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128 KRW
Lubrication
Hints related to bearing design
Operating bearing temperatures with selected applications
Bearing without external heating Operating temperature [°C]
Wood working machines 40 ... 50
Table drilling machines 40
Horizontal drilling machine 40
Machine tools 50 ... 55
Calender rollers on paper machines 55
Roller support bearing on hot rolling mills 55
Jaw crusher 60
Wheel set bearings of locos and trains 60
Roller bearing in wire drawing system 65
Vibration motors and rollers 70 ... 90
Oscillating grate spreader 80
Ship‘s propeller 80
Bearing with technologically
caused external heating Operating temperature [°C]
Electric drive motor 80 ... 90
Drying chamber on paper machines 120 ...130
Hot gas ventilators 120
Water pumps on car 120
Engine crankshaft 120
Calender rollers for plastic moulds 180
Wheel bearing of burning oven 200 ... 300
Ball bearings lubrication
The lubrication of deep groove ball bearings, angular ball bearing as well as 4 point and floating ball bearings has
no special requirements on the addition of lubricants, since areas of sliding friction at the point of contact between
rolling elements and raceways can almost be ruled out.
In particular cases, e.g. with fast moving ball bearings, the minimum load must be noted in order to ensure troublefree
rolling of the balls. The correct value for the minimum load is given as P min = 0.01 · C.
Lubrication of cylindrical roller bearings
Cylindrical roller bearings are finished in a rich selection of bearing designs. This is due to the fact that cylindrical
roller bearings can be used both as fixed bearings and floating bearings. From the point of view of lubrication, the
designs can be differentiated as being with or without cage.
When using cylindrical roller bearings as floating bearings (series N, NU), slide movements occur on the sideboards
which come under defined load when used as fixed bearings (series NJ, NUP but also with angle rings). The so-called
open sideboards ensure constant access and hydrodynamic load of the lubricant to be used.
The admissible axial load of a cylindrical roller bearing may be calculated as quoted in the KRW delivery programme.
However, not only the possible hydrodynamic load must be calculated, the board height of the cylindrical roller bearing
must be taken into consideration and sufficiently supported.
Cylindrical roller bearings also require a minimum load for efficient rolling of the rolling elements; this can be closely
estimated with P min = 0.02 · C for all the roller bearings.
Particularly for large roller bearings from the Kugel- und Rollenlagerwerk Leipzig GmbH range, sufficient additives
for the lubricant used must be taken into consideration with a suitable viscosity ratio κ=υ/ υ/ υ/υ / υ1
which the Additives
table gives a full overview of.