Bicycle Chain Closing Link With Segmented Pin Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing chain-closing links for bicycle drive chains fail to prevent undesired detachment under pronounced loading, such as vibration or uneven terrain, due to play between the pin and the small end diameter of the assembly opening, leading to instability and potential chain failure.
Innovation Solution
A chain-closing link design featuring a closing plate with a long hole having an insertion opening, a retaining opening, and a displacement region that narrows to form a narrowed neck or head location, with a chain pin connected in a rotationally fixed manner, where the pin head and neck are sized to ensure secure clamping within the retaining opening, and a recess in the connecting region for a non-concave peripheral region, enhancing stability and engagement with sprockets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the assembly opening is designed with a small end diameter to retain the pin, then pin retention is improved, but play between the pin and opening causes undesired detachment under loading
Solution Approach 1:
The assembly opening is segmented into three distinct regions: an insertion opening with larger diameter for easy pin insertion, a displacement region with narrowed neck location for guiding pin movement, and a retaining opening with small diameter for secure pin retention. This segmentation allows each region to perform its specific function optimally without compromising overall reliability
Solution Approach 2:
Different regions of the assembly opening have different diameters tailored to specific functions: the insertion opening has a larger diameter to facilitate pin insertion, the displacement region has a narrowed section to guide pin movement, and the retaining opening has a small diameter to securely hold the pin. This local variation in quality eliminates play while maintaining reliable retention
2Reliability
If the closing link is designed to prevent detachment, then reliability is improved, but the structure becomes more complex
Solution Approach 1:
The assembly opening serves multiple functions: it acts as an insertion path for the pin, provides a displacement region with narrowed sections to guide pin movement, and functions as a retaining opening for secure pin retention. This multi-functionality reduces the need for additional separate components, maintaining structural simplicity while improving reliability
Solution Approach 2:
The insertion opening, displacement region, and retaining opening are merged into a single continuous long hole structure in the closing plate. This integration eliminates the need for separate components for each function, reducing structural complexity while achieving reliable pin retention through the combined features
3Reliability
If the pin is secured tightly to prevent play, then detachment prevention is improved, but manufacturing precision requirements increase
Solution Approach 1:
The assembly opening is divided into regions with different diameters, with the insertion opening having a larger diameter that accommodates normal manufacturing tolerances. This segmentation allows the critical retention function to be achieved in the smaller-diameter retaining opening while the larger insertion opening provides tolerance compensation during assembly
Solution Approach 2:
The diameter parameter of the assembly opening is varied along its length, creating a tapered profile with larger diameter at the insertion end and smaller diameter at the retention end. This parameter change allows easy insertion with tolerance compensation while achieving secure retention with minimal play
Data Source
AI summary
A chain-closing link for a bicycle chain including two closing parts. Each of the closing parts includes a closing plate having a retaining opening and a displacement region. Each of the closing parts also includes a chain pin. The closing plate includes a recess and/or a hole having a securing region.