Oil Ring Metal Coating for Sludge Adhesion Prevention
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Solution Overview
Problem
Internal combustion engine oil rings face issues with adhesion and deposition of oil sludge, leading to clogged lubricating oil passages and reduced functionality, especially during long-time engine operation, as existing fluorine-containing coatings are not heat-resistant enough to maintain their effectiveness.
Innovation Solution
A metal coating with a surface free energy of 40 mJ/m2 or less and hydrogen bonding strength of 1.0 mJ/m2 or less is applied to the oil ring, providing a heat-resistant barrier that prevents oil sludge adhesion and deposition, ensuring the oil ring's functionality is maintained over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fluorine-containing coating is applied to prevent oil sludge adhesion, then oil sludge deposition is reduced, but heat resistance is insufficient at high operating temperatures
Solution Approach 1:
The patent changes the surface free energy parameter of the coating from conventional fluorine-containing coatings (higher surface energy) to a coating with surface free energy of 40 mJ/m² or less. This parameter change enables the coating to maintain both oil sludge repellency and heat resistance at engine operating temperatures, resolving the contradiction between adhesion prevention and thermal stability.
Solution Approach 2:
The patent employs a composite coating structure comprising a base coat and a top coat with specific surface energy characteristics. The composite material approach combines the heat resistance of the base coating with the low surface energy properties of the top coating, achieving both high-temperature stability and oil sludge adhesion prevention simultaneously.
2Duration of action of moving object
If oil ring operates for long time, then engine runs continuously, but oil sludge accumulates and clogs passages
Solution Approach 1:
The patent applies a preliminary protective action by coating the oil ring with a low surface free energy material before oil sludge can accumulate. This preventive coating maintains its effectiveness throughout continuous operation, preventing oil sludge adhesion and deposition from the outset rather than addressing accumulation after it occurs.
Solution Approach 2:
The patent uses a coating material that provides durable protection against oil sludge accumulation during extended engine operation. The coating acts as a sacrificial barrier that maintains its protective function throughout the service life of the oil ring, preventing clogging of oil passages even after prolonged exposure to high-temperature engine environments.
3Reliability
If coil expander presses oil ring body against cylinder wall, then sealing function is improved, but oil sludge between pitches reduces elasticity
Solution Approach 1:
The patent applies a thin film coating to the coil expander that provides oil sludge repellency without significantly altering the mechanical properties of the expander. The flexible coating maintains the elasticity of the coil expander while preventing oil sludge accumulation between the pitches, ensuring both sealing function and structural flexibility are preserved during continuous operation.
4Reliability
If oil drainage passages are clogged by oil sludge, then oil control function is hindered, but passage structure remains fixed
Solution Approach 1:
The patent extracts the oil sludge from the oil drainage passages by providing a coating surface that prevents oil sludge adhesion. The low surface free energy coating causes oil sludge to bead up and roll off rather than adhere to the passage walls, keeping the passages clear and maintaining oil control function without requiring complex movable or self-cleaning structures.
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 metal coating effectively suppresses oil sludge adhesion and deposition, maintaining the oil ring's functionality and preventing sticking of components, even during prolonged engine operation, by offering excellent heat resistance and low surface energy properties.
Implementation Method 1
a metal coating which has a surface with a surface free energy at 60° C. of 40 mJ/m2 or less and a hydrogen bonding strength at 60° C. of 1.0 mJ/m2 or less
Implementation Method 2
a metal coating which has a surface with a surface free energy at 60° C. of 40 mJ/m2 or less and a hydrogen bonding strength at 60° C. of 1.0 mJ/m2 or less
Implementation Method 3
The metal coating effectively suppresses oil sludge adhesion and deposition, maintaining the oil ring's functionality and preventing sticking of components, even during prolonged engine operation, by offering excellent heat resistance
Data Source
AI summary
An oil ring for an internal combustion engine is provided that can prevent adhesion and deposition of oil sludge even during long-time operation of the engine, can thereby prevent the occurrence of sticking of the oil ring components to each other, and can maintain a good oil control function. At least part of the surface of the oil ring for an internal combustion engine is coated with a metal coating having a surface free energy of 40 mJ/m2 or less and a hydrogen bonding strength of 1.0 mJ/m2 or less. A coating of Ni, Cu, or an alloy containing Ni or Cu is used as the metal coating.