Hypocycloidal Engine Ring Gear Control for Variable Compression
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Solution Overview
Problem
Conventional internal combustion engines face inefficiencies due to the angular movement of the connecting rod, leading to friction losses and reduced force transfer, and struggle to adapt to different fuels requiring varying compression ratios, resulting in suboptimal thermodynamic and global efficiency.
Innovation Solution
A hypocycloidal internal combustion engine with a variable compression ratio and capacity, controlled by modifying the angular position of the ring gear in an epicyclic gear train, eliminating lateral movement of the connecting rod and allowing for continuous adjustment of compression ratio and engine displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional connecting rod mechanism is used to convert piston linear displacement to crankshaft circular movement, then the engine structure is simple and easy to manufacture, but lateral movement of the connecting rod causes friction losses and reduces force transfer efficiency
Solution Approach 1:
An epicyclic gear train is introduced as an intermediary mechanism between the piston and output shaft. The planet carrier connects to the output shaft while the ring gear rotates relative to the engine block, eliminating lateral connecting rod movement and reducing friction losses through controlled angular position adjustment
Solution Approach 2:
The ring gear is made dynamically adjustable in its angular position relative to the engine block, allowing continuous modification of the compression ratio and volumetric capacity. This dynamic adjustment enables the system to adapt to different operating conditions while maintaining efficient force transfer
2Adaptability or versatility
If the compression ratio is fixed for a specific fuel type, then the engine is optimized for that fuel, but it cannot adapt to different fuels requiring varying compression ratios
Solution Approach 1:
The compression ratio is made dynamically variable through controlled rotation of the ring gear relative to the engine block. This allows the engine to adapt its compression ratio to match different fuel requirements (gasoline, ethanol, diesel) while maintaining optimal thermodynamic efficiency for each fuel type
Solution Approach 2:
The engine is designed with multi-functionality to operate efficiently with different fuel types by adjusting the ring gear angular position. The same engine structure can be tuned for different compression ratios, making it universal across multiple fuel types without sacrificing thermodynamic efficiency
3Force
If the connecting rod undergoes angular movement during the engine cycle, then the crankshaft conversion is achieved, but force is decomposed perpendicular to crankshaft rotation reducing effective force transfer
Solution Approach 1:
The epicyclic gear train acts as an intermediary that converts piston linear displacement to output shaft rotation without requiring angular movement of the connecting rod. The planet carrier directly transmits force to the output shaft, eliminating force decomposition and maximizing effective force transfer
Data Source
AI summary
A hypocycloidal internal combustion engine containing at least one alternative displacement piston connected through a connecting rod to a crankshaft, which is connected to an epicyclic gear train. In this gear train, the planet gear carrier is connected to the output shaft, and the ring gear can be rotated (in a controlled manner) in relation to the engine block. The present invention allows the control of the compression ratio and engine displacement of the engine by adjusting the angular position of the ring gear, which can be done continuously and instantaneously, even with the engine in operation.