Integrated Bicycle Bearing Cup for Larger Rolling Elements
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Solution Overview
Problem
Current bicycle bearing systems face issues with small ball bearing sizes due to limited space, leading to premature wear and failure under load, especially in applications like bottom brackets and headsets, where small bearings are inadequate to handle the forces and misalignment issues.
Innovation Solution
The integration of a single unit with an inner surface acting as the outer race, allowing for larger rolling elements that can withstand greater loads and reduce the likelihood of bearing failure, by eliminating the need for a separate outer race and providing a more robust assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a separate outer race is used in the bearing assembly, then the bearing can be pressed into the cup, but the space available for rolling elements is limited, resulting in small ball size and reduced load capacity
Solution Approach 1:
The patent merges the outer race function directly into the cup structure, eliminating the need for a separate outer race component. The cup's inner surface serves dual purposes: providing structural support and acting as the outer race for the rolling elements. This integration increases the available space for larger rolling elements, thereby improving load capacity while reducing the number of parts.
2Strength
If smaller rolling elements are used to fit within the limited space, then the bearing assembly can be installed in the fixed diameter bottom bracket shell, but the load bearing capability is reduced and bearing life is shortened
Solution Approach 1:
The patent optimizes the radial dimension by eliminating the separate outer race, thereby increasing the radial space available for the rolling elements. This dimensional optimization allows larger rolling elements to be accommodated within the same overall bearing assembly outer diameter, improving load bearing capability without changing the installation dimensions.
3Reliability
If cartridge bearings are pressed into the cup, then the bearing can be installed, but maintaining proper tolerances is challenging, leading to bearings being too loose or too tight, causing premature wear
Solution Approach 1:
The patent combines the cup and outer race into a single integrated structure, eliminating the interface between these two components. This integration removes the tolerance accumulation problem that occurs when pressing a separate outer race into the cup, ensuring consistent and reliable bearing performance without the need for precise tolerance control during assembly.
4Volume of moving object
If the cup diameter is increased to accommodate larger bearings, then larger rolling elements can be used, but the cup may not fit within the fixed diameter bottom bracket shell
Solution Approach 1:
The patent integrates the outer race function into the cup structure, allowing the cup's inner surface to serve as the bearing race. This eliminates the need for additional thickness required for a separate outer race, enabling larger rolling elements to be accommodated within the same outer diameter constraints of the bottom bracket shell.
Data Source
AI summary
A bicycle bearing system comprising: an integrated cup, the integrated cup having an outer diameter; a plurality of rolling elements configured to abut and rotate against a first race groove located on an inner surface of the integrated cup; a second race groove configured to abut and rotate about the plurality of rolling elements, the second race groove located on an inner surface of the inner race, the inner race having an inner diameter; where 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; and where the rolling elements, integrated cup and inner race are axially locked when assembled as a single cartridge unit due to the geometry of the rolling elements, first race groove and second race groove.