Threaded Pin Coupling Ridge for Vibration-Resistant Assembly
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Solution Overview
Problem
Threaded pins in automated assembly lines often become unscrewed due to vibrations or position changes, leading to instability and increased complexity in pre-screwing processes.
Innovation Solution
A threaded pin design featuring a coupling end portion with annular grooves and a distal annular ridge that allows for play within the threaded hole, enabling the pin to remain attached even without screwing, and allowing for stable coupling up to specific angular positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pin is pre-screwed more deeply into the threaded hole to prevent unscrewing, then the reliability of the connection is improved, but the device complexity and assembly time increase
Solution Approach 1:
The pin is divided into two functional parts: a threaded stem for screwing into the hole and a coupling end portion with annular grooves for engagement. This segmentation allows the pin to achieve reliable connection through the coupling features rather than requiring deep pre-screwing, thus improving reliability without increasing complexity
Solution Approach 2:
The annular ridges formed by the annular grooves act as intermediary engagement features between the pin and the threaded hole. These ridges engage with the material of the threaded hole to prevent unscrewing, serving as a mediator that provides connection stability without requiring the pin to be screwed deeply into the hole
2Reliability
If the pin is pre-screwed more deeply into the threaded hole to prevent unscrewing, then the reliability of the connection is improved, but the assembly time increases
Solution Approach 1:
The coupling end portion with annular grooves is designed to engage with the threaded hole immediately upon insertion, before any screwing operation. This preliminary engagement action prevents unscrewing from the outset, providing reliability without requiring time-consuming deep pre-screwing operations
Solution Approach 2:
The pin's coupling end portion automatically engages with the threaded hole through its annular grooves when inserted, without requiring additional pre-screwing operations. The design makes the pin self-sufficient in maintaining its connection, eliminating the need for time-consuming additional operations to ensure reliability
3Ease of operation
If a simple connection of the pin to the threaded hole is made, then the ease of operation is improved, but the pin becomes unscrewed due to vibrations or position changes
Solution Approach 1:
The coupling end portion with annular grooves provides dynamic engagement that adapts to vibrations and position changes. The annular ridges can maintain engagement with the threaded hole material even when relative movement occurs, allowing the connection to remain stable under dynamic conditions while keeping the assembly process simple
Solution Approach 2:
The solution moves from relying solely on axial screwing force to maintaining connection through radial engagement of the annular ridges with the threaded hole material. This dimensional shift provides connection stability in multiple directions, preventing unscrewing due to vibrations or position changes while maintaining assembly simplicity
Data Source
AI summary
A threaded pin comprises a threaded cylindrical stem that extends between a proximal stem end and a distal stem end, and a coupling end portion that extends from the distal stem end. In the coupling end portion, at least one annular groove is formed, which is distally delimited by a distal annular ridge that defines a maximum outer diameter of the coupling end portion. The maximum outer diameter of the coupling end portion is smaller than the inner diameter of the threaded cylindrical stem in such a way that the coupling end portion may be inserted with play into a threaded hole wherein the threaded pin may be screwed, the distal annular ridge being suitable for insertion between the ridges of the female thread of the threaded hole.