Bicycle Hub Overlapping Area Segmentation for Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bicycle hubs require complex alignment and significant manual adjustment for gluing, leading to increased manufacturing effort and weight due to the need for a considerable diameter difference between the hub shell and carbon sleeve, which complicates the assembly process.
Innovation Solution
A multi-part hub design featuring a hub shell with overlapping areas including a guiding section and an adhesive section, where the guide section has a smaller diameter tolerance than the adhesive section, allowing for easier assembly and reduced adjustment effort, eliminating the need for gauges and minimizing rework.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a considerable diameter difference is provided between the hub shell and carbon sleeve to ensure proper bonding, then bonding reliability is improved, but device complexity and manufacturing effort increase due to complex alignment requirements
Solution Approach 1:
The overlapping area is segmented into two distinct functional sections: a guiding section with smaller diameter tolerance for alignment, and an adhesive section with larger diameter difference for bonding. This segmentation allows each section to optimize its specific function without compromising the other.
Solution Approach 2:
Different diameter tolerance characteristics are applied to different portions of the overlapping area. The guiding section has tighter tolerance (smaller diameter difference) while the adhesive section has looser tolerance (larger diameter difference), creating local quality variations that satisfy different functional requirements within the same component interface.
2Reliability
If a considerable diameter difference is provided between the hub shell and carbon sleeve, then bonding capability is improved, but manufacturing precision requirements increase due to the need for exact concentricity alignment
Solution Approach 1:
The interface is divided into guiding and adhesive sections, where the guiding section with smaller diameter difference acts as a mechanical alignment feature that automatically establishes concentricity, while the adhesive section provides the bonding surface without requiring the same level of precision.
Solution Approach 2:
The guiding section acts as an intermediary element that mediates between the two components during assembly, establishing the correct concentric alignment before the adhesive section engages. This intermediary guiding feature eliminates the need for complex external alignment procedures.
3Reliability
If the entire overlapping area is provided as an adhesive section, then bonding area is maximized, but assembly complexity increases due to lack of guidance and requirement for manual adjustment
Solution Approach 1:
The overlapping area is segmented into a guiding section that provides mechanical alignment and an adhesive section that provides bonding. This segmentation maintains a sufficient adhesive area for reliable bonding while adding a guiding portion that dramatically simplifies assembly by providing self-alignment.
Solution Approach 2:
The guiding section enables the components to self-align during assembly through their geometric interference fit, eliminating the need for external alignment tools or complex manual adjustment procedures. The components guide themselves into the correct position.
4Reliability
If a considerable diameter difference is provided between hub shell and carbon sleeve, then adhesive bonding is improved, but production time increases due to manual adjustment requirements
Solution Approach 1:
By segmenting the overlapping area into guiding and adhesive sections, the patent enables rapid self-alignment during assembly while maintaining sufficient adhesive bonding area. This eliminates time-consuming manual adjustment operations and gauge measurements, significantly reducing production time.
Solution Approach 2:
The guiding section is designed to automatically establish the correct alignment position before the adhesive bonding process begins. This preliminary geometric alignment action eliminates the need for subsequent adjustment operations during the bonding process.
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 hub achieves simplified construction, reduced weight, and improved assembly accuracy with less manual adjustment, ensuring reproducible concentricity and minimizing manufacturing costs.
Implementation Method 1
The overlapping area includes a guiding section and an adhesive section
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The hub (1) comprises a hub housing, which has two end units (3,4) and a central part (5), where the central part is arranged between the end units. One end unit comprises a tubular insertion section (6), on which the central part is attached with a tubular attaching section (7). The insertion section and the attaching section overlap in an overlapping area (8) and are provided with a guide section and an adhesive section in the overlapping area.