Torque ratings: continuous vs peak
The GBX1600200844D: Continuous output torque is 800 N.m — this is the thermal limit for sustained operation; size the driven load so the average torque stays below this figure. Maximum output torque is 1280 N.m, covering peak loads during acceleration or momentary overloads without mechanical failure. The 20:1 reduction ratio multiplies input torque by 20 (less efficiency losses), so the motor-side torque requirement is roughly 1/20th of the output torque. At 94% efficiency, about 6% of the input power is lost as heat in the gearbox.
Service life and load capacity
Rated service life is 30000 hours at 100 rpm output speed and 30 °C ambient — this is the L10 life under rated load. The gearbox is lubricated for life, so no maintenance re-greasing is needed; the sealed design means the lubricant cannot be replenished. Maximum axial force on the output shaft is 6000 N at 100 rpm for the 30000-hour life, or 8000 N for a 10000-hour life. Maximum radial force is 4200 N at 100 rpm for 30000 hours, or 6000 N for 10000 hours — these are the shaft bearing limits for overhung loads like belt drives or chain sprockets.
Backlash and stiffness for positioning
Maximum torsional backlash is 10 arc.min — the angular play in the output shaft under torque reversal. For servo positioning applications, this sets the repeatability floor; a 10 arc.min backlash at the output translates to about 0.17° of lost motion. Torsional rigidity is 41 N.m/arcmin, meaning the gearbox twists 1 arcmin for every 41 N.m of applied torque — this stiffness affects the servo loop gain and system resonance frequency.
Environmental and mechanical integration
IP54 protection at the shaft output — dust-protected and splash-resistant, suitable for most factory-floor environments but not washdown or submerged service. The gearbox can be mounted in any position, simplifying mechanical layout. Housing is black anodized aluminium — lightweight and corrosion-resistant, with good thermal conductivity to dissipate the 6% power loss as heat. Shaft material is C 45 medium-carbon steel, standard for gearbox output shafts. Gearbox external diameter is 160 mm, matching the GBX series frame size.