Piston Rod Gas Passage Layout for Free Piston Engine Scavenging
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Solution Overview
Problem
Internal combustion engines with multiple parts and auxiliary systems are complex and inefficient, particularly in managing gas communication between combustion chambers, leading to suboptimal performance and increased complexity.
Innovation Solution
A linear reciprocating engine design with a piston rod having passageways that allow gas communication between combustion chambers, enabling separate gas supply to each chamber through strategically positioned openings that move in and out of the cylinder, facilitating efficient gas flow and reduced system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional internal combustion engines use multiple parts and auxiliary systems for proper functioning, then the engine can perform required functions, but the device complexity increases and efficiency decreases
Solution Approach 1:
The patent combines multiple functions into the piston rod structure. The piston rod integrates gas supply passages, exhaust gas scavenging pathways, and structural support functions into a single component, eliminating the need for separate auxiliary systems while maintaining engine functionality
Solution Approach 2:
The piston rod serves multiple purposes: it provides structural support for the piston, acts as a gas supply conduit through internal passages, and enables exhaust gas scavenging through strategically positioned openings. This multi-functionality reduces the overall system complexity
2Reliability
If gas communication between combustion chambers is managed through traditional systems, then proper combustion can be maintained, but the system requires extensive auxiliary components reducing efficiency
Solution Approach 1:
The patent extracts the gas management function from separate auxiliary systems and integrates it directly into the piston rod. The gas supply passages and scavenging openings are built into the piston rod itself, eliminating intermediate components and improving efficiency
Solution Approach 2:
The piston rod structure itself provides the gas supply and scavenging functions through its integrated passages and openings, rather than requiring external auxiliary systems. The moving openings automatically control gas flow based on piston position
3Productivity
If openings in the piston rod are positioned to selectively communicate gas to combustion chambers, then gas flow efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The piston rod openings are designed to move relative to the combustion chambers during piston operation. This dynamic positioning allows the openings to automatically align with the chambers at appropriate times in the cycle, achieving efficient gas flow control through motion rather than requiring extremely precise static positioning
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
This design enhances engine efficiency by allowing continuous gas supply and scavenging of exhaust gases, improving performance and reducing the need for extensive auxiliary systems, while maintaining a compact and simplified structure.
Implementation Method 1
a piston rod having a passageway extending through the piston into both combustion chambers
Implementation Method 2
at least one first opening in a first side of the piston rod configured to move into and out of the first combustion chamber to selectively communicate gas to the first combustion chamber
Data Source
AI summary
An internal combustion engine may include an engine block, a cylinder defining at least one combustion chamber, and a piston in the cylinder. The piston may travel in a first stroke from one end to an opposite end of the cylinder, and may be sized relative to the cylinder to enable an expansion stroke portion of the first stroke while the piston travels under gas expansion pressure, and a momentum stroke portion of the first stroke for the remainder of the first stroke following the expansion stroke portion. A passageway may be formed in the piston rod to communicate gas flow between a first combustion chamber and an area external to the cylinder when the piston is in a first position, and to communicate gas flow between a second combustion chamber and an area external to the cylinder when the piston is in a second position.