Aircraft powerplant gearbox with selectable power coupler

An assembly for an aircraft powerplant, comprising:

• a gearbox housing;
• a power transfer shaft arranged with the gearbox housing and rotatable about a shaft axis;
• a first gear system disposed within an interior of the gearbox housing, the first gear system comprising a first system gear;
• a second gear system disposed within the interior of the gearbox housing and operationally independent of the first gear system, and the second gear system comprising a second system gear;
• and
• a power coupler including a first coupler gear, a second coupler gear, a first gear clutch member, a second gear clutch member and an intermediate clutch member;
• the first coupler gear meshed with the first system gear;
• the second coupler gear meshed with the second system gear;
• the first gear clutch member rotatable with the first coupler gear;
• the second gear clutch member rotatable with the second coupler gear;
• the intermediate clutch member translatable along the shaft axis between a first position and a second position;
• in the first position, the intermediate clutch member axially engaging the first gear clutch member, and the intermediate clutch member disengaged and axially spaced from the second gear clutch member;
• and
• in the second position, the intermediate clutch member axially engaging the second gear clutch member, and the intermediate clutch member disengaged and axially spaced from the first gear clutch member.

An assembly for an aircraft powerplant, comprising:

• a gearbox housing;
• a power transfer shaft arranged with the gearbox housing and rotatable about a shaft axis;
• a first gear system disposed within an interior of the gearbox housing;
• a second gear system disposed within the interior of the gearbox housing and operationally independent of the first gear system;
• a power coupler comprising an actuatable clutch member configured to translate axially along the shaft axis between a first position and a second position, the power coupler configured to operatively couple the power transfer shaft to the first gear system when the actuatable clutch member is in the first position, and the power coupler configured to operatively couple the power transfer shaft to the second gear system when the actuatable clutch member is in the second position;
• and
• an electric machine mounted to the gearbox housing, the electric machine comprising an electric machine rotor operatively coupled to the power coupler through the power transfer shaft.