Page 23 - The Tribology Handbook

A3 Selection of thrust bearinas

Thrust bearing selection for special environmental conditions
rYPC of High Low Wet and Dirt and External
beanng tmpefature temperature Vacuum humid dust vibration
Rubbing Good-to Good Excellent Good with Good- Good
bearing temperature suitable sealing
(non- limit of shaft and helps
metallic) material runner
material
Oil- Poor- Fair- Possible Good Sealing Good
impregnated lubricant starting with necessary
porous oxidation torque may special
metal be high lubricant
bearing
Rolling Above 100°C Good Requires Fair with Sealing Consult makers
bearing reduced special seals necessary
load lubricant
capacity
Above 150°C
consult
makers
~~
Hydrodynamic Good-to Good- Possible Good Sealing Good
film temperature starting with necessary
bearing limit of torque may special
lubricant be high lubricant
Hydrostatic Good-to Good Not Good Gwd- Good
film temperature normally filtration
bearing limit of applicable necessary
lubricant
General Consider thermal expansion Consider Consider
comments and fits corrosion fretting

Thrust bearing selection for special performance requirements

Suitability
for
Or
rYp of Accuracy Low Low Silent oscillatOry Availability Simplict~ of
bcanng of axial starting running running intmittmt of standard lubrication
location torque torque movement parts gstm
Rubbing Limited Poor Poor Fair Yes Some Excellent
bearing by wear
(non-
metallic)

Oil-impreg- Good Fair Good Good- Yes Good Excellent
nated until
porous bearing
metal dv-out
bearing
Rolling Good Good Good Usually Yes Excellent Gd-
bearing satis- when
factory grease
lubricated

Hydro- Good Fair Good Good No Some usually
dynamic requires
film circulation
bearing system
Hydro- Excellent Excellent Good Good YeS No Special
static system
film necessary
bearing

A3.2