Liquid-Cooled Cylinder Head Dome Cooling Ribs
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Solution Overview
Problem
Increased engine power can lead to the formation of a hot area in the dome region of liquid-cooled cylinder heads, which is not adequately cooled by existing designs.
Innovation Solution
The introduction of first and second flow-guiding ribs, with a gap between them, directs coolant flow effectively around the dome, enhancing cooling by creating a larger cooling surface and preventing short-circuit coolant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If engine power is increased, then power output is improved, but hot areas form in the dome region due to insufficient cooling
Solution Approach 1:
The coolant channel is segmented by dividing it into multiple sections using flow-guiding ribs. The first flow-guiding rib divides the coolant channel into a first section and a second section, while the second flow-guiding rib further divides it into third and fourth sections. This segmentation allows coolant to flow through multiple paths around the dome, ensuring comprehensive cooling coverage and preventing hot areas from forming in the dome region even at high engine powers.
Solution Approach 2:
Flow-guiding ribs are strategically positioned at specific locations within the coolant channel to optimize cooling in the dome region. The first flow-guiding rib is arranged in the gusset area between outlet channels, and the second flow-guiding rib is positioned on the dome surface. This local modification of the coolant flow path ensures that critical areas like the dome receive adequate cooling without requiring a complete redesign of the entire cooling system.
2Temperature
If coolant flow path is extended to cool the dome, then cooling effect is improved, but coolant short-circuiting reduces efficiency
Solution Approach 1:
The flow-guiding ribs are positioned to redirect coolant flow before it reaches the dome area. The first flow-guiding rib in the gusset area and the second flow-guiding rib on the dome surface work together to ensure coolant flows through the intended path around the dome, preventing short-circuiting and ensuring the coolant cools the dome region effectively before returning to the crankcase.
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 configuration prevents the formation of hot areas and improves cooling efficiency, increasing fatigue strength and allowing the cylinder head to be used for both diesel and Otto engines.
Implementation Method 1
the coolant flows through the three coolant inflow openings into the cylinder head, flows around the outlet channel walls and the area of the valve seat rings in a spectacle-shaped manner, and flows further in the direction of the dome
Implementation Method 2
which is charged with coolant through three inlet bores in a cylinder head parting plane from the crankcase
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
The head (1) has a dome (6) surrounded by a cooling agent channel (2) and spaced from a gusset area (5) formed by exhaust duct walls (3, 4), where the channel has an inflow opening (2`) arranged between the walls and other inflow openings. The channel is extended over a combustion chamber and between the walls based on the opening (2`), and is extended over the chamber and radially around the walls based on the latter openings. The channel is extended towards an inlet side of the head based on the dome. A flow guiding rib (7) extended in the direction of the dome is arranged in the gusset area.