Elliptic Boss Shockproof Nut Assembly for Anti-Slip Thread Protection
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Solution Overview
Problem
Existing shockproof nuts either fail to achieve 100% shockproof effect, are complex to operate, or compromise thread life due to lateral forces exerted during assembly, and existing solutions like eccentric nuts can be prone to slippage and reduced thread life from fabrication deviations.
Innovation Solution
A shockproof nut kit featuring an upper nut with an elliptic cylinder boss and a lower nut with a matching cylindrical groove, utilizing a clearance fit without lateral contact, concentrating shaking forces on a narrow elliptic contact area to prevent slippage and maintain thread integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If eccentric taper surfaces are used to achieve shockproof effect, then shockproof performance is improved, but lateral force is exerted on the threads during assembly, adversely affecting thread life
Solution Approach 1:
The patent employs asymmetric elliptic cylinder and circular groove geometry where the elliptic cylinder's major axis is offset from the central axis, creating an asymmetric contact area that concentrates shaking forces in one direction while maintaining clearance fit to avoid lateral forces on threads
Solution Approach 2:
The contact surface between the elliptic cylinder and circular groove is designed with non-uniform contact distribution, creating a concentrated contact area at one location that provides shockproof effect through force concentration while the clearance fit ensures no lateral force is transmitted to the threads
2Reliability
If interference fit is used between upper and lower nuts, then shockproof effect is improved through extrusion force, but assembly complexity increases and thread life is adversely affected
Solution Approach 1:
The asymmetric elliptic cylinder within the circular groove creates a specific fit type that provides shockproof effect through controlled contact while avoiding the complexity and thread damage associated with interference fit
Solution Approach 2:
The local contact area between the elliptic cylinder and circular groove provides the necessary shockproof effect through concentrated force transmission, while the overall clearance fit simplifies assembly compared to interference fit
3Ease of operation
If uniform force distribution is used between nuts, then assembly is simplified, but slippage occurs due to lack of force concentration
Solution Approach 1:
The asymmetric elliptic cylinder geometry creates non-uniform force distribution with concentrated contact at specific locations, preventing slippage while maintaining relatively simple assembly through clearance fit
Solution Approach 2:
The contact force is concentrated at specific local areas between the elliptic cylinder and circular groove, creating high friction zones that prevent slippage while the overall design remains simple to assemble
Data Source
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AI summary
The present invention relates to a shockproof nut kit, comprising an upper nut and a lower nut, in which an end surface of the upper nut is provided with a boss of elliptic cylinder; on the upper end surface of the elliptic cylinder at a longer planar extension side is provided an unfilled corner; in an end surface of the lower nut is concavely formed a cylindrical groove matching with the boss of elliptic cylinder, and in the assembly state, the boss of elliptic cylinder on the upper nut is in clearance fit with the cylindrical groove in the lower nut. The present invention avoids the slipping and displacement of nuts in the meshing process, and ensures the coaxiality of the upper and lower nuts during installation to the utmost. In terms of both safety and shockproof, the present invention achieves satisfactory results, the installation thereof is convenient and reliable, and the disassembly thereof is simple.