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Product information
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Recommendations
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Product data Page ................4 Radial location Page ..............57 3. Temperature conditions 4. Design of associated components The design of the components provid-
ing the bearing seatings should not
lead to irregular deformation (out-of-
round) of the bearing ( âž” fig ).• Split housings are not suitable forinterference fits.• Thin-walled housings, light alloy hous-ings and hollow shafts all call for a
tighter fit to be used than for thick-
walled steel or cast iron housings and
solid shafts – and must have suffi-
cient strength.• Heavy loads and interference fits callfor thick-walled one-piece steel or
cast iron housings and solid steel
shafts. 5. Axial displacement of non-
locating bearings A non-locating bearing, which is to pro-
vide radial support only, must always
be able to be displaced axially ( âž” fig In operation, the bearing rings will nor-
mally have a higher temperature than
their seatings. This means that• the fit of the inner ring will loosen ( ). This is normally achieved by se-lecting a loose fit for one of the bearing
rings, generally the inner ring of spher-
ical
plain bearings. The reasons are• the shaft seating can be easily andeconomically hardened and ground;
this facilitates axial displacement.
The hardness should be at least 50 HRC and the surface roughness
R âž” fig ) and • the fit of the outer ring will becometighter, which may restrict any re-
quired axial displacement in the
housing.If there is a considerable temperaturedifference between inner and outer
rings there will be a change in the oper-
ating clearance which must be con-
sidered when selecting the fits, so that a blockage of the bearing can be
avoided.
4 5 3 2
z should be ≤10 µm.• the outer rings of most sphericalplain bearings are axially fractured at
one or two positions, or are radially
split. This can hinder axial displace-
ment or make it completely impos-
sible.• the housing
bore should be protec-ted against wear. Surface finish of seatings The recommended surface roughness
to ISO 4288:1996 for the bearing seat-
ings is• for shaft seatingsR
z ≤10 µm• for housing bore seatingsR
z ≤16 µm
Change of fit with temperatureOut-of-round bearing seatingAxial displacement Fig 3 Fig 4 Fig 5 S K F G E 3 - 2 R S L H 37