Hydrodynamic working circuit with device for reducing air circulation losses
AssigneeJ. M. Voith GmbH
InventorsBerthold Herrmann, Klaus Brosius, Olaf Spitzer, Rudolf Fetzer
Life of this patent
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Abstract
For the reduction of capacity losses and heating in hydrodynamic working circuits, especially retarders, caused by undesired air circulation in emptied condition, it is suggested to introduce a certain quantity of a blocking medium into the working chamber. This blocking medium may be operating fluid, air, or a mixture of both, and can be introduced radially from the inside, from the outside, or from the center. It forms a blocking film by rotation of the bladed rotor wheel, which substantially prevents the circulation of air from one bladed wheel to the other.
Claims20
A hydrodynamic retarder comprising:
- at least two wheels fitted with blades, which together form a toroidal working chamber,
- a main fluid circuit for filling the working chamber at least partially with a working medium in an ON condition and substantially emptying the working medium from the working chamber in an OFF condition, and
- means for reducing air circulation in the working chamber in the OFF condition, including secondary fluid circuit means for introducing a small quantity, in comparison with the volume of the working chamber, of a flowable blocking medium, into the working chamber, for causing reduction of the air circulation between the bladed wheels;
- wherein said secondary circuit means comprises a supply channel for the blocking medium having nozzle means for introducing a jet of the blocking medium into the working chamber.
Dependencies are inferred from the claim text.