Types of Double Row Ball Bearings and Their Uses

July 29, 2016

It’s true that engineers can’t just duplicate a critically important component and gain twofold functionality, but double row ball bearings come close to this mathematical ideal. The friction-cancelling mechanism still employs concentrically configured races, one above the other, but two sets of ball bearings are inserted between the sliding rings.

Types of Double Row Sliding Configurations 

Angular contact areas vary in this product, with 20° and 30° contact areas providing identifying attributes between the two most popular angular contact ranges. The two sets of balls sit back-to-back, but the bearing axis forms an angle relative to the radial plane. Conversely, self-aligning double row ball bearings adopt a diverging arrangement, a configuration where the races automatically align and account for thrust force. Finally, other rolling elements have taken to the doubled-up bearing field, with rolling pins and plain bearings leading the pack.

The Uses of Bearing Parallelism

In placing two rows of bearings back-to-back or even arranging them so they alternate, one set against the next, we reinforce bi-directional loading aptitude. The first set of bearings handles radial stress. The second set, well, in this scenario it rotates with steely ruggedness as axial loading effects are balanced. Additionally, the widened races support this approach by reinforcing overall surface area coverage, thus delivering considerably greater load-carrying ability. Of course, the multiplication of ball bearings and race width cannot continue indefinitely, but users can purchase four-fold products, which represents an effective doubling of the doubled bearings.

More Rows Equals Stronger Applications

Performance conformity remains predictably consistent between the doubled sliding elements, but dual load-handling versatility really makes a difference when it comes to applications. Due to the face-to-face configuration, the two loading factors switch seamlessly when the bearing reverses, which is a compelling feature, one that slots right into place in a larger-than-life transmission box. Large-scale cranes and hoists employ such gearing products. Also, self-aligning variants are immune to angular misalignment stress, so they’re often used in textile mills and yarn spindles, parts that work accurately as they experience radial and axial shock.

Designed for heavy angular loads and lighter jobs where accurate radial motion is a must-have feature, the doubling of an already plentiful friction-minimizing asset simply works. Axial and radial loading events are capably offset by the twin ball arrays. Plus, do remember that this rolling element multiplication strategy works on other forms. Look for thrust bearings that use two sets of pins and rollers, for instance.

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