Zf Friedrichshafen Ag

Rudolf Kauffeldt

Johannes Kaltenbach

Michael Wechs

Ralf Dreibholz

Thomas Rosemeier

Juergen Wafzig

Markus Renninger

Gerhard Gumpoltsberger

Wolfgang Rieger

Michael Ebenhoch

Hans-Joachim Martin

Michael Drabek

Stefan Csajagi

A dual clutch transmission designed as a reduction gearing which has concentric central and hollow transmission shafts, exactly one layshaft, and two power shift elements. A hollow shaft is provided coaxially on the layshaft, which can be rotatably fixed to the layshaft, via one shift device, and to which at least two gears of the gear stages are rotatably fixed. A further hollow shaft is provided coaxially on either the central or the hollow transmission shaft, which can be connected, via one of the shift devices, with the central or the hollow transmission shaft and to which at least two further gears of the gear stages are rotatably fixed. At least three transmission ratios are obtainable as a result of engaging the shift element into the power flow in three of the gear stages, by which one transmission ratio results from engaging only one shift element into the power flow.

Dual clutch transmission designed as reduction gearing

A double clutch transmission of countershaft design having a central shaft and a concentric hollow transmission shaft, one countershaft, and two power-shift elements. Two hollow shafts are disposed on the countershaft coaxially to the countershaft, each of which can be fixed, via one shift device, to the countershaft, and to which at least two gearwheels are fixed. A further hollow shaft is coaxially provided on either the central or hollow transmission shafts and can be connected, via a shift device, to the central or hollow transmission shaft, and to which at least two further gearwheels of the gear stages are fixed. At least three transmission ratios are possible by engaging three of the gear stages on the shift-element side into the power flow, thereby enabling one transmission ratio to be at least partially implemented by a respective sole engagement on the shift-element side into the power flow.

Double clutch transmission having a layshaft design

A shifting device () for shifting a motor vehicle transmission with a shift selector shaft on which a plurality of shift elements () such as shift forks or shift rockers () are arranged and can be displaced to carry out a shifting operation. The shifting device () includes one hydraulic shift cylinder (), that can be actuated from both sides, with a piston () that can be displaced within a cylinder housing () and which is actively connected with a shift element () to be actuated. To simplify a shifting device () of this type, the piston () has a piston rod () that follows the movement of the piston () and can be connected directly to the shift element () in a detachable manner.

Shifting device for shifting a motor vehicle gear box

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Bodolz, Germany

Rudolf Kauffeldt