Gearbox terminology

Rated torque continuous

Maximum torque load that can be applied to the output shaft for continuous operation under ideal installation conditions.  The service life may be compromised if the torque load exceeds this rated value.

Rated torque intermittent

Maximum torque load that can be applied to the output shaft for intermittent operation under ideal installation conditions.  The definition of intermittent operation is 10% of the service life. The service life may be compromised if the torque exceeds the published value.

Maximum efficiency at rated torque

The maximum efficiency will be achieved at the rated continuous torque load with proper lubrication. Lower torque loads decrease the efficiency. If speed is reduced, the efficiency will then remain relatively constant.

Average backlash at no load

The backlash is defined as the recoil angle of the output shaft, when the gearbox input pinion is locked in a fixed position. The recoil angle is the angle through which the output shaft can be rotated back and forth with this condition. The amount of torque used for this validation test is 1-2% of the rated continuous torque.

Maximum radial load

Sudden intermittent hits or impacts can exceed this load value and thereby also compromise the service life. The maximum radial load is the maximum load that can be applied radially (perpendicular) to the output shaft at the middle of the shaft. This load value is based upon an output shaft reference speed of 100 RPM. The service life may be compromised if this load value is exceeded. 

Maximum axial load

The maximum axial load is the maximum load that can be applied axially to the output shaft. This load value is based upon an output shaft reference speed of 100 RPM. The service life may be compromised if this load value is exceeded.  Sudden hits or impacts can easily exceed this load value and thereby also compromise the service life.

Maximum continuous rated speed at drive

The maximum continuous rated speed is the maximum speed in revolutions per minute (RPM) at the gearbox input for continuous operation under ideal installation conditions. The service life may be compromised if the speed exceeds this rated value.

 Maximum intermittent rated speed at drive

The maximum intermittent rated speed is the maximum speed in revolutions per minute (RPM) at the gearbox input for intermittent operation under ideal conditions. The definition of intermittent operation is 10% of the service life. The service life may be compromised if the speed exceeds this rated value.

Type Standard

The type standard is the standard design version for each model series with regard to average backlash and torque rating. It utilizes synthetic gears in the first stage, which offers the advantage of reduced noise. Steel gears are used in the second and third stages if applicable.

Type V Heavy Duty

Unlike the standard design version, the heavy duty version also uses planetary gears made of steel in the first stage. This provides higher torque capability with a backlash rating equivalent to the standard version. The heavy duty version is not ideal for continuous operation.

Type R Reduced Backlash

The reduced backlash version is similar to the standard version with synthetic gears in the first stage, except with a smaller recoil angle.

Type S Low Backlash

The low backlash version offers the smallest recoil angle. The planetary gears of the low backlash version are always made of steel. The low backlash version is not ideal for continuous operation.