Bicycle Hub Spoke Layout With Three-Point Flange Support
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Solution Overview
Problem
Conventional bicycle wheels experience spoke failure due to uneven tension, stress from hard riding, and vibrations, leading to issues like shimmy.
Innovation Solution
A novel bicycle hub and spoke arrangement that provides three areas of contact between the spoke and the flange, enhancing the structural integrity of the J bend area and addressing spoke failure and shimmy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single-point spoke-flange contact is used, then the structure is simple, but spoke failure occurs due to vibration and load cycling
Solution Approach 1:
The flange contact surface is segmented into three distinct contact areas (first, second, and third areas) that distribute the load along the spoke's length. This segmentation transforms the single-point contact into multiple distributed contact points, reducing stress concentration and preventing spoke failure under vibration and load cycling.
Solution Approach 2:
Different portions of the spoke are engaged with the flange at different locations (head, J bend, and body sections) to provide localized support where needed. This local quality approach strengthens specific vulnerable areas of the spoke without requiring overall structural changes, thereby improving reliability while maintaining simplicity.
2Strength
If higher spoke tension is used to improve wheel stiffness, then wheel efficiency increases, but spoke breakage risk increases under vibration
Solution Approach 1:
The three-area contact design provides beforehand cushioning by distributing tension forces across multiple flange contact zones. This pre-distribution of stress prevents sudden load spikes that would otherwise cause breakage in high-tension spokes subjected to vibration and impact loads during operation.
Solution Approach 2:
The multi-area contact arrangement allows the spoke to dynamically adjust its load distribution during wheel rotation and under varying loads. The flexible engagement across three areas enables the spoke to better absorb vibrational energy and load cycling without compromising the high static tension needed for wheel stiffness.
3Reliability
If more spokes are used to reduce load per spoke, then spoke failure resistance improves, but aerodynamic performance deteriorates
Solution Approach 1:
The invention changes the contact parameter from single-point to three-area contact, which fundamentally alters the stress distribution along the spoke. This parameter change allows fewer spokes to be used while maintaining or improving failure resistance, as each spoke is better protected against vibration and load cycling through the distributed contact areas.
Data Source
AI summary
A bicycle hub and spoke arrangement is provided. The arrangement includes flanges extending radially from a hub shaft. The flanges include apertures. The first end of each of a plurality of spokes engages with one of the apertures. A second end of the spokes is connected to an outer rim. Three areas of contact are created between the first end of the spokes and the associated flange. A first area of contact is formed as a head of each of the spokes is seated within one of the apertures. A second area of contact is formed as an inner radius segment of each spoke contacts a wall defining the one of the apertures and a third area of contact is formed as each of the spokes contacts an outer rim of the flange. The total quantity of spokes can be either 6, 8, 9, 10, 12, 15, 16 or 18.