Removable Threaded Pin for One-Sided Joining of High-Strength Parts
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Solution Overview
Problem
Existing joining technologies are limited to conventional strength materials and require two-sided access, and there is a need for removable one-sided joining solutions, especially in applications involving high-strength materials and components that need easy maintenance, such as battery packs in vehicles.
Innovation Solution
A pin with a specific design featuring a pin shaft, enlarged head, and threaded portions allows for a removable connection between components, enabling one-sided joining and easy removal using a rotary tool, suitable for high-strength materials and automated assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional joining methods (clinching, punch riveting, self-piercing riveting) are used without pre-formed holes, then joining of conventional strength materials is achieved, but the maximum forces are reduced and they cannot pierce or penetrate high-strength materials
Solution Approach 1:
The pin is divided into three distinct portions: a first portion with constant cross-section and thread for engagement, a second portion with enlarged cross-section for piercing and forming the recess, and a third portion transitioning to the head. This segmentation allows each portion to perform its specific function optimally - the first portion provides threaded engagement for strength, the second portion enables piercing of high-strength materials, and the third portion forms the connection geometry.
Solution Approach 2:
Different portions of the pin have different cross-sectional areas and properties tailored to their specific functions. The second portion has an enlarged cross-section specifically at the piercing location to concentrate force and penetrate high-strength materials, while the first portion has a smaller cross-section with threads for secure engagement. This local variation in geometry enables the pin to handle both piercing and strong connection.
2Ease of operation
If one-sided joining technology is used, then access from both sides is not required, but the ability to join high-strength materials and provide removable connections is limited
Solution Approach 1:
The pin design enables a dynamic joining process where the pin is first inserted through both components in one direction, then the second portion forms a recess in the first component that allows the pin to be secured from the first side only. This dynamic process transforms a potentially two-sided operation into a one-sided removable connection, providing both ease of operation and versatility.
Solution Approach 2:
The second portion of the pin acts as an intermediary that pierces through the high-strength material and forms the recess, enabling the connection without requiring access from both sides. This intermediary action allows the pin to establish a removable connection in high-strength materials while maintaining one-sided access capability.
3Ease of repair
If removable connections are implemented for maintenance purposes, then ease of repair is improved, but the strength and robustness of the joining may be compromised
Solution Approach 1:
The pin is segmented into a threaded first portion and a second portion with enlarged cross-section. The threaded first portion provides strong, reliable engagement that maintains joint robustness, while the overall pin design allows for controlled removal. This segmentation enables the joint to be both strong during operation and removable for maintenance.
Solution Approach 2:
The pin utilizes different geometric parameters in different portions - the threaded first portion uses thread geometry for strong engagement, while the second portion uses enlarged cross-section for piercing and recess formation. These parameter variations allow the pin to provide both strong joining and removable capability without compromising joint robustness.
Data Source
Figure 1~2C
Figure 3~4
Figure 5A~5B
AI summary
Process for removing a pin from an arrangement and pin for establishing a removable connection between at least two components comprising: a pin shaft extending along a longitudinal axis, a pin head, the diameter of the head being enlarged along other direction orthogonal to the longitudinal axis, wherein the pin head comprises an upper side, lateral edges and a transition portion is arranged between the lateral edges and the pin shaft, an ogival pin tip formed on one end side of the pin shaft, the pin head formed at an end portion on the other end side, wherein the pin shaft comprises a first portion having a constant cross-section and a second portion having an enlarged cross-section with regard to the first portion, wherein the second portion extends between the transition portion and the first portion, and wherein the first portion extends between the pin tip and the second portion, wherein a thread is provided on the first portion, the second portion being at least in part a smooth portion.