Vehicle transmission system fitted with an electrical retarder

A transmission system for a self-propelled land vehicle, the system comprising:

• a transmission mechanism driven by the engine of the vehicle and having a case and an outlet shaft rotatable about an axis;
• a universal joint mounted on the outlet shaft of the transmission mechanism;
• and
• an eddy current electrical retarder comprising both an annular inductor stator cantilevered-out from the case by means of a framework with a ring of coils disposed around the universal joint, and a rotor including first and second wheels, each of the wheels comprising a core disk of ferromagnetic material and a plurality of blades forming cooling fins, the first wheel being close to the case and the second wheel being further away from said case, said two wheels being disposed axially on either side of the stator and being secured to the outlet shaft of the transmission mechanism by means of an intermediate tube extending axially between first and second ends surrounding the universal joint, the first end of the intermediate tube being mounted on a support member secured to the outlet shaft of the transmission mechanism, and the second end of said intermediate tube being secured to the second wheel of the rotor;
• wherein the first end of the intermediate tube is also secured to the first wheel of the rotor;
• and
• wherein the first and second ends of the intermediate tube are disposed axially on either side of the ring of coils of the stator and on either side of the universal joint.