Abstract: An electromagnetic fuel injection valve wherein a central pipe part has satisfactory mechanical strength and an intermediate portion of the pipe part is surely made non-magnetic is provided. The electromagnetic fuel injection valve has a core surrounded by a solenoid coil. A valve housing is disposed forward of the core. The core and the valve housing are connected through a thin-walled portion. The wall thickness of the thin-walled portion is smaller than the wall thickness of the core and that of the valve housing. The core and the thin-walled portion, together with the valve housing, are formed in an integral structure. The thin-walled portion has a sufficient wall thickness to provide satisfactory mechanical strength. The thin-walled portion is modified into a high-hardness non-magnetic portion by a carbulizing treatment.

Abstract: A fuel injection valve for internal combustion engines, having a valve body that tapers toward the combustion chamber, forming an annular heel, and merges with a valve shaft protruding as far as the inside of the combustion chamber. The fuel injection valve is disposed in a receiving bore, and the diameter of the receiving bore decreases toward the combustion chamber, forming a stop face. In the installed position, the annular heel is pressed against the stop face with the interposition of a sealing disk, and on the side toward the valve retaining body, the sealing disk has an annular rib encompassing it or interrupted at at least one point, and this annular rib surrounds the annular heel and engages an undercut, formed on the outside jacket face of the annular heel, and is thereby joined in captive fashion to the valve body.

Abstract: A fuel injector for an internal combustion engine is disclosed. The fuel injector includes a housing, a valve seat, a metering orifice disc, and a needle. The housing has an inlet, an outlet, and a longitudinal axis extending therethrough. The valve seat is disposed proximate the outlet and includes a passage having a sealing surface and an orifice. The metering orifice disc is located at the outlet and has a plurality of metering openings extending therethrough. The needle is reciprocally located within the housing along the longitudinal axis between a first position wherein the needle is displaced from the valve seat, allowing fuel flow past the needle, and a second position wherein the needle is biased against the valve seat, precluding fuel flow past the needle. A generally annular channel is formed between the valve seat and the metering orifice disc. The channel tapers outwardly from a large height to a smaller height toward the orifice openings.

Abstract: A fuel injector, in particular for direct injection of fuel into a combustion chamber of an internal combustion engine, having an actuator for actuating a valve needle, the valve needle having on one injection end a valve-closure member which forms a sealing seat together with a valve-seat surface formed on a valve-seat member. Fuel channels are provided in a valve needle guide which is designed in one piece with or is connected to the valve-seat member and they open into a swirl chamber. The number of fuel channels is such that a turbulent flow produced in the swirl chamber is homogeneous in a circumferential direction.

Abstract: A fuel injector, especially for the direct injection of fuel into the combustion chamber of a mixture-compressing internal combustion engine having externally supplied ignition, comprising a swirl disk having swirl channels and a central recess, and having a guide compensator inserted into the recess whose center axis is able to be inclined relative to the center axis of the fuel injector and which has a sealing fit with respect to the valve needle. Formed by a sealing-seat surface, disposed in the swirl disk, and a radial widening of the guide compensator is a sealing seat which tolerates an excursion of the center axis, preventing a swirl-free leakage flow in the same manner as the sealing fit between the valve needle and the guide compensator.

Abstract: A thin film coating for a low alloy steel or tool steel components in a fuel injector (14), such as a fuel injector needle valve (86) is disclosed. A thin film coating (96) consists of a metal carbon material layer less than 2.0 microns thick applied to a low alloy steel substrate (95) or tool steel substrate (95) used in fuel injector components, such as the fuel injector needle valve (86) or a portion thereof. Optionally, a thin bond layer (98) of chromium is deposited between the steel substrate (95) and the primary metal carbon material coating (96). The thin film coating (96) minimizes abrasive and adhesive wear associated with the needle valve (86) and cooperating nozzle surfaces (62, 63) of the fuel injector (14).

Abstract: A fuel injector including a body having an inlet, an outlet, and a fuel passageway extending from the inlet to the outlet along a longitudinal axis. An armature is proximate the inlet of the body. A needle is operatively connected to the armature. A seat is proximate the outlet of the body. A guide member is disposed within the body, the guide member including an aperture that guides the needle. A flat metering disk is disposed between the seat and the guide member, the flat metering disk including a central aperture, a perimeter, and a plurality of slots. Each of the plurality of slots is disposed about the central aperture and extends from the central aperture toward the perimeter to define a volume. The plurality of slots are configured so that the volumes of two of the plurality of slots are non-uniform, and/or the plurality of slots are non-uniformly disposed about the central aperture.

Abstract: The invention relates to a common rail fuel injector having an injector housing with a fuel inlet in communication with a central high-pressure fuel reservoir outside the injector housing and with a pressure chamber inside the injector housing. A control valve assures that a nozzle needle lifts from a seat when the pressure in the pressure chamber is greater than the pressure in a control chamber that communicates with the fuel inlet via an inlet throttle. The control chamber is defined by a bush that is displaceable, causing a sealing action, on the end of the nozzle needle remote from the combustion chamber and that is kept in contact against the injector housing with the aid of the nozzle spring.

Abstract: A fuel injector includes a valve body and a valve seat positioned at a lower end of the valve body. A needle assembly is positioned within an inner bore of the valve body, the needle assembly including a needle body and an armature connected to an upper end of the needle body. A pair of guides are integrally formed with the valve body for guiding the needle assembly. The pair of guides includes an upper guide and a lower guide; the upper guide guiding the armature and the lower guide guiding the needle body.

Abstract: A fuel injector, in particular an injector for fuel injection systems of internal combustion engines, has a first actuator which cooperates with a first valve needle. A first valve closing body situated on the first valve needle cooperates with a first valve seat surface to form a first sealing seat. A second actuator cooperates with a second valve needle, and a valve-closing body situated on the second valve needle cooperates with a second valve seat surface to form a second sealing seat.

Abstract: A fuel injector for fuel injection systems of internal combustion engines has a valve-closure member (4) that is in working engagement with a valve needle (3) and that coacts with a valve-seat surface (6), positioned in an orifice of a valve-seat member (5), to form a sealing seat; and has at least one spray discharge opening (7) positioned in the valve-seat member (5). Between the valve-seat surface (6) and the spray discharge opening (7), a second surface (36) that encloses with the center axis (37) of the fuel injector (1) a more acute angle (&bgr;) than the valve-seat surface (6) is formed by the orifice of the valve-seat member (5). A closure element extension (35), whose enveloping surface (39) forms an obtuse angle with the contiguous contour of the valve-closure member (4), is positioned at the downstream end of the valve-closure member (4).

Abstract: An injector for injecting fuel into the combustion chamber of an internal combustion engine includes an injector housing, in which a pressure chamber surrounds an insert part. The pressure chamber can be filled with fuel at high pressure via a high-pressure inlet. Via the pressure chamber, a control chamber defined by the insert part and a valve component is subjected to pressure. The valve component is movable inside the insert part, thus executing a stroke motion. A one-piece, metal sealing element is received by a nonpositive connection on the circumference of the insert part is subjected to the high pressure prevailing in the pressure chamber.

Abstract: A fuel injector (1) for fuel-injection systems of internal combustion engines has a solenoid coil (10); a valve needle (3) that is operatively connected to the solenoid coil (10) and acted upon by a restoring spring (23) in a closing direction, in order to actuate a valve-closure member (4) which, together with a valve-seat surface (6) formed at a valve-seat member (5), forms a sealing seat; and at least two spray-discharge orifices (7) which are formed in the valve-seat member (5). The spray-discharge orifices (7) are formed in the valve-seat member (5) in such a way that they are shielded from mixture flows circulating in a combustion chamber of the internal combustion engine.

Abstract: A fuel-injection nozzle for an internal combustion engine is disclosed. The nozzle comprises a nozzle body (2), in which a nozzle needle (10) with a stop (34) is positioned so that it can be displaced, and a nozzle holder (6), in which a pressure pin (16) is displaceably mounted. A disc-shaped stop element (26) is provided in a zone between the nozzle body (2) and the nozzle holder (6). The nozzle body (2) and the nozzle holder (6) are axially braced against one another in such a way that the stop element (26) forms a first sealing surface (30), which lies adjacent to one section (23) of the nozzle holder and a second sealing surface (31), which lies adjacent to one section (24) of the nozzle body. Both the first and second sealing surfaces (30, 31) respectively have at least one cavity (36), which is punched, drilled and/or stamped.

Abstract: It is an object of the invention to provide a method of working an injection hole of an electromagnetic type fuel injection valve so that when extrusion by using a punch is adopted, the punch does not break, even in the case where a central axis line of the injection hole of the electromagnetic type fuel injection valve is inclined to a line perpendicular to a face of a plate-like material to be punched. A front end, tapered portion of the punch is inclined in a direction opposed to a plate-like material relative to a central axis line of the punch to facilitate the punch along a sliding, inner face of a punch holder. While achieving a reduction in production cost, the divergent-shaped injection hole can accurately be formed in the plate-like material. A side force (Fs) is produced when the front end portion of the punch impinges on the plate-like material.

Abstract: A fuel injector that allows spray targeting and distribution of fuel to be configured using non-angled or straight orifice having an axis parallel to a longitudinal axis of the subassembly. Metering orifices are located about the longitudinal axis and defining a first virtual circle greater than a second virtual circle defined by a projection of the sealing surface onto the metering disc so that all of the metering orifices are disposed outside the second virtual circle. The projection of the sealing surface converges at a virtual apex disposed within the metering disc. At least one channel extends between a first end and second end. The first end is disposed at a first radius from the longitudinal axis and spaced at a first distance from the metering disc.

Abstract: A fuel injector that allows spray targeting and distribution of fuel to be configured using non-angled or straight orifice having an axis parallel to a longitudinal axis of a valve subassembly. Metering orifices are located about the longitudinal axis and defining a first virtual circle greater than a second virtual circle defined by a projection of the sealing surface onto the metering disc so that all of the metering orifices are disposed outside the second virtual circle. The projection of the sealing surface converges at a virtual apex disposed within the metering disc. At least one channel extends between a first end and second end. The first end is disposed at a first radius from the longitudinal axis and spaced at a first distance from the metering disc.

Abstract: Reduced thickness portions in a form of a recess are formed in a contact surface in a lower end of a tip packing, which contacts with an upper end of a nozzle body. Furthermore, reduced thickness portions in a form of a recess are formed in a contact surface in an upper end of the tip packing, which contacts with a nozzle holder. With this arrangement, a sealing surface pressure around a connection between corresponding fuel passages is increased with use of a reduced axial fastening force by reducing the sealing surface area in each contact surface. Furthermore, one of the reduced thickness portions formed in the contact surface in the upper end of the tip packing is used as a leakage recovery passage.

Abstract: A fuel injector seal for preventing the intrusion of liquid fuel into the working moving parts of a fuel injector. The seal is in the form of a flexible bellows, assembled from first, inner and second, outer caps joined together. The seal is positioned in the injector to create a liquid tight seal between the reciprocating injector jet needle and the enclosure for the remaining fuel-sensitive components of the injector.

Abstract: A fuel injector, in particular for a high-pressure injector for direct injection of fuel into a combustion chamber of an internal combustion engine, has compression of a fuel/air mixture with spark ignition. On the downstream end of the valve a valve seat element (26) is provided, to which a perforated disk (70) acting as a flow restrictor is connected downstream. A swirl element (47) is situated upstream from the valve seat (27) which imparts an atomization-promoting rotational motion to the fuel to be injected. In the valve seat element (26) downstream from the valve seat (27) an elongated outlet orifice (32) is provided which opens directly into an orifice (73) in the perforated disk (70) attached to the valve seat element (26). The width of the outlet orifice (32) is greater than the width of the orifice (73), at least at its narrowest location, so that it is possible to adjust the steady-state flow rate of the valve at the orifice (73).

Abstract: A fuel injector comprising an outer valve needle provided with a bore, an inner valve needle slidable within the bore, the outer and inner valve needles being engageable with first and second seatings respectively to control the supply of fuel from the fuel injector. The inner valve needle includes a passage which communicates with a sac chamber located downstream of the second seating, whereby movement of the outer valve needle away from the first seating causes fuel to flow through the passage into the sac chamber such that fuel pressure within the sac chamber causes the inner valve needle to lift away from the second seating.

Abstract: A fuel injection valve for internal combustion engines, having a valve body (3) in which a bore (7) is embodied. A valve seat face (10) and at least one injection opening (9) are embodied on the end toward the combustion chamber of the bore (7), and at least one injection opening (9) connects the bore (7) with the combustion chamber of the engine. A nozzle needle (12) is longitudinally displaceably guided in the bore (7) and on its end toward the combustion chamber it has a sealing face (217), which cooperates with the valve seat face (10) and thus controls the at least one injection opening (9). The nozzle needle (12) has a central longitudinal bore (19), in which an inner needle (14) is disposed that is fixed immovably relative to the valve body (3). The nozzle needle (12) is guided over at least part of its length on the inner needle (14), so that the nozzle needle (12) is kept exactly centrally in the bore (7) at all times (FIG. 1).

Abstract: A fuel injector having a fuel flow rate set by injector stroke is disclosed. The fuel injector includes a housing having a hollow passage and a seat disposed at one end of the hollow passage. A needle is slidably mounted in the hollow passage. The needle is operable between a first position wherein the needle engages the seat and a second position wherein the needle is disposed away from the seat. A first flow area is formed by a minimum frusto-conical area between the seat and the needle when the needle is disposed away from the seat. The fuel injector also includes an opening at the one end of the hollow passage proximate to the seat. The opening has a second flow area larger than the first flow area. A method for setting a gaseous fuel injector flow rate with injector stroke is also disclosed.

Abstract: A fuel injector for a fuel injection system of an internal combustion engine includes an energizable actuator having a valve closure element actuable by the actuator by a valve needle, which coacts with a valve seating surface to form a sealing fit and which is held in the closed position by a return spring. The actuator acts on the valve needle via a sleeve-shaped needle driver that is separate from the valve needle, which is arranged in an axially movable fashion with respect to the needle driver, and a collar of the needle driver is engageable behind a needle collar of the valve needle at the end facing away from the return spring.

Abstract: A high-pressure fuel system for internal combustion engines, having a housing that contains two high-pressure bodies. The high-pressure bodies rest with contact surfaces at least indirectly against each other and are pressed against each other by means of a tensioning device. A supply conduit is embodied in the high-pressure bodies, which carries highly pressurized fuel and passes through the contact surfaces of the two high-pressure bodies. A sealing film is disposed between the two high-pressure bodies, which encompasses the passage of the high-pressure conduit and thus assures a favorable seal.

Abstract: There is provided a fuel injection valve in which an operation sound at the time of an operation of the fuel injection valve is lowered, and durability of parts is improved. A flat surface 4a of a valve body 4 is provided at a lower surface side of a shoulder portion 3a provided at a needle valve 3, and when the needle valve 3 moves in a valve closing direction, a portion B in which fuel is confined is compressed at a place between a lower surface of the shoulder portion 3a and the flat surface 4a, so that a damping effect of fluid is obtained and an operation sound is lowered.

Abstract: A method of setting a distance between a first body and a second body in a fuel injector is disclosed. The method includes providing an intermediate body having a first end, a second end and a longitudinal axis, the first end being fixedly connected to the first body and the second end being fixedly connected to the second body. The intermediate body is compressed toward the longitudinal axis. The compression axially elongates the intermediate body, such that the first body is separated from the second body. An apparatus used to set the distance is also disclosed.

Abstract: A fuel injector (1), especially for the direct injection of fuel into the combustion chamber of a mixture-compressing internal combustion engine having externally supplied ignition, comprising a swirl disk (35) having swirl channels (36) and a central recess (38), and having a guide compensator (41) inserted into the recess (38) whose center axis is able to be inclined relative to the center axis of the fuel injector (1) and which has a sealing fit with respect to the valve needle (3). Formed by a sealing-seat surface (39), disposed in the swirl disk (35), and a radial widening (40) of the guide compensator (41) is a sealing seat which tolerates an excursion of the center axis, preventing a swirl-free leakage flow in the same manner as the sealing fit between the valve needle (3) and the guide compensator (41).

Abstract: A fuel injector, for example, for the direct injection of fuel into the combustion chamber of a mixture-compressing internal combustion engine with externally supplied ignition is provided, including a valve-seat member, into which grooves are introduced upstream from a valve-seat surface, and a guide disk, which cooperates with the grooves of valve-seat member to form closed swirl channels. The swirl channels discharge with a tangential component into a swirl chamber, where the inflowing fuel obtains a velocity component in the circumferential direction given an open fuel injector.

Abstract: A fuel injector, especially an injection valve for fuel injection systems of internal combustion engines, has a valve-closure member, which can be actuated by an actuator, via a valve needle, and interacts with a valve-seat surface to form a sealing seat. In this context, a valve-needle axis of the valve needle forms a preselectable tilt angle with an axis of the actuator.

Abstract: A fuel injector for fuel injection systems of internal combustion engines includes a valve needle and a valve-closure member mechanically linked to it, which cooperates with a valve-seat surface situated in a valve-seat member to form a sealing seat, and at least one swirl-producing element which is situated upstream from the sealing seat in the valve-seat member. One or more swirl channels which are open toward the upstream side of the valve-seat member are incorporated into the upstream side of the valve-seat member as a swirl-producing element.

Abstract: A fuel injector is provided. The fuel injector includes a fuel metering member having first and second ends disposed along a longitudinal axis, a seat located within the fuel metering member proximate the second end, and a needle reciprocably disposed within the fuel metering member. The needle has a longitudinal needle axis. The fuel injector also includes a guide disposed within the fuel metering member proximate to the seat. The guide includes a generally planar disk having a first surface, a second surface, and an outer perimeter. The guide also includes a generally concentric central opening extending therethrough. The central opening is sized to allow the reciprocating element to reciprocate therein. The guide also includes at least one inner opening extending between the first and second surfaces from the central opening toward the outer perimeter. The at least one inner opening extends generally parallel to the longitudinal axis.

Abstract: A fuel injection valve is capable of minimizing the waste of fuel and variations in the air-fuel ratio by weakening a water hammer action occurring as a result of sudden closing of a needle valve and thus suppressing the occurrence of a bouncing phenomenon. A water hammer absorbing member is provided between an armature and an injection hole to absorb and damp a water hammer pressure wave produced by sudden closing of the needle valve. Therefore, it is possible to reduce the pressure wave propagated to the armature, to which the needle valve is integrally secured, and hence possible to reduce the amount of lift of the needle valve due to a bouncing phenomenon. Accordingly, the amount of fuel excessively discharged is reduced. Thus, it becomes possible to minimize the waste of fuel and variations in the air-fuel ratio.

Abstract: A fuel injector valve for fuel injection systems of internal combustion engines has a magnetic coil, an armature to which the magnetic coil applies a force against a resetting spring in the lifting direction, and a valve needle connected to a valve closing member. The armature is able to move between a first stop connected to the valve needle and limiting the movement of the armature in the lifting direction and a second stop connected to the valve needle and limiting the movement of the armature against the lifting direction. The second stop is formed by a spring element.

Abstract: An EMD-type injector is provided with a spring seat in which the juncture between the head and the stem of the spring seat is formed as an undercut groove within specified shape parameters.

Abstract: At an outlet portion of an injection hole (8) of a fuel injection valve (1), through removal of a part (A1, 7B) of a wall forming the injection hole (8), a restriction to a spray flow is released, thereby, a deflection spray is formed in which the spray is rich at the side of restriction released and is learn at the side of restricted, accordingly, ignition property of an internal combustion engine is improved, and an optimum spray is realized which reduces exhaust amount of unburnt gas components.

Abstract: The invention relates to a high-pressure piston cylinder unit, especially an injection pump or an injection valve for an internal combustion engine, and to a method for producing one such high-pressure piston cylinder unit. The high-pressure piston cylinder unit has a piston which is guided inside a cylinder bore and which is coupled to an actuating element. The piston is subjected to a high pressure differential. According to the invention, fine grooves which run very close to one another are configured in at least one part of the guiding surface of the piston. The grooves ensure hydraulic pressure compensation on the periphery of the guiding surface, thus reducing wear, and prevent leakage in a longitudinal guiding direction.

Abstract: A fuel injection valve has a valve seat element having a fixed valve seat. A valve closure element coacts with the valve seat to open and close the valve. The valve seat element possesses an outer enveloping surface that is equipped with a coating made of a material other than the material of the valve seat element, or with an adhesive, by way of which a hydraulically sealed join can be achieved between the valve seat element and a valve seat support that receives the valve seat element. The fuel injection valve is suitable in particular for use in fuel injection systems of mixture-compressing spark-ignited internal combustion engines.

Abstract: A nozzle assembly includes a tip body having a lower end and defining a nozzle outlet. A needle sleeve is at least partially positioned in the tip body and includes a valve seat. A needle valve member is at least partially positioned within the needle sleeve, and is moveable between a closed position in contact with the valve seat and an open position out of contact with the valve seat. The needle valve member moves toward the lower end of the tip body when moving toward its open position. The nozzle assembly finds its preferred application in hydraulically-actuated fuel injectors having direct control needles.

Abstract: A unique variable orifice electronically controlled common variable rail injector (VOECCRI) for use in internal combustion engines characterized in part by the provision of injection ports or orifices along a tip portion of the nozzle housing having an internal cylindrical surface, and which cooperates in sealing and sliding relation with an internal hollow fuel needle having a cylindrical outer surface. In seating, the needle seats against a frusto-conical seat carried in the closure sac at the lower tip of the assembly, whereby leakage is controlled and precise opening of the injection orifices can be effected and programmed, as desired.

Abstract: A fuel injector, especially an injector for fuel-injection systems of internal combustion engines, includes a piezoelectric or magnetostrictive actuator arranged in an actuator space of a valve housing of the fuel injector, the actuator space being sealed from a fuel by a seal. A valve-closure member, which can be actuated by the actuator and interacts with a valve seat to form a sealed seat, assumes the actual valve operation. The seal has a sealing member and a sealing element. The sealing element is joined to the sealing member by a first circumferential welded seam, is elastically deformable and band-shaped, and is joined to the valve housing by a second circumferential welded seam.

Abstract: A fuel injector for an internal combustion engine is provided. The fuel injector includes a housing and an armature/needle assembly reciprocally mounted in the housing. The armature/needle assembly includes an armature having an armature end and a longitudinal armature channel extending therethrough and a needle having a longitudinal needle axis and a first needle end inserted in the armature channel. The first needle end is fixedly connected to the armature end. The assembly also includes at least one flow channel between the armature and the needle. The fuel injector further includes a valve seat located downstream of the needle. The needle is selectively engageable and disengageable with the valve seat to preclude fuel flow through an opening in the valve seat and to allow fuel flow through the opening in the valve seat, respectively. A method of forming the armature/needle assembly is also provided.

Abstract: A nozzle assembly for fuel injection in an internal combustion engine comprising a nozzle tip with a hollow interior defining a fuel chamber. The nozzle tip has at least one spray orifice opening to an outer surface on the nozzle tip, and a valve member at least partially disposed within the nozzle tip. The valve member is moveable between a first position in which the valve member contacts an upper valve seat to prevent fluid communication of fuel from the fuel chamber to the at least one spray orifice, and a second outward position in which the valve member contacts a lower valve seat to allow fluid communication of fuel from the fuel chamber to the at least one spray orifice. The valve member is directly electrically actuated, preferably by a solenoid. Further, the valve member is biased in the closed position and the valve member is pressure balanced when high pressure fuel in present in the fuel chamber.

Abstract: A fuel injection valve for intermittent injection of fuel into the combustion chamber of a diesel or other form of internal combustion engine. The valve achieves a shorter than usual injection valve member, while avoiding valve member oscillation but retaining precise closing by implementing a solenoid controlled piston that controls movement of the valve. The piston in turn is acted upon by fuel system pressure from a high pressure feed line and from a control chamber, alternatively, depending upon the position of an actuating element. The control piston has an annular land that faces the control chamber and the piston is connected to the high pressure feed line through a tight sliding fit in a piston guide bore establishing a leak gap. A relief chamber is formed between the outlet side of the gap and the land. When the injection valve is open, the land reduces fuel flow from the relief chamber into the control chamber.

Abstract: A fuel injector, in particular an injection valve for fuel injection systems of internal combustion engines, has a piezoelectric actuator or magnetostrictive actuator sealed against a fuel by an actuator seal and it has a valve closing body actuatable by the actuator and working together with a valve seat face to form a tight seat. The actuator seal includes a sealing element on the inlet end and a sealing element on the injection end, both designed to be elastically deformable and frictionally engaged with an actuating sleeve. The actuator acts on valve closing body by way of the actuating sleeve, thus at least partially compensating the forces generated by the fuel pressure and acting on the actuator by way of the actuating sleeve.

Abstract: There is provided a fuel injection valve in which an operation sound at the time of an operation of the fuel injection valve is lowered, and durability of parts is improved. A flat surface 4a of a valve body 4 is provided at a lower surface side of a should portion 3a provided at a needle valve 3, and when the needle valve 3 moves in a valve closing direction, a portion B in which fuel is confined is compressed at a place between a lower surface of the shoulder portion 3a and the flat surface 4a, so that a damping effect of fluid is obtained and an operation sound is lowered.

Abstract: This fuel injection valve is provided in a body thereof with a needle valve so that the needle valve can be moved in the axial direction and inclined by an angle of inclination of &thgr;1 with respect to the axis of the body, and with stopper plates with which a stopper portion of the needle valve is engaged when the valve is opened, and an angle of inclination &thgr;2 with respect to a perpendicular plane crossing the axis of the needle valve at right angles thereto is given between the stopper portion and stopper plates. The angle of inclination &thgr;2 between the stopper portion and stopper plates is set to be larger than that &thgr;1 in the axial direction of the needle valve, and the stopper portion is formed so that a ratio D1/D0 of an outer diameter D1 of the stopper portion of the needle valve to an inner diameter D0 of an inner chamber of the body becomes 0.6 to 1.1.

Abstract: The invention relates to an injection valve (10) for the fuel injection in a internal combustion engine, in particular in a diesel engine. The injection valve (10) has a holder body (20) in which a first passage (30) is formed. At the holder body (20) a nozzle body (40) of an injection nozzle (16) is secured in which a second passage (54) is formed which is connected to the first passage (30) and which together with the latter forms a fuel infeed line for the injection nozzle (16). Moreover, a closure mechanism (60) is provided for the closing off of the injection nozzle (16). A sleeve (74) serves for the sealing off of the connection point between the first and the second passage (30, 54).

Abstract: The present invention provides a valve arrangement for metering fluid flow. The valve arrangement includes a valve seat including an orifice through which fluid flows. The valve arrangement also includes a valve displaceable along an axis between a first position contiguously engaging the valve seat and a second position spaced from the valve seat. Fluid flow between the valve seat and the valve is prevented in the first position and is permitted in the second position. The valve arrangement further includes a counterweight mounted on the valve for relative movement therebetween.

Abstract: A high pressure gaseous fuel injector for injecting natural gas or other gaseous fuels at high pressures (eg. 300 to 700 psig more or less) into combustion engines for improved efficiency, better performance and reduced environmental emissions. The fuel injector is powered by hydraulic signals from an electrohydraulic valve. The fuel injector includes an outer cartridge housing and a universal valve cartridge mounted therein. The cartridge comprises an activator body and a valve body secured together, and the valve body has a gas valve slidable therein. The stroke of the valve is adjustable by controlling the size of shims in the valve body assembly, thereby providing a universal valve cartridge that can be easily adapted to differing fueling requirements for models and sizes of engines. The valve body includes a spring chamber between upper and lower valve guides.