Internal Combustion Engine Piston Cooling Channel Design
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Solution Overview
Problem
Internal combustion engine pistons face challenges in efficiently cooling critical areas such as the combustion bowl rim and uppermost ring groove due to increasing power outputs and resulting higher temperatures, which affect lifespan and strength.
Innovation Solution
A piston design featuring a cooling channel that is primarily at a higher level closer to the piston head, with enlarged cross-sections at inflow and outflow areas positioned lower, allowing for efficient cooling of critical regions while maintaining sufficient material thickness and strength by being slightly lowered between the uppermost ring groove and combustion bowl.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cooling channel is positioned at a lower level to ensure sufficient material thickness and strength at inflow/outflow, then strength and material thickness are improved, but the cooling efficiency at critical areas (combustion bowl rim and uppermost ring groove) deteriorates
Solution Approach 1:
The cooling channel is positioned at different vertical levels at different locations: at the inflow and outflow areas it is lowered to ensure sufficient material thickness and strength, while in the critical cooling areas (combustion bowl rim and uppermost ring groove regions) it is positioned at a higher level closer to these areas. This local variation in channel positioning optimizes both structural strength and cooling efficiency at each specific location.
2Temperature
If the cooling channel is positioned at a higher level closer to critical areas, then cooling efficiency is improved, but material thickness and strength at inflow/outflow areas deteriorate
Solution Approach 1:
The cooling channel is positioned at different vertical levels at different locations: at the inflow and outflow areas it is lowered to ensure sufficient material thickness and strength, while in the critical cooling areas (combustion bowl rim and uppermost ring groove regions) it is positioned at a higher level closer to these areas. This local variation in channel positioning optimizes both structural strength and cooling efficiency at each specific location.
3Ease of operation
If the cooling channel cross-section is enlarged at inflow and outflow, then flow efficiency is improved, but the available space and structural integrity deteriorate
Solution Approach 1:
The cooling channel cross-section is selectively enlarged only at the inflow and outflow areas where flow efficiency is critical, while maintaining a smaller cross-section in the intermediate sections where structural integrity is more important. This localized cross-section variation optimizes flow efficiency at entry/exit points without compromising the structural strength of the piston body.
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 ensures effective cooling of critical areas over the entire circumference, maintaining strength and material thickness, and allows for efficient lubrication between the piston rod and pin, enhancing the piston's durability and performance.
Implementation Method 1
provision must be made for sufficient cooling of the piston... the cooling channel can be configured over the majority of its progression particularly close to the critical locations such as, for example, the bowl rim and the uppermost ring groove of the piston
Data Source
AI summary
A piston for an internal combustion engine comprises at least one cooling channel located only in the areas of at least one inflow and at least one outflow at a low level comparatively removed from the base of the piston and at a constant higher level closer to the piston base, said cooling channel comprising steep inclines between the areas located at the low and at the high level.