Tubeless Bicycle Wheel Spoke Hole Plug Design
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Solution Overview
Problem
Tubeless bicycle wheels face challenges in sealing spoke holes to prevent air leakage, as existing solutions are not effective in maintaining a tight seal under various rim profiles and pressure conditions.
Innovation Solution
A plug system with a cap, legs, and barbs is used to seal spoke holes, featuring a resilient member and alignment features, which can be shaped to match non-planar rim contours, providing a secure and removable seal to prevent air leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing sealing solutions are used for spoke holes, then installation may be simple, but sealing effectiveness deteriorates under various rim profiles and pressure conditions
Solution Approach 1:
The plug incorporates a resilient member (O-ring) with specific material properties (softer than the cap) that can deform locally to conform to different rim surface contours. The barbs are positioned and shaped to engage specifically with the inner edge of the annular panel, providing localized mechanical interlocking that adapts to various rim profiles while maintaining sealing effectiveness under pressure.
Solution Approach 2:
The resilient member's thickness is precisely controlled at 50 to 95 percent of its unstressed thickness when compressed, allowing it to adapt its deformation characteristics based on installation conditions. This parameter control enables the seal to effectively accommodate different rim profiles and pressure conditions without compromising sealing reliability.
2Ease of operation
If the cap area is made larger to facilitate nipple passage, then ease of operation improves, but the plug size and complexity increase
Solution Approach 1:
The plug is divided into distinct functional segments: a cap with sufficient area for nipple passage, legs that extend through the access hole, and barbs that engage the rim. This segmentation allows each component to be optimized independently - the cap provides operational ease while the legs and barbs provide secure attachment, reducing overall device complexity through functional specialization.
3Reliability
If the resilient member is compressed to 50-95 percent thickness to improve sealing, then sealing effectiveness improves, but manufacturing precision requirements increase
Solution Approach 1:
The resilient member's compressed thickness is designed to be 50 to 95 percent of its unstressed thickness, creating a controllable deformation range that balances sealing effectiveness with manufacturing feasibility. This parameter specification ensures adequate compression for reliable sealing while allowing sufficient tolerance for standard manufacturing processes.
Solution Approach 2:
The plug combines materials with different properties: a cap made of one material and a resilient member made of a softer material. This composite construction allows the softer resilient member to accommodate dimensional variations and deformations, reducing the impact of manufacturing precision limitations while maintaining effective sealing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The plug system effectively seals spoke holes, minimizing air loss and allowing for easy installation and removal, while maintaining structural integrity under different pressure conditions and rim profiles.
Implementation Method 1
a resilient member (e.g., an O-ring made of a softer material than the cap) compressed between the cap and the outer surface of the annular panel
Implementation Method 2
a barb (e.g., a plurality of barbs) protruding radially from the leg to at least partially engage the inner edge of the annular panel
Data Source
AI summary
A bicycle wheel is disclosed having a spoke, a nipple coupled to the spoke, and a rim coupled to the nipple and having an annular panel with inner and outer surfaces and an access hole. A plug is positioned over the access hole and includes a cap that is larger than the access hole, a leg extending from the cap and through the access hole, and a barb protruding radially from the leg to at least partially engage the inner surface of the annular panel. The plug can further include a resilient member compressed between the cap and the outer surface of the annular panel. On some rims, the annular panel has a non-planar contour. For these rims, the resilient member and/or the cap can be shaped to match the non-planar contour of the annular panel.