Zf Friedrichshafen Ag

Zahnradfabrik Friedrichshafen, Ag.

Zf Freidrichshafen Ag

Gert Bauknecht

Peter Ziemer

Gerhard Gumpoltsberger

Stefan Beck

Christian Sibla

Josef Haupt

Armin Gierling

Mark Andy Mohr

Manfred Bucksch

Peter Schiele

Alfred Skrabs

Heribert Scherer

Matthias Reisch

Thilo Schmidt

Ralf Dreibholz

Georg Gierer

Bernhard Sich

Axel Heitmann

Reinhold Mayer

Reinhard Mertinkat

Thomas Lindner

Walter Fritz

Manuel Goetz

Lutz Gärtner

Ulrich Dorr

Ewald Ast

Rainer Pfalz

A transmission device has at least one electro-hydraulic transmission control unit and a method of operating the transmission device having a plurality of gear wheel that can be engaged and disengaged from a force flow by fluidically actuated shifting elements. A piston space of a first shifting element, delimited by a second functional surface of the actuating piston of the first shifting element, is made separate from a piston space of a second shifting element, delimited by the first functional surface of the actuating piston, and an area of the second shifting element, that carries an actuating pressure, or an area of the first shifting element, that carries an actuating pressure, is, or can be, connected to the piston space delimited by the second functional surface of the actuating piston of the first shifting element.

Transmission device and method for operating a transmission device

A power-shiftable transmission, in particular an automatic transmission for a vehicle, which comprises a plurality of frictional shifting elements and at least one interlocking shifting element (A, B, C, D, E) and a plurality of gearwheels which can be engaged in a power flow by the shifting elements (A, B, C, D, E). In order to engage a gear step, at least two associated shifting elements (A, B, C, D, E) are engaged and at least one interlocking shifting element (B), as a shifting element (B) to be engaged, is associated with a gear step to be engaged with a supporting gear.

Power-shiftable transmission

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 multi-ratio transmission with forward and reverse gears, gearsets (P, P, P, P), shafts and shifting elements. A sun gear of the gearset (P) directly couples an input shaft, which couples, via clutch (), shaft () and, via clutch (), shaft (). Shaft () couples the carrier of gearset (P) and the ring gear of gearset (P) and couples, via brake (), a housing. Shaft () couples the sun gear of gearset (P) and, via clutch (), shaft (), which couples the sun gears of gearsets (P, P). Shaft () couples the carrier of gearset (P) and the ring gear of gearset (P) and, via brake (), the housing. Shaft () couples the ring gear of gearset (P) and, via brake (), the housing. Shaft () couples the carrier of gearset (P) and the ring gear of gearset (P). The output shaft couples the carrier of gearset (P).

Multi-ratio transmission

A transmission comprising four gear sets (P, P, P, P), eight shafts and six shift elements. The drive shaft is connected with sun gear of set (P) and carrier of set (P). Carrier of set (P) is connected to shaft () which is connectable to a housing, via a first brake, and connectable to shaft (), via clutch (). Shaft () interconnects the ring gear of set (P) with the sun gears of sets (P, P). Shaft () interconnects ring gear of set (P) with carrier of set (P). Shaft () couples sun gear of set (P) to the housing, via a brake. Ring gear of set (P) is connected to the housing. The output shaft is connectable, via clutch (), with shaft () which is connected to ring gear of set (P) and, via clutch (), with shaft () which is connected to carrier of set (P).

A multi step transmission comprising planetary gearsets (P, P, P, P), shafts and shift elements. The sun gear of gearset (P) couples drive shaft (). The carrier of set (P) couples shaft (), which couples housing (G) via brake (), shaft () via clutch () and shaft () via clutch (). Shaft () couples the ring and sun gear of gearsets (PP) respectively, and, via clutch (), shaft (), which couples the carrier of gearset (P). Shaft () couples the carrier of gearset (P). Shaft () couples the ring gear of gearset (P) and the carrier of set (P). The sun gear of gearset (P) couples shaft (), which couples housing (G) via brake (). The ring gear of gearset (P) couples shaft (), which couples housing (G) via brake (). Output shaft () couples the carrier of gearset (P) and the ring gear of gearset (P).

A multi step transmission comprising four planetary gear sets, shafts, and shift elements, the sun gear of gearset (P) couples shaft () which couples housing (G) via brake (), the carrier of gearset (P) couples shaft () which couples housing (G) via brake (), and drive shaft () via clutch (), and shaft () via clutch (). Shaft () couples the ring gear of gearset (P) and is operatively connected to the sun gear of gearset (P). Shaft () couples the sun gear of gearset (P) and the carrier of gearset (P). Shaft () couples the ring gear of gearset (P), the carrier of gearset (P), and the sun gear of gearset (P). The ring gear of gearset (P) couples housing (G). Output shaft () detachably couples shaft (), which couples the ring gear of gearset (P), via clutch (), and operatively couples the carrier of gearset (P).

A lubrication device for a planetary transmission with a plurality of planetary gearsets in which a ring gear carrier, which supports a ring gear of a first planetary gearset, is connected to a planetary gear carrier which supports a plurality of planetary gears of an adjacent, second planetary gearset, and in which a lubricant supply for the planetary gears of the second planetary gearset is provided. To provide an inexpensive, simply designed and reliable lubricant supply to the planetary gears of the web carrier coupled to the ring gear of the other planetary gearset, the ring gear is sealed relative to the ring gear carrier of the first planetary gearset and relative to the planetary gear carrier of the second planetary gearset.

Lubrication device for a planetary gear

A multi-ratio transmission comprising four planetary gearsets, eight rotary shafts and six shifting elements including first, second, third and fourth clutches and first and second brakes. The shafts either directly couple or selectively couple, via the shifting elements, the gearsets to each other or a housing of the transmission so as to implement nine forward gears and one reverse gear.

A multi step transmission comprises planetary gearsets (P, P, P, P), shafts and shift elements. The sun gear of gearset (P) couples housing (G). The carrier of gearset (P) couples shaft (), which couples housing (G) via brake (), drive shaft () via clutch (), and shaft () via clutch (). Shaft () operatively couples the sun gear of gearset (P) and couples the ring gear of gearset (P) and the sun gear of set (P). Shaft () couples, via clutch (), shaft (), which couples the sun gear of gearset (P), and operatively couples the carrier of gearset (P). Shaft () couples the ring gear of gearset (P) and the carrier of gearset (P) The ring gear of gearset (P) couples shaft (), which couples housing (G) via brake (), and output shaft () couples the ring gear of gearset (P) and the carrier of set (P).

A transmission comprising four planetary gear sets, eight shafts and six shift elements. The sun gear of gear set (P) is fixed via brake (), the carrier of gear set (P) is fixed via brake () and the drive via clutch (), and shaft () via clutch (). Sixth shaft () is connected to the ring gear of gear set (P) and the sun gear of gear set (P), the drive is connected to the sun gear of gear set (P) and is connectable to the carrier of gear set (P). Seventh shaft () is connected to the ring gear of gear set (P) and the carrier of gear set (P), and is connectable to the sun gear of gear set (P). The ring gear of the fourth gear set (P) is connectable to the housing via brake (). The output is connected to the ring gear of third gear set (P) and the carrier of fourth gear set (P).

A multi step transmission comprising planetary gearsets (P, P, P, P), shafts and shift elements. The sun gear of gearset (P) couples shaft () which couples housing (G) via brake (). The carrier of gearset (P) couples shaft (), which couples housing (G) via brake (), drive shaft () via clutch (), and shaft () via clutch (). Shaft () couples the ring gear of gearset (P) and the sun gear of set (P), and, via clutch (), shaft (), which couples the sun gear of gearset (P). Shaft () couples the sun gear of gearset (P) and the carrier of set (P). Shaft () couples the ring gear of set (P) and the carrier of gearset (P). The ring gear of set (P) couples shaft () which couples housing (G) via brake (). Output shaft () couples the ring gear and carrier of gearsets (P, P) respectively.

A multi-stage transmission comprising planetary gearsets (P, P, P, P), shafts and shift elements. The sun gear of gearset (P) couples drive shaft (). The carrier of gearset (P) couples shaft () which can couple housing (G) via brake (), shaft () via clutch (), which couples the carrier of gearset (P), and shaft (), via clutch (). Shaft () couples the ring gear of gearset (P) and the sun gears of gearsets (P, P). Shaft () couples the ring gear of gearset (P) and the carrier of gearset (P). The sun gear of set (P) couples shaft (), which can couple housing (G) via brake (). The ring gear of gearset (P) couples shaft (), which can couple housing (G) via brake () and output shaft () operatively couples the ring gear of gearset (P), is connected to the carrier of gearset (P).

A multi-stage transmission comprising planetary gearsets (P, P, P, P), shafts, and shift elements. Gearsets (P, P) form a front -mounted gear gearset and gearsets (P, P) form a main gearset. The carriers of gearsets (P, P) are coupled via shaft () which couples a main gearset element. The ring gear of gearset (P) couples the sun gear of gearset (P) via shaft () that couples drive shaft () via clutch (). The sun gear of gearset (P) couples housing (G) by shaft () via brake (), and shaft () via clutch (). The ring gear of gearset (P) couples housing (G) by shaft () via brake (). Shaft () couples main gearset element, and, via brake (), housing (G). Shaft () couples another main gearset element and, via clutch (), shaft (). The output shaft couples a further main gearset element.

Multi-stage gearbox

A multi speed transmission comprising planetary gearsets (P, P, P, P), shafts and shift elements. The sun gear of gearset (P) couples shaft () which can couple housing (G) via brake () and the carrier of set (P) couples shaft () which can couple housing (G), via brake (), and drive shaft () via clutch (), and shaft () via clutch (). Shaft () couples the ring gear of gearset (P) and the sun gears of gearsets (P, P). Shaft () couples the sun gear of gearset (P) and is operatively connected to the carrier of gearset (P). Shaft () couples the ring gear of set (P) and the carrier of gearset (P). The ring gear of gearset (P) couples shaft () which can couple housing (G) via brake () and output shaft () operatively couples the carrier of gearset (P) and the ring gear of gearset (P).

Growing community of inventors

Friedrichshafen, Germany

Gert Bauknecht