Double Row Angular Contact Ball Bearings: Uses and Applications

August 14, 2018

Instead of two individual bearings mounted on an overly stressed machine shaft, the architecture of this mounting element has adopted a more consolidated profile. There are the familiar but widened races, which accommodate two rows of rolling balls. The cage is similarly condensed. It’s now reconfigured so that it can restrain two rows of ball bearings. And what of the angular contact feature?

Configuring Angular Contact Architectures

In this ball bearing configuration, one ball flanks its mate. The pairs of rolling elements are arranged in a ring around two widened races. Furthermore, there’s a pair of wide grooves on the surfaces of the races, the faces that interact with the friction-cancelling ball bearings. Moving away from the conventional spot contact points used in single-row technology, the balls form contact lines. A spot contact moves in a line from one ball to its matching operator. It’s those point-to-point load lines that grant the bearing its bi-directional loading attribute.

Double Row Angular Contact Applications

The bearings are plainly built to handle heavier loads. If a radial or axial weight exerts force, then the stress will be distributed throughout the broadened rings. Above and beyond this clear-cut benefit, double row angular contact ball bearings also have multi-directional capabilities. If radial forces move at one angle while an axial force is exerted at a load-contradictory angle, then the load lines created between the paired balls will accommodate those conflicting forces. Just as a single logical application, picture a conveyor belt system. Faced with shock loads, up and down motion, and rolling forces, the equipment processes these contrary forces by calling upon the bi-directional load handling capabilities of those single-ringed, ball-paired bearings and their broadened angular contact features.

Conflicting Load Applications

If conveyor systems benefit from a low-noise, high-load bearing configuration, then heavy-duty packaging systems are likely to share that benefit. The sway and lifting momentum attached to elevators (lifts) come next. The ascending/descending cubicle, supported by numerous cables, places stress on its lifting engine. This powerful motor can handle the lifting stress or the sway of the cables, but it can’t endure both loading factors, not unless its drive bearings are designed to process multiple loading vectors. Smoothing the sway and performing the lift, the drive motor and its shaft stay true to their axial plane when they’re fitted with double row angular contact ball bearings.

In any machine setup where two-directional forces are unavoidable, these broadened and row-multiplied bearings are fitted. They eschew point-contact zones in favour of a point-to-point load line configuration, a design that stretches load-handling functionality between the pairs of balls.

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