Page 195 - Improving Machinery Reliability

166 Improving Machinery Reliubilify

Figure 3-55. Oil droplets flung against the top of a bearing housing have a chance of
falling back on the shaft and migrating toward the bearing internals.

T

3
E
2
-
L
a

Shaft Speed -----t
Figure 3-56. Oil delivery vs. shaft speed for different oil rings.

oil temperatures purposely induced to range from 65°F to 220°F at speeds from 880
rpm to 3,550 rpm.
This company also experimented with redesigned power ends for their line of
pumps and found that a three-fold increase in oil sump capacity resulted in signifi-
cantly reduced oil temperatures. The value of the attendant increase in bearing life