Bearing Raceway Insert Repair for Localized Surface Damage
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Solution Overview
Problem
The existing approach of replacing worn rolling-element bearings with new ones is unsustainable and often unnecessary, as it does not extend the service life effectively, especially for large and expensive bearings, where repair methods are not commonly employed.
Innovation Solution
A method for repairing rolling-element bearings by disassembling, cleaning, and identifying damaged areas, then using CNC-controlled milling or grinding to create a cavity for inserting a prefabricated insert made from similar material, which is cooled and heated to achieve a press-fit, allowing the original race to be remanufactured, extending the service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a worn rolling-element bearing is replaced with a new complete bearing, then reliability is improved, but loss of substance and cost increase
Solution Approach 1:
The bearing is divided into separable components (outer ring, inner ring, rolling elements, cage). Only the damaged raceway surfaces are removed and replaced with inserts, while the remaining healthy bearing components are retained and reused, thus avoiding complete bearing replacement and reducing material waste
Solution Approach 2:
The damaged raceway regions are discarded (removed via milling/grinding), but the majority of the bearing components are recovered and reused. The discarded portions are replaced with new inserts, achieving repair without complete disposal of the bearing
2Reliability
If a worn rolling-element bearing is replaced with a new complete bearing, then reliability is improved, but cost increases
Solution Approach 1:
The expensive bearing is partially recovered by reusing the undamaged components (outer ring, inner ring, rolling elements, cage) after removing only the damaged raceway surfaces. This partial recovery significantly reduces the economic cost compared to complete bearing replacement
Solution Approach 2:
The physical state of the bearing components is changed through the repair process (removal of damaged surfaces, insertion of new raceway inserts, reassembly) to restore the bearing to serviceable condition, thereby extending its operational life without requiring complete replacement
3Reliability
If a worn rolling-element bearing is replaced with a new complete bearing, then reliability is improved, but duration of action decreases
Solution Approach 1:
The bearing components are recovered and reused after repairing the damaged raceway surfaces by removing them and installing new inserts. This recovery process extends the service life of the bearing components, allowing them to continue operation beyond their original service life
4Reliability
If a worn rolling-element bearing is replaced with a new complete bearing, then reliability is improved, but device complexity increases
Solution Approach 1:
The bearing is segmented into removable components, allowing the damaged raceway surfaces to be accessed and repaired independently while the rest of the bearing remains assembled. This segmentation enables targeted repair rather than complete replacement
Solution Approach 2:
Only the locally damaged raceway surfaces are removed and replaced with inserts, while the rest of the bearing components maintain their original condition. This localized repair approach simplifies the overall process compared to complete bearing replacement
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 extends the service life of rolling-element bearings by allowing for the repair of localized damage, reducing waste and costs associated with replacing entire bearings, while maintaining performance through proper reassembly and lubrication.
Implementation Method 1
which is cooled and heated to achieve a press-fit
Data Source
AI summary
A rolled-on-surface element of a rolling-element bearing assembly has a rolled-on surface configured to support a plurality of rolling elements, a cavity in the rolled-on surface having an opening smaller than 25% of a total area of the rolled-on surface, and an insert press-fit in the cavity such that an exposed surface of the insert forms a portion of the rolled-on surface. Also, a method of repairing a rolled-on surface of a rolled-on-surface element using an insert.