Sensor Wheel Radial Opening Design for Detector Positioning
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Solution Overview
Problem
Existing sensor wheels for human-powered vehicles face challenges in accommodating detectors with varying radial positions due to limited radial area for rotation information detection, which restricts their flexibility and compatibility with different vehicle configurations.
Innovation Solution
The sensor wheel design features a wheel body with multiple openings spaced circumferentially, each with a radial length equal to or greater than 8 mm, allowing for a larger radial area for detector placement, enhancing flexibility in relative positioning and compatibility with various human-powered vehicle setups, including those with disc brake rotors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the radial area for detector arrangement is enlarged, then the flexibility and compatibility with different radial positions is improved, but the device complexity increases
Solution Approach 1:
The sensor wheel is divided into multiple openings spaced circumferentially, with each opening having a specific radial length. This segmentation allows the detector to be positioned at different radial locations while maintaining detection functionality, as each opening serves as an independent detection zone.
Solution Approach 2:
The patent extends the radial dimension of the openings to create a larger radial area for detector arrangement. By increasing the radial length of openings (at least one opening has a radial length equal to or larger than 8 mm), the system gains flexibility in the radial direction without compromising the circumferential detection function.
2Adaptability or versatility
If the radial length of openings is increased to accommodate different detector positions, then the adaptability to various vehicle configurations is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a minimum radial length parameter (equal to or larger than 8 mm) for at least one opening, which provides a standardized dimension that balances adaptability with manufacturability. This parameter change allows for tolerance in detector positioning while ensuring functional detection across different radial positions.
Solution Approach 2:
The sensor wheel design with multiple openings of sufficient radial length serves multiple functions: it accommodates detectors at various radial positions, maintains rotational detection capability, and works with different vehicle configurations. This universal design reduces the need for precision customization for each application.
3Reliability
If multiple openings with sufficient radial length are provided, then the detection reliability is improved, but the amount of material removed from the wheel body increases
Solution Approach 1:
The patent requires at least one opening to have a radial length equal to or larger than 8 mm, which is sufficient to ensure reliable detection without requiring all openings to have maximum dimensions. This partial action approach maintains detection reliability while minimizing material removal compared to making all openings equally large.
Solution Approach 2:
Different openings can have different radial lengths, with at least one opening optimized for detection reliability (radial length ≥ 8 mm) while other openings can be smaller. This local quality differentiation ensures reliable detection functionality while reducing overall material removal from the wheel body.
Data Source
AI summary
A sensor wheel for a human-powered vehicle comprises a wheel body and an attachment part. The wheel body is configured to be rotatable relative to a vehicle body of the human-powered vehicle about a rotational axis along with a rotational hub of the human-powered vehicle. The wheel body includes a plurality of openings spaced apart from each other in a circumferential direction with respect to the rotational axis. The attachment part is configured to be operatively coupled to the rotational hub. At least one opening of the plurality of openings has a radial length defined radially with respect to the rotational axis. The radial length is equal to or larger than 8 mm.