Voith Turbo Gmbh

Wolfgang Muller

Jurgen Friedrich

The invention relates to a braking system, specifically for a motor vehicle, with a hydrodynamic retarder featuring a stator impeller wheel and a rotor impeller wheel, a working medium sump, and a control device for controlling the degree of working space filling of the retarder. The control device includes a proportional valve as well as a connecting line to the sump, and the sump communicates with the working space of the retarder by way of a riser duct. A venting duct communicable with the sump whereby air pressure generated by the non-braking operation of the retarder can be vented from the sump to the atmosphere thereby providing a pressure balance of the forces acting on the level of the working medium sump.

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Crailsheim, Germany

Wolfgang Muller