Segmented Roller Bearing Cage Tongue-and-Groove Stability
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Solution Overview
Problem
Existing roller bearing cages are prone to instability under sudden loads and uneven heating, leading to rolling elements losing contact and colliding, which can result in damage and premature failure, and current segmented cage designs either lack stability or require complex and costly manufacturing processes.
Innovation Solution
A segmented cage design where each cage segment has a frame-like structure with side plates that prevent pivoting and are connected through a stable tongue-and-groove mechanism, allowing for assembly into cages of various diameters with a solid, load-bearing connection that maintains rolling element position under peak loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a segmented cage is manufactured in molds and assembled on machine tools to reduce manufacturing effort, then the manufacturing complexity is reduced, but the cage size remains large and requires expensive equipment
Solution Approach 1:
The cage is divided into multiple cage segments that can be manufactured separately using simple injection molding processes, then assembled together. This segmentation allows each segment to be produced with basic equipment rather than requiring large-capacity machine tools, while still forming a complete functional cage structure when assembled.
Solution Approach 2:
The invention transitions from manufacturing the entire cage as a single large component requiring expensive equipment to producing multiple smaller segments that can be manufactured with simple injection molding machines. The assembly of these segments in a different dimensional approach (modular construction) eliminates the need for large-capacity manufacturing equipment.
2Ease of manufacture
If U-shaped sheet metal profiles are used as cage segments to reduce manufacturing complexity, then the manufacturing effort is reduced, but the cage stability under radial forces is insufficient
Solution Approach 1:
The cage segments are constructed as composite structures combining a U-shaped sheet metal profile with a reinforcing element (such as a steel insert or reinforcement rib). This composite design maintains the manufacturing simplicity of the sheet metal profile while adding the radial strength and stability of the reinforcing material, preventing cage deformation under load.
Solution Approach 2:
The invention introduces curved or arc-shaped reinforcing elements within the U-shaped profiles that distribute radial forces more effectively. The curved geometry provides structural rigidity and resistance to radial deformation while maintaining compatibility with the sheet metal construction approach.
3Stability of the object's composition
If a solid steel ring is added to connect U-shaped cage segments to improve radial force resistance, then the cage stability is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The reinforcing element is merged directly into the injection molding process of the cage segment, eliminating the need for separate steel ring components. The reinforcement is formed as an integrated part of the plastic segment during molding, combining the structural benefits of metal reinforcement with the manufacturing simplicity of plastic injection molding, and avoiding additional assembly steps.
Solution Approach 2:
The invention replaces the mechanical assembly of separate steel rings with plastic segments with an integrated injection molding process that forms the reinforcement and cage segment as a single piece. This substitution eliminates the need for separate fastening operations and reduces manufacturing complexity while maintaining radial strength.
4Adaptability or versatility
If cage segments are connected in an articulated manner to allow assembly flexibility, then the adaptability to different diameters is improved, but the torque transmission and angular stability deteriorate
Solution Approach 1:
The cage segments are designed with elastic deformation capabilities that allow dynamic adjustment to different bearing diameters during assembly. The material and geometry are selected to provide controlled flexibility during assembly, enabling the cage to adapt to various diameters, while maintaining sufficient rigidity during operation to transmit torques and maintain angular stability.
Solution Approach 2:
The invention utilizes changes in material properties and geometric parameters of the cage segments to achieve adaptability. By carefully selecting plastic materials with appropriate elasticity and designing segment geometry with specific wall thicknesses and reinforcement distributions, the cage can be assembled with different diameters while maintaining operational stability and torque transmission capabilities.
Data Source
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AI summary
The invention relates to a roller bearing with a segmented cage for guiding the roller bodies. Said cage comprises an inner ring on which a plurality of roller bodies can roll, and which can also roll on an outer ring which is concentric to the inner ring, a cage consisting of several webs which are distributed in a uniform manner over the periphery and which are aligned parallel to each other and on the longitudinal axis of the cage and several lateral plates for joining the webs. Two webs and two lateral plates are securely joined together to form a cage segment consisting of a pocket for guiding a roller body and all the cage segments are securely joined together in pairs to form a closed cage therein.