Cylinder Head Cooling Jacket Segmentation for Exhaust Manifold

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Solution Overview

Problem

Cylinder heads with integrated exhaust manifolds experience non-uniform cooling, leading to overheating and temperature inconsistencies between exhaust conduits, as the longitudinal flow of cooling fluid does not effectively cool all portions of the head.

Innovation Solution

The cylinder head design features a lower cooling jacket divided into transverse chambers for each engine cylinder, an intermediate cooling jacket extending along the head's entire length, and an upper cooling jacket with a central portion and auxiliary outlet, forcing the cooling fluid to flow transversely through the chambers, ensuring uniform cooling and reducing overheating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the cooling fluid flows longitudinally through the cooling jackets, then the cooling system is simple in structure, but the cooling is non-uniform and overheating occurs in certain portions of the head

Engineering Contradiction:

Improvecooling system structureVSAvoidtemperature uniformity

Core Design Contradiction:

Device complexityVSTemperature

Solution Approach 1:

The lower cooling jacket is divided into multiple separate transverse chambers (first, second, third chambers) that are longitudinally spaced apart, with the cooling fluid flowing transversely through each chamber. This segmentation ensures that cooling fluid is distributed uniformly across different portions of the cylinder head, preventing localized overheating while maintaining relatively simple overall structure.

Inventive Principle:

Principle #1Segmentation

2Temperature

If the exhaust manifold portions are superimposed and spaced apart, then cooling uniformity is improved, but the device complexity increases

Engineering Contradiction:

Improvecooling uniformityVSAvoidexhaust manifold structure

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The exhaust manifold is integrated directly into the cylinder head body as a single cast piece, merging the exhaust manifold structure with the cylinder head. The manifold portions are superimposed and spaced apart to improve cooling uniformity, while the integration eliminates separate manifold components and reduces overall device complexity.

Inventive Principle:

Principle #5Merging (Combining)

3Temperature

If the lower cooling jacket is divided into separate transverse chambers, then cooling uniformity is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improvecooling uniformityVSAvoidcooling jacket manufacturing

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The lower cooling jacket is segmented into multiple separate transverse chambers that are longitudinally spaced apart, allowing the cooling fluid to flow transversely through each chamber. This segmentation achieves uniform cooling distribution across different cylinder portions while the chambers are designed as integrated features of the cylinder head body, maintaining manufacturability.

Inventive Principle:

Principle #1Segmentation

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 ensures uniform cooling of the exhaust manifold and reduces overheating by optimizing the flow of cooling fluid, providing effective temperature distribution across all engine cylinder portions.

Implementation Method 1

the lower cooling jacket is longitudinally divided into a plurality of separate transverse chambers associated to various engine cylinders... forcing the cooling fluid to flow transversely through the chambers

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 2

ensuring uniform cooling and reducing overheating... providing effective temperature distribution across all engine cylinder portions

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Data Source

PatentUS8671904B2Cylinder head for an internal combustion engine, with integrated exhaust manifold and subgroups of exhaust conduits merging into manifold portions which are superimposed and spaced apart from each other

Publication Date: 2014.03.18 FIAT POWERTRAIN TECHNOLOGIES

AI summary

A cylinder head for an internal combustion engine has a body integrating in a single cast piece, the exhaust manifold. The exhaust conduits form separate subgroups merging into manifold portions superimposed and spaced apart from each other. A lower cooling jacket, an upper cooling jacket and an intermediate cooling jacket are formed in the head. The lower cooling jacket is longitudinally divided into a plurality of separate transverse chambers, while the upper cooling jacket has a portion extended longitudinally over the entire development of the head. The lower cooling jacket has a portion extending in the area of the body which separates the superimposed portions of the subgroups of exhaust conduits. The intermediate jacket forms a main outlet at an end of the head. The upper jacket has a first portion at the center of the head and a second portion forming an auxiliary circuit adjacent to said main outlet.