Sensor Bearing Unit Mounting for Target-to-Ring Concentricity
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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 for mounting a sensor bearing unit involves measuring eccentricities between the target and target holder, and the groove and ring surfaces, then adjusting the target holder's angular position to minimize the total eccentricity, ensuring secure placement within the groove to align centers optimally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the target holder is simply secured into the groove without angular adjustment, then the mounting process is simple and quick, but the measurement accuracy deteriorates due to non-concentric axis centers
Solution Approach 1:
The patent measures the eccentricities E1 and E2 before mounting, and calculates the optimal angular position in advance. This preliminary measurement and calculation enables the target to be positioned concentrically with the inner ring during the mounting process, resolving the contradiction between simple mounting and high measurement accuracy.
Solution Approach 2:
The patent uses measured eccentricity values E1 and E2 as feedback to determine the correct angular orientation of the target holder. By using these measurements to guide the mounting orientation, the system achieves concentric alignment and high measurement accuracy without requiring complex automated positioning systems.
2Measurement precision
If the target holder is adjusted to minimize total eccentricity, then the measurement accuracy improves, but the mounting time increases
Solution Approach 1:
The eccentricities E1 and E2 are measured beforehand, and the optimal angular position is calculated in advance using the formula involving the absolute difference between E1 and E2. This preliminary preparation eliminates the need for time-consuming trial-and-error adjustments during actual mounting, thus reducing mounting time while maintaining high accuracy.
Solution Approach 2:
The method uses the inherent geometric relationships and measured eccentricities to self-determine the correct mounting orientation. By relying on the calculated angular position derived from E1 and E2, the mounting process becomes more efficient without requiring external guidance or iterative adjustments.
3Manufacturing precision
If the target holder is secured without angular positioning, then the manufacturing process is simpler, but the spacing between target center and ring center increases
Solution Approach 1:
The patent measures eccentricities E1 and E2 during the manufacturing or assembly preparation phase, and calculates the optimal angular position beforehand. This allows the target holder to be oriented correctly before final securing, achieving high concentricity precision without requiring complex manufacturing processes or specialized tooling.
Solution Approach 2:
The patent changes the angular orientation parameter of the target holder based on the calculated optimal position derived from eccentricity measurements. By adjusting this angular parameter, the system achieves minimal spacing between target center and ring center, resolving the contradiction between manufacturing simplicity and precision.
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.