Piston Remelt Depth Variation for Combustion Chamber Load Management
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Solution Overview
Problem
Internal combustion engine pistons face challenges in managing high thermal and mechanical loads, particularly in the combustion chamber cavity, where existing remelt treatments do not effectively distribute remelt depths to optimize loading capacity and reduce thermal aging.
Innovation Solution
A method that alters remelt depths in the circumferential direction of the piston, with deeper remelt zones in high-loaded regions and shallower in low-loaded areas, using parameters like current strength and rotational speed to reduce energy demand and remelt time, and is preferably applied to the combustion chamber cavity rim and bottom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If uniform remelt treatment is applied across the combustion chamber cavity, then structural refinement is achieved, but thermal aging increases and energy consumption rises
Solution Approach 1:
The patent applies remelt treatment with locally varying depths across the combustion chamber cavity, creating zones with different remelt depths in the circumferential direction. This local differentiation allows optimized structural refinement where needed while reducing heat input in less critical areas, thereby resolving the contradiction between strength improvement and energy conservation.
Solution Approach 2:
The combustion chamber cavity is divided into multiple zones with different remelt depths arranged in the circumferential direction. This segmentation enables selective application of remelt treatment intensity, applying deeper remelt to high-stress regions and shallower remelt to lower-stress regions, thus reducing overall thermal aging and energy consumption while maintaining necessary loading capacity.
2Strength
If deeper remelt treatment is applied to increase loading capacity, then thermal aging increases, but if shallower remelt is used, then loading capacity is insufficient
Solution Approach 1:
Different remelt depths are applied to different zones of the combustion chamber cavity based on local stress requirements. High-loaded regions receive deeper remelt treatment for enhanced loading capacity, while less loaded regions receive shallower treatment to minimize thermal aging, thus resolving the contradiction between strength and durability.
Solution Approach 2:
The remelt depth is dynamically varied in the circumferential direction, creating a gradient structure that adapts to the varying thermal and mechanical loads across the piston. This dynamic approach allows the structure to optimize both loading capacity and thermal aging resistance across different operational conditions.
3Strength
If remelt depth is increased in high-loaded regions, then loading capacity improves, but remelt time increases
Solution Approach 1:
The combustion chamber cavity is segmented into zones with different remelt depths, allowing the process to focus intensive treatment only where necessary for loading capacity while using shallower treatment in other areas, thus reducing overall remelt time without compromising structural integrity.
Solution Approach 2:
Instead of applying uniform deep remelt treatment across the entire combustion chamber cavity, the patent applies partial deep remelt only to specific high-loaded regions, achieving sufficient loading capacity with reduced total treatment time and energy input.
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 approach reduces thermal aging, decreases overall heat input, and lowers production costs by optimizing remelt treatment distribution, enhancing the piston's loading capacity and efficiency.
Implementation Method 1
subject regions of the combustion chamber cavity to a remelt treatment to refine the structure and increase resistance to thermal or mechanical changes
Implementation Method 2
the remelt treatment is preferably performed by a welding process
Data Source
AI summary
In a method for producing a piston (10) for an internal combustion engine, a melt treatment is performed at least in regions in particular in the region of a combustion chamber depression (14), the depth of said melt treatment being varied in the circumferential direction.