Piston Splitting Internal Cooling Runner for Combustion Chamber
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Solution Overview
Problem
The challenge is to provide an internal cooling runner for a piston that efficiently cools both the inner and outer peripheral sides while maintaining the strength of critical components, as a smaller combustion chamber requires a narrower cooling runner, leading to potential insufficient cooling.
Innovation Solution
A piston with a splitting internal cooling runner, where the cooling runner is divided into an outer and inner half cavity by a protruding splitting portion, allowing for uniform cooling and balanced flow distribution, with specific dimensions and angles optimizing the cooling effect and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the combustion chamber size is reduced to increase compression ratio, then fuel consumption and CO2 emissions are improved, but the internal cooling runner width becomes excessively narrow which deteriorates the strength of critical components
Solution Approach 1:
The internal cooling runner is divided into two separate channels: a first cooling channel and a second cooling channel. This segmentation allows each channel to be optimized independently - the first channel can be positioned closer to the combustion chamber for effective cooling while the second channel can be positioned farther away to maintain structural strength, thus resolving the contradiction between cooling effectiveness and component strength.
2Strength
If the internal cooling runner width is reduced to maintain small combustion chamber, then compression ratio is improved, but cooling effectiveness on outer peripheral side deteriorates
Solution Approach 1:
By segmenting the cooling runner into two separate channels, the invention enables the first channel to serve the inner peripheral cooling needs close to the combustion chamber while the second channel serves the outer peripheral cooling needs. This allows each channel to be optimally positioned for its specific cooling target, maintaining cooling effectiveness across the entire piston structure despite the overall narrow width constraint.
Solution Approach 2:
The invention applies different cooling strategies to different regions of the piston. The first cooling channel is configured with specific dimensions and positioning optimized for cooling the combustion chamber and inner peripheral areas, while the second cooling channel is configured for cooling the outer peripheral areas including the ring bank and throat. This local optimization ensures adequate cooling effectiveness throughout the piston structure.
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 splitting internal cooling runner ensures effective cooling of both the combustion chamber and annular groove, maintaining structural strength and improving heat dissipation efficiency, while being simple to fabricate and assemble.
Implementation Method 1
an annular internal cooling runner at least partially surrounding the combustion chamber being formed in the piston... The internal cooling runner ensures effective cooling of both the combustion chamber and annular groove
Implementation Method 2
the cooling runner is divided into an outer and inner half cavity by a protruding splitting portion, allowing for uniform cooling and balanced flow distribution
Data Source
AI summary
A piston may include a splitting internal cooling runner, an end portion recessed inward to form a combustion chamber, and an annular internal cooling runner at least partially surrounding the combustion chamber. A wall of the annular internal cooling runner may partially protrude in a direction away from the end portion to form an annular splitting portion which divides the annular internal cooling runner into an outer half cavity and an inner half cavity.