W/D NO S/S
Introduction
Military vehicle transmissions have a very high power to ratioand carry more loads within the given volume and space than thetransmission used for commercial applications. The gears used haveincreased load carrying capacity, less noise and vibrations. Thegears used are generally profilemodified to suit the high loadcarrying requirement of the vehicle. One such gear pair used forincreasing the load carrying capacity of the gear is the highcontact ratio (HCR) gear pair. The HCR gears having a contact ratiogreater than 2.0 have load sharing between two or three teethduring engagement and lowermagnitude loads per tooth [1] ascompared to normal contact ratio (NCR) gear. The HCR gearsguarantees that a minimum of two teeth always share the load[2,3,4]. The wearmechanisms between gears are often described aseithermild wear, surface fatigue or scuffing and are relatedaccording to Figure 1.
Wear can alter not only stress and load distributions but alsothe noise and vibration levels of a gear set thus justifyingin–depth studies in both static and dynamic conditions. The loadsharing during path of contact for gears could be estimated usingthe FiniteElementMethod (FEM). The wear rate comparison of theHCRgear and NCR gear having identical module and fixed centerdistance could be extrapolated based on the above. However, thereis no reference or publication on this topic as on today. Thispaper predicts the wear rate for the HCR gear and NCR gear foridentical load conditions by taking in to consideration the loadsharing ratio and the contact pressures estimated using the finiteelement method (FEM) and using the Archard wear equation [5].
- Edition:
- 11
- Published:
- 10/01/2011
- Number of Pages:
- 12
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