Abstract: A multi step transmission, of a planetary design, which has an external housing and includes a transmission input shaft and a transmission output shaft. First, second, third and fourth planetary gear sets are each accommodated within the transmission housing along with third, fourth, fifth, sixth, seventh and eighth shafts, and at least six shift elements. The at least six shift elements comprises first and second brakes and first, second, third and fourth clutches, whose selected engagement produces different transmission ratios between the drive shaft and the output shaft such that nine separate forward gears and one reverse gear can be achieved. For each of the forward and reverse gears, only three of the six shift elements are engaged.

Abstract: A multi-stage transmission comprising planetary gear sets (P1, P2, P3, P4), shafts, and shift elements. The sun gear of gearset (P1) couples housing (G), the carrier of gearset (P1) couples shaft (3) which couples housing (G), via brake (03), and shaft (1) via clutch (13) and shaft (5) via clutch (35). Shaft (5) couples the ring gear of gearset (P2) and the sun gears of gearsets (P3, P4). Shaft (1) couples the sun gear of gearset (P2) and the carrier of gearset (P3). Shaft (6) couples the carrier of gearset (P2) and the ring gear of gearset (P1), the ring gear of set (P4) couples shaft (4) which couples housing (G) via brake (04), and output shaft (2) couples the carrier of gearset (P4) and shaft (7), which couples, via clutch (27), the ring gear of gearset (P3).

Abstract: A multi step transmission comprising gear sets, shafts and shift elements. The sun gear of set (P1) couples drive shaft (1). The carrier of set (P1) couples shaft (3) which couples, via brake (03), housing (G). Shaft (3) couples shaft (1), via clutch (13), and shaft (5) via clutch (35). Shaft (5) couples the ring and sun gears of sets (P2, P4) respectively, and shaft (8), which couples the sun gear of set (P3), via clutch (58). Shaft (1) couples shaft (7) which couples, via clutch (17), the carrier of set (P4). Shaft (6) couples the ring gear of set (P1) and the carrier of set (P2). The sun gear of set (P2) couples shaft (4) which couples, via brake (04), housing (G). The ring gear of set (P3) couples housing (G). Output shaft (2) couples the ring gear and carrier of sets (P4, P3) respectively.

Abstract: 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.

Abstract: A multi-stage transmission comprising planetary gearsets (P1, P2, P3, P4), shafts and shift elements. The sun gear of gearset (P1) couples drive shaft (1). The carrier of gearset (P1) couples shaft (3) which can couple housing (G) via brake (03),shaft (1) via clutch (13), which couples the carrier of gearset (P4), and shaft (6), via clutch (36). Shaft (6) couples the ring gear of gearset (P2) and the sun gears of gearsets (P3, P4). Shaft (7) couples the ring gear of gearset (P1) and the carrier of gearset (P2). The sun gear of set (P2) couples shaft (4), which can couple housing (G) via brake (04). The ring gear of gearset (P3) couples shaft (5), which can couple housing (G) via brake (05) and output shaft (2) operatively couples the ring gear of gearset (P4), is connected to the carrier of gearset (P3).

Abstract: A multi step transmission, of a planetary design, which has an external housing and includes a transmission input shaft and a transmission output shaft. First, second, third and fourth planetary gear sets are each accommodated within the transmission housing along with third, fourth, fifth, sixth, seventh and eighth shafts, and at least six shift elements. The at least six shift elements comprises first and second brakes and first, second, third and fourth clutches, whose selected engagement produces different transmission ratios between the drive shaft and the output shaft such that nine separate forward gears and one reverse gear can be achieved. For each of the forward and reverse gears, only three of the six shift elements are engaged.

Abstract: A multi-step transmission including four gear sets, shafts, and shifting elements. The sun gear of gearset (P4) couples shaft (3) which communicates, via brake (03), with the housing. The carrier of gearset (P4) couples the output shaft, which couples the ring gear of gearset (P2). The ring gear of gearset (P4) couples shaft (7), which couples the carrier of gearset (P2) and, via clutch (17), communicates with the drive shaft, which communicates, via clutch (18), with the ring gear of gearset (P1) coupled to shaft (8), and, via clutch (15), communicates with shaft (5). Shaft (5) couples the sun gear of gearset (P3), and, via brake (05), communicates with the housing. The carrier of gearset (P1) couples the shaft (6), the ring gear of gearset (P3) and the sun gear of gearset (P2). The carrier of gearset (P3) couples the shaft (4), which, via brake (4), communicates with the housing.

Abstract: A multi-stage transmission comprises planetary gearsets (P1, P2, P3, P4), shafts and shift elements. The carriers of gearsets (P1, P2) couple via shaft (4) which couples the sun gear of gearset (P3). The ring gear of the gearset (P1) couples the sun gear of gearset (P2) via shaft (8), which couples drive shaft (1) via clutch (18). The sun gear of gearset (P1) couples housing (G) by shaft (3) via brake (03), and shaft (1) via clutch (13). The ring gear of gearset (P2) couples housing (G) by shaft (5) via brake (05). The sun gear of gearset (P4) couples housing (G). Shaft (6) couples shaft (1) via clutch (16) and carrier of gearset (P3). Shaft (9) couples shaft (4) via clutch (49) and the ring gear of gearset (P4). Output shaft (2) couples the ring gear and the carrier respectively of gearsets (P3, P4).

Abstract: A multi-speed transmission having four gearsets, eight shafts and six shifting elements. The sun gear of gearset (P2) couples, via shaft (5) and brake (05), the housing (G), and, via clutch (15) the drive shaft. The carriers of gearsets (P2, P3) communicate, via shaft (4) and brake (04), with housing (G), and the sun gear of gearset (P3) communicates, via shaft (8) and clutch (18), with the drive shaft. The ring gears of gearsets (P2, P3) communicate, via shaft (6), with the ring gear of gearset (P4) and the sun gear of gearset (P1). The ring gear of gearset (P4) and the sun gear of gearset (P1) are connected with one another. The sun gear of gearset (P4) communicates, via shaft (3) and brake (03), with housing (G). The carriers of gearsets (P1, P4) communicate, via shaft (7) and clutch (17), with the drive shaft and the output shaft couples the ring gear of gearset (P1).

Abstract: An arrangement for planetary gearsets comprises at least simple radially inner and radially outer planetary gearsets each comprising a sun gear, a ring gear and a carrier that carries planetary gears. The two gearsets are coaxially aligned and one of the gearsets is radially nested inside the sun gear of the other gearset. The ring gear of the radially inner gearset and the sun gear of the radially outer planetary gearset are at least coupled to one another in a rotationally fixed and are connected to a common carrier by driving teeth. To achieve a simple and inexpensive production, the ring gear of the radially inner gearset and the sun gear of the radially outer gearset are first produced as separate components with different heat treatments and then the ring and the sun gear are connected together by one of a friction force locking, a form interlocking and/or positive bonding.

Abstract: A transmission comprising four planetary gear sets, eight shafts and six shift elements. The sun gear of gear set (P1) is fixed via brake (04), the carrier of gear set (P1) is fixed via brake (03) and the drive via clutch (13), and shaft (6) via clutch (36). Sixth shaft (6) is connected to the ring gear of gear set (P2) and the sun gear of gear set (P4), the drive is connected to the sun gear of gear set (P2) and is connectable to the carrier of gear set (P3). Seventh shaft (7) is connected to the ring gear of gear set (P1) and the carrier of gear set (P2), and is connectable to the sun gear of gear set (P3). The ring gear of the fourth gear set (P4) is connectable to the housing via brake (05). The output is connected to the ring gear of third gear set (P3) and the carrier of fourth gear set (P4).

Abstract: 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.

Abstract: The multi-ratio transmission with forward and reverse gears, gearsets (P1, P2, P3, P4), shafts and shifting elements. A sun gear of the gearset (P1) directly couples an input shaft, which couples, via clutch (14), shaft (4) and, via clutch (17), shaft (7). Shaft (4) couples the carrier of gearset (P2) and the ring gear of gearset (P3) and couples, via brake (04), a housing. Shaft (7) couples the sun gear of gearset (P4) and, via clutch (78), shaft (8), which couples the sun gears of gearsets (P3, P2). Shaft (3) couples the carrier of gearset (P1) and the ring gear of gearset (P2) and, via brake (03), the housing. Shaft (5) couples the ring gear of gearset (P1) and, via brake (05), the housing. Shaft (6) couples the carrier of gearset (P3) and the ring gear of gearset (P4). The output shaft couples the carrier of gearset (P4).

Abstract: A multi-stage transmission with nine forward gears and one reverse gear comprising four planetary gear sets, eight rotatable shafts and six shift elements. The sun gear of the first set is connected to fourth shaft which is couplable to a housing by the first brake, the carrier of the first set is connected to the third shaft, which is coupled to the housing by the second brake, which is detachably connectable to the drive shaft, via the first clutch, and via a second clutch is detachably connectable to the seventh shaft. The seventh shaft is connected to the ring gear of the second set and with the sun of the fourth set, and the drive shaft is connected to the sun of the second set and to the carrier of the third set. The sixth shaft is connected to the ring gear of the first set, the carrier of the second set and the sun gear of the third set. The ring gear of the fourth set is connected to the fifth shaft which can be coupled to the housing via the third brake.

Abstract: A multi step transmission comprises planetary gearsets (P1, P2, P3, P4), shafts and shift elements. The sun gear of gearset (P1) couples housing (G). The carrier of gearset (P1) couples shaft (3), which couples housing (G) via brake (03), drive shaft (01) via clutch (13), and shaft (5) via clutch (35). Shaft (5) operatively couples the sun gear of gearset (P3) and couples the ring gear of gearset (P2) and the sun gear of set (P4). Shaft (1) couples, via clutch (17), shaft (7), which couples the sun gear of gearset (P2), and operatively couples the carrier of gearset (P3). Shaft (6) couples the ring gear of gearset (P1) and the carrier of gearset (P2) The ring gear of gearset (P4) couples shaft (4), which couples housing (G) via brake (04), and output shaft (2) couples the ring gear of gearset (P3) and the carrier of set (P4).

Abstract: A multi step transmission comprising planetary gearsets (P1, P2, P3, P4), shafts and shift elements. The sun gear of gearset (P1) couples drive shaft (1). The carrier of set (P1) couples shaft (3), which couples housing (G) via brake (03), shaft (1) via clutch (13) and shaft (6) via clutch (36). Shaft (6) couples the ring and sun gear of gearsets (P2 P3) respectively, and, via clutch (68), shaft (8), which couples the carrier of gearset (P4). Shaft (1) couples the carrier of gearset (P4). Shaft (7) couples the ring gear of gearset (P1) and the carrier of set (P2). The sun gear of gearset (P4) couples shaft (4), which couples housing (G) via brake (04). The ring gear of gearset (P3) couples shaft (5), which couples housing (G) via brake (05). Output shaft (2) couples the carrier of gearset (P3) and the ring gear of gearset (P4).

Abstract: A multi step transmission comprising planetary gearsets (P1, P2, P3, P4), shafts and shift elements. The sun gear of gearset (P1) couples shaft (4) which couples housing (G) via brake (04). The carrier of gearset (P1) couples shaft (3), which couples housing (G) via brake (03), drive shaft (1) via clutch (13), and shaft (6) via clutch (36). Shaft (6) couples the ring gear of gearset (P2) and the sun gear of set (P4), and, via clutch (68), shaft (8), which couples the sun gear of gearset (P3). Shaft (1) couples the sun gear of gearset (P2) and the carrier of set (P3). Shaft (7) couples the ring gear of set (P1) and the carrier of gearset (P2). The ring gear of set (P4) couples shaft (5) which couples housing (G) via brake (05). Output shaft (2) couples the ring gear and carrier of gearsets (P3, P4) respectively.

Abstract: A multi speed transmission comprising planetary gearsets (P1, P2, P3, P4), shafts and shift elements. The sun gear of gearset (P1) couples shaft (4) which can couple housing (G) via brake (04) and the carrier of set (P1) couples shaft (3) which can couple housing (G), via brake (03), and drive shaft (1) via clutch (13), and shaft (6) via clutch (36). Shaft (6) couples the ring gear of gearset (P2) and the sun gears of gearsets (P3, P4). Shaft (1) couples the sun gear of gearset (P2) and is operatively connected to the carrier of gearset (P3). Shaft (7) couples the ring gear of set (P1) and the carrier of gearset (P2). The ring gear of gearset (P4) couples shaft (5) which can couple housing (G) via brake (05) and output shaft (2) operatively couples the carrier of gearset (P4) and the ring gear of gearset (P3).

Abstract: A multi step transmission comprising four planetary gear sets, shafts, and shift elements, the sun gear of gearset (P1) couples shaft (4) which couples housing (G) via brake (04), the carrier of gearset (P1) couples shaft (3) which couples housing (G) via brake (03), and drive shaft (1) via clutch (13), and shaft (6) via clutch (36). Shaft (6) couples the ring gear of gearset (P2) and is operatively connected to the sun gear of gearset (P4). Shaft (1) couples the sun gear of gearset (P2) and the carrier of gearset (P3). Shaft (5) couples the ring gear of gearset (P1), the carrier of gearset (P2), and the sun gear of gearset (P3). The ring gear of gearset (P4) couples housing (G). Output shaft (2) detachably couples shaft (7), which couples the ring gear of gearset (P3), via clutch (27), and operatively couples the carrier of gearset (P4).

Abstract: A transmission comprising gear sets (P1, P2, P3, P4), eight shafts and six shift elements. Sun gear of set (P1) couples the drive shaft, the carrier of set (P1) is connected to shaft (3) which couples a housing, via a first brake, and couples the drive shaft and shaft (5) respectively via clutches. Shaft (5) couples the ring gear of set (P2), the sun gears of sets (P3, P4), and the drive shaft couples the carrier of set (P4). Shaft (6) couples the ring gear of set (P1) and the carrier of set (P2). Sun gear of set (P2) is connected to shaft (4) which couples a housing, via a brake. Ring gear of set (P3) couples the housing, the output shaft couples, via a clutch, shaft (7) which couples the ring gear of set (P4), and, via another clutch, shaft (8) which couples the carrier of set (P3).