Bicycle Hub Assembly Segmentation for Quick Rotor Detachment
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Solution Overview
Problem
Existing bicycle hub assemblies are difficult to remove and reattach due to being fixedly attached to disk brake rotors and sprockets, hindering efficient wheel repair and increasing the risk of improper installation.
Innovation Solution
A hub assembly design featuring first and second engagement structure pairs with non-mating shapes and indicia for easy identification, allowing for quick and secure attachment and detachment, reducing the likelihood of improper reassembly and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the hub assembly is fixedly attached to disk brake rotors and sprockets, then the structural stability is improved, but the ease of removal and reattachment deteriorates
Solution Approach 1:
The hub assembly is divided into separable components with distinct engagement structures. The hub shell contains first and second engagement structure pairs that can selectively engage with corresponding structures on brake rotors and sprockets, allowing the hub to be detached and reattached without permanent fixation.
Solution Approach 2:
The engagement structures transition from a static fixed attachment to a dynamic reversible connection. The protrusions and recesses can be engaged and disengaged on demand, enabling the hub assembly to switch between a stable connected state and a removable separated state based on operational needs.
2Stability of the object's composition
If the hub assembly is fixedly attached to disk brake rotors and sprockets, then the structural stability is improved, but the time required for wheel repair increases
Solution Approach 1:
The hub assembly is divided into separable components with distinct engagement structures. The hub shell contains first and second engagement structure pairs that can selectively engage with corresponding structures on brake rotors and sprockets, allowing the hub to be detached and reattached without permanent fixation.
Solution Approach 2:
The engagement structures are pre-configured with complementary protrusions and recesses that guide rapid alignment during attachment. This preliminary design of the engagement geometry enables quick connection without requiring complex alignment procedures or multiple adjustment steps during repair operations.
3Ease of manufacture
If the hub assembly uses simple engagement structures, then the ease of manufacture is improved, but the reliability of proper engagement deteriorates
Solution Approach 1:
The engagement structures use asymmetric protrusion and recess geometries that are complementary to each other. The first engagement structure pair has different asymmetric features than the second pair, creating unique mating patterns that ensure proper alignment and prevent incorrect assembly, while remaining manufacturable using standard machining processes.
Solution Approach 2:
Different local geometries are applied to different engagement structures. The first engagement structure pair has specific protrusion and recess characteristics tailored for one type of connection, while the second pair has different characteristics for another connection type, allowing each interface to be optimized for its specific function while maintaining overall manufacturing simplicity.
4Reliability
If the hub assembly uses non-mating shapes for engagement structures, then the reliability of proper engagement is improved, but the device complexity increases
Solution Approach 1:
The engagement structures use asymmetric protrusion and recess geometries that are complementary to each other. The first engagement structure pair has different asymmetric features than the second pair, creating unique mating patterns that ensure proper alignment and prevent incorrect assembly, while remaining manufacturable using standard machining processes.
Solution Approach 2:
The hub assembly is divided into separable components with distinct engagement structures. The hub shell contains first and second engagement structure pairs that can selectively engage with corresponding structures on brake rotors and sprockets, allowing the hub to be detached and reattached without permanent fixation.
Data Source
AI summary
A hub assembly for bicycle is provided. The hub assembly includes a hub shell having first and second ends at a distance from each other along a rotational axis, a first engagement structure pair having a first inner engagement structure and a first outer engagement structure, the first engagement structure pair being releasably engagable for co-rotation; and a second engagement structure pair having a second inner engagement structure and a second outer engagement structure, the pair being second engagement structure releasably engagable for co-rotation. The first inner engagement structure and the second outer engagement structure are configured not to engage with each other, and/or the second inner engagement structure and the first outer engagement structure are configured not to engage with each other.