Exhaust-gas turbocharger

Abstract

An exhaust-gas turbocharger ( 1 ), having a shaft ( 2 ) on which are arranged a compressor wheel ( 3 ) and a turbine wheel ( 4 ), a bearing housing ( 5 ) in which are arranged a compressor-side bearing arrangement ( 6 ) and a turbine-side bearing arrangement ( 7 ) for the shaft ( 2 ), an oil inflow line ( 8 ) and an oil outflow line ( 9 ), and an additional oil accumulator ( 10 ) for the bearing arrangements ( 6, 7 ) of the shaft ( 2 ). The oil accumulator ( 10 ) is a pressure accumulator arranged in a branch line ( 11 ) of the oil inflow line ( 8 ), and a controllable valve ( 13 ) is arranged between the oil accumulator ( 10 ) and the opening-in point ( 12 ) of the branch line ( 11 ) into the oil inflow line ( 8 ).

1 . An exhaust-gas turbocharger ( 1 ), having
 a shaft ( 2 ) on which are arranged a compressor wheel ( 3 ) and a turbine wheel ( 4 ),   a bearing housing ( 5 ) in which are arranged a compressor-side bearing arrangement ( 6 ) and a turbine-side bearing arrangement ( 7 ) for the shaft ( 2 ),   an oil inflow line ( 8 ) for supplying oil to the bearing arrangements and an oil outflow line ( 9 ), and   an additional oil accumulator ( 10 ) for the bearing arrangements ( 6 ,  7 ) of the shaft ( 2 ),   wherein the oil accumulator ( 10 ) is a pressure accumulator arranged in a branch line ( 11 ) of the oil inflow line ( 8 ), and   wherein a controllable valve ( 13 ) is arranged between the oil accumulator ( 10 ) and an opening-in point ( 12 ) of the branch line ( 11 ) into the oil inflow line ( 8 ).   
     
     
         2 . The exhaust-gas turbocharger as claimed in  claim 1 , including a control device ( 14 ) for opening and closing the controllable valve ( 13 ) as a function of received pressure signals (DS) from the inflow line ( 8 ) and the oil accumulator ( 10 ). 
     
     
         3 . The exhaust-gas turbocharger as claimed in  claim 1 , wherein a check valve ( 15 ) is arranged in the oil inflow line ( 8 ) upstream of the opening-in point ( 12 ) of the branch line ( 11 ). 
     
     
         4 . The exhaust-gas turbocharger as claimed in  claim 1 , wherein a controllable valve is arranged in the oil inflow line ( 8 ) upstream of the opening-in point ( 12 ) of the branch line ( 11 ). 
     
     
         5 . The exhaust-gas turbocharger as claimed in  claim 1 , wherein a pressure differential valve is arranged in the oil inflow line ( 8 ) upstream of the opening-in point ( 12 ) of the branch line ( 11 ). 
     
     
         6 . The exhaust-gas turbocharger as claimed in  claim 1 , wherein the oil accumulator ( 10 ) and the valves ( 13 ,  15 ) and also the control device ( 14 ) are integrated into the bearing housing ( 5 ). 
     
     
         7 . The exhaust-gas turbocharger as claimed in  claim 1 , wherein the oil accumulator ( 10 ) and the valves ( 13 ,  15 ) and also the control device ( 14 ) are an external system.