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A Fresh Perspective on Hypoid Gearset Duty-Cycle Severity
Technical Paper
2021-01-0707
ISSN: 0148-7191, e-ISSN: 2688-3627
Sector:
Event:
SAE WCX Digital Summit
Language:
English
Abstract
A new method is demonstrated for rating the “severity” of a hypoid gear set duty-cycle (revolutions at torque) using the intercept of T-N curve to support gearset selection and sizing decision across vehicle programs. Historically, it has been customary to compute a cumulative damage (using Miner's Rule) for a rotating component duty-cycle given a TN curve slope and intercept for the component and failure mode of interest. The slope and intercept of a T-N curve is often proprietary to the axle manufacturer and are not published. Therefore, for upfront sizing and selection purposes representative T-N properties are used to assess relative component duty cycle severity via cumulative damage (non-dimensional quantity). A similar duty-cycle “severity” rating can also be achieved by computing the intercept of the T-N curve instead of cumulative damage, which is the focus of this method. In this case, the TN intercept for a given vehicle duty-cycle provides a duty-cycle severity rating for that vehicle program and this rating can be generated for duty-cycles across all programs to provide a convenient means to match a duty-cycle with a hypoid gear set size.