Page 334 - The Tribology Handbook

C8 Rolling bearing lubrication

Table 8.3 The effect of environmental conditions on the choice of a suitable type of grease
Sbeed maximum Tvbical service temberatur~
NLGI hercentage /A
ljpe of grease grade recommended Environment Maximum Minimum Base Oil uiscosi~ Comments
no. maximum for (approximate values)
grease) "C OF "C "F
Multi-purpose, not advised
{ :P at max. speeds or max.
Lithium 2 temperatures for bearings
up to 140 cSt at above 65 mm bore or on
100°F vertical shafts
Lithium For max. speeds recom-
mended where vibration
loads occur at high speeds
Lithium EP 1 75 Wetordry 90 195 -15 5 Recommended for roll-neck
70
Lithium EP 2 Wetordry 9o 160) - 15 } 14.5 cSt at 210°F bearingsand heavily-load-
195 ed taper-roller bearings
Calcium 1,2and3 50 Wetordry 60 140 -10 14 140cSt at 100°F
(conventional)
~~
Calcium EP 1 and 2 50 Wetordry 60 140 -5 25 14.5 cSt at 210°F
Sodium 3 75/100 Dry 80 175 -30 -22 30cSt at 100°F Sometimes contains 20%
(conventional) calcium
Clay 50 Wetordry 200 390 10 50 550 cSt at 100°F
Clay 100 Wetordry 135 275 -30 -22 Up to 140 cSt at
100°F
Clay 100 Wet or dry 120 248 -55 -67 12 cSt at 100°F Based on synthetic esters

Silicone/lithiurn 75 Wet or dry 200 390 -40 -40 150 cSt at 25°C Not advised for conditions
where sliding occurs at
high speed and load

200
10 000 .Vultipl_v bearing speed from
c 8000 S Bearing gpe Figure 8.1 bv this, factor to get
6000 5
/he maximum speed for each Qpe
$ 100
5000 f of bearing
Li
w 4000 0- - Cage centred on As Figure 8.1
L 50 3000 m
LrY 2500 % .z inner race
0 2000 4 3 Pressed cages 1.5-1.75
5
x
LL 1500 a .e centred on
6 *
w 20 -0 rolling elements
m 1000 I
E & Machined cages 1.75-2.0
0 20 40 60 80 100 120 140 2.; centred on
BEARING BORE, rnrn 'i: m rolling elements
Figure 8.1 Approximate maximum speeds for 5 5 Machined cages 1.25-2.0
grease lubrication. (Basic diagram for calculating 2 centredon
bearing speed ratings) outer race
Taper- and spherical- roller 0.5
bearings
Bearings mounted in 0.75
adjacent pairs
Bearings on vertical shafts 0.75
Bearings with rotating outer 0.5
races and fixed inner
races
C8.2