Flexible Fibrous Wheel Spokes for Lightweight Strength
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Solution Overview
Problem
Existing bicycle wheel spokes made of stainless steel are heavy and require a tradeoff between strength and weight, and existing fiber spokes face manufacturing challenges with alignment and off-axis tension, leading to increased assembly costs.
Innovation Solution
The use of flexible wide-body spokes made of fibrous materials, such as thermotropic liquid crystal fibers, which are lightweight, strong, and resilient, allowing for fewer spokes and easier assembly by maintaining strength and flexibility even under bending stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If steel spokes are made thinner to reduce weight, then weight decreases, but strength decreases
Solution Approach 1:
The patent applies composite materials by combining carbon fiber filaments with a resin matrix to create spokes that have both high strength and low weight. The carbon fiber provides exceptional tensile strength while the resin binds the fibers together, creating a composite structure that outperforms solid steel spokes in both strength-to-weight ratio and flexibility.
Solution Approach 2:
The patent changes the material parameters from solid metal to fibrous composite, fundamentally altering the mechanical properties. The carbon fiber composite allows for variable fiber orientation and density to optimize both strength and weight characteristics, enabling spokes that are simultaneously lighter and stronger than traditional steel spokes.
2Weight of moving object
If fiber spokes are made with small diameter to reduce weight, then weight decreases, but manufacturing difficulty increases due to alignment requirements
Solution Approach 1:
The patent uses flexible carbon fiber filaments that can bend and conform to the wheel structure. This flexibility eliminates the need for precise axial alignment during assembly, as the fibers can accommodate off-axis tensions and bending without compromising structural integrity or requiring complex alignment procedures.
Solution Approach 2:
The patent introduces dynamic flexibility to the spoke structure through the use of resilient fiber materials. The spokes can dynamically adjust their orientation and absorb misalignment during assembly and operation, transforming a static alignment problem into a dynamic adaptation solution that simplifies manufacturing.
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 flexible spokes provide three times the strength and half the weight of steel spokes, reducing the number required and simplifying assembly, thus achieving a lightweight and durable wheel design.
Implementation Method 1
The spokes are also flexible and resilient such that they can bend while retaining their integrity and strength
Data Source
AI summary
A wheel with flexible spokes, including a rim and hub, and spokes between the rim and hub made of fibrous material that causes the spokes to be both lighter in weight and stronger than comparable steel spokes. The spokes are also flexible and resilient such that they can bend while retaining their integrity and strength.