Asymmetric Tapered Internal Thread for Self-Locking Connections
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Solution Overview
Problem
Existing thread technologies suffer from low joint strength, weak self-positioning ability, poor self-locking, low load-bearing capacity, poor stability, and poor compatibility, leading to issues such as loosening under vibration, which can result in safety hazards, especially in non-static and varying temperature environments.
Innovation Solution
A connection structure featuring a bi-directional tapered internal thread with a dumbbell-like asymmetric geometry, where the left taper is greater than the right taper, forming a cone pair with a traditional external thread, providing self-locking and self-positioning capabilities through the interaction of axial and anti-axial forces, and allowing for bidirectional load-bearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional thread structures are used, then manufacturing simplicity is maintained, but joint strength and load-bearing capacity are insufficient
Solution Approach 1:
The patent applies asymmetry by designing the internal thread with different taper angles on the left and right sides, creating an asymmetric bidirectional tapered structure where the left-end conical degree is greater than the right-end conical degree. This asymmetric geometry enables differential load distribution and enhanced self-locking capability while maintaining manufacturing feasibility through standard tapered thread machining processes.
2Stability of the object's composition
If conventional thread designs are used, then structural simplicity is maintained, but self-positioning ability and stability are weak
Solution Approach 1:
The asymmetric bidirectional tapered geometry with different left and right conical degrees provides inherent self-positioning capability. The unequal tapers create asymmetric contact surfaces that naturally resist lateral displacement and rotational misalignment, enhancing connection stability without requiring additional positioning features or complex assembly procedures.
3Reliability
If standard thread structures are used, then ease of manufacture is maintained, but self-locking capability and anti-loosening performance are poor
Solution Approach 1:
The patent changes the geometric parameters of the thread by introducing bidirectional tapers with different conical degrees. The left-end greater conical degree and right-end smaller conical degree create asymmetric friction characteristics that enhance self-locking capability. This parameter modification maintains compatibility with standard tapered thread manufacturing processes while significantly improving anti-loosening performance.
4Strength
If traditional threaded connections are used, then compatibility with existing systems is maintained, but load-bearing capacity and vibration resistance are insufficient
Solution Approach 1:
The patent applies local quality by creating different taper angles at different locations along the thread. The left-end greater conical degree provides enhanced load-bearing capacity in one direction, while the right-end smaller conical degree optimizes performance in the opposite direction. This localized geometric variation allows the single thread structure to handle bidirectional loads effectively, improving vibration resistance without requiring multiple components.
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 solution enhances joint strength, load-bearing capacity, stability, and compatibility, preventing loosening and ensuring reliable connections under various conditions, including non-static loads and temperature variations.
Implementation Method 1
the equivalent friction angle should not be less than the helix angle... The smoother the inclined plane, the greater the mechanical benefit
Implementation Method 2
The thread is like an inclined plane wrapped around a cylinder. The smoother the inclined plane, the greater the mechanical benefit
Implementation Method 3
providing self-locking and self-positioning capabilities through the interaction of axial and anti-axial forces, and allowing for bidirectional load-bearing
Data Source
AI summary
A connect structure of a traditional thread and an bi-directional tapered internal thread having a lager left-end conical degree, the internal thread 6 forming a helical shape on the inner surface of a cylindrical body 2, and the complete threaded body unit forming a bidirectional tapered hole 41 in a dumbbell shape 94 having a small middle part and two large ends, the left-end conical degree 95 being greater than the right-end conical degree 96. The internal thread has the capability of fitting a traditional external thread 9, and the fitted external thread 9 on the outer surface of a columnar body 3 outlines a helical special tapered body 7, solving the problems of poor self-positioning and self-locking of existing threads, etc.