GU-A75 Vertical Agitator Drive

A vertical mixer drive rated on the bending moment, not just the torque. The output bearing pair is spread wide enough to carry the overhung moment of a long impeller shaft plus the axial thrust of the fluid.

How this frame is rated

The GU-A75 carries 2,400 Nm of rated output torque, calculated on tooth flank and root capacity to international gear rating standards at a service factor of 1.0. Ratios run from i 12.6 to i 420, which at 1450 rpm input puts the output shaft between 3.5 and 115.1 rpm. Motors from 1.1 to 22 kW bolt to the input.

With the largest listed motor the frame reaches its mechanical torque limit at about i 17.6. Below that ratio the motor governs and output torque still climbs with the reduction; above it the frame governs, and extra ratio buys you speed reduction only. That is the knee you can see on the characteristic chart further down this page.

What usually decides the selection

Thermal capacity is 24.5 kW of continuous throughput without auxiliary cooling at 20 °C ambient. Permissible radial force at the shaft mid-point is 26,000 N; move the load towards the shaft end and that figure falls quickly, so tell us where the pulley actually sits. Housing is Nodular cast iron, protection IP66, and the unit weighs 285 kg dry.