Item |
Grease Lubrication |
Oil Lubrication |
|
|
|
Housing and sealing system configuration |
Simplified |
It becomes a little complex and requires maintenance cautions |
Speed |
The acceptable limit is 65 ~ 80% of the oil lubrication |
Also applicable at high speeds |
Cooling work
Cooling effect
|
none |
It enables removing heat efficiently (as for the oil circulation method) |
Fluidity |
Poor |
Very good |
Lubrication Replacement |
A bit complex |
Relatively easy |
Impurity filtering |
Difficult |
Easy |
Dirt by leakage |
Reduced |
Improper for locations where dirt is inconvenient |
Grease Lubrication
Quantity of Grease Inserted into the Shell
The quantity of grease to be inserted into the shell varies according to conditions, such as, bearing speed, shell configuration, empty space, grease type and enviroment. In the bearing applications, such as, spindles in machine tools, in which the temperature increase is not desired at all, the grease is inserted in lower quantities. The reference quantity for normal cases must follow the diagram below.
Initially, the bearing must be filled with grease (in enough quantity), by forcing its entry in points, such as the cage guide surface. Next, in terms of the empty space within the shell, with the bearing and shaft already positioned, 1/2~2/3 of the space must be filled for speeds (rpm) below 50% of the limit, and 1/3~1/2 of the space for speeds over 50% of the limit in the dimensional tables.
 
|
Products 
