Beacon Lid Tensioning With Cross-Pin Fastening for Fretting Wear
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Solution Overview
Problem
Beacon housings in horizontal directional drilling applications experience significant fretting wear and loosening of fasteners due to vibration, leading to reduced structural integrity and operational inefficiencies.
Innovation Solution
The use of adjustable set screws and cross-pins to secure the lid of the beacon housing in tension, minimizing relative vibration and preventing fretting wear by applying shear and compression forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fastening methods are used to secure the lid, then the assembly can be manufactured and assembled, but the fasteners loosen and fretting wear occurs due to vibration
Solution Approach 1:
The set screw applies a preliminary compressive force to the pin, creating pre-tension that counteracts the loosening effect of vibration before it occurs. This pre-applied force prevents the fastener from loosening during operation by maintaining continuous compression on the connecting elements.
Solution Approach 2:
The pin and set screw assembly is designed to apply compressive force to the lid and housing connection before vibration occurs. The pre-installed fastening mechanism with adjustable set screw creates initial compression that prevents relative movement and fretting wear during subsequent vibrational operation.
2Strength
If the lid is secured tightly to prevent fretting wear, then structural integrity is improved, but the device complexity increases due to additional components
Solution Approach 1:
The fastening function is segmented into distinct components: the pin for alignment and primary connection, and the adjustable set screw for applying compressive force. This segmentation allows each component to perform its specific function efficiently while maintaining overall simplicity of the assembly process.
Solution Approach 2:
The pin serves multiple functions: it aligns the lid with the housing, provides a mounting point for the set screw, and transmits the compressive force applied by the set screw to secure the lid. This multi-functionality reduces the need for additional specialized components.
3Reliability
If cross-pins and set screws are used to secure the lid in tension, then fretting wear is minimized, but the manufacturing process becomes more complex
Solution Approach 1:
The set screw provides adjustable and adaptable fastening that can accommodate variations in assembly tolerances and operational conditions. The adjustable nature of the set screw allows for optimization of the compressive force during assembly, ensuring reliable vibration resistance while maintaining ease of manufacture through simple adjustment rather than complex precision manufacturing.
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
Reduces fretting wear and maintains structural integrity by securing the lid in tension, ensuring reliable operation and preventing fastener loosening.
Implementation Method 1
placing a set screw into the lid such that placement of the set screw applies a force to the component
Implementation Method 2
securing the lid in tension, minimizing relative vibration and preventing fretting wear by applying shear and compression forces
Implementation Method 3
minimizing relative vibration and preventing fretting wear by applying shear and compression forces
Implementation Method 4
preventing fretting wear
Data Source
AI summary
A connection system for a lid in a beacon housing. The lid is connected to the housing at a tab at a first end, after a lip of the lid is placed under a shelf at its second end. The tab has a cross-bore for receiving a connection pin through both the cross-bore and corresponding holes in the housing which form a continuous passage. The lid is placed under tension to reduce relative vibration between the lid and the housing. A set screw is placed within the tab to place a force on the connection pin. Further set screws are distributed about the lid and place the lid in tension relative to the housing. The lid can be removed by reducing the tension provided by the set screws, removing the connection pin, and adjusting the lid such that it is no longer under the shelf of the housing.