Abstract: An upper guide system for a solenoid actuated fuel injector of an internal combustion engine includes an armature having a first diameter section, a reduced diameter second section, and a concave portion at the transition between the first and second sections. The guide system also includes a guide shaped to extend into the concave portion of the armature and includes a central opening that slidably receives the second diameter section. The guide positions and guides the armature in a radial and an axial direction. The guide is assembled in an axial location that is close to the axial location of the center of the magnetic force acting on the armature. The guide system allows for a desired relative large guide length to diameter ratio.

Abstract: A reducing agent metering system for delivering reducing agent to a lean burn internal combustion engine. The reducing agent metering system includes a metering system housing, a system for metering vaporized reducing agent to the internal combustion engine, the system positioned within the metering system housing and a system for delivering an atomized stream of liquid reducing agent to the lean burn internal combustion engine, the system positioned within the metering system housing, wherein the reducing agent metering system is operable to transition from metering vaporized reducing agent to delivering an atomized stream of liquid reducing agent to the lean burn internal combustion engine.

Abstract: In an electromagnetic fuel injection valve in which a valve assembly formed by integrally connecting a valve element and a movable core to each other is contained in a valve housing, and a first journal part and a second journal part are provided in the valve assembly so as to be supported slidably in the guide hole in a valve housing, the outside surface of the first journal part (21) is formed by a sliding surface (45) slidable on the inside surface of the guide hole (14) and a pair of tapered tilt surfaces (46, 47) connecting to both the front and rear sides of the sliding surface (45); at least the tilt surface (47) on the movable core side, of both the tilt surfaces (46, 47), is formed of a first tilt surface part (47a) connecting to an end part of the sliding surface (45) and a second tilt surface part (47b) connecting to the first tilt surface part (47a); and an angle that the first tilt surface part (47a) makes with a plane perpendicular to the axis line of a valve shaft part (19b) is set larger than

Abstract: In an electromagnetic fuel injection valve in which a non-magnetic cylinder is coaxially coupled at its front end to a rear end of a magnetic cylinder forming a portion of a valve housing to surround a portion of a movable core having a rear end face serving as a movable attraction face, and a stationary core having a front end face serving as a stationary attraction face is fitted and fixed at its front portion in a rear portion of the non-magnetic cylinder, so that the stationary attraction face is opposed to the movable attraction face, the stationary core (22) is fitted and fixed at its front portion in the non-magnetic cylinder (26), so that it is in close contact with an inner surface of an intermediate portion of the non-magnetic cylinder (26) in a region corresponding to the stationary attraction face (42), and an annular recess (44) having a flat portion (44a) flush connected to the stationary attraction face (42) is provided in an inner surface of the non-magnetic cylinder (26) to form an annular ch

Abstract: A fuel injection system for preventing fuel leakage to a combustion chamber when an engine is stopped includes an injector for injecting fuel, a case receiving the injector, a solenoid valve provided in a fuel passage connecting the injector and a nozzle pipe through a fuel supplying pipe, so as to supply and shut off fuel.

Abstract: A fuel injection valve has a connection piece for a fuel-supply line, a valve-seat support having a valve-seat body provided with a valve opening, a solenoid for activating a valve member, which controls the valve opening, and a plastic extrusion coat enclosing the connection piece, the solenoid and the valve-seat support. To achieve a cost-effective manufacture by requiring fewer components for the injection valve and providing a reduction in the assembly costs, the connection piece and the valve-seat support are made of plastic and designed as one-piece plastic housing together with the plastic extrusion coat. The yoke element for closing the magnetic circuit of the solenoid, which extends across the magnetic core and magnetic armature, is a magnetic material extrusion coat, which encloses the solenoid coil and adjoins the magnetic core in a gapless manner and ends in front of the magnetic armature with a gap clearance.

Abstract: A fuel injector equipped with an injection valve comprising a mobile plunger ending with a sealing head; a support body having a tubular shape and comprising a feed channel; and a sealing body, in which is defined a valve seat of the injection valve; the sealing head is of a frustoconical shape, is arranged externally relative to the guide element, is thrust by a spring against said guide element in a direction contrary to the direction of feed of the fuel; the valve seat has a frustoconical shape which is a negative reproduction of the frustoconical shape of the sealing head in order to impart an internally hollow conical shape to the injected fuel.

Abstract: A valve element of a fuel injection valve comprises a cylindrical structural base which has an upper end contactable with a lower end of a core tube installed in a cylindrical case and a spherical valve head which is contactable with a valve seat arranged at a lower end of the cylindrical case. The structural base is a sintered magnetic metal member produced through a metal powder injection molding method and has a relative density ranging from approximately 95% to approximately 98%, and the structure base has, at the end thereof that is contactable with the downstream end of the core tube, a notched surface for suppressing an undesirable sticking of the end of the structural base to the downstream end of the core tube.

Abstract: When a fuel injection valve is mounted on an engine, a distance between a core and an armature during non-energization of a coil can be prevented from becoming narrow. The coil is arranged inside the core, and a body is fixedly secured at its one end to an end of the core. A housing is arranged outside the coil with its one end abutting a cylinder head. A cap is arranged at the other end of the housing, and abuts at its side opposite to the housing with a fastening unit. The armature is arranged for reciprocation inside the body, and is magnetically attracted to the magnetized core. A gap is formed between the housing and the body, with the cap and the core being fixed to each other, and upon mounting the valve on the engine, the housing and the fastening unit abut the cylinder head and the cap, respectively.

Abstract: In an electromagnetic fuel injection valve in which a coil assembly is housed within a solenoid housing, an inlet tube is provided coaxially and integrally so as to be connected to the rear end of a fixed core, and the solenoid housing and at least a front part of the inlet tube are covered by a synthetic resin covering section having an integral power-receiving coupler, the resin-molded section (7) includes a first resin-molded layer (41) and a second resin-molded layer (42), the first resin-molded layer (41) being formed from a glass fiber-incorporated synthetic resin while forming a coupler main portion (40a) that defines a framework part of the power-receiving coupler (40), and the second resin-molded layer (42) being formed from a synthetic resin into which glass fiber is not incorporated so as to cover the first resin-molded layer (41), and in a section of the inlet tube (32) on the fixed core (23) side, when the thickness of the first resin-molded layer (41) is t1, the thickness of the second resin-mol

Abstract: [Problem] To reduce the size, lower the cost and increase and flatten the thrust of an electromagnetic actuator in which a plunger moves reciprocally. [Solution] The electromagnetic actuator comprises a yoke 130, a coil 180 arranged around the yoke, an armature 120 slidably arranged inside the yoke and integrally formed with a plunger 110, and a return spring 150 for returning the armature to a rest position, wherein the yoke 130 has, in a predetermined position on the axial direction L, a thickness-reduced annular gap groove 133 over part of an outer peripheral face 131, the thickness-reduced portion having a trapezoidal cross section widening outwards.

Abstract: A fuel injector for fuel-injection systems of internal combustion engines includes a valve-closure element cooperating with a valve seat, and a restoring spring which is situated in a spring pocket opening and acts upon the valve-closure element by a restoring force in the direction of the valve seat. The restoring spring has at least one holding coil in a region of the inflow side, whose area of cross section is positioned perpendicular to an area of cross section of the restoring spring.

Abstract: A compressed natural gas fuel injector including a housing, an inlet, an outlet, a seat, a closure member, and an attached nozzle. In a preferred embodiment, the inlet and outlet communicate a flow of gaseous fuel regulated by the closure member. The gaseous fuel passes through the seat, which is coupled to a rim surface of a retainer portion of the attached nozzle, and into a flow passage that further communicates the flow of gaseous fuel into one or more flow channels. The orientation of the flow channels within the attached nozzle greatly affects the discharge pattern and mixing characteristics of the gaseous fuel within an intake manifold. A method of flowing gaseous fuel through the fuel injector is also described.

Abstract: A fuel injector for an internal combustion engine includes a valve body 14. A valve seat 18 is associated with the valve body. The valve seat defines an outlet opening 24 through which fuel may flow. An armature 38 is associated with the valve body and is movable with respect to the valve body between a first position and a second position. The armature is associated with a closure member 24 proximate the outlet opening and contiguous to the valve seat when in the first position, and spaced from the valve seat when in the second position. An electromagnetic coil 44 is energizable to provide magnetic flux that moves the armature between the first and second positions to control liquid fuel flow through the outlet opening. A heating coil 50 is energizable to provide heat and thereby vaporize liquid fuel as it exits the outlet opening.

Abstract: An orifice disc for a fuel injector includes two orifices that provide a desired interaction between two fuel flows to increase fuel atomization and improve combustion performance. The orifice disc includes a first orifice and a second orifice that are disposed at an interaction angle relative to each other. The orifices are orientated relative to each other such that fuel flow exiting the outlets impinges on each other to further reduce the size of fuel droplets. Large dramatic changes in momentum caused by the impingement of fuel flows disintegrates fuel droplets into much smaller finer fuel droplets that provided enhanced atomization.

Abstract: A fuel injector is described. The fuel injector includes an inlet, outlet, seat, closure member, and a metering orifice disc. The metering orifice disc is disposed between the seat and the outlet. The metering orifice disc includes: a generally planar surface, a plurality of metering orifices that extends through the generally planar surface, the metering orifices being located radially outward of the seat orifice; and at least one flow channel having a cross-sectional area that decreases in magnitude starting at a location spaced from the longitudinal axis to proximate a perimeter of a metering orifice. A seat subassembly and a metering orifice disc are described. And a method of atomizing fuel is also described.

Abstract: An electronically controlled fuel injector includes a reduced part count and complexity over similar fuel injectors without a substantial reduction in performance capabilities. This is accomplished by using a one-piece needle that is hydraulically balanced and biased toward a closed position with a spring positioned in the needle control chamber. Although subtle, this injector has some ability to control the fuel pressure when the needle valve is opening and closing by adjusting a relative timing of a pressure control valve opening relative to a needle control chamber, using separate electrical actuators. The disclosure is particularly applicable to fuel injectors that cycle through high and low pressure states during and between injection events, respectively. Cam actuated fuel injectors being particularly well suited.

Abstract: An injection valve for fuel-injection systems has a valve-seat support, a valve needle, a solenoid and a connection piece having a filter, to convey the fuel. Valve opening and valve seat are formed on the one-piece valve-seat support itself, which additionally guides the valve needle so as to be axially displaceable; solenoid coil and connector plug are combined in a separate, plastic-extrusion-coated coil part, the magnetic cup is placed over the coil part, and the connection piece is formed as separate plastic-injection-molded part having an integrated filter. Joining and sealing points between the connection piece on the one side and the coil part, magnetic cup and/or valve-seat support on the other side are bonded.

Abstract: A fuel injector having an injection nozzle; an injection valve having a movable pin for regulating fuel flow through the injection nozzle; an electromagnetic actuator for moving the pin between a closed position and an open position respectively closing and opening the injection valve; and a tubular supporting body, which has a central channel for feeding pressurized fuel to the injection nozzle, and houses the electromagnetic actuator, the injection valve, and the pin; the supporting body is formed by joining a one-piece tubular top member housing the electromagnetic actuator and made of high-tensile steel with poor magnetic characteristics, and a one-piece tubular bottom member housing the injection valve and made of a low-thermal-expansion alloy.

Abstract: A fuel injection valve is provided that includes a valve seat member (3) having provided therein a conical valve seat (8) and a valve seat hole (7) communicating with the downstream end of the valve seat (8), a flat fuel diffusion chamber (43) radially extending from the valve seat hole (7), the fuel diffusion chamber (43) being formed between the valve seat member (3) and an injector plate (10), and a plurality of fuel injection holes (11) bored in the injector plate (10) so as to open in the fuel diffusion chamber (43), wherein the fuel injection holes (11) are arranged so as to be radially outwardly separated from the valve seat hole (7), and when the height of the fuel diffusion chamber (43) is t1 and the length of the valve seat hole (7) is t2, t2/t1?2.

Abstract: A fuel injector and various methods relating to the assembly of the fuel injector. The fuel injector includes a power group subassembly and a valve group subassembly having a respectively connected first and second connector portions. The power group subassembly includes an electromagnetic coil, a housing, at least one terminal, and at least one overmold formed over the coil and housing. The valve group subassembly insertable within the overmold includes a tube assembly having an inlet tube and a filter assembly. A pole piece couples the inlet tube to one end of a non-magnetic shell having a valve body coupled to the opposite end. An axially displaceable armature assembly confronts the pole piece and is adjustably biased by a member and adjusting tube toward engagement with a seat assembly. A lift setting device sets the axial displacement of the armature assembly. The seat assembly includes a flow portion and a securement portion having respective first and second axial lengths at least equal to one another.

Abstract: A fuel injector and various methods relating to the assembly of the fuel injector. The fuel injector includes a power group subassembly connected to a valve group subassembly. The power group subassembly includes an electromagnetic coil, a housing, at least one terminal, and at least one overmold formed over the coil and housing. The terminal has a first generally planar surface contiguous with a generally planar surface of a terminal connector to electrically connect the terminal to the electromagnetic coil. The valve group subassembly includes a tube assembly having an inlet tube and a filter assembly. A pole piece couples the inlet tube to one end of a non-magnetic shell having a valve body coupled to the opposite end. An armature assembly confronts the pole piece and is adjustably biased by a member and adjusting tube toward engagement with a seat assembly. A lift setting device sets the axial displacement of the armature assembly.

Abstract: A fuel injector with direct needle control has a nozzle needle guided in a nozzle body, and an actuator and a hydraulic pressure boosting unit that has an actuator pressure boosting piston connected to the actuator and a nozzle needle pressure boosting piston connected to the nozzle needle. The actuator pressure boosting piston and the nozzle needle pressure boosting piston both act on a coupler chamber. The nozzle needle pressure boosting piston contains a cylindrical chamber in which a control piston is axially guided, whose coupler chamber pressure surface is exposed to the coupler chamber and whose differential pressure chamber pressure surface is exposed to an inner differential pressure chamber contained in the cylindrical chamber. At its end oriented away from the coupler chamber, the nozzle needle pressure boosting piston is associated with an outer differential pressure chamber that communicates with the inner differential pressure chamber via a hydraulic connection.

Abstract: A fuel injector for an internal combustion engine including a body, a stator member, an armature, an electromagnetic coil, and a diamagnetic member. The body includes a passage extending along a longitudinal axis between inlet and outlet ends. The armature member is movable with respect to the stator member between a first configuration and a second configuration, and includes a closure member proximate the outlet end and contiguous to a seat in the first configuration, and spaced from the seat in the second configuration. The electromagnetic coil surrounds the passage, is disposed in a housing, and is energizable to provide magnetic flux that moves the armature between the first and second configuration to permit fuel flow through the passage. The diamagnetic member is proximate the electromagnetic coil so that when the electromagnetic coil is energized the magnetic flux flows around the diamagnetic member.

Abstract: A fuel injection valve comprises a valve seat, a movable valve element which is seated on or separated from the valve seat, and a nozzle member having a plurality of nozzle holes. At least one of the valve element and valve seat has a curved surface at a contact position where they contact with each other when the valve element is seated on the valve seat. Two or more of the nozzle holes are provided outside an intersection line of a virtual extension surface along a tangential line to the curved surface at the contact position and a surface of the nozzle member.

Abstract: A fuel injector. The fuel injector includes a fuel channel configured to receive pressurized gaseous fuel from a fuel rail, and a nozzle in fluid communication with the fuel channel. The fuel injector also includes a pintle having an opened position and a closed position, wherein pressurized gaseous fuel is delivered from the nozzle when the pintle is in the opened position and wherein introduction of the pressurized gaseous fuel is substantially blocked when the pintle is in the closed position. A support aligns the pintle with the nozzle. A pintle controller is configured to selectively move the pintle between the closed position and the opened position.

Abstract: A fuel injector for use with an internal combustion engine. The fuel injector comprises a valve group subassembly and a coil group subassembly. The valve group subassembly includes a tube assembly having a longitudinal axis that extends between a first end and a second end; a seat that is secured at the second end of the tube assembly and that defines an opening; an armature assembly that is disposed within the tube assembly; a member that biases the armature assembly toward the seat; an adjusting tube that is disposed in the tube assembly and that engages the member for adjusting a biasing force of the member; a filter that is at least within the tube assembly; and a first attachment portion. The coil group subassembly includes a solenoid coil that is operable to displace the armature assembly with respect to the seat; and a second attachment portion that is fixedly connected to the first attachment portion.

Abstract: A tubular member is arranged radially inward of a coil to cover outer peripheral parts of a movable core and of a stationary core. The stationary core has a tapered portion in an opposing portion, which is opposed to the movable core. The stationary core also has a large diameter portion on a counter movable core side of the tapered portion. An outer diameter of the tapered portion is increased from an opposing end surface side part toward the large diameter portion. The outer diameter of the opposing end surface of the opposing portion, which is opposed to the movable core, is generally the same as an outer diameter of the movable core. An outer diameter of the large diameter portion of the stationary-core is larger than the outer diameter of the movable core.

Abstract: In a fuel injection valve for slanted fuel injection, provided between a conical flow path and an injection port is an intermediate flow path having a cylindrical surface coaxial to the conical flow path, so that the injection port has a portion of the cylindrical surface connected to the conical surface of the conical flow path and another portion of the cylindrical surface connected to the cylindrical surface of the intermediate flow path, whereby generation of stagnation of flow of fuel is suppressed to decrease the formation of the carbon deposit. The intermediate flow path has a tapered conical surface that is connected to a downstream side end portion of said cylindrical surface and that includes a diameter gradually decreases in the direction of flow of fuel to cope with where the injection port diameter is small. A cone apex angle of the conical surface of the intermediate flow path is smaller than a cone apex angle of the valve seat surface.

Abstract: A fuel injector is described that includes a polymeric housing, pole piece, filter assembly, coil assembly, spring member, armature assembly and metering assembly. The polymeric housing has a passageway extending between an inlet and an outlet along a longitudinal axis. The pole piece is disposed in the passageway. The metering assembly is secured to the polymeric housing proximate the outlet. The metering assembly has a seat molded to a polymeric support member via at least one annular ridge. A method of making a metering assembly is described.

Abstract: A fuel injector and various methods relating to the assembly of the fuel injector. The fuel injector includes a power group subassembly and a valve group subassembly having a respectively connected first and second connector portions. The power group subassembly includes an electromagnetic coil, a housing, at least one terminal, and at least one overmold formed over the coil and housing. The valve group subassembly insertable within the overmold includes a tube assembly having an inlet tube and a filter assembly. A pole piece couples the inlet tube to one end of a non-magnetic shell having a valve body coupled to the opposite end. An axially displaceable armature assembly confronts the pole piece and is adjustably biased by a member engaged with an adjusting tube with a filter assembly mounted thereon. The seat assembly includes a flow portion and a securement portion having respective first and second axial lengths at least equal to one another.

Abstract: A fuel injection method is provided for correcting the fuel injection amount accurately by eliminating offset components when detecting a current flowing through a solenoid for fuel injection. A current component, which is detected during normal running and a drive current flowing through the solenoid for fuel injection is OFF (Step 11), is input to an A/D converter that stores the value thereof (Step 12). Thereafter, the drive current is turned ON (Step S13), elapse of a fixed time period is waited (Step S14), and an input voltage of the A/D converter is detected (Step S15). A difference current (offset component) is calculated by subtracting the offset voltage from the input voltage (Step S16), and a current span is adjusted based on a span correction factor (Step S17). Thereafter, a pulse width current correction factor is calculated (Step S2a) and, based on the pulse width current correction factor, a drive pulse width is calculated (Step S2b) and provided to the solenoid.

Abstract: A fuel injector is described that includes a polymeric housing, pole piece, filter assembly, coil assembly, spring member, armature assembly and metering assembly. The polymeric housing has a passageway extending between an inlet and an outlet along a longitudinal axis. The pole piece is disposed in the passageway, the pole piece having a through opening. The filter assembly has a portion disposed in the through opening of the pole piece. The coil assembly is disposed in the polymeric housing to surround the pole piece. The spring member is disposed partly in the pole piece and including a spring portion contiguous with the portion of the filter assembly. The armature assembly is disposed in the passageway in a first position having a first portion confronting the pole piece and in a second position having a closure member contiguous to an end face of the pole piece. The metering assembly is secured to the polymeric housing proximate the outlet.

Abstract: A needle valve 20 having a seat contact section 24 at a leading end is provided. A nozzle body 22 having a seat section 26 with which the seat contact section 24 comes into contact is provided. The nozzle body 22 comprises a tapered surface 34, which includes the seat section 26, and a fuel receiver section 28, which includes a spherically shaped sack wall surface 36. The leading end of the needle valve 20 comprises a first protrusion 38, which is tapered to have a greater taper angle than the tapered surface 34, and a second protrusion 40, which is tapered to have a smaller taper angle than the first protrusion 38. More specifically, the second protrusion 40 is conically shaped.

Abstract: A fuel injector is described. The fuel injector includes an inlet, outlet, seat, closure member, and a metering orifice disc. The metering orifice disc is disposed between the seat and the outlet. The metering orifice disc includes a generally planar surface, at least two metering orifices, and at least one flow channel. The at least two metering orifices are generally located along an axis extending radially away from the longitudinal axis and radially outward of the seat orifice. Each of the metering orifices has a center defined by the interior surface of the metering orifice extending through the disc. The at least one flow channel extends radially away from the longitudinal axis towards each of the at least two metering orifices. And a method of atomizing fuel is also described.

Abstract: Among other aspects shown and described, a fuel supply apparatus that provides multiple fuel spray targeting angles as a function of fuel pressure towards a combustion chamber of an engine to reduce hydrocarbon emission during cold-start or hot-start. A method and fuel system are also shown and described.

Abstract: A dosing device for liquid fuels, in particular for input into a chemical reformer in order to recover hydrogen or into a post-combustion device in order to generate heat, includes at least one metering device for metering fuel into a metering conduit and a nozzle body, adjoining the metering conduit, includes at least one spray discharge opening which opens into a metering chamber, including a nozzle body having a perforated spray insert in which at least one spray discharge opening is disposed.

Abstract: An internal combustion engine fuel injector (1) has a rod (10) movable along an axis (3) to open/close a nozzle, and a servovalve (7) having a control chamber (23) with a discharge passage (26) which is opened/closed by a shutter (17) movable axially under the control of an electro-actuator (14); the servovalve (7) also has a fixed axial rod (33) having an outer lateral surface (34) through which the discharge passage (26) comes out; the shutter (17) is fitted to the axial rod (33) to slide axially in substantially fluidtight manner, and, when closing the discharge passage (26), is subjected to substantially zero resultant axial pressure by the fuel; and the control chamber (23) is bounded radially by a tubular portion (8) formed in one piece with said axial rod (33).

Abstract: A fuel injector 10 may comprise a valve body 14 having a fuel path, a valve seat 23 fixed to a downstream end of the valve body, and a valve 25 that opens and closes a fuel injection hole of the valve seat 23. The valve may be housed within the valve body in a manner allowing sliding. An armature 31 may be attached to an upstream end of the valve 25, and a valve closing element 32 may be attached to a downstream end of the valve 25. A core 21 may be disposed at an upstream side of the armature 31. A downstream end surface of the core 21 faces an upstream end surface of the armature 31. When the valve 25 opens the fuel injection hole, the downstream end surface of the core 21 makes contact with the upstream end surface of the armature 31. A non-magnetic ring 20 may be disposed at an outer circumference side of the armature 31 and the core 21.

Abstract: A fuel injector assembly includes a first coil that induces a time varying magnetic field into a second coil that is utilized to heat fuel flowing through the fuel injector. A first coil receives a first signal from a driver to generate a first magnetic field that moves an armature between an open and closed position. The second coil generates a second magnetic field generated by a current induced by the first coil into the second coil. The induced current is generated by an alternating current signal that is interposed onto a direct current signal sent to the first coil. The alternating current signal produces a time varying second magnetic field that induces heating of a magnetically active component with the fuel flow that in turn heats the fuel.

Abstract: In a fuel injector (1) configured so that fuel injection is controlled by a solenoid valve (4), the solenoid valve (4) comprises an electromagnet (43), an armature bolt (41) that has a ball (42) and a plate member (41A) attached thereto and is spring-biased in the valve closing direction by a spring member (48), a stopper member (49) that limits movement of the plate member (41A) in order to limit the maximum stroke of the ball (42) and an armature plate (44) through which the armature bolt (41) passes and which collaborates with the solenoid valve (4), the contact area (S2) between the armature plate (44) and the plate member (41A) being made larger than the contact area (S1) between the plate member (41A) and the stopper member (49).

Abstract: Using a swirl type fuel injection valve, a concentrated spray area and a thin spray area are formed, the positions thereof are adjusted, and the spray is made to conform to the geometric shape of the engine and mounting position of the fuel injection valve, so as to reduce the fuel consumption and control the unburnt components in exhaust gas. The fuel injection valve is so constructed that a step is formed on the injection hole opening of the fuel injection valve, so as to provide two or more edge transition portions at the injection hole opening, resulting from the step, and the line connecting the edge transition portions forms an oblique angle relative to the wall formed by the step perpendicular to the injection hole center axis and the angled wall.

Abstract: A fuel injector is described that includes a polymeric housing, pole piece, filter assembly, coil assembly, spring member, armature assembly and metering assembly. The polymeric housing has a passageway extending between an inlet and an outlet along a longitudinal axis. The pole piece is disposed in the passageway. The metering assembly is secured to the polymeric housing proximate the outlet. The metering assembly has an O-ring disposed between a seat molded to a polymeric support member. The polymeric support member includes a peripheral portion bonded to the polymeric housing proximate the outlet. A method of sealing a fuel injector outlet end is described.

Abstract: A fuel injector is described that includes a polymeric housing, pole piece, filter assembly, coil assembly, spring member, armature assembly and metering assembly. The polymeric housing has a passageway extending between an inlet and an outlet along a longitudinal axis. The pole piece is disposed in the passageway. The metering assembly is secured to the polymeric housing proximate the outlet. The metering assembly has a guide member to guide a closure member through an aperture and along the longitudinal axis. The guide member may be cup-shaped and include offset apertures to allow fuel to travel along the passageway toward the outlet.

Abstract: A fuel injector includes a body, filter, and damper member. The body extends along a longitudinal axis between an inlet end and an outlet end with a flow passage extending therebetween. The filter is disposed in the flow passage proximate the inlet end. The damper member extends from a first terminus to a second terminus. The first terminus is proximal to the longitudinal axis, and the second terminus is distal to the longitudinal axis. The damper member extends from the first terminus about the longitudinal axis towards the second terminus in a generally circular path to define an aperture that permits fluid communication between inlet end and the filter. The damper member is secured to the flow passage between the inlet end and the filter. A damper member is also shown and described. A method of reducing sound in the valve group subassembly is also disclosed.

Abstract: A fuel injector is described that includes a polymeric housing, pole piece, filter assembly, coil assembly, spring member, armature assembly and metering assembly. The polymeric housing has a passageway extending between an inlet and an outlet along a longitudinal axis. The pole piece is disposed in the passageway. The metering assembly is secured to the polymeric housing proximate the outlet. The metering assembly has a seat molded to a polymeric support member. The polymeric support member may be cylindrical and bonded to the polymeric bore proximate the outlet. A method of operating the fuel injector is described.

Abstract: A fuel injector (1) for an internal-combustion engine has a shell (2) provided with two opposite terminal portions; the first terminal portion (4) has an inlet (7) for supply of the fuel and is generally designed to extend outside the engine, whilst the second terminal portion (5) has a nozzle (9) communicating with said inlet (7), is designed to be housed in the engine and has, in the radial direction, dimensions smaller than those of the first portion (4); the injector (1) further has an actuator (16) and a servo valve (15) housed in the first terminal portion (4); the servo valve (15) is provided with an open/close element (32), which can slide axially, under the action of the actuator (16) and substantially in a fluid-tight way, in a seat (27) and is subjected to an axial resultant of pressure of the fuel that is substantially zero; the fuel inlet (7) is made laterally in an intermediate axial position between the actuator (16) and the nozzle (9).

Abstract: A solenoid-type fuel injector assembly having at least one component formed of stabilized, solenoid-quality ferritic stainless steel. In a preferred embodiment, an austenitic fuel tube is laser-welded to an injector body and to a solenoid pole piece formed of the subject material. The stabilized, solenoid-quality ferritic stainless steel, preferably a free-machining grade thereof, comprises from about 10% to about 35% chromium, and at least one stabilizing element selected from the group consisting of titanium and columbium. Components thus formed are weldable, exhibit soft magnetic properties sufficiently strong for carrying a magnetic flux in a solenoid pole piece, have desired structural and mechanical properties, and reduce the susceptibility of a solenoid-type fuel injector to metallurgical sensitization and intergranular corrosive attack at weld sites.

Abstract: A fuel injection valve includes a valve member, a first stop member, a second stop member, a movable core, a fixed core, and a coil. The valve member opens and closes an injection nozzle. The first stop member protrudes radially outward from said valve member. The second stop member protrudes radially outward from said valve member. The movable core is sandwiched between said first and second stop members. The movable core and one of said first and second stop members defines a fuel chamber. The fixed core is axially displaced from said movable core. The coil causes reciprocal axial displacement of said valve member such that said movable core axially reciprocates toward and away from said fixed core therewith.

Abstract: A fuel jet adjusting plate has first nozzle holes arranged along a first circle coaxial with a central axis of a valve body and second nozzle holes arranged along a second circle coaxial with the central axis and having a diameter larger than that of the first circle. Each hole axis of the second nozzle holes forms an acute angle with a reference plane perpendicular to the central axis of the valve body smaller than that formed by each hole axis of the first nozzle holes with the reference plane. Hence, fuel sprays injected through the first nozzle holes can be directed away from fuel sprays injected through the second nozzle holes. As a result, the fuel sprays injected through the first nozzle holes do not interfere with the fuel sprays injected through the second nozzle holes, which makes it possible to suitably atomize injected fuel.