Fracture Nut Web Geometry for Precise Torque Limiting
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Solution Overview
Problem
Existing torque limiting devices, especially when used with expansion anchors in through-hole technology, experience premature weakening of webs due to axial inertial forces and stresses during hammering, leading to inconsistent breaking points and torque scattering.
Innovation Solution
The device dimensions the webs such that the line segment of minimum wall thickness is at a large acute angle (>45°) with respect to the longitudinal axis, reducing the influence of hammering forces and ensuring precise breaking with minimal torque scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the web is designed with conventional orientation (small angle with longitudinal axis), then the device structure is simple, but the breaking precision deteriorates due to premature weakening from axial inertial forces during hammering
Solution Approach 1:
The patent changes the geometric parameter of the web by orienting the minimum wall thickness line segment at a large acute angle (greater than 45 degrees) with respect to the longitudinal axis. This parameter change optimizes the web's resistance to axial inertial forces during hammering, preventing premature weakening and ensuring consistent breaking precision at the predetermined breaking point.
2Reliability
If the web is designed to resist axial inertial forces during hammering, then the breaking precision improves, but the manufacturing complexity increases
Solution Approach 1:
The patent achieves improved breaking reliability by changing the orientation parameter of the web's minimum wall thickness line segment to a large acute angle (>45°) with the longitudinal axis. This geometric modification enhances the web's ability to withstand axial inertial forces during hammering without requiring additional manufacturing steps or complex structures, thus maintaining ease of manufacture while improving reliability.
3Manufacturing precision
If conventional web orientation is used, then manufacturing is easier, but torque scattering increases due to premature web weakening
Solution Approach 1:
The patent optimizes torque precision by changing the web's geometric parameter - specifically, orienting the line segment of minimum wall thickness at a large acute angle (greater than 45 degrees) with respect to the longitudinal axis. This parameter change prevents premature web weakening during hammering, reducing torque scattering and ensuring consistent torque limiting performance while maintaining manufacturing simplicity.
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 design achieves high breaking precision and reliability with reduced manufacturing complexity, providing consistent and precise torque limiting performance even under load stress conditions.
Implementation Method 1
the at least one web, which connects the receiving part and the top part and which forms a predetermined breaking point
Data Source
AI summary
A device for torque limiting, has a nut having a female thread. A holding element includes a top part having an entrainment profile in a rear area of the holding element for the rotatably fixed coupling of the top part with a setting tool and a receiving part having a receptacle in a front area of the holding element, in which the nut is rotatably fixedly accommodated, the top part having a passage, through which a threaded rod screwed into the nut may be led out of the holding element through the top part along the longitudinal axis of the device. The holding element includes a web connecting the receiving part and the top part and which forms a predetermined breaking point. In at least one longitudinal sectional plane of the device, the smallest wall thickness of the at least one web is present on a line segment of minimum wall thickness, which runs at an angle greater than 45° with respect to the longitudinal axis of the device. A fastening arrangement includes the device.