Rolling Bearing Holder Structure for Strain Sensing Without Rigidity Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The rigidity of a shaft inserted into a rolling bearing holder unit is compromised due to the placement of a strain gauge, which affects the structural integrity and functionality of the unit.
Innovation Solution
A rolling bearing holder unit design featuring a bearing holder with a thick and thin part, where the strain gauge is placed on the thin part, and the thick part is positioned to contact a region with significant displacement, ensuring the strain is transmitted effectively while maintaining shaft rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a strain gauge is placed in the bearing holder, then strain detection is enabled, but the rigidity of the shaft is reduced
Solution Approach 1:
The bearing holder is designed with different thickness regions: a thin part where the strain gauge is placed to enable strain detection, and a thick part that contacts the region from the intersection of the contact angle straight line to the preloaded end surface to maintain shaft rigidity. This local differentiation allows simultaneous achievement of measurement capability and structural strength.
2Measurement precision
If the bearing holder is made thinner to accommodate the strain gauge, then strain detection accuracy improves, but the structural integrity deteriorates
Solution Approach 1:
The bearing holder employs varying thickness locally: the thin part accommodates the strain gauge for accurate strain detection, while the thick part maintains structural integrity by contacting the critical load-bearing region. This resolves the contradiction between measurement accuracy and structural stability.
Solution Approach 2:
The bearing holder is segmented into functionally distinct regions (thin part for sensing, thick part for structural support), allowing each segment to optimize its specific function without compromising the overall system performance.
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 design reduces the decrease in shaft rigidity caused by the strain gauge placement, ensuring the structural integrity and facilitating accurate strain detection while allowing for easy maintenance.
Implementation Method 1
a strain gauge with a resistor that is configured to detect a strain of the outer ring or the inner ring
Data Source
AI summary
A rolling bearing holder unit disclosed herein includes: a rolling bearing with a predetermined rotation axis, the rolling bearing including: an outer ring; an inner ring placed inward relative to an inner circumferential surface of the outer ring to be coaxial with the outer ring; and a plurality of rolling bodies placed between the outer ring and the inner ring; a bearing holder placed in contact with an outer circumferential surface of the outer ring or an inner circumferential surface of the inner ring in the rolling bearing; and a strain gauge with a resistor that is configured to detect a strain of the outer ring or the inner ring. In this rolling bearing holder unit: the bearing holder has a thick part and a thin part that is thinner than the thick part; the strain gauge is placed on the thin part; the rolling bearing is preloaded to form a predetermined contact angle; and the thick part is placed in contact at least with a region extending from an intersection of a straight line indicating the predetermined contact angle and the outer circumferential surface of the outer ring or the inner circumferential surface of the inner ring, to a preloaded end surface, the preloaded end surface being an end surface of the outer ring or the inner ring located nearer to the intersection.