Fuel Rail Mount With Metal Shock Absorber
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Solution Overview
Problem
Direct injection fuel rails in internal combustion engines experience high fuel pressure-induced vibrations, leading to undesirable noise, which existing elastomeric solutions fail to effectively dampen due to limited control over vibration frequencies and rapid wear.
Innovation Solution
A fuel rail mounting assembly featuring a metal shock absorber with springs positioned between a bracket and a fastener, utilizing isolator washers to provide tunable stiffness and absorb vibrations, thereby reducing noise and supporting high pressure loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If elastomeric washers or O-rings are used to dampen vibrations, then vibration damping is improved, but control over vibration frequencies deteriorates and wear increases
Solution Approach 1:
The patent changes the material parameter from elastomeric to metal, and modifies the structural parameters by introducing springs and adjustable fasteners. This allows precise control over vibration frequencies while maintaining durability under high fuel pressure conditions.
Solution Approach 2:
The mounting assembly incorporates springs that can dynamically adjust to vibration frequencies. The metal shock absorber with springs provides adaptive damping that can respond to varying vibration conditions while maintaining frequency control.
2Reliability
If metal shock absorber with springs is used, then frequency control and durability are improved, but device complexity increases
Solution Approach 1:
The mounting assembly is divided into separate functional components: metal shock absorber, springs, bracket, and fastener. This segmentation allows each component to perform its specific function efficiently while enabling easier assembly and maintenance.
Solution Approach 2:
The solution uses composite construction combining metal shock absorber with springs, integrating multiple materials and functions into a unified mounting assembly that achieves both durability and frequency control.
3Device complexity
If simple mounting assembly is used, then device complexity is reduced, but ability to support high pressure loads and reduce noise deteriorates
Solution Approach 1:
The metal shock absorber acts as an intermediary element between the fuel rail and cylinder head, absorbing and dampening vibrations before they can transmit noise to the engine structure, while still maintaining a relatively simple overall 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 engine noise by controlling vibration frequencies and maintaining durability under high pressure conditions, enhancing the stability and longevity of the fuel rail mounting system.
Implementation Method 1
a metal shock absorber positioned between the bracket and the fastener to dampen vibrations between the fuel rail assembly and the cylinder head
Implementation Method 2
the metal shock absorber includes springs on either side of the bracket which are compressed between the cylinder head and a bolt which is threaded into the cylinder head
Data Source
AI summary
An internal combustion engine direct injection fuel injector system includes a fuel rail which is welded to a fuel rail bracket. A fuel rail mounting sleeve has a flange and is bolted to the engine cylinder head. The bracket fits around the flange and is held in place by a steel washer and a pair of stepped isolator washers which are positioned in pockets formed on either side of the bracket. The isolator washers serve as springs which form a shock absorber between the bracket and cylinder head. Compression forces on the bracket and isolator washers are controlled by bolt tension.