Page 780 - Rollingbearings

9 Spherical roller bearings
Bearings for
vibratory applications

• are available in the 223 series
• are available with a cylindrical or tapered
bore
• have C4 radial internal clearance as
standard
• are equipped with an annular groove and
three lubrication holes in the outer ring Diagram 2
• are available with a PTFE coated cylin- Grease life for sealed spherical roller bearings with designation sufix VT143 where
drical bore (designation sufix VA406), P ≤ 0,125 C
which prevents fretting corrosion between
the shaft and the bearing bore, for shaft Grease life L 10 [h]
thermal elongation in non-locating bear- 30 000
ing positions that have a rotating outer 25 000
25 000
ring load
Therefore, shafts do not require special 20 000
heat treatments or coatings
15 000
• are manufactured to one of the following 15 000
designs (ig. 10): nd m = 20 000
– E/VA405 bearings have two surface- 10 000 40 000
hardened stamped window-type steel 60 000
cages, an inner ring without langes and 8 000 80 000
a guide ring centred on the inner ring or 125 000
100 000
on the cages 6 000 150 000
– EJA/VA405 and CCJA/W33VA405 bear- 175 000
ings have two surface-hardened 200 000
stamped window-type steel cages, an 4 000
inner ring without langes and a guide
ring centred on the outer ring raceway 3 000

2 000

9
1 000
35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115
Operating temperature [°C]
n = rotational speed [r/min]
d = bearing mean diameter [mm]
m
= 0,5 (d + D)

Table 2
Speed limits for grease life calculation for sealed spherical roller bearings
Bearing series Maximum nd m value
Light load Normal load
(P ≤ 0,067 C) (P ≤ 0,125 C)

– mm/min

222, 239 250 000 200 000
223, 230, 231, 232, 240 250 000 150 000
241 150 000 80 000

778