Piston Groove and Cylinder Liner Cooling Configuration
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Solution Overview
Problem
Internal combustion engines face challenges in achieving improved engine reliability, longer life, reduced emissions, and enhanced efficiency due to complex mechanisms and limitations in current piston and cylinder liner configurations, particularly in cooling and fuel combustion efficiency.
Innovation Solution
The configuration includes a cylinder bore with coolant passages radially outward, a piston with a groove positioned close to its top surface, and a cylinder liner with specific dimensions and features that optimize cooling and prevent fuel dead zones, allowing for improved heat dissipation and reduced emissions by positioning the piston rings closer to the combustion chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the piston groove is positioned closer to the top surface (smaller B/D ratio), then cooling efficiency and fuel combustion efficiency are improved, but the risk of fuel dead zones and unburned fuel increases
Solution Approach 1:
The patent optimizes the B/D ratio parameter to a specific range (0.060-0.090) to balance cooling efficiency and combustion completeness. This parameter change allows the groove to be positioned close enough to the top surface for effective cooling while maintaining sufficient distance to prevent fuel dead zones and ensure complete combustion.
2Temperature
If coolant passages are positioned radially outward from the cylinder bore, then piston cooling is enhanced, but the complexity of the engine structure increases
Solution Approach 1:
The coolant passages are designed to serve multiple functions: they cool the piston through radial positioning, cool the cylinder liner through strategic placement, and remove heat from combustion gases. This multi-functionality reduces the need for separate cooling systems, thereby managing structural complexity while achieving comprehensive cooling.
Solution Approach 2:
The coolant passages are nested within the existing engine structure, utilizing the space radially outward from the cylinder bore. This nesting approach integrates the cooling system into the existing engine architecture without requiring additional external components, thus enhancing cooling while minimizing increases in structural complexity.
3Loss of energy
If piston rings are positioned closer to the combustion chamber, then heat dissipation is improved, but the likelihood of fuel accumulation and incomplete combustion increases
Solution Approach 1:
The patent specifies an optimized B/D ratio range (0.060-0.090) that positions the piston rings at an ideal distance from the top surface. This parameter optimization ensures that the rings are close enough to the combustion chamber for effective heat dissipation while maintaining sufficient clearance to prevent fuel accumulation and ensure complete combustion, thereby balancing energy loss reduction with productivity maintenance.
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 configuration enhances piston and cylinder liner cooling, reduces emissions, and improves engine efficiency by minimizing unburned fuel and heat buildup, leading to increased longevity and reliability of engine components.
Implementation Method 1
at least one coolant passage located radially outward from the cylinder bore
Implementation Method 2
coolant passage located radially outward from the cylinder bore
Data Source
AI summary
A cylinder liner and piston configuration for an internal combustion engine includes features for improving the cooling of the piston. Specific ratios and dimensions are included to optimize the features of the cylinder liner and piston. Also included are unique piston features that assist in achieving some of the specified dimensions and ratios.