Bicycle Wheel Assembly with Direct Frame Engagement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bicycle wheel assemblies are heavy due to complex and robust component interactions, leading to decreased lateral stiffness and assembly complications, which may not meet the requirements of all riders for lightweight and robust wheels.
Innovation Solution
A bicycle wheel assembly featuring a hub with laterally spaced bearings that directly engage the bicycle frame, simplifying assembly and enhancing lateral stiffness through a direct load communication method, where a hollow axle supports the bearings and frame, reducing the number of components involved in load transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple components (axle, bearings, end caps) are used to interface with dropouts, then the wheel assembly is robust and reliable, but the mass of the wheel assembly increases
Solution Approach 1:
The patent combines the axle, bearings, and dropout interface into a single integrated hub assembly. The hub directly receives the fork blades with bearings positioned to directly engage the fork, eliminating the need for separate end caps and reducing the number of interfaces. This merging of components maintains reliability while reducing overall mass.
Solution Approach 2:
The patent extracts and eliminates unnecessary intermediate components from the traditional wheel assembly. Specifically, end caps are removed entirely, and the axle is made solid rather than hollow, removing the skewer rod and head components. This extraction of redundant parts reduces mass while maintaining the essential bearing support function.
2Strength
If multiple interfaces between components are provided, then the wheel assembly is robust, but the assembly and maintenance complexity increases
Solution Approach 1:
The patent merges multiple component interfaces into a single integrated hub-dropout interface. The bearings are positioned within the hub to directly engage the fork blades, creating a single interface point rather than multiple separate interfaces between axle, end caps, and dropouts. This reduces assembly complexity while maintaining structural robustness.
Solution Approach 2:
The patent removes intermediate components that create additional interfaces. By eliminating end caps and using a solid axle design, the number of interfaces between moving parts is reduced. The bearing races directly engage the fork dropouts, simplifying the interface structure and reducing assembly and maintenance complexity.
3Ease of manufacture
If bearings are offset inboard relative to dropouts, then the wheel assembly accommodates component spacing, but lateral stiffness decreases
Solution Approach 1:
Instead of offsetting the bearings inboard from the dropout interface, the patent inverts the arrangement by positioning the bearings at the outermost extent of the hub, with the bearing races directly engaging the fork dropouts. This inversion places the bearing support as far laterally outward as possible, maximizing lateral stiffness while still accommodating proper component spacing through the hub's internal geometry.
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 results in a lightweight, robust, and laterally stiffer wheel assembly with improved longevity, as the direct engagement of bearings with the frame reduces lateral deflection and simplifies assembly and maintenance.
Implementation Method 1
a pair of bearings engaged with opposite sides of the hub... Each bearing has an outer surface that is engaged with the hub and an inner surface that is directly engaged by the portion of the bicycle frame
Data Source
AI summary
A wheel assembly, which is particularly applicable to bicycles, includes a hub, a pair of laterally spaced bearings, and is constructed to cooperate with a frame of a bicycle. The bearings include an outer race that is directly engaged with the hub. An inner race of each bearing is constructed to directly receive a portion of the bicycle frame such that the wheel is supported by direct interaction of the bicycle frame and the bearing members. Optionally, a hollow axle may extend between adjacent bearings to further enhance the lateral stiffness of the wheel assembly.