Abrégé

A movable wall member, in form of an exhaust valve spindle (1) or a piston (7) for an internal combustion engine, comprises a base portion (17, 20) of an alloyed steel having a carbon-content in the range from 0.15 to 0.35% by weight, and an outer portion (14, 5) forming the surface of the wall member facing a combustion chamber. The outer portion is of a hot-corrosion-resistant alloy, which is nickel-based, chromium-based or cobalt-based. At least one buffer layer (18, 21) of an alloy is located in between the base portion and the outer portion. The alloy of the buffer layer is different from the alloyed steel of the base portion and different from the hot-corrosion-resistant alloy of the outer portion. The alloy of the buffer layer comprises from 0% to at the most 0.09% C in percent by weight of the buffer layer, and that the buffer layer has a thickness of at least 1.5 mm.

Classes IPC  ?

• F02F 3/00 - Pistons

Abrégé

A large two-stroke turbocharged diesel engine of the crosshead type provided with a plurality of cylinders (6), one or more fuel valves (23) associated with each cylinder (6) and a hydraulically actuated fuel injection piston pump (39) associated with each cylinder. The hydraulically actuated fuel injection piston pump (39) is provided with a pump piston (45) and a pump chamber (44). The engine is also provided with an outlet port of the pump chamber (44) connected to the fuel valve or fuel valves (23), a supply of a first fuel component (72) connected to an inlet port of the pump chamber (44), and supply of a second fuel component (73) connected an inlet port of the pump chamber (44). The pump chamber (44) is filled with an amount of the first fuel component and with an amount of the second fuel component in an aspirating stroke of the hydraulically actuated fuel injection piston pump (39) and the first fuel component and the second fuel component are mixed in the pump chamber (44) to form a fuel mixture and the fuel mixture in the pump chamber (44) is expelled from the pump chamber (44) and delivered to the injection valves (23) in an injection stroke of the hydraulically actuated fuel injection piston pump (39).

Classes IPC  ?

• F02M 43/02 - Pompes particulières à cet effet

Abrégé

A large two-stroke diesel engine with an electronically controlled exhaust valve actuation system includes for each cylinder an exhaust valve with a valve stem and a valve disc, an air spring operably connected to the valve stem and urging the exhaust valve towards the closed position, a hydraulic actuator operably connected to the exhaust valve, an electronically controlled hydraulic system that selectively connects the hydraulic actuator to a source of high pressure hydraulic fluid for a first short period at the start of the opening stroke of the exhaust valve, and an intermediate pressure hydraulic accumulator for a period immediately following the first short period until the exhaust valve has reached it open position, the intermediate pressure hydraulic accumulator from the start of the closing stroke of the exhaust valve until the start of a last short period at the end of the closing stroke of the exhaust valve, and to tank during the last short period of the closing stroke of the exhaust valve.

Classes IPC  ?

• F01L 9/02 - Systèmes de distribution à soupapes, à commande non mécanique à fluide, p.ex. hydraulique

Abrégé

A method for detection of pre-scuffing events in a large multicylinder two-stroke diesel engine by recognizing the characteristic temperature fluctuations of pre-scuffing events on the basis of information from at least two different cylinder related temperatures. The cylinder related temperatures are taken at different positions and may relate to different media.

Classes IPC  ?

• F02B 77/08 - Dispositifs de sécurité, d'indication ou de surveillance
• F02D 35/02 - Commande non électrique des moteurs en fonction des conditions extérieures ou intérieures aux moteurs, non prévue ailleurs des conditions intérieures
• F02D 41/22 - Dispositifs de sécurité ou d'avertissement en cas de conditions anormales
• F02D 41/00 - Commande électrique de l'alimentation en mélange combustible ou en ses constituants

Abrégé

A compression ignition internal combustion engine has combustion sensors for detecting combustion of fuel in the cylinders, and at least one electronic control unit receiving signals from the combustion sensors. A fuel mixing unit is connected with at least a first source of a first fuel and a second source of a fuel conditioner. Based on a detected start of ignition of fuel in the individual cylinder compared with start of fuel injection in said cylinder, the at least one electronic control unit controls the mixing ratio of the first fuel and the fuel conditioner in the fuel mixture delivered by the mixing unit to the fuel injectors, so that the ignitability of the fuel mixture is decreased when the ignition delay is at a predetermined value for ignition delay.

Classes IPC  ?

• F02D 41/00 - Commande électrique de l'alimentation en mélange combustible ou en ses constituants
• F02D 41/14 - Dispositions de circuits pour produire des signaux de commande introduisant des corrections à boucle fermée

Abrégé

The invention proposes a method and a device for the cleaning of engine exhaust gas. Here, good results are obtained in that the exhaust gas which is to be cleaned is firstly placed in contact with droplets, which are finely vaporized by means of spray nozzles (10), of a cleaning liquid, in that the volume flow of exhaust gas and injected cleaning liquid which is formed in this way is subsequently introduced into the lower compartment (19), which is provided with cleaning liquid, of a trough which is divided by an intermediate base (18) which is formed as a retarding element which is gas- and liquid-permeable, and from here, said volume flow is bubbled through cleaning liquid which is likewise provided in the upper compartment (20) of the trough (12), and in that the exhaust gas which rises out of the cleaning liquid provided in the upper compartment (20) is freed, by means of a change in direction, from any entrained droplets of cleaning liquid, and is preferably subsequently heated. The solid impurities which are entrained by the exhaust gas and the gases which can be washed out are collected by the droplets of the injected cleaning liquid, which droplets are subsequently absorbed by the cleaning liquid which is contained in the compartments (19, 20) of the trough (12).

Classes IPC  ?

• F01N 3/04 - Silencieux ou dispositifs d'échappement comportant des moyens pour purifier, rendre inoffensifs ou traiter les gaz d'échappement pour refroidir ou pour enlever les constituants solides des gaz d'échappement au moyen de liquides
• F01N 3/00 - Silencieux ou dispositifs d'échappement comportant des moyens pour purifier, rendre inoffensifs ou traiter les gaz d'échappement
• F01N 7/00 -
• B01D 53/78 - Procédés en phase liquide avec un contact gaz-liquide

Abrégé

The present invention relates to a large supercharged diesel engine (1), comprising a turbocharger having an exhaust gas -driven turbine (6) and a compressor (9) driven by the turbine and supplying charging air to the engine cylinders. The engine (1) is provided with a SCR reactor (20) downstreams of the turbine (6) for reducing NOx in the exhaust gases to N2 and H2O. A heating unit (19) increases the temperature of the exhaust gases at the high pressure side of the turbocharger turbine (6), so that the exhaust gases entering the SCR reactor (20) have a temperature of at least 330°C. A portion of the exhaust gas flow is branched off upstream of the turbocharger turbine (6) and led to a power turbine (31). The overall fuel efficiency of the engine is improved relative to an engine in which both the heating unit (19) and the SCR reactor (20) are placed at the low pressure side of the turbocharger turbine (6).

Classes IPC  ?

• F01N 3/18 - Silencieux ou dispositifs d'échappement comportant des moyens pour purifier, rendre inoffensifs ou traiter les gaz d'échappement pour rendre les gaz d'échappement inoffensifs par conversion thermique ou catalytique des composants nocifs des gaz d'échappement caractérisés par les méthodes d'opérationCommande
• F02B 37/00 - Moteurs caractérisés par l'utilisation de pompes entraînées au moins temporairement par les gaz d'échappement

Abrégé

The invention relates to a machine part (4) belonging to a sliding pair, having in at least the region of the side facing the machine part acting together therewith a wear-resistant structure (6) comprising relatively hard particles received in a metal matrix and having a rough and uneven surface, the production effort being reduced and good run-in behavior being achieved in that a run-in overlay (7) is applied to the wear-resistant structure (6) to smooth out the unevenness and roughness thereof, made of a run-in material suitable for wear during a run-in process, the material being different from the material of the wear-resistant structure (6) beneath it and being metallurgically bonded thereto, and being softer than the wear-resistant structure (6) and at most equally as wear-resistant as the sliding surface of the respectively opposite machine part.

Classes IPC  ?

• C23C 4/06 - Matériaux métalliques
• C23C 4/12 - Revêtement par pulvérisation du matériau de revêtement à l'état fondu, p. ex. par pulvérisation à l'aide d'une flamme, d'un plasma ou d'une décharge électrique caractérisé par le procédé de pulvérisation
• C23C 24/08 - Revêtement à partir de poudres inorganiques en utilisant la chaleur ou une pression et la chaleur
• C23C 24/10 - Revêtement à partir de poudres inorganiques en utilisant la chaleur ou une pression et la chaleur avec formation d'une phase liquide intermédiaire dans la couche
• C23C 28/02 - Revêtements uniquement de matériaux métalliques
• C23C 30/00 - Revêtement avec des matériaux métalliques, caractérisé uniquement par la composition du matériau métallique, c.-à-d. non caractérisé par le procédé de revêtement
• C22C 9/02 - Alliages à base de cuivre avec l'étain comme second constituant majeur
• C22C 29/08 - Alliages à base de carbures, oxydes, borures, nitrures ou siliciures, p. ex. cermets, ou d'autres composés métalliques, p. ex. oxynitrures, sulfures à base de carbures ou de carbonitrures à base de carbures mais ne contenant pas d'autres composés métalliques à base de carbure de tungstène

Abrégé

In the case of a device for connecting two machine parts which bear against each other along a separating gap and are held together by retaining forces running transversely with respect to the separating gap, in particular a lower part (2), which is integrated in the machine frame (1), and an upper part (3), which can be placed thereon and can be connected thereto by tie rods (4), of a large motor, lateral forces arising during installation can be avoided in a simple manner and nevertheless loadings running transversely with respect to the retaining forces can be reliably transmitted by the fact that the mutually facing bearing surfaces (5, 6) of the machine parts bearing against each other only have regions running at right angles to the retaining forces and that said regions are assigned means which increase the mutual friction and have particles (12) which are embedded into a metallic support material, project on the surface and are composed of a harder material than the material present in the region of the bearing surfaces (5, 6).

Classes IPC  ?

• F02F 7/00 - Carcasses de moteur, p. ex. carters
• F16B 2/00 - Attaches à serrage par friction largables
• F16C 9/02 - Paliers de vilebrequin

Abrégé

The invention relates to a plain bearing comprising at least one support part (7) made of a base material containing iron, which is provided with, on the running surface side, an at least radially external coating (8) made of a material containing tin. Said coating is embodied as a melted layer and is metallurgically connected to the base material by a connecting zone (9) containing FeSn2. The aim of the invention is to extend the service life of said plain bearing such that the connecting area (9) containing the FeSn2 has a maximum thickness of 10 &mgr;m.

Classes IPC  ?

• B23K 20/227 - Soudage non électrique par percussion ou par une autre forme de pression, avec ou sans chauffage, p. ex. revêtement ou placage tenant compte des propriétés des matériaux à souder avec une couche ferreuse
• B23K 26/04 - Alignement, pointage ou focalisation automatique du faisceau laser, p. ex. en utilisant la lumière rétrodiffusée
• B23K 35/28 - Emploi de matériaux spécifiés pour le soudage ou le brasage dont le principal constituant fond à moins de 950 C
• C23C 26/02 - Revêtements non prévus par les groupes par application au substrat de matériaux fondus
• F16C 33/14 - Procédés particuliers de fabricationRodage

Abrégé

During armouring of a component suspectible to wear and tear, consisting of a metallic base material, with a wear-protection layer (2) comprising at least one layer (3) provided with ceramic particles (6) accommodated in a metallic matrix (7), a high bearing capacity is achieved and damage to the base material is prevented. Said matrix (7) is made of a material whose melting point is lower than the melting point of the base material (1).

Classes IPC  ?

• C23C 24/10 - Revêtement à partir de poudres inorganiques en utilisant la chaleur ou une pression et la chaleur avec formation d'une phase liquide intermédiaire dans la couche
• C23C 26/02 - Revêtements non prévus par les groupes par application au substrat de matériaux fondus
• C23C 30/00 - Revêtement avec des matériaux métalliques, caractérisé uniquement par la composition du matériau métallique, c.-à-d. non caractérisé par le procédé de revêtement