Compacting Machine Plain Bearing Vibration Transfer

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Solution Overview

Problem

Existing compacting machines with unbalanced masses are bulky, complex, and noisy, with limitations in permissible stresses and rotational speeds due to the use of conventional roller bearings for vibration generation.

Innovation Solution

The use of plain bearings, specifically hydrodynamic fluid bearings, to connect the shaft, unbalanced mass, and drum, allowing for efficient transfer of imbalance forces and driving forces, enabling a compact, space-saving design with reduced noise and increased rotational speeds.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If roller bearings are used to support the unbalanced mass, then the compacting machine can operate, but the device becomes bulky, complex, and noisy with limited rotational speeds

Engineering Contradiction:

Improveoperational capabilityVSAvoidbearing construction complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the conventional roller bearing system with a plain bearing system that uses hydrodynamic lubrication. This substitution eliminates the need for rolling elements, reducing mechanical complexity while enabling higher rotational speeds and compact design. The plain bearing supports the unbalanced mass through fluid film lubrication, achieving the same operational capability with simpler construction.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs hydrodynamic lubrication principles to create a fluid film between the bearing surfaces. This hydraulic approach allows the bearing to support the unbalanced mass through pressure distribution in the lubricating fluid, enabling higher rotational speeds and reduced complexity compared to conventional mechanical roller bearings.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Reliability

If conventional roller bearings are used, then the compacting machine can function, but it generates high noise levels and is limited in permissible stresses

Engineering Contradiction:

Improvefunctional operationVSAvoidnoise generation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The replacement of roller bearings with plain bearings using hydrodynamic lubrication eliminates the mechanical contact and friction that generate noise. The fluid film lubrication system operates quietly while maintaining the necessary load-bearing capacity, thus reducing noise pollution without compromising functional operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If roller bearings are used to support the unbalanced mass, then the machine can operate, but the construction becomes expensive and space-consuming

Engineering Contradiction:

Improveoperational capabilityVSAvoidbearing space occupation

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The plain bearing system with hydrodynamic lubrication requires significantly less space than conventional roller bearing systems. The elimination of rolling elements and the use of fluid film lubrication allows for a more compact design that maintains operational capability while reducing the space occupied by the bearing assembly.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Productivity

If the shaft rotates at higher speeds to improve compaction efficiency, then productivity increases, but the permissible stresses and centrifugal forces become excessive

Engineering Contradiction:

Improvecompaction efficiencyVSAvoidcentrifugal force stress

Core Design Contradiction:

ProductivityVSStress or pressure

Solution Approach 1:

The hydrodynamic lubrication system creates a pressurized fluid film that supports the unbalanced mass at high rotational speeds. The lubricating fluid generates pressure to counteract the centrifugal forces, allowing the shaft to rotate at higher speeds for improved productivity without exceeding permissible stress limits.

Inventive Principle:

Principle #29Pneumatics and hydraulics

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 allows for the efficient absorption of imbalance and driving forces, enabling higher rotational speeds and reduced noise, while maintaining a compact and cost-effective construction, suitable for various compaction applications.

Implementation Method 1

the exciter bearing comprises one or a plurality of plain bearings... Plain bearings are sometimes alternatively called journal bearings, slide bearings or friction bearings

Methodology Applied

Scientific EffectHydrodynamic lubrication: Lubrication

Implementation Method 2

Vibrating compactors are dynamic compacting machines that are adapted to transfer energy, in addition to their own weight, into a volume to be compacted... use is usually made of vibration produced by unbalanced masses

Methodology Applied

Scientific EffectVibration: Vibration

Implementation Method 3

the shaft is connected both to the unbalanced mass and to the drum and is adapted to transfer imbalance forces from the unbalanced mass to the drum

Methodology Applied

Scientific EffectMechanical force transfer: Mechanical Force

Data Source

PatentUS8961066B2Compacting machine

Publication Date: 2015.02.24 BOMAG GMBH

AI summary

The present invention relates to a compacting machine comprising a shaft, an unbalanced mass and a drum, wherein the shaft is connected both to the unbalanced mass and to the drum and is adapted to transfer imbalance forces from the unbalanced mass to the drum, and further wherein the shaft is mounted in a plain bearing.