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PPT版3thetoothsurfaceinenginetimingchainsprocketsisan
outstandingexampleofthislatteradvantage.Inthiscase,
timingchainlifeisextendedbecausenylondampens
somewhatthetransmissionofshockloadsfromfuelignition.
ZYTEL®nylonresinandDELRIN®acetalresinhave
lowcoefficientsoffrictionandgoodwearcharacteristics,
offeringtheabilitytooperatewithlittleornolubrication.
Theycanalsooperateinenvironmentsthatwouldbe
adversetometalgears.Asummaryoftheadvantagesand
limitationsofplasticgearsisgiveninTable8.01.
Knowledgeofthematerialperformancecharacteristics
anduseofthegeardesigninformationtofollowisimportant
tosuccessfulgearapplicationsinDELRIN®acetal
resinandZYTEL®nylonresin.
etc.
–Matinggearmaterialincludingsurfacefinishandhardness.
–Typeoflubrication(frictionalheat).
Selectionoftheproperstresslevelcanbestbemadebased
onexperiencewithsuccessfulgearapplicationsofasimilar
nature.Fig.8.01plotsanumberofsuccessfulgear
applicationsofDELRIN®acetalresinandZYTEL®nylon
resinintermsofperipheralspeedandtoothbendingstress.
Notethatalloftheseapplicationsareinroomtemperature,
indoorenvironments.Forsimilarapplicationsoperating
athighertemperatures,theallowablestressshouldbe
corrected,seefactorC1inTable8.02.Sincefatigue
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