| [Pear skin] |
 |
Pear skin is a phenomenon in which
minute brinell marks cover the entire rolling surface, caused by
the insertion of contaminants. This is characterized by loss of
luster and a rolling surface that is rough in appearance.
In extreme cases, this is accompanied by discoloration
due to heat generation.
|
| [Discoloration] |
|
Discoloration is a
phenomenon in which the surface color changes because of staining
or heat generation during rotation.
Color change caused by rust and corrosion is generally separate from
this phenomenon. |
|
Indentation
similar to pear skin on the raceway and rolling contact surface. |
|
Entry of minute foreign
matter |
|
|
Clean the bearing
and its peripheral parts. |
|
Improve sealing device. |
|
| Discoloration
of the raceway, surface rolling contact surface, rib face, and cage riding
land. |
|
Too small bearing
internal clearance |
|
Improper or insufficient
lubricant |
|
Quality deterioration
of lubricant due to aging, etc. |
|
|
Provide proper internal
clearance. |
|
Select proper lubricating
method or lubricant. |
|
