Modular Involute Gear Artifact for Large-Gear Traceable Metrology
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Solution Overview
Problem
Existing involute gear artifacts with large base circle radii face challenges in precision stability, structural bulkiness, and transportation difficulties, hindering the establishment of a traceable metrology system for large-diameter gears.
Innovation Solution
An involute gear profile artifact with a large base circle radius is designed, featuring six surfaces for precise spatial positioning, including involute gear profile cylindrical surfaces, datum surfaces, and alignment surfaces, ensuring high precision and stability while maintaining a compact structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large base circle radius is used in the involute artifact to calibrate large gear measuring instruments, then the measurement traceability is improved, but the artifact size and weight increase significantly
Solution Approach 1:
The artifact is divided into a modular structure consisting of a base circle component and an involute gear profile component that can be assembled and disassembled. This segmentation allows the artifact to achieve large base circle radius for measurement traceability while keeping individual components manageable in size and weight.
Solution Approach 2:
The invention transitions from a traditional solid large-diameter artifact to a modular assembled structure, effectively changing the dimensional approach. Instead of creating one large artifact, the solution uses multiple smaller components that assemble to achieve the required large base circle radius, making transportation and handling feasible.
2Measurement precision
If a large base circle radius is used in the involute artifact, then the calibration capability for large gears is improved, but the structural complexity and bulkiness increase
Solution Approach 1:
The artifact employs segmentation by separating the base circle function from the involute gear profile function into distinct modular components. This reduces structural complexity while maintaining the large base circle radius needed for calibration capability.
Solution Approach 2:
The modular components are designed with universal interfaces and standardized features that can be reused across different artifact configurations. This multi-functionality reduces overall structural complexity while preserving the large base circle radius for calibration.
3Measurement precision
If a large base circle radius is used in the involute artifact, then the measurement traceability for large gears is improved, but the transportation and installation difficulty increase
Solution Approach 1:
The artifact is segmented into transportable modular components that can be moved separately and assembled at the measurement location. This maintains measurement traceability through the large base circle radius while dramatically improving transportation ease.
Solution Approach 2:
The artifact transitions from a static monolithic structure to a dynamic modular assembly that can be configured, transported, and reconfigured as needed. This dynamic approach enables easy transportation while preserving the large base circle radius for measurement traceability.
Data Source
AI summary
An involute gear profile artifact for large gear traceable metrology includes six surfaces, including an involute gear profile cylindrical surface for parameter transfer, a datum bottom surface and a datum top surface that are symmetrically arranged on upper and lower sides, a root datum surface and a tip datum surface that are arranged in parallel on front and rear sides, and an alignment datum surface oppositely arranged relative to the involute gear profile cylindrical surface; and a distance from the root datum surface to a corresponding base circle center is a design distance D. The artifact can meet the traceability requirements of the values of the large gear. The artifact makes up for the lack of standard measuring instrument in a traceable metrology system for a large-diameter involute gear, and improves a value traceability system for the large gear with a diameter greater than 500 mm.