LPG-Powered Ground Compactor Vibration Damping

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Solution Overview

Problem

Hand-guided ground compacting machines face challenges with high emission levels, particularly from diesel engines, and limited operating periods due to expensive electrical alternatives, necessitating a solution for low-emission, cost-effective, and reliable operation.

Innovation Solution

The implementation of a liquid gas powered driving engine with a storage container system, including vibration-cushioned storage container holding means and a piping system for efficient fuel supply, utilizing liquefied petroleum gas (LPG) to reduce emissions and enhance operating duration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a diesel engine is used as the driving engine, then the machine provides sufficient power for ground compaction, but the emission levels are high with significant carbon monoxide and soot

Engineering Contradiction:

Improvedriving powerVSAvoidemission levels

Core Design Contradiction:

PowerVSObject-generated harmful factors

Solution Approach 1:

The patent changes the fuel type parameter from diesel to liquid gas (LPG), which fundamentally alters the combustion characteristics. This parameter change reduces carbon monoxide and soot emissions while maintaining adequate power output for ground compaction operations.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes the phase transition properties of liquid gas (propane/butane mixture) which is stored in liquid form and vaporized during combustion. This phase change enables cleaner burning compared to diesel, reducing harmful emissions while providing the necessary energy density.

Inventive Principle:

Principle #36Phase transitions

2Object-generated harmful factors

If an electrical driving engine with accumulators is used, then emission levels are reduced, but the operating periods are comparatively short and the accumulators are expensive

Engineering Contradiction:

Improveemission levelsVSAvoidoperating period

Core Design Contradiction:

Object-generated harmful factorsVSDuration of action of moving object

Solution Approach 1:

The patent changes the energy storage medium from electrical accumulators to liquid gas fuel tanks. This parameter change extends the operating period significantly compared to battery-based systems, while maintaining low emission characteristics. The liquid gas provides higher energy density and longer operational duration.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If the storage container is mounted directly on the machine frame, then the structure is simple, but vibration is strongly transmitted to the operator

Engineering Contradiction:

Improvemounting structureVSAvoidvibration transfer

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces vibration-cushioned mounting means as an intermediary between the machine frame and the storage container. This intermediary element decouples the vibration transmission path, reducing the passage of vibrations to the operator while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent implements vibration cushioning in advance of the storage container mounting. By incorporating damping elements or flexible mounting structures before the storage container is installed, the system proactively prevents excessive vibration transmission to the operator during operation.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

4Device complexity

If the storage container is mounted on the guide bar, then the structure is simplified, but the storage container is subjected to strong vibrations during operation

Engineering Contradiction:

Improvemounting structureVSAvoidstorage container stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces vibration-cushioned mounting means as an intermediary between the guide bar and the storage container. This intermediary protects the storage container from strong vibrations during operation while maintaining a simplified mounting structure. The cushioning element absorbs vibration energy and prevents direct transmission to the storage container.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution achieves low-emission working conditions and extended operating periods while minimizing vibration transfer to the operator, ensuring safe and reliable operation with reduced soot and carbon monoxide emissions.

Implementation Method 1

liquid gas powered driving engine... burning of liquid gas... lower carbon monoxide concentration in the exhaust gas... free from soot

Methodology Applied

Scientific EffectCombustion: Combustion

Implementation Method 2

storage container holding means which are vibration-cushioned in relation to vibration induced by the machine frame

Methodology Applied

Scientific EffectVibration damping: Damping

Data Source

PatentUS9611596B2Hand-guided ground compacting machine

Publication Date: 2017.04.04 BOMAG GMBH

AI summary

A hand-guided ground compacting machine, such as, in particular, a vibration tamper, a vibratory roller or a vibratory plate, comprising a driving engine mounted on a machine frame, a ground compaction device driven by the driving engine, and a guide bar. Features of the present invention reside in that the driving engine is a liquid gas powered driving engine and that the ground compacting machine comprises at least one storage container for liquid gas which is replaceably disposed in a storage container holding means on the hand-guided ground compacting machine.