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9 EXTERNAL SELF ALIGNING BALL BEARING UNITS

SHAFT DESIGNS For bearing units with covers, it is recommended that the units
Although the shafts used for bearing units require no particularly shown in the following table be used with shafts of the corre-
high standards of accuracy, its is advisable that, as far as sponding diameters, as shown.
possible, they be free from bends or flaws.
L O A D
C O N O I T I D N S w ƒ X E A M S E L P
N m r o d n a l a t h g i l s c i r t c e l E m o c - o b r u T , s r o t o m , s r o s s e r p R s n l i k - y r a t o
Set screw bearing units k c o h s t n e u q e r f n i 2 . 1 ~ 0 . 1 . c t e
R g n i l l o , s k c o t s o P w s n a r t r e , n o i s s i m
M e t a r e d o k c o h s
Under normal conditions the inner ring is fitted onto the shaft by a i t r e n i d n a 5 . 1 ~ 2 . 1 M l a t e w g n i k r o m , e n i h c a , s e n a r C u e n P m c i t a , s s e r p
R g n i t a c o r p i c e s e n i g n e
means of a clearance fit to ensure convenience of assembly. In , s r e h s u r C , s r e k a h S , s n e e r c S l e e t S , s d n a t s l l o r l l i m
H y v a e k c o h s 0 . 3 ~ 5 . 1
this case, the values shown in the diagram below (Figure 1) are R r e b b u g n i x i m s l l o r
appropriate dimensional tolerances for the shaft.
The value of the radii of the rounded corners are those shown
in table 8.2.
On the calculation of the dn value, apply the bore
dimension of the metric series in the same group.
250 000 Eccentric collar bearing system
Example:
UCP205-100D1
Like set screw systems, it is usual to fit the inner ring onto the
Bore dimension 25mm X n (r/min)
m6 shaft by means of a clearance fit, for ease of assembly.
The diagram below (Figure 2) shows the appropriate value of
170 000
d (mm) x n (r/min) 130 000 k6 dimensional tolerances for the shaft.
dn Value j7 On the calculation of the dn value, apply the bore
100 000
h7 dimension of the metric series in the same group.
70 000
Example:
h8
40 000 250 000 UELP205-100D1
h9 Bore dimension 25mm X n (r/min)
20 15 10 7 5 3 1
m6

Fig 1: Shaft dimensional tolerance for 170 000
dn Value d (mm) x n (r/min) k6
set screw bearing units 130 000 j7

where : 100 000 h7
70 000
C: Basic load rating
P: Calculated bearing load P = f wF h8
40 000
F: Bearing load, kg. h9
fw : impact factor shown in the table.
d: bearing bore diameter (mm) 20 15 10 7 5 3 1
n: running speed, rpm
NOTE: Shaft tolerances are shown by ISO Fig 2: Shaft dimensional tolerances for eccentric collar
Details shown in the table on page ..... bearing units

Adapter system bearing units
Step shafts
In the case of adapter systems, the bearing unit is fastened on
Wherever there is a noticeably large axial load, a step shaft (as
the shaft be means of a sleeve. With regard to dimensional
shown below) should, if practical be used.
tolerances for the shaft, h9 is applicable under all operation
conditions.

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