Description of the planetary gearbox
2.2 Technical features and environmental conditions
Planetary gearboxes for servomotors
Operating Instructions, 09/2020, A5E50494253B AA
23
Sound pressure level for NRK gearboxes
Size
050
070
090
120
155
Sound pressure level in dB(A)
58
58
60
65
70
General condition
Sound pressure level measured at a distance of 1 m away at a
drive speed of n
1
= 3000 rev/min without load; i = 5
Sound pressure level for NLC gearboxes
Size
060
080
120
Sound pressure level in dB(A)
58
60
65
General condition
Sound pressure level measured at a distance of 1 m away at a
drive speed of n
1
= 3000 rev/min without load; i = 5
2.2.5
Bearing versions
The planetary gearboxes have the following bearing versions:
Gearbox type
NRB
NRK
NLC
SP+
NP
Output bearing
type
Deep-groove ball bearing
Tapered roller bearing to accept high
axial and radial forces
Deep-groove ball
bearing
Bearing seal
Sealed bearing
Shaft sealing ring
Sealed bearing
Bearing lubrica-
tion type
Lubricated for life in the factory
