Double-Row Angular Ball Bearing Outer Ring Rigidity
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Solution Overview
Problem
Conventional double-row angular contact ball bearings experience deformation and reduced circularity of the outer ring during swaging, leading to compromised attachment performance and potential noise generation due to low rigidity and small radial distance between the shield groove and outer ring surface.
Innovation Solution
A double-row angular contact ball bearing design featuring a sealing device with a thickness ratio of Ts/Tr ≤ 0.07, where Ts is the sealing device thickness and Tr is the outer ring thickness at the groove bottom, and a ball diameter between 75% and 83% of the bearing width, with a radially folded U-shaped cross-section for reduced deformation and improved rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shield is swaged onto the outer ring to improve sealing performance, then sealing performance is improved, but the outer ring deforms and circularity is degraded
Solution Approach 1:
The invention changes the geometric parameters of the outer ring by increasing its thickness at the bottom portion of the shield groove. This parameter modification increases the rigidity of the outer ring, allowing it to withstand the swaging force without deforming, thereby maintaining circularity while still enabling effective sealing attachment
2Volume of moving object
If the radial distance from the bottom portion of the shield groove to the outer diameter surface is small to reduce bearing size, then compactness is improved, but the rigidity of the outer ring is reduced and circularity is easily degraded
Solution Approach 1:
The invention applies local quality by creating a localized thickening of the outer ring specifically at the bottom portion of the shield groove. This local structural modification provides enhanced rigidity and strength exactly where the swaging force is applied, while the rest of the bearing maintains its compact dimensions
3Force
If a large diameter ball is used to increase high-load capacity, then load capacity is improved, but the bearing width increases
Solution Approach 1:
The invention transitions from a single-row configuration to a double-row configuration, utilizing the axial dimension more efficiently. This allows the use of larger diameter balls to increase load capacity while controlling the overall bearing width by arranging two rows of rolling elements in parallel
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 enhances the circularity and rigidity of the outer ring, ensuring superior attachment performance and reduced noise during rotation, while maintaining high-load capacity and effective sealing to prevent foreign matter and lubricant leakage.
Implementation Method 1
a sealing device is provided in a bearing used for a pump to prevent the entrance of foreign objects or dusts from the outside to the inside thereof or leakage of lubricant from the inside to the outside
Implementation Method 2
In attaching the shield onto the rolling bearing, for example, a radial outer end portion of the shield is fit into a shield groove arranged on an inner circumferential surface of an outer ring, and is then swaged and secured thereto
Implementation Method 3
a plurality of rolling elements rollably arranged between a raceway surface of the inner ring and a raceway surface of the outer ring
Data Source
AI summary
A double-row angular contact ball bearing is provided with inner and outer rings, balls in two rows, a cage for holding the balls, and non-contact sealing devices made of a substantially disc-like member. Radial outer end portions of a metallic sealing device are respectively fit and swaged into grooves arranged at both axial end portions of the outer ring's inner circumferential surface. The ratio Ts/Tr is equal to or lower than 0.07, where Ts is the sealing device thickness and Tr is the outer ring thickness at the bottom portion of the groove. In addition, the ball diameter is equal to or greater than 75% of a half a bearing width to equal to or greater than 83% thereof. Furthermore, an axial width Tc of the radial outer end portion having a substantially U-shape is equal to or smaller than 2.7 mm.