ANSI/AGMA 6013-a06 pdf download.Standard for Industrial Enclosed Gear Drives.
The knowledge and judgement required to evaluate the various rating factors comes from years of accumulated experience in designing, manufacturing and operating gear units. Empirical factors given in this standard are general in nature. This standard is intended for use by the experienced gear designer. capable of selecting reasonable values for the factors. It is not intended for use by the engineering public at large.
Unit rating is based on the mechanical rating of all gear drive components determined with a unity service factor. In some applications, it may be necessary to select or design the drive to account for unusual application requirements which may include:
– reduced or increased reliability;
– extended or shortened life;
– intermittent operation;
– increased thermal capacity;
– increased external load capacity.
4.1 Momentary load
Gear drives designed and selected in accordance with this standard permit the following peak load conditions:
– each peak shall not exceed 200 percent of the unit rating (service factor or application classification, kSF = 1.0);
– a limited number of peak stress cycles. typically less than 1 O.
For applications exceeding these conditions an appropriate service factor should be selected.
WARNING: For momentary torques in excess of 200%. stall conditions, and low number of stress cycles the gear drive should be evaluated to assure the user of this standard that these conditions do not exceed the yield strength of any component.
Some applications may require selecting a gear drive with increased unit rating in order to accommodate adverse effects of environmental conditions, thermal capacity of the unit, external loading, or any combination of these factors such as overhung, transverse and thrust loads.
4.2 Rating factors
The allowable stress numbers for gear tooth ratings and the allowable stresses for component ratings are maximum allowable values. Less conservative values for these and other rating factors shall not be used unless expressly permitted in this standard. Material properties, manufacturing considerations or experience may indicate that more conservative rating factors be used.
4.3 System analysis
This standard assumes that within the operating speed range. the system of connected rotating parts is compatible and free from critical speeds and torsional or other types of vibration, no matter how induced. The gear drive designer or manufacturer is not responsible for the system analysis.
4.4 MetallurgIcal considerations for cold temperature operation
If units are to be operated below -22° F. care must be given to select materials which have adequate impact properties at the operating temperature. Consideration should be given to:
— low temperature impact strength;
— fracture appearance transition or nil ductility temperature specification for impact testing;
— reducing carbon content to less than 0.4 percent;
— use of higher nickel alloy steels.ANSI/AGMA 6013 pdf download.