A shifting device for a motor vehicle transmission includes several transmission shafts which each are rotatable about a transmission axis, a synchronizer ring which is firmly connected with a transmission shaft, a first disk carrier, a plurality of first disks which are non-rotatably and axially shiftably connected with the first disk carrier, a second disk carrier which is axially shiftable relative to the first disk carrier and in circumferential direction can be coupled with the synchronizer ring both frictionally and positively, a plurality of second disks which are non-rotatably and axially shiftably connected with the second disk carrier and form a multidisk clutch with the first disks, and an actuating body for axially pressurizing the second disk carrier, wherein the actuating body and the second disk carrier are rotatable relative to each other in circumferential direction and substantially are firmly connected with each other in axial direction.

A case-emphasized propulsion method improves vehicle fuel efficiency. The ratio of the most-used speed to the most-desired speed of an IC engine is employed to control the engine to always run at its optimal working state with an efficient single-stage gear transmission. The propulsion method used with different brands of IC engines demonstrates a reduction in fuel consumption between 5 and 39%. An n-ratio automatic single-stage gear transmission implements the propulsion method. The transmission design executes the proposed propulsion method as well a continuous transmission, but it can also increase the propulsion efficiency about 8 to 18% when applied to replace traditional automatic transmissions or continuously variable transmissions in vehicle drivetrains.

A wedge clutch, including: an outer carrier; a first clutch plate non-rotatably connected to the outer carrier; a wedge clutch plate; a hub radially inward of the outer carrier; an engagement assembly including a pin partially disposed within the hub and in contact with the wedge clutch plate; and an actuator. For a first synchronization stage for closing the wedge clutch: the actuator is arranged to clamp the first clutch plate and the wedge clutch plate; and a first portion of the pin extending radially outward beyond an outer circumference of the hub is arranged to transmit torque between the hub and the carrier. For a second synchronization stage for closing the wedge clutch: the hub or the wedge clutch plate are arranged to circumferentially displace with respect to each other; and the wedge clutch plate is arranged to displace the pin radially inward.

This invention relates to a shifting device for a motor vehicle transmission, in particular a fully automatic stepped transmission, comprising several transmission shafts which each are rotatable about a transmission axis, a synchronizer ring which is firmly connected with a transmission shaft, a first disk carrier, a plurality of first disks which are non-rotatably and axially shiftably connected with the first disk carrier, a second disk carrier which is axially shiftable relative to the first disk carrier and in circumferential direction can be coupled with the synchronizer ring both frictionally and positively, a plurality of second disks which are non-rotatably and axially shiftably connected with the second disk carrier and form a multidisk clutch with the first disks, and an actuating body for axially pressurizing the second disk carrier, wherein the actuating body and the second disk carrier are rotatable relative to each other in circumferential direction and substantially are firmly connected with each other in axial direction.

Systems and methods are provided for a friction assisted dog clutch assembly, comprising: a piston; one or more pins, wherein the pins are adapted to be moved by the piston; one or more friction discs, wherein the friction discs have a number of slots and the plurality of pins pass through the slots; and an endplate, wherein the endplate has a number of recesses adapted to receive the pins.

Systems and methods are provided for a friction assisted dog clutch assembly, comprising: a piston; one or more pins, wherein the pins are adapted to be moved by the piston; one or more friction discs, wherein the friction discs have a number of slots and the plurality of pins pass through the slots; and an endplate, wherein the endplate has a number of recesses adapted to receive the pins.