Fuel Injector Isolation Seat Vibration Damping
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Solution Overview
Problem
Direct injection fuel delivery systems in internal combustion engines generate noise-producing high-frequency vibrations due to pressure pulsations, which are transmitted to the engine structure, causing noise and potential damage.
Innovation Solution
An isolated fuel delivery system is designed with a fuel rail and direct injection fuel injector, featuring a fuel injector isolation seat assembly comprising a Belleville-type washer and elastomeric ring member to bias the injector away from the cylinder head, along with a secondary frusto-conical seal to reduce vibration transmission and maintain sealing integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the fuel injector is directly mounted to the cylinder head, then the structural simplicity and ease of manufacture are improved, but the transmission of noise-producing vibrations to the engine structure increases
Solution Approach 1:
The patent introduces an isolation seat assembly as an intermediary component between the fuel injector and the cylinder head. This assembly includes a compliant element (such as a rubber or elastomeric material) that acts as a mediator to decouple the fuel injector from the engine structure, thereby reducing the transmission of vibrations while maintaining a relatively simple overall structure.
Solution Approach 2:
The isolation seat assembly utilizes a flexible or compliant element (such as a rubber mounting or elastomeric seal) that can deform to absorb and isolate vibrational energy. This flexible component allows the fuel injector to be mounted to the cylinder head while preventing the direct transmission of high-frequency vibrations to the engine structure.
2Object-affected harmful factors
If the fuel injector is isolated from the cylinder head using a compliant element, then the vibration transmission is reduced, but the sealing integrity may be compromised
Solution Approach 1:
The patent combines multiple functions into the isolation seat assembly by integrating both the vibration isolation feature and the sealing function into a single component or assembly. The compliant element is designed to provide both vibration isolation and sealing, eliminating the need for separate isolation and sealing components, thereby maintaining sealing integrity while reducing vibrations.
Solution Approach 2:
The isolation seat assembly may utilize composite materials or multi-layer constructions where a compliant elastomeric material is combined with rigid sealing surfaces. This composite approach allows the assembly to provide both vibration isolation (through the compliant material) and reliable sealing (through the rigid sealing surfaces and precise geometric fit).
3Strength
If a rigid mounting is used for the fuel injector, then the structural strength and stability are improved, but the isolation of high-frequency vibrations is reduced
Solution Approach 1:
The patent transitions from a static rigid mounting to a dynamic isolation system where the compliant element can deform in response to vibrational forces. This dynamic behavior allows the mounting to maintain structural strength during normal operation while providing vibration isolation during high-frequency pulsations, effectively adapting to different operational conditions.
Solution Approach 2:
The isolation seat assembly changes the mechanical parameters of the mounting system by introducing a compliant element with specific elastic properties. This modifies the stiffness, damping, and frequency response characteristics of the mounting, allowing it to maintain structural integrity while isolating high-frequency vibrations through controlled deformation of the compliant material.
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 effectively isolates noise-producing vibrations from the fuel injector to the engine, reducing noise and potential damage while maintaining precise fuel delivery and sealing, and can adapt to varying engine loads by adjusting the stiffness of the isolation seat assembly.
Implementation Method 1
The fuel injector isolation seat assembly includes a spring washer, such as a Belleville-type washer, and an elastomeric ring member. The fuel injector isolation seat assembly operates to bias the fuel injector away from the land to substantially isolate the fuel injector from the head.
Implementation Method 2
The fuel injector isolation seat assembly operates to bias the fuel injector away from the land to substantially isolate the fuel injector from the head
Implementation Method 3
The elastomeric ring member may be sufficiently configured to sealingly engage the fuel injector
Implementation Method 4
A secondary seal, having a generally frusto-conical shape and formed from an elastomeric material, may be provided. The secondary seal operates to sealingly engage the generally stepped injector bore and the tip portion
Data Source
AI summary
An isolation seat assembly for a fuel injector that is at least partially disposed within a stepped bore defined by a cylinder head, the stepped bore includes a land. The isolation seat assembly includes a cupped spring washer and an elastomeric ring member disposed between the cupped spring washer and the land. The isolation seat assembly operates to bias the fuel injector away from the land to substantially isolate the fuel injector from the head. The cupped spring washer and elastomeric ring member may be bonded to one another. Additionally, the isolation seat assembly may include a washer member between the elastomeric ring member and the land. The washer member operates to distribute axial forces from the fuel injector to the land. At least a portion of the washer member may be crimped into engagement with the cupped spring washer, thereby capturing the elastomeric ring member therein between.