Sensor Bearing Unit Mounting for Eccentricity Alignment
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Solution Overview
Problem
The non-concentric axis centers of the magnetized target and inner ring in sensor bearing units affect measurement accuracy, leading to suboptimal performance.
Innovation Solution
A method involving measuring eccentricities E1 and E2, aligning and securing the target holder of the impulse ring within a groove to minimize the total eccentricity Etotal, ensuring concentric alignment and improved measurement accuracy without increasing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the target holder is simply secured into the groove without alignment adjustment, then the mounting process is simple and fast, but the measurement accuracy deteriorates due to non-concentric axis centers
Solution Approach 1:
The patent applies preliminary action by measuring the eccentricities E1 and E2 before mounting, and calculating the optimal angular position in advance. This allows the target holder to be positioned correctly from the beginning, ensuring measurement accuracy without requiring complex adjustment mechanisms during installation.
Solution Approach 2:
The patent replaces complex mechanical alignment mechanisms with a calculation-based approach. Instead of using mechanical devices to ensure concentricity, the method calculates the optimal angular position based on measured eccentricities and uses this information to guide the mounting process, simplifying the overall system while maintaining precision.
2Measurement precision
If the target holder is adjusted to minimize eccentricity, then measurement accuracy is improved, but the mounting time and process complexity increase
Solution Approach 1:
The patent applies self-service by having the mounting process itself generate the alignment information through eccentricity measurements. The measured values E1 and E2 are used directly to determine the optimal angular position, eliminating the need for separate alignment procedures or external reference systems, thus reducing time loss while improving accuracy.
Solution Approach 2:
The patent uses feedback by measuring the actual eccentricities E1 and E2 during the mounting process and using these measurements to determine the optimal angular position. This closed-loop approach ensures that the final positioning is based on actual measured data rather than theoretical calculations alone, improving accuracy while keeping the process efficient.
3Measurement precision
If high measurement accuracy is achieved through precise alignment, then signal quality improves, but manufacturing costs increase
Solution Approach 1:
The patent applies parameter changes by transforming the alignment problem from a geometric constraint into a calculable parameter optimization. By measuring eccentricities and calculating the optimal angular position, the method achieves high signal quality through parameter optimization rather than through expensive precision manufacturing or specialized components.
Solution Approach 2:
The patent uses copying by creating a mathematical model of the actual geometric relationships based on measured eccentricities. This model is then used to determine the optimal angular position, allowing high measurement accuracy to be achieved through information copying and calculation rather than through expensive physical precision mechanisms.
Data Source
AI summary
A method for mounting a sensor bearing unit providing a bearing and an impulse ring provided with a target holder and with a target mounted on an axial portion of the target holder. The method including measuring an eccentricity E1 between the target and the axial portion of the target holder, measuring an eccentricity E2 between a groove made in the bore of an inner ring of the bearing and the bore, introducing the target holder inside the groove, turning the target holder inside the groove to an angular position in which the eccentricity Etotal between the target and the bore of the inner ring is less than or equal to a predetermined value which is lower than the sum of the eccentricities E1 and E2, and securing the target holder inside the groove of the inner ring at the angular position.