Abstract: A shift element (1) for an automatic transmission of a motor vehicle includes a first (2) and a second shift-element half (3). Each shift-element half includes a disk carrier (4, 5) and multiple essentially annular disks (11-14, 51-54). Multiple disks (11, 12) of the disk carrier (4) of at least one shift-element half (2) are designed in such a way that the disks have a defined imbalance. The disks (11, 12) having the defined imbalance are arranged or rotated relative to each other, with consideration for the size of the particular imbalance, in such a way that, in sum, the imbalances of the disks (11, 12) at least approximately cancel each other out and therefore, overall, this shift-element half (2) has no imbalance or at least a clearly reduced imbalance.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A shifting device (1) for shifting a motor vehicle transmission with a shift selector shaft on which a plurality of shift elements (2) such as shift forks or shift rockers (3) are arranged and can be displaced to carry out a shifting operation. The shifting device (1) includes one hydraulic shift cylinder (5, 11, 18, 25), that can be actuated from both sides, with a piston (9, 15, 16, 19, 26) that can be displaced within a cylinder housing (6) and which is actively connected with a shift element (2) to be actuated. To simplify a shifting device (1) of this type, the piston (9, 15, 16, 19, 26) has a piston rod (10, 17, 23, 29) that follows the movement of the piston (9, 15, 16, 19, 26) and can be connected directly to the shift element (2) in a detachable manner.

Abstract: A pressure supply between a variator shaft and a pressure chamber (6) for the axial displacement of the mobile disc of a pair of conic pulleys of a continuously adjustable automatic transmission, which includes a longitudinal borehole (7) and radial boreholes (8, 9) in a variator shaft (1), as well as a radial borehole (10) in the locating disc. For each pressure chamber (6) there are at least two piercing radial boreholes made in the variator shaft, which are axially shifted from each other and rotated approximately 90° between themselves. The oil can run over the longitudinal borehole of the variator shaft and over the radial boreholes through the radial borehole in a locating disc of a pressure chamber (6), in such a way that the oil flow is always ensured regardless of the axial position or of the tangential location of the locating disc regarding the variator shaft.

Abstract: A reversing gearset of a continuously variable transmission, in particular a continuously variable belt transmission has a drive input shaft (6), a primary shaft (10), a simple planetary gearset with a sun gear (2), a web (3) for the planetary gears (4) and an annular gear (5) and two shift elements (7, 8) for shifting to the forward or the reverse directions. The transmission ratio of the reversing gearset (1), in the reverse direction, is greater than one (i.e., it is a speed-drop ratio), such that in the forward direction, the transmission ratio of the reversing gearset (1) is equal to one.

Abstract: A shifting device (1) for shifting a motor vehicle transmission with a shift selector shaft on which a plurality of shift elements (2) such as shift forks or shift rockers (3) are arranged and can be displaced to carry out a shifting operation. The shifting device (1) includes one hydraulic shift cylinder (5, 11, 18, 25), that can be actuated from both sides, with a piston (9, 15, 16, 19, 26) that can be displaced within a cylinder housing (6) and which is actively connected with a shift element (2) to be actuated. To simplify a shifting device (1) of this type, the piston (9, 15, 16, 19, 26) has a piston rod (10, 17, 23, 29) that follows the movement of the piston (9, 15, 16, 19, 26) and can be connected directly to the shift element (2) in a detachable manner.

Abstract: A reversing gearset of a continuously variable transmission, in particular a continuously variable belt transmission has a drive input shaft (6), a primary shaft (10), a simple planetary gearset with a sun gear (2), a web (3) for the planetary gears (4) and an annular gear (5) and two shift elements (7, 8) for shifting to the forward or the reverse directions. The transmission ratio of the reversing gearset (1), in the reverse direction, is greater than one (i.e., it is a speed-drop ratio), such that in the forward direction, the transmission ratio of the reversing gearset (1) is equal to one.

Abstract: A pressure supply between a variator shaft and a pressure chamber (6) for the axial displacement of the mobile disc of a pair of conic pulleys of a continuously adjustable automatic transmission, which includes a longitudinal borehole (7) and radial boreholes (8, 9) in a variator shaft (1), as well as a radial borehole (10) in the locating disc. For each pressure chamber (6) there are at least two piercing radial boreholes made in the variator shaft, which are axially shifted from each other and rotated approximately 90° between themselves. The oil can run over the longitudinal borehole of the variator shaft and over the radial boreholes through the radial borehole in a locating disc of a pressure chamber (6), in such a way that the oil flow is always ensured regardless of the axial position or of the tangential location of the locating disc regarding the variator shaft.

Abstract: A variator for ratio adjustment of a continuously variable chain drive transmission having one variator shaft (1) and one variator pulley (2) supported upon the variator shaft (1) and axially movable by pressurizing a variator pressure chamber (31). The variator shaft (1) has on one end an axial hole (10) through which the variator pressure chamber (31) and a second pressure chamber (8) can be loaded with pressure independent of each other. The pressure is supplied to the variator pressure chamber (31) via a first section (13) of the axial hole (10) and the pressure is supplied to the second pressure chamber (8) via a non-rotating pipe (7) and a second section (15) of the axial hole (10), the pipe (7) is situated within the first hole section (13).

Abstract: A variator for ratio adjustment of a continuously variable chain drive transmission having one variator shaft (1) and one variator pulley (2) supported upon the variator shaft (1) and axially movable by pressurizing a variator pressure chamber (31). The variator shaft (1) has on one end an axial hole (10) through which the variator pressure chamber (31) and a second pressure chamber (8) can be loaded with pressure independent of each other. The pressure is supplied to the variator pressure chamber (31) via a first section (13) of the axial hole (10) and the pressure is supplied to the second pressure chamber (8) via a non-rotating pipe (7) and a second section (15) of the axial hole (10), the pipe (7) is situated within the first hole section (13).