16:1 planetary gearbox — 20 N.m continuous, 94 % efficient
The GBX0400160571G is a straight-tooth planetary gearbox from Schneider Electric's GBX series, 40 mm external diameter, with a 16:1 reduction ratio. It delivers 20 N.m continuous output torque at 100 rpm and 30 °C, with a maximum of 32 N.m at the same speed and temperature. Efficiency is listed at 94 %, and noise at 55 dB at 1 m under no-load — the straight-tooth design trades some acoustic smoothness for cost and simplicity compared to helical alternatives.
Load ratings and service life — what the numbers mean for your axis
The 20 N.m continuous torque is the figure to design to for steady-state positioning or constant-speed conveying. The 32 N.m maximum covers acceleration peaks and occasional overloads, but the service life of 30000 hours at 100 rpm and 30 °C is tied to the continuous rating — run it at the maximum continuously and you shorten that life. Maximum axial force (Fa) is 200 N at 100 rpm for a 10000-hour life, dropping to 160 N for the full 30000-hour target. Radial force (Fr) follows the same curve: 200 N at mid-shaft for 10000 hours, 160 N for 30000 hours. These are the limits for belt-drive or overhung-load applications — stay under them to hit the rated lifespan. Torsional rigidity is 1.1 N.m/arcmin — this tells you how much the gearbox twists under load. For a 20 N.m continuous torque, expect about 18 arcmin of windup (20 ÷ 1.1). Backlash is specified at a maximum 28 arcmin, so total positioning error from the gearbox alone can reach 46 arcmin under full load. Factor this into your system accuracy budget.
Obsolete — what that means for procurement
Schneider Electric has marked the GBX0400160571G as obsolete. This part is available through independent surplus and last-time-buy channels — quantities are lot-specific and confirmed at RFQ. The gearbox is lubricated for life and sealed to IP54 at the shaft output, so it requires no maintenance over its 30000-hour service life. Mounting position is unrestricted — any orientation works. The black anodized aluminium housing with C 45 steel shaft is standard for this class of planetary reducer.