Crown Ball Bearing Cage Structure for High-Speed Deformation Control
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Solution Overview
Problem
Existing ball bearing cages deform and experience stress during high-speed rotation, leading to wear, vibration, and heat generation due to insufficient rigidity and deformation suppression.
Innovation Solution
A crown cage design with a spherical concave pocket and pillar portions featuring a reduced inner circumferential distance and reinforced connections to reduce stress and deformation, utilizing resin materials with fiber reinforcement and specific geometric configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the cage is made lighter by reducing material, then deformation during high-speed rotation is reduced, but the strength and rigidity of the cage are insufficient leading to contact with outer ring and shield plates
Solution Approach 1:
The cage is made from a composite material consisting of a polyamide resin base and embedded glass fibers. The glass fibers reinforce the resin matrix, providing both strength and rigidity while maintaining lightweight characteristics. This composite structure allows the cage to resist deformation during high-speed rotation without increasing overall weight, preventing contact with the outer ring and shield plates.
Solution Approach 2:
The cage is divided into multiple functional sections: a body portion with reduced wall thickness for weight reduction, and reinforced rib portions extending from the body. The ribs are strategically positioned to provide structural support and maintain rigidity in critical areas. This segmentation allows different regions of the cage to have optimized thickness - thinner where weight reduction is prioritized, and thicker where structural support is needed.
2Stability of the object's composition
If the cage wall thickness is reduced to suppress deformation, then centrifugal force expansion is reduced, but the stress resistance and durability of the cage are insufficient
Solution Approach 1:
The cage structure is segmented into a thin-walled body portion and thickened rib portions. The body portion has reduced wall thickness to minimize centrifugal force expansion and deformation during high-speed rotation. The rib portions extend from the body in the axial direction and are positioned to provide localized reinforcement. This segmentation maintains shape stability while ensuring durability through strategic reinforcement.
Solution Approach 2:
Different regions of the cage have different wall thicknesses optimized for their specific functions. The body portion has thinner walls for weight reduction and deformation suppression, while the rib portions have greater thickness for strength and stress resistance. This local quality variation allows the cage to achieve both shape stability during rotation and sufficient durability to prevent failure under stress.
3Ease of manufacture
If the cage is designed with simplified structure, then manufacturing ease is improved, but the rigidity and deformation suppression capability are insufficient
Solution Approach 1:
The cage is designed as an integrated molded piece with segmented functional features - the body portion and rib portions are formed as a single unit through injection molding. The ribs extend naturally from the body with optimized geometry for structural support. This integrated segmentation provides complex rigidity-enhancing geometry without requiring multiple assembly steps, maintaining ease of manufacture while achieving the necessary rigidity to prevent deformation during high-speed operation.
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 design effectively suppresses cage deformation and stress, preventing contact with the outer ring and shield plates, thereby reducing wear, vibration, and heat generation during high-speed operation.
Implementation Method 1
the stress may act on the cage 100 by the centrifugal force during the high-speed rotation
Implementation Method 2
utilizing resin materials with fiber reinforcement
Implementation Method 3
a pocket formed between the adjacent pillar portions and having a spherical concave surface having a spherical shape capable of holding a ball
Implementation Method 4
a distance from an inner circumferential surface of the pocket to a center of the crown cage for a ball bearing is smaller than a radius of an inner circumferential surface of the pillar portion
Data Source
AI summary
A crown cage for a ball bearing includes an annular main portion, pillar portions protruding in an axial direction at predetermined intervals in a circumferential direction from the main portion, and a pocket formed between the adjacent pillar portions and having a spherical concave surface having a spherical shape capable of holding a ball. The pillar portion includes a pair of claw portions having tip end portions arranged at intervals therebetween and a connection portion connecting the claw portions. An inlet portion having a width shorter than a diameter of the ball and for inserting the ball is provided between the tip end portions of the two adjacent claw portions configuring the pocket. A distance from an inner circumferential surface of the pocket to a center of the crown cage for a ball bearing is smaller than a radius of an inner circumferential surface of the pillar portion.