Cylinder Bore Wall Insulating Member for Uniform Temperature

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Solution Overview

Problem

Internal combustion engines experience a significant difference in thermal deformation between the upper and lower areas of the cylinder bore wall due to temperature variations, leading to increased friction and fuel consumption, which existing technologies have not adequately addressed.

Innovation Solution

A cylinder bore wall insulating member is disposed to contact the cylinder bore wall, defining a groove-like coolant passage, preventing direct coolant contact and ensuring uniform temperature distribution by using a curved contact surface made of materials like EPDM or NBR, which provides excellent elasticity and heat resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If coolant flows directly through the groove-like coolant passage, then cooling efficiency is improved, but temperature uniformity deteriorates

Engineering Contradiction:

Improvecooling efficiencyVSAvoidtemperature uniformity

Core Design Contradiction:

TemperatureVSStability of the object's composition

Solution Approach 1:

The insulating member is selectively positioned at specific locations within the coolant passage to provide localized thermal insulation. This allows different regions of the cylinder bore wall to have different thermal characteristics, preventing excessive cooling in certain areas while maintaining overall cooling efficiency

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The insulating member acts as an intermediary element between the coolant and the cylinder bore wall. It mediates the heat transfer process by allowing controlled thermal interaction, preventing direct and excessive cooling of the bore wall while maintaining necessary temperature management

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by moving object

If thermal deformation difference is reduced, then fuel consumption is reduced, but cooling efficiency may deteriorate

Engineering Contradiction:

Improvefuel consumptionVSAvoidcooling efficiency

Core Design Contradiction:

Use of energy by moving objectVSTemperature

Solution Approach 1:

The insulating member provides localized thermal management at specific regions of the coolant passage, allowing differential thermal characteristics that simultaneously reduce thermal deformation differences and maintain adequate cooling efficiency

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The insulating member modifies the thermal parameters (heat transfer coefficients, thermal conductivity) in specific regions of the coolant passage, creating an optimized thermal environment that reduces thermal deformation while preserving cooling efficiency

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

The solution achieves a uniform temperature distribution across the cylinder bore wall, reducing thermal deformation differences and enhancing fuel efficiency by minimizing friction between the piston and cylinder bore wall.

Implementation Method 1

a cylinder bore wall insulating member (1a) having a contact surface (5a) that comes in contact with a wall surface (17) of a cylinder bore wall (13)

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS10077736B2Heat retention member for cylinder bore wall, internal combustion engine, and automobile

Publication Date: 2018.09.18 NICHIAS CORP

AI summary

A cylinder bore wall insulating member has a contact surface that comes in contact with a wall surface of a cylinder bore wall that forms a cylinder block of an internal combustion engine and defines a groove-like coolant passage. An internal combustion engine in which the cylinder bore wall has a uniform temperature may be obtained using the insulating member.