Multi step transmission

US8241171B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Gerhard Gumpoltsberger · Friedrichshafen, DE
• Christian Sibla · Friedrichshafen, DE
• Stefan Beck · Eriskirch, DE
• Josef Haupt · Tettnang, DE
• Gert Bauknecht · Friedrichshafen, DE
• Peter Ziemer · Tettnang, DE

Key dates

• Filing date: Aug 19, 2010
• Grant date: Aug 14, 2012
• Expiry date: Oct 10, 2030

Classification

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

Abstract

A multi step transmission comprising a drive shaft, an output shaft, four planetary gear sets each having a sun gear, a carrier and a ring gear, third, four, fifth, six, seventh and eighth rotatable shafts and at least six shift elements for selectively engaging different transmission ratios between the drive shaft and the output shaft such that nine forward gears and one reverse gear can be implemented. For each one of the nine forward gears and one reverse gear only three of the at least six shift elements are engaged. The sixth shaft is operatively connectable to the sun gear of the third platentary gear set via either a direct connection or a releasable connection.