Sensor Bearing Impulse Ring Locking Against Rotational Loosening
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Solution Overview
Problem
Sensor bearing units face issues with the angular mechanical connection between the impulse ring and the inner ring becoming loose due to high speeds, thermal dilatation, or mechanical loads, leading to inaccurate signal measurements.
Innovation Solution
The implementation of anti-rotation means on the target holder of the impulse ring, which cooperate with complementary anti-rotation means on the shaft to prevent angular movement, ensuring a secure angular connection through radial protrusions and recesses, and axial press-fitting of the target holder to the inner ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the impulse ring is secured to the inner ring using conventional anti-rotation means (crimping or fixing sleeve), then the angular connection is maintained under normal conditions, but the connection becomes loose under high speeds, thermal dilatation, or high mechanical loads
Solution Approach 1:
The invention transitions from conventional 2D anti-rotation means (crimping or fixing sleeve) to 3D protruding anti-rotation means that extend radially inward into the inner ring. This dimensional change creates a more robust mechanical interlock that resists loosening under high speeds, thermal dilatation, and mechanical loads by engaging multiple spatial dimensions rather than relying solely on circumferential abutment.
Solution Approach 2:
The anti-rotation means are designed with protrusions that extend radially inward into the inner ring before assembly, creating pre-established mechanical engagement. This preliminary positioning ensures that the impulse ring and inner ring are locked together from the outset, preventing any potential loosening that could occur with conventional post-assembly securing methods.
2Reliability
If the anti-rotation means extend radially inwards into the inner ring, then rotational misalignment is prevented, but the device complexity increases
Solution Approach 1:
The invention merges the anti-rotation function directly into the target holder structure by integrating protruding anti-rotation means with the target holder body. This consolidation eliminates the need for separate anti-rotation components (such as additional sleeves or crimping mechanisms), thereby preventing rotational misalignment while avoiding excessive increase in device complexity through functional integration.
3Ease of manufacture
If conventional fixing methods (crimping or fixing sleeve) are used, then the target holder is secured to the inner ring, but the connection may become loose leading to inaccurate signal measurements
Solution Approach 1:
The anti-rotation means are designed with protrusions that extend radially inward into the inner ring before assembly, creating pre-established mechanical engagement. This preliminary positioning ensures that the impulse ring and inner ring are locked together from the outset, preventing any potential loosening that could occur with conventional post-assembly securing methods.
Data Source
AI summary
The sensor bearing unit provides a bearing having an inner ring and an outer ring centered on an axis, the inner ring mounted on a shaft, and an impulse ring provided with a target holder and with a target mounted on the target holder, the target holder being secured to the inner ring. The target holder includes anti-rotation features adapted to cooperate with complementary anti-rotation features of the shaft so as to prevent angular movement of the impulse ring relative to the shaft by abutment in circumferential direction.