Bearing,  Design,  P

Pad Preload (Tilting Pad Bearings)

A titling pad bearing parameter that quantifies how the radii of the pads differ from the journal radius. Preload is defined by the following formula:

where Mp is the bearing preload; Cb is the radial bearing clearance; and Cp is the radial pad clearance.

A preload of zero means there is a constant clearance around all pads, while a positive pad preload helps develop a converging oil film. Increasing the pad preload is a common means of eliminating pad flutter, even under light and nonload conditions. Negative preloads are generally avoided to prevent divergent oil films and pad flutter.

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