Piston Skirt Solid Lubricator for Adhesion Prevention
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Solution Overview
Problem
Internal combustion engine pistons face challenges in preventing adherence between the piston skirt and cylinder inner wall surfaces, leading to increased frictional loss and wear, especially in severe environments like racing cars, where existing lubrication methods are not durable enough.
Innovation Solution
A piston design incorporating a solid lubricator on the piston skirt with a combination of silver, silver alloy, copper, or copper alloy, along with carbon materials and carbide ceramics, which provides enhanced thermal conductivity and wear resistance, and is strategically applied in a reduced form (line or dot) to minimize cost and weight, with an intermediate resin layer for bonding and additional lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lubricating film made of silver, silver alloy, copper, or copper alloy is deposited on the piston skirt to reduce sliding resistance, then the lubrication properties are improved, but the film becomes susceptible to wear and adhesion in severe environments
Solution Approach 1:
The patent applies composite materials by combining silver, silver alloy, copper, or copper alloy with carbon materials (graphite, carbon nanotubes, diamond) and/or carbide ceramics (silicon carbide, titanium carbide, titanium carbonitride) to create a solid lubricator. This composite structure integrates the excellent thermal conductivity and adhesion prevention of metals with the high wear resistance and lubricating capability of carbon materials and carbide ceramics, resolving the contradiction between initial lubrication effectiveness and long-term durability in severe environments.
Solution Approach 2:
The patent changes the material parameters by incorporating materials with vastly different thermal conductivity characteristics. Carbon materials have much higher thermal conductivity than the metal matrix, enabling efficient heat diffusion from sliding contact regions. This parameter change prevents heat accumulation that would otherwise lead to adhesion, thereby extending the duration of action and reliability of the lubricating film.
2Loss of energy
If carbon materials are added to the metal to enhance thermal conductivity and reduce frictional loss, then heat diffusion is improved, but the complexity of material composition increases
Solution Approach 1:
The patent resolves the complexity issue by creating a composite material system where carbon materials and/or carbide ceramics are integrated into the metal matrix. This single composite component simultaneously achieves multiple functions: the metal phase provides thermal conductivity and adhesion prevention, while the carbon and carbide phases provide high-temperature stability, wear resistance, and enhanced heat diffusion. The composite structure reduces frictional loss without requiring separate cooling systems or complex multi-component assemblies.
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 frictional loss and prevents adherence between the piston and cylinder, ensuring durability and fuel efficiency even in severe conditions, while minimizing the cost and weight of the piston.
Implementation Method 1
the solid lubricator contains at least one of silver, silver alloy, copper, and copper alloy, and at least one of a carbon material and carbide ceramics... heat, which is generated by sliding contact between regions of the sliding surface of the piston skirt and the inner wall surface of the cylinder, diffuses easily
Implementation Method 2
resistance to sliding movement between the inner wall surfaces of cylinders (inner wall surfaces of bores or sleeves) of the internal combustion engine and the pistons that move back and forth in the cylinders... the solid lubricator exhibits excellent intrinsic thermal conductivity, and is not likely to become adhered to the inner wall surface of the cylinder
Implementation Method 3
it is preferable to interpose an intermediate layer made of a heat-resistant resin material between the film and the piston skirt, so that the film becomes firmly bonded to the piston skirt by the intermediate layer
Data Source
AI summary
A piston that moves reciprocally in the cylinder of an internal combustion engine and has a piston skirt that makes sliding contact with the inner wall of the cylinder. Solid lubrication parts are provided on the sliding-contact surface of the piston skirt. The solid lubrication parts include at least one type of silver, silver alloy, copper, or copper alloy, and at least one type of carbon material or carbide ceramics.