Piston Cooling Gallery With Metal-Particle Composition
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Solution Overview
Problem
Pistons in internal combustion engines face challenges in maintaining effective heat dissipation and preventing degradation of cooling oil due to high temperatures, leading to frequent oil changes and potential engine damage from carbon deposits and oxidation.
Innovation Solution
A metal-containing composition with a base material having a melting temperature less than 181°C and dispersed metal particles is used in the sealed cooling gallery of the piston, providing enhanced thermal conductivity and preventing degradation, allowing for efficient heat transfer and reduced carbon deposits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling oil is sprayed into the cooling gallery to moderate piston temperatures, then heat dissipation is improved, but the cooling oil degrades over time due to high temperatures requiring frequent changes
Solution Approach 1:
The invention changes the physical state parameter of the cooling medium by using a phase-change material that transitions from solid to liquid at operating temperatures. This allows the material to absorb heat during phase transition while remaining stable at high temperatures, eliminating degradation issues associated with conventional liquid cooling oils.
Solution Approach 2:
The invention uses a composite cooling composition consisting of a phase-change material base combined with thermally conductive metal particles. This composite structure provides both the phase-change cooling mechanism and enhanced thermal conductivity to improve heat dissipation from the piston crown while maintaining oil stability.
2Temperature
If high flow of cooling oil is maintained constantly to control piston temperature, then heat dissipation is improved, but the system complexity and continuous maintenance requirements increase
Solution Approach 1:
The phase-change material provides self-regulating cooling by automatically absorbing heat when the piston temperature rises and freezing when temperature drops. This passive thermal management eliminates the need for active pumping systems and continuous oil circulation, significantly reducing system complexity.
Solution Approach 2:
The cooling composition maintains continuous heat absorption capability through repeated phase transitions, providing uninterrupted thermal management without requiring continuous external energy input or system intervention.
3Loss of energy
If conventional cooling oil is used in the cooling gallery, then heat transfer occurs, but oxidation and erosion occur leading to reduced engine life
Solution Approach 1:
The phase-change material creates an inert thermal environment within the cooling gallery, replacing reactive cooling oils that cause oxidation. The material's chemical stability at high temperatures prevents oxidative degradation and erosion of engine components while maintaining effective heat transfer.
Solution Approach 2:
The invention uses a stable, non-degradable cooling composition that eliminates the need for periodic oil changes. While the initial material may be simpler in composition, its indefinite service life without degradation provides long-term economic benefits by eliminating maintenance costs and extending engine life.
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 solution ensures continuous heat dissipation without degrading, reduces oxidation and erosion, extends engine service intervals, and maintains lubricant oil quality, while also allowing for controlled temperature distribution and reduced carbon buildup.
Implementation Method 1
a plurality of metal particles having a thermal conductivity greater than the thermal conductivity of the base material... the metal-containing composition functions as a coolant... the higher heat transfer rate obtained from the metal-containing composition
Implementation Method 2
a base material having a melting temperature less than 181° C... During high temperature operation, the metal-containing composition flows throughout the sealed cooling gallery. In this case, the base material is in liquid form
Data Source
Figure 1
AI summary
A piston for an internal combustion engine comprises a sealed cooling gallery extending circumferentially around a center axis beneath a bowl rim of an upper crown. A metal-containing composition having a high thermal conductivity fills a portion of the sealed cooling gallery to dissipate heat. The metal-containing composition includes a base material having a melting temperature less than 181° C and a plurality of metal particles having a thermal conductivity greater than the thermal conductivity of the base material. For example, the metal-containing composition can comprise copper particles dispersed in silicone oil, or copper particles dispersed in a mixture of alkali metals. During high temperature operation, as the piston reciprocates in the cylinder bore, the base material is liquid and flows throughout the cooling gallery to dissipate heat away from the upper and lower crowns.