Dual-Crankshaft Ceramic Piston Engine for Thermal Efficiency
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Solution Overview
Problem
Current engines suffer from low thermal efficiency due to metal components' poor thermal insulation, and while ceramic materials offer better insulation, their brittleness and complex processing methods pose reliability and manufacturing challenges.
Innovation Solution
A dual-crankshaft engine design featuring ceramic components with a double-crank mechanism, variable compression ratio, and wear-resistant layers to reduce abrasion and improve thermal efficiency, combined with a detachable connection structure for enhanced reliability and manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If ceramic material is used for cylinder liners and pistons, then thermal efficiency is improved, but reliability deteriorates due to brittleness
Solution Approach 1:
The patent uses ceramic materials for cylinder liners and pistons to improve thermal efficiency while addressing reliability concerns through composite material design and protective mechanisms
Solution Approach 2:
The patent implements protective measures beforehand to cushion against the brittleness of ceramic materials, including optimized structural design and controlled loading conditions to prevent sudden failures
2Temperature
If ceramic material is used for engine components, then thermal insulation performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the engine components into modular units with ceramic liners and pistons that can be manufactured separately and assembled, reducing overall manufacturing complexity
Solution Approach 2:
The patent optimizes ceramic material parameters and processing conditions to achieve desired thermal insulation properties while simplifying the manufacturing process through parameter optimization
3Loss of energy
If variable compression ratio is increased for medium and small load conditions, then thermal efficiency is improved, but knocking occurs under full load condition
Solution Approach 1:
The patent implements a variable compression ratio mechanism that dynamically adjusts the compression ratio based on operating conditions, using high compression ratios for medium and small loads to improve thermal efficiency while reducing to low compression ratios for full load to prevent knocking
Solution Approach 2:
The patent changes the compression ratio parameter according to load conditions, optimizing engine performance across different operating ranges by adjusting this critical parameter
4Stability of the object's composition
If double-crank mechanism is used, then inertia forces are balanced, but friction and wear increase at connection surfaces
Solution Approach 1:
The patent introduces wear-resistant layers as intermediary protective coatings on connection surfaces of the double-crank mechanism, reducing direct friction and wear between metal surfaces while maintaining the inertia force balancing benefits
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 dual-crankshaft engine design effectively reduces piston and cylinder liner wear, increases ceramic material reliability, and enhances thermal efficiency by transferring force to a low-temperature, easy-to-lubricate area, balancing inertia forces, and allowing for higher compression ratios without knocking, thereby improving fuel efficiency and reducing noise and vibration.
Implementation Method 1
An upper edge and a lower edge of the connection rod main body which contacts the slot are respectively provided with a wear-resistant layer
Implementation Method 2
Ceramic material is a material with good thermal insulation performance. The components directly contacting high-temperature gas, such as cylinder liners, pistons, etc., are made of ceramic material
Data Source
AI summary
A dual-crankshaft engine includes a piston and two crankshafts constituting a double-crank mechanism, and further includes a cylindrical block. The cylindrical block includes a cylinder portion and a crankshaft support portion. A lower end of the piston is a piston guiding rod. A piston rod guiding groove is provided in the cylindrical block. A lower end of the piston is opened, and provided with a piston end cover. The piston end cover and the piston guiding rod are detachably and fixedly connected. The piston is a non-skirted piston where the piston sealing end is separated from the piston guiding end. The piston sealing end is the piston head of the piston. The piston guiding end is the piston guiding rod and the piston rod guiding groove. The piston is designed to be equi-stress, which increases the strength.