Wheel Axle Strain Gauge Layout for Accurate Load Detection
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Solution Overview
Problem
Existing human-powered vehicle technologies lack effective methods for accurately detecting strain on shaft members and wheel axles, which is crucial for load calculation and vehicle performance analysis.
Innovation Solution
A shaft member with a setting surface featuring multiple setting portions at different circumferential positions, allowing for stable attachment and phased arrangement of strain gauges, along with wire grooves for electrical connections, enabling precise strain detection and improved output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain gauges are attached to a wheel axle without a dedicated setting surface, then the attachment structure is simple, but the strain detection accuracy is insufficient
Solution Approach 1:
The shaft member is divided into functional segments: a setting surface with multiple setting portions for strain gauge attachment, wire grooves for electrical connections, and a strain detection unit. This segmentation allows each component to perform its specific function optimally while maintaining overall system integration.
Solution Approach 2:
The setting surface and setting portions are pre-formed on the shaft member during manufacturing, preparing the structure in advance for strain gauge attachment. This preliminary preparation ensures accurate positioning and stable attachment without requiring complex post-processing or adjustment procedures.
2Measurement precision
If strain gauges are attached at a single position on the shaft member, then the attachment process is simple, but the strain detection comprehensiveness is limited
Solution Approach 1:
The setting portions are distributed across multiple circumferential positions (e.g., 0°, 90°, 180°, 270°) on the shaft member, transitioning from a single-point attachment to a multi-dimensional arrangement. This allows comprehensive strain detection from different orientations while maintaining systematic organization for ease of operation.
3Reliability
If wire grooves are not provided on the shaft member, then the manufacturing process is simpler, but the electrical connection reliability is reduced
Solution Approach 1:
The wire grooves are integrated directly into the shaft member structure during manufacturing, merging the electrical conduit function with the mechanical shaft component. This integration ensures reliable electrical connections for strain gauges while avoiding the need for separate wiring channels or assemblies.
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
Enables accurate detection of strain on human-powered vehicle components, enhancing load calculation and vehicle performance analysis by providing stable attachment for strain gauges and efficient electrical connections.
Implementation Method 1
a strain gauge is attached to a wheel axle
Data Source
AI summary
A shaft member is provided for a human-powered vehicle. The shaft member is configured to be attachable to a body of the human-powered vehicle in a manner restricting rotation relative to the body. The shaft member includes a setting surface on which a plurality of strain gauges are arrangeable. The setting surface includes a plurality of setting portions configured to allow for arrangement of one or more of the strain gauges. The setting portions are provided in the setting surface at different positions in a circumferential direction of the shaft member.