Piston Cooling Oil Passageway for Thermal Fatigue Reduction
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Solution Overview
Problem
Internal combustion engine pistons experience fatigue failure and frictional wear due to high-temperature combustion gases and pressures, leading to thermal deformation and damage, which existing cooling methods inadequately address.
Innovation Solution
A piston design featuring a cooling oil passageway with a main channel and branch channels extending from the piston crown's underside, providing enhanced cooling oil distribution and contact with remote areas, reducing thermal stress and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional cooling methods are used, then the piston structure remains simple, but the cooling effectiveness is insufficient and thermal deformation occurs
Solution Approach 1:
The cooling oil passageway is segmented into a main channel and multiple branch channels that extend at angles to different parts of the piston crown underside. This segmentation allows cooling oil to be distributed to multiple remote areas simultaneously, improving overall cooling effectiveness without requiring a completely complex passageway structure
Solution Approach 2:
Different regions of the piston crown underside are provided with different cooling configurations - the main channel serves one area while branch channels extend to other specific regions. This local quality approach ensures that each hot spot receives targeted cooling, improving thermal management while maintaining reasonable structural complexity
2Temperature
If cooling oil is injected to cool the piston, then cooling effectiveness improves, but oil distribution uniformity is insufficient
Solution Approach 1:
The cooling system is segmented into a main channel and multiple branch channels positioned at different locations and angles on the piston crown underside. This segmentation enables the cooling oil to be distributed more uniformly across different regions, addressing the oil distribution uniformity issue while maintaining effective cooling
Solution Approach 2:
The branch channels extend from the main channel at angles in different spatial dimensions, creating a three-dimensional cooling network on the piston crown underside. This dimensional approach allows cooling oil to reach remote areas that would be difficult to access with a single linear passageway, improving both cooling effectiveness and distribution uniformity
3Reliability
If the piston crown underside is cooled more effectively, then thermal fatigue resistance increases, but the passageway structure becomes more complex
Solution Approach 1:
The passageway is segmented into a main channel and branch channels, which can be manufactured as integrated features during piston production. This segmentation provides effective cooling to multiple areas without requiring separate components or excessively complex structures, balancing thermal fatigue resistance with manufacturing feasibility
Solution Approach 2:
The cooling passageway structure is merged with the piston crown design, with channels formed as integral features of the piston structure. This merging approach provides enhanced cooling coverage without adding separate complex components, maintaining reasonable device complexity while improving thermal fatigue resistance
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
The enhanced cooling oil distribution significantly increases the piston's resistance to thermal fatigue, prolongs operational life, and reduces maintenance costs by ensuring more uniform and effective cooling across the piston's underside.
Implementation Method 1
The cooling oil passageway may be defined by a recess of the underside of the piston crown
Implementation Method 2
a cooling oil guide or passageway positioned on and extending from a first part to a second part of the underside
Data Source
AI summary
A piston of an internal combustion engine is provided and includes a piston skirt enclosing at least a portion of an underside of a piston crown. A cooling oil passageway is provided on the underside of the piston and extends from a first part to a second part of the underside, where the first part is closer than the second part to a fluid flow from a cooling oil source. The cooling oil passageway may include a main channel and a branch channel extending from the main channel at an angle.