Automatic transmission

Details Automatic transmission Automatic transmission

2011-03-29

2011-03-29

Le, David D (Department: 4156)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Carrier braked

C475S275000, C475S284000

Reexamination Certificate

active

07914415

ABSTRACT:
An automatic transmission is provided with three planetary gear units and five friction elements. The first planetary gear unit includes a first sun gear that is always fixed, a first carrier supporting a first pinion in meshed engagement with the first sun gear and a first ring gear in meshed engagement with the first pinion. The first to fifth friction elements are operatively arranged with respect to the first, second and third planetary gear units to selectively establish at least seven forward speeds and one reverse speed by combining simultaneous engagement of two out of five friction elements for transmitting torque from the input shaft to the output shaft.

REFERENCES:
patent: 6572507 (2003-06-01), Korkmaz et al.
patent: 6648791 (2003-11-01), Kao et al.
patent: 6709358 (2004-03-01), Raghavan et al.
patent: 6743146 (2004-06-01), Usoro et al.
patent: 7294088 (2007-11-01), Shim et al.
patent: 2008/0103014 (2008-05-01), Gumpoltsberger
patent: 2010/0048343 (2010-02-01), Boss et al.
patent: 2004-176765 (2004-06-01), None

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