A gear shifting control method for an electric vehicle includes an operation range determination step of determining, by a controller, whether a current revolutions per minute (RPM) of a motor falls within a constant torque range or a constant power range when gear shifting is initiated between a first shift gear and a second shift gear. A variable control step controls an operating power of a cone clutch by adjusting an operating tilt if it is determined that the RPM of the motor falls within the constant torque range in the operation range determination step. A constant control step controls the operating power of the cone clutch to be constant if it is determined that the RPM of the motor falls within the constant power range in the operation range determination step.

An electromagnetic clutch assembly may include a first clutch plate, a second clutch plate, and a synchronizer. The second clutch plate may define an aperture. A portion of the synchronizer may be configured to extend through the aperture. In the absence of a magnetic field, the first clutch plate and the first surface of the second clutch plate may define an air gap and the portion of the synchronizer may extend into the air gap. In response to a first magnetic field, the portion of the synchronizer may contact the first clutch plate. In response to a second magnetic field, the portion of the synchronizer may translate in the aperture toward the second clutch plate and the first clutch plate and the second clutch plate may close the air gap.

An electromagnetic clutch assembly may include a first clutch plate, a second clutch plate, and a synchronizer. The second clutch plate may define an aperture. A portion of the synchronizer may be configured to extend through the aperture. In the absence of a magnetic field, the first clutch plate and the first surface of the second clutch plate may define an air gap and the portion of the synchronizer may extend into the air gap. In response to a first magnetic field, the portion of the synchronizer may contact the first clutch plate. In response to a second magnetic field, the portion of the synchronizer may translate in the aperture toward the second clutch plate and the first clutch plate and the second clutch plate may close the air gap.

An electromagnetic clutch assembly may include a first clutch plate, a second clutch plate, and a synchronizer. The second clutch plate may define an aperture. A portion of the synchronizer may be configured to extend through the aperture. In the absence of a magnetic field, the first clutch plate and the first surface of the second clutch plate may define an air gap and the portion of the synchronizer may extend into the air gap. In response to a first magnetic field, the portion of the synchronizer may contact the first clutch plate. In response to a second magnetic field, the portion of the synchronizer may translate in the aperture toward the second clutch plate and the first clutch plate and the second clutch plate may close the air gap.

A transmission for a motor vehicle is provided. The transmission has a hydraulically or electrically operable gearshift sleeve, a clutch pack, an input shaft, and an output shaft, a gearshift sleeve, a gearshift sleeve claw, and an opposing output claw associated with the output shaft. The gearshift sleeve can be moved from an initial position into a first position, in which the gearshift sleeve transfers an axial force by way of the first ramp element and the second ramp element to the clutch pack for synchronization of the disks, and into a second position, in which the gearshift sleeve claw is connected to the output claw interlockingly in the direction of rotation and thus the input shaft and the output shaft are interlockingly coupled. A method for shifting such a transmission is also provided.

A four-wheel drive vehicle comprises: main drive wheels; sub-drive wheels; a power transmission path; a first connecting/disconnecting device; and a second connecting/disconnecting device, at least one connecting/disconnecting device of the first and second connecting/disconnecting devices including: a dog clutch; a synchronization mechanism; and an electromagnetic actuator. The four-wheel drive vehicle includes a control device providing the energization control of the electromagnetic coil based on a preliminarily stored current command value to engage the dog clutch of the one connecting/disconnecting device, and the control device learns a characteristic value indicative of an increasing characteristic of the rotation speed of the first rotating member with respect to the current command value and updates the current command value such that an increase rate of the rotation speed of the first rotating member becomes equal to a predetermined rate based on the learned characteristic value.

An electromagnetic clutch assembly may include a first clutch plate, a second clutch plate, and a synchronizer. The second clutch plate may define an aperture. A portion of the synchronizer may be configured to extend through the aperture. In the absence of a magnetic field, the first clutch plate and the first surface of the second clutch plate may define an air gap and the portion of the synchronizer may extend into the air gap. In response to a first magnetic field, the portion of the synchronizer may contact the first clutch plate. In response to a second magnetic field, the portion of the synchronizer may translate in the aperture toward the second clutch plate and the first clutch plate and the second clutch plate may close the air gap.

A four-wheel drive vehicle comprises: main drive wheels; sub-drive wheels; a power transmission path; a first connecting/disconnecting device; and a second connecting/disconnecting device, at least one connecting/disconnecting device of the first and second connecting/disconnecting devices including: a dog clutch; a synchronization mechanism; and an electromagnetic actuator. The four-wheel drive vehicle includes a control device providing the energization control of the electromagnetic coil based on a preliminarily stored current command value to engage the dog clutch of the one connecting/disconnecting device, and the control device learns a characteristic value indicative of an increasing characteristic of the rotation speed of the first rotating member with respect to the current command value and updates the current command value such that an increase rate of the rotation speed of the first rotating member becomes equal to a predetermined rate based on the learned characteristic value.

A vehicle drive unit that provides improved power transfer to a differential input member of a differential assembly. The vehicle drive unit is configured with an interlock system that is configured to inhibit the supply of electrical power from a source of electrical power if certain predetermined conditions are not met.

A transmission, in particular for a motor vehicle, is provided. The transmission has a hydraulically or electrically operable gearshift sleeve, a dutch pack, an input shaft, and an output shaft, which are rotatably mounted about an axis of rotation, a first ramp element, and a second ramp element. The gearshift sleeve has a gearshift sleeve claw, and the output shaft has an output claw, which is arranged so as to lie opposite. The gearshift sleeve can be moved from an initial position into a first position, in which the gearshift sleeve transfers an axial force by way of the first ramp element and the second ramp element to the clutch pack for synchronization of the disks, and into a second position, in which the gearshift sleeve claw is connected to the output claw interlockingly in the direction of rotation and thus the input shaft and the output shaft are interlockingly coupled. A method for shifting such a transmission is also provided.