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9 INTERNAL SELF-ALIGNING BALL & ROLLER BEARING UNITS

Table 13 Housing Fits for Spherical Roller Bearings. (ISO Housing tolerances table 23 page 186)
H O U N I S G
T Y P E O F L O A D S A N D M O U N N I T G C O N O I T I D N S T Y C I P A L A P P C I L A O I T N S
T I F S
H y v a e s d a o L P 7 ) 1 e n a r C S t r o p p u W , s l e e h n i s n i p - k n a r C a r F m e S a w s
R g n i t a t o O r e t u O r e t u g n i R N 7 ) 1 y e l l o r T W , s l e e h , s n i p - k n a r C S , s e v a e h
g n i R d a o L r o t a r b i V S s n e e r c
N m r o d n a l a t h g i L s d a o L y l l a i x a
e l b a e c a l p s i d M 7 C r o y e v n o R , s l l o e n a r C R n u w s l e e h
H y v a e S k c o h s d a o L M 6 y l F w n i s l e e h s e s s e r P
O r e t u g n i R t o n
n o i t c e r i D f o K 7 M - t f a h s k n a r C n i a B s g n i r a e
g n i d a o L e t a n i m r e t e d n I H y v a e s d a o L y l l a i x a
e l b a e c a l p s i d K 6 n o i t c a r T M s r o t o
N m r o d n a l a H y v a e s d a o L O r e t u g n i R t o n P u m , s p o l B w s r e
y l l a i x a 7 J
N m r o , l a H y v a e d n a S k c o h s d a o L e l b a e c a l p s i d R d a o r l i a A e l x B s e x o
y r a n o i t a t S O r e t u N m r o d n a l a H y v a e s d a o L O r e t u g n i R s i H 7 G l a r e n e B g n i r a e A , s n o i t a c i l p p A e l x B s e x o
g n i R d a o L N m r o d n a l a t h g i L s d a o L y l i d a e r H 8 e n i L S t f a h S t i l p H s g n i s u o
e l b a e c a l p s i d
H t a e S d e i l p p u h g u o r h t S t f a h G 7 r e y r D C , r e d n i l y R l l o N , s k c e R r e l l o T s e l b a
1) Bearings with larger radial clearance than normal are required.

5. Handling of bearings

Roller bearings are generally higher in precision than • Lubricate contact surfaces with a light machine oil prior
ordinary machine parts and in handling, particular care is to pressing. This will reduce the required force and
to be exercised to prevent dust intrusion, rust formation, prevent seizing.
dents or damage from impact, etc. • When a bearing is pressed onto a shaft, the force is to
It is also important to use the correct installation method be applied to the inner ring. When a bearing is to be
in order to ensure a properly mounted bearing. Below are pressed into a housing, the force is to be applied to the
some general rules to be observed for correct mounting outer ring.
and dismounting of bearings. (b) Tapered bore bearings
Tapered bore bearings have the advantage in the
7.1 Mounting small-to-medium size range of being easily dismounted
from the shaft, and in larger sizes the elimination of
Pre-assembly preparations
problems encountered in tight-fit mounting of cylindrical
• Work areas should be as clean as possible.
bore bearings. The tapered bore allows direct fitting on a
• All necessary tools, jigs, hydraulic pumps, etc.,
tapered shaft, but it is more commonly used in conjunc-
are to be kept ready for the assembly work.
tion with an adapter or withdrawal sleeve.
• The shaft diameter and housing bore, etc.,
When mounting a bearing of this type on a tapered shaft
should be checked.
it is necessary to check the amount of decrease in radial
• Burrs, etc., are to be removed.
clearance relative to the displacement of the bearing
• Housing oil holes are to be checked for dust,
along the shaft as it is pressed into place, with figures
and swarf, etc.
shown in Table 14.
• Bearings should be kept wrapped until immediately
Prior to mounting, the exact radial clearance of the
before the assembly work.
bearing should be checked with feeler gauges and
Mounting on shaft:
noted. The recommended decrease in clearance should
(a) Cylindrical bore bearings.
be determined from Table 14 and the bearing should
In most cases bearings are mounted with an interference
then be pressed on to the tapered shaft to the point
fit on the shaft. Larger bearings are more easily mounted
where the required
by the heat expansion method, while smaller bearings
internal clearance is achieved. The bearing should then
can be pressed on.
be positively located in this position by means of a
Pressing Method
lock nut etc.
• Either a hydraulic press or an arbor press may be used
Matching of the taper of the bearing bore with that of the
to mount bearings. No attempt should be made to
shaft should be checked by the use of “prussian blue”.
hammer bearings into place.
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