Engine Water Jacket Cross-Flow Cooling Design

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Solution Overview

Problem

Existing water jackets for internal combustion engines face challenges in managing and calibrating coolant flows, leading to inefficiencies, high pressure drops, and increased production costs due to casting and manufacturing difficulties.

Innovation Solution

A water jacket design with integrated side passages and branches that transform longitudinal coolant flow into cross flow over the cylinder head, allowing for calibrated coolant distribution and improved efficiency without external devices, and includes dedicated channels for specific components to optimize cooling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If coolant flows in the engine block on both sides of the cylinder head through known water jackets, then cooling coverage is provided, but difficulties arise in managing and calibrating coolant flows leading to poor balancing among cylinders

Engineering Contradiction:

Improvecoolant flow balancingVSAvoidcoolant flow management complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The water jacket is divided into a first water jacket for the intake side and a second water jacket for the exhaust side, with separate side passages and branches for each. This segmentation allows independent calibration and management of coolant flows on each side, eliminating the balancing difficulties that arise when both sides share a common cooling circuit.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each side passage is equipped with dedicated branches that have specifically designed cross-sectional areas and flow paths tailored to the local cooling requirements of each cylinder. This local customization enables precise flow calibration for each cylinder, achieving balanced cooling performance across all cylinders.

Inventive Principle:

Principle #3Local quality

2Loss of energy

If traditional water jacket designs are used, then cooling function is provided, but high pressure drop occurs and significant coolant volume is required

Engineering Contradiction:

Improvepressure dropVSAvoidcoolant volume

Core Design Contradiction:

Loss of energyVSQuantity of substance

Solution Approach 1:

The side passages are configured to extend in the longitudinal direction of the engine block, creating a three-dimensional cooling network that efficiently distributes coolant. This spatial arrangement reduces flow path length and resistance, lowering pressure drop while maintaining effective cooling with reduced coolant volume.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The water jacket design incorporates variable cross-sectional areas in the side passages and branches, optimized to maintain appropriate flow velocities throughout the system. This dynamic geometry ensures efficient heat transfer while minimizing pressure losses and reducing the total coolant volume required.

Inventive Principle:

Principle #15Dynamics

3Ease of manufacture

If known water jacket designs are implemented, then cooling is provided, but production costs increase due to casting and manufacturing difficulties

Engineering Contradiction:

Improvecasting and manufacturing easeVSAvoidproduction cost

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The first and second water jackets are integrated into a single casting piece that includes both the intake side and exhaust side cooling circuits. This merging of functions into one component eliminates the need for separate castings and complex assembly operations, significantly reducing production costs while maintaining manufacturing feasibility.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The integrated water jacket design provides multiple functions within a single component: cooling for both intake and exhaust sides, flow calibration for each cylinder, and pressure drop reduction. This multi-functionality reduces the total number of parts and manufacturing steps, lowering production costs.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 balanced and efficient coolant flow, reduces pressure drop, and lowers production costs by integrating features within the cylinder head casting, enhancing cooling performance and component-specific cooling without external devices.

Implementation Method 1

a coolant pump that delivers a coolant fluid, typically a mixture of water and antifreeze... to remove additional excess heat

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS10184420B2Water jacket for an internal combustion engine

Publication Date: 2019.01.22 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A water jacket having a coolant flow crossing the space over the cylinder head is provided for an internal combustion engine of an automotive system. The internal combustion engine is equipped with a cylinder and a cylinder head. The water jacket includes a lower water jacket having side passages surrounding the cylinder and connected together by a plurality of branches disposed over the cylinder head, so as to create the coolant flow crossing the space over the cylinder head.