Cylinder Head Cooling Channels via Modular Sand Core

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Solution Overview

Problem

Existing methods for casting cylinder heads with cooling channels for valve seat rings in piston engines face challenges in sealing and efficient cooling, leading to inefficiencies and increased costs due to mechanical drilling for fluid injection.

Innovation Solution

A method involving a separate cooling channel core mounted between a bottom plate and a cylinder head water core, allowing preassembly and integration of cooling channels that enclose valve seat rings without direct contact, using a sand core configuration to create channels that surround intake and exhaust valves, enabling effective fluid flow and reducing production costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If cooling channels are created by mechanical drilling, then cooling fluid can be injected directly, but production costs increase and sealing issues arise

Engineering Contradiction:

Improveproduction costVSAvoidsealing

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The cooling channel core is divided into separate modular sections that can be independently manufactured and then assembled together within the casting mold. This segmentation allows for easier manufacturing of complex cooling channel geometries while maintaining sealing integrity through standardized connection interfaces between segments.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cooling channel core is pre-assembled with all cooling channels and connections before being placed in the casting mold. This preliminary action ensures that sealing surfaces are established before the casting process, eliminating sealing issues that would arise from post-casting mechanical drilling.

Inventive Principle:

Principle #10Preliminary action

2Temperature

If cooling channels are positioned close to valve seat rings for effective cooling, then heat dissipation improves, but sealing off the valve seat ring from combustion chamber becomes difficult

Engineering Contradiction:

Improvevalve seat ring coolingVSAvoidsealing

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The cooling channel core acts as an intermediary structure that is positioned between the bottom plate and the cylinder head water core. This intermediary allows cooling channels to be placed in optimal positions for heat dissipation while the core itself provides the sealing function, separating the cooling fluid path from the combustion chamber and valve areas.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If separate cooling channel core is pre-assembled in bottom plate, then production economy improves, but core mounting precision must be maintained

Engineering Contradiction:

Improveproduction economyVSAvoidcore mounting precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The design incorporates standardized mounting parameters and interface geometries between the cooling channel core segments and the bottom plate. By defining precise mounting parameters in advance, the system achieves both production economy through pre-assembly and maintains the required mounting precision through standardized interfaces.

Inventive Principle:

Principle #35Parameter changes

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 method provides economical production of cooling channels that effectively dissipate heat from valve seat rings and valves, achieving homogeneous surface temperatures and reducing cylinder head temperature, while avoiding sealing issues and mechanical drilling costs.

Implementation Method 1

cooling channels that effectively dissipate heat from valve seat rings and valves, achieving homogeneous surface temperatures and reducing cylinder head temperature

Methodology Applied

Scientific EffectHeat dissipation: Convection

Data Source

PatentUS8151743B2Cooling channels in the cylinder head of an internal combustion engine

Publication Date: 2012.04.10 DR ING H C F PORSCHE AG

AI summary

In a method for casting a cylinder head of a piston engine in a region of cooling channels for valve seat rings, a separate core is provided for defining cooling channels, and the cooling channel core is mounted in a bottom plate of a casting mold at various points thereof. The cooling channels for the valve seat rings have a cooling channel region formed by two interconnected rings and at least one cooling fluid supply channel and at least one cooling fluid drain channel. The two rings are disposed at a distance from the valve seat rings, adjacent to them.