|
.
How it Works :
/
In
the stationary position, shaft & bush are in contact with each other. When the
shaft starts to rotate, it causes friction which increases temperature. This
increase in temperature produces 'elastic deformation' & forces the bush to
expand.As it does so, the lubricating oil within the bush weeps out & creates a
'hydrodynamic oil' film between the bush & the shaft.
.
Once
the shaft has stopped rotating, the oil is sucked back into the 'pores' of the
bush due to capillary action. This phenomenon is called self lubrication because
it practically eliminates the need of any external source for lubrication.
.
|
In the stationary position, the
shaft and bush are in contact with each other.
|
|
During operation, a 'hydrodynamic
oil' film separates the shaft & bearing.
|
|
Lubricant distribution in a
sintered plain bearing
|
Properties:
/
These bushes are available in Iron/Copper mixes, diluted Bronze, Graphite Bronze
& 100% Bronze. The oil content by volume can vary from 15% to 25% depending on
the density of the bush. As the density increases, so does the strength -
however, this reduces the oil content & hence it's lubricating properties. Other
properties depend on the metal powder being used.
.
|