General Dynamics SATCOM Technologies KX 120, Руководство по эксплуатации и техническому обслуживанию

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600-1152A 3
2.3 Elevation Drive Assembly
Basic characteristics of the elevation drive assembly:
a.
Anti-Backlash Worm gear screw jack: Joyce Model AWJ1135-90 7/8
•
Capacity: 35 Tons.
•
Ratio: 11:1, 16 revolutions of the input shaft for 1 inch of jack extension
or retraction.
•
Jack stroke: 94 ¾ inches with rod end and stop sleeve installed.
•
Travel limits: External stop nut attached to the ends of jack screw.
b.
Gearmotor: For job specific information, refer to the Print Pack shipped with the
antenna.
2.4 Azimuth Drive Assembly
Basic characteristics of the azimuth drive assembly:
a.
Anti-Backlash Worm gear screw jack. Joyce Model AWJ1175-139 1/2
•
Capacity: 75 tons.
•
Ratio: 11:1 ratio, 16 revolutions of the input shaft for 1 inch of jack
extension or retraction.
•
Jack stroke: 139 ½ inches with rod end and stop sleeve installed.
•
Travel limits: External stop nut attached to ends of jack screw.
b.
Gearmotor: For job specific information, refer to the Print Pack shipped with the
antenna.
2.5 Polarization Drive Assembly
(For LP Feeds With External Pol Drive Only)
Polarization rotation is accomplished by a motorized chain drive attached to the feed
support tube. The feed support tube turns on three (3) V-grooved rollers.
The drive assembly is powered by an electric motor that drives a dual-stage reduction
right-angle gear reducer with two (2) output shafts. A drive sprocket is attached to one
output shaft. The remaining output shaft drives an additional speed reducer (5:1) which
is coupled to the polarization drive transducer.
In this manner, a 1:1 ratio is obtained between the rotation of the feed tube (as turned by
the chain and drive sprocket) and the transducer. A limit switch provides an electrical
interlock.
Polarization drive speed is nominally 1° /sec.
2.6 Couplings
The gear motors are coupled to screw jacks with three-jaw finished bore couplings and
elastomer inserts. With the jaw-engaging couplings, there is no alignment necessary.
Each half is installed on its respective shaft. The insert is placed into either half and the
engagement is made when the gearbox is mated with its adapter flange.