GBX1600121084D — planetary gearbox with a 12:1 step-down
The Schneider Electric GBX1600121084D is a planetary gearbox from the GBX family, 160 mm outside diameter, with a 12:1 reduction ratio and straight-cut gearing — the drop-in reducer for a Lexium servo where the motor speed has to come down and the torque has to go up. Efficiency is listed at 94 % and the housing is black anodized aluminium around a C45 shaft, so the box is built to live on a machine frame, not in a cabinet — the IP54 rating applies at the shaft output, which keeps splash and dust off the seal where it actually matters.
Torque envelope and shaft loading
Continuous output torque is rated at 800 N.m and the maximum output torque is 1280 N.m, meaning the gearbox will hold steady-state load at the lower figure and absorb peaks roughly 60 % higher before the rating gives way. Maximum radial force Fr on the output shaft is 4200 N at 100 rpm over a 30000 h life at 30 °C, climbing to 6000 N if the duty is capped at 10000 h; maximum axial force Fa is 6000 N over the same 30000 h envelope and 8000 N over the shorter 10000 h envelope — the hour rating decides the load the shaft will take, not the headline force number. Service life is quoted at 30000 h at 100 rpm at 30 °C, and the gearbox ships lubricated for life, so the MRO planner is not opening it up for grease on the scheduled route.
Precision, stiffness, and the operating envelope
Maximum torsional backlash is 10 arc.min and torsional rigidity is 41 N.m/arcmin — enough stiffness for point-to-point motion on a packaging or indexing axis where a sloppy reducer shows up as a lag in the servo loop. Moment of inertia at the input is 12.37 g.cm², which keeps the reflected load back to the servo drive low; ambient operating range is -25...90 °C and the box mounts in any position, so the cable dress on the machine is what picks the orientation, not the gearbox. Noise level is 70 dB at 1 m under no-load, which is the figure to compare against an enclosure or line-side noise survey when the gearbox lands inside a workstation.
Sourcing posture — active production, quoted per BOM
For MRO and project-build quantities the gearbox is sourced through independent distribution and quoted to order against the RFQ, with current price and lead time confirmed at quote time; no figure is published here.