An Overview of Current Automatic, Manual and Continuously Variable Transmission Efficiencies and Their Projected Future Improvements 1999-01-1259
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.
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, https://doi.org/10.4271/1999-01-1259. Download Citation
Michael A. Kluger, Denis M. Long
Southwest Research Institute
International Congress & Exposition
Car Technology Yearbook 2000-CTY2000, Electronic Transmission Controls-PT-79, SAE 1999 Transactions - Journal of Commercial Vehicles-V108-2