Rotary Engine Housings with Anti-Fretting Coatings
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Solution Overview
Problem
Rotary engines face challenges in operational longevity and performance due to high temperatures and pressures, which can lead to fretting and wear between components.
Innovation Solution
The application of anti-fretting coatings, such as chromium carbide, to selected interface surfaces of aluminum alloy components in a rotary internal combustion engine, including the main rotor housing, side housings, and transfer housings, to reduce wear and fretting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If aluminum alloy components are used in rotary engine housings, then weight is reduced and ease of manufacture is improved, but wear resistance and fretting prevention deteriorate
Solution Approach 1:
The patent applies a composite coating system consisting of a nickel-based binder coating combined with chromium carbide and silicon carbide particles. This composite structure provides both the lightweight advantage of aluminum alloy and the wear resistance of the ceramic-enhanced coating, resolving the contradiction between weight reduction and wear resistance.
Solution Approach 2:
The patent modifies the surface properties of the aluminum alloy housing by applying a thermal spray coating that changes the material composition and physical properties of the interface surfaces. This parameter change enhances fretting resistance and wear resistance while maintaining the underlying aluminum alloy structure.
2Ease of manufacture
If aluminum alloy components are used in rotary engine housings, then ease of manufacture is improved, but fretting resistance deteriorates
Solution Approach 1:
The patent applies the anti-fretting coating to the interface surfaces before final assembly and operation. This preliminary protective action ensures that the aluminum alloy components are pre-protected against fretting damage during manufacturing and assembly, eliminating the need for complex fretting prevention measures later.
Solution Approach 2:
The thermal spray coating creates a composite protective layer that combines the ease of manufacturing aluminum alloy with enhanced fretting resistance, allowing the component to be manufactured simply while achieving superior fretting protection.
3Power
If high temperature and pressure conditions are endured, then engine performance is maintained, but component durability and wear resistance deteriorate
Solution Approach 1:
The thermal spray coating changes the thermal and mechanical parameters of the interface surfaces, creating a protective barrier that allows the aluminum alloy housing to withstand high temperature and pressure conditions while maintaining component longevity and resisting wear.
Solution Approach 2:
The nickel-based binder with chromium carbide and silicon carbide particles creates a composite coating that provides thermal stability and wear resistance, enabling the engine to operate at high performance levels while protecting components from thermal and mechanical degradation.
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 use of anti-fretting coatings significantly increases the durability and long-term wear resistance of the rotary engine components, thereby enhancing the engine's operational longevity and performance.
Implementation Method 1
high temperatures and pressures, which can lead to fretting and wear between components
Implementation Method 2
fretting and wear between components
Data Source
AI summary
A rotary internal combustion engine includes a main rotor housing that has a peripheral wall that circumscribes a rotor cavity, a first interface surface and a second interface surface. A rotor is disposed within the rotor cavity. First and second side housings are secured against corresponding first and interface surfaces of the main rotor housing. The main rotor housing, the first side housing and the second side housing are formed from an aluminum alloy and at least one of the first interface surface and the second interface surface include an anti-fretting coating.