AutomationDirect IronHorse HGR-37-005-A, Руководство пользователя

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Page A–2 IronHorse® Helical Gearbox User Manual – 1st Ed. Rev. B
Appendix A: Glossary of Terms
Glossary of Gearbox Terms
Axial Movement
Often called “endplay.” The endwise movement of motor or gear shafts. Usually expressed in
thousandths of an inch.
Back Driving
Driving the output shaft of a gearbox to increase speed rather than reduce speed. Helical
gearboxes are not suitable for service to increase speed.
Backlash
Rotational movement of the output shaft clockwise and counter clockwise, while holding the
input shaft stationary. Usually expressed in thousandths of an inch and measured at a specific
radius at the output shaft.
Efficiency
A ratio of the input power compared to the output power, usually expressed as a percentage.
Flanged Reducer
Usually used to refer to a gearbox having provisions for close coupling of a motor either via a
hollow (quill) shaft or flexible coupling. Most often a NEMA C-face motor is used.
Gearbox
Also called a Speed Reducer. An enclosed set of gears used in mechanical power transmission to
reduce speed and increase torque.
Helical Gear
Parallel axis gear that features teeth that are cut at an angle to allow for smooth and quiet
operation.
Input Power
The power applied to the input shaft of a gearbox. There are separate ratings for Mechanical Input
Power, Thermal Input Power, and Nominal Motor Horsepower.
K Factor
Also called an Overhung Load Factor. A constant used to modify the overhung load rating of a
gearbox based on the type of load applied on the shaft. Use the K factor either to increase the
calculated overhung load, or to reduce the gearbox overhung load rating.
Mechanical Ratings
The maximum power or torque a gearbox can transmit based on the strength and durability of
its components. Some applications require the gearbox Mechanical Ratings to be reduced by a
Service Factor.
Mounting Position
The relationship of the input and output shafts of a gearbox relative to horizontal.
Nominal Motor Horsepower
The highest horsepower 1800 rpm motor that can be used with the gearbox under 1.0 service
factor conditions. This rating decreases as the motor speed decreases, and as the service factor
increases.
Output Horsepower
The amount of horsepower available at the output shaft of a gearbox. Output horsepower is
always less than the input horsepower due to the efficiency of the gearbox.