Page 19 - The Tribology Handbook
P. 19
A2 Selection of journal bearings
10000 000
1000 000
1000 000
100 000
ul c
$ 100000
m
10 000
0
a
s
z
= 10000
z 1000
2
<
u
n
1000
100
100
10
10
n, rev/s
-------------
Rubbing plain bearings in which the surfaces rub together.
The bearing is usually non-metallic.
0
Plain bearings of porous metal impregnated with a lubricant.
Rolling beprings. The materials are hard, and rolling elements
separate the two moving components.
J?luid film plain bearings. A hydrodynamic pressure is gener-
ated by the relative movement dragging a viscous fluid into a
taper film.
Selection by load capacity of bearings with continuous rotation
This figure gives guidance on the type of bearing which lubricant is assumed to be a medium viscosity minerd oil.
has the maximum load capacity at a given speed and shaft In many cases the operating environment or various
size. It is based on a life of 10 OOO h for rubbing, rolling and special performance requirements, other than load capa-
porous metal bearings. Longer lives may be obtained at city, may be of overriding importance in the selection of
reduced loads and speeds. For the various plain bearings, an appropriate type of bearing. The tables give guidance
the width is assumed to be equal to the diameter, and the for these cases.
A2.1
