Turbocharger comprising a torsional-vibration damper

Abstract

The invention relates to an exhaust-gas turbocharger, which is operated by the exhaust gas of a combustion engine and is equipped with a rotor unit that rotates at high-speed. Said rotor unit comprises a turbocharger shaft, a turbine wheel that is rotationally fixed to the shaft, in addition to a compressor wheel that is rotationally fixed to the shaft. To increase the operational reliability of said turbocharger, a torsional-vibration damper is located on the turbocharger shaft. The torsional-vibration damper reduces torsional-vibration stresses that arise in the shaft, which are caused by motor pulsations of a higher order of the combustion engine.

1 . An exhaust gas turbocharger with a rapidly rotating rotor unit which comprises a turbocharger shaft, a turbine wheel connected fixedly in terms of rotation to the shaft, and a compressor wheel connected fixedly in terms of rotation to the shaft, the exhaust gas turbocharger being capable of being connected to an internal combustion engine and the rotor unit being capable of being operated by means of the exhaust gases from the internal combustion engine, wherein the exhaust gas turbocharger comprises means for the damping of torsional vibrations of the turbocharger shaft which are excited by higher engine orders of the internal combustion engine when the exhaust gas turbocharger is in the state connected to the internal combustion engine, the damping means comprising, a torsional vibration damper arranged on the shaft.  
     
     
         2 . The turbocharger as claimed in  claim 1 , wherein the torsional vibration damper is a viscose torsional vibration damper.  
     
     
         3 . The turbocharger as claimed in  claim 1 , wherein the torsional vibration damper is an oil displacement damper.  
     
     
         4 . The turbocharger as claimed in  claim 1 , wherein the torsional vibration damper is a rubber damper.  
     
     
         5 . The turbocharger as claimed in  claim 1 , wherein the torsional vibration damper is a silicone-oil rubber damper.  
     
     
         6 . The turbocharger as claimed in  claim 1 , wherein the torsional vibration damper is secured to the turbocharger shaft in the region of the compressor, and, in particular, on the inlet side upstream of a compressor hub of the compressor wheel.  
     
     
         7 . The turbocharger as claimed in  claim 6 , wherein the outside diameter of the torsional vibration damper is about 80% to 110%, preferably 90% to 100%, of the outside diameter of the compressor hub in that region of the compressor hub which follows the device.  
     
     
         8 . The turbocharger as claimed in  claim 1 , wherein the torsional vibration damper is arranged between the compressor wheel and the turbine wheel or in the region of the turbine.  
     
     
         9 . The turbocharger as claimed in  claim 1 , wherein more than one torsional vibration damper is arranged on the turbocharger shaft, in which case the torsional vibration dampers may be arranged at various locations on the shaft and various types of torsional vibration dampers may be provided.