Two-Part Bicycle Hub Rotor for Stable Freewheel Support
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Solution Overview
Problem
Conventional hubs for muscle-powered vehicles, such as bicycles, lack sufficient structural stability, which can lead to reduced reliability and performance under varying loads and stresses.
Innovation Solution
A hub and rotor design featuring a hollow hub axle with axially spaced hub and rotor bearings, and a freewheel device with toothed disk devices biased by spring mechanisms, allowing for a flexible and robust configuration with enhanced support and centering, enabling precise guidance and rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional hub designs are used, then the structure is simpler, but the structural stability is insufficient
Solution Approach 1:
The rotor is divided into two separate rotor parts (first rotor part and second rotor part) that are connected together. This segmentation allows each part to be optimized independently for specific functions (bearing accommodation, toothed disk device mounting) while collectively providing enhanced structural stability compared to a conventional one-piece rotor design.
Solution Approach 2:
The toothed disk device is nested within the rotor structure, specifically mounted on the first rotor part and interacting with the hub shell through the rotor. This nested arrangement integrates multiple functions (power transmission, structural support) into a compact configuration, improving structural stability without proportionally increasing overall device complexity.
2Adaptability or versatility
If the rotor is made as one piece, then the structure is simpler, but the configuration flexibility is reduced
Solution Approach 1:
The rotor is segmented into two rotor parts that can be independently designed and manufactured. The first rotor part can accommodate the toothed disk device while the second rotor part accommodates the bearings, allowing flexible configuration optimization without requiring a completely custom one-piece design for each application.
Solution Approach 2:
The two rotor parts are connected in a manner that allows for controlled relative movement or adjustment, enabling the rotor assembly to adapt to different operational conditions and loading scenarios while maintaining rotational integrity.
3Stability of the object's composition
If wall thicknesses are increased for stability, then structural stability improves, but manufacturing precision requirements increase
Solution Approach 1:
By dividing the rotor into two parts, each part can be manufactured with optimized wall thicknesses appropriate for its specific function, rather than requiring the entire rotor to have uniformly thick walls. This reduces the overall manufacturing precision requirements while maintaining structural stability.
Solution Approach 2:
Different rotor parts can have different wall thicknesses and material properties optimized for their local requirements. The first rotor part can have thicker walls where structural stability is critical, while the second rotor part can have thinner walls where less structural support is needed, reducing overall manufacturing complexity and precision requirements.
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 design provides increased structural stability, reliability, and flexibility, allowing for precise guidance and rotation, thereby improving the overall performance and durability of muscle-powered vehicles.
Implementation Method 1
biased to an engagement position by means of at least one biasing device
Data Source
AI summary
A bicycle hub with a rotor, including a rotor body, extending from an inner end toward an outer end, wherein the rotor body is rotatably supported on the hub axle with a hub-side rotor bearing and an opposite, outer rotor bearing. The rotor includes a rotor-side toothed disk device coupled with the rotor body, to fixedly, drivingly couple the rotor body with a hub shell, and to decouple from a hub shell when freewheeling. The rotor-side toothed disk device includes an end toothing engaging an end toothing coupled with the hub shell. The rotor-side toothed disk device is biased to an engagement position. The rotor body includes a first rotor part and a second rotor part connected with the first rotor part in a drivingly, rotationally fixed manner. One rotor bearing is on one of the rotor parts and the other rotor bearing is on the other rotor part.