Fuel Injection Valve Plated Layer Elastic Modulus Control
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Solution Overview
Problem
Fuel injection valves in internal combustion engines face corrosion issues due to high stress areas where the plated layer is prone to cracking, leading to insufficient corrosion resistance despite plating, especially when exposed to acidic components in combustion chamber moisture.
Innovation Solution
A corrosion-resistant configuration is implemented by applying a plated layer with a chromium component and an indentation elastic modulus greater than the characteristic change elastic modulus, which restricts crack occurrence and ensures sufficient corrosion resistance by allowing the plated layer to elastically deform with the base material under tensile stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plated layer is applied to the fuel injection valve, then corrosion resistance is improved, but the plated layer cracks under high stress conditions
Solution Approach 1:
The patent changes the mechanical parameters of the plated layer by controlling its elastic modulus to be within a specific range (1.8-2.2 times the base material's elastic modulus). This parameter optimization allows the plated layer to flexibly deform with the base material under stress, preventing crack formation while maintaining corrosion resistance.
Solution Approach 2:
The patent creates a composite structure consisting of a base material and a plated layer with specifically controlled mechanical properties. The plated layer is designed as a composite coating system where the elastic modulus relationship between the plated layer and base material is precisely managed to achieve both corrosion protection and stress resistance.
2Reliability
If the plated layer is made harder to improve corrosion resistance, then it becomes more prone to cracking under tensile stress
Solution Approach 1:
The patent optimizes the elastic modulus parameter of the plated layer to fall within a specific range rather than maximizing hardness. This parameter change enables the plated layer to maintain adequate corrosion resistance while possessing sufficient flexibility to withstand tensile stress without cracking.
Solution Approach 2:
The patent designs the plated layer as a flexible protective film with controlled mechanical properties. The plated layer is engineered to have appropriate flexibility (elastic modulus within 1.8-2.2 times the base material) allowing it to deform elastically under stress, preventing crack formation while providing corrosion protection.
3Reliability
If the plated layer is applied to high stress portions, then corrosion protection is enhanced, but the plated layer is more likely to break
Solution Approach 1:
The patent changes the mechanical parameters of the plated layer, specifically controlling its elastic modulus to be within a specific range (1.8-2.2 times the base material's elastic modulus). This parameter optimization allows the plated layer to flexibly deform with the base material under stress, preventing crack formation while maintaining corrosion resistance.
Solution Approach 2:
The patent applies a plated layer with pre-engineered mechanical properties (controlled elastic modulus) that acts as a cushioning protective layer. This pre-configured plated layer can absorb and distribute stress energy, preventing crack initiation and propagation in high-stress areas while maintaining corrosion protection.
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 the breakage probability of the plated layer and ensures sufficient corrosion resistance, protecting the base material from damage by preventing moisture penetration and corrosion, even under high tensile stress conditions.
Implementation Method 1
the plated layer to elastically deform with the base material under tensile stress
Implementation Method 2
preventing moisture penetration and corrosion
Data Source
AI summary
A first member has a plated layer. A second member is pressed against the plated layer and causes a tensile stress in the first member. A breakage probability is a probability of breakage of the plated layer caused by the tensile stress. A characteristic line represents a relationship between an elastic modulus of the plated layer and the breakage probability. A characteristic slope of the characteristic line is a ratio of an increase in the breakage probability to a decrease in the elastic modulus. A characteristic change point appears on the characteristic line at which the elastic slope increases to exceed a predetermined slope as the elastic modulus gradually decreases. A characteristic change elastic modulus is the elastic modulus at the characteristic change point. The plated layer contains at least a chromium component and has the elastic modulus larger than the characteristic change elastic modulus.