Aircraft Wheel Drive Actuator Open-Position Holding Against Lock Failure
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Solution Overview
Problem
Existing methods for securing an aircraft wheel drive actuator in an open position are inadequate, as the locking device can fail, potentially allowing the actuator to interfere with the wheel during critical phases like takeoff or landing.
Innovation Solution
A method where a displacement actuator is continuously powered to maintain the drive actuator in the open position, even if the locking device fails, using a controlled energy supply circuit to ensure the actuator remains locked away from the wheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the displacement actuator is continuously powered to maintain the open position, then safety is enhanced against locking device failure, but energy consumption increases
Solution Approach 1:
The patent applies continuity of useful action by maintaining continuous power supply to the displacement actuator during critical phases (takeoff and landing). This continuous action ensures the drive actuator remains securely held in the open position as a backup safety measure, accepting increased energy consumption as a necessary trade-off for enhanced reliability during these critical operational phases.
2Reliability
If the drive actuator is held in open position by continuous power to the displacement actuator, then safety is improved, but system complexity increases
Solution Approach 1:
The patent applies self-service by utilizing the existing displacement actuator and its power supply system to provide the backup holding function. Rather than introducing a completely new mechanical backup system, the invention repurposes the existing actuator's continuous power capability to serve the dual function of normal operation and safety backup, thereby reducing overall system complexity while maintaining enhanced safety.
Data Source
AI summary
A method for securing an aircraft landing gear wheel drive actuator in an open position of the wheel, the drive actuator being movably mounted on the landing gear between said open position in which it is remote from the wheel and an engaged position in which it cooperates with the wheel to ensure its rotational drive, a displacement actuator being coupled to the drive actuator to move same between the two positions, and a locking member being provided to lock the drive actuator in the open position. The method includes holding the controlled displacement actuator to move the drive actuator to the open position, while the drive actuator is locked in the open position.