Exhaust Throttle Device Rigidity and Heat Shielding

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Solution Overview

Problem

Conventional exhaust throttle devices in engine systems face challenges in reducing the capacity of the exhaust gas intake side and maintaining suitable exhaust gas temperature for purification, due to the influence of radiation heat from the exhaust manifold, which can lead to abnormal operation and incomplete regeneration of soot filters.

Innovation Solution

The engine device incorporates a high rigidity support structure for the exhaust throttle device, with the throttle valve case fastened to the exhaust manifold and a relay pipe in a multi-layered configuration, along with a heat shield member to block radiation heat, allowing precise adjustment of exhaust gas pressure and temperature maintenance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the throttle valve case is connected to the exhaust manifold through a relay pipe, then the exhaust throttle device can be installed separately, but the capacity of the exhaust gas intake side cannot easily be reduced and the extending direction of the exhaust pipe is specified

Engineering Contradiction:

Improveinstallation flexibilityVSAvoidexhaust gas intake side capacity

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The patent merges the relay pipe function into the exhaust manifold by directly fastening the throttle valve case to the exhaust manifold. This integration eliminates the need for a separate relay pipe connection, reducing the exhaust gas intake side capacity while maintaining installation flexibility through the standardized fastening interface.

Inventive Principle:

Principle #5Merging (Combining)

2Measurement precision

If the exhaust throttle device is placed near the exhaust manifold, then exhaust gas pressure can be adjusted, but the electric part receives influence of radiation heat and abnormal operation occurs

Engineering Contradiction:

Improveexhaust gas pressure adjustment precisionVSAvoidradiation heat influence

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a heat shield member as an intermediary between the exhaust manifold and the exhaust throttle device. This heat shield blocks radiation heat from reaching the electric parts of the throttle device, protecting them from abnormal operation while allowing the device to remain positioned for precise exhaust gas pressure adjustment.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the exhaust throttle device is positioned to maintain exhaust gas temperature, then purification performance is maintained, but the electric part is affected by heat from the exhaust manifold

Engineering Contradiction:

Improvepurification performanceVSAvoidheat influence on electric part

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The heat shield member serves as a thermal intermediary, allowing the exhaust throttle device to remain in position for maintaining exhaust gas temperature and purification performance, while simultaneously blocking harmful radiation heat from reaching the electric components.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If a heat shield member is added to block radiation heat, then abnormal operation is prevented, but device complexity increases

Engineering Contradiction:

Improveoperation stabilityVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs a heat shield member that functions as a thin thermal barrier. This approach provides effective radiation heat blocking to prevent abnormal operation while minimizing the increase in device complexity through the use of a relatively simple, thin-shield structure rather than a bulky insulation system.

Inventive Principle:

Principle #30Flexible shells and thin films

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 reduces the capacity of the exhaust gas intake side, enables precise adjustment of exhaust gas pressure, and effectively maintains suitable temperatures for purification, preventing abnormal operation and ensuring complete regeneration of soot filters.

Implementation Method 1

there is a problem that the exhaust throttle device receives influence of radiation heat of the exhaust manifold and abnormal operation of the exhaust throttle device occurs

Methodology Applied

Scientific EffectRadiation heat: Thermal Radiation

Implementation Method 2

an EGR cooler for cooling EGR gas is placed below the throttle valve case such that EGR cooler and the throttle valve case sandwich the exhaust manifold

Methodology Applied

Scientific EffectHeat exchange: Heat Exchanger

Data Source

PatentUS9222381B2Engine device

Publication Date: 2015.12.29 YANMAR POWER TECH CO LTD

AI summary

An engine device in which a support structure of an exhaust throttle device can be made as a high rigidity structure, and it is possible to prevent the exhaust throttle device from being heated by radiation heat from peripheries of the exhaust throttle device. The engine device of the invention includes an engine having an exhaust manifold, and the exhaust throttle device adjusts exhaust gas pressure of the exhaust manifold An exhaust gas intake side of a throttle valve case of the exhaust throttle device is fastened to an exhaust gas outlet of the exhaust manifold, and an exhaust gas pipe is connected to the exhaust manifold through the throttle valve case. An intermediate portion of a cooling pipe of an EGR cooler is provided with a cooling water pipe of the exhaust throttle device.