Abstract:
The cooling arrangement for a valve seat of a piston engine comprises a cylinder head (1) comprising an inlet duct (8) and an outlet duct (9) for cooling liquid and a valve seat insert (2), which comprises a cooling duct (10), an inlet port (11) that is arranged on the outer circumference of the seat insert (2) and in fluid communication with the inlet duct (8) of the cylinder head (1) for conveying cooling liquid into the cooling duct (10), and an outlet port (12) that is arranged on the outer circumference of the seat insert (2) and in fluid communication with the outlet duct (9) of the cylinder head (1) for discharging cooling liquid out of the cooling duct (10). At least one connecting pipe (3) is arranged together with a seal (6) against the seat insert (2) and inside the inlet duct (8) or the out- let duct (9) of the cylinder head (1).
Abstract:
Bei einer Ventilanordnung mit einem einem Gaskanal (8) zugeordneten, einen Ventilteller (6) und einen diesen tragenden Ventilschaft (7) aufweisenden, mit einer Kühleinrichtung versehenen Ventil (4) lassen sich dadurch eine einfach Bauweise sowie eine hohe Funktionssicherheit und gute Energiebilanz erreichen, dass ein gasförmiges oder zumindest teilweise aus in einen gasförmigen Zustand überführbaren Komponenten bestehendes Kühlmedium Verwendung findet, das als Gas über wenigstens eine Fortlasskammer (17) in einen Gaskanal (8) entsorgt wird, wozu jede von der Fortlasskammer (17) abgehende Entsorgungsleitung (19) in einen Gaskanal (8) mündet.
Abstract:
An internal combustion engine can be operated in an efficiency mode to provide a first power output range between zero and a transition power output level and in a power mode to provide a second power output range between the transition power output level and a maximum power output level. A first ignition timing and a first air/fuel ratio of the mixture can be used in the efficiency mode to avoid premature auto-ignition of a mixture of inlet air and a fuel according to an octane rating of the fuel and a compression ratio exceeding approximately 13:1. A second ignition timing and a second air/fuel ratio of the mixture can be used in the power mode to avoid premature auto-ignition of the mixture according to the octane rating of the fuel and the compression ratio exceeding approximately 13: 1. To further enable knock free operation of such an engine, turbulence can be imparted to the mixture to promote a faster burn duration and high temperatures that may lead to premature auto-ignition of the mixture can be avoided.
Abstract:
The invention relates to an engine, such as a two-stroke large diesel engine, comprising two parts (1, 7) that fit together, whereby a cooling channel (12) into which coolant can be introduced, sealing devices which close said cooling channel and which are offset in an axial direction, and supporting surfaces (9, 10) which absorb counter supporting forces are provided in the area of the juncture between the parts (1, 7) that fit together. Indication boreholes (19) which are provided for indicating a leakage and which terminate on an outer surface are assigned to said supporting surfaces. The inventive engine is characterized in that coolant is reliably prevented from seeping out or combustion gases are reliably prevented from leaking. To these ends, a sealing device assigned to the cooling channel is designed as a circular flat sealing ring (17) which is placed between the supporting surfaces (9, 10). A circular channel system (18) which interconnects the lateral flanks of the flat sealing ring that are located on the side of the supporting surfaces is assigned to said ring, and the indication boreholes (19) communicate with the channel system.
Abstract:
An internal combustion engine (10) includes at least one cylinder (12) having a piston, and a cylinder head containing an inlet duct (3) incorporating an inlet valve 1 to allow flow in only one direction and an exhaust duct incorporating no mechanical flow restricting device and at least one chamber valve (2) through which both inlet and exhaust fluids pass from the ducts (3,4) into and out of the cylinder (12), and a combustion chamber (6) in the cylinder (12) that allows the chamber valve (2) to be significantly open when the piston (5) is at top dead centre enabling a transfer of fluid, fluid flow pressure and pressure waves between the cylinder, and the inlet (3) and exhaust ducts (4).
Abstract:
An internal combustion engine, wherein a combustion chamber and a heat insulating layer are provided in a cylinder head on one side and the other side across a partition wall, respectively, a cooling line is provided in the partition wall in a plurality of areas where heat loads are different from each other, and the flow rate of cooling medium is set so as to be higher in the cooling line located in the area where heat load is large than in the cooling line located in the area where heat load is small, whereby an increased temperature of exhaust gases can be achieved by holding the combustion chamber at a high temperature.
Abstract:
The invention relates to a valve assembly, comprising a valve (4) which is associated with a gas conduit (8), has a valve disc (6) and a valve stem (7) supporting said valve disc and is provided with a cooling device. In said valve assembly, a simple design, high functional reliability and a good energy balance can be achieved by using a gaseous cooling medium or a cooling medium which consists at least partially of components that can be converted into a gaseous state. The cooling medium is discharged as gas into a gas conduit (8) via at least one outlet chamber (17), and for this purpose each discharge duct (19) originating from the outlet chamber (17) opens into a gas conduit (8).
Abstract:
Ein Gaswechselventil eines Verbrennungsmotors mit einem hohlen Ventilteller (2) sowie einem den Hohlraum (5) des Ventiltellers (2) in dessen Achse vollständig durchdringenden hohlen Ventilschaft (4), bei dem die Hohlräume (5;6) des Ventiltellers (2) und des Ventilschaftes (4) mit einer vorbestimmten Menge an Kühlmedium teilweise ausgefüllt sind, soll bei rationeller Herstellbarkeit getrennte Kühlhohlräume (5;6) in dem Ventilteller (2) und dem Ventilschaft (4) aufweisen. Zu diesem Zweck zeichnet sich ein solches Gaswechselventil durch folgende Merkmale aus, zum Befüllen des Hohlraumes (5) des Ventiltellers (2) ist in dem dem Brennraum des Verbrennungsmotors zugewandten Boden des Ventiltellers (2) eine Ventilteller-Einfüllöffnung (7) vorgesehen, mit der Ventilteller-Einfüllöffnung (7) steht die Ventilschaft-Einfüllöffnung bei noch nicht angebrachtem Verschlussstück (10) für ein voneinander getrenntes Befüllen durch die Ventilteller-Einfüllöffnung (7) hindurch in Verbindung.