Page 91 - The Tribology Handbook
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A15 Plain thrust bearings
Estimation of approximate performance
Recommended maximum load:
Symbol and meaning SI units Impm'al units
W = Kl(D2-d2)
W load N Ibf
Approximate power loss in bearing: H power loss W h.p.
H= K2n4 W Q flow rate m3/s g.p.m.
Lubricant flow rate to limit lubricant (oil) temperature n rotational speed rev/s r.p.s.
rise to 20°C:
4 D mrn in
Q=K3H
d, (D + 412 rnm in
K, 0.3 48
KZ 7ox 11 x 10-6
K3 0.03 x IO-' 0.3
Lubricant feeding
il---91
-5+
Lubricant should be fed to, or given access to, inner
diameter of the bearing so that flow is outward along the
grooves.
BREAK SHARP EDGES For horizontal-shaft bearings the grooves may have to
be shallow (0.1 mm) to prevent excess drainage through
the lower grooves, which would result in starvation of the
cIlI3-A upper pads. For bearings operating within a flooded
housing a groove depth of 1 mm is suitable.
Suitable groove profiles
AI 5.2
