Sensor Bearing Unit Magnetization for Low Pitch Deviation
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Solution Overview
Problem
Classical manufacturing methods for sensor bearing units result in significant degradation of total pitch deviation due to concentricity defects in the groove of the inner ring, leading to reduced measurement accuracy.
Innovation Solution
A method involving securing the target holder to the first ring and magnetizing the magnetic target after assembly, which limits the degradation of total pitch deviation by ensuring precise alignment and magnetization of North and South poles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the groove is soft turned and heat treatment is applied before magnetization, then the manufacturing process is simplified, but the total pitch deviation degrades due to concentricity defects
Solution Approach 1:
The groove is precisely machined to final dimensions before the target holder is installed, ensuring that the concentricity is established early in the process. This preliminary precise machining prevents subsequent degradation of pitch deviation that would occur if machining were done after assembly.
Solution Approach 2:
The manufacturing process is divided into distinct sequential stages: first precise groove machining, then target holder installation, followed by magnetization. This segmentation allows each operation to be optimized independently, maintaining precision while simplifying the overall process flow.
2Measurement precision
If the target holder is secured before magnetization, then the magnetic poles are precisely aligned with the bearing, but the concentricity defect in the groove causes pitch deviation degradation
Solution Approach 1:
The groove is pre-machined with high precision before the target holder is installed, establishing the correct concentricity and alignment references early. This preliminary action ensures that when the target holder is secured and magnetization occurs, the magnetic poles are precisely aligned without subsequent pitch deviation degradation.
3Productivity
If magnetization is performed before assembling the target holder, then the magnetic target is ready in advance, but the alignment with the bearing becomes imprecise
Solution Approach 1:
The groove is pre-machined with high precision before the target holder is installed, establishing the correct concentricity and alignment references early. This preliminary action ensures that when the target holder is secured and magnetization occurs, the magnetic poles are precisely aligned without subsequent pitch deviation degradation.
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
This method improves the measurement accuracy of sensor bearing units by minimizing total pitch deviation, as demonstrated by reduced values in both radial and axial measurements compared to conventional methods.
Implementation Method 1
b) magnetizing the magnetic material of the magnetic target after the step of securing the target holder to the first ring
Data Source
AI summary
The method provides for the manufacturing a sensor bearing unit including a bearing having a first ring and a second ring capable of rotating concentrically relative to one another, and an impulse ring provided with a target holder secured to the first ring and with a magnetic target mounted on the target holder. The method further includes securing the target holder to the first ring, and magnetizing the magnetic material of the magnetic target after the step of securing the target holder to the first ring.