A torque transmission arrangement includes a cylindrical friction element carrier and a snap-ring, the friction element carrier carries a pressing plate and a reaction plate of an outer friction-based torque-transmission mechanism rotationally secured to an outer surface and a pressing plate and a reaction plate of an inner friction-based torque-transmission mechanism rotationally secured to an inner surface. The friction element carrier includes through-holes distributed around the circumference of the friction element carrier. The snap-ring includes radial projections distributed around the inner or outer circumference of the snap-ring and configured to extend through said through-holes when the snap-ring is mounted on the friction element carrier, such that the snap-ring protrudes in a radial direction beyond both the inner and outer surfaces of the friction element carrier for retaining the inner and outer reaction plates of the inner and outer friction-based torque-transmission mechanisms on the friction element carrier.

A pedally propelled vehicle multi speed gear system includes a gear mechanism including a main shaft; a hollow first shaft and a hollow second shaft, both axially stationary and rotatably arranged about the main shaft; an epicyclical first gear section arranged about the main shaft between the first and second shafts, and including two radially stacked carrier elements; and a first shift mechanism arranged between the first shaft and the first gear section, and configured to rotationally engage the first shaft with either of the two radially stacked carriers. The first shift mechanism includes two first clutches radially stacked about the main shaft.

A pedally propelled vehicle multi speed gear system includes a gear mechanism including a main shaft; a hollow first shaft and a hollow second shaft, both axially stationary and rotatably arranged about the main shaft; an epicyclical first gear section arranged about the main shaft between the first and second shafts, and including two radially stacked carrier elements; and a first shift mechanism arranged between the first shaft and the first gear section, and configured to rotationally engage the first shaft with either of the two radially stacked carriers. The first shift mechanism includes two first clutches radially stacked about the main shaft.

A clutch assembly includes a first clutch having a first translator and a friction pack and a second clutch having first and second coupling members, a locking element, and a second translator. The friction pack includes a first plate fixed to the first coupling member and a second plate fixed to the second coupling member. The first translator of the first clutch is movable to an actuated position in which the plates of the friction pack are engaged with one another thereby causing angular velocities of the first and second coupling members to be synchronized. The second translator of the second clutch is movable to an extended position in which the locking element engages the first and second coupling members with one another thereby causing a power flow path through the first and second coupling members.

A clutch assembly includes a first clutch having a first translator and a friction pack and a second clutch having first and second coupling members, a locking element, and a second translator. The friction pack includes a first plate fixed to the first coupling member and a second plate fixed to the second coupling member. The first translator of the first clutch is movable to an actuated position in which the plates of the friction pack are engaged with one another thereby causing angular velocities of the first and second coupling members to be synchronized. The second translator of the second clutch is movable to an extended position in which the locking element engages the first and second coupling members with one another thereby causing a power flow path through the first and second coupling members.

A fire fighting vehicle includes a chassis, a front axle, a rear axle, a powertrain, an accessory drive, and a controller. The powertrain includes an engine, a battery system, and an electromechanical transmission coupled to the battery system, the engine, and at least one of the front axle or the rear axle. The accessory drive is positioned to receive a mechanical input from the engine and the electromechanical transmission. The controller is configured to selectively operate the powertrain in a plurality of operational modes including a standby mode and a hybrid mode. According to the standby mode, the controller is configured to operate the electromechanical transmission using stored energy stored in the battery system to drive the accessory drive with the engine off. According to the hybrid mode, the controller is configured to operate both the engine and the electromechanical transmission.

An electrified fire fighting vehicle includes a chassis, a cab coupled to the chassis, a body coupled to the chassis, a front axle coupled to the chassis, a rear axle coupled to the chassis, a water tank supported by the chassis, an energy storage system coupled to the chassis and positioned rearward of the cab, a water pump supported by the chassis, and an electromagnetic device electrically coupled to the energy storage system. The electromagnetic device is coupled to the water pump and at least one of the front axle or the rear axle. The electromagnetic device is configured to receive stored energy from the energy storage system and provide a mechanical output to selectively drive the water pump and the at least one of the front axle or the rear axle.

An electrified fire fighting vehicle includes a chassis, a cab coupled to the chassis, a body coupled to the chassis, a front axle coupled to the chassis, a rear axle coupled to the chassis, a water tank supported by the chassis, an energy storage system coupled to the chassis and positioned rearward of the cab, a water pump supported by the chassis, and an electromagnetic device electrically coupled to the energy storage system. The electromagnetic device is coupled to the water pump and at least one of the front axle or the rear axle. The electromagnetic device is configured to receive stored energy from the energy storage system and provide a mechanical output to selectively drive the water pump and the at least one of the front axle or the rear axle.

A system for a power take-off mechanism for a powertrain system is provided. The system includes an electrically powered torque generating device including a torque generating device output shaft and a transmission output shaft receiving mechanical power from the torque generating device output shaft. The system further includes a clutch selectively disengaging the transmission output shaft from the torque generating device output shaft and a power take-off module receiving mechanical power from the torque generating device.

A system for a power take-off mechanism for a powertrain system is provided. The system includes an electrically powered torque generating device including a torque generating device output shaft and a transmission output shaft receiving mechanical power from the torque generating device output shaft. The system further includes a clutch selectively disengaging the transmission output shaft from the torque generating device output shaft and a power take-off module receiving mechanical power from the torque generating device.