Planetary gearbox for 40 mm servo or stepper motor integration
The GBX0400051003F is a 40 mm-diameter planetary gearbox with a 5:1 reduction ratio, designed to mount directly to a motor face and multiply output torque while reducing speed. Continuous output torque is 14 N.m at 100 rpm and 30 °C, with a maximum intermittent torque of 22 N.m at the same speed — the continuous figure governs the steady-state load the gearbox can carry without overheating or accelerated wear. The straight-tooth planetary design delivers 94 % efficiency, meaning 6 % of the input power is lost as heat inside the housing; this matters for thermal management in a confined enclosure or when the duty cycle is high.
Load limits and service life at rated conditions
Rated service life is 30000 hours at 100 rpm and 30 °C — the design-life anchor for maintenance planning. The gearbox is lubricated for life, so no field relubrication is required over that interval. Maximum axial force on the output shaft is 200 N for a 10000-hour life, dropping to 160 N for the full 30000-hour rating. Maximum radial force applied at mid-span on the output shaft follows the same derating: 200 N at 10000 hours, 160 N at 30000 hours. These limits govern overhung loads from belt drives or direct gear meshes. Torsional rigidity is 1 N.m/arcmin — the shaft twist under load is 1 arcminute per N.m of applied torque. Maximum torsional backlash is 24 arcminutes, which sets the positioning repeatability floor for the gear train in reversing or start-stop applications.
Environmental ratings and mechanical construction
Shaft output sealing is rated IP54, meaning the gearbox is protected against dust ingress and splashing water at the output shaft — suitable for dry indoor environments but not washdown or outdoor exposure without additional shielding. The housing is black anodized aluminium for corrosion resistance and heat dissipation; the shaft is C 45 medium-carbon steel. Noise level is 55 dB measured at 1 m under no-load conditions — quiet enough for operator-adjacent machinery but not silent; the straight-tooth design is inherently noisier than helical gearing at higher speeds.
Lifecycle status and sourcing for this obsolete gearbox
Available through independent surplus and broker channels. No direct OEM stock or lead-time commitment applies.