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AGMA 10FTM15

Original price was: $86.00.Current price is: $43.00.

It is a common practice in high power gear design to applyrelieves to tooth flanks. They are meant to prevent stressconcentration near the tooth edges. Gears with crownings have pointcontact without load. When load is applied, instantaneous contactturns from point into a Hertzian contact ellipse. The contact areagrows and changes location as load increases. To prevent edgecontact, gear designer has to choose suitable relieves consideringcontact indentations as well as relative displacements of gearmembers. In the majority of spiral bevel gears spherical crowningsare used. The contact pattern is set to the center of active toothflank and the extent of crownings is determined by experience.Feedback from service, as well as from full torque bench tests ofcomplete gear drives have shown that this conventional designpractice leads to loaded contact patterns, which are rarely optimalin location and extent. Too large relieves lead to small contactarea and increased stresses and noise; whereas too small relievesresult in a too sensitive tooth contact. Today it is possible touse calculative methods to predict the relative displacements ofgears under operating load and conditions. Displacements anddeformations originating from shafts, bearings and housing areconsidered. Shafts are modeled based on beam theory. Bearings aremodeled as 5-DOF supports with non-linear stiffness in alldirections. Housing deformations are determined by FEM-analysis andtaken into account as translations and rotations of bearing outerrings. The effect of temperature differences, bearing preload andclearances are also incorporated. With the help of loaded toothcontact analysis (LTCA), it is possible to compensate for thesedisplacements and determine a special initial contact position thatwill lead to well centered full torque contact utilizing areasonably large portion of the available tooth flank area. At thesame time, crownings can be scaled to the minimum necessary amount.This systematic approach leads to minimum tooth stressing, lowernoise excitation as well as increased reliability and/or powerdensity as compared to conventional contact design method. Duringrecent years ATA Gears Ltd. has gained comprehensive know-how andexperience in such analyses and advanced contact patternoptimization. The methodology and calculation models have beenverified in numerous customer projects and case studies.

Edition:
10
Published:
10/01/2010
Number of Pages:
14
File Size:
1 file , 830 KB

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AGMA 10FTM15
Original price was: $86.00.Current price is: $43.00.