Abstract: The device serves for sealing a bearing housing of an exhaust-gas turbocharger, from which a rotor is led into a chamber of the turbocharger subjected to a mass flow. The device includes a sealing ring arranged in a groove of the rotor, a seat, arranged on the bearing housing and on which a pre-stressed sealing ring is secured by an outward-facing circumferential surface, and a radially extending separation gap, which leads annularly around the axis of rotation of the rotor and is defined by two superimposed sliding surfaces, the first of which is arranged on a first face of the sealing ring and the second of which is arranged on a first flank of the groove. In order to reduce a heat input into the sealing ring caused by lapping of the sealing ring during operation of the exhaust-gas turbocharger, a depression annularly around the axis is formed into the second flank of the groove. The depression is defined radially outwards by an annular body formed into the rotor.

Abstract: Depending on the actual operating situation and the composition of the fuels used for driving the internal combustion engine, contamination of the moving blades, of the guide device and of the turbine casing parts occurs sooner or later in the exhaust gas turbine. According to the invention, a small quantity of cleaning fluid is fed continuously or cyclically into the exhaust gas flow of an exhaust gas turbine and is directed onto the components to be cleaned. The small quantity of cleaning fluid can be fed in with unchanged operation of the internal combustion engine, such that the exhaust gas turbine can be cleaned or kept clean within the entire operating range of the internal combustion engine. Fluctuations in the power output of the internal combustion engine on account of requisite cleaning of the exhaust gas turbine therefore do not occur. Furthermore, the formation of thermostress cracks in the critical turbine casing parts is largely avoided.

Abstract: Depending on the actual operating situation and the composition of the fuels used for driving the internal combustion engine, contamination of the moving blades, of the guide device and of the turbine casing parts occurs sooner or later in the exhaust gas turbine. According to the invention, a small quantity of cleaning fluid is fed continuously or cyclically into the exhaust gas flow of an exhaust gas turbine and is directed onto the components to be cleaned. The small quantity of cleaning fluid can be fed in with unchanged operation of the internal combustion engine, such that the exhaust gas turbine can be cleaned or kept clean within the entire operating range of the internal combustion engine. Fluctuations in the power output of the internal combustion engine on account of requisite cleaning of the exhaust gas turbine therefore do not occur. Furthermore, the formation of thermostress cracks in the critical turbine casing parts is largely avoided.

Abstract: Improved cleaning of the nozzle ring and the moving blades of the axial turbine of a turbocharger is to provided by a cleaning device. The cleaning device (20) includes only one nozzle (21, 44) having at least one injection opening (24) as well as a cleaning-agent feed line (23). The injection opening (24) is arranged at any point (38) of an imaginary circular area (34), which in turn is defined by a center (33) arranged at a distance A upstream of the inner casing wall (11) as well as by a diameter d.sub.k. The center (33) lies on an imaginary parallel area (34) formed at a distance A from the inner casing wall (11). The distance A corresponds to the average diameter of the nozzle ring (8) multiplied by a percentage P.sub.1, (5%.ltoreq.P.sub.1 .ltoreq.30%). The center (33) lies at an intersection point (36) of the parallel area (35) and die flow line (17) intersecting the latter at right angles. The diameter d.sub.