Hydrodynamic coupling with a speed protection mechanism and turbocompound system

Abstract

The invention relates to a hydrodynamic coupling, in particular for a turbocompound system, comprising: an impeller; and a turbine wheel, which together with the impeller forms a working chamber that can be filled with a working medium. The inventive dynamic coupling is characterised in that it is equipped with a mechanical locking device for connecting the impeller and turbine wheel in a rotationally fixed manner, said device being linked to a region of the coupling that conducts the working medium in such a way that it closes if a predetermined fill level has not been reached.

Description

technical field [0001] The present invention relates to a hydrodynamic coupling, especially a hydrodynamic coupling for a turbocompound system, especially a turbocompound system with a hydrodynamic coupling. Background technique [0002] The fluid coupling in such a turbocompound system is used to transmit torque from an exhaust gas utilization turbine arranged in the exhaust gas flow of the internal combustion engine to a crankshaft driven by the internal combustion engine in order to increase the efficiency of the transmission system. Since the crankshaft is driven by the exhaust gas utilization turbine via a fluid coupling, there is naturally an exhaust gas utilization turbine torque carrier which prevents any uncontrolled acceleration of the exhaust gas utilization turbine. If for any reason (for example due to filling losses in the coupling cycle) the torque carrier is limited or cut off, there is a possibility that the exhaust gas utilization turbine will reach the ove...

AI Technical Summary

Problems solved by technology

Even if measures could be taken to prevent complete loss of the coupler in the event of such damage, such damage would still cause the turbocompound system to experience said overspeed of the exhaust utilization turbine and damage the turbine

To avoid this, a speed monitoring of the exhaust gas recovery turbine is conventionally provided, and appropriate measures are initiated if an overspeed is determined to occur, such as switching a bypass line around the exhaust gas recovery turbine, because other measures such as switching off the drive exhaust gas It is not practical to utilize the exhaust flow of the turbo (which can only be achieved by shutting down the engine)

[0004] Another disadvantage can also be found, that is, active speed monitoring requires external power

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