Transmission device having a variator

US8287414B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Tobias Weber · Verl, DE
• Gerhard Bailly · Friedrichshafen, DE
• Thomas Ratzmann · Meckenbeuren, DE
• Walter Fischer · Herrenberg, DE
• Jurgen Pohlenz · Ravensburg, DE

Key dates

• Filing date: Aug 15, 2008
• Grant date: Oct 16, 2012
• Expiry date: May 15, 2029

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2200/2005
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A continuously variable transmission device comprising a variator and a secondary power splitting. For power splitting, a planetary gear set has a first shaft coupled to the transmission input, a second shaft of the gear set coupled a first shaft of the variator, and a third shaft of the gear set couples a second shaft of the variator. First and second shift elements are provided to switch between first and second gear ratio ranges. Via the variator, the gear ratio is continuously variable within the gear ratio range and the two gear ratio ranges overlap. To implement the first gear ratio range, the second shaft of the gear set is connected, via the first shift element, to the transmission output, and to implement the second gear ratio range, the third shaft of the planetary gear set is connected, via the second shift element, to the transmission output.