Rolling Bearing Strain Sensor Fixation for Durable High Sensitivity
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Solution Overview
Problem
The durability of the joint region between a rolling bearing and a contact-type strain sensor is compromised due to increased stress, making it difficult to achieve high sensitivity in strain detection while maintaining sensor durability.
Innovation Solution
A rolling bearing device with a strain sensor fixed to the peripheral surface at multiple locations, avoiding high-strain areas and using an intermediate member to indirectly join the strain gauge, which reduces stress and enhances durability through strategic fixation and absorption regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the strain sensor is fixed to the peripheral surface at multiple locations, then the durability of the joint region is improved, but the sensitivity of strain detection deteriorates
Solution Approach 1:
The strain sensor is divided into a detection region and non-detection regions. The non-detection regions are fixed to the peripheral surface at multiple locations, while the detection region remains unfixed to maintain sensitivity. This segmentation allows different parts of the sensor to serve different functions simultaneously.
Solution Approach 2:
Different regions of the strain sensor have different fixation states: the non-detection regions are fixed to the peripheral surface to improve durability, while the detection region is left unfixed to maintain high sensitivity for strain detection. This local differentiation resolves the contradiction between durability and sensitivity.
2Measurement precision
If the strain sensor is fixed to the part of the rolling bearing to which a large load is applied, then the sensitivity of strain detection is improved, but the durability of the joint region deteriorates
Solution Approach 1:
The strain sensor is segmented into a detection region and non-detection regions. The non-detection regions are positioned at locations subject to large loads and are fixed to the peripheral surface, providing durability in high-stress areas. The detection region is positioned to detect strain while remaining unfixed to maintain sensitivity.
Solution Approach 2:
The non-detection regions act as intermediaries that are fixed to the peripheral surface at high-load locations, transferring the mechanical connection to these robust areas while leaving the detection region unfixed. This allows the sensor to benefit from the structural strength of high-load areas without compromising detection sensitivity.
Data Source
AI summary
A rolling bearing device includes a rolling bearing that includes an outer ring having an inner peripheral surface on which a first raceway surface is provided, an inner ring having an outer peripheral surface on which a second raceway surface is provided, and rolling elements interposed between the first and the second raceway surfaces; a strain sensor configured to detect a strain of the rolling bearing; and a fixation portion configured to fix the strain sensor to a peripheral surface that includes at least one of an outer peripheral surface of the outer ring and an inner peripheral surface of the inner ring. The fixation portion fixes at least two locations in the strain sensor to the peripheral surface such that a detection region of the strain sensor and the peripheral surface are not fixed to each other, the at least two locations facing each other across the detection region.