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ISO - International Organization
for Standardization

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Gear Reducer Terms

Actuator - A device that creates automatic motion by converting various forms of energy to rotary or linear mechanical energy.

Axial Movement – Also referred to as "endplay." The movement of the end of a motor or gear shaft. Usually measured in thousandths of an inch.

Backlash - A condition in which a speed reducer’s output shaft moves, but the input shaft remains motionless.

Cam – A rotating disk shaped to convert circular into linear motion.

Efficiency - The measurement, stated as a percentage, of a speed reducer’s ability to perform adequate speed reduction. Efficiency represents the comparison of power input and power output.

Endshield - The part of a motor that houses the bearing supporting the rotor and acts as a protective guard to the internal parts of the motor; sometimes called the endbell, endplate or end bracket.

Gear Ratio - With regard to speed reducers, the ratio that represents the comparison between the input speed of the gearmotor and the output speed of the gear head.

Horsepower - Is a unit of work equal to 33,000 foot pounds per minute, 550 foot pounds per second, or 746 Watts.

Hysterisis - The difference in the output state of a mechanical system with respect to input history; a component of bi-directional repeatability.

Input Horsepower - The amount of input power generated by a motor that a speed reducer can accept.

Lost Motion - Motion lost because of mechanical hysteresis, backlash, or torsion related stiffness in a rotational control system.

Mechanical Rating - The amount of power that a speed reducer can safely manage before the occurrence of overload.

Mounting Position - The placement of a speed reducer input shaft and output shaft.

Output Horsepower - The power that a speed reducer releases from the output shaft, which depends on the speed reducer’s efficiency.

Output Shaft - The part of the speed reducer to which the driven equipment is connected. The output shaft is responsible for the power transmission to the driven equipment.

Thermal Rating - A rating measuring a speed reducer’s continuous transmission of power.