Zf Friedrichshafen Ag

Heribert Scherer

Peter Ziemer

Gert Bauknecht

Manfred Bucksch

Lutz Gärtner

A motor vehicle multi-stage planetary transmission which has a housing that accommodates four planetary gear sets (P, P, P, P), shafts (-), three clutches (K, K, K) and three brakes (B, B, B) whose selective actuation implements various transmission ratios between drive and output shafts. The carriers of gear sets (P, P) are connected by shaft (), the ring gear of gear set (P) can be fixed to the housing, via shaft (), by actuating brake (B). A ring gear of gear set (P) and a sun gear of gear set (P) are coupled by shaft () which can be connected, via clutch (K), to the drive shaft. A sun gear of gear set (P) can be fixed, via brake (B), to the housing and can be coupled, by clutch (K), to drive shaft. The first and second clutches (K, K) are startup elements which initiate startup procedures.

Planetary gear type multi-stage transmission

The invention concerns an automatic gearbox, with a drive input shaft () which is connected to a shiftable reduction planetary gear set (), with a drive output shaft () which is connected to a shiftable main planetary gear set (), and with five shifting elements (A to E) by the selective closing of which six forward speeds can be engaged without range change. An output element of the reduction planetary gear set () can be connected via a first shifting element (A) to a first input element of the main planetary gear set () and via a second shifting element (B) to a second input element of the main planetary gear set (). The drive input shaft () can be connected via a fifth shifting element (E) to a third input element of the main planetary gear set (). A solar gear wheel () of the reduction planetary gear set () is in particular fixed on a cylindrical projection () of a gearbox housing wall (). The reduction planetary gear set () is made as a Plus transmission with inner and outer planetary gear wheels (), whose webs () are connected to one another.

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Meckenbeuren, Germany

Heribert Scherer