Internal Combustion Engine Cooling System with Segmented Water Jackets

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Solution Overview

Problem

Existing internal combustion engine cooling systems are complex and costly due to their dual independent circulation systems, which complicate configuration and increase manufacturing costs.

Innovation Solution

A simplified cooling system design for internal combustion engines, featuring a single circulation system with a first water jacket around intake sides of cylinders and a second water jacket around exhaust sides, where the first water jacket has an inflow port and communicates with an in-head water jacket in the cylinder head, optimizing coolant flow rates and passage areas to enhance cooling efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If two independent circulation systems are used to cool the cylinder head and cylinder block separately, then the temperature control of cylinder head and cylinder block can be independent, but the configuration becomes complicated and manufacturing cost increases

Engineering Contradiction:

Improvetemperature control independenceVSAvoidcooling system configuration

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The cooling system is segmented into two separate water jackets (first water jacket for cylinder head, second water jacket for cylinder block) within a single circulation system. This allows independent temperature control of different components while sharing common cooling infrastructure, resolving the contradiction between temperature control independence and system complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The single circulation system serves multiple functions by distributing coolant to different water jackets for different cooling zones. The circulation system performs both cylinder head cooling and cylinder block cooling simultaneously, eliminating the need for separate independent systems while maintaining temperature control independence.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Temperature

Engineering Contradiction:

Improvetemperature control independenceVSAvoidmanufacturing cost

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The patent merges two independent circulation systems into a single circulation system that serves both cooling needs. By combining the coolant supply system while maintaining separate water jackets, the manufacturing cost is reduced through fewer pumps, radiators, and control systems, while still achieving independent temperature control.

Inventive Principle:

Principle #5Merging (Combining)

3Temperature

If coolant flow rate to intake-side is increased, then cooling efficiency of intake port region is improved, but coolant flow to other regions may be reduced

Engineering Contradiction:

Improvecooling efficiency of intake port regionVSAvoidcoolant flow rate distribution

Core Design Contradiction:

TemperatureVSQuantity of substance

Solution Approach 1:

The patent applies local quality by providing enhanced coolant flow specifically to the intake-side regions through the first water jacket and intake-side flow passages. The flow passage cross-sectional areas are optimized to direct higher coolant flow rates to areas requiring intensive cooling (intake ports and intake sides) while maintaining adequate flow to exhaust regions, achieving localized cooling enhancement without compromising overall cooling balance.

Inventive Principle:

Principle #3Local quality

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 simplified cooling system effectively cools both the cylinder head and block while reducing manufacturing costs by eliminating redundant circulation systems and optimizing coolant flow, thereby improving engine performance and reducing the risk of knocking.

Implementation Method 1

a cooling system in which water jackets are provided in a cylinder block and a cylinder head of an internal combustion engine body respectively, and the cylinder block and the cylinder head are cooled by circulating coolant through these water jackets

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

the temperatures of coolant can be controlled in the first circulation system and the second circulation system separately from each other

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS11181033B2Internal combustion engine body

Publication Date: 2021.11.23 TOYOTA JIDOSHA KK

AI summary

An internal combustion engine body includes a cylinder block including a plurality of cylinders, a first water jacket, and a second water jacket, and a cylinder head including an in-head water jacket. The in-head water jacket includes an intake-side flow passage. The cylinder block and the cylinder head are provided such that a flow rate of coolant that directly flows into the intake-side flow passage after flowing into the first water jacket is higher than a flow rate of coolant directly flows into any region other than the intake-side flow passage after flowing into the first water jacket.