Page 118 - Rollingbearings

B.4 Lubrication
Selecting a Table 3 Table 5
suitable grease Temperature ranges for greases Load ranges for greases

Range Temperature Load range Load ratio
C/P
Selecting a suitable – °C °F
L Low ≥ 15
SKF grease L Low < 50 < 120 M Medium ≈ 8
M Medium 50 to 100 120 to 210
H High ≈ 4
H High > 100 > 210 VH Very high < 2
The assortment of SKF greases for rolling EH Extremely > 150 > 300
bearings provides adequate choice for most high
application requirements. These greases
have been developed based on the latest
knowledge of rolling bearing lubrication and
their quality is continuously monitored.
Table 4

Speed ranges for grease lubricated radial bearings
Using LubeSelect and
selection rules Speed range Speed factor Spherical roller, tapered Cylindrical roller
Ball bearings
roller, CARB toroidal bearings
SKF LubeSelect is an online tool that lists roller bearings
nd
SKF greases that fulil the demands of your m
speciied operating conditions. The analysis – mm/min
performed by the tool is based on general-
ized selection rules that have been carefully VL Very low – < 30 000 < 30 000
developed by SKF lubrication experts. L Low < 100 000 < 75 000 < 75 000
The same selection rules are used in the M Medium < 300 000 ≤ 210 000 ≤ 270 000
SKF bearing grease selection chart, H High < 500 000 > 210 000 > 270 000
page 124, where the speed, temperature VH Very high ≤ 700 000 – –
and load range are used as the primary EH Extremely high > 700 000 – –
operating parameters for selecting a suitable n = rotational speed [r/min]
grease.
d = bearing mean diameter [mm] = 0,5 (d + D)
m
Lubrication tions for SKF greases are provided in Tech-
The most important technical speciica-
nical speciications for SKF greases,

B.4 page 126.
Temperature, speed, and load
ranges for grease selection

The terms used to specify the ranges of
temperature, speed and load, for grease
lubricated bearings, are deined in table 3 to
table 5.

Consistency, NLGI
Consistency is a measure of the stiffness of
the grease. Classiication of greases by con-
sistency is in accordance with the National
Lubricating Grease Institute (NLGI), ISO 2137.
Greases with a metallic soap thickener and a
consistency grade of 1, 2 or 3 (soft to stiff) on
the NLGI scale are typically used for rolling
bearings. The most commonly used greases
have a consistency of grade 2.

116