4:1 planetary reduction with 96 % efficiency
The GBX0800040841D is a straight-tooth planetary gearbox from Schneider Electric's GBX series, 80 mm diameter, delivering a 4:1 reduction ratio. It is rated for 115 N.m continuous output torque and 184 N.m maximum, with 96 % efficiency — meaning under 4 % of input power is lost to gear mesh friction and bearing drag, which keeps the thermal rise low in continuous-duty cycles.
Torque, loads, and service life at 30 °C
Continuous output torque is 115 N.m, with a maximum of 184 N.m for intermittent peaks. The gearbox is rated for 30000 hours of service at 100 rpm and 30 °C ambient — a realistic life target for a positioning axis or conveyor drive running a single shift. Maximum axial force on the output shaft is 1200 N at 100 rpm for the first 10000 hours, derating to 900 N for the full 30000-hour life. Radial force at mid-shaft is 650 N for 30000 hours, or 950 N if the duty cycle only demands 10000 hours. These load limits are interdependent with speed and temperature; the 30 °C baseline means derating is needed above that ambient. Torsional rigidity is 6 N.m/arcmin — the shaft wind-up under load is predictable for positioning applications. Maximum torsional backlash is 12 arcmin, which suits general motion control but not zero-backlash indexing. Moment of inertia is 0.52 g.cm², low enough that the reflected inertia back to the motor does not dominate the acceleration torque budget in a servo loop.
Build, sealing, and mounting flexibility
Housing is black anodized aluminium; the output shaft is C45 steel — standard for this class. IP54 at the shaft output means it resists dust ingress and splashing water, but it is not rated for washdown or submersion. The gearbox is lubricated for life, so no oil-change schedule. Mounting position is any orientation, which simplifies layout in a crowded panel or machine frame. Operating ambient range is -25 to 90 °C, covering most indoor industrial environments and cold-storage applications down to -25 °C. Noise level is 60 dB at 1 m, no-load — roughly the sound of a quiet office HVAC unit. Under load the noise will rise with torque and speed, but the straight-tooth profile is inherently louder than helical; for noise-sensitive environments, a helical planetary would be quieter at the same ratio.