A gear-shifting device is disclosed. The device comprises a first motor having a first rotor. The first rotor turns clockwise and counter-clockwise, creating a wobbling action. The device further comprises a compound planetary transmission, comprising a transmission ring attached to a ring gear. The compound planetary transmission receives power from the first rotor. The device further comprises a second motor having a second rotor. The second rotor turns clockwise and counter-clockwise. The device further comprises a shift assembly, comprising a drum, a cap, and a pinion gear. The pinion gear receives power from the second rotor. The drum locks with the pinion gear such that the drum rotates with the pinion gear. The transmission ring is attached to the drum, such that the transmission ring moves laterally as the drum rotates. The ring gear locks and unlocks with the cap as the drum rotates. The wobbling action enables the locking.

Disclosed is a method for operating an interlocking shifting element of a transmission of a vehicle, the interlocking shifting element having shifting element halves which can be moved relative to one another when opening and closing the interlocking shifting element. An electric actuator is arranged to about the relative movement between the shifting element halves when the interlocking shifting element is opened and/or closed. After recognizing a tooth-on-tooth position in the interlocking shifting element, a target torque to be applied at the transmission input is determined as a function of an electric current strength through the electric actuator of the interlocking shifting element, where the target torque is sufficient to resolve the tooth-on-tooth position in the interlocking shifting element.

Disclosed is a method for operating an interlocking shifting element of a transmission of a vehicle, the interlocking shifting element having shifting element halves which can be moved relative to one another when opening and closing the interlocking shifting element. An electric actuator is arranged to about the relative movement between the shifting element halves when the interlocking shifting element is opened and/or closed. After recognizing a tooth-on-tooth position in the interlocking shifting element, a target torque to be applied at the transmission input is determined as a function of an electric current strength through the electric actuator of the interlocking shifting element, where the target torque is sufficient to resolve the tooth-on-tooth position in the interlocking shifting element.

A tandem drive axle mechanical shift assembly including a first shift rail assembly having a first shift rail actuated via a first pneumatic actuator, and a shift fork having a first end coupled with the first shift rail and a second end coupled with an engagement selector. A second shift rail assembly having a second shift rail actuated via a second pneumatic actuator, and a second shift fork having a first end coupled with the second shift rail and a second end coupled with an inter-axle differential lock-up clutch. First and second primary valves in fluid communication with a reservoir, and a secondary valve in fluid communication with the reservoir and in selective fluid communication with the second pneumatic actuator. A first actuation valve operated by the first shift rail and in selective fluid communication with the first and second primary valves, and the first and second pneumatic actuators.

An automatic transmission may include rotation shaft, sliding unit mounted on the rotation shaft and slidable up and down along the rotation shaft, diaphragm spring coupled to the sliding unit and deformed to be oriented toward first or second end of the rotation shaft along the rotation shaft according to position of the sliding unit, shift fork connected to the sliding unit or the diaphragm spring and configured to cause synchronizer to engage with speed change gear according to the position of the sliding unit, sliding-unit position adjuster connected to the sliding unit and adjusting the position of the sliding unit by causing the sliding unit to slide up or down along the rotation shaft, and controller for controlling the sliding-unit position adjuster to adjust elastic force of the diaphragm spring according to the vehicle speed by causing the sliding unit to slide upward or downward along the rotation shaft.

An automatic transmission may include rotation shaft, sliding unit mounted on the rotation shaft and slidable up and down along the rotation shaft, diaphragm spring coupled to the sliding unit and deformed to be oriented toward first or second end of the rotation shaft along the rotation shaft according to position of the sliding unit, shift fork connected to the sliding unit or the diaphragm spring and configured to cause synchronizer to engage with speed change gear according to the position of the sliding unit, sliding-unit position adjuster connected to the sliding unit and adjusting the position of the sliding unit by causing the sliding unit to slide up or down along the rotation shaft, and controller for controlling the sliding-unit position adjuster to adjust elastic force of the diaphragm spring according to the vehicle speed by causing the sliding unit to slide upward or downward along the rotation shaft.

An automatic transmission may include a rotating shaft; a slider portion provided on the rotating shaft; a first connecting member having one end hinged to the rotating shaft and the other end rising or falling by a centrifugal force as the rotating shaft rotates; a second connecting member having one end hinged to the first connecting member and the other end connected to a slider portion to vertically slide the slider as the first connecting member rises or falls; a diaphragm spring coupled to the slider portion and deformed in an axial direction of the rotating shaft depending on position of the slider portion; a shift fork connected to the slider portion or the diaphragm spring and engaging a synchronizer with a shift stage gear depending on position of the slider portion; an elastic regulator controlling an elastic force of the diaphragm spring; and a controller controlling the elastic regulator.

An automatic transmission may include a rotating shaft; a slider portion provided on the rotating shaft; a first connecting member having one end hinged to the rotating shaft and the other end rising or falling by a centrifugal force as the rotating shaft rotates; a second connecting member having one end hinged to the first connecting member and the other end connected to a slider portion to vertically slide the slider as the first connecting member rises or falls; a diaphragm spring coupled to the slider portion and deformed in an axial direction of the rotating shaft depending on position of the slider portion; a shift fork connected to the slider portion or the diaphragm spring and engaging a synchronizer with a shift stage gear depending on position of the slider portion; an elastic regulator controlling an elastic force of the diaphragm spring; and a controller controlling the elastic regulator.

A hand-held power tool which includes a shiftable transmission that is shiftable at least between a first gear and a second gear via a shifting member, in which the shifting member is coupled to a spring element, which for the gear shifting is indirectly or directly actuatable at least via a first and a second shifting element. A coupling element which is coupleable to the spring element is associated with the first shifting element, and the coupling element is configured for allowing gear shifting by actuating the first shifting element only for the case that the second shifting element is in a predefined gear shift position.

A hand-held power tool which includes a shiftable transmission that is shiftable at least between a first gear and a second gear via a shifting member, in which the shifting member is coupled to a spring element, which for the gear shifting is indirectly or directly actuatable at least via a first and a second shifting element. A coupling element which is coupleable to the spring element is associated with the first shifting element, and the coupling element is configured for allowing gear shifting by actuating the first shifting element only for the case that the second shifting element is in a predefined gear shift position.