Oil Filter Bypass Indicators for Condition-Based Maintenance

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Solution Overview

Problem

Current rotorcraft drive systems face failures due to single component failures, lubrication loss, and oil filter clogging, leading to reduced performance and safety issues, with existing systems lacking effective indicators for impending and full-bypass conditions in oil filters.

Innovation Solution

A removable oil filter system with impending-bypass and full-bypass indicators, connected to an oil filter mount, capable of detecting pressure and contaminant levels, and transmitting conditions to a display or monitoring system, allowing for timely maintenance and preventing oil starvation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If frequent inspection and replacement of oil filters is performed, then reliability of the lubrication system is improved, but maintenance cost and time consumption increase

Engineering Contradiction:

Improvereliability of lubrication systemVSAvoidmaintenance time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements impending bypass indicators that detect filter clogging conditions before complete bypass occurs. This preliminary detection allows maintenance to be performed at optimal intervals rather than on fixed schedules, reducing unnecessary maintenance operations while ensuring reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system incorporates visual indicators that provide real-time feedback on filter status through different color codes (yellow for impending bypass, red for full bypass). This feedback mechanism enables condition-based maintenance decisions, eliminating the need for frequent routine inspections while maintaining system reliability.

Inventive Principle:

Principle #23Feedback

2Loss of energy

If oil filter is not replaced timely, then maintenance cost is reduced, but harmful effects from contaminated oil increase

Engineering Contradiction:

Improvemaintenance costVSAvoidcontaminated fluid circulation

Core Design Contradiction:

Loss of energyVSObject-generated harmful factors

Solution Approach 1:

The patent uses color-coded visual indicators (yellow and red lights) to provide continuous feedback on filter condition. This allows operators to monitor filter status and replace filters based on actual condition rather than fixed schedules, preventing contaminated oil circulation while avoiding unnecessary replacements.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system replaces complex mechanical monitoring devices with simple visual indicators that can be observed without specialized equipment. This substitution makes the monitoring system more reliable and easier to use, ensuring timely filter replacement while minimizing maintenance costs.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If single component failure is prevented, then reliability of drive system is improved, but system complexity increases

Engineering Contradiction:

Improvereliability of drive systemVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the monitoring function into separate indicator systems for different failure modes (impending bypass and full bypass indicators). This segmentation allows each indicator to be optimized for its specific function while keeping the overall system simple and manageable.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The filter system incorporates self-monitoring capabilities through visual indicators that automatically detect and report filter status. This self-service approach eliminates the need for complex external monitoring systems while improving reliability through continuous condition assessment.

Inventive Principle:

Principle #25Self-service

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

The system reduces maintenance costs and enhances safety by providing early warnings for impending bypass conditions, allowing for less intensive maintenance and preventing damage from contaminated fluid circulation, thus improving rotorcraft performance and extending component life.

Implementation Method 1

The impending-bypass indicator is capable of reporting an impending-bypass condition of the oil filter system... determining a pressure level at the impending-bypass indicator

Methodology Applied

Scientific EffectPressure detection: Pressure Drop

Implementation Method 2

The full-bypass indicator is capable of reporting a full-bypass condition of the oil filter system... determining a pressure level at the full-bypass indicator

Methodology Applied

Scientific EffectPressure detection: Pressure Drop

Implementation Method 3

an oil filter element removably connected to the oil filter mount... preventing oil filters from becoming clogged with contaminants

Methodology Applied

Scientific EffectPhysical filtration: Filter (physical)

Data Source

PatentUS11680500B2Oil filter with impending and full-bypass indicators

Publication Date: 2023.06.20 BELL HELICOPTER TEXTRON INC

AI summary

A removable oil filter system includes an oil filter mount, an oil filter element removably connected to the oil filter mount, an impending-bypass indicator connected to the oil filter mount and in fluid communication with an oil in the oil filter system, and a full-bypass indicator in fluid communication with the oil filter mount. The impending-bypass indicator is capable of reporting an impending-bypass condition of the oil filter system. The full-bypass indicator is capable of reporting a full-bypass condition of the oil filter system.