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Gearboxes Series RD
SERVICE FACTOR of the gearbox
The performance quoted in MRD geared motor tables (pages 24 to 39) is set out by taking the following service factor
range
0.8 FS 3.5
Service factor FS1.0 is meant as typical of 8 hours/day operation, uniform load, mass acceleration factor k
(a)
0.2,
starts/stops less than 300 per hour and ambient temperature between 15 and 35 Celsius.
The performance quoted in gearbox RD tables (pages 9 to 15) gives the service factor calculation as ratio between
gearbox maximum output torque M
2
and application torque M
(app)
.
Mass acceleration factor
Load classes
A - Uniform
load
k
(a)
0,2
B - Moderate shock load
0,2 < k
(a)
3
C - Severe shock load
3 < k
(a)
10A/h
A/h - Number of start/stops per hour
m
1
2
(a)
J
J
ir
J
k
2
Service factors