Page 919 - Rollingbearings

Loads

Loads

Minimum load The minimum load requirements can be ignored for bearings operat- Symbols
ing at the relatively low speeds shown within the green area in
diagram 1, page 919 A minimum load factor
For operating speeds outside the green area use: (product table, page 922)
C r load factor
q n w 2 = 1,8 for 292 series
F = C F + A ——– + F lub = 2,0 for 293 series
am
< 1 000 z
r
r
= 2,2 for 294 series
2 × 10 –9 f (ν n) 2/3 [0,5 (d + D)] 3 D bearing outside diameter [mm]
0
ν n ≥ 2 000 † F lub = ——————————————
d d bearing bore diameter [mm]
f 0 factor for lubrication method
3,2 × 10 –7 f [0,5 (d + D)] 3 For oil bath lubrication with a
0
For additional ν n < 2 000 † F lub = ———————————–
d horizontal shaft and for grease
information
lubrication:
† page 106
= 3 for 292 series
= 3,5 for 293 series
Equivalent F ≤ 0,55 F and:
a
r
dynamic bearing • if run-out in the bearing arrangement does not affect the load dis- = 4 for 294 series
load tribution in the spherical roller thrust bearing For oil bath lubrication with a verti­
† P = 0,88 (F + X F ) cal shaft and for oil jet lubrication:
a
r
• if run­out in the bearing arrangement affects the load distribution = 6 for 292 series
= 7 for 293 series
in the spherical roller thrust bearing (e g the run­out of another
= 8 for 294 series
bearing that induces radial forces)
† P = F + X F r F am minimum axial load [kN]
a
For additional F lub axial load required to overcome
information F > 0,55 F a † Use an additional bearing, which accommodates lubricant drag [kN]
r
† page 91 the radial load F r radial load [kN]
n rotational speed [r/min]
P equivalent dynamic bearing load
Equivalent static F ≤ 0,55 F a † P = F + X F
a
0
r
0 r
bearing load F > 0,55 F a † Use an additional bearing, which accommodates [kN]
r
the radial load P 0 equivalent static bearing load [kN]
For additional X calculation factor
information = 1,1 for 292 series
† page 105 = 1,2 for 293 series
= 1,3 for 294 series
X 0 calculation factor
= 2,5 for 292 series
= 2,7 for 293 series
= 2,9 for 294 series
ν actual operating viscosity of the
lubricant [mm 2 /s]

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