Symmetrical Panel Bicycle Wheel Manufacturing
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Solution Overview
Problem
The existing manufacturing process for bicycle wheels is time-consuming and costly due to the difficulty in installing and tensioning metal spokes, which also compromises the wheel's rigidity.
Innovation Solution
A bicycle wheel design and manufacturing method involving press-molding of panel members to form clinching and reinforcing portions, allowing for symmetrical assembly and reduced manufacturing time, using techniques like CO2 welding and press curl hemming to improve productivity and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal spokes are used to connect hub and rim, then the wheel has predetermined tension and structural integrity, but it is difficult to install the spokes and the manufacturing time and difficulty increase substantially
Solution Approach 1:
The wheel is divided into two symmetrical panel members (first and second panel members) that are joined together. Each panel member includes integrated rim portions, hub mounting ends, and spoke portions, effectively segmenting the complex spoke installation process into simpler panel fabrication and joining steps.
Solution Approach 2:
The spoke portions are integrated directly into the panel members during press-molding, merging the spoke structure with the panel body. This eliminates the need for separate spoke installation and tensioning steps, combining multiple functions into a single manufactured component.
2Strength
If metal spokes are used to provide required tension, then the wheel maintains structural integrity, but the required rigidity is reduced and costs increase
Solution Approach 1:
The panel members are formed using composite materials that combine the structural integrity of metal with the cost-effectiveness and rigidity of alternative materials. The press-molding process creates a composite structure that maintains wheel rigidity while reducing manufacturing costs compared to traditional metal spoke construction.
3Strength
If traditional casting methods are used to manufacture bicycle wheels, then the wheels have adequate strength, but the manufacturing time and mold costs are high
Solution Approach 1:
The panel members are press-molded with pre-formed spoke portions, hub mounting ends, and rim portions already integrated into the structure. This preliminary formation of all critical features during the molding process eliminates subsequent machining and assembly steps, significantly increasing manufacturing speed.
Solution Approach 2:
The manufacturing process transitions from traditional high-temperature casting to press-molding, changing the thermal and mechanical parameters of fabrication. This parameter change reduces mold costs and manufacturing time while maintaining wheel strength through the integrated panel member design.
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 method enhances design characteristics, reduces manufacturing and assembly time, and lowers costs by forming a robust and efficient bicycle wheel with improved rigidity and reduced mold and manufacturing expenses compared to traditional casting methods.
Implementation Method 1
forming a first rim portion, a first hub mounting end, and a first spoke portion on a first panel member by press molding, and forming a second rim portion, a second hub mounting end, and a second spoke portion on a second panel member by press molding
Implementation Method 2
using techniques like CO2 welding and press curl hemming to improve productivity and cost-effectiveness
Implementation Method 3
forming a first clinching portion and a second clinching portion, which protrude to one side, by bending the first panel member and the second panel member
Data Source
AI summary
A bicycle wheel includes a first panel member including a first rim portion for mounting a tire, a first hub mounting end connected to a hub, a first spoke portion for connecting the first rim portion and the first hub mounting end, a second panel member having a second rim portion for mounting the tire, a second hub mounting end connected to the hub, and a second spoke portion for connecting the second rim portion and the second hub mounting end, wherein the bicycle wheel is formed by joining the first panel member and the second panel member together such that the first panel member and the second panel member are symmetrical to each other about a line passing through the hub and the rim.