Electric machine assemblies and methods of manufacturing and operating electric machine assemblies for internal combustion engines are provided. The electric machine assembly includes an electric machine configured to generate electric current by induction via a prime mover causing rotation of one of a rotor and a stator with respect to the other one of the rotor and the stator. The electric machine assembly also includes a torque transmitter including a rotating output driver coupled to the prime mover of the electric machine. The torque transmitter includes a rotating input driver configured to receive a rotary input transmitted from a crankshaft of an internal combustion engine. The rotating input driver is coupled to the rotating output driver to actuate the rotating output driver at a plurality of gear ratios.

An auxiliary power unit for an aircraft includes a rotary intermittent internal combustion engine drivingly engaged to an engine shaft, a turbine section having an inlet in fluid communication with an outlet of the engine(s), the turbine section including at least one turbine compounded with the engine shaft, and a compressor having an inlet in fluid communication with an environment of the aircraft and an outlet in fluid communication with a bleed duct for providing bleed air to the aircraft, the compressor having a compressor rotor connected to a compressor shaft, the compressor shaft drivingly engaged to the engine shaft. The driving engagement between the compressor shaft and the engine shaft is configurable to provide at least two alternate speed ratios between the compressor shaft and the engine shaft.

An auxiliary power unit for an aircraft includes a rotary intermittent internal combustion engine drivingly engaged to an engine shaft, a turbine section having an inlet in fluid communication with an outlet of the engine(s), the turbine section including at least one turbine compounded with the engine shaft, and a compressor having an inlet in fluid communication with an environment of the aircraft and an outlet in fluid communication with a bleed duct for providing bleed air to the aircraft, the compressor having a compressor rotor connected to a compressor shaft, the compressor shaft drivingly engaged to the engine shaft. The driving engagement between the compressor shaft and the engine shaft is configurable to provide at least two alternate speed ratios between the compressor shaft and the engine shaft.

Methods and systems for delivering powertrain torque of a hybrid vehicle are disclosed. In one example, torque is supplied to vehicle wheels from a piston engine, an electric machine, and a turbine engine via a planetary gear set. The planetary gear set may be configured with at least one sun gear and two ring gears.

Methods and systems for delivering powertrain torque of a hybrid vehicle are disclosed. In one example, torque is supplied to vehicle wheels from a piston engine, an electric machine, and a turbine engine via a planetary gear set. The planetary gear set may be configured with at least one sun gear and two ring gears.

An engine includes a common rail attached to one side portion of a cylinder block that pivotally supports a crankshaft in a rotatable mariner, the one side portion extending along a crankshaft center, and the common rail being configured to supply a fuel to the engine. A flywheel housing that accommodates a flywheel that is rotated integrally with the crankshaft is disposed in one side portion out of opposite side portions of the cylinder block intersecting the one side portion. One end portion of the common rail is disposed above the flywheel housing.

An engine includes a common rail attached to one side portion of a cylinder block that pivotally supports a crankshaft in a rotatable mariner, the one side portion extending along a crankshaft center, and the common rail being configured to supply a fuel to the engine. A flywheel housing that accommodates a flywheel that is rotated integrally with the crankshaft is disposed in one side portion out of opposite side portions of the cylinder block intersecting the one side portion. One end portion of the common rail is disposed above the flywheel housing.