Benzlers Tecostyle

Service factor f b
Daily operations in hours 4 hours 8 hours 16 hours 24 hours
Starts per hour 200 200 200 200
Load classification
I 0.8 0.9 1.0 0.9 1.0 1.1 1.1 1.2 1.3 1.3 1.4 1.5
I a 1.1 1.2 1.3 1.1 1.3 1.5 1.3 1.5 1.6 1.4 1.6 1.8
II 1.3 1.4 1.6 1.3 1.6 1.8 1.4 1.7 1.9 1.5 1.8 2.0
III 1.5 1.6 1.8 1.6 1.8 2.0 1.7 1.9 2.1 1.8 2.0 2.2
Ambient temperature factor f t
For other ambient temperatures then 20° C, always multiply the thermal rating with the following factors.
°C Celsius - 40 - 30 - 20 - 10 +/- 0 10 20 30 40 50
ft 1.80 1.67 1.53 1.40 1.27 1.13 1.00 0.87 0.73 0.60
Fan factor f f
If the gearbox has no fan and the motor is not directly flanged to the gearbox, multiply the thermal rating with the
following factors.
Input speed n1 (rpm) 10 100 300 750 1 000 1 500 3 000
f f
1 0.95 0.74 0.63 0.65 0.69 0.77
Control points
The forces allowed on the gear shafts are determined by
bearing life and strength on gear shafts and housing.
Radial forces at no thrust loads.In the power ratings page
12-24 max. allowed radial force on output shaft is given
for each output speed. The value is only valid if the force
is applied at the centre of the output shaft.If the force is
applied at another position the allowed radial force is
given by the following:
Radial forces
Bearing life: F r,x =
a
(f + x)
F r2
Strength on shaft F r,x = c F r2
x
Strength on d
F r,x =
gear housing: (g + x)
F r2max
F r
F r,x
c
x
F r,x
F r2
F r2max
= Max. radial force (N)
= Radial force acc to power ratings (N).
= Upper limit, for radial force. Can not
be exceeded (N)
a, d, f, g = Internal measures (mm)
x = Distance to radial force (mm)
c = Half shaft length (mm)
Type/Size a c d f g F r2max (N)
BS 35 77.5 18 88.0 59.5 70.0 2 000
40 90.5 18 101.5 72.5 83.5 2 000
50 96.5 21 110.0 75.5 89.0 2 700
63 107.0 29 122.0 78.0 93.0 4 000
71 127.5 29 142.5 98.5 113.5 5 000
88 152.5 41 181.0 111.5 140.0 10 000
112 175.0 41 210.5 134.0 169.5 15 000
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