Back-to-back arrangementIn a back-to-back bearing arrangement (fig. 1), the load lines diverge along the bearing axis. Axial loads acting in both directions can be accommodated, but only by one bearing or bearing set in each direction.
Bearings mounted back-to-back provide a relatively rigid bearing arrangement. The wide span between bearing effective centres makes this arrangement particularly well suited to support moment loads.
Face-to-face arrangementIn a face-to-face bearing arrangement (fig. 2), the load lines converge along the bearing axis. Axial loads acting in both directions can be accommodated, but only by one bearing or bearing set in each direction.
The short span between effective bearing centres makes face-to-face arrangements less suitable to support moment loads.
Tandem arrangementThe use of a tandem arrangement provides increased axial and radial load carrying capacity compared to a single bearing. In a tandem arrangement (fig. 3), the load lines are parallel so that radial and axial loads are shared.
The bearing set can only accommodate axial loads acting in one direction. If axial loads act in both directions, or if combined loads are present, additional bearing(s) adjusted against the tandem arrangement must be added.