Abstract: The electromagnetically operatable valve, in particular a fuel injector for fuel injection systems of internal combustion engines, has a magnetic circuit having a core, a solenoid, a bobbin accommodating the winding of the solenoid, an armature, which operates a valve closing body cooperating with a fixed valve seat and is drawn against the core when the solenoid is excited, and having an armature-side flow guide element. The bobbin is designed and situated in such a way that magnetic isolation between the core and the armature-side flow guide element is ensured. The valve is suitable in particular for use in fuel injection systems of mixture-compressing, externally ignited internal combustion engines.

Abstract: A fuel injector includes a solenoid coil, which cooperates with an armature acted upon by a restoring spring, the armature forming an axially displaceable valve part together with a valve needle. A valve-closure member, which forms a sealing seat together with a valve-seat body, is provided on the valve needle. Furthermore, a reliable sealing of a thin-walled valve sleeve or of the magnetic coil exists that is made of a sealing body that is secured beneath the magnetic coil. The sealing body is tetragonal in cross-section, in particular, it has a trapezoid-like shape, and is put in between the magnetic coil and a valve housing. In its installed state, the sealing body is clamped and compressed. In its compressed state, the sealing body assumes an elliptical or egg-shaped cross-section.

Abstract: A valve for metering a flowing medium, e.g., an injection valve for fuel-injection systems of internal combustion engines, is provided. In an embodiment, the valve has a sealing seat formed by a valve seat and a sealing head of a valve member able to be driven to execute lift motions. The valve has a plurality of spray orifices having hole-entry openings situated downstream from the sealing seat and sealable by the sealing seat. The valve has flow-through channels situated upstream from the sealing seat, which extend parallel to each other and discharge in front of the sealing seat. In order to achieve a unified upstream flow approach of all hole-entry openings of the spray orifices, e.g., if the number of spray orifices and flow-through channels differs, an upstream-flow shaper having at least one flow-through opening is situated between sealing seat and hole-entry openings of the spray orifices.

Abstract: A reagent injector with a cartridge design has a body with a reagent inlet, outlet, and a swirl chamber, which has an exit orifice that may be covered and uncovered by a solid, movable pintle. Reagent flows through the injector when the exit orifice is covered and uncovered to cool the injector. An insulator may be disposed between the injector body and a mounting flange connectable to an exhaust system. A flow path ensures cooling of an electromagnetic actuator. Reagent may bypass an orifice swirl chamber when the pintle blocks the exit orifice. Fluid may flow between an outside diameter of a pole piece and an inside diameter of an electromagnetic actuator, through an orifice chamber and return through a central bore housing a solid pintle, around which fluid may flow. Different inner injector body passages may direct fluid into an orifice distribution chamber and out to the solid pintle.

Abstract: In one aspect, a fuel injector includes an injector body that defines a fuel inlet, a drain outlet and a nozzle outlet. A direct operated check valve is positioned in the injector body and includes a needle valve member with an opening hydraulic surface exposed to fluid pressure in a nozzle supply passage, and a closing hydraulic surface exposed to fluid pressure in a needle control chamber. The needle valve member is movable between a first position at which the nozzle supply passage is blocked to the nozzle outlet, and a second position at which the nozzle supply passage is open to the nozzle outlet. A needle control valve is positioned in the injector body and includes a control valve member movable between a first position at which the needle control chamber is fluidly connected to the drain outlet, and a second position at which the needle control chamber is fluidly blocked to the drain outlet.

Abstract: In an electromagnetic fuel injection valve which is configured to absorb an unbalanced load applied to sliding portions between a fixed core and a valve stem, thereby enabling a reduction in a frictional resistance of the sliding portions, a guide bush is press fitted in an inner peripheral surface of the fixed core, the valve element includes a valve part configured to cooperate with the valve seat, and the valve stem continuously provided to the valve part and extending toward the guide bush, a sliding member configured to be slidably fitted to an inner peripheral surface of the guide bush is press fitted on the valve stem, wherein an annular gap is provided at least at one of a location between the fixed core and the guide bush and a location between the valve stem and the sliding member, within sliding regions of the guide bush and the sliding member.

Abstract: In an electromagnetic fuel injection valve, a valve housing includes: a cylinder-shaped valve seat member having a valve seat in its front end portion; a magnetic cylindrical body coaxially connected to a rear end portion of the valve seat member; a nonmagnetic cylindrical body coaxially and liquid-tightly welded to a rear end of the magnetic cylindrical body; and a hollow cylindrical stationary core coaxially and liquid-tightly welded to a rear end of the nonmagnetic cylindrical body. A valve assembly is housed in the valve housing and includes: a valve body capable of being seated on the valve seat; and a movable core connected to a rear end of the valve body and opposed to a front end of the stationary core. The valve body and the valve seat member are respectively made of different martensitic stainless steels so that a hardness of the valve body is higher than that of the valve seat member.

Abstract: An electromagnetically actuatable valve, e.g., a fuel injector for fuel injection systems, includes an electromagnetic actuating element having a solenoid, a fixed core, a valve jacket, and a movable armature for actuating a valve closing body, which cooperates with a valve seat surface provided on a valve seat body. In addition, the valve has a restoring spring for resetting the valve closing body to its resting position on the valve seat surface. The restoring spring and an internal longitudinal bore hole of the armature are paired in such a way that the armature is guided during its axial movement only along the restoring spring.

Abstract: An injector (10) includes a valve body (16), an armature tube (20) in the valve body, a seal disk (24) carried by the armature tube, a spring (30) associated with the seal disk, a seat (34) defining an outlet. The seat includes a seat surface (38) engaged with the seal disk that is biased by the spring, when the injector is in a closed position, preventing fuel from exiting the outlet. A movable armature (42) is coupled to an end of the armature tube. An adjusting tube (48) engages an end of the spring. An inlet tube (50) defining an inlet has an end surface that is spaced from the periphery of the armature in the closed position. An electromagnetic coil (58) is disposed about a portion of the inlet tube. A flux member (60) is associated with the coil. A housing (62) covers at least a portion of coil.

Abstract: An injector (10) includes a valve body (16) having an interior portion (18) and a seat (32). An armature tube (20) is in the interior portion. A spring (28) biases a valve member (24) into engagement with the seat. A movable armature (40) is coupled to the armature tube. A calibration member (36) is engaged with the valve member and engaged with the spring. A stator (52) is coupled to an inlet tube (41) and has an end surface spaced from an end surface of the armature in the closed position of the injector, thereby defining an air gap (54) between the end surfaces. A coil (56) is disposed about a portion of the inlet tube. A housing (64) surrounds at least a portion of the coil. Magnetic flux causes the armature and armature tube to push the valve member off the seat.

Abstract: A fuel injector includes an injector body with a tip component that defines at least one nozzle outlet. A needle valve member is positioned in the injector body and includes a frustoconical segment positioned in a frustoconical bore to separate a needle control chamber from a nozzle chamber. The needle valve member includes an opening hydraulic surface exposed to fluid pressure in the nozzle chamber, and a closing hydraulic surface exposed to fluid pressure in the needle control chamber. The frustoconical bore and the frustoconical segment have a narrowing taper in the direction of an injector tip. The frustoconical features tend to slow the initial opening of the nozzle outlets, and hasten their closure relative to a counterpart injector with cylindrical needle guide features.

Abstract: A fuel injector for fuel ignition systems of internal combustion engines includes a magnetic circuit having a core, a magnetic coil and an armature, and a movable valve needle, which has a valve-closure member that cooperates with a fixed valve seat, the valve seat being shaped on a valve-seat member and being provided with a valve-seat support in which the valve-seat member is inserted. At least one metallic component of the fuel injector, in this context, has a serrated structure on its outer circumference for producing a solid connection to a corresponding component made of plastic. The plastic components may be the connection piece, the valve-seat support, the coil shell and the connecting pipe of the valve needle. The fuel injector is particularly suitable for use in fuel-injection systems of mixture-compressing internal combustion engines having externally supplied ignition.

Abstract: A fuel injection valve for an internal combustion engine is provided. The fuel injection value includes an injection hole plate having a plurality of fuel chambers formed by recessing part of the upstream side of the injection hole plate at a plurality of positions along the valve seat opening portion Each of the fuel chambers has a shape in which the halves are symmetric with each other with respect to a line that radially extends from the center of the injection hole plate. The fuel chambers are is disposed in a place that ranges from the inside of a virtual circle to the outside of the inner circumference of the valve seat opening portion. Two injection holes are arranged outside the inner circumference of the valve seat opening portion in such a way as to flank the radial center line of the fuel chamber.

Abstract: A fuel injector that includes a flying armature movable relative to a pintle stop, and an electromagnetic circuit configured to move the flying armature away from the pintle stop prior to accelerating the armature toward the pintle stop as part of moving the pintle to open the fuel injector. The flying armature increases the total force applied to the pintle to open the fuel injector by supplementing the static force imparted to the armature by a magnetic field with an impact force imparted by the armature being in motion toward and impacting with the pintle stop. The arrangement of magnetic circuit devices and materials used to make the magnetic circuit devices cooperate to provide a reversing force that urges the armature away from before urging the armature toward the pintle stop, and increases the rate at which the force that urges the armature toward the pintle stop increases.

Abstract: A housing for an armature of a fuel injector, a fuel injector and a fuel injection system are disclosed. The armature housing includes a first cylindrical portion for slidably accommodating the armature pin. The first cylindrical portion has a minimum inner diameter that is closely matched to the maximum outer diameter of the armature pin. A second cylindrical portion of the armature housing accommodates the armature. The second cylindrical portion has an inner minimum diameter that is closely matched to the maximum outer diameter of the armature. The disclosed armature housing provides more reliable and more consistent movement of the armature.

Abstract: A fluid injection valve having an inlet which is set up to receive fluid from a supply line and is connected to a chamber, a fluid outlet which is connected to the chamber, is set up to allow fluid to flow out of the fluid injection valve and has a valve arrangement having a valve seat and a valve element, wherein the valve element is set up to perform opening and closing movements relative to the valve seat, a linear actuator which is set up to move the valve element relative to the valve seat, and a spring arrangement which exerts on the valve element a force which is dependent on the fluid pressure prevailing in the chamber.

Abstract: A valve assembly including an armature and a valve member that are coupled when the solenoid coil is de-energized but are decoupled after the solenoid coil is energized. A first spring biases the armature and the valve member to a closed valve seat position while a second spring having a smaller preload than the first spring biases the valve member to an open valve seat position. When the solenoid coil is energized, the magnetic force of the coil overcomes the force exerted by the first spring pulling the armature away from the valve member. The valve member moves to the open valve seat position by the force exerted by the second spring. When the coil is de-energized, the magnetic force decays, thereby allowing the armature and the valve member to re-couple.

Abstract: A fuel injector that includes a sliding armature, decoupled armature, or flying armature movable between a pintle stop and a housing stop. Flying armatures are generally used to increase the total force applied to the pintle stop for lifting the pintle off a nozzle seat to open the fuel injector. When the fuel injector is turned off, a housing stop is arranged to absorb kinetic energy present in the flying armature so that the kinetic energy is not imparted to the nozzle seat.

Abstract: A fuel injector apparatus comprising a piezoelectric driving stack and injector assembly wherein a flow control member of the fuel injector apparatus is driven directly by the piezoelectric stack without additional amplification means or interposing elements while the flow area of the nozzle portion is variably adjustable to deliver controlled flow rates in a desired flow profile to improve engine performance and reduce emissions. The injector configuration is adapted to support required flow rates with minimal linear movement of the flow control member.

Abstract: A valve unit is disclosed for the interruption or release of a pressurized flow of a medium along a hollow duct, which flows along the hollow duct, as well as a preferred use of the valve unit in a dosing system and a method for the metered discharge of a medium from a cartridge-needle configuration, with a cartridge connected to the needle configuration via at least one hollow duct with an open cartridge end, to which a pressurizing means is applied, which is capable of driving the medium provided inside the cartridge in the direction of the needle configuration for discharge by applying pressure.

Abstract: An electromagnetically operatable valve, in particular a fuel injector for fuel injection systems of internal combustion engines, includes a magnetic circuit having a core, a solenoid, an armature, which operates a valve closing body cooperating with a fixed valve seat and is drawn against the core when the solenoid is excited, and is held on the valve closing body by a closing body carrier representing a part of a valve needle. The spherical valve closing body is secured on the closing body carrier in a non-positive manner due to the shape of the corresponding connecting surfaces. The valve is suitable in particular for use in fuel injection systems of mixture-compressing, externally ignited internal combustion engines.

Abstract: In a fuel injection valve having a valve plug for opening and closing a valve seat in which fuel is injected from a plurality of orifices provided in an orifice plate mounted at the downstream side of the valve seat by operating the valve plug in response to an operation signal from a controller, a thin wall part is provided by concaving a center portion of an upstream-side end face of the orifice plate to the downstream side by press working, and the orifice plate is disposed so that a virtual circular conical surface extending to the downstream side of the valve seat surface and an upstream-side end face of the orifice plate of the outer peripheral side of the thin wall part intersect to each other to form one virtual circle.

Abstract: A fuel injection valve has a valve body for opening and closing a valve seat, and receives an operation signal from a control unit to operate the valve body so that fuel is injected from a plurality of injection holes formed in an injection hole plate welded through a welded portion to a downstream side of the valve seat while passing through a gap between the valve body and the valve seat. The injection hole plate is formed at its central portion with a convex portion which is substantially axisymmetric with respect to a valve seat axis and which has a circular-arc shaped cross section, and the welded portion is also substantially axisymmetric with respect to the valve seat axis.

Abstract: A solenoid valve for a brake system enabling miniaturization of the valve and having an improved configuration to facilitate assembly and production of the valve. The solenoid valve includes an armature provided at one end thereof with an opening/closing member, a valve housing including a hollow first valve block fixed in a modulator block and a second valve block disposed below the first valve block and having an inlet for introduction of fluid, a valve seat installed in the first valve block and having a flow-hole to be opened or closed by the opening/closing member and a hollow extending longitudinally from the flow-hole, and an orifice sleeve located in the second valve block to define a fluid discharge passage and having an orifice formed in one end thereof to communicate with the hollow of the valve seat.

Abstract: In an electromagnetic fuel injection valve in which: a suction tubular part projecting toward an inside of a nonmagnetic cylindrical body is provided to a front end portion of a stationary core; and a front end of the suction tubular part and a rear end of a movable core are opposed to each other in the inside of the nonmagnetic cylindrical body, an annular gap allowing influx of pressure fluid used for a check of liquid-tightness between the nonmagnetic cylindrical body and the stationary core is provided between an outer peripheral surface of the suction tubular part and an inner peripheral surface of the nonmagnetic cylindrical body. Accordingly, it enables a quick and efficient judgment to be made on a check on liquid-tightness of a welded part by applying fluid pressure to the inside of the valve housing after the valve housing of the electromagnetic fuel injection valve is produced.

Abstract: In a fuel injection nozzle for an internal combustion engine, a first cavity is disposed downstream of a valve seat in a direction in which fuel flows. A second cavity is disposed downstream of the first cavity in the direction in which the fuel flows. A fuel passage connects the first cavity to the second cavity. Fuel injection holes (24) lead to the second cavity. With this configuration, when the fuel flows through the first fuel passage, cavitation is induced. Cavitation bubbles flow into the second cavity along with the fuel. When the fuel is retained in the second cavity, the cavitation bubbles are uniformly mixed into the fuel. The fuel, which has been sufficiently mixed with the cavitation bubbles, is injected from the fuel injection holes.

Abstract: A fluid injector has a valve body with a recess in which a valve needle is arranged axially movable preventing a fluid flow and being mechanically coupled to an axial end of a first spring preloaded to exert a force on the valve needle. A first armature is mechanically coupled to the valve needle. A second armature is arranged in the recess axially movable away and towards a protrusion of the valve body mechanically coupled to an axial end of a second spring preloaded exerting a force on the second armature which is arranged and designed such that from a closing to a first given position, the first and second armature are mechanically decoupled, and from the first given position further away from the closing position, the first and second armature are mechanically coupled. A solenoid drive magnetically actuates the first and second armature to move axially.

Abstract: An electromagnetic fuel injection valve comprising: a metallic cylindrical-shaped vessel provided at a tip end thereof with a fuel injection port, the other end thereof being closed by a stationary core provided centrally thereof with a through-hole; a movable member arranged between the stationary core and the fuel injection port and provided at a tip end thereof with a valve element, which opens and closes the fuel injection port, a maximum outside diameter of the movable member being smaller than a minimum inside diameter of the through-hole; and an electromagnetic drive mechanism that reciprocates the movable member.

Abstract: The objective of the present invention is to realize the structure, of a fuel injection valve, in which bouncing of the needle can be suppressed and the armature position can be fixed while the valve is closed, without increasing the number of components and the number of processes. In a fuel injection valve including an armature that is repelled or attracted by a core, by de-energizing or energizing a coil; a needle that opens or closes a valve seat in accordance with a reciprocal travel of the armature; and a valve-closing spring that biases the needle so as to close the valve, when the coil is de-energized, the needle and the armature are fixed in such a way that the armature can travel in an axis direction by a predetermined amount with respect to the needle, and the coil is preliminarily energized while the fuel injection valve is closed by the needle.

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 injection valve includes a valve main body of a hollow tubular shape, a needle valve provided to the valve main body in a slidable manner, a valve seat opposing the needle valve to form a seat portion and having an injection hole formed downstream of the seat portion, and a guide portion provided upstream of the seat portion to guide the needle valve. An annular passage communicating in a circumferential direction is defined between the inner peripheral surface of the valve main body and the outer peripheral surface of the guide portion and a fuel passage through which to introduce a fuel from the annular passage to the seat portion is defined. An almost cylindrical filter to trap foreign matter heading toward the fuel passage is provided to the annular passage.

Abstract: A fuel injector may include a housing, a pintle nozzle assembly and an actuation assembly. The housing may define a longitudinal bore, a high pressure fuel duct in communication with the longitudinal bore and a valve seat including a valve seat surface and an aperture. The pintle nozzle assembly may include a stem and a pintle and may be at least partially disposed within the longitudinal bore and be variably displaceable between a first position and a second position. In the first position, the pintle nozzle assembly may abut the valve seat to seal the aperture. In the second position, the pintle nozzle assembly may be displaced from the valve seat to open the aperture. The actuation assembly may be coupled with the pintle nozzle assembly and operate to move the pintle nozzle assembly to a plurality of positions between the first position and the second position.

Abstract: A fuel injection valve comprises a convex portion prominently formed on an outer end surface of a nozzle body, stepped recesses each of which has plural steps formed by press forming on the convex portion, and multi orifices as fuel nozzle holes formed by press forming so that an outlet of each of the orifices is located at a bottom face of each of the stepped recesses. Furthermore, the fuel injection valve has plural sets each of which comprises one of the stepped recesses and the relevant orifice, the orifices incline to each other, and a step on a downstream side in each of the stepped recesses has a larger diameter than a step on an upstream side thereof.

Abstract: A solenoid actuated device such as a fuel injector includes an actuator body having a plurality of body pieces, and a single-pole solenoid actuator assembly positioned at least partially within the actuator body. The single-pole solenoid actuator assembly includes a one-piece compound armature housing having a load carrying component clamped between the first body piece and the second body piece, and a flux carrying component. The load carrying component includes a high structural strength and a low flux permeability, and the flux carrying component includes a low structural strength and a high flux permeability. A method of making a solenoid actuated device includes placing an armature at a sliding radial air gap with a flux carrying component of a one-piece compound armature housing, and establishing a structural load path by placing a load carrying component of the compound armature housing between a first actuator body piece and a second actuator body piece.

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 metering servovalve for a fuel injector of an internal combustion engine has an electro-actuator and a fixed valve body, which defines a control chamber communicating with an inlet and with an outlet channel. The outlet channel has at least one calibrated restriction and exits through the lateral surface of an axial stem, on which a sleeve slides, in a substantially fluid-tight manner, to open/close the outlet channel and so vary the pressure in the control chamber. The outlet channel is closed by an end portion of the sleeve that is elastically deformable in a radially outward direction, under the thrust of the fuel pressure, to increase the diameter at which the seal against the valve body is formed, with respect to a non-deformed state, and to generate an axial unbalancing force on the sleeve upon opening when the outlet channel is closed.

Abstract: A fuel injection valve includes a housing, a stator, a movable core, a coil, a nozzle hole, a valve member, and at least one communicating passage. The housing receives the stator and movable core. An end face of the movable core has a non-contact surface and a contact surface. The non-contact surface and the stator define a space when the contact surface contacts the stator. The valve member is slidably received in a bore of the movable core. The valve member has a stopper engageable with the movable core such that the valve member is axially movable together with the movable core. The at least one communicating passage connects the space with a corresponding one of a first fuel passage and a second fuel passage of the housing.

Abstract: An embodiment of a fuel injector comprising: an injection valve provided with a mobile needle for regulating the fuel flow through an injection nozzle; a supporting body having a tubular shaft and displaying a feeding channel which ends with the injection valve; and an electromagnetic actuator comprising a spring which tends to maintain the needle in a closing position and an electromagnet, which comprises a coil arranged outside the supporting body, a fixed magnetic armature arranged within the supporting body, and a keeper which is arranged within the supporting body, is magnetically attracted by the magnetic armature against the bias of the spring, and is mechanically connected to the needle; the coil displaying a toroidal shape having an internal annular surface, which is directly in contact with an external surface of the supporting body without the interposition of any intermediate element.

Abstract: A servo valve (7) for fuel control is provided with an actuator (14) and a valve body (8, 28), which is set in a fixed position and has a stem (33) that extends along a longitudinal axis (3) and defines an internal passage (26); said internal passage (26) has at least two radial channels (39), which give out into an outlet through an outer lateral surface (34) of the stem (33) and have respective first portions (43) of calibrated length and cross section; said first portions (42) are followed by respective second portions of larger diameter; the servo valve (7) is provided with an open/close element (17), which is coupled to the outer lateral surface (34) of the stem (33) substantially in a fluid-tight way and is axially movable under the action of the actuator (14) for opening/closing the internal passage (26) of the stem (33); in the closing position, the open/close element (17) is subject to a zero axial resultant force by the pressure of the fuel.

Abstract: A fuel injection valve includes a main body having a nozzle hole and a compression chamber. The main body accommodates a compression unit for pressurizing fuel accumulated in the compression chamber. The fuel injection valve further includes a valve element being axially movable in the main body. The valve element includes a valve portion and a pressure-receiving portion. The valve portion is movable in an opening direction to open the nozzle hole in response to pressure of fuel being pressurized by the compression unit and applied to the pressure-receiving portion. A regulating unit is provided in the compression chamber for regulating movement of the valve element with respect to the opening direction.

Abstract: In an injector used for an internal combustion engine, a favorable magnetic attraction force is obtained to reduce a controllable minimum injection amount of a fuel injection amount. In a fuel injection valve in which a fixed core and a moving element is contained inside a pipe-shaped member, and a coil and a yoke are provided on an outer side thereof, a space for placing the coil is placed so that an inner circumference length in a vertical section of the space becomes smaller than an outside diameter of the yoke, or a height of the space in an axial direction of the fixed core becomes smaller than a diameter of the fixed core.

Abstract: A fuel injector for fuel-injection systems of internal combustion engines includes a solenoid coil, a tubular support acting as inner pole of the solenoid coil, and a filter element, the filter element being press-fitted with an outer contour of the tubular support of the fuel injector.

Abstract: A valve assembly including a valve element and a movable core is housed in a valve housing including a valve seat member, a magnetic cylinder, a nonmagnetic collar and a stationary core. A coil assembly is disposed on an outer periphery of the stationary core, and housed in a coil housing. The coil housing has a front end wall part which is formed such that a thickness thereof in an axial direction is larger than a thickness of its shell part in a radial direction. A magnetic path forming part is formed by the front end wall part and a rear-side cylinder part of the magnetic cylinder which is fitted to an inner peripheral surface of the front end wall part. The magnetic path forming part surrounds the movable core substantially by the entirety of its inner peripheral surface to magnetically connect the movable core and the shell part to each other. A positioning step part is formed at a rear end of the magnetic cylinder so as to support a front end of the magnetic assembly.

Abstract: An electromagnetic fuel injection valve is provided in which a cylindrical magnetic body is welded to a valve seat member having at the rear end thereof a tubular press-fit portion press-fitted into a front portion of the cylindrical magnetic body, a valve body is housed in the valve seat member while being spring-biased in a direction that seats the valve body on a valve seat, and a movable core facing a fixed core is coaxially connected to the valve body, wherein the valve seat member (10) includes the tubular press-fit portion (10a), a large diameter portion (10b) that has substantially the same outer diameter as the outer diameter of the cylindrical magnetic body (9), and an annular shoulder portion (10c) that is formed as a flat face perpendicular to the outer peripheral face of the tubular press-fit portion (10a) and provides a connection between the tubular press-fit portion (10a) and the large diameter portion (10b), an annular abutment receiving face (9a) at the front end of the cylindrical magnetic

Abstract: An electromagnetic fuel injection valve in which a first resin-molded layer that is made of a synthetic resin, covers a solenoid section, and forms a coupler main portion that defines a coupler is covered by a second resin-molded layer different from that of the first resin-molded layer so that an outer face of the coupler main portion is exposed from a middle part up to the extremity of the coupler main portion. An endless engagement groove is provided on the outer periphery of the middle pad of the coupler main portion of the first resin-molded layer, the second resin-molded layer engaging with the endless engagement groove. An extending portion extending further outward than the engagement groove is formed in the second resin-molded layer so that the extending portion makes contact with an outer face of the coupler main portion when in a non-engaged state and covers the coupler main portion.

Abstract: A fuel injection valve in which a valve element is formed at a distal end thereof with a flat portion 13c which is substantially parallel with an injection hole plate 11, injection hole entrances 12a are arranged inside an imaginary envelop 15 along an intersection between an extension 10b of a downstream inner wall of a seat portion of a valve seat and an upstream plane 11c of the injection hole plate and outside the flat plane at the distal end of the valve element, and the relation between the vertical distance h between the flat plane at the distal end of the valve element and the upstream plane of the injection hole plate with the valve opened and the diameter d of the injection hole entrance is h<d, and the injection hole 12 is formed to be inclined by a predetermined angle with respect to the direction of the thickness of the injection hole plate.

Abstract: A fuel injector for the direct injection of fuel into a combustion chamber of an internal combustion engine includes an energizable actuator, a valve needle, which is in operative connection with the actuator and acted upon by a restoring spring in a closing direction to actuate a valve-closure member, which forms a sealing seat together with a valve-seat surface formed at a valve-seat body. The valve-seat body includes at least two spray-discharge orifices. The pressure of the fuel flowing through the fuel injector is greater than 10 bar.

Abstract: In an electromagnetic fuel injection valve designed so that the contact of a movable attraction face at a rear end of a movable core with a stationary attraction face included at a front end of a stationary core is inhibited, a ring-shaped stopper (28) made of a material non-magnetic or magnetic weakly more than a movable core (18) is press-fitted into an inner periphery of a rear portion of the movable core (18), and a flat abutment face (51), which is disposed at a location displaced from a flat movable attraction face (41) formed at the rear end of the movable core (18) toward a stationary attraction face (42), is formed at a rear end of the stopper (28) to be able to abut against the stationary attraction face. A slant (52) is formed on an inner periphery of the rear end of the movable core (18) and an outer periphery of the rear end of the stopper (28) to continuously and smoothly connect the movable attraction face (41) and the abutment face (51) to each other.

Abstract: A solenoid operated gaseous fuel injector includes a pole positioned axially movable within a fuel tube, a retaining ring axially retaining a first end of the pole, a spring element positioned in contact with a second end of said pole, and an armature transmitting a force onto said pole at impact. The gaseous fuel injector operates to effectively attenuate and dissipate armature impact force onto the pole. Accordingly, impact energy attenuation is attained while cold temperature stiction of the moving parts is avoided.

Abstract: A fuel injector includes first and second electrical actuators positioned within an injector body. First and second pairs of electrical conductors extend from a socket connector outside of the injector body to the first and second electrical actuators, respectively. The electrical conductors extend through an elastomeric sealing member that seals against fuel leakage from the fuel injector. The elastomeric sealing member provides annular sealing ridges in sealing contact with an access passage of the injector body and includes individual conductor seal passages that form seals around the outer surface of the individual electrical conductors. The elastomeric sealing member includes features that facilitate assembly of the fuel injector in a manner that reduces risk of damage to the sealing strategy.