Deep Groove Ball Bearing Structure for Pure Rolling Assembly
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Solution Overview
Problem
Deep groove ball bearings with cages experience sliding friction between rolling balls and the raceway due to cage friction, while full-ball bearings face issues with increased frictional resistance and risk of ball fall-off under axial forces, leading to short service life and assembly challenges.
Innovation Solution
A rolling deep groove ball bearing design featuring a bearing outer and inner ring with large rolling balls and special-shaped rollers arranged between them, where the rollers have a groove depth of 0.03 mm to 0.1 mm, and the distance between the rings is optimized to ensure pure rolling with minimal friction, high bearing capacity, and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deep groove ball bearing with cage is used, then the bearing structure is stable, but sliding friction occurs between rolling balls and raceway due to cage friction
Solution Approach 1:
The invention removes the cage component entirely from the bearing structure. By extracting the cage, the source of friction between cage and rolling balls is eliminated, allowing the rolling balls to contact the raceway directly without intermediate friction elements, thus achieving pure rolling motion while maintaining structural stability through alternative ball positioning mechanisms
2Force
If a deep groove ball bearing with full-ball is used, then bearing capacity increases, but sliding friction occurs due to increased frictional resistance between rolling balls and raceway
Solution Approach 1:
The invention changes the dimensional parameters of the rolling balls, specifically using larger diameter balls compared to conventional bearings. This parameter change allows for fewer balls to be used while achieving the same or greater bearing capacity, thereby reducing the total frictional resistance between balls and raceway and eliminating sliding friction
3Ease of manufacture
If gaps for installing balls are aligned on outer ring and inner ring, then assembly is simplified, but rolling balls may fall through the gap under axial force
Solution Approach 1:
The invention introduces asymmetric positioning features on either the inner ring or outer ring that prevent the gaps from being perfectly aligned. This asymmetric design maintains assembly simplicity while ensuring that even when gaps are near-aligned, the asymmetric feature blocks the path for balls to fall through under axial loading, thus retaining reliability
4Force
If more rolling balls are installed to increase bearing capacity, then load capacity improves, but friction between balls increases causing sliding friction
Solution Approach 1:
The invention changes the size parameter of the rolling balls to larger diameters. This allows the bearing to achieve high load capacity with a reduced number of balls, thereby decreasing the total friction between adjacent balls and eliminating sliding friction, while still meeting the required bearing capacity through the increased load-bearing capability of each individual larger ball
Data Source
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AI summary
A rolling deep groove ball bearing includes a bearing outer ring (1), a bearing inner ring (2), a plurality of large rolling balls (3) and special-shaped rollers (4), where the large rolling balls (3) and special-shaped rollers (4) are arranged between the bearing inner ring (1) and the bearing outer ring (2), and the large rolling balls (3) and the special-shaped rollers (4) are arranged at intervals. For the rolling deep groove ball bearing, the rolling balls (3) and the bearing raceway realize the pure rolling, where high linear velocity is subjected; the bearing capacity is large; the noise is low; the reliability is high and the service life is long. The deep groove ball bearing has no gap for installing balls and is simply assembled.