Page 682 - SKF-bearing-housings

Metric roller bearing units SYNT and FYNT series (SKF ConCentra)

The basic dynamic load rating C is provided in • For a vertical shaft, the interval should be
the product tables. The equivalent dynamic halved.
bearing load P can be obtained from • For outer ring rotation or rotating load, the
interval should be halved.
when F a /F r ≤ e • For contaminated environments, the follow-
P = F r + Y 1 F a
P = 0,67F r + Y 2 F when F a /F r > e ing reduction factors should be used:
– 0,5 for moderate contamination
where – 0,3 for severe contamination
P = equivalent dynamic bearing load [kN] – 0,1 for very severe contamination
F r = radial component of the bearing load
[kN] Relubrication procedure
F a = axial component of the bearing load [kN] Before relubricating, the grease fitting and the
Y 1 ,Y 2 = axial load calculation factors for the area surrounding it should be cleaned. High-
bearing († table 9) pressure cleaning equipment should be
e = limiting value for F a /F r († table 9) avoided. During relubrication, grease should
be introduced via the grease fitting († fig. 9)
The calculated relubrication intervals repre- while the shaft is rotating slowly. Excessive
sent the grease life L 1 , which relates to the pressure and over-greasing should be avoided,
time period at the end of which 99% of the otherwise the seals may be damaged.
bearing units are still reliably lubricated. The
intervals are estimated values, applicable for
bearing units mounted on horizontal shafts in
a relatively clean environment. When operat-
ing conditions differ, the relubrication inter-
vals should be adjusted as follows:

Table 9
Bearing mean diameter and calculation factors for SKF ConCentra roller bearing units
Bearing unit Bearing mean Calculation factors
diameter
Size d m e Y 1 Y 2
– mm –

SYNT 35 FYNT 35 53,5 0,31 2,2 3,3
SYNT 40 FYNT 40 60 0,28 2,4 3,6
SYNT 45 FYNT 45 65 0,26 2,6 3,9
SYNT 50 FYNT 50 70 0,24 2,8 4,2
SYNT 55 FYNT 55 77,5 0,24 2,8 4,2
SYNT 60 FYNT 60 85 0,24 2,8 4,2
SYNT 65 FYNT 65 92,5 0,24 2,8 4,2
SYNT 70 FYNT 70 97,5 0,22 3,0 4,6
SYNT 75 FYNT 75 102,5 0,22 3,0 4,6
SYNT 80 FYNT 80 110 0,22 3,0 4,6
SYNT 90 FYNT 90 125 0,24 2,8 4,2
SYNT 100 FYNT 100 140 0,24 2,8 4,2

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