly using isolator washers and a bolt-sleeve system to suspend the fuel injector without direct contact with the cylinder head, providing adjustable stiffness to mitigate vibration and noise
Implementation Method 2
providing adjustable stiffness to mitigate vibration and noise
Data Source
AI summary
A direct fuel injection fuel system includes a fuel rail cap and a fuel injector received within the fuel rail cap. A clip extends through slots in the fuel rail cap and engages the fuel rail to support the fuel rail within the fuel rail cap. The fuel rail cap includes a groove adjoining the slots to accept a portion of the clip. The clip engages a shoulder on the fuel injector assembly. The shoulder may be on the injector body or on an adapter secured to the injector body.