Machine element or mechanism – Gearing – Plural power paths to and/or from gearing
Patent
1975-06-18
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
040360822
ABSTRACT:
An overdrive device 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 device is disposed between the torque converter and the change gear mechanism and is responsive to the operation of the change gear mechanism. The device includes a planetary gear train, an overdrive brake, and a one-way clutch.
During overdrive, when the speed of the shaft of the change gear mechanism exceeds that of the turbine runner, the overdrive brake is actuated to connect the shaft of the change gear mechanism through the planetary gear train to the pump impeller of the torque converter. The device bypasses the turbine runner of the torque converter by a one-way clutch decoupling the shaft of the change gear mechanism. This overdrive 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
Hershkovitz Abraham
Schwadron Martin P.
Toyota Jidosha Kogyo Kabushiki Kaisha
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