Spherical Pawl Locking Mechanism for Ram Air Turbine Actuators
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Solution Overview
Problem
Traditional locking mechanisms for ram air turbine (RAT) actuators are complex and costly due to the need for precise machining of rectangular pawl pockets, which complicates the manufacturing process and increases costs.
Innovation Solution
A locking mechanism featuring spherical pawl rollers and locking pawls that radially extend and retract, allowing for axial movement to define a locked or unlocked position, simplifying the geometry and manufacturing process by using spherical shapes and reducing the complexity of pawl and pawl roller pocket design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional rectangular pawl pockets are used, then the locking mechanism provides reliable operation, but the manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent replaces traditional rectangular pawl pockets with spherical cavities that receive spherical locking elements. This curvature transformation simplifies the machining process from complex rectangular geometries to simpler spherical forms, reducing manufacturing complexity while maintaining the locking function through the spherical interaction between pawls and rollers
2Manufacturing precision
If precise machining of rectangular pawl pockets is performed, then the locking mechanism operates without binding, but the production time and cost increase
Solution Approach 1:
The spherical geometry of the cavities and locking elements replaces precision-critical rectangular geometries. Spherical surfaces are inherently more tolerant to manufacturing variations and easier to machine with consistent precision, thereby improving production efficiency while maintaining adequate manufacturing precision for reliable operation
3Reliability
If complex rectangular pawl geometry is used, then the locking mechanism functions properly, but the manufacturing cost increases
Solution Approach 1:
The patent employs spherical locking elements and spherical cavities throughout the mechanism. This uniform spherical geometry simplifies manufacturing processes, reduces the number of different component types, and enables the use of standardized spherical components, all of which reduce manufacturing cost while preserving the locking function through spherical mechanical interaction
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 provides a cost-effective and simplified locking mechanism for RAT actuators, enabling efficient manufacturing and reliable operation by reducing manufacturing complexity and allowing for the use of off-the-shelf components, while maintaining superior locking properties.
Implementation Method 1
The pawl rollers, the locking pawls, the first member, and the second member can be shaped and configured such that axial movement in a first direction of the first member relative to the second member causes the pawl rollers to contact the locking pawls and to urge them radially outward
Data Source
AI summary
A locking mechanism for a ram air turbine actuator can include at least one of spherical locking pawls configured to retain an outer member and spherical pawl rollers configured to radially actuate the spherical locking pawls by axial movement of the spherical pawl rollers.