Spherical Two-Stroke Engine Chamber Design
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Solution Overview
Problem
Conventional internal combustion heat engines suffer from high thermal losses and pressure forces due to the cylindrical piston-cylinder arrangement, limiting efficiency and increasing the weight of the engine. Additionally, the Miller-Atkinson cycle cannot be implemented in standard 2-stroke engines due to fixed intake and exhaust apertures, restricting efficiency improvements.
Innovation Solution
The engine features a quasi-spherical combustion chamber at Top Dead Center, reducing thermal losses and pressure forces, and implements a staged distribution for the Miller-Atkinson cycle through adjustable intake and exhaust apertures, allowing for an optimized asymmetrical distribution diagram. This design includes four moving connections with guided pistons, minimizing friction and using laser ignition for efficient combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a standard cylindrical piston-cylinder arrangement is used, then the engine structure is simple and easy to manufacture, but thermal losses are high due to increased surface-to-volume ratio
Solution Approach 1:
The patent applies spheroidality by designing the combustion chamber with a spherical geometry formed by the intersection of piston faces. This spherical shape minimizes the surface-to-volume ratio, reducing thermal losses to the chamber walls while maintaining compact dimensions. The curved spherical surfaces replace the traditional cylindrical geometry, directly addressing the thermal efficiency problem.
2Weight of moving object
If a standard cylindrical piston-cylinder arrangement is used, then the engine structure is simple, but pressure forces are high increasing the weight of moving assembly
Solution Approach 1:
The spherical combustion chamber geometry distributes the combustion pressure forces uniformly across the curved piston surfaces, reducing the peak projected area forces compared to a cylindrical arrangement. This force distribution reduces the inertial loads on the moving assembly, allowing for lighter construction while maintaining structural integrity under pressure.
Solution Approach 2:
The patent employs asymmetric piston face configurations where pistons have different shaped faces that intersect to form the spherical chamber. This asymmetry in piston design allows for optimized force distribution and reduced projected area, thereby reducing the pressure forces acting on the moving assembly components.
3Loss of energy
If fixed intake and exhaust apertures are used in a 2-stroke engine, then the distribution system is simple, but the Miller-Atkinson cycle cannot be implemented limiting efficiency
Solution Approach 1:
The patent implements dynamic aperture control where the intake and exhaust openings are not fixed but vary during the engine cycle. The apertures are positioned and sized to enable delayed intake closure and advance exhaust opening, creating the asymmetric distribution diagram required for the Miller-Atkinson cycle. This dynamic adjustment of effective aperture timing allows efficiency improvements while maintaining a relatively simple two-stroke architecture.
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 engine achieves reduced thermal losses and pressure forces, increased efficiency, and the ability to implement the Miller-Atkinson cycle, resulting in improved performance and reduced engine weight, while also enabling higher rotation speeds and adaptable speed ranges without additional reducers.
Implementation Method 1
Thermal losses from the walls of the combustion chamber and cylinder, for a standard internal combustion heat engine, represent around one-third of the calorific value of the fuel
Implementation Method 2
This decreases the sum total of forces engendered by pressure on the chamber walls, as compared to the pressure force on a standard cylinder head plus that of a standard piston
Implementation Method 3
Laser lighting makes it possible to ignite in the center of the sphere, by focusing of laser rays
Implementation Method 4
ignition by compression, enables rotation at a higher rate than the standard engine, while at the same time leaving fuel to be injected, vaporized and burned
Data Source
AI summary
An internal combustion heat engine, of which the architecture of one elementary “cylinder” includes 4 identical mobile couplings distributed about the Z axis of the engine, consisting of a segmented “piston” driven by the crank pin of a crankshaft and guided by a roller rolling in a slide. The crankshafts, which are parallel and synchronized by a gear mechanism, perform one revolution per cycle. Each piston includes a sliding surface that nearly touches the cylinder face of the adjacent piston, but on which the segmentation slides in sealed contact. The concave shape of the 4 overlapping faces encloses a chamber volume that changes cyclically: at a minimum, having a quasi-spherical shape during combustion, reducing the heat losses at the walls, and at a maximum, uncovering the ports allowing intake and exhaust via transfer units and manifolds with the possibility of more economical Miller/Atkinson distribution, via rotary plates.