Integrated Bicycle Bearing Cup for Larger Rolling Elements
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Solution Overview
Problem
Current bicycle bearing systems, such as bottom bracket and headset bearings, face issues with small ball bearing sizes due to limited space, leading to premature wear and failure under load, especially in applications like mountain bikes with long travel forks, where small balls are inadequate to carry the load.
Innovation Solution
The design incorporates an integrated cup with a non-flanged outer diameter, where the inner surface of the cup acts as the outer race, allowing for larger rolling elements to maximize size within the given dimensions, thereby increasing load-bearing capacity and extending bearing life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a separate outer race is used in the bearing assembly, then the bearing components can be manufactured independently with standard tolerances, but the available space for rolling elements is reduced, limiting bearing size and load capacity
Solution Approach 1:
The patent merges the outer race function with the cup structure into a single integrated component. The cup's inner surface directly serves as the outer race, eliminating the need for a separate outer race component. This integration maximizes the space available for rolling elements within the bearing assembly, allowing for larger bearing sizes and increased load capacity while simplifying the overall structure.
2Area of stationary object
If smaller rolling elements are used to fit within the limited space of the cup and bearing assembly, then the bearing assembly can fit within the fixed bottom bracket shell dimensions, but the load bearing capability and lifespan are reduced
Solution Approach 1:
The patent optimizes the spatial arrangement by eliminating the separate outer race, effectively redistributing the available space in radial and axial dimensions. This dimensional optimization allows larger rolling elements to be accommodated within the same external envelope, increasing load bearing capability without exceeding the fixed bottom bracket shell dimensions.
3Reliability
If cartridge bearings are pressed into the cup with tight tolerances to ensure proper fit, then bearing performance is optimized, but manufacturing becomes challenging and may require glue which can leak into seals
Solution Approach 1:
The integration of the outer race with the cup eliminates the separate pressing operation for the outer race. The cup's inner surface is directly machined to serve as the outer race, ensuring proper alignment and fit without requiring separate pressing operations or glue application. This reduces manufacturing complexity and eliminates the risk of glue leakage into seals while maintaining reliable bearing performance.
Data Source
AI summary
A bicycle bearing system comprising: an integrated cup, the integrated cup having a non-flanged outer diameter; a plurality of rolling elements configured to abut and rotate against an inner surface of the cup race; an inner race configured to abut and rotate about the plurality of rolling elements, the inner race having an inner diameter; wherein the rolling elements do not have a separate outer race, but rather the inner surface of the integrated cup acts as the outer race to the rolling elements; wherein the rolling elements' sizes are maximized to the limitation that the non-flanged outer diameter is smaller or equal to a first maximum diameter, and wherein the rolling elements sizes are maximized to the limitation that the inner diameter is greater or equal to a first minimum diameter.