Composite Spoke Nipple Structure for Corrosion-Resistant Bicycle Wheels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing spoke nipples made of different metals, such as steel and aluminum, can lead to corrosion reactions, causing damage.
Innovation Solution
A spoke nipple made of a fibrous composite material with reinforcing elements, such as carbon or glass fibers, that is manufactured to prevent corrosion and provide flexibility in use with various wheel components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal spoke nipples (steel or aluminum) are used to connect spokes and rims, then the structural strength and durability are sufficient, but corrosion reactions occur when dissimilar metals (steel spokes with aluminum rims) are combined, causing damage
Solution Approach 1:
The spoke nipple is manufactured from a fibrous composite material comprising reinforcing elements (such as glass fibers, carbon fibers, or aramid fibers) embedded in a matrix material (such as polyamide, polyester, or epoxy). This composite structure provides both mechanical strength and corrosion resistance, eliminating the galvanic corrosion problem that occurs with dissimilar metal combinations while maintaining the necessary structural integrity for connecting spokes to rims
2Weight of moving object
If traditional metal spoke nipples are used, then manufacturing simplicity and cost-effectiveness are maintained, but the weight is higher compared to composite materials
Solution Approach 1:
The fibrous composite material enables significant weight reduction compared to traditional metal spoke nipples. The manufacturing process involves injecting the composite material into a mold cavity in a single operation, which maintains ease of manufacture and cost-effectiveness while achieving the weight reduction goal. The composite material can be processed using conventional injection molding techniques, ensuring manufacturing simplicity is preserved
3Weight of moving object
If a fibrous composite material is used for the spoke nipple, then weight is reduced and corrosion resistance is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The manufacturing process utilizes parameter changes by controlling the injection of liquid or semi-liquid composite material into the mold cavity. The material transitions from a fluid state during injection to a solid state during curing, allowing complex geometries (including internal threads and tool receiving elements) to be formed in a single operation. This parameter change approach simplifies the overall manufacturing process despite using composite materials
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 solution achieves a lightweight, corrosion-resistant spoke nipple that can be used with aluminum rims and steel spokes, offering enhanced flexibility and stability while maintaining structural integrity.
Implementation Method 1
The nipple body is manufactured from a fibrous composite material and comprises reinforcing elements and at least one matrix material
Data Source
AI summary
A wheel component of a bicycle, including a spoke nipple with a nipple body and two opposite end portions remote from one another, to detachably connect a spoke of a wheel with a rim or a hub of a wheel. One of the end portions forms a nipple head. The nipple body has a takeup for an end of a spoke. The takeup includes a thread for fastening a spoke. The nipple body is manufactured from a fibrous composite material and includes reinforcing elements and at least one matrix material. The nipple body includes a tool receiving element to enable setting and adjusting the spoke tension.