Self-Locking Threaded Plug Ratchet Ring for Anti-Rotation
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Solution Overview
Problem
Existing self-locking threaded assemblies in gas turbine engines lack a simple, robust, and reusable anti-rotation feature that is easy to manufacture and maintain, and often require special tools or knowledge to operate.
Innovation Solution
A self-locking plug assembly featuring a ratchet ring with flexible fingers that engage polygonal sides, combined with a biasing means like a coil spring and an annular retaining ring, provides double anti-rotation protection without the need for special tools, using a design that is simple, robust, and easy to handle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex locking mechanisms with multiple components are used, then anti-rotation protection is improved, but device complexity increases
Solution Approach 1:
The patent combines the locking function and anti-rotation function into a single integrated mechanism. The ratchet ring with flexible fingers provides both locking (preventing loosening) and anti-rotation protection simultaneously, eliminating the need for separate locking mechanisms and reducing overall device complexity while maintaining double protection
Solution Approach 2:
The ratchet ring assembly serves multiple functions: it provides locking action through the flexible fingers engaging the polygonal head, prevents rotation through the ratcheted outer profile, and maintains constant engagement through the biasing means. This multi-functional design reduces the number of components needed while achieving comprehensive protection
2Reliability
If multiple movable elements are used for locking, then self-locking capability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The locking mechanism is segmented into distinct functional elements: the ratchet ring with flexible fingers, the biasing means, and the polygonal head. Each segment performs a specific function and can be manufactured independently using standard machining processes, simplifying production while maintaining the self-locking capability through their coordinated interaction
Solution Approach 2:
The flexible fingers are designed with specific geometric parameters (width, thickness, engagement angle) that allow them to provide locking force through elastic deformation. By optimizing these parameters, the mechanism achieves reliable self-locking with simple manufacturing processes, avoiding complex assembly procedures
3Reliability
If robust locking mechanisms are used, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The locking mechanism is designed to be self-actuating through the biasing means that automatically maintains engagement between the flexible fingers and the polygonal head. The system requires no external power source, adjustment, or special operational knowledge - the mechanical elements self-regulate to maintain secure locking and anti-rotation protection throughout operation
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 effectively prevents the self-locking plug from loosening or falling out during engine operation, ensuring secure sealing and easy maintenance, while being adaptable for various applications beyond gas turbine engines.
Implementation Method 1
a biasing means, such as a coil spring
Implementation Method 2
a ratchet ring with flexible fingers that engage polygonal sides
Data Source
Figure 1
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AI summary
A self-locking plug assembly includes ratchet ring (16) circumscribing body (12) having centerline (18) and shank (90) having a threaded top portion. Flexible fingers (22) spiral away from periphery of ratchet ring (16) to engage polygonal sides (28) of polygonal sided ring attached to body (12). Hooks (31) may extend radially outwardly and downwardly from periphery of ratchet ring (16). Spring (56) around polygonal portion of body rests on ratchet ring (16). Annular retaining ring (58) snapped into annular groove in body compresses spring (56). Hooks (31) may engage notches in the upper wall. Alternatively, hooks may include paws extending inwardly from downwardly extending legs of hooks and into the pockets and engaging upper pocket walls to axially secure the ratchet ring. Body may be borescope plug with a lower end of shank conforming to lower port opening in upper wall. Alternatively, flexible fingers extend outwardly from radially outer rim of ratchet ring and engage polygonal sides of inner side of polygonal sided ring circumscribing ratchet ring.