Cylinder Head Web Cooling via Oblique Deflection
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Solution Overview
Problem
Cylinder heads for internal combustion engines face challenges in cooling the 'web' region surrounding spark plug and injection nozzle openings, leading to inefficient heat removal and reduced engine service life due to complex geometries and limited coolant access.
Innovation Solution
A cylinder head design featuring a cooling duct system with an annular wall section and a web cooling duct that deflects coolant obliquely downward toward the combustion chamber section, utilizing 3D printing to create complex geometries and enhance coolant flow, including an extension to guide coolant closer to the combustion chamber for improved heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling ducts are guided around gas ducts and openings in conventional cylinder heads, then the cooling system can be implemented, but the web region becomes difficult to cool due to complex geometries
Solution Approach 1:
The cooling duct system is divided into multiple separate ducts: outer cooling ducts for the outer regions and a central cooling duct for the web region. This segmentation allows each duct to be optimized for its specific location without being constrained by the need to navigate around all other components, thereby improving web cooling efficiency while maintaining manageable geometric complexity.
Solution Approach 2:
The cooling ducts extend in the vertical direction (z-direction) between the gas ducts, utilizing the third dimension to access the web region. By routing ducts from above and below the combustion chamber section, the design overcomes the planar limitations that would otherwise prevent coolant access to the centrally located web area.
2Adaptability or versatility
If the web region is surrounded by gas ducts in four-valve cylinder heads, then valve configuration is achieved, but coolant flow to the web is blocked
Solution Approach 1:
The cooling system is segmented into outer cooling ducts positioned laterally and a central cooling duct positioned vertically between the gas ducts. This segmentation allows the four-valve configuration to be maintained while providing dedicated coolant flow paths that bypass the obstruction created by the surrounding gas ducts and reach the web region effectively.
Solution Approach 2:
Different regions of the cylinder head are provided with different cooling duct configurations tailored to their specific cooling needs. The web region receives targeted cooling from the central duct that penetrates between the gas ducts, while outer regions are cooled by the outer cooling ducts, ensuring optimal temperature control in each local area without compromising the overall valve configuration.
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 design achieves efficient cooling of the web region, effectively removing heat and increasing engine service life by ensuring uniform coolant flow and reduced temperature in the web area.
Implementation Method 1
The upper wall has a guiding surface which is directed obliquely downward in the region of the annular wall section, in order to deflect coolant in the direction of the combustion chamber section
Implementation Method 2
The coolant flows obliquely upward in the region of the coolant-inlet-side gas ducts and is then deflected downward in the direction of the web by the guiding surface which is directed obliquely downward. The coolant thereby flows directly toward the web, as a result of which efficient cooling of the web is achieved.
Implementation Method 3
The heat transmitted to the web by the combustion operation can therefore be efficiently removed
Data Source
AI summary
A cylinder head for an internal combustion engine with at least one cylinder has a cooling duct system which has a coolant inlet side and a coolant outlet side, a combustion chamber section, two coolant-inlet-side gas ducts, two coolant-outlet-side gas ducts and two adjacent component openings, such as a spark plug opening and an injection nozzle opening. The cylinder head has an annular wall section provided between the component openings, on the one hand, and the gas ducts, on the other hand. The cooling duct system has a web cooling duct which runs into the annular wall section, extends between the coolant-inlet-side gas ducts and has an upper wall. The upper wall has a guiding surface which is directed obliquely downwards in the region of the annular wall section in order to deflect coolant in the direction of the combustion chamber section.