Abstract:
A poppet valve (13) has a valve body (14) and a closure member or valve stem (17) disposed in a bore (23) in the valve body. The interior of the valve body is hollow, and is closed at one end. When the valve is open, fluid passes into the interior of the closure member (17) through apertures (22) and passes along the interior of the closure member. The valve (13) can be located in the cylinder head of a marine propulsion unit to act as a purge port (9) of a post-immersion restart system.
Abstract:
The present invention relates to a reciprocating internal combustion engine with a high fuel efficiency and a low level of emissions. This is achieved by structural measures that improve the combustion process, including but not limited to the incorporation of an impeller or other fluid mixing device inside the combustion chamber and the use of annular intake and/or exhaust valves.
Abstract:
Multi-cylinder internal combustion engine using exhaust gases to increase cylinder filling comprises cylinders (10) with pistons (2), a head (1) with lifting valves (7) and a crankshaft mechanism (3) and is provided with two cylinders (10) with mutually shifted four-stroke cycle and/or is provided with three cylinders (10) with mutually shifted four-stroke cycle and in the head (1) of each cylinder (10) there is at least one intake port (5) interconnected with at least one exhaust port (6) and at least one lifting valve (7), while the intake port (5) is provided with at least one valve (8) and an exhaust branch (9) is connected to the exhaust port (6) and simultaneously exhaust branches (9) of two cylinders (10) with mutually shifted cycle are farther joined in a joint (11) into one cross-section and/or exhaust branches (9) of three cylinders (10) with mutually shifted cycle are farther joined in another joint into one cross-section.
Abstract:
Die Erfindung betrifft einen Verbrennungsmotor, insbesondere Zweitakt-Großdieselmotor, mit wenigstens einer durch einen Zylinder (1) und einen mit einer Kurbelwelle zusammenwirkenden Kolben (3) begrenzten Brennkammer (2), welche zumindest einen jeweils zwischen einem Ventilteller (8; 108; 308) eines Auslassventils (9; 109; 309) und einem zugeordneten Tellersitz gebildeten Brenngas-Auslass (20; 120; 320; 420) und zumindest einen Ladeluft-Einlass (4) aufweist, wobei das Auslassventil (9; 109; 309) zwischen einer geöffneten Stellung und einer geschlossenen Stellung betätigbar ist. Der Brenngas-Auslass (20; 120; 320; 420) ist mit zumindest einem Auslasskanal (11 ) und mit zumindest einem Brenngasabzapfkanal (18; 118a, 118b; 318, 318a; 418, 418a) verbunden, beispielsweise um einen Teil eines bei der Verbrennung entstehenden Brenngases zum Ladeluft-Einlass (4) zurückzuführen. Die Erfindung betrifft ferner ein Auslassventil (9; 109; 309) und einen Zylinderkopf für einen solchen Verbrennungsmotor. Die Erfindung zeichnet sich durch eine an dem Auslassventil (9; 109; 309) befestigte oder einstückig mit dem Auslassventil (9; 109; 309) ausgeformte Drosseleinrichtung (10; 110; 310) aus, über welche das Brenngasabzapfen auf eine bestimmte Weise bewerkstelligt wird. Die Erfindung betrifft ferner ein Herstellungsverfahren für einen Verbrennungsmotor, ein Verfahren zum Betrieb eines Verbrennungsmotors und eine Verwendung für einen Verbrennungsmotor.
Abstract:
Methods and apparatus to selectively use engine valves (24) as both intake and exhaust valves and to selectively operate the engine as a 2 cycle or as a 4 cycle engine. In a disclosed embodiment, the intake valves and the exhaust valves are manifolded together through a small manifold, with the manifold being connectable to the intake manifold or the exhaust manifold through two-way valves (26, 28). In preferably a camless engine, the engine valves may be controlled to operate the intake valves as intake valves only or to operate as both intake valves and exhaust valves, and to operate the exhaust valves as exhaust valves only or to operate the exhaust valves as both intake valves and exhaust valves. Exemplary embodiments are disclosed.
Abstract:
The invention concerns a four stroke engine with a unique valve on the cylinder, for which the admission flux respectively the evacuation flux separation is made by butterfly valves. In conformity with the invention the engine is equipped with a cylinder (1) that has a valve (2) unique, bivalent, where the flux separation is made by a butterfly valve (6) for the evacuation and, depending on the kindling type, diesel engine or petrol engine, the volume of the combustion chamber (24) is different, the cylinder head (1) being equipped with an injector (41) or with a sparking plug (42), laterally mounted.
Abstract:
Direct injection engine with one valve per cylinder has electronically (programmed) controlled opening and closing of valves, in contrast to up to now known engine with distribution system and completely mechanical control. Injection of the air or the mixture respectively during the suction stroke, performed so far by means of under pressure generated by the piston on its way to the outer dead center, is replaced by the computer regulated air and fuel supply under pressure. The air injection during the exhaust stroke causes: - additional cooling of the cylinder which, owing to the reduced friction, reduces fuel consumption and increases the power of the engine; - additional improvement of cylinder scavenging reduces the amount of harmful and poisonous elements in exhaust gases.
Abstract:
An intake and exhaust valve system (10) for an internal combustion engine having a combustion chamber (19) within a cylinder (13) closed at one end by a cylinder head (17). A cavity (25) is provided in the cylinder head opening onto the combustion chamber through a first port (27). The valve system (10) has first and second valves one of which is an intake valve (31) movable between open and closed conditions for controlling intake fluid flow into the combustion chamber (19) and the other of which is an exhaust valve (33) movable between open and closed conditions for controlling exhaust gas flow from the combustion chamber. The first valve (31) comprises a valve head (35) sealingly engagable with the first port (27) and a skirt structure (37). The skirt structure (37) is in sliding and sealing engagement with a tubular wall structure (49) within the cavity (25) whereby the skirt structure and wall structures cooperate to divide the cavity (25) into an inner cavity section (51) and an outer cavity section (53) surrounding the inner cavity section. A first flow passage (26) communicates with the outer cavity section (53) and a second flow passage (28) communicating with the inner cavity section (51). The second valve (33) is disposed in the first valve (31) for opening and closing a second port (61) in the first valve (31) for controlling fluid flow between the combustion chamber (19) and inner cavity section (51) wherein the skirt structure (37) has a first axial length and the tubular wall structure (49) has a second axial length with the first axial length being less than the second axial length. This arrangement provides a concentric intake and exhaust valve system with reduced reciprocating mass.
Abstract:
A fuel injection system includes a hydraulically-actuated electronically-controlled fuel injector (45) having a needle valve member (55) and an injector body (50) that defines a fuel pressurization chamber (75) that opens to a nozzle outlet (80). The needle valve member (55) is positioned in the injector body (50) and is moveable between an inject position at which the nozzle outlet (80) is open, and a blocked position at which the nozzle outlet (80) is blocked. A portion of the injector body (50) adjacent the nozzle outlet (80) is a mono gas valve member (51). The movement of the gas valve member (51) controls one or both of the intake and exhaust portions of the engine cycle. The gas valve member (51) is also hydraulically-actuated and electronically-controlled by the same hydraulic actuator (46) that operates the fuel injector (50).
Abstract:
The present disclosure relates to a valve arrangement (200) for supplying air to a combustion chamber of an internal combustion engine, said valve arrangement comprising a first valve (206), said first valve (206) comprising a first valve head (208), a first valve stem (212) and an internal cavity (224), which is partly located in the first valve stem (212) and open towards a lower surface of the first valve head (208), a valve guide (214) arranged to surround a portion of said first valve stem (212) such that said first valve stem (212) is movable in said valve guide (214) along a longitudinal direction between an upper, closed position of the valve, and a lower, open position, in which open position air may be supplied to the combustion chamber past the first valve head (208), said valve guide (214) comprising an air passage (242) allowing supply of additional air to said combustion chamber via the internal cavity (224) in said first valve (206), when said first valve (206) is in its closed position. The valve arrangement (200) comprises a guide leakage preventing means (300´, 300'') for preventing liquid from leaking from a region (301) externally of said first valve stem (212) to said valve guide air passage (242).