ΜΕΤΩΠΙΚΟΙ ΟΔΟΝΤΩΤΟΙ 

ΤΡΟΧΟΙ

2

ANSI/AGMA 2001‐D04 Fundamental Rating Factors and Calculation Methods for Involute Spur and Helical Gear Teeth (reaffirmed March 2016)AGMA 246.02A, Recommended Procedure for Carburized Aerospace Gearing.AGMA 908‐B89, Information Sheet ‐ Geometry Factors for Determining the Pitting Resistance and Bending Strengthfor Spur, Helical and Herringbone Gear Teeth.AMS 2300G, Steel Cleanliness, Premium Aircraft‐ Quality, Magnetic Particle Inspection Procedure.AMS 2301G, Steel Cleanliness, Aircraft‐Quality Magnetic Particle Inspection Procedure.ANSI/AGMA 1012‐F90, Gear Nomenclature, Definitions of Terms with Symbols.ANSI/AGMA 2004‐B89, Gear Materials and Heat Treatment Manual.ANSI/AGMA 2007‐B92, Surface Temper Etch Inspection After Grinding.ANSI/AGMA 2015‐1‐A01, Accuracy Classification System ‐ Tangential Measurements for Cylindrical Gears.ANSI/AGMA 6000‐A88, Specification for Measurement of Lateral Vibration on Gear Units.ANSI/AGMA 6033‐A88, Standard for Marine Propulsion Gear Units, Part 1, Materials.ANSI/AGMA 9005‐D94, Industrial Gear Lubrication.ASTM A48‐93a, Specification for Gray Iron Castings.ASTM A388‐91, Practice for Ultrasonic Examination of Heavy Steel Forgings.ASTM A534‐90, Specification for Carburizing Steels for Anti‐friction Bearings.ASTM A535‐85(1992), Specification for Special Quality Ball and Roller Bearing Steel.ASTM A536‐84 (1993), Specification for Ductile Iron Castings.ASTM A609‐91, Practice for Castings, Carbon, Low Alloy, and Martensitic Stainless Steel, Ultrasonic ExaminationThereof.ASTM A866‐92, Specification for Medium Carbon Anti‐friction Bearing Steel.ASTM B148‐93, Specification for Aluminum ‐ Bronze Sand Castings.ASTM E112‐88, Test Methods for Determining Average Grain Size.ASTM E428‐92, Practice for Fabrication and Control of Steel Reference Blocks Used in Ultrasonic Inspection.ASTM E709‐91, Guide for Magnetic Particle Examination.

http://members.agma.org/MyAGMA/Store/AGMA_Store_Standards.aspx#/anchor

3

Although suitable for initial selection of a gear, the Lewis equation is inadequatefor detailed design calculations when the life of the machine is critical or whenthe gears are highly loaded. National and international standards are availabledetailing the calculation of bending and contact stresses for gears. This chapteroutlines the American Gear Manufacturers Association standards for thecalculation of bending and contact stresses for spur and helical gears

Based on safe working practices, the AGMA has defined allowable stressequations for gears for the allowable bending stress and for the allowablecontact stress.

4

5

6

7

Ko: overload factor

Kv: dynamic effects factor

8

Ks: size factor

ή 0.05351.192( )sK mb Y

9

Km: load distribution factor

10

Kb: rim thickness factor

11

12

Sat: allowable bending stress

13

Sat: allowable bending stress

14

Sat: allowable bending stress

15

Sat: allowable bending stress

16

Sat: allowable bending stress

17

Sat: allowable bending stress

18

Sat: allowable bending stress

19

20

KL= Yn stress cycle factor

21

KL= Yn stress cycle factor

22

KL= Yn stress cycle factor

23

KT= temperature factor

KR= reliability factor Juvinall‐Mashek

24

KR= reliability factor

25

26

27

I: geometry factor (spur gears)

Cp: elastic coefficient

28

Cp: elastic coefficient

29

Sac: allowable contact stress

30

Sac: allowable contact stress

31

Sac: allowable contact stress

32

Sac: allowable contact stress

33

Zn: stress cycle factor

34

Zn: stress cycle factor

35

CH: hardness ratio factor