Gearbox for electric off-road vehicles

A two-speed gearbox assembly for an electric drive vehicle, the gearbox assembly comprising:

• a housing;
• a first planetary gear set configured to operably connect to an output of an electric motor;
• a second planetary gear set rotationally coupled to an output of the first planetary gear set;
• a third gear set rotationally coupled to an output of the second planetary gearset;
• a gearbox output shaft configured to rotationally couple the third gear set to a differential;
• a first clutch configured to selectively couple the first planetary gear set to the second planetary gear set;
• and
• a second clutch configured to selectively ground a portion of the second planetary gear set to the housing,
• wherein the gearbox assembly is selectively switchable between (i) an on-road first gear where the first clutch is engaged and the second clutch is disengaged, and (ii) an off-road second gear where the first clutch is disengaged and the second clutch is engaged to provide sustained high torque and low speed, and
• wherein the gearbox assembly can only shift between the on-road first gear and the off-road second gear when the electric motor is at zero speed.

A two-speed gearbox assembly for an electric drive vehicle, the gearbox assembly comprising:

• a housing;
• a first planetary gear set configured to operably connect to an output of an electric motor;
• a second planetary gear set rotationally coupled to an output of the first planetary gear set;
• a third gear set rotationally coupled to an output of the second planetary gearset;
• a gearbox output shaft configured to rotationally couple the third gear set to a differential;
• a first clutch configured to selectively couple the first planetary gear set to the second planetary gear set;
• and
• a second clutch configured to selectively ground a portion of the second planetary gear set to the housing,
• wherein the gearbox assembly is selectively switchable between (i) an on-road first gear where the first clutch is engaged and the second clutch is disengaged, and (ii) an off-road second gear where the first clutch is disengaged and the second clutch is engaged to provide sustained high torque and low speed,
• wherein in the on-road first gear, the electric motor output rotates in a first direction, and
• wherein in the off-road second gear, the electric motor output rotates in a second direction opposite of the first direction.