Page 102 - Mechanical Engineer's Data Handbook

APPLIED MeCHANICS 91

Journal bearing:
2rc3 N2 Lp
D
P=
t
Thrust bearing:

- r,

Journal bearing
Thrust bearing
2.9.2 Load capacity for plain bearings

Machine and bearing Load capacity, p (MPa) Lengthldiameter, LID

Automobile and aircraft engine main bearings 4-12 0.5-1.75
Automobile and aircraft engine crankpin bearings 4-23 0.5-1.50
Marine steam turbine main bearings 1 s-4 1.0-1.5
Marine steam turbine crankpin bearings 24 1.0-1.5
Land steam turbine main bearings 0.5-4 1 .0-2.0
Generators and motors 0.3-1 .O 1.0-2.5
Machine tools 0.4-2.0 1 M.0
Hoisting machinery 0.54.7 1.5-2.0
Centrifugal pumps 0.54.7 1 &2.0
Railway axle bearings 2-2.5 1.5-2.0

W
Load capacity p= Bearing load --
Projected area-LD
This assumes a uniform pressure; actually the maxi-
mum pressure is considerably higher.