Two speed gear reducer for electric drive module

An electric drive module (EDM) for an electrified vehicle, the EDM having an electric motor and a two-speed gearbox assembly, the two-speed gearbox assembly comprising:

• a housing;
• a first planetary gearset including a first sun gear, a first ring gear and a first planetary carrier, wherein the first sun gear is coupled to an output of the electric motor;
• a second compound planetary gearset including a second sun gear, a second ring gear and a second compound planetary carrier, wherein the second sun gear is directly coupled to the first carrier;
• a third planetary gearset including a third sun gear, a third ring gear and a third planetary carrier, wherein the third sun gear is directly coupled to the second sun gear, and wherein the third planetary carrier is coupled to an output of the two-speed gearbox assembly;
• a first torque transfer device that selectively couples the second ring gear to the housing;
• and
• a second torque transfer device that selectively couples the first ring gear to the housing;
• wherein the gearbox assembly is selectively switchable among (i) a first gear where the first torque transfer device is engaged grounding the second ring gear to the housing, and the second torque transfer device is disengaged;
• and (ii) a second gear where the second torque transfer device is engaged grounding the first ring gear to the housing, and the first torque transfer device is disengaged.