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Toyota New Four-Speed Automatic Transmission for Front Wheel Drive Vehicles
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English
Abstract
The design requirement for more efficient vehicle moves a compact car toward front wheel drive arrangement, which requires an entire redesign of its power train. Toyota, with systematic approach from its planning stage, has developed a new automatic transmission series including one 3-speed and two 4-speed transmissions. An extensive examination on gear train arrangements enabled the 3-speed light, compact and highly reliable under the arrangement of Simpson gear train, and freewheel shifts with one-way clutches at every shifting. Two different 4th gear packages with freewheel shift are combined with the 3-speed unit to provide the versatility for the 4-speed units in various installations. Besides, these transmissions feature lock-up clutch converter, oil pump of a new tooth profile and two different control systems: hydraulic and electro-hydraulic.
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Citation
Kuramochi, K., Shindo, K., Kubo, S., and Miura, M., "Toyota New Four-Speed Automatic Transmission for Front Wheel Drive Vehicles," SAE Technical Paper 840049, 1984, https://doi.org/10.4271/840049.Also In
References
- Numazawa A. Kubo S. Shindo Y. Moroto S. “Toyota Four-Speed Automatic Transmission with Overdrive” Paper 780097 presented at SAE Automotive Engineering Congress Detroit February 1978
- Taga Y. Nakamura K. Ito H. “Toyota Computer Controlled Four-Speed Automatic Transmission” Paper 820740 presented at SAE Passenger Car Meeting Troy June 1982
- Numazawa, A. Ushijima, F. Fukumura K. Ishihara T. “An Experimental Analysis of Fluid Flow in a Torque Converter” Paper 830571 presented at SAE International Congress Detroit February 1983
- Shindo, Y. Ito H. Ishihara T. “A Fundamental Consideration on Shift Mechanism of Automatic Transmission” Paper 790043 presented at SAE Automotive Engineering Congress Detroit 1979