Bicycle Hub Spoke Attachment Opening Design
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Solution Overview
Problem
Current bicycle wheel assemblies face challenges in spoke attachment design, particularly in maintaining efficient spoke attachment and maintenance without interfering with the hub axle, leading to complexities in assembly and maintenance.
Innovation Solution
The bicycle hub features a tubular body with a spoke attachment part that includes strategically designed attachment openings with varying lengths and cross-sectional areas, allowing for spoke pivotability and attachment without removing the hub axle, enhancing maintenance and assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional spoke attachment design is used, then spoke attachment is achieved, but interference with hub axle occurs and assembly complexity increases
Solution Approach 1:
The attachment opening is segmented into two distinct openings: a first opening positioned to receive the spoke end, and a second opening positioned to receive the hub axle. This segmentation allows the spoke and axle to be attached through separate pathways, eliminating interference between them and simplifying the assembly process.
Solution Approach 2:
The attachment opening extends in the radial direction of the hub, creating a dimensional pathway that allows both the spoke and hub axle to pass through without interfering with each other. This radial extension provides an additional spatial dimension for attachment, resolving the interference problem while maintaining structural integrity.
2Ease of repair
If spoke attachment opening is designed for easy access, then maintenance is simplified, but hub axle interference occurs
Solution Approach 1:
The attachment opening is divided into two separate openings positioned at different locations: the first opening provides easy access for spoke attachment and maintenance, while the second opening is positioned to accommodate the hub axle without interfering with spoke operations. This segmentation eliminates harmful interference while maintaining ease of maintenance.
Solution Approach 2:
The second opening acts as an intermediary structure that mediates between the spoke attachment function and the hub axle passage. It provides a dedicated pathway for the axle that prevents interference with the spoke attachment opening, thereby eliminating harmful factors while preserving maintenance accessibility.
3Ease of manufacture
If attachment opening structure is simplified, then manufacturing is easier, but spoke pivotability is restricted
Solution Approach 1:
The attachment opening is segmented into two simple circular openings rather than a complex single opening. This segmentation maintains manufacturing simplicity while enabling spoke pivotability, as the two-opening configuration allows the spoke to rotate within the radial extension space without requiring complex mechanisms.
Solution Approach 2:
The attachment opening extends in the radial direction, adding a dimensional element that provides space for spoke pivotability. This radial extension allows the spoke to pivot while maintaining a simple circular opening structure that is easy to manufacture, thereby achieving both simplicity and adaptability.
Data Source
AI summary
A bicycle hub comprises a tubular body and a spoke attachment part. The tubular body has a rotational axis. The spoke attachment part includes an attachment opening through which a spoke is to extend. The attachment opening includes a first end opening through which the spoke is to extend, and a second end opening through which the spoke is to extend. The second end opening is provided outward of the first end opening in a radial direction perpendicular to the rotational axis. The second end opening has a first maximum length and a second maximum length. The first maximum length is defined in a circumferential direction defined about the rotational axis. The second maximum length is defined in an axial direction parallel to the rotational axis. The first maximum length is larger than the second maximum length.