Multiple gear stage automatic transmission

US7137923B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Peter Tiesler · Meckenbeuren, DE
• Gerhard Gumpoltsberger · Friedrichshafen, DE

Key dates

• Filing date: Aug 31, 2004
• Grant date: Nov 21, 2006
• Expiry date: Oct 24, 2024

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2200/2097
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

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) produce, 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 seven or eight forward gears and one reverse gear.