Abstract: An exhaust valve for an internal combustion engine comprises a movable spindle with a valve disc which on its upper surface has an annular seat area of a material different from the base material of the valve disc. In the closed position of the valve the seat area abuts a corresponding scat area on a stationary valve member. The seat area on the upper surface of the valve disc is made of a material which has a yield strength (Rp0.2) of at least 1000 MPa at a temperature of approximately 20° C.

Abstract: In a clutch for coupling two shaft sections (2a, 2b) of a drive shaft, in which the shaft sections (2a, b) support an inner clutch ring (8) and an outer clutch ring (9) coplanar thereto and in which the clutch rings (8, 9) are provided with notches (19) which complement one another to bores (20) into which the hydraulically movable clutch bolts (22), fastened to a common servopiston (23), can be inserted. High operational safety and high user friendliness are achieved in that on the side of the clutch rings (8, 9) opposite the clutch bolts (22) a support ring (26) bridging their spacing (21) is arranged from which tie rods (27), supporting a locking ring (28) correlated with the clutch bolts (22), project that are arranged offset relative to the clutch bolts (22) and can be extended by a second servopiston (33). The two servopistons (23, 33) are arranged in a housing (11) connected to one shaft section (2a) and engaged from behind by the locking ring (28).

Abstract: An exhaust valve for an internal combustion engine including a movable spindle with a valve disc which on its upper surface has an annular seat are of a material different from the base material of the valve disc. In the closed position of the valve the seat area abuts a corresponding seat area on a stationary valve member. The seat area on the upper surface of the valve disc is made of a material which has a yield strength of at least 1000 Mpa at a temperature of approximately 20° C.

Abstract: An exhaust valve for an internal combustion engine including a movable spindle with a valve disc of a nickel-based alloy which also constitutes an annular seat area at the upper surface of the valve disc. The seat area abuts a corresponding seat area on a stationary valve member in the closed position of the valve. At manufacturing, the seat area of the valve disc is subjected to a thermo-mechanical deformation process at a temperature lower than or around the recrystallization temperature of the alloy. The seat area on the upper surface of the valve disc has been given dent mark preventing properties in the form of a yield strength of at least 1000 MPa at a temperature of approximately 20° C. by means of the thermo-mechanical deformation process and possibly a yield strength increasing heat treatment.

Abstract: A wall member is on its side facing a combustion chamber provided with a hot-corrosion-resistant material made from a particulate starting material of an alloy containing nickel and chromium which by a HIP process has been unified to a coherent material substantially without melting the starting material. In terms of percent by weight the corrosion-resistant material comprises from 38 to 75% Cr, at the most 0.15% C, at the most 1.5% Si, at the most 1.0% Mn, at the most 0.2% B, at the most 5.0% Fe, at the most 1.0% Mg, at the most 2.5% Al, at the most 2.0% Ti, at the most 8.0% Co, at the most 3.0% Nb and a balance of Ni, the aggregate contents of Al and Ti amounting at the most to 4.0%, and the aggregate contents of Fe and Co amounting at the most to 8.0%, and the aggregate contents of Ni and Co amounting at the least to 25%. The corrosion-resistant material has a hardness of less than 310 HV measured at approximately 20° C.

Abstract: An internal combustion engine of the Diesel type has an injection system with injectors which at high pressure injects compressed liquid gas into the combustion chambers of the cylinders. The liquid gas may be produced from volatile organic compounds evaporated from crude oil tanks. The engine can be a high-compression engine with a compression ration of at least 1:14, and the liquid gas can have a methane number of less than 10.

Abstract: A cylinder member for an internal combustion engine such as a valve, piston, cylinder liner or seat portion. The member has a welded high temperature corrosion resistant facing alloy with a hardness increased by use of a precipitation hardening mechanism based on a solid state phase transformation. The facing alloy has a temperature of activation of the precipitation hardening mechanism that is above the operating temperature of the alloy. The participation hardening mechanism acts so slowly that the alloy has not hardened at welding on the cylinder member Hardening occurs during a subsequent heat treatment at a temperature higher than the activation temperature for the participation hardening mechanism.

Abstract: A multi-engine plant with a common freshwater cooling system comprises turbocharged diesel engines (1) which in their coolant system are provided with a charging air cooler 911), a high-temperature circuit (HT) and a low-temperature circuit (LT). The high-temperature circuit (4) contains a fist three-way circuit delivery pipe (7) to the engine with coolant. The low-temperature circuit (5) contains a second three-way valve (13) supplying coolant to the delivery pipe (14) of the charging air cooler in the LT circuit. The charging air cooler (11) is a two-step cooler in which the first step (10) is part of the HT circuit and the second step (19) is part o the LT circuit. A control valve (16) can adjust the coolant flow through the second step in dependency of the engine load. The discharge pipe (15) from the control valve is connected to the second three-way valve and a common return pipe (3).

Abstract: In an oil supply device for a machine having different categories of oil consumers, to which respectively one supply loop provided with at least one pump is provided, it is possible to achieve a simple structure and advantageous operating costs in that all supply loops can be provided with oil from a common oil tank, that at least one supply loop having a self-cleaning filter provided with an outlet for oil sludge, and that a separating device is provided, which can be charged at least with the oil sludge from each self-cleaning filter and which has a clean oil outlet terminating in the oil tank.

Abstract: A supercharged internal combustion engine (1), such as a main engine of a ship, has a compressor (9) delivering charging and scavenging air to the engine cylinders, and a cooler (12) for cooling the air from the compressor. The cooler (12) is designed to establish direct contact between the scavenging and charging air and the cooling water, preferably by pressure atomization of the water in the air. The cooler (12) has a number of consecutive atomizer sections, and a drop collecting section (33) separating drops of water from the air may be provided between at least two atomizer sections. A delivery pump (49) supplies fresh water to atomizer sections in the cooler, and at least one of the drop collecting sections of the cooler delivers fresh water to a storage tank (50), which tank is pressured to substantially the same pressure as the air pressure in the cooler. The air may be cooled in plural stages (13-16), and sea water may be used for cooling and humidification of the air in the first stage.

Abstract: A spool valve (22) controls a hydraulic drive, such as a drive for a fuel pump (18) in an internal combustion engine, in which the hydraulic drive comprises a driving piston (34) journalled in a hydraulic cylinder (33) which through a flow passage (31) is in communication with the spool valve. The spool (38) may occupy a position in which the flow passage is connected with a high-pressure source (29) and another position in which the flow passage is connected with a low-pressure port (30). The spool is settable by means of a positioning means (23) electrically activated by a control unit (16) which determines intended positions of the spool and for a movable part (56) in the positioning member. The movable part has windings (51) positioned in a magnetic field in a slit (60) which is oblong in the longitudinal direction of the spool. A sensor (66) signalizes the actual position of the movable part to the control unit (16).

Abstract: A diesel engine can by high-pressure injection be supplied with both fuel oil and fuel gas. Each combustion in the cylinders of the engine is initiated by injection of fuel oil, and gas can be injected after initiation of the combustion. The gas share of the total fuel amount per combustion is adjustable, and the gas injection is prevented by a safety device in case of failing injection of fuel oil. When the share of gas of the total amount of fuel at a certain engine load is changed, the starting time for injection of fuel gas in relation to the starting time for injection of fuel oil is varied so that the gas injection is delayed when the gas share of the total amount of fuel is smaller, and vice versa.

Abstract: Exhaust gas in a supercharged internal combustion engine is recycled from the high pressure side of the turbocharger to the charging air system of the engine. At least part of the recycled exhaust gas is humidified to largely 100 percent relative humidity. This on one hand cools the gas to that the temperature at initiation of the combustion in the engine cylinders is lowered, and on the other hand the heat capacity of the steam in the gas restricts the temperature raise occurring during the combustion. These factors both act to reduce the amount of NO.sub.x produced by the combustion. The addition of water is effected by a scrubber (16) which purifies the recycled gas. A blower (17) augments the pressure of the recycled gas. The scrubber may be made to generate fresh water by designing it with several stages where sea water is supplied to the first stage and fresh water to the last stage.

Abstract: An internal combustion engine (1) has hydraulically driven exhaust valves (13) and fuel pumps (18). The hydraulic drives are controlled by means of a computer (16) and electrically activated positioning means (64) setting a spool in a spool valve. If the electronic control of the engine fails, the spool movement may be controlled by a first piston (41) on which the pressure in a hydraulic hose or conduit (48) acts, said conduit extending to a second piston (44) which may follow a cam (26) on a rotating camshaft. The hydraulically driven cylinder members (13, 14, 18) associated with each of the engine cylinders are mounted at the pertaining cylinder, whereas the camshaft (23) independently of the positioning of the cylinder members is disposed at an appropriate shaft drive, such as the crankshaft (11). The cam shaft has a very short length and small mass and may for instance be disposed at one end of the engine.

Abstract: The engine plant comprises a plurality of turbocharged combustion engines (1, 2), the charging air systems of which are interconnected by means of a closeable conduit (14). Conduit (14) is adapted to supply supplementary charging air from the charging air system of a loaded engine (1) to the charging air system of an unloaded engine (2). A stop valve (15) is provided in the conduit and is controlled in dependence on the working condition of the associated engine (2) on the basis of a comparison between the charging air pressure and the exhaust gas pressure. Said comparison of pressures is effected by means of a surveillance unit (18) accommodating a duct system with two separate branches connected with the charging air system and the exhaust gas system, respectively. The branches are connected with a common outlet and a thermosensor is provided in either branch.