Hybrid-electric drivetrain for an aircraft propulsion system

A propulsion system for an aircraft, the propulsion system comprising:

• an engine including an engine output shaft;
• and
• a drivetrain coupled with the engine output shaft, the drivetrain including a drivetrain output shaft, a gear assembly, and an electric motor assembly,
• the gear assembly including a drivetrain output gear mounted on the drivetrain output shaft, the drivetrain output gear and the drivetrain output shaft rotatable about a first rotational axis, and
• the electric motor assembly including a bevel gear assembly and an electric motor, the bevel gear assembly rotatable about a second rotational axis parallel to the first rotational axis, the bevel gear assembly engaged with the drivetrain output gear, the electric motor including a rotor rotatable about a third rotational axis, the third rotational axis oriented at an oblique angle relative to the second rotational axis, the rotor including an electric motor output shaft and an electric motor output gear mounted on the electric motor output shaft, the electric motor output gear engaged with the bevel gear assembly.

A propulsion system for an aircraft, the propulsion system comprising:

• an engine including an engine output shaft;
• a drivetrain coupled with the engine output shaft, the drivetrain including a propulsor output shaft, a gear box, and an electric motor assembly,
• the gear box including a gear box housing and a gear assembly, the gear box housing including a housing wall disposed between the engine and the gear assembly, the housing wall extending between and to an inner side and an outer side, the inner side facing the gear assembly, the gear assembly including a propulsor output gear mounted on the propulsor output shaft, the propulsor output gear and the propulsor output shaft rotatable about a first rotational axis, and
• the electric motor assembly including a bevel gear assembly and an electric motor, the bevel gear assembly rotatable about a second rotational axis, the bevel gear assembly engaged with the propulsor output gear, the electric motor mounted on the outer side, the electric motor including a rotor rotatable about a third rotational axis, the third rotational axis oriented at an oblique angle relative to the second rotational axis, the rotor including an electric motor output shaft and an electric motor output gear mounted on the electric motor output shaft, the electric motor shaft extending through the housing wall, the electric motor output gear engaged with the bevel gear assembly;
• and
• a propulsor interconnected with the propulsor output gear by the propulsor output shaft.