Machine element or mechanism – Gearing – Plural power paths to and/or from gearing
Patent
1975-06-25
1977-07-19
Schwadron, Martin P.
Machine element or mechanism
Gearing
Plural power paths to and/or from gearing
74688, F16H 304, F16H 4708, F16H 5710
Patent
active
040360814
ABSTRACT:
An overdrive mechanism is provided for use in an automatic transmission of the type including a torque converter and a change gear mechanism. The torque converter has a pump impeller obtaining its input from an engine and a turbine runner whose output is applied to a shaft of the change gear mechanism.
The overdrive mechanism is disposed between the torque converter and the change gear mechanism and is responsive to the operation of the change gear mechanism. The overdrive mechanism includes a planetary gear train having a sun gear fixed stationary, a carrier operatively responsive to the pump impeller of the torque converter, and a ring gear operatively connected to the sun gear and carrier so that it at all times has output power of a rotational speed greater than that of the engine. An overdrive clutch is provided that connects the shaft of the change gear mechanism to the pump impeller of the torque converter through the ring gear and planetary gear train to thereby by-pass the turbine runner of the torque converter.
This device provides for fuel efficiency by eliminating fluid turbulence in the torque converter during this overdrive condition.
REFERENCES:
patent: 3354746 (1967-11-01), Paredes
patent: 3463033 (1969-08-01), Fisher
patent: 3473411 (1969-10-01), Paredes
patent: 3491617 (1970-01-01), Konrad
patent: 3584520 (1971-06-01), Borman
patent: 3597999 (1971-08-01), Fisher
patent: 3665787 (1972-05-01), Wilkinson
patent: 3772939 (1973-11-01), Hause
patent: 3884095 (1975-05-01), Miyao
Nagano Syuji
Onuma Kiyoshi
Hershkovitz Abraham
Schwadron Martin P.
Toyota Jidosha Kogyo Kabushiki Kaisha
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