Clevis Link for Ram Air Turbine Toggle Mechanism
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Solution Overview
Problem
The toggle mechanism in ram air turbine actuators faces challenges in withstanding loading from solenoids and internal components, which can cause the cross rod and clevis to bend, requiring components that are both strong and easy to install and maintain for cost and reliability benefits.
Innovation Solution
A clevis design with a first and second side connected via a perpendicular brace, featuring parallel pivot holes, through holes, and a helicoil blind hole, along with a cross rod having a flange and varying diameters, and a cap screw securing the cross rod to the clevis, enhances structural integrity and resistance to bending forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cross rod and clevis are designed to withstand heavy loading from solenoids and internal components, then the strength and reliability are improved, but the complexity of installation and maintenance increases
Solution Approach 1:
The clevis is divided into two separate sides that are rigidly connected via braces, allowing each side to be independently manufactured and assembled. The cross rod is secured using separate fastening mechanisms (helicoil blind hole with cap screw, and pivot holes with pins), enabling modular replacement and maintenance without replacing the entire assembly.
Solution Approach 2:
The helicoil blind hole is embedded within the brace structure of the clevis, creating a nested fastening system. The cap screw inserts into this nested helicoil hole to secure the cross rod, allowing the fastening mechanism to be integrated within the existing structural components rather than adding external bulk.
2Stability of the object's composition
If multiple fastening holes and braces are added to the clevis design, then the structural integrity and resistance to bending forces are improved, but the manufacturing complexity increases
Solution Approach 1:
The clevis is segmented into two sides connected by perpendicular braces, with each component featuring specific holes for its intended function. This segmentation allows each part to be manufactured independently with standard drilling and machining operations, rather than requiring complex monolithic construction.
Solution Approach 2:
The braces serve multiple functions: they rigidly connect the two sides of the clevis, provide structural support against bending forces, and contain the helicoil blind hole for fastening. The parallel arrangement of multiple hole sets (pivot holes, through holes, helicoil hole) allows the same structural pattern to be reused across different functional requirements.
Data Source
AI summary
A clevis for use in a toggle mechanism of a ram air turbine actuator is provided comprising a first side; a second side parallel to the first side; a first set of parallel pivot holes; second set of parallel pivot holes; a set of parallel through holes; and a helicoil blind hole. The second side rigidly connected to the first side via at least one brace perpendicular to the first side and the second side. The helicoil blind hole being located in the first side and extending into the at least one brace. The first side having a first hole of the first set of parallel pivot holes, a first hole of the second set of parallel pivot holes, and a first hole of the set of parallel through holes. The second side having the hole pattern reflective of the first side, composed of second holes.