Transmission powertrain vehicle and method

A powertrain for a vehicle, said powertrain comprising:

• at least one torque source having a rotor;
• and
• a transmission connected to the rotor, said transmission comprising:
• an input shaft;
• an output shaft;
• a planetary gearset being driven by the input shaft and being couplable to the output shaft in a high gear mode and a low gear mode of the transmission, wherein the input and output shafts are arranged rotatably and coaxially along an axis, and wherein the planetary gearset comprises a sun gear connected to the input shaft, a ring gear that is axially movable, and at least one planet gear rotatably supported on a planet gear carrier that is connected to the output shaft;
• a coupling disc connected to the input shaft;
• an axially moveable coupling sleeve being configured to selectively connect the planet gear carrier with the coupling disc in an engaged position of the coupling sleeve to provide the high gear mode;
• and
• a synchronizer ring arranged between the coupling sleeve and the ring gear,
• wherein the synchronizer ring is configured to transfer an axial motion of the ring gear in a first direction towards the coupling sleeve and the coupling disc, and
• wherein the coupling sleeve is moveable from an unengaged position into the engaged position at least in part by the synchronizer ring.

A vehicle comprising a powertrain, said powertrain comprising:

• at least one torque source having a rotor;
• and
• a transmission connected to the rotor, said transmission comprising:
• an input shaft;
• an output shaft;
• a planetary gearset being driven by the input shaft and being couplable to the output shaft in a high gear mode and a low gear mode of the transmission, wherein the input and output shafts are arranged rotatably and coaxially along an axis, and wherein the planetary gearset comprises a sun gear connected to the input shaft, a ring gear that is axially movable, and at least one planet gear rotatably supported on a planet gear carrier that is connected to the output shaft;
• a coupling disc connected to the input shaft;
• an axially moveable coupling sleeve being configured to selectively connect the planet gear carrier with the coupling disc in an engaged position of the coupling sleeve to provide the high gear mode;
• and
• a synchronizer ring arranged between the coupling sleeve and the ring gear,
• wherein the synchronizer ring is configured to transfer an axial motion of the ring gear in a first direction towards the coupling sleeve and the coupling disc, and
• wherein the coupling sleeve is moveable from an unengaged position into the engaged position at least in part by the synchronizer ring.

A method of shifting a transmission, wherein the transmission comprises an input shaft, an output shaft, and a planetary gearset being driven by the input shaft and being couplable to the output shaft in a high gear mode and a low gear mode of the transmission, the input and output shafts being arranged rotatably and coaxially along an axis, wherein the planetary gearset comprises a sun gear connected to the input shaft, a ring gear that is axially movable, and at least one planet gear rotatably supported on a planet gear carrier that is connected to the output shaft, wherein the transmission further comprises a coupling disc connected to the input shaft, an axially moveable coupling sleeve, and a synchronizer ring arranged between the coupling sleeve and the ring gear, and

• wherein in order to connect the planet gear carrier with the coupling disc in an engaged position of the coupling sleeve to provide the high gear mode, the method comprises:
• moving the ring gear in an axial motion in a first direction towards the coupling sleeve and the coupling disc;
• transferring via the synchronizer ring the axial motion of the ring gear to the coupling sleeve;
• and
• at least partially moving the coupling sleeve with the synchronizer ring from an unengaged position towards the engaged position.