Self-Locking Tube Fitting with Retaining Band
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Solution Overview
Problem
Aerospace tube assemblies require effective locking mechanisms to prevent unintentional loosening due to vibrations and wear, but existing lockwire solutions are ergonomically undesirable, difficult to install, and prone to breakage, leading to disengagement issues.
Innovation Solution
A tubular fitting design featuring a base member with a retaining band and engagement features such as pockets or protrusions, along with a locking mechanism, minimizes relative rotation and axial movement between components, using materials with varying hardness and incorporating a key or interference fit for secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lockwire is used as a locking mechanism, then the fitting can prevent unintentional loosening, but it requires additional space and is difficult to install
Solution Approach 1:
The locking mechanism is merged with the nut itself, integrating the locking function into the fastening component. The locking mechanism includes elements that engage with the fitting and tube assembly, eliminating the need for separate lockwire components and reducing installation complexity while maintaining reliability
Solution Approach 2:
A retaining band serves as an intermediary component between the fitting and the locking mechanism. The retaining band includes engagement features that interface with both the fitting and the locking mechanism, facilitating secure connection while simplifying the overall assembly process
2Reliability
If lockwire is used as a locking mechanism, then the fitting can prevent unintentional loosening, but it is ergonomically undesirable
Solution Approach 1:
The locking function is merged into an integrated nut assembly that can be manipulated with standard tools, eliminating the need for complex lockwire manipulation that is ergonomically challenging. The unified structure allows for easier handling and installation while maintaining the anti-loosening function
Data Source
AI summary
A fitting for connecting tubular assemblies includes a base member defining a first bore configured to receive a tube therein. A retaining band defines a second bore for receiving a portion of the base member. The retaining band defines an engagement feature on a radially outward surface configured to engage a locking mechanism of a fastening member.