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Qaagi - Book of Why

Causes

Effects

improper load share between two ( or more ) pairs of the gear teethresultingin gear - tooth failure

• Insufficient strength ( either bending strength or contact strengthcausesfailure of the gear teeth

a high stress enmeshed condition between the worm gear portion of the armature shaft and the driven worm gear teeththereby causinggear tooth breakage

Continued overloadmay resultin gear tooth failures

friction , lubrication , and wear , and especially those failure(passive) influenced bygear tooth failures

because clearance must be provided between the gear tooth meshes or they may overheat and bind in operationcausingpremature gear tooth failure

These fragments ... a premature failurecould causea catastrophic gear - tooth failure

a Severe Service Gear Oilwould ... resultin gear tooth failure

tooth whitening arcledgear tooth

Slewing Ring with Gear Hardness Gradient&colonto preventgear tooth

in the crankshaft gear eating away several teethresultedin the crankshaft gear eating away several teeth

in reduced gearbox liferesultsin reduced gearbox life

Gear failures(passive) are often caused byGear failures

a clicking soundwill causea clicking sound

the vibration(passive) was caused bythe vibration

from a loss of lubricantresultingfrom a loss of lubricant

the shutter mechanism to jam open brieflycausesthe shutter mechanism to jam open briefly

the increased vibrations(passive) caused bythe increased vibrations

accentsdesignedaccents

to changes in amplitude and phase in the stiffness of the gear mesh [ 22 , 23will leadto changes in amplitude and phase in the stiffness of the gear mesh [ 22 , 23

to total system failuredoes leadto total system failure

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