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A Fundamental Consideration on Shift Mechanism of Automatic Transmission
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English
Abstract
A new shift mechanism for automatic transmissions was designed by considering a compact design and a better shift quality, which used exclusively plate clutches as the engaging elements of the planetary reaction members. The new shift mechanism is useful for three- or four-speed automatic transmissions. In this design, a shift control method for the new mechanism and the effect of the vibration system of vehicle on the shift quality were investigated both theoretically and experimentally.
As results of the study, it was clarified that the new shift mechanism shows a better shift quality, and that the shift characteristics are remarkably affected by the vibration system of vehicle, especially the torsional vibration of rear axles, the axle wind-up and the fore-and-aft vibration of engine.
The new shift mechanism has been successfully applied to a Toyota four-speed automatic transmission with overdrive.
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Citation
Shindo, Y., Ito, H., and Ishihara, T., "A Fundamental Consideration on Shift Mechanism of Automatic Transmission," SAE Technical Paper 790043, 1979, https://doi.org/10.4271/790043.Also In
References
- Ishihara T. Emori R. I. “Torque Converter as a Vibrator Damper and Its Transient Characteristics” SAE Transactions 75 1967 660368
- Ishihara T. Oya M. Nishikawa H. Suzuki K. “Transient characteristics of Automatic Transmission during Gear Ratio change” 12th FISITA Congress 1 13 May 1968
- Ishihara T. Inui S. “Testing Method for Automatic Transmission during Gear change” 13th FISITA Congress 1970
- Winchell F. J. Route W. D. “Ratio Changing the Passenger Car Automatic Transmission” Paper 311A SAE Automotive Engineering Congress Detroit Jan. 1961
- Anderson R. L. Bierley R. L. “Measuring Automatic Transmission Shift Performance” SAE Transactions 74 1966 650456
- Numazawa A. Kubo S. Shindo Y. Moroto S. “TOYOTA Four-Speed Automatic Transmission with Overdrive” Paper 780097 SAE Automotive Engineering Congress Detroit Feb. 1978
- Jones P. G. “Torsional Vibrations in Drive Lines” Paper 650291 SAE Automotive Engineering Congress Peoria April 1965