Monolithic Angle Scaling Body with Reduced Crosspiece
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Solution Overview
Problem
Conventional angle-measurement systems face challenges in achieving precise rotational position measurements due to high demands on mounting surfaces and sensitivity to dimensional tolerances and deformations, leading to inaccuracies and reduced torsional stiffness.
Innovation Solution
A monolithic body with a specific geometrical design featuring a first annular region for connection, a second annular region with angle scaling, and a crosspiece region with a significantly smaller axial extension, minimizing deformations and maintaining torsional stiffness, allowing for precise measurements even with imprecise mounting surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the body has a conventional design with larger crosspiece region, then the mounting is easier and the structure is simpler, but the measuring accuracy deteriorates due to deformations in the axial direction and radial direction
Solution Approach 1:
The body is designed with non-uniform cross-sectional geometry along its axial length. The crosspiece region has a smaller cross-section than the end regions, creating local variations in stiffness that minimize deformations at critical measurement locations while maintaining ease of mounting at the ends. This local quality differentiation resolves the contradiction by optimizing the structure for measurement precision where needed without sacrificing mounting simplicity.
2Measurement precision
If the mounting surfaces have high dimensional tolerances, then the manufacturing is easier and cost is lower, but the measuring accuracy deteriorates due to deformations
Solution Approach 1:
The design accepts that mounting surfaces will have dimensional tolerances and manufacturing variations, but structures the body geometry so that these variations occur in non-critical regions. The crosspiece region's minimized cross-section ensures that deformations from tolerance variations do not propagate to the angle scaling region, effectively converting the potential harm of loose tolerances into a non-issue for measurement accuracy.
3Strength
If the crosspiece region has larger axial extension, then the torsional stiffness is reduced, but the manufacturing is simpler and the structure is more robust
Solution Approach 1:
The body is segmented into regions with different cross-sectional characteristics along the axial direction. The crosspiece region is deliberately designed with a smaller cross-section compared to the end regions, creating a segmented stiffness distribution. This segmentation allows the body to maintain high torsional stiffness where needed (in the angle scaling region) while remaining manufacturable through standard processes, resolving the contradiction between strength and ease of manufacture.
Data Source
AI summary
A monolithic body having angle scaling is rotatable about an axis to measure the rotational position of a machine part. The body has a first annular region which has a flange-type configuration for connection to the machine part, and a second annular region on which the angle scaling is arranged, as well as a crosspiece region. The crosspiece region is arranged between the first annular region and the second annular region. The crosspiece region has a geometrical extension in the direction of the axis which is at least three times smaller than the greatest geometrical extension of the second annular region in the direction of the axis (Z).