Lifecycle reality — obsolete, sourced through surplus
The GBX0400120402D: For a line-down situation or BOM freeze, this unit is available through independent surplus and broker channels.
12:1 planetary reduction — torque and stiffness
Planetary gearbox with straight teeth, 40 mm outer diameter, delivering a 12:1 reduction ratio. Maximum output torque is 32 N.m — that is the continuous load ceiling; sizing the driven load below this number keeps the gearset within its rated service life. Torsional rigidity is 1.1 N.m/arcmin, and maximum torsional backlash is 35 arc.min. For positioning applications where lost motion on reversal matters, that backlash figure tells you the angular play at the output shaft under no load — budget it into the system accuracy.
Rated life and operating envelope
Service life is 30000 hours at 100 rpm at 30 °C ambient — this is the design anchor for the gearset and lubrication. The gearbox is lubricated for life, so no field maintenance on the oil; the operating ambient range is -25 to 90 °C. Maximum radial force on the output shaft is 200 N at 100 rpm (mid-shaft, 10000 h life) and 160 N at 100 rpm for the full 30000 h life. Maximum axial force is 160 N at 100 rpm over 30000 h. These force limits govern the overhung load from a belt, chain, or gear — stay under them to hit the rated life.
Efficiency and noise
Rated 94 % efficiency — about 6 % of input power is lost as heat in the gear mesh and bearings. Noise level is 55 dB at 1 m, no-load, which is quiet enough for most machine-side environments without additional acoustic enclosures.
Mounting and ingress protection
Mountable in any position — the lubrication system is sealed and position-independent. Shaft output is rated IP54, meaning the output seal is protected against dust ingress and splashing water; the housing is black anodized aluminium, shaft material is C 45 steel.