Abstract: A method for operating a ship propulsion system. A setpoint rotational speed is determined for a propeller shaft and a setpoint pitch angle for an adjustable propeller on a control side based on an adjustable propeller characteristic diagram and an operator. An engine is determined based on a ship's engine characteristic diagram and the setpoint rotational speed for the propeller shaft. An actual engine operating point is determined as a function of a measured actual rotational speed and a measured actual torque, so that when the drive power is constant, the set-point rotational speed for the propeller shaft and the pitch angle for the adjustable propeller can be varied while reducing fuel consumption of the ship's engine and, when this is possible, the setpoint rotational speed for the propeller shaft, the setpoint pitch angle for the adjustable propeller and the setpoint operating point of the ship's engine are adapted.

Abstract: A turbocharger having a turbine with a turbine rotor, a compressor with a compressor rotor that is coupled to the turbine rotor via a shaft. A bearing housing arranged between the turbine housing and the compressor housing, wherein both the turbine housing and also the compressor housing are connected to the bearing housing, with at least one bearing, via which the shaft is mounted in the bearing housing, wherein the respective bearing includes a bearing bush that is mounted on the bearing housing in a rotationally fixed manner, wherein between the bearing bush and the bearing housing a radially outer lubricating cap and between the bearing bush and the shaft a radially inner lubricating gap is formed, and wherein axial ends of the respective bearing bush, at a radially outer section of the same have a greater axial extent than on a radially inner section of the same.

Abstract: A method for operating a premix burner for gaseous fuels having a multi-stage pilot gas system whose diffusion fuel is injected into a flame chamber of the premix burner as at least two partial streams with different orientations, and a premix burner for carrying out the method.

Abstract: A fuel valve for injecting fuel into the combustion chamber of a large two-stroke self-igniting internal engine combustion engine, with a valve needle that is resiliently biased towards a valve seat. The effective pressure surface that causes fuel pressure to urge the valve needle in the opening direction increases significantly when the valve needle has lift from the valve seat. A supplementary effective pressure surface is provided on the valve needle. The supplementary effective pressure surface creates a force urging the valve needle towards the valve seat when the supplementary effective pressure surface is exposed to fuel pressure.

Abstract: A compensator, having a first corrugated bellows section, a second corrugated bellows section, an intermediate pipe section positioned between the first corrugated bellows section and the second corrugated bellows section, a first attachment flange, and a second attachment flange. The first corrugated bellows section engages the first attachment flange and intermediate pipe section. The second corrugated bellows section engages the second attachment flange and intermediate pipe section. An intermediate flange is positioned between the first attachment flange and the second attachment flange and surrounds the intermediate pipe section at the outside without a a rigid connection to the intermediate pipe section. The intermediate flange is connected by first tension rods to the first attachment flange and by second tension rods to the second attachment flange.

Abstract: A turbocharger, with a turbine for expanding a first medium and a compressor for compressing a second medium. The turbine has a turbine housing and a turbine rotor. The compressor has a compressor housing and a compressor rotor coupled to the turbine rotor via a shaft. The turbine and compressor housings are connected to a bearing housing in which the shaft is mounted. The turbine housing has a turbine inflow housing and an insert piece for a nozzle ring with guide blades, which is connected on a first cover ring with a flange of the bearing housing. On the flange of the bearing housing multiple protrusions extending radially to the outside distributed over the circumference and first fasteners penetrate the protrusions of the flange of the bearing housing and are in engagement with the first cover ring of the nozzle ring.

Abstract: A gear wheel (10), operable for transmitting substantial torques without developing or generating undue noise and exhibiting improved vibration damping, is axially mountable for operative rotation on a shaft (25) and includes a disc-shaped or cylindrical base body (11) that defines a recess (12) for passage of the shaft. The base body (11) carries a plurality of teeth (13, 14) radially distributed about the circumference of the base body. A disc-shaped damping element (17) is releasably connected to and against a side or face of the base body so as to accommodate relative movement between the base body and the damping element in response to dynamic loads acting on the operating gear wheel. A second damping element (17) can likewise be releasably connected to and against a second or opposite side or face of the base body so as to correspondingly accommodate relative movement between the base body and the second damping element in response to dynamic loads acting on the operating gear wheel.

Abstract: Compressor stage with a stator-side intake connection piece via which medium which is to be compressed can be introduced into the compressor stage in the region of the compressor stage, with a stator-side inflow channel via which the medium to be compressed can be conveyed in direction of a rotor-side impeller proceeding from the intake connection piece, wherein the impeller has a radially inner hub, a radially outer cover disk and impeller blades extending between the hub and the cover disk, wherein a plus measuring point and a minus measuring point are provided at the compressor stage for measuring the effective pressure at the compressor stage, and wherein the minus measuring point is positioned upstream of the impeller outside of the stator-side inflow channel in an annular gap which branches off from the inflow channel.

Abstract: A valve body for a gas exchange valve of a cylinder of an internal combustion engine can be brought to lie against a valve seat of the gas exchange valve for closing the gas exchange valve and can be removed from the valve seat to open the gas exchange valve. The valve body is formed in multiple parts and has a first valve disc part interacting with the valve seat and a second valve disc part that is connected to the first valve disc part in a fixed manner and faces a combustion chamber of the cylinder. Between the first valve disc part and the second valve disc part a hollow space serving at least for the cooling of the second valve disc part is formed.

Abstract: A device for the air supply of a fuel cell via two compressor stages, designed with a first compressor of a turbocharger that is drive-effectively connected to a turbine of the turbocharger that can be driven by an exhaust gas flow of the fuel cell, and a supply air supply of the first compressor is connected to the second compressor via an air passage for supplying air compressed by the second compressor.

Abstract: A spark plug for an internal combustion engine, having a center electrode, which has a first body and a second body that is a precious metal welded to the first body and a ground electrode arranged roundabout the center electrode so that an annular ignition gap is formed between the electrodes. The second body of the center electrode is formed as an annular element having a central recess. The first body of the center electrode has a projection that extends into the recess of the second body. A first weld seam is formed between a radially outer surface of the projection of the first body and a radially inner surface of the second body delimiting the recess of the second body, and a second weld seam is formed between an axial surface of the main body of the first body and an axial surface of the second body.

Abstract: A fluid flow machine, in particular turbocompressor, with a housing, having a rotor mounted in the housing, and with a dry gas seal for sealing the rotor relative to the housing. The housing at least one recess or bore for a gaseous medium is introduced, via which the gaseous medium for temperature-controlling the dry gas seal can be conducted in the direction of the same. The gaseous medium can be directly conducted into a gas space formed between the housing and the dry gas seal via the or each recess or bore. Additionally or alternatively, the or each recess or bore receives a guide tube for the gaseous medium.

Abstract: An exhaust-gas aftertreatment device (10) for an internal combustion engine, particularly for a marine diesel internal combustion engine operated using heavy fuel oil, includes a housing (11); an exhaust-gas chamber (12) defined by the housing (11), for permitting exhaust gas to flow continuously through the housing (11), an inlet (13) for permitting exhaust gas to flow into the housing and an outlet (14) for permitting exhaust gas to flow out of the housing (11); a sound damping chamber (15), defined by the housing (11) and coupled with the exhaust-gas chamber (12). The sound dampening chamber (15) is constructed to receive a fluid or a pourable solid at a fill level depending on the frequency of an exhaust sound to be damped.

Abstract: A method for producing a turbomachine impeller, which has a radially inner hub body, a radially outer shroud body and blades extending between the hub body and the shroud body. The blades, the hub body and the shroud body are designed as an integral, monolithic assembly includes providing a blank; milling the blank to form a basic contour of the hub body, the shroud body, and the blades; performing build-up welding or additive manufacturing at least once on the main contour that is formed and subsequently performing milling at least once on portions that are formed by the build-up welding.

Abstract: Tilting segment for a shaft bearing device, with a base body that has a slide bearing face bounded by a segment leading edge extending in axial direction, a segment trailing edge likewise extending in axial direction, and by lateral edges extending in circumferential direction between the segment leading edge and the segment trailing edge. A groove that extends in axial direction and is located nearer to the segment trailing edge than it is to the segment leading edge is incorporated in the slide bearing face.

Abstract: A large two-stroke turbocharged compression-ignited internal combustion crosshead engine with a plurality of cylinders has at least one pressure booster for each cylinder for boosting fuel pressure, two or more electronically controlled fuel valves for each cylinder with an inlet of the two or more electronically controlled fuel valves being connected to an outlet of the at least one pressure booster. An electronic control unit is connected to the at least one pressure booster and the two or more electronically controlled fuel valves. The electronic control unit is configured to determine a start time for a fuel injection event, activate the at least one pressure booster ahead of the determined start time and pen the two or more electronically controlled fuel valves at the determined start time.

Abstract: A guide vane adjusting device for rotating guide vanes in a guide vane assembly having a driveshaft and a control ring that transmits a driveshaft rotation of the driveshaft to rotate the guide vanes. Each guide vane has a front and a rear vane part, which can be rotatable relative to each other about a respective guide vane rotational axis. The driveshaft is directly coupled to one of the guide vanes such that the vane parts are directly rotated without the interposition of the control ring. The driveshaft is indirectly coupled to the other guide vanes such that the guide vane parts are rotated indirectly with the interposition of the control ring. A respective drive lever acts on a bearing pin of the front vane part and a bearing pin of the rear vane part of the guide vane. The drive lever are coupled together via a respective coupling device.

Abstract: Internal combustion engine and method for controlling the operation of an internal combustion engine, wherein the method comprises: determining an operating load of the internal combustion engine, controlling the operation of the internal combustion engine on the basis of a standard control map which realizes a determined propulsion power of the internal combustion engine when the operating load of the internal combustion engine is constant and, when the operating load of the internal combustion engine increases to a predetermined extent, activating at least one control characteristic for modifying the standard control map so that the propulsion power of the internal combustion engine is increased.

Abstract: Catalytic converter unit for an exhaust gas catalytic converter, in particular an SCR catalytic converter unit for an SCR catalytic converter of a marine diesel internal combustion engine, with multiple catalytic converter modules. Each catalytic converter module has a ceramic catalytic converter body through which exhaust gas flows and a metallic casing for the ceramic catalytic converter body. The respective ceramic catalytic converter body is received in the respective metallic casing and is surrounded in certain sections by the latter. The catalytic converter modules are positioned with first flowed-through ends on a support grating. A counter-brace is positioned at the opposite second flowed-through ends of the catalytic converter modules, and the catalytic converter modules are clamped between the support grating and the counter-brace.

Abstract: A method for determining a gas consumption of a gas-powered gas engine or a gas-powered dual-fuel engine. The engine is operated under actual operating conditions, and the actual gas consumption of the engine is acquired under the actual operating conditions. A target gas consumption of the engine to be anticipated under target operating conditions is calculated depending on the actual gas consumption and depending on discrepancies between the actual operating conditions and the target operating conditions.