Planetary gearbox, 80 mm, 5:1 — torque and backlash profile
The GBX0800050552F is a straight-tooth planetary gearbox from Schneider Electric's GBX series, 80 mm outer diameter, with a 5:1 reduction ratio. It delivers 110 N.m continuous output torque at 100 rpm and 30 °C, with a maximum of 176 N.m under the same conditions. Torsional backlash is rated at 9 arc.min maximum — this is the angular play between input and output under reversal, a key parameter for positioning accuracy in indexing or pick-and-place axes. Torsional rigidity is 6 N.m/arcmin, meaning the gearbox deflects 1 arcmin for every 6 N.m of applied torque.
Load ratings and service life — what drives the selection
Rated service life is 30,000 hours at 100 rpm and 30 °C — this is the L10 life at the continuous torque rating. The gearbox is lubricated for life, so no maintenance interval for grease changes. Maximum radial force Fr is 650 N at mid-shaft for 30,000-hour life, or 950 N for a 10,000-hour duty cycle. Maximum axial force Fa is 1200 N for 10,000 hours, derated to 900 N for the full 30,000-hour target. These limits govern bearing selection when coupling to a belt, chain, or direct-drive load. Efficiency is 94 % — the 6 % loss is mostly gear mesh friction and bearing drag at rated torque. Noise level is 60 dB at 1 m, no-load, which is typical for a precision planetary stage of this size.
Sourcing reality — obsolete, quoted to order
Schneider Electric lists the GBX0800050552F as obsolete. Available through independent surplus and broker channels.