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:
- radial load
- radial accuracy
- specification of the diametrical clearance between the journal and the bearing
- temperature range of operation
- required lifetime of bearing
- cooling requirements
The angle between the steady state preload through the bearing centreline, and a line drawn between the bearing centre and the shaft centreline.
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
A flaking of the surface of a bearing.
Subjects: Mechanical Engineering