A piston-cylinder assembly (1) has a cylindrical housing (3), with a main piston (2) and at least one trailing piston (11, 12). The trailing piston (11, 12) is axially guided on a cylindrical outer lateral face (38) of the main piston (2). The trailing piston (11, 12) has a thrust portion (13, 14) at one end near a piston web on the main piston, The thrust portion extends axially inward toward the piston web (10) A travel limiter (28) on the cylindrical housing limits a travel range of the trailing piston (11, 12) Under pressure, the trailing piston (11, 12) follows the main piston (2) until the trailing piston (11, 12) hits the travel limiter (28). The thrust portion (13, 14) of the trailing piston (11, 12) is shaped to fit into an associated recess (30, 31) in the piston web with a positive lock.

A transmission includes an input shaft coupled to a prime mover, a countershaft, main shaft, and an output shaft, with gears between the countershaft and the main shaft. A shift actuator selectively couples the input shaft to the main shaft by rotatably coupling gears between the countershaft and the main shaft. The shift actuator is mounted on an exterior wall of a housing including the countershaft and the main shaft. A controller controls the shift actuator utilizing an actuating pulse and an opposing pulse.

An acceleration method for a hybrid drivetrain includes providing the hybrid drivetrain, setting an initial torque transmission ratio of a belt-drive transmission to a lower transmission ratio, and opening a first disconnect clutch to interrupt torque transmission between an internal combustion engine and an electric machine. The method also includes receiving an acceleration command, shifting the torque transmission ratio with a transmission adjustment gradient from the lower transmission ratio towards an upper transmission ratio, increasing a rotor speed of a rotor shaft of the electric machine with a rotor shaft adjustment gradient, and engaging a first disconnect clutch to rotate an ICE shaft to start the internal combustion engine and increase a rotational speed of the ICE shaft towards a current rotor speed.

An acceleration method for a hybrid drivetrain includes providing the hybrid drivetrain, setting an initial torque transmission ratio of a belt-drive transmission to a lower transmission ratio, and opening a first disconnect clutch to interrupt torque transmission between an internal combustion engine and an electric machine. The method also includes receiving an acceleration command, shifting the torque transmission ratio with a transmission adjustment gradient from the lower transmission ratio towards an upper transmission ratio, increasing a rotor speed of a rotor shaft of the electric machine with a rotor shaft adjustment gradient, and engaging a first disconnect clutch to rotate an ICE shaft to start the internal combustion engine and increase a rotational speed of the ICE shaft towards a current rotor speed.

An actuating device (10) for an automated manual transmission (12) includes a pressure-medium-operated actuator (54) having a piston (58) and a piston rod (64) connectable to the selector element or shift element of the manual transmission. The piston is arranged in a cylindrical receiving chamber (50) of the housing (18) of the actuator and is coaxially movable therein. A sensor system (30)includes a magnet (38) arranged on a holding device (44) and a magnetic-field-sensitive sensor (32) is arranged on the housing radially with respect to the magnet (44).The holding device has a hollow cylindrical geometry, an anti-rotation element (80)is form-lockingly accommodated in an associated recess in the housing (18), and that the anti-rotation element extends across the holding device in the manner of a secant such that rotational movement of the holding device is blocked, although axial and rotational movement of the piston are possible.

An actuating device (10) for an automated manual transmission (12) includes a pressure-medium-operated actuator (54) having a piston (58) and a piston rod (64) connectable to the selector element or shift element of the manual transmission. The piston is arranged in a cylindrical receiving chamber (50) of the housing (18) of the actuator and is coaxially movable therein. A sensor system (30)includes a magnet (38) arranged on a holding device (44) and a magnetic-field-sensitive sensor (32) is arranged on the housing radially with respect to the magnet (44).The holding device has a hollow cylindrical geometry, an anti-rotation element (80)is form-lockingly accommodated in an associated recess in the housing (18), and that the anti-rotation element extends across the holding device in the manner of a secant such that rotational movement of the holding device is blocked, although axial and rotational movement of the piston are possible.

An actuator unit for a shiftable transmission, in particular a transmission of an electrically driven utility vehicle, has an actuating element which is designed to adjust at least two shift positions in the transmission. The actuator unit is designed to be provided as a separate unit at least partially within the transmission. A transmission having such an actuator unit is disclosed.

An actuator unit for a shiftable transmission, in particular a transmission of an electrically driven utility vehicle, has an actuating element which is designed to adjust at least two shift positions in the transmission. The actuator unit is designed to be provided as a separate unit at least partially within the transmission. A transmission having such an actuator unit is disclosed.

A transmission includes an input shaft coupled to a prime mover, a countershaft, main shaft, and an output shaft, with gears between the countershaft and the main shaft. The shift actuator is mounted on an exterior wall of a housing including the countershaft and the main shaft. A shift control circuit operates a shift actuator using a first opposing pulse command and a first actuating pulse command, and releases pressure with shift actuating and opposing volumes of the shift actuator upon determining a shift completion event.

An improved twin clutch, two-speed disconnect secondary drive unit, which may be configured as a rear drive unit (RDU) for an all wheel drive vehicle is provided. The RDU is driven through an input shaft, which is connected to a vehicle drive source such as a motor, and includes a twin clutch assembly, which is connected to the drive shaft and is selectively actuated to drive left and right main shafts, which drive respective wheels of the vehicle. The RDU further includes a modular a shift assembly mountable to one or both of said main shafts to drive output shafts, wherein each shift assembly is selectively operable between the hi-range and lo-range modes to shift driving operation of the output shafts between hi-speed and lo-speed operation. The shift assembly may be controlled by improved mono-stable or bi-stable actuators.