Slide ring seal arrangement of a hydrodynamic retarder, and hydrodynamic retarder

Abstract

The invention relates to a mechanical seal arrangement, in particular a retarder-mechanical seal arrangement, comprising a first mechanical seal with a first rotating slide ring and a first stationaryslide ring which define a first sealing gap in between them, an additional seal, a cooling medium space which is filled with a cooling medium and extends all the way to the sealing gap of the first mechanical seal, wherein the first mechanical seal seals the cooling medium space against an environment, a cooling medium access into the cooling medium space for supplying cooling medium, and a cooling medium exit from the cooling medium space for draining cooling medium, wherein the additional seal is arranged in the cooling medium access, and wherein the additional seal is configured to open when a pressure inside the cooling medium access rises above a first pressure inside the cooling medium space, and to close at a second pressure inside the cooling medium access that is lower than the first pressure inside the cooling medium space.

Description

technical field [0001] The invention relates to a mechanical seal device of a hydraulic reducer and a hydraulic reducer with the mechanical seal device. Background technique [0002] Hydrodynamic retarders are used in the drives of vehicles, especially for vehicles such as trucks or buses. In this case, the gear unit is activated or deactivated by filling and emptying the gear unit working chamber, in which the stator and the rotor connected to the gear unit shaft are arranged. The working medium is liquid, usually oil or water. The retarder is usually used for vehicle braking. To seal the gear unit against the environment, mechanical seals can be used, for example. The problem that arises here is that, when the retarder is not in operation, that is, when there is no liquid in the retarder chamber and the vehicle has not braked for a relatively long period of time, for example, there is not enough pressure on the mechanical seal. The lubricating medium supplied by the li...

AI Technical Summary

Problems solved by technology

The problem that arises here is that, when the retarder is not in operation, that is, when there is no liquid in the retarder chamber and the vehicle has not braked for a relatively long period of time, for example, there is not enough pressure on the mechanical seal. Lubricating medium supplied by liquid

This can lead to so-called dry running of the mechanical seal, which leads to excessive heat generation at the mechanical seal and, in extreme cases, to damage or failure of the mechanical seal

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