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Dynamic Characteristics of Speed Ratio Control of the Halt Toroidal CVT for Passenger Cars
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English
Abstract
This paper describes the results of an investigation into the controllability of a traction-drive type half toroidal CVT, built with traction-drive elements. One feature of this CVT is that it provides better power transmission efficiency at its rolling contact points than other traction-drive CVTs developed previously. Another feature is that ratio changes can be effected with only a slight power input. A third feature is that it does not require any special hydraulic system to engage the contact points of rolling elements because it is designed to generate engaging force spontaneously in proportion to the torque input.
The first half of the paper presents an analysis of the shifting mechanism. The characteristics of ratio changes effected by slight displacements of the power rollers were analyzed theoretically. A simplified CVT model was then examined experimentally and found to provide good response characteristics.
The second half of the paper deals with an experiment carried out with a CVT-equipped car. The aim of this experiment was to confirm whether the same quick response could be obtained with an actual vehicle as with the simplified model. Measurements made of the downshifting response during sudden braking showed that fast enough response was obtained to ensure sufficient reliability.
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Citation
Nakano, M. and Hibi, T., "Dynamic Characteristics of Speed Ratio Control of the Halt Toroidal CVT for Passenger Cars," SAE Technical Paper 901761, 1990, https://doi.org/10.4271/901761.Also In
Dynamic Characteristics of TodayS Passenger Car Transmissions
Number: SP-0837; Published: 1990-09-01
Number: SP-0837; Published: 1990-09-01
References
- Tanaka H. “Power Transmission of a Cone Roller Toroidal Traction Drive (1st Report, Speed and Torque Transmission Efficiencies)” Trans. JSME 53 July 1987 1501
- Kraus J.H. Kraus C.E. Gres M.E. “A Continuously Variable Transmission for Automotive Fuel Economy” SAE 751180 1987
- Machida H. “A Consideration on Characteristics of Traction Drive” Monthly Journal of Institute of Industrial Science (SEISAN KENKYU) University of Tokyo 33 8 Aug. 1981 351 359
- Tanaka H. “Power Transmission of a Cone Roller Toroidal Traction Drive (1st Report, Speed and Torque Transmission Efficiencies) Trans. JSME 53 491 July 1987 1500 1506
- Tanaka H. “Power Transmission of a Cone Roller Toroidal Traction Drive (2nd Report, Side Slip and Speed Ratio Change) Trans. JSME 54 509 July 1988 1577 1583
- Kraus J.H. Kraus C.E. Gres M.E “A Continuously Variable Transmission for Automotive Fuel Economy” SAE 751180 1987