Eight speed automatic transmission with dual area clutch piston

Details Eight speed automatic transmission with dual area clutch piston Eight speed automatic transmission with dual area clutch piston

2007-09-27

2010-06-15

Estremsky, Sherry L. (Department: 3655)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

C475S288000

Reexamination Certificate

active

07736264

ABSTRACT:
A transmission includes four planetary gearsets and five torque transmitting devices operative to provide eight forward speed ratios. At least one of the torque transmitting devices is engaged during two different speed ratios. The torque transmitting device includes a piston partially defining two separate and independently pressurizable chambers. Accordingly, the transmission enables both chambers to be pressurized for speed ratios in which a high torque capacity is required of the torque transmitting device, and only one of the chambers to be pressurized for speed ratios in which a low torque capacity is required of the torque transmitting device.

REFERENCES:
patent: 4683776 (1987-08-01), Klemen
patent: 4875561 (1989-10-01), Schneider et al.
patent: 7104380 (2006-09-01), Bishop et al.
patent: 2004/0082428 (2004-04-01), Benedict Usoro et al.
patent: 2008/0015080 (2008-01-01), Kamm et al.

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