GU-H37 Helical Inline Gear Unit

The smallest frame in the inline range. A two or three stage helical train in a ribbed grey iron housing, sized for packaging lines, dosing screws and small conveyors where the drive has to disappear into the machine frame.

How this frame is rated

The GU-H37 carries 130 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 3.83 to i 134.82, which at 1450 rpm input puts the output shaft between 10.8 and 378.6 rpm. Motors from 0.12 to 3 kW bolt to the input.

With the largest listed motor the frame reaches its mechanical torque limit at about i 6.9. 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 5.6 kW of continuous throughput without auxiliary cooling at 20 °C ambient. Permissible radial force at the shaft mid-point is 3,900 N; move the load towards the shaft end and that figure falls quickly, so tell us where the pulley actually sits. Housing is Grey cast iron, protection IP65, and the unit weighs 26 kg dry.