Toggle Release Mechanism for Symmetrical RAT Actuation
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Solution Overview
Problem
Existing release mechanisms for Ram Air Turbines (RATs) face issues with inconsistent operation due to asymmetrical actuator forces and potential misalignment, which can lead to unreliable deployment and stowage of the RAT, especially under extreme conditions.
Innovation Solution
A toggle release mechanism with a mounting element that provides a close fit over the actuating rod, combined with a return spring mechanism and symmetrically arranged torsion springs, ensures consistent and symmetrical actuation forces, enhancing the reliability and accuracy of the deployment and stowage processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a toggle type linkage with actuator rod is used to release the locking piston, then the RAT deployment mechanism can be actuated, but asymmetrical actuator forces and misalignment cause inconsistent operation
Solution Approach 1:
A mounting element is introduced as an intermediary component between the actuator rod and the toggle linkage. This mounting element provides a precise mounting location that ensures symmetrical actuation forces and proper alignment, eliminating the inconsistency caused by direct mounting while maintaining structural simplicity.
Solution Approach 2:
The mounting element is designed to create equipotential conditions for force distribution by providing symmetrical mounting points and proper geometric alignment. This ensures that actuator forces are distributed evenly on both sides of the toggle linkage, preventing operational inconsistency.
2Reliability
If oversized actuators are used to compensate for asymmetrical forces, then consistent operation can be achieved, but the installation size increases
Solution Approach 1:
The mounting element creates equipotential force distribution through its geometric design, ensuring symmetrical actuation without requiring oversized actuators. This allows standard-sized actuators to achieve reliable operation by eliminating force asymmetry at the mounting interface.
Solution Approach 2:
The mounting element pre-establishes proper alignment and force distribution before actuation occurs. By preparing the mounting geometry in advance, the system achieves consistent operation with appropriately sized actuators rather than requiring oversized components to compensate for misalignment.
3Device complexity
If the actuating rod is mounted directly without a mounting element, then the structure is simpler, but misalignment and inconsistent actuation occur
Solution Approach 1:
The mounting element serves as an intermediary that provides a precise mounting interface between the actuator rod and toggle linkage. This intermediate component ensures accurate alignment and consistent force transmission while adding minimal structural complexity.
Solution Approach 2:
The mounting element design ensures equipotential force distribution through symmetrical geometry, achieving manufacturing precision and alignment accuracy without significantly increasing structural complexity.
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 solution ensures more reliable and consistent operation of the RAT deployment mechanism by providing symmetrical actuation forces and accurate alignment, reducing the need for oversized actuators and allowing for a more compact installation while ensuring repeatable and reliable deployment and stowage processes.
Implementation Method 1
The return spring mechanism may comprise first and second springs mounted between the base element and the toggle element. The first and second springs may be torsion springs mounted between the toggle element and the base element.
Data Source
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AI summary
A toggle release mechanism (100) comprises a base element (102), a toggle element (104) and an actuating rod (142). The toggle element (104) is rotatably mounted at a first end (112) to the base element (102) about a first axis (114) for rotation between a first, locking position and a second, release position. The actuating rod (142) has a central portion (144) extending through the toggle element (104) and first and second end portions (146, 148) projecting on opposed sides thereof for engagement with actuators (154) arranged on opposed sides of the release mechanism (100). The actuating rod (142) further comprises a mounting flange (156) projecting therefrom at a boundary between the central portion (144) and a first end portion (146). The mounting flange (156) has a first hole (158) therein for receiving a first fastener (160). A surface (162) of the toggle element (104) facing the mounting flange (156) has a bore (164) formed therein for receiving the first fastener (160). The mechanism further comprises a mounting element (166) slidably received on the second end (148) of the actuating rod (142). The mounting element (166) has a bore (168) for receiving the second end (148) of the actuator rod (142) and a second hole (170) for receiving a second fastener (176). A surface (174) of the toggle element (104) facing the mounting element (166) having a second bore (176) formed therein for receiving the second fastener (172).