Bidirectional Tapered Bolt-Nut Threads for Self-Locking Stability
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Solution Overview
Problem
Existing thread technologies suffer from low connection strength, weak self-positioning ability, poor self-locking performance, low bearing capacity, poor stability, and susceptibility to loosening, especially under vibration or shaking, leading to safety concerns.
Innovation Solution
A connection structure featuring bidirectional tapered olive-like threads, where symmetrically bidirectional tapered external and internal threads form a cohesive relationship, utilizing conical surfaces to achieve self-locking and self-positioning through axial and counter-axial forces, enhancing stability and load-bearing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional thread structures are used, then the connection structure is simple and easy to manufacture, but the connection strength is low and self-locking performance is poor
Solution Approach 1:
The thread structure is segmented into multiple functional zones: a large-diameter section with first tapered threads for primary load bearing, and a small-diameter section with second tapered threads for secondary engagement. This segmentation allows each zone to optimize for specific functions, improving overall connection strength while maintaining manufacturability through standardized threading processes.
Solution Approach 2:
The connection structure employs asymmetric diameter distribution along the axial direction, with a large-diameter section and a small-diameter section. The first tapered threads and second tapered threads are configured with different pitch and angle parameters suited to their respective diameter zones. This asymmetric design optimizes stress distribution and enhances self-locking performance without significantly complicating the manufacturing process.
2Stability of the object's composition
If conventional thread structures are used, then the manufacturing process is simple, but the self-positioning ability is weak
Solution Approach 1:
The tapered thread geometry is designed to automatically guide the bolt and nut into proper alignment during the assembly process. The converging thread flanges create a self-centering effect that preliminarily positions the components correctly before full engagement, eliminating the need for complex positioning mechanisms or precise manual alignment procedures.
Solution Approach 2:
The tapered threads incorporate curved engagement surfaces that naturally guide the mating components into correct positional relationship. The gradual convergence of the thread flanges creates a self-aligning mechanism that improves self-positioning ability while maintaining compatibility with standard threading manufacturing methods.
3Reliability
If conventional thread structures are used, then the structure is simple, but the anti-loosening performance is poor under vibration
Solution Approach 1:
The self-locking function is extracted from the basic fastening function and implemented through the tapered thread geometry. The converging thread flanges generate continuous axial pressing force that actively counteracts loosening tendencies under vibration, separating the locking mechanism from the fastening mechanism while maintaining a relatively simple overall structure.
Solution Approach 2:
The tapered thread design creates preliminary anti-loosening action through its geometric configuration. The thread flanges are angled to generate continuous pressing force in the direction that prevents separation, providing proactive resistance against vibration-induced loosening before it occurs, rather than relying on reactive locking mechanisms.
4Force
If conventional thread structures are used, then the manufacturing is easy, but the bearing capacity is low
Solution Approach 1:
The connection structure utilizes the radial dimension by implementing a multi-diameter design with large-diameter and small-diameter sections. This dimensional variation allows the first tapered threads to engage with larger contact area for primary load bearing, while the second tapered threads provide additional engagement in a different radial zone, collectively enhancing bearing capacity without requiring excessive axial length or complex assembly procedures.
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 bidirectional tapered thread connection structure provides improved locking force, load-supporting capacity, anti-loosening performance, and stability, ensuring secure connections even under dynamic conditions and reducing the risk of accidental loosening.
Implementation Method 1
The basic condition for self-locking of the thread is that an equivalent friction angle shall not be smaller than a helical rise angle... when the inclined plane is inclined to a certain angle, the friction force of the slider at this time is exactly equal to the component of gravity along the inclined plane
Implementation Method 2
the thread is like an inclined plane wrapped around the cylinder; and the flatter the inclined plane is, the greater the mechanical advantage is... the principle of inclined plane... has become an important theoretical basis of the modern thread technology
Data Source
AI summary
A connection structure of a bolt and a nut of a thread outlining a symmetrically bidirectional tapered olive-like shape, an internal thread (6) on the inner surface of a columnar body (2) outlining a bidirectional tapered hole (41), an external thread (9) on the outer surface of a cylindrical body (3) outlining a bidirectional truncated cone body (71), and each complete threaded body unit forming a bidirectional tapered body in an olive-like shape (93) having a large middle part and two small ends, the left conical degree (95) and the right conical degree (96) being same and/or approximately same, solving the problems of poor self-positioning and self-locking of existing threads, etc. The performance mainly depends on the tapered face and conical degrees of the threaded body.