Plain Bearing

A relatively simple and inexpensive bearing typically made of two parts. A rotary plain bearing can be just a shaft running through a hole.

Critical aspects of design:

Attitude Angle

The angle between the steady state preload through the bearing centreline, and a line drawn between the bearing centre and the shaft centreline.

Friction Torque

Torque (TF) caused by the frictional force that occurs when two objects in contact move.

TF = 0.5 µ P d

where: TF = Friction torque [Nm], P = dynamic load [N], µ = coefficient of friction, d = shaft diameter [m]

For a steel shaft and a bronze bearing, µ = 0.1 to 0.25

Spalling

A flaking of the surface of a bearing.


See also: Babbitt, Bearing, Electric Motor Bearings, Friction Torque, Radial Position, Sleeve Bearing.

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Subjects: Mechanical Engineering