Gearboxes Series RS & RT - Varvel

Gearboxes Series RS & RT
Product description
Two stage worm gear boxes RS/RS and RT/RT
The gearboxes, RS/RS and RT/RT series, are made up of two gearboxes RS or RT and offer a full selection
of high reduction ratios to obtain lower output speeds.
Output shafts AS and AD
All gearboxes are manufactured with hollow output shaft as standard. Optionally, a single AS or double AD
solid output shaft - made of steel C43 - can be supplied.
An ASC safety shield for the opposite side of a single output shaft AS, is available on demand.
Torque arms BR/BRV and BT/BTV
Standard gearboxes are normally supplied with covers on each side for attaching a torque arm when gearboxes
have to operate as shaft mounted units.
The torque arm, standard or with Vulkollan vibration-damping, is made of extra thick plate and white galvanized
Torque limiters TLI and TLE
The torque limiter and safeguard device - TLI built-in inside the gearbox and TLE fitted outside - allows easy
torque adjustments, full gearbox safeguard against unexpected overload conditions, simple hand release,
and manual operation in case of power supply failure.
The factory preset slipping torque can be adjusted from the maximum preset torque down to zero. Shaft rotation
restarts automatically as soon as torque value is lower than the preset value.
Oil quantity of torque limiter TLI are listed at page 42 and 50.
Travel limiters SL
The SL travel limiter device stops - by means of built-in limit switches - the gear-box after a given operation
time.
Standard thread allows approx. 40 turns of the output shaft. Limit switch travel is adjustable and operation
time varies upon the used reduction ratio from min. 12 to max. 170 seconds .
Directive ATEX
The gearboxes VARVEL-ATEX, delivered on demand, are designed and manufactured according to Directive
94/9/CE “ATEX” and therefore, they are qualified for installation in potentially explosive atmospheres:
Zones of Group II,
Category 2 (or 3),
Explosion hazard with gas presence (Zone 1 or 2),
Explosion hazard with combustible dust presence (Zone 21 or 22).
The units VARVEL-ATEX are identified by the additional marking :
II 2 GD ck IP66 T max =135 °C
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