Bicycle Wheel Unit Hub Sensor Ring Integration
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Solution Overview
Problem
Existing bicycle wheel units face challenges in efficiently detecting rotational speed and managing limited installation space, especially when integrating sensors and brake discs, which affects their performance and stability.
Innovation Solution
A wheel unit design that incorporates a sensor ring adjacent to a brake disc on the hub, allowing for compact installation and stable mounting, with an optional intermediate layer for noise reduction and corrosion protection, and a periodically varying sensing region to enhance sensor detection capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor ring is added to the hub for rotational speed detection, then measurement precision is improved, but device complexity increases and installation space is reduced
Solution Approach 1:
The sensor ring is integrated with the brake disc by mounting it on the same hub surface, combining two separate components (sensor ring and brake disc) into a compact arrangement that shares installation space and structural support
Solution Approach 2:
The hub surface is designed to accommodate multiple components (brake disc and sensor ring) simultaneously, serving both braking and rotational speed detection functions from a single installation location
2Measurement precision
If a sensor ring is mounted on the hub, then measurement precision is improved, but the available installation space is reduced
Solution Approach 1:
The sensor ring is positioned in the axial direction adjacent to the brake disc, utilizing the third dimension (depth/height) of the hub rather than competing for radial or lateral space, thereby accommodating both components within the existing hub envelope
3Area of stationary object
If the sensor ring is placed adjacent to the brake disc, then installation space is optimized, but noise generation and corrosion risk increase
Solution Approach 1:
A damping layer is introduced between the sensor ring and brake disc to serve as an intermediary element that absorbs noise vibrations and provides corrosion protection, while maintaining the compact axial arrangement of the components
Data Source
AI summary
In order to improve a wheel unit for a bicycle, comprising a hub and a wheel rim, which is arranged rotatably about an axis of rotation, wherein the hub and the wheel rim are connected to one another by spokes, it is proposed to arrange a brake disc and a sensor ring comprising a sensing region on the hub and to arrange the sensor ring adjacent to the brake disc.