Track Assembly Oil Contact Sensing for Lubrication Loss Detection

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Solution Overview

Problem

Components in track assemblies of machines become insufficiently lubricated due to oil leakage, leading to potential damage to the components and the machine, as existing technologies do not effectively detect wear or oil depletion.

Innovation Solution

A sensor device with electrodes is placed in the oil reservoir to determine if the electrical circuit is closed or open, generating sensor data when the oil level falls below a threshold, and a controller is activated to prevent machine operation when insufficient lubrication is detected.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a sensor device with electrodes is placed in the oil reservoir to detect oil level, then the reliability of detecting lubrication status is improved, but the device complexity increases

Engineering Contradiction:
Improvereliability of detecting lubrication statusVSAvoiddevice complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical oil level detection mechanisms with a simple electrical circuit-based sensor device. The sensor uses electrodes that complete an electrical circuit when immersed in oil, providing a reliable and straightforward method to detect lubrication status without mechanical moving parts.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The sensor device utilizes the oil itself as the detection medium - the oil's electrical conductivity properties are directly used to determine its presence at the sensor electrodes. The system serves itself by using the lubricant's inherent properties rather than requiring external calibration or reference standards.

Inventive Principle:
Principle #25Self-service

2Productivity

If the machine operates after oil leakage occurs, then productivity is maintained, but the components become damaged due to insufficient lubrication

Engineering Contradiction:
ImproveproductivityVSAvoidcomponent integrity
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

The sensor device performs preliminary detection of oil level depletion before critical damage occurs. By detecting the open circuit condition early when oil first leaks, the system can trigger warnings or shutdowns in advance, preventing catastrophic component failure while allowing operation during acceptable oil levels.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The electrical circuit sensor provides continuous feedback on lubrication status. When the circuit opens due to oil leakage, the system receives immediate feedback about the deteriorating lubrication condition, enabling timely intervention to prevent component damage while maintaining productivity during normal operation.

Inventive Principle:
Principle #23Feedback

3Measurement precision

If existing sensor technologies are used to detect wear, then measurement precision may be sufficient, but the difficulty of detecting and measuring oil depletion increases

Engineering Contradiction:
Improvemeasurement precisionVSAvoiddifficulty of detecting oil depletion
Core Design Contradiction:
Measurement precisionVSDifficulty of detecting and measuring

Solution Approach 1:

The patent replaces complex mechanical or optical wear detection sensors with a simple electrical conductivity-based detection method. This substitution makes oil depletion detection straightforward and reliable, eliminating the difficulty of detecting lubrication status while maintaining sufficient measurement precision to distinguish between adequate and depleted oil levels.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

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

Prevents machine operation when components are insufficiently lubricated, thereby avoiding damage to the components and the machine by providing timely notifications and preventing wear.

Implementation Method 1

determine whether an electrical circuit, including electrodes of the sensor device, is closed or open, the electrical circuit being closed based on the electrodes being immersed in oil in the oil reservoir

Methodology Applied
Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS12078523B2Predicting track assembly component failure using direct oil contact sensor device
Publication Date: 2024.09.03 CATERPILLAR INC
  • US12078523B2 patent drawing
  • US12078523B2 patent drawing
  • US12078523B2 patent drawing

AI summary

In some implementations, one or more devices may determine whether an electrical circuit is closed or open, the electrical circuit including electrodes of the sensor device, the electrical circuit being closed based on the electrodes being immersed in a lubricant in a cavity of a component of a track assembly of the machine, the electrical circuit being open based on the electrodes not being immersed in the lubricant in the cavity. The one or more devices may generate sensor data based on determining that the electrical circuit is open, the sensor data indicating that a level, of the lubricant in the cavity, does not satisfy a level threshold. The one or more devices may cause the machine to perform an action based on the sensor data indicating that the level does not satisfy the level threshold.