Transverse mounted accessory gearbox

A gas turbine engine comprising an accessory gear box (AGB) configured to drive one or more accessories of a gas turbine engine having a drive shaft, the drive shaft having a rotational axis, the drive shaft coaxially and serially coupling at least a compressor and a combustor of the gas turbine engine, the AGB comprising:

• a housing having an opening;
• two or more gears mounted within the housing, each of the two or more gears rotating about its own axis, each axis being parallel to the other axis and both axes being substantially perpendicular to the rotational axis of the drive shaft of the gas turbine engine, each of the gears arranged in the AGB to form a single row within the AGB, the single row extending along an axis substantially parallel to the rotational axis of the drive shaft;
• and
• a tower shaft that couples one of the two or more gears to the drive shaft, the tower shaft having a longitudinal axis that is transverse to the rotational axis of the drive shaft and the axes of the two or more gears.

A gas turbine engine, comprising:

• a compressor, a combustor and an exhaust turbine are each coaxially and serially coupled by a drive shaft having a rotational axis;
• and
• an accessory gear box (AGB), the AGB further comprising:
• a housing having an opening;
• two or more gears mounted within the housing, each of the two or more gears rotating about its own axis, each axis being parallel to the other axis and both axes being substantially perpendicular to the rotational axis of the drive shaft of the gas turbine engine, each of the gears arranged in the AGB to form a single row within the AGB, the single row extending along an axis substantially parallel to the rotational axis of the drive shaft;
• a translational gear;
• and
• a tower shaft with a first end and a second end, the first end connected to one of the two or more gears via the translational gear and the second end connected to the drive shaft via the opening in the housing, the tower shaft having a longitudinal axis that is transverse to the rotational axis of the drive shaft and the axes of the two or more gears.