Clamping Nut Transition Surface for Reliable Locking
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Solution Overview
Problem
Existing multi-part quick-action clamping nuts face challenges in providing a reliable and easy-to-handle fastening solution while maintaining low production costs, often requiring additional locking bodies and being prone to unintentional opening under load.
Innovation Solution
The fastening arrangement incorporates a quick-action clamping nut with a stop surface and a transition surface between the securing and centering surfaces, allowing for a small opening angle securing surface that acts radially for a strong pressing effect, combined with a centering surface that ensures precise alignment without tilting, and a stop surface to prevent axial retraction, ensuring reliable locking without relying on the transition surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-part quick-action clamping nut is used without a transition surface, then the structure is simpler and production costs are lower, but the nut parts are not reliably pressed onto the threaded rod and may open unintentionally under load
Solution Approach 1:
The securing body's inner surface is segmented into three distinct functional surfaces: a centering surface (24) for alignment, a transition surface (23) for gradual engagement, and a securing surface (22) for radial pressing. This segmentation allows each surface to perform its specific function optimally, ensuring reliable nut part securing while maintaining a relatively simple overall structure.
Solution Approach 2:
The transition surface (23) is designed with a larger opening angle than the securing surface (22), creating a dimensional progression from a wider entry angle to a narrower securing angle. This dimensional change enables the nut to be guided in easily while still achieving strong radial pressing force in the final secured position.
2Ease of operation
If the securing surface has a large opening angle for easy nut insertion, then ease of operation is improved, but the pressing effect on nut parts is reduced
Solution Approach 1:
The solution employs two different opening angles in sequence: the transition surface (23) has a larger opening angle to facilitate easy nut insertion and guidance, while the securing surface (22) has a smaller opening angle to generate strong radial pressing force. The transition surface acts as an intermediate stage that bridges the gap between ease of insertion and effective securing.
Solution Approach 2:
The transition surface (23) performs the preliminary action of guiding and centering the nut parts before they engage with the securing surface (22). This preliminary guidance ensures that the nut parts are properly positioned and begin engagement smoothly, allowing the securing surface to then apply maximum pressing force without resistance from misalignment.
3Manufacturing precision
If the centering surface is positioned close to the threaded rod for reliable centering, then alignment precision is improved, but the securing surface cannot act radially for optimal pressing
Solution Approach 1:
By segmenting the securing body's inner surface into distinct centering (24) and securing (22) surfaces with different geometries, the design allows the centering surface to be optimally positioned for alignment precision while the securing surface is optimally shaped for radial pressing force. The transition surface (23) connects these two surfaces, enabling both functions to perform at their best.
Solution Approach 2:
The transition surface (23) acts as an intermediary element between the centering surface (24) and the securing surface (22). It mediates the transition from the centered position to the secured position, allowing the nut to move smoothly from alignment to engagement while maintaining both centering precision and radial pressing effectiveness.
4Device complexity
If the transition surface contacts the nut parts during securing, then the structure is simpler, but the pressing effect is compromised and the nut may not be securely locked
Solution Approach 1:
The segmentation of the securing body's inner surface into three distinct surfaces ensures that each surface contacts the nut parts at the appropriate stage: the transition surface (23) contacts during initial engagement and guidance, while the securing surface (22) contacts during final securing. This segmentation prevents the transition surface from interfering with the securing action while maintaining structural simplicity.
Solution Approach 2:
The transition surface (23) performs its function of guiding and centering the nut parts during preliminary engagement, after which the nut parts are positioned correctly for the securing surface (22) to apply radial pressing force. This preliminary action by the transition surface ensures that subsequent securing action is effective without the transition surface interfering with the final locked position.
Data Source
Figure 1~5
Figure 6~7
AI summary
The mounting assembly has a clamp nut (30) comprising two nut portions having grooves for receiving a threaded rod (1). A securing structure (10) has passage opening (20) for securing clamp nut on the threaded rod. The securing structure has locking surface (22) for pressing the nut portions on the threaded rod, and a centering surface (24) for centering the threaded rod in the passage opening. The securing structure has transition surface (23) extending between locking surface and centering surface in a state adjoining locking surface and centering surface.