Three-Web Torque Limiter for Precise Breakaway Fastening
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Solution Overview
Problem
Existing torque limiting devices face challenges in achieving precise and reliable breaking with minimal manufacturing complexity, often resulting in either poor breaking precision or increased complexity due to the number and design of torque-transmitting webs.
Innovation Solution
A device with exactly three torque-transmitting webs connects the top and receiving parts, providing a robust and precise breaking point with large web cross sections, which reduces the influence of manufacturing tolerances and ensures effective force transmission without tilting, thus achieving high breaking precision and reliability with reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If six torque-transmitting webs are used to form the predetermined breaking point, then the force transmission is improved, but the manufacturing complexity and breaking precision are worsened
Solution Approach 1:
The holding element is segmented into exactly three torque-transmitting webs that connect the top part and receiving part, forming a predetermined breaking point. This segmentation provides sufficient force transmission while reducing manufacturing complexity compared to six-web designs.
Solution Approach 2:
The three torque-transmitting webs are designed with locally optimized cross-sections and positioning to ensure adequate torque transmission. The webs are arranged to provide symmetric force distribution, compensating for the reduced number of elements while maintaining breaking precision.
2Strength
If six torque-transmitting webs are used to form the predetermined breaking point, then the force transmission is improved, but the breaking precision is worsened
Solution Approach 1:
The holding element is segmented into exactly three torque-transmitting webs that connect the top part and receiving part, forming a predetermined breaking point. This segmentation provides sufficient force transmission while reducing manufacturing complexity compared to six-web designs.
Solution Approach 2:
While maintaining overall symmetry for balanced force distribution, the design uses an asymmetric reduction from six webs to three webs, which simplifies manufacturing while preserving breaking precision through optimized web geometry and positioning.
3Device complexity
If a small number of torque-transmitting webs is used, then the manufacturing complexity is reduced, but the force transmission and anti-tilting capability are worsened
Solution Approach 1:
The three torque-transmitting webs are designed with locally optimized cross-sections and positioning to ensure adequate torque transmission. The webs are arranged to provide symmetric force distribution, compensating for the reduced number of elements while maintaining breaking precision.
Solution Approach 2:
The design compensates for the reduced number of webs by optimizing their spatial arrangement and cross-sectional dimensions, effectively using dimensional adjustments to maintain force transmission capability with fewer elements.
4Manufacturing precision
If the web cross sections are made large to reduce manufacturing tolerance influence, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The three torque-transmitting webs are designed with locally optimized cross-sections and positioning to ensure adequate torque transmission. The webs are arranged to provide symmetric force distribution, compensating for the reduced number of elements while maintaining breaking precision.
Solution Approach 2:
The design compensates for the reduced number of webs by optimizing their spatial arrangement and cross-sectional dimensions, effectively using dimensional adjustments to maintain force transmission capability with fewer elements.
Data Source
AI summary
A device for torque limiting is provided, including a holding element for a nut or a screw head, the holding element including 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 the holding element including a receiving part having a receptacle in a front area of the holding element for rotatably fixedly accommodating the nut or the screw head. According to the invention, the holding element includes three torque-transmitting webs, which connect the receiving part and the top part and which form a predetermined breaking point. The invention also relates to a fastening arrangement made up of a device of this type and an expansion anchor.