A compressor for a charging device of an internal combustion engine has a compressor impeller arranged for conjoint rotation on a rotor shaft. An air supply channel conducts an air mass flow to the compressor impeller. An iris diaphragm mechanism is upstream of the compressor impeller and has multiple lamellae to close or to open a diaphragm aperture to vary a flow cross section for the air mass flow for flow against the compressor impeller. A housing at least partially delimits the air supply channel. The iris diaphragm mechanism is located in the housing. An actuator is mechanically coupled to the iris diaphragm mechanism via an opening in the housing for the purpose of actuating the iris diaphragm mechanism, wherein the actuator is arranged on the housing such that the opening is closed off by the actuator.

A compressor is disclosed for a charging device of an internal combustion engine. An iris diaphragm mechanism is arranged upstream of the compressor wheel. An actuator is mechanically coupled to an adjusting ring of the iris diaphragm mechanism for transmitting torque of an actuator shaft to the adjusting ring for rotating the adjusting ring. A pivotable coupling pin is arranged eccentrically on the actuator shaft and has a bearing bush which is displaceable along a longitudinal axis of the coupling pin. The bearing bush is mounted between two fingers of an adjusting lever of the adjusting ring so as to be displaceable along the fingers. An outer contact surface of the bearing bush is spherical. Inner contact surfaces of the two fingers are cylindrical to correspond to the spherical outer contact surface of the bearing bush and are in sliding contact with the outer contact surface of the bearing bush.

Methods and systems are provided for a boosted internal combustion engine. In one example, a system may include an intake system for supplying charge air, a compressor arranged in the intake system, a first shut-off element arranged in the intake system upstream of an impeller of the compressor, a bypass line that branches off from the intake system upstream of the first shut-off element and that rejoins the intake system upstream of the impeller, a second shut-off element arranged in the bypass line, a compressed air line that opens into the bypass line downstream of the second shut-off element, and a third shut-off element arranged in the compressed air line. A map width of the compressor may be increased by providing airflow to the impeller via the bypass line during low mass flow conditions, and impeller acceleration may be expedited by providing compressed air via the compressed air line.

A turbine for an exhaust turbocharger has a dual branch turbine housing and valve arrangement for branch connection and waste gate control. The turbine for an exhaust-gas turbocharger, having a turbine housing which has two exhaust-gas volutes through which an exhaust gas mass flow can flow and between which there is provided a separating wall and having a linear valve which has a valve element and a displacement shaft. The displacement shaft is guided through the separating wall and is arranged movably in the direction of its shaft longitudinal axis in the separating wall. The displacement shaft and the valve element are separate components which are connected to one another such that a compensation of positional and dimensional tolerances between displacement shaft and valve element during operation is made possible.

A turbocharger and method of controlling the same includes a turbine housing comprising an inlet and an outlet, turbine wheel coupled to a shaft. The turbine housing comprising a first scroll and a second scroll for fluidically coupling the inlet and the turbine wheel. The first scroll has a first end adjacent the inlet and a second end adjacent the turbine wheel. The second scroll has a third end adjacent the inlet and a fourth end adjacent the turbine wheel. An exhaust gas diverter valve is coupled to the turbine housing restricting flow into the first scroll or the second scroll.

A turbocharger includes a bearing housing into which a connecting shaft that connects a turbine wheel and a compressor wheel to each other is inserted. A seal plate is fixed to a first side in a rotation axis direction of the connecting shaft of the bearing housing. A compressor housing is fixed to a first side in the rotation axis direction of the seal plate. The connecting shaft is rotationally supported by a main body of the bearing housing. Support portions protrude outward in the radial direction of the connecting shaft from the outer circumferential surface of the main body. The support portions are spaced apart from each other in the circumferential direction of the connecting shaft. The seal plate contacts the support portions of the bearing housing from the first side in the rotation axis direction.

In an internal combustion engine with exhaust gas turbochargers which operate in parallel and of which at least one can be switched on and off by a charge air duct blocking arrangement including a charge air duct blocking element, the charge air duct blocking arrangement is adapted to provide for a certain movement characteristic of the charge air duct blocking element resulting in a slower movement of the charge air duct blocking element resulting in a longer duration for the air duct blocking element to reach its open position and a faster movement during closing resulting in a rapid closing of the charge air duct blocking element.

The present invention relates to an actuation device for a compressor inlet adjustment mechanism. The actuation device comprises a housing part and a lever assembly. The lever assembly comprises a bearing section, an input section and an output section. The output section is configured to be coupled to an adjustment ring of the adjustment mechanism on a first side of the housing part. The input section can be coupled to an actuator rod on a second side of the housing part. The lever assembly is rotatably mounted in the housing part via the bearing section on the compressor inlet side here.

A turbocharger can include a center housing; a bearing disposed in a through bore of the center housing where the through bore of the center housing defines a longitudinal axis; a shaft rotatably supported by the bearing; a compressor wheel operatively coupled to the shaft; a turbine wheel operatively coupled to the shaft; and a turbine housing assembly operatively coupled to the center housing where the turbine housing assembly includes: a turbine housing; and a cartridge that includes a nozzle wall component and a plate component that are spaced axially by spacers, where the nozzle wall component includes spacer bores for the spacers and where the nozzle wall component has a non-circular outer perimeter defined at least in part by arcs where adjacent arcs intersect at intersection points, and where each of the intersection points is radially outwardly from a respective one of the spacer bores.

A centrifugal compressor for a turbocharger includes an inlet-adjustment mechanism operable to move between an open position and a closed position. The inlet-adjustment mechanism includes a plurality of blades disposed about the compressor air inlet and located between an upstream wall surface and a downstream wall surface of an annular space within the air inlet wall. The blades are pivotable about respective pivot points such that the blades extend radially inward from the annular space into the air inlet when the blades are in the closed position so as to form an orifice of reduced diameter relative to a nominal diameter of the inlet. Aerodynamic pressure balancing across the blades is achieved by spacing features that space a majority of the upstream surface of each blade from the opposing upstream wall surface.