Flywheel Housing Exhaust Gas Cleaning Device Mounting

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In work vehicles like backhoes, the limited mounting space and engine vibrations pose challenges for efficiently integrating a diesel engine with an exhaust gas cleaning device, as well as maintaining the required high exhaust gas temperature and protecting the device from cooling air and vibrations.

Innovation Solution

The exhaust gas cleaning device is positioned on the flywheel housing, leeward of the cooling fan, with a support body and arranged close to the cylinder head, and the air cleaner is placed lower than the engine's upper surface, allowing for compact arrangement and effective heat retention, while the exhaust gas pipe communicates with the counterweight to maintain a short length and improve fitting workability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the exhaust gas cleaning device is arranged in the exhaust gas path of the diesel engine, then the exhaust gas can be cleaned effectively, but the mounting space becomes more constrained and the device is exposed to engine vibrations

Engineering Contradiction:

Improveexhaust gas cleaning functionVSAvoidmounting space

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The exhaust gas cleaning device is arranged in the vertical dimension above the flywheel housing rather than horizontally in the traditional exhaust path, utilizing the vertical space above the engine to accommodate the device without increasing the horizontal footprint

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

A support body is introduced as an intermediary structure to connect the exhaust gas cleaning device to the flywheel housing, providing vibration isolation and flexible mounting while maintaining the cleaning function

Inventive Principle:

Principle #24Intermediary (Mediator)

2Power

If the cooling fan blows cooling air directly on the exhaust gas cleaning device, then the engine cooling is improved, but the temperature of the exhaust gas cleaning device is lowered which affects its function

Engineering Contradiction:

Improveengine cooling efficiencyVSAvoidexhaust gas cleaning device temperature

Core Design Contradiction:

PowerVSTemperature

Solution Approach 1:

The exhaust gas cleaning device is positioned asymmetrically on one side of the engine (above the flywheel housing) rather than centrally, creating an arrangement where the cooling fan's airflow path does not directly intersect with the exhaust gas cleaning device, thus protecting it from excessive cooling

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The support body acts as a mediator between the cooling fan and the exhaust gas cleaning device, allowing the cooling fan to operate freely while preventing its cooling air from directly reaching the temperature-sensitive exhaust gas cleaning device

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If the exhaust gas cleaning device is mounted directly on the engine, then the mounting structure is simplified, but the device is directly exposed to engine vibrations which can damage it

Engineering Contradiction:

Improvemounting structureVSAvoiddevice protection from vibrations

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The support body serves as a vibration-isolating intermediary between the engine and the exhaust gas cleaning device, absorbing and dampening engine vibrations while maintaining a relatively simple overall mounting structure

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The support body is designed with vibration-absorbing characteristics beforehand to cushion the exhaust gas cleaning device against engine vibrations before they can cause damage, providing proactive protection

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

4Volume of moving object

If various parts (air cleaner, radiator, battery) are arranged efficiently in narrow mounting space, then the vehicle compactness is improved, but the arrangement becomes more complex and maintenance access is restricted

Engineering Contradiction:

Improvevehicle compactnessVSAvoidmaintenance access

Core Design Contradiction:

Volume of moving objectVSEase of operation

Solution Approach 1:

The exhaust gas cleaning device is positioned in the vertical dimension above the flywheel housing, utilizing unused vertical space rather than horizontal space, thereby maintaining vehicle compactness while providing accessible positioning for maintenance

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The support body provides a flexible mounting interface that allows for maintenance access while maintaining the compact arrangement, enabling the device to be serviced without requiring disassembly of surrounding components

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8678127B2Work vehicle-mounted engine device

Publication Date: 2014.03.25 YANMAR POWER TECH CO LTD

AI summary

A work vehicle limited in a mounting space is adapted to have an engine, which is provided with an exhaust gas cleaning device, easily arranged therein. An engine device, which is to be mounted on the work vehicle, is provided with the engine mounted on a machine body and covered with a hood, an air cleaner for cleaning air introduced into the engine, and an exhaust gas cleaning device for cleaning exhaust gas from the engine. The exhaust gas cleaning device is arranged on a flywheel housing fitted on one side portion of the engine.