AGMA-05FTM17-2005.pdf
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1、05FTM17 Influences of Bearing Life Considerations on Gear Drive Design by: F.C. Uherek, Rexnord Geared Products TECHNICAL PAPER American Gear Manufacturers Association Copyright American Gear Manufacturers Association Provided by IHS under license with AGMA Licensee=IHS Employees/1111111001, User=Wi
2、ng, Bernie Not for Resale, 04/18/2007 11:37:52 MDTNo reproduction or networking permitted without license from IHS -,-,- Influences of Bearing Life Considerations on Gear Drive Design Frank C. Uherek, Rexnord Geared Products The statements and opinions contained herein are those of the author and sh
3、ould not be construed as an official action or opinion of the American Gear Manufacturers Association. Abstract Historically, catalog gear drives have been designed with 5000 hours of L10 bearing life at service factor 1.0 power. Advances in bearing analysis methods have brought new considerations t
4、o the design and selection process. The impact of new modeling techniques, additional considerations, and various extensions to the traditional bearing fatigue calculations are explored. The modeling of these various additions to a traditional catalogL10calculationisillustratedbybearingselectionsfor
5、casesofsingle,double,andtriplereductiongear drives. A roadmap is presented listing critical considerations when applying various bearing manufacturer recommendations. Copyright 2005 American Gear Manufacturers Association 500 Montgomery Street, Suite 350 Alexandria, Virginia, 22314 October, 2005 ISB
6、N: 1-55589-865-3 Copyright American Gear Manufacturers Association Provided by IHS under license with AGMA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 11:37:52 MDTNo reproduction or networking permitted without license from IHS -,-,- 1 Influences of Bearing Life C
7、onsiderations on Gear Drive Design Frank C Uherek, Rexnord Geared Products Introduction Historicallycataloggeardriveshavebeendesigned with 5000 hours of L10 bearing life at service factor 1.0 power. Advances in bearing analysis methods have brought new considerations into the design and selection pr
8、ocess. Reviewing this history using three sample gear drives will illustrate past andcur- rent thinking on this subject and the implications of the various assumptions each of the methods make. Target Design Point By its nature, a catalog design gear drive is not de- veloped with a known set of load
9、 conditions. The designer does not have the luxury of the certain knowledge that it will be operated only at moderate speeds occasionally on Sundays during months that do not have a letter R in them. Catalog speed rangesrunfrom1800to100rpm.Applicationorser- vice factors per AGMA standards range from
10、 1.0 to 2.0forvariousapplications.Customersmayspecify additional requirements such as increased bearing life or limited cooling options that also influence box size. The unit design must be capable of operating at any of these conditions. For the purposes of this paper, we will make the as- sumption
11、 that the gearing is the limiting member in the drive. Bearings, shafting, and other compo- nents, keys, fasteners, etc. will be selected and sized to exceed the rating of the gears. Although optimal,thisgearingonlylimitationissometimesdif- ficult to achieve in practice when one is balancing thecomp
12、etingoptionsofhavingawidevarietyofra- tios and maximum flexibility combined with mini- mum variation in part dimensions and inventory of parts. For this study, we will assume that we can pick the optimum bearing size regardless of size variation across ratios and multiple reduction drives. The gear
13、drive will be operated for 60 Hz service at 1750 rpm input speed. Ambient temperature range is 17 C to + 38 C. Altitude is assumed to be less than 700 meters. The effect ofsump temperatureis reviewedbylooking atboth a28 Crise anda 55C rise in sump temperature above the ambient of 38 C. The control i
14、n temperature rise can take the form of forced air cooling, water cooling coils, or dedicatedpumpandoil-to-water heatexchangers. Gear Drive Designs In1997AGMAwas involvedin aworldwide studyto compare and contrast the various methods used to determine the load distribution factor KH. To fur- ther eff
15、orts in this area, three parallel shaft gear drives were developed to test various assumptions in the calculation models. These gear drives were utilized as the design in the analysis. Thesinglereductiongearunithasaspaceenvelope of 883 mm wide by 635 mm tall by 1021 mm deep shaft-to-shaft with the f
16、ollowing key dimensions listed in table 1. Based on the above geometry, gear ratings were calculated to AGMA 2001-D04 using the AGMA Gear Rating Suite Version 2.2. Setting required gear life to 10000 hours asrecommended inAGMA 6010-F97, and setting service factor equal to unity, we calculate a unit
17、rating of 990 kW at 1750 rpm in- put speed per AGMA 2001-D04. The double reduction unit has a space envelope of 1048 mm wide by 543 mm tall by 870 mm deep shaft-to-shaft with the following key dimensions listed in table 2. Based on the above geometry, gear ratings were calculated to AGMA 2001-D04. S
18、etting required gear life to 10000 hours asrecommended inAGMA 6010, and setting service factor equal to unity, we calculate a unit rating of 308 kW at 1750 rpm input speed per AGMA 2001-D04. The triple reduction unit has a space envelope of 1676 mm wide by 889 mm tall by 1155 mm deep shaft-to-shaft
19、with the following key dimensions listed in table 3. Copyright American Gear Manufacturers Association Provided by IHS under license with AGMA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 11:37:52 MDTNo reproduction or networking permitted without license from IHS
20、-,-,- 2 Table 1. Single Reduction Drive ItemPinionGearBoth/UnitsPinionGearUnits Overall Ratio4.214 Tooth Combination14/59 Normal Module8.00 mm Normal Diametral Pitch3.175 in- -1 Normal Pressure Angle20 deg Helix Angle11 deg Centre Distance304.8 mm Center Distance12.00 in AGMA Quality NumberA6 - Q11
21、Heat treatmentCarburized Manufacturing MethodGround Outside Diameter137.97503.63mm5.43219.828in Operating Pitch Diameter114.10480.82mm4.49218.930in Root Diameter100.20465.81mm3.94518.339in Active Face width127127mm5.005.00in Table 2. Double Reduction Drive ItemPinionGearBoth / UnitsPinionGearUnits O
22、verall Ratio18.264 High Speed Set Tooth Combination15 / 63 Normal Module4.5 mm Normal Diametral Pitch5.644 in- -1 Normal Pressure Angle20 deg Helix Angle11 deg Centre Distance182.88 mm Center Distance7.2 in AGMA Quality NumberA6 - Q11 Heat treatmentCarburized Manufacturing MethodGround Outside Diame
23、ter82.19301.55mm3.23511.872in Operating Pitch Diameter70.33295.42mm2.76911.630in Root Diameter61.30280.43mm2.41311.041in Active Face width76.276.2mm3.003.00in Low Speed Set Tooth Combination17 / 69 Normal Module6.00 mm Normal Diametral Pitch4.233 in- -1 Normal Pressure Angle20 deg Helix Angle9 deg C
24、entre Distance266.7 mm Center Distance10.50 in AGMA Quality NumberA6 - Q11 Heat treatmentCarburized Manufacturing MethodGround Outside Diameter121.03436.35mm4.76517.179in Operating Pitch Diameter105.44427.96mm4.15116.849in Root Diameter93.49408.69mm3.68116.090in Active Face width120.65120.65mm4.754.
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