Atlas Copco Air Motors

LZL Vane motor/gear unit
combinations
Combined with helical or worm gear units,
type LZL vane air motors can be used over a
very wide torque and speed range. Models are
nominally available with gear ratios that range
from 8:1 to 240:1, corresponding to a speed
range of 460 to 10 r/min and an output torque
of up to 5000 Nm.
Helical gear units type HG.
Helical gear units are available in 2-stage and 3-stage configurations.
They deliver high efficiency levels and are available in
wide choice of ratios, Figure 22.
Worm gear units type BS
Figure 22
Worm gear units are smaller and lighter in operation than
helical gear units. However, they offer lower levels of efficiency.
Where the highest gear ratios are required, it should
be noted that starting efficiency can be as low as 30% ,
Figure 23.
A hollow shaft can be obtained by taking out the cylindrical
output shaft for BS 50, BS 63 and BS 71.
Figure 23
Note. Gear units with different reduction ratios can be supplied to special
order. For comprehensive information on these versions, please contact
your local Atlas Copco representative.
5 4 AT L A S C O P C O A I R M O T O R S
Shaft loading
Motors with helical gear units
The maximum allowable radial load on the output shaft of
each gear unit, at the half way point on the shaft can be
obtained from the data tables for each model.
The maximum permitted axial load is 50% of the radial load.
All units will accept 100% momentary overloads on above
stated capacities
Motors with worm gear units
Worm gear units have individual output shafts and the allowable
radial load is therefore different for each version. The
maximum allowable radial load, at the half way point on the
shaft, is stated in the worm gear data tables on page 62, 64
and 66.
If the load is applied at another point on the shaft, the allowable
radial load can be calculated by multiplying the stated
value by the factor indicated by Figure 25. The permitted axial
load is 40% of the radial load.
1.2
E / 2
1
E
0,5
Figure 25