Segmented Roller Bearing Cage for High-Speed Alignment
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Solution Overview
Problem
High-speed mechanical bearings experience deformation and misalignment of rolling elements due to centrifugal forces, leading to poor guiding and potential structural failures, as existing solutions either increase mass or fail to maintain proper kinematics at high speeds.
Innovation Solution
A mechanical bearing with a cage segmented into disjointed tubular portions, each independent of the others, preventing the transmission of centrifugal forces and maintaining roller alignment through controlled kinematics, thereby reducing global deformation and enhancing rotational guiding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the cage is made of a more resistant material with substantial sections in solicited zones, then the deformation of the cage linked to centrifugal forces is limited, but the mass of the cage increases and generates more substantial centrifugal forces
Solution Approach 1:
The cage is divided into multiple independent cage portions (typically 2-4 segments) that are arranged coaxially between the inner and outer rings. Each cage portion houses some rolling elements and is independent of the others, preventing the transmission of centrifugal forces between segments. This segmentation allows each portion to be optimized for its specific load conditions without requiring excessive mass throughout the entire cage structure.
2Stability of the object's composition
If the cage is replaced by a set of independent inserts arranged between each pair of rolling elements, then the problem of deformation due to centrifugal effects is overcome, but the rolling elements are not sufficiently maintained and have random kinematics at high speed
Solution Approach 1:
The cage is segmented into multiple independent cage portions that maintain rolling elements through controlled kinematics. Each cage portion is designed with guiding surfaces that constrain rolling element movement, preventing random kinematics while remaining independent to avoid force transmission. This segmentation with controlled independence resolves the contradiction between deformation prevention and reliable guidance.
Solution Approach 2:
The cage portions act as intermediaries between the rolling elements and the inner/outer rings, providing controlled guidance without rigid connection. Each cage portion mediates the interaction between rolling elements, maintaining their positions and kinematics through designed contact surfaces while preventing direct force transmission between segments.
3Ease of manufacture
If the cage is segmented into portions that are assembled well to transmit forces, then manufacturing is facilitated, but the forces applied on one portion are transmitted to the other and the cage deforms globally
Solution Approach 1:
The cage is segmented into multiple independent cage portions that can be manufactured separately using injection moulding or other fabrication techniques, facilitating ease of manufacture. The key innovation is that these portions are deliberately designed NOT to transmit forces between them - they are independent segments that maintain rolling elements without rigid force transmission, thus avoiding global deformation while preserving manufacturing advantages.
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
The solution effectively reduces cage deformation and centring forces, maintaining roller alignment and improving rotational guiding capabilities at high speeds while preventing structural failures like ruptures and ovalization.
Implementation Method 1
at a high rotating speed, the rolling elements housed in the cage undergo a substantial centrifugal force. These centrifugal forces are not equivalent across the entire periphery of the cage and generate high stresses at certain zones of the cage.
Implementation Method 2
the cage portions are arranged coaxially between the inner ring and the outer ring and are independent from one another. The cage portions effectively make it possible to maintain the rolling elements separated and overcome the problem of deformation of the cage due to the centrifugal effects.
Data Source
Figure 1
Figure 2~3
AI summary
The cylindrical roller bearing (2) comprises an outer ring (4) and an inner ring (6), centred on the same bearing axis (X2), the outer ring being arranged radially around the inner ring, and a cage, arranged coaxially between the inner ring and the outer ring and housing cylindrical rollers (10), with this cage being formed by several disjointed tubular portions (8A, 8B, 8C, 8D) which, in the assembled state of the bearing, are separated from each other by a non-zero gap (11). In particular, the cage is formed by at least three disjointed tubular portions that do not cooperate mechanically with each other in assembled state of the bearing.