Seven-speed powertrain of an automatic transmission for...

Details Seven-speed powertrain of an automatic transmission for... Seven-speed powertrain of an automatic transmission for...

2008-05-27

2008-05-27

Wright, Dirk (Department: 3681)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

Reexamination Certificate

active

07377872

ABSTRACT:
Seven forward speeds and three reverse speeds are realized by combining two compound planetary gear sets using three clutches and four brakes, and each shift speed is realized by operating two frictional elements, thereby reducing a capacity of a hydraulic pump and enhancing an efficiency of a hydraulic pressure control by realizing each shift speed by operating two frictional elements. A first shift portion and a second shift portion are disposed on the same shaft axis. The first shift portion includes a first planetary gear set formed as a double pinion planetary gear set and a second planetary gear set formed as a single pinion planetary gear set, and the second shift portion includes a third planetary gear set formed as a single pinion planetary gear set and a fourth planetary gear set formed as a single pinion planetary gear set. The first shift portion is combined by one clutch and two brakes, and the second shift portion is combined by one clutch and two brakes.

REFERENCES:
patent: 7204780 (2007-04-01), Klemen
patent: 2007/0129206 (2007-06-01), Jang
patent: 199 10 299 (2001-04-01), None
patent: 101 62 881 (2003-07-01), None
patent: 10 2004001 376 (2005-08-01), None
patent: 2002-266956 (2002-09-01), None
patent: 2005-083479 (2005-03-01), None

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