Abstract: Numerous cavities exist in a turbocharger for reasons of construction. If such cavities are filled with particles, inexpensive particle vibration dampers can be realized. Moreover, advantages with regard to additional containment security result in the case of possible bursting of the compressor wheel, and also with regard to noise suppression.

Abstract: A sealing assembly comprises a bore in a housing, a plurality of seal rings and a shaft. The bore comprises a plurality of seats disposed at different seat radius for the seal rings. The bore comprises for each pair of adjacent seats axially inward of an inner end of the outward seat and proximate to the inward seat a chamfer extending radially inwardly over an inward axial distance. The chamfer between each pair of seats allows for the radial contraction of the seal rings upon assembly.

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: Rotor blades and hub of the impeller are cleaned by means of a cleaning fluid jet which is directed along the rotational axis of the impeller onto the impeller. The cleaning fluid jet in this case is directed, or sprayed, towards the impeller by a feed nozzle which is arranged on the axis and oriented in the direction of the impeller along the axis. The feed jet in this case follows the axis and therefore strikes the hub of the impeller in the rotational center of the impeller. This achieves the effect of the cleaning fluid striking the impeller in the rotational center of the impeller. The cleaning fluid flows, therefore, along the hub surface and is carried radially into the radially outer regions by means of centrifugal forces.

Abstract: The exhaust-gas turbine comprises a turbine casing, a shaft rotatably mounted in a bearing housing, a turbine wheel arranged on the shaft, and a heat-protection wall, the heat-protection wall defining with the turbine casing an inflow passage leading to the turbine wheel. The heat-protection wall has two seatings, the first seating resting on the bearing housing and the second seating resting on the turbine casing. If the heat-protection wall becomes hot, the two seatings are pressed against the bearing housing and the turbine casing. The turbine casing is pressed outward in the radial direction. Centering of the heat-protection wall and thus also of the turbine casing is ensured by the radially inner seating of the heat-protection wall.

Abstract: The exhaust-gas turbine comprises a turbine casing, a shaft rotatably mounted in a bearing housing, a turbine wheel arranged on the shaft, and a heat-protection wall, the heat-protection wall defining with the turbine casing an inflow passage leading to the turbine wheel. The heat-protection wall has two seatings, the first seating resting on the bearing housing and the second seating resting on the turbine casing. If the heat-protection wall becomes hot, the two seatings are pressed against the bearing housing and the turbine casing. The turbine casing is pressed outward in the radial direction. Centering of the heat-protection wall and thus also of the turbine casing is ensured by the radially inner seating of the heat-protection wall.

Abstract: By means of a pre-swirl device, in steady-state engine operation, the rotational speed lines of the compressor are moved, by increasing the swirl at the compressor inlet in the rotational direction of the compressor, to such an extent that the steady-state operating point of the compressor comes to rest approximately at the absorption limit of the compressor. In this way, the level of the charge pressure can be adjusted in a controlled fashion to the value required for the respective engine operating point. In the event of a sudden increase in the engine load, it is possible by resetting the pre-swirl grate to generate a charge pressure increase without a time-consuming rotor acceleration. The pre-swirl device therefore simultaneously assumes the functions of charge pressure and engine load control.

Abstract: The fastening arrangement (26) for an impeller (22) on a shaft (14), in particular for an impeller (22) of a turbocharger on a turbocharger shaft (14), comprises a bush (34), which can be screwed onto a shaft journal (20) of the shaft (14), and a shaft-side hub extension (30) of the impeller (22) having a central recess (32), into which the bush (34) can be inserted in a frictional manner. The hub extension (30), at least in the region of its shaft-side end, is designed approximately in the form of a hollow cylinder. The fastening arrangement (26) also comprises a press sleeve (36) which can be frictionally connected radially on the outside to the hub extension (30).

Abstract: A stator arrangement, or distributor, for a turbine machine is disclosed which includes a guide blade. The blade shaft is supported to be able to pivot around the pivot axis, with a part which is to be guided being situated to the outside. The pivoting device contains a setting ring which is located outside a flow channel and which can be pivoted around the turbine axis, and adjusting levers which transmit torque from the setting ring to the blade shaft of each guide blade. The adjusting lever is slipped with one end onto the blade shaft. The other end can be configured as a ball head, the adjusting levers being guided in a groove of the setting ring. The surface which acts on the ball head of the adjusting lever for transmission of torque from the setting ring to the blade shaft of each guide blade can be configured as a ball socket. Exemplary embodiments can yield a uniform large-area pressure distribution by which the wear of the parts which press on one another can be distinctly reduced.

Abstract: The guiding device of a turbine has guide vanes which are rotatably mounted in the turbine housing. A sealing sleeve is arranged between the turbine housing and the guide vane stem. The additional axial compression spring ensures that the sealing sleeve is continuously pressed onto the guide vane mating contour, and that the axial gap and also the leakage flow are prevented as a result.

Abstract: In a turbocharger (1), comprising a turbine (2) and a compressor (3) connected to the turbine (2), the turbine (2) contains a turbine wheel (4) and the compressor (3) contains a compressor wheel (7) which are connected to one another by means of a shaft (10) and are arranged in a housing (5, 9, 16). During operation, if the compressor wheel (7) separates from the shaft (10), an axial force acts on the turbine wheel (4) and the shaft (10) connected thereto. A means (22, 25) for axially locking the shaft and the turbine wheel connected thereto in the housing (5, 9, 16) is arranged on the shaft (10) connected to the turbine wheel (4).

Abstract: The hub/blade junction of each rotor blade is placed with respect to the scalloping surface (F1+F2) such that this surface is supported as symmetrically as possible by the rotor blade. The turbine wheel with three-dimensionally curved rotor blades has scalloping in the area of the hub rear wall, and in consequence is subject to reduced stresses caused by scalloping deformation.

Abstract: The nozzles are in the form of blowing-in openings in the housing wall which bounds the flow channel. The blowing-in openings are fed directly by means of air which is extracted from the flow channel downstream from the diffusor. This air is at a higher pressure than the flow in the flow channel upstream of the diffusor. This results in a passive, dynamic stabilization system for a compressor stage in the high pressure-ratio range, which does not require any additional control or actuating elements.

Abstract: The use of spring clamping clips between two adjacent guide vane shafts leads to a defined force on the bearing points of the guide vane in the guide bush. The seating force, resulting from the clamping force and the flow-related lift/drift forces, of the guide vane in the guide bush is therefore always positive and the guide vane rests constantly in the guide bush.

Abstract: The guide device for the diffusor at the compressor impeller outlet of a radial compressor has guide blades with stepped inlet edges. The step is implemented by setting back the hub-side inlet edge. This meridional stepping divides the guide blades into two component blades, of which the first component blade is made longer than the second component blade. The set-back of the inlet edge of the hub-side component blade and the associated superposition of the noise fields which are produced on the front and rear inlet edge of the diffusor leads to improvement of the acoustic properties of the compressor.

Abstract: The preswirl guide device for generating a preswirl in the intake region of a compressor comprises a multiplicity of guide vanes, which are pivotable about a respective vane shank connected to the guide vane, and a pivotable adjusting ring and adjusting levers for transmitting torque from the adjusting ring to the vane shank of each guide vane. The vane shank and the adjusting lever of the respective guide vanes are of one-piece design. The casing in which the guide vanes are rotatably mounted consists of at least two parts joined together in the region of the bearings of the guide vanes. Due to the one-piece design of the guide vane, the number of components to be fitted is reduced. This simplifies the fitting and possible service work on the guide device.

Abstract: A guide device with adjustable guide vanes is provided with a drive for the adjustable guide vanes, in which a cylindrical driving pin and an adjusting lever are provided each with one surface pair which are matched to one another and which slide on one another in operation when the guide vanes are being adjusted. To adjust the guide vanes, the adjusting ring is moved, by which the driving pin attached to the adjusting ring slides in an elongated groove of the adjusting lever and applies a force to the adjusting lever. This approach yields an economical and durable structure which is easy to install. This results in surface support with the corresponding low compressive loads per unit area and consequently greatly reduced wear.

Abstract: Guide vanes are supported in a two-part or multipart housing (32, 33). Housing separation takes place radially in the region of the bearing point (25) of the vane shaft so that the separating joint (36) between the housing parts (32, 33) leads through the bearing openings (34) which are designed to hold the vane shafts. The completely round opening (34) leads to the bearing point of the vane shaft having large-area support in any position. Thus high surface pressures can be avoided.

Abstract: The invention proposes a securing device (26) for securing a turbocharger (12) comprising a turbocharger casing (14) to a base (28). The securing device (26) has a first foot (30) which can be fixed in the base (28) and a second foot (32) which can be fixed in the base (28), it being possible for the two feet (30, 32) to be connected to the turbocharger casing (14) at an axial distance from one another. The second foot (32) has a casing connection region (34), which can be connected to the turbocharger casing (14), and a base connection region (36), which can be connected to the base (28). The casing connection region (34) is designed in the form of a partial circle arc or circle arc. An axial strut arrangement (38) connects the casing connection region (34) and the base connection region (36) and includes an angle ? in the range from 0° to 60° with the base (28).

Abstract: A vibration suppressor and a vibration damper are configured in a system consisting of an internal combustion engine and an exhaust-gas turbo charger. The vibration suppressor and vibration damper are secured to an exposed place on the system which is subjected to strong vibrations. As the vibrations are the strongest in said area, the vibration-reducing means can be used to a maximum. The system consisting of the internal combustion engine and the exhaust-gas charger is improved in such a manner that the internal combustion engine can be operated in all of the rotational speed ranges without reducing the service life of individual components or the entire system.