Ball Pin Thread Inhibition and Radial Support Against Loosening
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Solution Overview
Problem
Existing coupling pins, such as ball pins, face issues with mechanical loads causing stress and potential loosening in threaded connections due to lateral or radial forces, which existing sealing and frictional mechanisms fail to adequately address.
Innovation Solution
A coupling pin design featuring a thread shaft with a longitudinal thread inhibition and a disc-shaped radial support structure, which increases frictional engagement and provides lateral stabilization, ensuring stable axial positioning and retention under mechanical loads. The thread inhibition, potentially in the form of web-like structures or ribs, and the deformable radial support structure adapt to the thread opening, enhancing the frictional connection and distributing mechanical loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing ribs are provided to prevent liquid penetration into the threaded portion, then sealing performance is improved, but mechanical loads on the shaft portion increase causing stress and potential loosening
Solution Approach 1:
The patent divides the shaft into functionally separate sections: a sealing portion with sealing ribs for liquid prevention, and a thread portion for mechanical fastening. This segmentation allows each section to optimize its specific function without compromising the other, addressing both sealing performance and mechanical strength requirements.
Solution Approach 2:
The patent introduces a sealing portion as an intermediary element between the external environment and the threaded connection. This sealing portion absorbs the sealing function, preventing liquid from reaching the threaded portion, thereby eliminating the need for sealing ribs to also bear mechanical loads and resolving the contradiction between sealing and strength.
2Adaptability or versatility
If frictional connection is used for adjustable screw-in depth, then adaptability is improved, but mechanical stress increases requiring stable and mechanically resistant plastics
Solution Approach 1:
The patent changes the material parameter by specifying plastics with particular mechanical resistance properties (≥20 MPa tensile strength, ≥1.5 mm/notch impact strength). This parameter change enables the material to withstand the mechanical stresses of frictional connection while maintaining adjustability, resolving the contradiction between adaptability and strength requirements.
3Reliability
If sealing ribs create frictional connection for turning inhibition, then connection stability is improved, but difficulty in installation increases due to high frictional forces
Solution Approach 1:
The patent segments the shaft into a sealing portion and a thread portion, allowing the sealing ribs to be located in a dedicated sealing portion rather than on the threaded shaft itself. This segmentation enables the sealing function to provide connection stability while the separate thread portion maintains ease of installation by reducing unnecessary friction during the fastening process.
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 design ensures reliable axial positioning and retention of the coupling pin within the thread opening, even under mechanical stress, by increasing frictional engagement and distributing lateral loads, thereby maintaining the connection's stability and preventing loosening.
Implementation Method 1
a frictional connection between the thread of the thread shaft and a counter thread engaging therein and being present at a radial inner wall of a thread opening is increasable
Implementation Method 2
a disc-shaped radial support structure is provided between the coupling pin and the longitudinal portion of the thread, a radial extension of which is adaptable to a diameter of the thread opening so that the coupling pin is supportable against a lateral load
Data Source
AI summary
A coupling bolt or pin, in particular a ball pin, with a coupling head, such as a ball head, and a thread shaft. The thread shaft comprises a thread in a longitudinal portion of the thread shaft, which extends parallel to a central longitudinal axis of the thread shaft. Within the longitudinal portion of the thread a thread inhibition is provided by means of which a frictional connection between the thread and a counter thread engaging therein and being present at a radial inner wall of a thread opening is increasable. A disc-shaped support structure is provided between the coupling pin and the thread, a radial extension of which is adaptable to a diameter of the thread opening so that the coupling pin is supportable against a lateral load with respect to the axis of the coupling pin within the thread opening.