Hydraulic Piston Engine for Compression Ratio and Pressure Control
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Solution Overview
Problem
The complexity of engine structure increases when mechanisms for changing the compression ratio and suppressing maximum combustion pressure are combined, affecting both marine and non-marine engines.
Innovation Solution
An engine design that incorporates a hydraulic chamber and a compression ratio changing mechanism, where the hydraulic chamber also functions to suppress combustion pressure by using a partition piston and elastic member to balance hydraulic and elastic forces, thereby reducing structural complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both compression ratio changing mechanism and combustion pressure suppression mechanism are provided, then the engine can change compression ratio and suppress maximum combustion pressure, but the structure becomes complicated
Solution Approach 1:
The patent combines the compression ratio changing mechanism and the combustion pressure suppression mechanism into a single integrated system. The hydraulic chamber serves dual purposes: it acts as the compression ratio changing mechanism through the sliding portion that moves the piston, and simultaneously functions as the combustion pressure suppression mechanism through the crown surface that pushes down under high pressure. This merging of functions into one unified structure resolves the technical contradiction by achieving both capabilities without requiring separate mechanisms, thus avoiding structural complexity.
Solution Approach 2:
The hydraulic chamber is designed with multi-functionality, serving both as the compression ratio changing mechanism and the combustion pressure suppression mechanism. The sliding portion within the hydraulic chamber enables compression ratio adjustment, while the crown surface of the piston responds to combustion pressure to suppress maximum pressure peaks. This universal design allows a single component to perform multiple functions, thereby resolving the contradiction between adaptability and device complexity.
2Stress or pressure
If hydraulic chamber is formed inside piston for pressure suppression, then maximum combustion pressure increase is suppressed, but the structure becomes more complex
Solution Approach 1:
The patent merges the pressure suppression function with the existing hydraulic chamber structure used for compression ratio adjustment. The crown surface of the piston is integrated into the hydraulic chamber system, allowing it to respond to combustion pressure and push down when needed. This integration means the pressure suppression mechanism does not require separate components but utilizes the existing hydraulic chamber infrastructure, thereby suppressing maximum combustion pressure without significantly increasing structural complexity.
3Adaptability or versatility
If sliding portion is arranged in crosshead for compression ratio change, then geometrical compression ratio can be changed, but the structure becomes more complex
Solution Approach 1:
The patent combines the compression ratio changing function with the combustion pressure suppression function within the same hydraulic chamber structure. The sliding portion that adjusts compression ratio is integrated into the hydraulic chamber, and the crown surface of the piston serves as part of this same system for pressure suppression. This merging eliminates the need for separate mechanisms, achieving compression ratio adjustability without proportionally increasing structural complexity.
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 effectively suppresses the increase in combustion pressure and NOx emissions while maintaining a simpler engine structure by sharing the hydraulic chamber for both functions, reducing the need for separate components and minimizing structural complexity.
Implementation Method 1
actuation of the sliding portion by hydraulic pressure causes a top dead center position of the piston to move
Implementation Method 2
When the pressure in a combustion chamber increases, working oil is discharged from the hydraulic chamber, thereby pushing down a crown surface of the piston
Implementation Method 3
a partition piston and an elastic member to balance hydraulic and elastic forces
Data Source
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AI summary
Provided is an engine, including: a cylinder; a piston accommodated in the cylinder; a combustion chamber facing the piston; a sliding portion (large-diameter portion (114a)) configured to perform a stroke motion together with the piston; a hydraulic surface of the sliding portion facing a side opposite to the combustion chamber; a hydraulic chamber (154a), which the hydraulic surface faces; and an auxiliary hydraulic chamber (158b), which communicates with the hydraulic chamber (154a), and has a volume changeable in accordance with a hydraulic pressure in the hydraulic chamber (154a).