A drive unit has a first electric rotary machine and a second electric rotary machine as well as a first shaft and a second shaft. A rotor of the first electric rotary machine is rotationally fixed to the first shaft, and a rotor of the second electric rotary machine is rotationally fixed to the second shaft. The drive unit additionally has a separating clutch. One of the two electric rotary machines is arranged at least partly radially and axially within an area radially delimited by the respective other electric rotary machine.

A twin-engine system includes a gas turbine engine comprising a core and a first output shaft drivable by the core. An electric engine has an electric motor configured to drive a second output shaft. A reduction gear box (RGB) has an RGB input drivingly engaged to both the first output shaft and the second output shaft. The RGB has an RGB output to provide rotational output to a rotatable load.

A power transmission device for a hybrid vehicle may include: a cover part mounted on a vehicle body; two motor parts embedded in the cover part; two rotor parts mounted in the respective motor parts and rotated; a transfer part selectively connected to the rotor part; a torsion damper part coupled to the transfer part; a clutch part configured to selectively connect any one of the rotor parts to the transfer part; and an output part connected to the clutch part and configured to discharge power to a transmission, wherein any one of the rotor parts is connected to the torsion damper part.

A power transmission device for a hybrid vehicle may include: a cover part mounted on a vehicle body; two motor parts embedded in the cover part; two rotor parts mounted on the respective motor parts and rotated; a torsion damper part coupled to any one of the rotor parts, and connected to an engine part; a transfer part rotatably connected to the torsion damper part; a clutch part configured to selectively connect the other one of the rotor parts to the transfer part; and an output part connected to the clutch part, and configured to discharge power to a transmission.

An engine system comprising: a housing having an accommodating cavity; a crankshaft part, a speed change mechanism and a transmission shaft are provided in the accommodating cavity; and a first motor and a second motor are located outside the accommodating cavity and provided on the housing. The crankshaft part is provided in the accommodating cavity and outputs first power. The first motor comprises a first motor shaft which is connected to an output end of the crankshaft part to convert the first power into electric energy. The second motor comprises a second motor shaft and is configured to output second power according to electric energy. The speed change mechanism is drivingly connected to the second motor shaft without connecting the output end of the crankshaft part. The transmission shaft is connected to an output end of the speed change mechanism. Also disclosed is an all-terrain vehicle.

A transport refrigeration system includes a transportation refrigeration unit and a generator (13) coupled to a wheel axle (7A) of the transport refrigeration system via a coupling (11). The generator (13) is configured to be driven to generate electricity by rotation of the wheel axle (7A) and to supply that electricity to the transportation refrigeration unit. The coupling (11) that couples the generator and the wheel axle is a magnetic coupling (11).

A twin-engine system includes a gas turbine engine comprising a core and a first output shaft drivable by the core. An electric engine has an electric motor configured to drive a second output shaft. A reduction gear box (RGB) has an RGB input drivingly engaged to both the first output shaft and the second output shaft. The RGB has an RGB output to provide rotational output to a rotatable load.

A drive unit for a powertrain of an electrically drivable motor vehicle, in particular a hybrid motor vehicle, is equipped with a first electric machine as well as a second electric machine and a first shaft as well as an output shaft. The drive unit furthermore has a separating clutch and a connection element for connection for conjoint rotation of an internal combustion engine, and wherein at least the first electric machine is operated in generator mode and the nominal rpm n.sub.1 of the first electric machine has the following relationship to the nominal rpm n.sub.2 of the second electric machine:
n.sub.1>1.2×n.sub.2.

When an output limitation value of a battery is equal to or less than a threshold, an electronic control unit determines that basic torque is able to be output from a second motor to a drive shaft. Then, the electronic control unit sets a predetermined value as a target motoring rotation speed for ending motoring of an engine by a first motor. When the output limitation value is greater than the threshold, the electronic control unit determines that the basic torque is unable to be output from the second motor to the drive shaft at the time of starting the engine, and sets a value smaller than the predetermined value as the target motoring rotation speed.

A vehicle that includes: a towing axle connected to a heat engine; a directional axle; and a complementary axle that is neither directional nor motor-driven. When the vehicle is hybridized according to the method of the invention, the wheels of the complementary axle are removed and replaced by in-wheel motors, each connected with an inverter specifically dedicated for supplying electrical power thereto from an electrical power battery. A control housing is also provided, that has built-in acceleration control devices connected to the accelerator pedal, and built-in deceleration control devices connected to the brake pedal, so as to control and monitor all the mechanisms needed for the driver to transparently accelerate and decelerate the vehicle.