Segmented Nut with Frictional Torque for Bolt Tear-Off
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Solution Overview
Problem
Existing screw nut designs often result in threaded bolts protruding beyond the nut, requiring multiple bolt lengths and complex assembly processes, and lack secure locking mechanisms to prevent unintended loosening.
Innovation Solution
A screw nut design with geometrically and material-matched sections that allow the threaded bolt to be securely locked and easily torn off at a predetermined point, using a frictional torque mechanism that prevents the bolt from protruding beyond the nut, ensuring secure engagement and easy assembly with standard bolt lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the nut is designed to tear off the threaded bolt after tightening, then the threaded bolt protrusion problem is solved, but the assembly complexity increases due to multiple bolt lengths requirements
Solution Approach 1:
The nut is divided into two separate sections: a first section that remains on the threaded bolt and a second section that is torn off. This segmentation allows the nut to control bolt protrusion while using a single standard bolt length, resolving the contradiction between ease of operation and assembly complexity.
2Ease of operation
If the frictional torque between contact surfaces is reduced, then the threaded bolt can be torn off more easily, but the locking security of the connection is compromised
Solution Approach 1:
Different contact surfaces have different friction characteristics: the first contact surface between the first section and abutment provides high friction for secure locking, while the second contact surface between sections is designed with lower friction to enable easy tear-off. This local differentiation resolves the contradiction between locking security and tear-off ease.
3Reliability
If the second section is designed to clamp the first section like a lock nut, then the connection security is improved, but the threaded bolt still protrudes beyond the nut requiring removal
Solution Approach 1:
The connection between the two sections transitions from a fixed clamping state during tightening to a separable state after tightening. The second section dynamically changes from clamping the first section to being torn off, which secures the connection while preventing bolt protrusion, resolving the contradiction between connection security and protrusion management.
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 design ensures the threaded bolt is securely locked and can be easily torn off at a predetermined point, preventing protrusion and allowing for standard bolt lengths, enhancing safety and reducing assembly complexity while maintaining secure connections.
Implementation Method 1
a frictional torque acting on the second section as a result of the friction that occurs is less than the torque required to snap off or tear off the threaded bolt
Data Source
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AI summary
The invention relates to a screw nut (1) having a first section (10) and further having a second section (16), wherein in an initial state the screw nut (1) can be screwed onto a threaded bolt until the first section (10) with a first contact surface (50) comes into contact with an abutment, and wherein the rotationally fixed connection between the first section (10) and the second section (16) can be released by exceeding a predetermined tightening torque and, upon further rotation by a relative movement, the second section (16) with a second contact surface (34) is in contact with a further contact surface of a section of the screw nut (1).