Abstract:
Distribution valves and cylinder heads for endothermic engines having non-conventional geometric shapes can be obtained by means of application of additive manufacturing techniques. The use of a non-conventional geometry, in specific terms different from the conventional cylindrical geometry, allows the production of filling coefficients of the combustion chamber which are substantially greater and which become evident in terms of improvements in power which can be developed for the same cylinder capacity with respect to an endothermic engine with conventional valves.
Abstract:
A valve for use in an internal combustion engine (100) is provided. The valve includes a valve head. The valve head (138) includes a combustion face (140) configured to face a combustion chamber (110) of the internal combustion engine (100). The combustion face (140) includes an angular side portion (152). The combustion face (140) also includes a central recess portion (144) defining an inner diameter (Di) and an outer diameter (Do). The inner diameter (Di) and the outer diameter (Do) together define a depth (DR) of the central recess portion (144). The valve also includes a neck portion (166) configured to connect the valve head (138) with a valve stem (168) of the valve.
Abstract:
Es betrifft eine Ventilbetätigungseinrichtung (4) zur variablen Ventilsteuerung, wobei zumindest ein Anlenkpunkt (16, 18) zwischen dem Ventilhebel (9) und dem Gaswechselventil (2, 3) oder einem auf das Gaswechselventil (2, 3) wirkenden Kraft-übertragungselement über eine Versteileinrichtung verstellbar ausgebildet ist. Um eine stoßfreie Ventilbetätigung zu ermöglichen, wird vorgeschlagen, dass die Versteileinrichtung einen im Ventilhebel (9) verschiebbar gelagerten Kolben (13) aufweist, welcher an einen Druckraum (19, 20) grenzt, wobei eine mit dem Kolben (13) verbundene Kolbenstange (15) in einem ersten Anlenkpunkt (16) mit einem ersten Ende einer Schubstange (17) gelenkig verbunden ist, deren zweites Ende in einem zweiten Anlenkpunkt (18) mit dem Gaswechselventil (2, 3) oder dem auf das Gaswechselventil (2, 3) einwirkenden Kraftübertragungsteil gelenkig verbunden ist, so dass der erste Anlenkpunkt (16) in Längsrichtung der Kolbenstange (15) zumindest zwischen einer ersten Stellung und einer zweiten Stellung verschiebbar ist.
Abstract:
An engine has a rotatable crankshaft. A compression piston is received within a compression cylinder and operatively connected to the crankshaft such that the compression piston reciprocates through an intake stroke and a compression stroke during a single rotation of the crankshaft. An expansion piston is received within an expansion cylinder and operatively connected to the crankshaft such that the expansion piston reciprocates through an expansion stroke and an exhaust stroke during a single rotation of the crankshaft. A crossover passage interconnects the compression and expansion cylinders. The crossover passage includes a crossover compression valve and a crossover expansion valve defining a pressure chamber therebetween. A fuel injector is disposed in the pressure chamber of the crossover passage. Fuel injection from the fuel injector into the crossover passage is timed to occur entirely during the compression stroke of the compression piston.
Abstract:
This invention relates to a valve arrangement in a combustion engine for controlling inlet and outlet of gas mixtures, comprising a valve (1) slidably arranged within a housing (2) in a cylinder head (3) of the combustion engine, said valve (1) including a valve plate (10) and a stem like portion (IA, IB), said stem like portion (IA, IB) having an upper portion (IB) fixedly attached with its lower end to, a lower portion (IA), said lower portion (IA) having said valve plate (10) attached thereto which valve plate interacts with a valve seat (30) to allow for outlet and inlet of gases respectively, a valve control mechanism (5, 6) to control the movement and/or position of said valve (1), wherein said upper portion (IB) forms a hollow annular body (19) extending coaxially with the extension of said stem like portion to allow for said gases to be transported through the valve (1) in a channel within and formed in said annular body (19), the valve plate (10) is connected to the lower portion (IA) to form a gap between the valve plate (10) and the upper portion (IB) to allow for said gases to be transported past the valve plate into or out from the inside (190) of said hollow annular body (19), wherein the upper end (18) of said annular body (19) is open and said hollow annular body (19) at its outer side (191) is arranged with at least one first interacting device (14, 15) arranged to interact with at least one second interacting device (53, 54) of the valve control mechanism (5, 6) to facilitate said movement and positioning.