Cylinder Head Cooling Structure with Parallel Radial Passages
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Solution Overview
Problem
Conventional cooling structures for cylinder heads, particularly in large engines, often inadequately cool thermally critical areas such as exhaust valve bridges and intake-exhaust valve bridges due to restricted heat discharge and insufficient coolant flow in these regions.
Innovation Solution
The cooling structure incorporates a dual outer cooling chamber arrangement with flow-restricting passages, where the second outer cooling chamber is connected to the centre cooling chamber via intake radial passages, allowing coolant to flow primarily through the exhaust valve bridges and surrounding exhaust valve seats, while also cooling intake and intake-exhaust valve bridges through parallel and serial radial passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional bottom-up radial cooling concepts are applied with coolant entering the lower cooling jacket and flowing directly from outside cooling chambers radially towards the centre cooling chamber, then the cooling structure is simple, but the heat discharge in the region of exhaust valve bridges and intake-exhaust valve bridges is restricted and insufficient
Solution Approach 1:
The cooling jacket is segmented into multiple cooling chambers (first outer cooling chamber, second outer cooling chamber, centre cooling chamber) with separate flow paths. The first radial passage and second radial passage are streamed hydraulically in parallel, creating distinct cooling zones that target different thermal requirements in the cylinder head.
Solution Approach 2:
Different regions of the cooling jacket are designed with different cooling capacities and flow characteristics. The first outer cooling chamber and second outer cooling chamber are positioned to provide enhanced cooling to specific areas (exhaust valve bridge region and intake-exhaust valve bridge region respectively), matching the local thermal loads of these critical zones.
2Temperature
If radial cooling passages are arranged to cool exhaust valve bridges and intake-exhaust valve bridges, then cooling effectiveness improves, but the device complexity increases with multiple passages and chambers
Solution Approach 1:
Multiple cooling functions are merged into a single integrated cooling jacket structure. The first outer cooling chamber, second outer cooling chamber, and centre cooling chamber work together as a unified system, with radial passages serving both exhaust and intake valve bridge regions through coordinated parallel flow paths.
Solution Approach 2:
The cooling jacket serves multiple cooling functions simultaneously through its multi-chamber design. The same cooling system cools the exhaust valve bridge region, intake-exhaust valve bridge region, and provides general cylinder head cooling, making the system multi-functional rather than requiring separate dedicated cooling systems for each zone.
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 enhances cooling capacity by directing higher flow rates to hot regions, ensuring efficient heat discharge from thermally critical areas, including exhaust valve bridges and intake-exhaust valve bridges, thereby improving overall engine cooling efficiency.
Implementation Method 1
coolant enters into a lower cooling jacket and flows directly from outside cooling chambers radially towards the centre cooling chamber
Implementation Method 2
discharge of heat in the region of exhaust valve bridges or intake-exhaust valve bridges
Data Source
Figure 1~2
Figure 3~6
Figure 5
AI summary
The invention relates to a cooling structure (1) for a cylinder head (2) of an internal combustion engine with at least two exhaust valves (3, 4) and at least one intake valve (5, 6) per cylinder, wherein at least one exhaust valve bridge (8) is located between two adjacent exhaust valves (3, 4) and at least two intake-exhaust valve bridges (10, 11) are located each between an exhaust valve (3, 4) and an adjacent intake valve (5, 6), the cooling structure (1) comprising a lower first cooling jacket (12) adjacent to a fire deck (13) and an upper second cooling jacket (14) adjacent to an intermediate deck (15), the first and second cooling jackets (12, 14) being flow connected by at least one transfer opening (27, 31) of the intermediate deck (15), the first cooling jacket (3) including at least one centre cooling chamber (17) and an outer cooling chamber arrangement with at least one first outer cooling chamber (16), the outer cooling chamber (16) and the centre cooling chamber (17) being flow connected by at least one exhaust side first radial passage (19) extending in a region of the exhaust valve bridge (8) and by at least one second radial passage (20, 21), wherein the first radial passage (19) and the second radial passage (20, 21) are streamed hydraulically in parallel. The outer cooling chamber arrangement of the first cooling jacket (3) comprises at least one first outer cooling chamber (16) and at least one second outer cooling chamber (29) which is separated from the first outer cooling chamber (16) by at least one flow restricting passage, wherein the second outer cooling chamber (29) is flow connected with the centre cooling chamber (17) by at least one intake radial passage (24, 25, 26) extending in a region of an intake valve bridge (9) and/or in a region of the intake-exhaust valve bridge (10, 11).