Multi-Layer Cardboard Wheel for Bicycle Load Bearing
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Solution Overview
Problem
Conventional bicycle wheels lack sustainability and recyclability, and existing cardboard-based wheels fail to provide sufficient rigidity and durability for load-bearing applications.
Innovation Solution
A multi-layered cardboard wheel structure comprising high density cardboard (HDC) and low density cardboard (LDC) layers, with a central hub and a tire, offering enhanced compression, torsional, and flexural resistance, and environmental protection through coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials (metal, plastic) are used for bicycle wheels, then strength and rigidity are sufficient, but sustainability and recyclability are poor
Solution Approach 1:
The patent transforms cardboard from a traditionally weak material into a high-performance wheel material by changing its physical parameters through multi-layer construction. By stacking multiple cardboard layers with specific orientations and densities, the wheel achieves sufficient strength and rigidity for bicycle use while maintaining environmental benefits
Solution Approach 2:
The patent creates a composite structure using multiple cardboard layers with different properties (high density and low density layers). This composite approach allows the wheel to achieve mechanical properties comparable to conventional materials while remaining fully recyclable and environmentally friendly
2Ease of manufacture
If single-layer cardboard is used for wheels, then manufacturing is simple, but rigidity and load-bearing capacity are insufficient
Solution Approach 1:
The patent divides the wheel structure into multiple discrete cardboard layers rather than using a single thick layer. Each layer can be manufactured separately and then assembled, maintaining manufacturing simplicity while achieving superior mechanical properties through the layered configuration
Solution Approach 2:
The patent combines multiple cardboard layers with different densities and orientations to create a composite structure that achieves the required rigidity and load-bearing capacity. The high density layers provide strength while low density layers reduce weight, creating an optimized composite material
3Strength
If multi-layered cardboard structure is used, then rigidity and compression resistance improve, but manufacturing complexity increases
Solution Approach 1:
The patent applies different cardboard densities to different regions of the wheel structure. High density cardboard layers are positioned where maximum strength is needed (such as the rim and spokes), while low density layers are used in areas requiring less structural support, optimizing the strength-to-weight ratio
Solution Approach 2:
The patent transitions from thinking about cardboard strength in a single dimension to utilizing multi-layered three-dimensional structures. By stacking layers at different orientations and densities, the wheel achieves superior mechanical properties in multiple directions (compression, torsion, flexure) simultaneously
4Strength
If thicker cardboard layers are used, then load-bearing capacity increases, but wheel weight increases
Solution Approach 1:
The patent optimizes the thickness and density parameters of individual cardboard layers to achieve the minimum required load-bearing capacity. By carefully selecting layer thicknesses and densities, the wheel achieves sufficient strength for adult riders while minimizing weight through the use of low density cardboard in non-critical areas
Data Source
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AI summary
The disclosure provides a generally planar wheel, comprising a multi-layer cardboard body having at least one layer of a high-density cardboard sheet sandwiched between at least two layers of low-density cardboard sheet.