Abstract:
Die Erfindung betrifft einen Kraftstoffinjektor (10), mit einem einen Hochdruckraum (34) ausbildenden Düsenkörper (14), in dem eine Düsennadel (36) zwischen einer abgesenkten Position und einer angehobenen Position entlang einer Düsenmittelachse (18)hubbeweglich angeordnet ist, mit wenigstens einer im Düsenkörper (14) ausgebildeten, eine Längsachse (22) aufweisenden Einspritzöffnung (20), mit einer im Düsenkörper (14) ausgebildeten kegelförmigen Ventildichtfläche (32), die in der abgesenkten Position der Düsennadel (36) zum zumindest mittelbaren Verschließen der wenigstens einen Einspritzöffnung (20) mit einem an der Düsennadel (36) ausgebildeten kegelförmigen Bereich (42) zusammenwirkt und einen Dichtsitz (40) ausbildet, wobei in der angehobenen Position der Düsennadel (36) ein Strömungsweg zum Einspritzen von Kraftstoff durch aus dem Hochdruckraum (34) des Düsenkörpers (12) über einen zwischen der Ventildichtfläche (32) und dem kegelförmigen Bereich (42) ausgebildeten Durchflussspalt (60) in Richtung der wenigstens einen Einspritzöffnung (20) ausbildbar ist, wobei der der wenigstens einen Einspritzöffnung (20) zugewandte axiale Endbereich der Düsennadel (36) einen zylindrischer Bereich (54) mit einer Stirnfläche (56) aufweist, und wobei in der abgesenkten Position der Düsennadel (36) die Stirnfläche (56) der Düsennadel (36) unterhalb eines Schnittpunkts (58) zwischen der Düsenmittelachse (18) der Düsennadel (36) und der Längsachse (22) der wenigstens einen Einspritzöffnung (20) angeordnet ist.
Abstract:
The invention relates to an engine building, namely to fuel supplying equipment of combustion engines. The aim of the invention is the improvement of fuel injection quality and significant simplification of nozzle construction, improvement of nozzle operation longevity. The set problem is solved by that fuel is fed as continuous hollow cone with a spraying angle of more than 50º through a circular slot formed by valve conic surface and a conic saddle in a body. Theset problem is solved as well by that valve is made as a disc valve, with plate flank addressed to engine cylinder, and conic mounting surface addressed to sprayer body saddle, the spraying hole is made as ring slot between sprayer body saddle and plate conic surface of the valve appearing at valve opening due to elastic deformation of the valve stem, from the opposite side of valve plate the tool for preliminary rod elastic tightness making is installed. There are also other differences from the prototype. The advantage of claimed technique and device is the absence of transferred material masses, and therefore, inertial resistances, that allows to work on high-speed and high-revolution engines. Besides, this technique is easily falling under automated control, according to quantity and quality of fed fuel. The construction of a nozzle is substantially simplified.
Abstract:
The invention relates to a fuel injector for an internal combustion engine, with an injector body (10); an injector needle (12), which is displaceable within the injector body, between a closed position against a sealing seat (16) and an open position where said injector needle is lifted away from the sealing seat (16), in the direction of the combustion chamber; a pressure chamber (24), which is connected to a fuel inlet (26); a control chamber (42), which is controlled by a control valve (46) and is connected to the fuel inlet and a plunger rod (40), which is connected to the valve needle and extends into the control chamber. The aim of the invention is to reliably generate a closing force, which is greater than an opening force produced in the region of the sealing seat. Said aim is achieved, whereby the plunger rod is provided with a return piston (28), which closes the control chamber (24) off from the side towards the sealing seat. The diameter of said piston is greater than the diameter of the sealing seat (16) and the surface, which is a product of the difference between the cross-sectional area of the return piston (28) and the surface enclosed by the sealing seat, is less than the cross-sectional area of the plunger rod.
Abstract:
Disclosed is an injector nozzle through which fluid is delivered and which has a port (17) having an internal surface and a valve member (13) having a complementary external surface. The valve member (13) is movable relative to the port (17) to respectively provide a passage between the internal and external surfaces for delivery of fluid in the form of a spray. Alternatively, sealed contact of the surfaces will prevent the delivery of fluid. The nozzle includes a flow control body (30) located beyond an extremity of the port (17). The flow control body (30) has a control surface (33) arranged downstream of the port (17) in the direction of movement of the valve member (13). The control surface (33) is configured and positioned to promote the fluid spray established by the fluid issuing from the port (17) to in part follow a path determined by the shape of the control surface (33). The flow control body (30) includes an insulating region (140, 141) arranged to restrict heat transfer from the control surface (33) to the nozzle. The insulating region (140, 141) may be the spacing between the surface (30a) of the flow control body (30) closest to an end face (14a) of the valve member (13) and that end face (14a).
Abstract:
The invention relates to a fuel injection valve comprising a valve body (1, 80), in which a plunger-shaped valve element (5, 100) is arranged that axially moves counter a closing force inside a boring (2, 90). Said valve element controls, on the end located on the side of the combustion chamber, at least one injection opening (13a, 13b, 92) by means of an opening lifting movement. During the opening lifting movement, the valve element (5, 100) comes to rest on a face of a control plunger (30) that surrounds said valve element (5, 100), said face being configured as a lift stopping face (42). The control plunger (30) delimits, with the stepped face (35) thereof, a control space (33) that can be filled with fuel. When a defined fuel pressure in the control space (33) is reached, the control plunger (30) moves toward the spring space (20, 105) from a first lifting position into a second lifting position, thus limiting the opening lifting movement of the valve element (5, 100) to a partial lift. One part of the control plunger (30) is configured as a piezo actuator (26) whose axial extension is altered by the flow of current, whereby the partial lift of the valve element (5, 100) can be continuously adjusted in the first lifting position of the control plunger (30) within the lift of the piezo actuator (26).
Abstract:
A fuel injection nozzle of the pintle type has a projection (21) formed on the valve member (19). The projection has a cylindrical portion (28) which forms a small working clearance with the wall of an outlet opening (18). The cylindrical portion is followed by a tapered portion (30) and formed on the cylindrical portion and the adjacent part of the tapered portion is a notch (33) which when the valve member starts to move to the open position allows fuel to flow to the engine. The flow of fuel along the notch ceases as further movement takes place and the fuel flow is then controlled by the tapered portion of the projection.
Abstract:
The present disclosure relates to a method of modifying a conventional injector (e.g., a high pressure direct fuel injector) and to the modified injector resulting therefrom. The modified injector provides a fluid flow rate and/or fluid spray plume (i.e., pattern) which is different than the fluid flow rate and/or fluid spray plume (i.e., pattern) of the original conventional injector. In one embodiment, provided is a modified injector used in internal combustion engines for fuel delivery directly into the combustion chamber.
Abstract:
The present disclosure refers to a nozzle needle (34) configured to move within a fuel injector having an injector body (14), the nozzle needle (34) being formed as a unitary member from a ceramic material and comprising a first cylindrical part (36) with an axis and a cylindrical extension having the same axis, the first cylindrical part (36) being formed with a convex abutment surface (38) at or proximal to a terminal end, the abutment surface being adapted to sealingly abut on a valve seat surface (28) formed on the injector body (14); and the cylindrical extension (40) projecting from the abutment surface and having a diameter smaller than a diameter of the first cylindrical part.
Abstract:
L'injecteur de carburant pour moteur à combustion interne comporte : un corps d'injecteur (12) formant notamment une buse (14) terminée par un orifice d'injection (23); des moyens d'obturation de l'orifice d'injection (23) comportant un ensemble (28) portant une tige vibrante (23) terminée par une tête d'obturation (26) de l'orifice d'injection (23); des moyens de mise en vibration de la tige (24) et/ou de la buse (14) de manière à alternativement ouvrir et fermer l'orifice d'injection (23) et; des moyens de rappel (30) des moyens d'obturation en position d'obturation de l'orifice d'injection (23), qui coopèrent avec l'ensemble (28) portant la tige (24), et; des moyens de blocage de l'ensemble (28) portant la tige (24) par rapport au corps de l'injecteur (12) qui sont sélectivement activables en fonction de la vitesse de déplacement de l'ensemble (28) portant la tige (24).