Converterless multiple-ratio automatic transmission
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United States of America Patent
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-
Apr 17, 2001
Grant Date -
N/A
app pub date -
Jul 15, 1999
filing date -
Jul 15, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multiple-ratio transmission with planetary gearing and a friction clutch and brake for controlling relative motion of the gearing to establish multiple driving ratios between an internal combustion engine and vehicle traction wheels, the clutch and brake include a forward drive clutch and a reverse drive clutch for establishing torque flow paths through the gearing. The forward drive clutch establishes a torque flow path through the gearing from the engine through a torque output element of the transmission during vehicle startup in forward drive range, and the reverse clutch establishes a corresponding torque flow path during startup in reverse. A mechanical connection between the torque input shaft of the gearing and the crankshaft is characterized by minimal rotating mass, thereby reducing the inertia of rotating mass of the elements of the transmission.
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