What the 9:1 reduction and 16.5 N.m continuous torque mean for your motor
The GBX0400090582D is a 40 mm planetary gearbox with a 9:1 reduction ratio — for every 9 motor revolutions, the output shaft turns once. That multiplies motor torque by roughly the ratio, minus the 94 % efficiency loss, so a motor delivering 2 N.m at the input sees about 17 N.m at the output shaft. Continuous output torque is 16.5 N.m; the gearbox can handle peaks up to 26 N.m for short-duration loads. The continuous figure is the one to size against — exceeding it for sustained periods shortens the 30,000-hour service life at 100 rpm and 30 °C.
Backlash, stiffness, and positioning precision
Maximum torsional backlash is 35 arcmin — that is the angular play between input and output when the direction reverses. For a 9:1 gearbox this is a standard commercial-grade figure; if your application indexes to a hard stop or reverses frequently, budget for that lost motion in the position loop. Torsional rigidity is 1.1 N.m/arcmin — the shaft twists 1 arcmin for every 1.1 N.m of applied torque. This stiffness keeps windup low under steady load but matters most during acceleration where the reflected inertia (0.03 g.cm² at the input) resists the motor's torque ramp.
Mounting, sealing, and environmental limits
Mounts in any position — horizontal, vertical, or angled — with no derating. The black anodized aluminium housing is corrosion-resistant for indoor machine builds; the shaft output seal is rated IP54, meaning it keeps out dust and splashing water but is not submersible. The gearbox is lubricated for life, so there is no oil-change interval to schedule. The C 45 steel output shaft handles axial loads up to 200 N and radial loads up to 200 N (both at 100 rpm, mid-span, 10,000-hour life target).
Noise, efficiency, and service life trade-offs
Noise level is 55 dB at 1 m, no-load — quiet enough for a packaging line or lab environment. The straight-tooth cut is inherently noisier than helical at higher speeds, but at the output speeds this 9:1 ratio produces from a typical servo motor (300–600 rpm output), the noise stays within that 55 dB envelope. Rated service life is 30,000 hours at 100 rpm output speed and 30 °C ambient. Derate the life if running at higher speeds, higher ambient temperatures, or continuous torque above 16.5 N.m — the axial and radial force ratings drop from 200 N to 160 N when extending life from 10,000 to 30,000 hours.