Tilting Piston Combustion Chamber Quench Area Reduction
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Solution Overview
Problem
In existing engine combustion chamber structures, a quench area forms near the top dead center, leading to flame cooling and the generation of unburned substances in exhaust gases due to incomplete combustion.
Innovation Solution
The engine design features a cylinder block, piston, and cylinder head configuration where the inner peripheral surface of the cylinder head is flush with the cylinder and the piston has a tilting portion, reducing the quench area and facilitating flame spread by increasing the distance between the piston and cylinder head, and incorporating an arc-shaped recessed portion in the cylinder head to enhance flame propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the combustion chamber is formed with a conventional cylinder head structure, then the manufacturing is simpler, but a quench area forms between the cylinder head and piston causing flame cooling and unburned substance generation
Solution Approach 1:
The invention introduces a tilting portion on the piston that creates a three-dimensional flame propagation path, allowing the flame to tilt and spread along the inner peripheral surface of the cylinder head, thereby eliminating the quench area without complicating the cylinder head structure
Solution Approach 2:
The invention changes the geometric parameters of the combustion chamber by forming a tilting portion on the piston, which alters the flame propagation trajectory and increases the effective combustion chamber volume, thereby reducing the quench area and improving combustion completeness
2Temperature
If the distance between piston and cylinder head is increased to reduce quench area, then flame cooling is suppressed, but the combustion chamber volume increases
Solution Approach 1:
The invention uses a curved tilting portion on the piston that smoothly transitions from the upper surface to the side surface, creating an optimized flame propagation path that maintains high flame temperature while minimizing the additional volume required
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 reduces the quench area, suppresses flame temperature lowering, and decreases unburned hydrocarbons in exhaust gases, ensuring more complete combustion and reduced emissions.
Implementation Method 1
upon ignition of the ignition plug, the flame is cooled in the gap portion
Implementation Method 2
the flame is cooled in the gap portion. For this reason, the temperature of the flame is lowered by the quenching action
Data Source
AI summary
An engine includes a cylinder block in which a cylinder is formed, a piston arranged to be reciprocally movable in the cylinder, a cylinder head that is arranged on an upper side of the cylinder block and forms a combustion chamber between an inner peripheral surface of the cylinder and an upper surface of the piston, and an ignition plug arranged in the cylinder head. An inner peripheral portion of the cylinder head includes an inner peripheral side portion formed to be flush with the inner peripheral surface of the cylinder, and a tilting portion tilting from the upper surface of the piston to a side surface is formed on the piston.