Transmission device for driving a fan of a cooling circuit of an internal combustion engine, associated cooling circuit, and vehicle

A transmission device for a fan of a cooling circuit of an internal combustion engine, the transmission device being configured to drive the fan in rotation and comprising:

• an input device, configured to be driven in rotation by the engine;
• and
• an output device, configured to be linked to the fan so as to drive the fan in rotation;
• wherein the transmission device comprises:
• a first clutch, which is linked to the output device;
• a second clutch, which is linked to the input device;
• a shaft, which connects mechanically the first clutch to the second clutch;
• and
• an electric motor, which is arranged on the shaft between the first clutch and the second clutch;
• and
• wherein:
• the first clutch is switchable between a closed state, where the first clutch mechanically connects the shaft to the output device, so as to couple in rotation the output device with the shaft, and an open state, where the output device is not driven in rotation by the shaft;
• the second clutch is switchable between a closed state, where the second clutch mechanically connects the shaft to the input device so as to couple the shaft in rotation with the input device, and an open state, where the shaft is not driven in rotation by the input device;
• and
• the first clutch and the second clutch are switchable, between their respective open and closed states, independently from each other.