Liquid-Cooled Cylinder Head With Force Distribution Ring
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Solution Overview
Problem
Prior cylinder heads experience deformations and leakage due to localized force application from cylinder head screws, affecting the cylinder head gasket and valve guides, leading to uneven loads and wear.
Innovation Solution
A cylinder head design featuring a fixed connection between valve guides and cylinder head screws through a ring and supports that extend from the oil deck to the fire deck, allowing for uniform force distribution and indirect connection, thereby decoupling the valve guides from direct force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cylinder head screws are used to fasten the cylinder head, then the cylinder head can be securely attached to the engine block, but localized deformations occur at the screw attachment points causing gasket damage and leakage
Solution Approach 1:
A force distribution element (FVE) is introduced as an intermediary component between the cylinder head screws and the cylinder head. This FVE distributes the localized screw forces across a broader area of the cylinder head, preventing stress concentration and deformation at the attachment points while maintaining secure fastening. The FVE acts as a mediator that transforms point loads into distributed loads.
Solution Approach 2:
The force transmission path is segmented by introducing the FVE as a separate component. Instead of direct force transmission from screws to cylinder head, the force path is divided into: screws → FVE → cylinder head. This segmentation allows the FVE to independently manage force distribution while the cylinder head maintains its structural integrity.
2Stability of the object's composition
If cylinder head screws are used to secure the cylinder head, then the attachment is stable, but the valve guides experience deformation and uneven loads causing premature wear
Solution Approach 1:
The FVE serves as a mediator that decouples the valve guides from direct exposure to screw-induced deformations. By distributing forces before they reach the cylinder head structure, the FVE protects the valve guides from uneven loads and stress concentrations, thereby extending their service life while maintaining overall cylinder head stability.
3Temperature
If cooling jackets are provided for liquid cooling, then the cylinder head can be cooled effectively, but the coolant flow may be insufficient in critical areas
Solution Approach 1:
The cooling system is segmented into multiple independent cooling jackets (first cooling jacket and second cooling jacket) that can be separately optimized. This segmentation allows different coolant flow paths to target different thermal zones within the cylinder head, improving overall cooling efficiency and ensuring adequate coolant flow to critical areas such as valve seats and combustion chamber regions.
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 reduces deformations and leakage by evenly distributing forces, enhancing the stability and reducing wear on valve guides and the cylinder head gasket, while also improving coolant flow velocities through partitioned cooling jackets.
Implementation Method 1
a liquid-cooled cylinder head having a component extending into a combustion chamber
Implementation Method 2
liquid-cooled cylinder head
Data Source
AI summary
Various embodiments of the present disclosure are directed to liquid-cooled cylinder heads. In one example embodiment, a cylinder head is disclosed including a component which extends into a combustion chamber, an upper cooling jacked, a lower cooling jacket, a plurality of valves arranged around the component, a plurality of cylinder head screws, an oil deck, a fire deck, a plurality of valve guides, and a fixed connection. The fixed connection is arranged from each valve guide to the component, and is a ring having at least one support. The support and the ring extend at least from the oil deck to the fire deck thereby bounding the combustion chamber, and the component is connected to the plurality of cylinder head screws.