GBX planetary gearbox sized for a 5:1 reduction at 160 mm
The Schneider Electric GBX1600051385D is a planetary gearbox in the GBX series, with a 160 mm gearbox external diameter and a 5:1 reduction ratio driving a straight-tooth stage. It is built around a C 45 steel shaft in a black anodized aluminium housing, lubricated for life, and it can be mounted in any position. Class fit: a planetary stage on this diameter is the right pick when the driven machine needs high torque density, low torsional backlash, and a compact in-line footprint rather than a right-angle bevel or worm arrangement.
Torque envelope and torsional numbers a buyer actually checks
Maximum output torque is 720 N·m with a continuous output torque of 450 N·m, and the maximum torsional backlash is 6 arc.min — so the part is positioned for servo-driven axes where positioning repeatability matters more than for an open-loop conveyor. Torsional rigidity is 38 N.m/arcmin, the metric that decides how much the output twists under load and how tightly the downstream controller can hold position during a transient. Efficiency is 96 %, so a 5:1 reduction that absorbs only 4 % of the mechanical power keeps the motor's continuous current draw honest on a long-duty cycle. Noise level is 70 dB at 1 m on a no-load reading — quiet enough for an operator station, but the loaded reading near the motor will read higher on the floor.
Shaft loads and the service-life window
Maximum radial force Fr is 4200 N at 100 rpm applied at mid-distance from the output shaft over 30000 hours at 30 °C, rising to 6000 N if the duty is limited to 10000 hours — the lower figure is the one that should drive the bearing-life calculation, not the higher peak. Maximum axial force Fa follows the same dual-rating logic: 6000 N over 30000 hours at 30 °C and 8000 N over 10000 hours at 30 °C, both at 100 rpm. Service life is rated 30000 hours at 100 rpm at 30 °C, with an operating ambient of -25 °C to 90 °C — wide enough for an outdoor or unconditioned cabinet, though hot-mount drives derate below the headline torque. The shaft output carries an IP54 rating, so the seal protects against splash and dust ingress at the seal lip, not against pressure wash-down — for washdown food lines a higher-rated seal stage belongs in the BOM.