AGMA 901-A92 pdf free download.A Rational Procedure for the Preliminary Design of Minimum Volume Gears.
The terms used, wherever appkable. conform to the following standards:
ANSI Yl 0.3—I 968, Letter Syiribois for Quantities
Used b Mechank,s of Solkis
ANSLAGMA 1012-F90. Gear MmencIature.
Definitions of Terms with Syirois
AGPM 904-889, Metric Usage
2.2 Symbols
The symbols used m this inloirnahon sheet are showntable 1.
NOTE -The syno4s, definthons d temiiology used in this iiforrnation sheet may differ from other AGMA publicions. Th. user should not assume that famihar syrthols can be used wthoul a careful study of thee. d.ttnthons.
3 Input variables
This clause discusses the signicant parameters relating to a preferred gear desii. It is not intended to be all inckjslve. but to be Fuied by the scope of this Wormahon sheet.
3.1 Materials arid h.at tr..tm.nt
Many materials have been used in gearing, bid the most common today is steel. This dormation sheet only applies to steel gearing. Them are t commonly used types of heat treatment for steel gear materials, surface hardening and through hardening. The choice of steel alby must be corrçatt4e with the chosen heat treatment process.
3.1.1 Surface hardening
Surface hardening takes place after tooth cutting, usually on gears made from hot rolled bar or forged steel.
3.1.1.1 Carburlzed
Carbunzed steel is most commonly used for highly loaded, compact designs such as aircraft gears, vehkie transmissions of all types, machine tools, industrial gear drives, mining machines and similar uses. This matenal has the highest strength and greatest overload capacity, but carbunzed gears must be carefully manufactured. Carburized gears often result in the least expensive overall transmission design, if their advantage in small size for a given capacy can be utihzed. Few manufacturers can produce carburized gears Larger than 40 inches in diameter, though some can make them over 100 inches in diameter. Secondary finishing operatkns after carbunzing, such as tooth grinding, are often required to achieve the desired tooth form. This is often required to eliminate the distortions caused by heating and cooling employed in the carbunzing process.AGMA 901 pdf download.