Helical Gearboxes RD - Varvel SpA
Helical Gearboxes RD - Varvel SpA
Helical Gearboxes RD - Varvel SpA
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OHL - OVERHUNG LOADS - OUTPUT [lb]<br />
Overhung (radial) loads have to be checked with the rating factor Fr2 given in the selection<br />
tables.<br />
Each transmission element fitted on the gearbox output shaft gives its own transmission<br />
element factor k(t) according to the following table.<br />
- Application OHL<br />
k(t) Transmission Element<br />
1.15 Gear - Tooth No. < 17<br />
1.40 Chain sprocket - Tooth No. < 13<br />
1.25 Chain sprocket - Tooth No. < 20<br />
1.00 Chain sprocket - Tooth No. > 20<br />
2.50 V-belt pulley<br />
1.25 Toothed belt pulley<br />
- Catalogue OHL at mid shaft Fr2 Fr<br />
Catalogue value to be greater than application OHL<br />
<strong>RD</strong> 0 1 2 3 4 5 6<br />
a [inch] 0.69 0.79 0.98 1.18 1.38 1.57 1.97<br />
a [mm] 17.5 20 25 30 35 40 50<br />
- OHL offset from gearbox centre Fr2b(x)<br />
Fr<br />
* or ** values as appropriate<br />
to be greater than application OHL<br />
* c<br />
Fr2b(x)<br />
Fr2<br />
<br />
x b<br />
**<br />
<strong>RD</strong> 0 1 2 3 4 5 6<br />
a [inch] 0.69 0.79 0.98 1.18 1.38 1.57 1.97<br />
b [inch] 0.61 0.91 0.94 1.06 1.22 1.46 1.54<br />
c [inch] 1.30 1.69 1.93 2.24 2.60 3.03 3.50<br />
AXIAL LOADS - OUTPUT<br />
Axial load values are assumed to be 20% of OHL, either on tensile<br />
and compressive stress, besides OHL itself.<br />
- 17 -<br />
2 M<br />
F <br />
D<br />
2<br />
r k(<br />
t)<br />
Fr<br />
Fr<br />
2s(x)<br />
2s(x)<br />
Fr<br />
Fr<br />
2 <br />
F <br />
Fr2<br />
a2 <br />
a<br />
x<br />
0.2<br />
<strong>Helical</strong> <strong>Gearboxes</strong> <strong>RD</strong><br />
D<br />
Fa2<br />
Fr2<br />
EXTERNAL LOADS<br />
Fr2<br />
x<br />
Fr2<br />
a