Internal Combustion Engine Water Jacket Cooling
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Solution Overview
Problem
Existing internal combustion engines face challenges in smoothly flowing coolant through the passage between exhaust ports, leading to inadequate cooling of the cylinder head area, particularly between exhaust ports.
Innovation Solution
The internal combustion engine design features a water jacket with an inclined plug hole and strategically positioned passages to create a sufficient inter-port passage area, allowing coolant to flow smoothly and effectively cool the cylinder head between exhaust ports, while maintaining a compact engine size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the axial line of the plug hole coincides with the cylinder axial line, then the structure is simple, but the area between the plug hole and exhaust ports is small, limiting passage size
Solution Approach 1:
The plug hole axial line is inclined relative to the cylinder axial line, creating an asymmetric arrangement that enlarges the area between the plug hole and exhaust ports, allowing for a larger coolant passage cross-section
2Temperature
If the passage between exhaust ports is enlarged, then cooling effectiveness is improved, but coolant flow smoothness deteriorates
Solution Approach 1:
The passage cross-sectional shape is optimized with a height greater than width, creating a specific local geometric quality that reduces flow resistance and improves coolant flow smoothness while maintaining adequate passage area for effective cooling
3Temperature
If the passage cross-section is increased, then cooling performance is improved, but engine size increases
Solution Approach 1:
The passage cross-sectional dimensions are optimized with height greater than width, utilizing vertical space more effectively to increase cooling capacity without proportionally increasing the horizontal footprint and overall engine size
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 design ensures efficient coolant flow and effective cooling of the cylinder head between exhaust ports, suppressing temperature increases and allowing for a reduced engine size without compromising cooling efficiency.
Implementation Method 1
A coolant flows through the water jacket
Implementation Method 2
effectively cooling a portion of the cylinder head between exhaust ports, suppressing temperature increases
Data Source
Figure 1
Figure 2
Figure 3
AI summary
As viewed along a cylinder axial line CA so that a center 51C of a first intake opening 51A is located leftward and upward of the cylinder axial line CA, an axial line 55C of a plug hole 55 is inclined relative to the cylinder axial line CA so as to diverge leftward of the cylinder axial line CA while extending away from an ignition opening 55A along the cylinder axial line CA. The plug hole 55 is located between a first intake port 51 and a first exhaust port 61. A water jacket 10A includes a middle passage 30 including an inter-port passage 31 that is located between the first exhaust port 61 and a second exhaust port 62 and downward of the cylinder axial line CA, and an extension passage 32 extending upward from the inter-port passage 31 to a position that is upward of the cylinder axial line CA.