Burst-Through Torque Nut for Anti-Cross-Threading Assembly
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Solution Overview
Problem
Conventional hex nuts with locking features are not compatible with anti-cross threading bolts, leading to cross-threading issues and difficulties in distinguishing between proper and improper torque readings during assembly, which can result in poor product quality and increased manufacturing time.
Innovation Solution
A hex nut with a dome-shaped head and axially aligned aperture that deforms when a predetermined burst-through torque is applied, providing a distinct torque signature to indicate proper alignment and preventing loosening, and is designed to work effectively with anti-cross threading bolts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hex nuts with locking features are used, then loosening prevention is improved, but compatibility with anti-cross threading bolts deteriorates and cross-threading issues occur
Solution Approach 1:
The nut head is designed with a localized deformation zone (dome-shaped region) that has different mechanical properties than the rest of the nut body. This localized area is specifically engineered to deform at a predetermined torque to indicate proper engagement, while the rest of the nut maintains its structural integrity and locking features.
Solution Approach 2:
The nut incorporates a predetermined deformation characteristic built into its structure before assembly. The dome-shaped head is designed to deform at a specific torque threshold, providing advance indication that proper engagement has been achieved, preventing cross-threading before it causes damage.
2Ease of manufacture
If conventional hex nuts are used, then manufacturing simplicity is improved, but the ability to distinguish between proper and improper torque readings deteriorates
Solution Approach 1:
The nut utilizes a visible physical change (deformation of the dome-shaped head) that serves as a clear indicator of proper torque application. This visual feedback mechanism allows operators to easily distinguish between proper and improper torque readings without requiring complex measurement instruments.
Solution Approach 2:
The nut provides its own torque verification function through the deformation indicator, eliminating the need for separate torque measurement devices or complex inspection procedures. The deformation itself serves as the measurement and verification mechanism.
3Productivity
If conventional hex nuts are used, then assembly speed is improved, but product quality deteriorates due to cross-threading errors
Solution Approach 1:
The deformation indicator provides immediate feedback during the assembly process, allowing operators to verify proper engagement in real-time. This feedback mechanism enables quick detection and correction of improper assembly, maintaining high productivity while preventing defective assemblies from proceeding to later stages.
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 hex nut ensures accurate assembly by providing a clear torque signature for proper alignment and preventing loosening, enhancing the reliability of the assembly process and reducing the risk of cross-threading errors.
Implementation Method 1
The dome-shaped head is provided to be deformed by threads disposed on the bolt when a predetermined burst-through torque is applied thereto
Data Source
AI summary
A nut is configured to be secured to a bolt. The nut includes a main body that defines an axially aligned bore with threads disposed on an inner wall thereof. Further, the nut includes a dome-shaped head that has an axially aligned aperture and that is provided to be deformed by threads on the bolt when a predetermined burst-through torque is applied thereto.