Patent Number: 7,131,926

Title: Multiple gear stage automatic transmission

Abstract: A multiple gear transmission having a drive shaft (1) and a driven shaft (2), three planetary gear sets (P1, P2, P3), seven rotatable shafts (1, 2, 3, 4, 5, 6, 7) and seven shifting elements (03, 04, 05, 06, 14, 37, 57) comprising four brakes (03, 04, 05, 06) and three clutches (14, 37, 57). Selective engagement of the seven shifting elements (03, 04, 05, 06, 14, 37, 57) produces, from the drive supplied by the drive shaft (1) via the three planetary gear sets (P1, P2, P3), the seven rotatable shafts (1, 2, 3, 4, 5, 6, 7) and the driven shaft (2), different reduction ratios for eight or nine forward gears and one reverse gear.

Inventors: Tiesler; Peter (Meckenbeuren, DE), Gumpoltsberger; Gerhard (Friedrichshafen, DE)

Assignee: ZF Friedrichshafen AG

International Classification: F16H 3/44 (20060101)

Expiration Date: 2019-11-07 0:00:00