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COMPONENTS OF FRICTION BEARINGS
Normally have two components that operate under sliding friction
The two surfaces that slide over one another cause higher levels of friction than what occurs in anti-friction bearings
Friction bearings, also called plain bearings, normally have two components that operate under sliding friction conditions.
An example is a **bush with a pin or shaft within it**.
Under normal conditions the two surfaces slide over one another while in operation, and this causes higher friction levels than what occurs in anti-friction bearings.


The following are a few of the most common types of bearings used on a mine: pin and bush, which are commonly found in excavators and shovels; spherical bushes, which are commonly found in dump truck suspension systems;ball bearings, which are commonly found in electric motors and smaller pumps; taper roller bearings, which are commonly found in wheel bearings and larger pumps; and spherical roller bearings, which are commonly found in belt conveyors and fans.
Plain bearing pin and bushes rotate slowly and under high load
Plain bearing pin and bushes rotate slowly and under high load, and quite often they only oscillate through a few degrees, not making full rotations.
Specific types of bearings include pin and bush, spherical bush, ball bearings, taper roller bearings and spherical roller bearings.
In the case of pin and bush lubrication, the grease is continuously stressed from the bearing operation, shock load and vibration.Grease with poor mechanical stability will lose its consistency and leak out of the bearing and the machine will have to be stopped more often to allow grease replenishment.
A grease’s loadcarrying capacity is very important, particularly in the mining industry where loads in applications, such as pin and bushes, are extremely high.
In some versions there is the addition of molybdenum disulphide for superior performance in pin and bush applications.
When talking about pin and bush lubrication needs, customers refer to pin and bush
Spherical bush lubrication needs are very similar to pin and bush needs
The lubrication requirements for spherical bush bearings are very similar to that of pin and bush bearings.
On most machines, only one grease is used as the pin and bush and spherical bush lubricant.
The following Shell Gadus greases are recommended for pin and bush and spherical bush lubrication.
It has a 460 centistokes base oil viscosity which improves film thickness andin combination with the three percent molybdenum disulphide solid lubricant, provides excellent protection against shock loading for pin and bush applications operating under the harshest conditions.
Full synthetic grease designed for multipurpose lubrication of rolling element and plain bearings, as well as pin and bush applications
It is a fully synthetic grease designed for multipurpose lubrication of rolling elements and plain bearings, as well as pin and bush applications found throughout the mining industry in applications such as shovels, draglines and dump trucks.
This mine operates Hitachi EX3500 and EX5500 excavators with an average bucket pin and bush life of 3,500 to 5,500 hours