Abstract: An electronic fuel injector capable of supplying fuel in a stable manner is provided by employing a swirler, which is manufactured at a lower cost and has durability, and by ensuring superior wear resistance of the swirler and a valve member provided on a movable part, which is put into frictional contact with the swirler. The electronic fuel injector comprises a movable part, a valve member, a valve seat, a swirler, a stopper, a stator core, a casing, a spring, and an electromagnetic coil. A valve member is provided at a fore end of the movable part. The swirler serves not only to swirl fuel, but also to guide movement of the valve member provided at the fore end of the movable part. The swirler is formed of a powder sintered compact of martensitic stainless steel having corrosion resistance and wear resistance.

Abstract: To enable the inclination of the injection direction and the distribution of the penetration force of spray to be adjusted over a wide range, and an axially symmetrical spray shape to be obtained even when the injection hole is inclined, or the shape of the spray to be changed without inclining the injection hole, a fuel passageway 203 is provided as a swirling force adjustment means between the valve seat 201 and injection hole 101 of the fuel injector. This swirling force adjustment means adjusts the distribution of the swirling force of the fuel flowing into injection hole 101, and thus adjusts the spray shape obtained as a result.

Abstract: A fuel injection device for internal combustion engines having a magnet valve that has a damping chamber and a relief chamber which communicate hydraulically through a damping throttle that damps in both laminar and turbulent fashion. As a result, the waviness of the characteristic curves of the fuel injection system is reduced and its function is improved.

Abstract: A fuel injector (1) is provided with a magnetic coil (10), which cooperates with an armature (20) acted upon by a restoring spring (23), the armature forming an axially movable valve part together with a valve needle (3). A valve-closure member (4), which forms a sealing seat with a valve-seat member (5), is provided at the valve needle (3). A flange (14), which penetrates the armature (20) through an opening (19) of the armature (20) and which is connected to the valve needle (3) by force-locking, has at least one radial fuel channel (11) with whose aid an inner chamber (29) of the fuel injector (1) is able to be connected to a recess (22) of the valve needle (3) upon actuation of the fuel injector (1).

Abstract: A fuel injector for fuel injection systems in internal combustion engines. The injector includes a housing in which valves arranged in series are accommodated. One of the valves is actuated by an actuator assigned to the injector. Each of the valves is assigned a controllable control space, each having one inlet. The valves are designed as inwardly opening valves. One of the valves, which may be actuated by the actuator, acts by way of a spring package upon the other of the valves, which is under prestress by a first spring element.

Abstract: A fuel injector includes a pressure intensifying chamber communicating with a fuel supply passage through a check valve, a plunger for pressure-intensifying fuel introduced into the pressure intensifying chamber, and a needle valve for injecting the fuel pressure-intensified in the pressure intensifying chamber through an injection port, wherein there is provided in the fuel supply passage a throttle passage normally communicating with a fuel drain passage, air being bled during startup while leaking fuel.

Abstract: A fuel injector, in particular a fuel injector for fuel-injection systems of internal combustion engines, includes a first magnetic coil cooperating with a first armature, a second magnetic coil cooperating with a second armature, and a valve needle which is in force-locking connection with the first armature via a first flange and to the second armature via a second flange, to actuate a valve-closure member. A restoring spring acts upon the valve needle in a closing direction of the fuel injector. A first positioning spring, situated between the first flange and the first armature, acts upon the first armature in the closing direction of the fuel injector, while a second positioning spring, situated between the second flange and the second armature, acts upon the second armature in an opening direction of the fuel injector.

Abstract: An electromagnetic actuator for a fluid pressure control valve in a fuel injector for an internal combustion engine is disclosed. The fuel injector comprises a control module including a fuel pressure control valve; an armature connected to the fuel pressure control valve; and a stator assembly including a magnetic core comprising of at least two segments and a bobbin. The stator assembly, when it is energized by a power source, produces a magnetic field to draw the armature towards the stator assembly.

Abstract: Disclosed is an injector for fuel injection, with a magnet valve for controlling an injection valve, in which the magnet valve has a movable armature that can be moved onto a valve seat in the lower armature chamber. The lower armature chamber communicates fluidically with the control pressure chamber of the injection valve via bores. Via a return bore, incidental leak fuel quantities can be returned to a tank via the lower armature chamber. To prevent armature recoil upon closure of the valve seat by the armature, it is proposed that means be provided in the injector for reducing pressure fluctuations occurring in the lower armature chamber. Eliminating pressure fluctuations in the lower armature chamber leads to maximal elimination of armature recoil.

Abstract: A fuel injection valve includes: a magnetic barrel body made of a magnetic material and shaped substantially into a barrel, a core barrel made of a magnetic material and shaped substantially into a barrel, a valve seat member positioned on a downstream side of the core barrel and disposed in the magnetic barrel body, a valve body positioned between the core barrel and the valve seat member, an O-ring positioned in a vicinity of a flange portion of the magnetic barrel body, a fuel filter assembly disposed at the first end on the fuel's influx side of the magnetic barrel body. A flange of the fuel filter assembly is made of a material lower in hardness than the magnetic material of the magnetic barrel body. The flange of the fuel filter assembly has a diameter larger than the diameter of the flange portion of the magnetic barrel body.

Abstract: The injector has a hollow body supporting an ordinary injection nozzle and a metering valve for metering the fuel to be injected; and a support defined by a sleeve and by an end wall. The sleeve houses an electromagnet controlling the metering valve, and is fitted to the hollow body. For which purpose, there is provided a leaf spring having a ring-shaped portion engaging the end wall of the support; and a number of elastic blades, each terminating with a hook-shaped appendix which engages a corresponding retaining element on the hollow body.

Abstract: A fuel injector for fuel injection systems of internal combustion engines has a valve-closure member that is in working engagement with a valve needle and that coacts with a valve-seat surface positioned in an orifice of a valve-seat member to form a sealing seat. The fuel injector has at least one spray discharge opening positioned in the valve-seat member. Between the valve-seat surface and the spray discharge opening, a second surface that make a more acute angle with the center axis of the fuel injector than the valve-seat surface, is formed by the orifice of the valve-seat member. A closure element extension whose enveloping surface forms an obtuse angle with the contiguous contour of the valve-closure member is positioned at the downstream end of the valve-closure member.

Abstract: An electromagnetic fuel injection valve includes a valve housing coupled to at one end thereof to a valve seat member; a stationary core coupled to the other end of the valve housing; and a valve assembly comprised of a movable core slidably accommodated in the valve housing, and a valve member connected to the movable core through a rod portion and adapted to cooperate with the valve seat. In the electromagnetic fuel injection valve, the valve housing is provided with a guide portion on which the valve assembly is axially slidably carried, and a high-hardness coating of diamond-like carbon including silicon is formed on an outer peripheral surface of the valve assembly contacting with the guide portion. The surface roughness Rmax of the high-hardness coating is set in a range of 0.05 to 0.2 ?m.

Abstract: A fuel injector for use with an internal combustion engine. The fuel injector can include a tube assembly, an armature assembly, a working air gap, a coil, and a housing. The tube assembly has a longitudinal axis and includes a non-magnetic tube having a first end and a second end, and a pole piece disposed inside the non-magnetic tube intermediate the first and second ends. The armature assembly is disposed within the tube assembly between the pole piece and the first end. The armature assembly includes an end face resiliently biased away from the pole piece. The working air gap separates the end face and the pole piece when the end face is biased away from the pole piece. The coil is connectable to an electrical power source and operable to displace the end face toward the pole piece against the resilient bias on the armature assembly. The housing is positioned adjacent the working air gap and supports the coil on the tube assembly.

Abstract: An electromagnetic fuel injector of an internal combustion engine having a plurality of electromagnetic coils for valve driving wound separately on a bobbin in an axial direction. The bobbin has a step difference of the outer diameter so that the bobbin outer diameter in the region with the second coil to be wound thereon is smaller then the bobbin outer diameter in the region with the first coil to be wound thereon, and the bobbin inner diameter has a step difference in that the bobbin inner diameter in the region with the first coil to be wound thereon is made large partially so as to secure an annular space to interpose a seal ring therein.

Abstract: In a fuel injection valve, an adjustment pipe made of stainless steel and for adjusting a compression amount of a spring biasing a valve member is press-fitted into a cylindrical housing made of stainless steel, and a fuel injection amount is adjusted by adjusting a spring force of the spring in accordance with a press-fitted amount of the adjustment pipe. The adjustment pipe is immersed in an oxalic acid solution so that an oxalate film is formed thereon before being press-fitted into the cylindrical housing. Therefore, the oxalate film prevents a direct press-contact between an outer peripheral surface of the adjustment pipe and an inner peripheral surface of the cylindrical housing.

Abstract: A fuel injector (1) for fuel injection systems of internal combustion engines has a solenoid (10), a valve needle (3) pressed in the closing direction by a return spring (23) to activate a valve closing member (4), which together with a valve seat surface (5) forms a sealing seat, and an armature (20) in friction-locking connection with a valve needle (3). A first guide sleeve (35) and a second guide sleeve (36) are connected to the valve needle (3). The armature (20) has radial play with respect to the valve needle (3) as a result of the central opening (34), the diameter of which is greater than the diameter of the valve needle (3).

Abstract: A fuel injection valve that sprays a finer particulate fuel has a tightly closed valve portion and can be assembled by press-fitting. A cup-shaped injection hole plate has its entire circumference joined to a valve body, has a bottom portion with injection holes, and has a cylindrical portion provided upright from the peripheral edge of the bottom portion. A resin sleeve has a resin annular portion with an opening that opens toward the downstream direction of fuel sprayed from the injection hole plate, and a resin cylindrical portion provided upright from the peripheral edge of the resin annular portion. The injection hole plate is provided with projections and the sleeve is provided with cutout grooves to engage the projections.

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 fuel injector for directly injecting fuel into the combustion chamber of an internal combustion engine includes a solenoid coil, an armature that can be acted upon by the solenoid coil in a stroke direction in opposition to a first resetting spring, and a valve needle connected to a valve-closure member. The valve needle has a first limit stop for the movable armature, the armature additionally being acted upon by a second resetting spring. A stationary second limit stop is provided for the armature. The second resetting spring acts upon the armature contrary to the stroke direction and, in the resting position, when the solenoid coil is not excited, the second resetting spring holds the armature in position at the second limit stop such that the armature is at a preestablished distance from the first limit stop configured on the valve needle.

Abstract: In a fuel injection device, a metal inner tubular member has a step in an outer peripheral wall of the metal inner tubular member, and an axial end surface of an upstream end portion of a metal outer frame member axially abuts against the step of the metal inner tubular member.

Abstract: An armature lift assembly for a fuel injector is disclosed. The assembly includes a body having an upstream end, a downstream end, and a longitudinal body channel extending therethrough and an armature/needle assembly which is reciprocably disposed in the body along the longitudinal body channel. The assembly further includes a first tube having an upstream end, a downstream end fixedly connected to the upstream end of the body, and a first tube channel. The assembly also includes a second tube located within the first tube channel and fixedly connected to the first tube. The second tube has an upstream end and a downstream end. The downstream end of the second tube is spaced a distance from the upstream end of the armature/needle assembly approximately equal to a lift distance of the armature/needle assembly. A method of setting armature/needle lift in a fuel injector is also disclosed.

Abstract: A fuel injector, e.g., a fuel injector protruding directly into a combustion chamber of an internal combustion engine, includes an energizable actuator, a valve-closure member able to be moved by the actuator, a secure valve seat, with which the valve-closure member cooperates to open and close the valve, a fuel outlet formed in a downstream spray-discharge region and by at least one outlet opening situated downstream from valve seat, and a dead volume formed downstream from valve seat and upstream from the spray-discharge region having at least one outlet opening. A surface of valve-closure member bordering the dead volume has a surface structure having at least several pores with a surface roughness of at least 25 &mgr;m for gas accumulation.

Abstract: A fuel injector, e.g., an injector for fuel injection devices in internal combustion engines, has a valve needle with a valve-closure member which cooperates with a valve seat surface in a valve seat body to form a sealing seat, in which the valve seat body has a plurality of injection orifices that are isolated from the fuel supply by sealing seat. The valve-closure member has a pressure element in a recess facing the valve seat body, which is pre-tensioned against the valve seat body by a spring which is supported on the valve-closure member and presses a disc spring against the valve seat body, in such manner that the disc spring covers at least one of the injection orifices, and the spring element uncovers this injection orifice when the tension exerted by the pressure element is removed.

Abstract: A fuel injector includes a homogenous charge nozzle outlet set and a conventional nozzle outlet set controlled respectively, by first and second needle valve members. One of the needle valve members moves to an open position while the other needle valve member remains stationary for a homogeneous charge injection event. The former needle valve member stays stationary while the other needle valve member moves to an open position for a conventional injection event. One of the needle valve members is at least partially positioned in the other needle valve member. Thus, the injector can perform homogeneous charge injection events, conventional injection events, or even a mixed mode having both types of injection events in a single engine cycle.

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 located at the first end of the tube assembly and that has an integral retaining portion; an O-ring that circumscribes the first end of the tube assembly and that is maintained by the retaining portion of the filter; and a first attachment portion.

Abstract: A valve seat/director unit the combines the functions of an injector valve seat and a separate spray director plate into an integral unit combining both functions. The unit is a generally flat plate having an outer portion with at least one sealing rib. A central portion includes at least one endless rib forming a valve seat and surrounding a spray director including a recessed area communicating with at least one fuel spray opening. Upper surfaces of the sealing rib(s) and valve seat are preferably flat and coplanar with one another for engagement by cooperating surfaces of an injector member and a valve member, respectively.

Abstract: A fuel injector for fuel injection systems of internal combustion engines has a valve needle (3) and, mechanically linked thereto, a valve closing body (4), which cooperates with a valve seat surface (6) disposed in a valve seat body (5) to form a sealing seat, and has a plurality of recesses (34), which are introduced in the valve seat body (5) downstream from the sealing seat. Situated downstream on the valve seat body (5) is a flow-through screen (31) in which, for each recess (34), at least one discharge orifice (7) is introduced, whose cross-section is smaller than that of the particular recess (34) and which is positioned such that its inlet cross-section is situated fully within the outlet cross-section of the particular recess (34).

Abstract: A poppet for a fuel injector having a head with one or more ducts that help reduce the formation of deposits on the head.

Abstract: A dual fuel injection valve separately and independently injects two different fuels into a combustion chamber of an internal combustion engine. A first fuel is delivered to the injection valve at injection pressure and a second fuel is either raised to injection pressure by an intensifier provided within the injection valve, or delivered to the injection valve at injection pressure. Electronically controlled valves control hydraulic pressure in control chambers disposed within the injection valve. The pressure of the hydraulic fluid in these control chambers is employed to independently actuate a hollow outer needle that controls the injection of the first fuel. Disposed within the outer needle is an inner needle that controls the injection of the second fuel. The outer needle closes against a seat associated with the injection valve body and the inner needle closes against a seat associated with the outer needle.

Abstract: In a fuel injection nozzle having a nozzle body, a nozzle needle that is displaceable in the nozzle body, a piezoelectric actuator that is connected to the nozzle needle, and a compensation piston on which the piezoelectric actuator is braced and which protrudes into a compensation chamber that is filled with a fluid, where the compensation chamber communicates with a supply volume through an inlet of small cross section, a simpler design is to be attained. To that end, it is provided that the supply volume is subjected to variable pressure making it possible to dispense with a separate restoring spring for the nozzle needle.

Abstract: A fuel injector for fuel injection system of an internal combustion engine includes a solenoid coil, an armature acted upon in a closing direction by a return spring, and a valve-closure member frictionally connected to the armature. The valve-closure member, together with a valve-seat surface, forms a sealing seat, the armature striking with an armature stop face against a magnetic-pole surface of a magnet body. The armature stop face includes a first annular, inner edge zone that adjoins an inner edge and is inclined inwardly with respect to a plane perpendicular to longitudinal axis of the armature, and has a second annular, outside edge zone that adjoins an outer edge and is inclined outwardly with respect to a plane perpendicular to the longitudinal axis of the armature.

Abstract: A fuel injection valve includes a valve seat member having a valve seat and a valve bore provided through a central portion of the valve seat, and an injector plate coupled to an outer end face of the valve seat member and having a plurality of fuel injection bores arranged in an annular shape surrounding an axis of the valve bore. A fuel diffusion chamber is defined between the valve seat member and the injector plate, and faced by the valve bore and all the fuel injection bores. The plurality of the fuel injection bores are formed in parallel to the axis of the valve bore, and the spreading angle of a fuel spray foam formed by the fuel injected from the fuel injection bores is determined depending on an axis distance between the valve bore and each of the fuel injection bores. Thus, it is possible to determine the spreading angle of the fuel spray foam as desired.

Abstract: Poppets for fuel injectors are provided with an improved sealing surface by making the poppet from a softer material than is known in the prior art. Instead of providing a Rockwell C hardness value of 50 or greater, as is known to those skilled in the art of poppet manufacture, the improved poppet is made of a softer material that allows the valve head of the poppet to wear in such a way that its shape conforms more accurately with a valve seat of the nozzle of a fuel injector. This also provides the beneficial result of improved salt water corrosion resistance. By using a softer metal to make the poppet, the improved sealing characteristic improves fuel efficiency of the engine and reduces emissions of undesirable compounds.

Abstract: In an electronic fuel injector used in a combustion system using gas fuel, the present invention suppresses wearing of worn portions to make control of stable supply of gas fuel possible by forming a surface reforming layer (nitrided layer etc.) having wear resistance on a surface of a structural material of worn portions of the electronic fuel injector.

Abstract: A fuel injector, especially a fuel injector for injection systems of internal combustion engines, includes a solenoid which works together with an armature and a valve needle to actuate a valve-closure member, which together with a valve-seat surface forms a sealing seat. A longitudinal axis of the valve needle is inclined by a prescribed angle with respect to a longitudinal axis of a valve housing. The armature is linked with an actuating body whose longitudinal axis is inclined with respect to the longitudinal axis of the valve needle and which acts on the valve needle through a hydraulic device.

Abstract: A fuel injector device having a blowback valve disposed in the injector body, the blowback valve having a first portion and a second portion, a fuel passage being disposed through the first and second portions, a closure member being disposed in the fuel passage and movable in a first direction and a second direction, the closure member permitting a predetermined volume of fuel flow in the second direction before the closure member moves to the second position. The invention also include a method to control the fuel flow through an injector by providing a body having a first portion and a second portion, a fuel passage extending through the portions and a closure member movable in the fuel passage between a first position and a second position, and the closure member permitting a predetermined volume of fuel to flow in one direction before the closure member moves to the second position.

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: An electrical actuator subassembly, preferably for use in a fuel injector, includes an externally threaded ferromagnetic metallic body, an internally threaded collar, an electrical actuator, an electrical connector, and a plastic cap. In one embodiment, the electrical actuator is a solenoid, while a piezoelectric actuator is used in a second embodiment. The electrical actuator directly controls a pilot valve member positioned between the metallic body and the injector body, and a needle valve which opens or closes a nozzle outlet at the bottom of the injector. The electrical actuator subassembly is attached to a fuel injector body by mating the external threads of the metallic body to the internal threads of the collar. The collar is attached to the injector body with a groove and snap ring configuration.

Abstract: A fuel injector (1) for fuel-injection systems of internal combustion engines includes an actuator (10), a valve needle (3), which is able to be activated by the actuator 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 a plurality of spray-discharge orifices (7) which is formed in the valve-seat member (5). At a discharge-side end (42) of the fuel injector (1), a nozzle-orifice cover (37) is positioned, which shields the spray-discharge orifices (7) from the combustion chamber of the internal combustion engine.

Abstract: A fuel injector (1) for fuel-injection systems of internal combustion engines includes an actuator (10), a valve needle (3), which is able to be activated by the actuator 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 one spray-discharge orifice (7) which is formed in the valve-seat member (5). At a downstream end (42) of the fuel injector (1), a flameproofing screen (37) is positioned, which shields the spray-discharge orifices (7) from the combustion chamber of the internal combustion engine.

Abstract: A fuel injector (1) for fuel-injection systems of internal combustion engines includes a valve needle (3) cooperating with a valve-seat surface (6) to form a sealing seat; and an armature (20) engaging with the valve needle (3), the armature (20) being axially moveable at the valve needle (3) and being damped, via a damping element (32), which is located in a recess (35) in a downstream-side end face (34) of the armature (20), with respect to a cup-shaped sleeve (31) positioned downstream from the armature (20) and joined to the valve needle (3) in force-locking manner. Furthermore, the fuel injector includes a filter element (25b), the filter element (25b) being positioned downstream from the armature (20) in the cup-shaped sleeve (31).

Abstract: A liquid injection apparatus 10 comprises an injection device 15, and an electro-magnetic injection valve 14 for ejecting pressurized fuel into the injection device. An ejection hole in the electro-magnetic injection valve is connected to a hollow cylindrical hermetically sealed space, which in turn is connected to a liquid ejection nozzle, through a liquid filling port, a liquid supply passage, and a chamber which are included in the injection device. By means of allowing the electro-magnetic injection valve to eject the pressurized fuel at an angle of inclination relative to the center axis of the hollow cylindrical hermetically sealed space, flows of fuel are produced across a wide area in the hermetically sealed space so that large-sized air bubbles are prevented from being formed in the hermetically sealed space.

Abstract: A fuel injector for an internal combustion engine is disclosed. The fuel injector includes a housing, a valve seat, a metering orifice, 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 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. The channel tapers outwardly from a large height to a smaller height toward the orifice openings.

Abstract: A fuel supply system has a pump, a common rail, and injectors. Pressurized fuel is stored in the common rail. The common rail distributes the fuel to the injectors. A liquid fuel and a liquefied gas fuel such as dimethyl ether and a liquefied petroleum gas may be used as a fuel. In each injector, a valve element is actuated directly by an electromagnetic actuator. The injector has a low pressure chamber for decreasing a biasing force which acts on the valve element in a valve closing direction. The valve element can be divided for replacement. The injector has means for suppressing the bounce of the valve element. A hydraulic unit which utilizes the fuel suppresses the bounce of the valve element. The fuel supply system is connected to a refrigerating cycle. The fuel leaking from the fuel supply system is cooled and again liquefied by the refrigerating cycle.

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 poppet type solenoid valve used in an electronically controllable vehicle hydraulic brake system is proposed which suppresses sound and vibration and simultaneously eliminates malfunction. For these effects, the following conditions have to be satisfied: FSP/(r2−B2)<67  (1) FSP·St2/(r2−B2)>29  (2) wherein FSP is the force of the spring, r is the tip diameter of the poppet, St is the stroke of the poppet, and B is the diameter of the area of the poppet where the valve-opening force by hydraulic pressure does not work on the poppet under the Bernoulli effect.

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 disposed within the tube; 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: In a fuel injection valve including a flat fuel diffusion chamber provided between a valve seat member and an injector plate to widen radially outwards from an outer end edge of a valve seat bore, an annular step is formed on a ceiling surface of the fuel diffusion chamber so that a level of the ceiling surface is gradually lowered radially outwards, and fuel injection orifices are disposed immediately below the step and at a distance from an inner peripheral wall of the fuel diffusion chamber. Thus, a fuel spread radially in the fuel diffusion chamber is allowed to collide with the annular step, leading to an enhancement in fuel diffusing effect, so that it is possible to further promote the atomization of the fuel injected from the fuel injection orifices and to form more stable fuel spray forms.

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.