Tilt pad journal bearings provide an inherently stable design for rotating machinery. Pads are retained in a shell (or housing) and held in place by end plates. Bearings Plus provides several pad pivot types and pad geometries to increase load capacity, accommodate misalignment and optimize dynamic performance of the machine.
Two of the most common tilt pad designs are rocker back pads and ball and socket pads. Rocker back tilt pads use a line contact to allow the pad to tilt, while ball and socket pads have a spherical surface contact. Flexure Pivot tilt pad journal bearings, in which the pad and pivot are integral to the bearing shell, are also available as a high-stability option.
Rocker pivots typically cover the full axial length of a bearing pad, providing greater stiffness than the ball and socket pivot. The pads, however, do not allow any axial tilting motion, and can lead to high pivot stresses if there is any misalignment.
The full surface contact of the spherical ball and socket pivot reduces stress on the pivot compared to the rocker back design, and also allows tilting in all directions.
Bearings Plus can further optimize tilt pad journal bearings via the number of pads, lubrication type and material selection.