Bicycle Hub Spoke Interface With Three-Point J-Bend Support
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Solution Overview
Problem
Conventional bicycle wheels with hub and spoke arrangements are prone to spoke failure due to uneven tension, vibration, and load cycling, leading to issues like shimmy and breakage.
Innovation Solution
A novel bicycle hub and spoke arrangement that creates three areas of contact between the spoke and the flange, specifically at the J bend area, to enhance resistance to breakage and address shimmy, using a hub shaft with radially extending flanges and spokes connected in a manner that provides additional support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single-area spoke-to-flange connection is used, then the structure is simple, but the spoke is prone to breakage due to vibration and load cycling
Solution Approach 1:
The spoke-flange connection is segmented into three distinct contact areas: a first contact area at the spoke head, a second contact area at the J bend region, and a third contact area at the spoke body. This segmentation distributes the load and vibration stresses across multiple points, preventing stress concentration at a single location and thereby reducing spoke breakage while maintaining structural simplicity.
Solution Approach 2:
Different regions of the spoke are engaged with the flange at different locations to provide localized support where needed. The J bend region specifically receives support at the second contact area, which is the most vulnerable region during vibration and load cycling. This local quality enhancement targets the specific weakness without requiring complex modifications throughout the entire spoke structure.
2Object-generated harmful factors
If conventional spoke arrangement is used, then the wheel structure is simple, but shimmy occurs due to spoke vibration
Solution Approach 1:
By dividing the spoke-flange interface into three contact areas, the connection provides multiple stabilization points that reduce the amplitude and frequency of spoke vibrations. The distributed contact points act as dampers, preventing the buildup of vibrational energy that causes shimmy while keeping the overall connection structure simple and straightforward to implement.
3Reliability
If higher spoke count is used to reduce vibration, then spoke reliability improves, but aerodynamic performance decreases
Solution Approach 1:
The three-area contact connection provides enhanced vibration resistance at the spoke-flange interface, allowing spokes to withstand vibrational loads better. This improved connection reliability enables the use of fewer spokes (lower spoke count) while maintaining vibration resistance, thereby reducing aerodynamic drag from spoke wind resistance.
Solution Approach 2:
The invention changes the connection parameter from a single contact point to three contact areas, fundamentally altering how loads are transmitted. This parameter change increases the effective connection strength and vibration damping capability, allowing for optimized spoke count that balances reliability with aerodynamic efficiency.
Data Source
AI summary
A bicycle hub and spoke arrangement is provided. The bicycle hub and spoke arrangement includes a bicycle axle supported for rotation by a hub shaft. A plurality of flanges extend radially from the hub shaft. Each of the plurality of flanges has a plurality of apertures. A plurality of spokes, each having a first end, an opposing second end and a body extending therebetween. The second end of each of the plurality of spokes is connected to an outer rim. The first end of each of the plurality of spokes is connected to one of the plurality of circumferentially oriented apertures of the plurality of flanges in a manner such as to create three areas of contact between the first end of each of the plurality of spokes and the associated flange, thereby strengthening a J bend area of the spoke and address spoke failure and shimmy.