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

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Appendix A: Glossary of Terms
Page A–3 IronHorse® Helical Gearbox User Manual – 1st Ed. Rev. B
Overhung Load
A force applied at right angles to a shaft beyond its outermost bearing. This shaft-bending load
must be supported by the bearing. Overhung load ratings are listed for each gearbox size, and
should not be exceeded. Some applications require the gearbox Overhung Load rating to be
reduced by a K Factor and/or a Service Factor.
Overhung Load Factor
Also called K 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 Overhung Load Factor either to increase the calculated
overhung load, or to reduce the gearbox overhung load rating.
Prime Mover
In industry, the prime mover is most often an electric motor. Occasionally engines, hydraulic or
air motors are used. Special considerations are called for when other than an electric motor is the
prime mover.
Self-Locking
The inability of a reducer to be driven backwards by its load. No IronHorse helical gearbox should
be considered self-locking.
Service Factor (for gearbox)
A constant used to modify the Mechanical Rating of a gearbox based on the duration of service
and characteristics of the driven load. Use the Service Factor either as a multiplier to increase the
calculated loads, or as a divisor to reduce the gearbox Mechanical and Overhung Load ratings.
Service Factor (for motors)
Refers to a motor’s ability to handle a load greater than the motor’s rated horsepower on a
continuous basis.
Speed Reducer
Also called a Gearbox. An enclosed set of gears used in mechanical power transmission to reduce
speed and increase torque.
Thermal Ratings
The power or torque a gearbox can transmit continuously. These ratings are based upon the
cast-iron gearbox’s ability to dissipate the heat caused by friction.
Thrust Load
Forces along the axis of the output shaft, usually encountered in vertical-drive applications.