Uneven Bearing Cage Pockets for Quarter-Turn Steering
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Solution Overview
Problem
Conventional retaining cages for rolling bearings face deformation and damage in applications with low rotational speed or quarter-turn oscillations, where they experience heavy axial and radial loading, leading to insufficient movement freedom for rolling elements and installation difficulties.
Innovation Solution
A cage design with unevenly distributed pockets, featuring axial retention means in some pockets and none in others, allows for flexibility and reduced deformation by optimizing pocket spacing and using a single-piece polymer construction with recesses for mechanical flexibility and reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If axial retention means are provided in all pockets to ensure axial retention of the cage onto the rolling elements, then the cage retains the rolling elements effectively, but the cage experiences severe deformation and damage under heavy axial and radial loading in quarter-turn applications
Solution Approach 1:
The invention applies axial retention means (claws) only in specific pockets located in the unloaded sector, while leaving pockets in the heavily loaded sector without retention means. This local differentiation allows the cage to maintain adequate freedom of movement in loaded regions (reducing deformation) while still providing axial retention in unloaded regions where rolling elements need to be secured.
2Stability of the object's composition
If the cage structure is made rigid to resist deformation under heavy loading, then the cage maintains its shape, but the rolling elements do not have sufficient freedom to move, leading to severe local cage deformation
Solution Approach 1:
The cage is segmented into different functional zones: pockets with retention means for axial retention and pockets without retention means for allowing movement freedom. This segmentation enables different parts of the cage to serve different functions - maintaining stability where needed and allowing movement where required - resolving the contradiction between rigidity and flexibility.
3Reliability
If uniform axial retention is provided in all pockets, then the cage is retained evenly on the rolling elements, but the cage cannot adapt to quarter-turn applications with heavy loading in specific angular sectors
Solution Approach 1:
The invention creates local quality differences by providing retention means only in specific pockets suitable for unloaded sectors, while leaving pockets in loaded sectors without retention means. This allows the cage to adapt to quarter-turn applications by having different retention characteristics in different angular sectors, matching the non-uniform loading conditions.
4Strength
If the cage design includes retention means in all pockets, then the cage structure is complete and robust, but it becomes difficult to fit the cage over the balls during installation
Solution Approach 1:
The invention extracts the retention means (claws) from pockets in the heavily loaded sector, leaving these pockets without retention features. This removal of retention means from specific pockets reduces interference during installation, making it easier to fit the cage over the balls, while retention means remain in other pockets to maintain structural robustness.
Data Source
AI summary
A cage for a rolling bearing which cage is intended to ensure the circumferential spacing of a row of rolling elements and comprises first pockets 28 for first rolling elements of the row, which pockets are provided with axial retention means 38, 46 for the axial retention of the cage onto the said rolling elements, and second pockets 26 for the second rolling elements of the row, which pockets have no axial retention means for retaining the cage on the said rolling elements. The distribution of the first pockets 28 about the periphery of the cage is uneven.