Efficient eight speed automatic transmission

Details Efficient eight speed automatic transmission Efficient eight speed automatic transmission

2011-01-18

2011-01-18

Lewis, Tisha D (Department: 3655)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

C475S287000, C475S275000, C475S317000, C475S318000, C475S323000, C475S324000

Reexamination Certificate

active

07871351

ABSTRACT:
The present invention provides an eight speed automatic transmission for motor vehicles having three planetary gear sets, four friction clutches, a friction brake, a band brake and an optional overrunning clutch. The eight speed transmission according to the present invention exhibits good gear ratio progression and high efficiency due to its excellent gear mesh efficiency, low spin losses and low pinion speeds.

REFERENCES:
patent: 7074153 (2006-07-01), Usoro et al.
patent: 7108627 (2006-09-01), Bucknor et al.
patent: 7150696 (2006-12-01), Bucknor et al.
patent: 7247120 (2007-07-01), Raghavan et al.
patent: 7250019 (2007-07-01), Bucknor et al.
patent: 7303501 (2007-12-01), Raghavan et al.

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