An Overview of Current Automatic, Manual and Continuously Variable Transmission Efficiencies and Their Projected Future Improvements
Date Published: 1999-03-01
Paper Number:1999-01-1259
DOI: 10.4271/1999-01-1259
Citation:
Kluger, M. and Long, D., "An Overview of Current Automatic, Manual and Continuously Variable Transmission Efficiencies and Their Projected Future Improvements," SAE Technical Paper 1999-01-1259, 1999, doi:10.4271/1999-01-1259.
Author(s):
Michael A. Kluger - Southwest Research Institute
Denis M. Long - Southwest Research Institute
Abstract:
This paper will overview current production manual, automatic, and continuously variable transmission (CVT) efficiencies and efficiency variations across the industry. For automatic transmissions, efficiencies associated with the pump and the gearbox components will be highlighted along with areas for improvements. Efficiencies associated with various types of pumps such as internal-external, gerotor, hypocycloidal, and variable displacement will be compared. For CVT's a comparison of efficiencies for belt type and toroidal types will be provided, along with an examination of external-external and variable displacement type ball pumps.
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