Washer Beam Deflection for Visual Torque Indication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Threaded mechanical fastening systems often suffer from over-tightening, which can damage components, and existing solutions like torque wrenches or torque clutches add complexity and cost to assembly.
Innovation Solution
A threaded mechanical fastening system that uses a washer deflected as a simple beam to indicate when the desired minimum torque is reached or when the maximum torque is exceeded, allowing for visual verification through calibrated deflection marks or protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque measuring devices or torque limiting devices are used to prevent over-tightening, then the reliability of the fastening system is improved, but the device complexity and cost increase
Solution Approach 1:
The washer serves itself as both a functional component and a torque indication mechanism. The washer's own structural deflection under load provides the torque measurement function, eliminating the need for separate torque measuring or limiting devices. This self-service approach maintains reliability while reducing device complexity.
Solution Approach 2:
The washer acts as an intermediary element between the threaded connection and the component surface. It mediates the torque application by deflecting in response to torque and providing visual indication, thereby preventing over-tightening without requiring complex external devices.
2Reliability
If torque measuring devices or torque limiting devices are used to prevent over-tightening, then the reliability of the fastening system is improved, but the manufacturing cost increases
Solution Approach 1:
The washer provides its own torque indication function through its structural design, eliminating the need for expensive torque measuring or limiting devices. This reduces manufacturing cost while maintaining the reliability benefit of torque control.
Solution Approach 2:
The washer is designed as a simple, inexpensive component that can be easily manufactured and replaced if necessary. Its low cost allows it to serve as an effective torque indication mechanism without the expense of sophisticated torque control devices.
3Device complexity
If a washer is used as a simple beam to indicate torque levels, then the device complexity is reduced, but the measurement precision may be affected
Solution Approach 1:
The washer is designed with specific local structural features (such as its geometry and material properties) that enable it to deflect at predetermined torque levels. This local quality optimization ensures that the simple washer structure provides accurate torque indication at critical thresholds.
Solution Approach 2:
The washer's deflection characteristics are calibrated by adjusting its physical parameters (such as thickness, diameter, and material properties) to provide accurate indication at desired torque levels. This parameter optimization maintains measurement precision while keeping the device simple.
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
This solution simplifies the assembly process by providing a visual indication of torque levels, preventing damage from over-tightening while ensuring the correct torque is applied, thus reducing complexity and cost.
Implementation Method 1
the washer forms a structural member that is deflected by tightening the threaded connection to or above a predetermined torque
Data Source
AI summary
Threaded mechanical fastening systems and methods are provided that allow the simple deflection of a washer to indicate that a desired minimum torque has been reached or that a desired maximum torque has been exceeded. The method includes providing a threaded connection having a washer, installing the threaded connection so that the washer is supported as a simple beam over a gap, and using an amount of deflection of the washer as a result of torque applied by the threaded connection as an indicator. The torque indicating threaded mechanical fastening system includes a threaded connection and a washer supported as a simple beam over a gap so that the threaded connection, when tightened to a predetermined torque, deflects, in bending, the washer into the gap.