Selector drum for an automated manual transmission, in particular a dual clutch transmission, having a selector drum body, which can be mounted in the manual transmission for rotation about an axis of rotation, wherein at least one shifting contour is formed on the selector drum body, said shifting contour extending over a peripheral portion of the selector drum body, wherein the selector drum is designed for shifting at least one high gear stage, one middle gear stage and one low gear stage, wherein the at least one shifting contour has a shifting contour switch in a region of a switch gear portion.

Methods and systems are provided for adapting a pressure to torque transfer function of a clutch of a dual clutch transmission. In one example, a method includes operating a first clutch of the dual clutch transmission at a selected capacity to change a speed of a first transmission input shaft to a desired speed, adjusting values of a torque transfer function of the first clutch based on a rate of the speed change, and maintaining driver demanded wheel torque during the adjusting via controlling torque output of an electric motor positioned in the driveline. In this way, the method may be used to adapt both positive and negative torque transfer functions.

A power unit for a vehicle includes an engine that is a power source, a gear shift apparatus, a twin clutch type transmission that intermittently switches power transmission between the engine and the gear shift apparatus, and a clutch actuator that controls intermittent switching of the twin clutch type transmission, the engine includes a crankcase and a pair of cylinders installed on the crankcase so that a V-bank is formed therebetween, and the clutch actuator is installed on the cylinders so that the clutch actuator overlaps a region of the V-bank.

A clutch arrangement arranged between a drive unit and a transmission, with at least one multi-plate clutch having an outer plate carrier and an actuation element. The actuation element, particularly a piston, has openings for receiving the outer plate carrier.

A hydraulic control system may include control valve to selectively supply line pressure to first and second ejection flow channels, first shift valve converting flow channel, second shift valve converting path to selectively supply hydraulic pressure of the first ejection path to first chambers of first and second actuators and to selectively supply hydraulic pressure of the second ejection path to second chambers of the first and second actuators, third shift valve converting path to selectively supply hydraulic pressure of the first ejection path to first chamber of third actuator and to selectively supply hydraulic pressure of the second ejection path to second chamber of third actuator, and fourth shift valve converting path to selectively supply hydraulic pressure of the first ejection path to first chambers of fourth and fifth actuators and to selectively supply hydraulic pressure of the second ejection path to second chambers of fourth and fifth actuators.

A shift gearbox may include at least two driven piston-cylinder units, which are each driven via a transmission of a drive, and the piston-cylinder units may each comprise a piston, which delimits a working chamber, and each working chamber is in hydraulic connection with at least one clutch actuator and at least one gear selector via a hydraulic main line, whereby the clutch actuator comprises a working chamber delimited by a piston. A valve may be respectively arranged between each working chamber of a clutch actuator and a hydraulic main line, and both the pressure build-up and the pressure reduction in the clutch actuators may occur by adjusting the piston of a piston-cylinder unit.

A shift gearbox, a control unit, and at least one electric motor-driven driven piston-cylinder unit with a piston, which delimits at least one working chamber, which is connected via hydraulic lines to multiple shift gearbox units of the shift gearbox and shifts these, wherein the shift gearbox units comprise at least one gear selector unit and at least one clutch units, characterised in that the control unit for shifting at least one of the shift gearbox units rotates the electric motor drive by a predetermined angle and the piston of the piston-cylinder unit is adjusted by a predetermined path (s) (path control) and the piston thereby conveys a required hydraulic volume to or from at least one shift gearbox unit.

Disclosed herein is gear actuator for dual clutch transmission, including: a driving motor having a driving shaft formed with gear part, a pair of first and second gears gear-coupled to the gear part, first and second guide cams respectively connected to the first and second gears to rotate, a first power transfer unit transferring or cutting off the power from the driving motor to the first guide cam according to rotating direction of the first gear, a second power transfer unit transferring or cutting off the power from the driving motor to the second guide cam according to rotating direction of the second gear, a first finger shaft linearly moved by rotation of the first guide cam and performing a selection operation of an odd-numbered stage, and a second finger shaft linearly moved by rotation of the second guide cam and performing a selection operation of an even-numbered stage.

A shift gearbox, a control unit and at least one electric-motor-driven piston-cylinder unit which has a piston and is connected via hydraulic lines to multiple shift gearbox units of the shift gearbox and shifts them, the shift gearbox units comprising at least two clutch units, characterised in that the piston of the piston-cylinder unit is in the form of a dual-action reciprocating piston, wherein the dual-action reciprocating piston sealingly separates two working chambers from each other, wherein each working chamber is connected via a main hydraulic line to one clutch each, and at least one working chamber of the dual-action reciprocating piston can be connected hydraulically via a switch valve to the reservoir.

A hydraulic control system may include control valve to selectively supply line pressure to first and second ejection flow channels, first shift valve converting flow channel, second shift valve converting path to selectively supply hydraulic pressure of the first ejection path to first chambers of first and second actuators and to selectively supply hydraulic pressure of the second ejection path to second chambers of the first and second actuators, third shift valve converting path to selectively supply hydraulic pressure of the first ejection path to first chamber of third actuator and to selectively supply hydraulic pressure of the second ejection path to second chamber of third actuator, and fourth shift valve converting path to selectively supply hydraulic pressure of the first ejection path to first chambers of fourth and fifth actuators and to selectively supply hydraulic pressure of the second ejection path to second chambers of fourth and fifth actuators.