Segmented Piston Bowl Structure for Early Fuel Dispersion
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Solution Overview
Problem
Existing pistons for internal combustion engines do not effectively facilitate early interaction between fuel and the piston bowl surface, leading to inefficient combustion.
Innovation Solution
The piston design features circumferentially spaced apart dividing and colliding protrusions on the piston bowl surface, allowing for early interaction and efficient dispersion of fuel, with a specific ratio of piston bowl radius to crown radius optimizing fuel mixing and combustion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional smooth piston bowl surface is used, then the piston structure is simple, but fuel dispersion and mixing efficiency are insufficient
Solution Approach 1:
The piston bowl surface is segmented into multiple functional zones using protrusions and recesses. The dividing protrusions create separate fuel reception zones, while colliding protrusions create mixing zones. This segmentation allows fuel to be received, dispersed, and mixed in distinct areas, significantly improving combustion efficiency compared to a smooth surface.
Solution Approach 2:
Different regions of the piston bowl surface are given different geometries to perform different functions. The dividing protrusions have specific heights and spacing optimized for fuel reception, while colliding protrusions are positioned and sized for optimal fuel mixing. This local differentiation of surface quality maximizes combustion efficiency in each zone.
2Productivity
If the piston bowl radius is large, then the combustion chamber volume is increased, but the interaction distance between fuel and piston bowl surface becomes too long
Solution Approach 1:
By segmenting the piston bowl surface with dividing protrusions, the fuel is split into multiple streams that travel shorter distances across the surface. Instead of fuel traveling across the entire bowl diameter, it is divided into smaller segments that cover shorter paths, reducing the overall interaction distance while maintaining effective mixing.
Solution Approach 2:
The protrusions and recesses add a radial dimension to the fuel-piston interaction, creating three-dimensional flow patterns. Fuel is not only mixed in the axial direction but also dispersed radially by the protrusions, effectively reducing the linear distance fuel must travel while increasing the surface area of interaction.
3Productivity
If circumferentially spaced protrusions are added to the piston bowl surface, then fuel dispersion is improved, but the piston manufacturing complexity increases
Solution Approach 1:
The protrusions are designed as discrete, circumferentially spaced elements rather than continuous complex surfaces. This segmentation allows for standardized manufacturing processes where identical protrusion elements can be created and positioned at regular intervals, simplifying the fabrication process compared to creating entirely unique surface geometries.
Solution Approach 2:
The design specifies particular parameter ranges for the protrusions (height, spacing, circumferential position) that can be adjusted to optimize performance while remaining within manufacturable limits. By defining specific parameter ranges rather than requiring exact unique geometries, the design balances performance optimization with manufacturing feasibility.
Data Source
AI summary
The present disclosure relates to a piston for an internal combustion engine comprising a cylinder. The piston is adapted to move reciprocally in the cylinder of the internal combustion engine along a reciprocal axis, whereby a combustion chamber is at least partially delimited by the cylinder and the piston. The piston comprises a piston crown adapted to face the combustion chamber, the piston crown comprising a piston bowl surface, recessed in the piston and circumferentially extending around a piston bowl center axis adapted to extend in a direction parallel to the reciprocal axis. The piston also extends in a radial direction (R) being perpendicular to the extension of the piston bowl center axis. The piston bowl surface defining a piston bowl that, following the circumference of the piston bowl surface around the piston bowl center axis in a plane perpendicular to the piston bowl center axis, comprises a set of circumferentially spaced apart dividing protrusions and a set of circumferentially spaced apart colliding protrusions.