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Vehicle Transmission Inertia Test Protocol
Technical Paper
2011-01-1276
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A high accuracy and low cost test protocol for the determination
of the inertial characteristics of a high performance vehicle
transmission is discussed. In particular, a range of NASCAR Sprint
Cup race car transmission gear packages are tested and compared.
The test results compare the inertial characteristics from the new
CR2C transmission as developed by C&R Racing to the current
standard four-speed manual version. The test protocol evaluates the
inertial properties by suspending the input, output, and secondary
shafts from a light weight hollow Ø1/4" x 16.58' long
(Ø6.35 mm x 5.05 m) vertical torsion spring tube. An initial offset
twist results in rotational cycling of the components at an easily
measurable natural oscillatory period. The equations are developed
for the application of the natural frequency measurements to the
component inertia results. To provide an easily understood
comparison, a full race car power train acceleration analysis is
then done to assess the inertial differences in terms of gained
"effective" horsepower.
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Authors
Citation
Buskirk, B. and Tkacik, P., "Vehicle Transmission Inertia Test Protocol," SAE Technical Paper 2011-01-1276, 2011, https://doi.org/10.4271/2011-01-1276.Also In
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