Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
  • F02M63/0012—Valves
  • F02M63/0014—Valves characterised by the valve actuating means
  • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
  • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
  • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
  • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
  • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
  • F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
  • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
  • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
  • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
  • F02M55/004—Joints; Sealings

Definitions

• the present invention relates to a
• a fuel injection valve is known for example from DE 10121340 Al. It has a housing body and a nozzle body which is pressed against the end face sealingly thereon by means of a union nut. This limits a high-pressure chamber, which is connected to a arranged on the housing body high-pressure fuel inlet and with an injection valve seat on the nozzle body.
• a longitudinally adjustable injection valve member which interacts on the one hand with the injection valve seat and, on the other hand, delimits, in the manner of a piston, a control chamber connected to the high-pressure chamber via a throttle admission.
• the control chamber is further limited by a groove-like support body, in which engages the injection valve member and on which it is mounted in sliding fit.
• a closing spring is supported on the one hand on the valve member and on the other hand on the support body, which is held by the force of the spring on the housing body in abutment.
• An actuator controlled by an actuator Pilot valve member cooperates with a pilot valve seat formed on the support body.
• a fuel injection valve according to claim 1 allows such a short axial formation of the nozzle body, that he finds place together with a cap nut in a passage of a cylinder head of the internal combustion engine, and yet protrudes only slightly in a known manner via the cylinder head into the respective combustion chamber.
• the housing body has a recess which opens in the direction of the nozzle body and has a conical taper in the end region facing away from the nozzle body.
• the recess of the support body engages, where it is held by means of the closing spring sealingly in contact with the rejuvenation.
• a particularly preferred embodiment of the fuel injection valve according to the invention is specified in claim 6. Since the support body has a conical end region whose cone angle is greater, but preferably only slightly larger than the cone angle of the taper of the recess in the housing body, a very ' narrow truncated cone-shaped sealing surface is achieved, whereby a particularly reliable sealing effect is ensured. Since the sealing surface comes to rest on a large radius of the cones, hydraulic forces acting in the lifting direction are minimized.
• An outlet throttle insert on which a pilot valve seat is formed may be made of a particularly durable material, while a housing body may be made of a different, cheaper material.
• FIG. 1 is a longitudinal sectional view of a fuel injection valve, in which a support body rests planar on a housing body, an actuator assembly with respect to an injection valve member is arranged in the housing body desaxiert and this receives a AuslassdrosselURI, at which a
• Pilot valve seat of a controlled by the actuator pilot valve is formed
• FIG. 2 shows a longitudinal section of a part of an inventive injection valve with a recess which has a conical taper deep in the housing body, in which the support body engages with a conical end region; 3 likewise in longitudinal section a part of a second embodiment of the fuel injection valve according to the invention of a particularly short overall length;
• FIG. 4 shows a longitudinal section of part of a third embodiment of the fuel injection valve according to the invention, in which the support body has a dome-shaped, cooperating with the conical taper in the housing body end portion, and in which integrally formed on the support body, a guide sleeve for the injection valve member;
• FIG. 5 in longitudinal section a part of a fourth embodiment of the inventive
• the closing spring is supported on a control piston abutting the support body and engages in a cylinder-like portion of the injection valve member;
• FIG. 1 shows a fuel injection valve 4, which is intended for the intermittent injection of fuel into the combustion chamber 6 of an internal combustion engine 8. It has an elongated outer housing substantially in the form of a stepped circular cylinder having housing 10 whose housing axis is denoted by 12.
• the housing 10 consists of a one-piece housing body 14, a one-piece intermediate body 15 and a one-piece nozzle body 16.
• the intermediate body 15 is held by means of a threaded onto the housing body 14, designed as a cap nut clamping nut 18 in sealing engagement with an axial end face 20 of the housing body 14, while the nozzle body 16 is held by means of a threaded onto the intermediate body 15 cap nut 19 on an axial end face of the intermediate body 15 in sealing engagement.
• the intermediate body 15 and the nozzle body 16 define a high-pressure chamber 22, which extends from the end face 20 of the housing body 14 in the direction of the housing axis 12 to a nozzle tip 24 of the nozzle body 16, where on the nozzle body 16, a truncated cone-shaped injection valve seat 26 is formed.
• the nozzle body 16 in the region of the nozzle tip 24 in a known manner nozzle openings 28, through which the fuel is injected into the combustion chamber 6 when the fuel injection valve is open.
• the high-pressure chamber 22 is connected to a high-pressure fuel inlet 32 at a free end side 20 'of the housing body 14 via a fuel feed channel 30, which extends in the intermediate body 15 obliquely to the housing axis 12 and through the housing body 14 parallel to the housing axis 12 and with respect to this.
• a fuel feed channel 30 which extends in the intermediate body 15 obliquely to the housing axis 12 and through the housing body 14 parallel to the housing axis 12 and with respect to this.
• Fuel high pressure inlet 32 is connected in a known manner to a fuel feed which supplies fuel to the fuel injector at very high pressure of, for example, 1600 bar or higher.
• the fuel supply channel 30 opens in the intermediate body 15 in a circumferential groove-like extension of the high-pressure chamber 22nd
• a needle-shaped injection valve member 34 In the high-pressure chamber 22 is located, the housing axis 12 concentrically, a needle-shaped injection valve member 34, on the one hand interacts with the injection valve seat 26 and on the other hand, with a piston-like end portion 36 in the manner of a double-acting piston in a one cylinder forming one guide sleeve 38 in a close sliding fit of approximately 0.002 - 0.010 mm in the direction of the housing axis 12 is slidably guided.
• a closing spring 40 arranged concentrically around the injection valve member 34 is supported at one end by a support disk 42 and a support collar 44 in a known manner against a circumferential shoulder of the injection valve member 34 and acts upon this with a closing force directed toward the injection valve seat 26.
• the closing spring 40 is supported on a first end face 46 of the guide sleeve 38 which abuts with its opposite second end face 46 "on a support body 48.
• the pillar-like shaped support body 48 by the force of the closing spring 40 on the end face 20 of the housing body 14 in held sealing system.
• the guide sleeve 38 Adjacent to the support body 48, the guide sleeve 38 in the radial direction projecting centering ribs 50, by means of which they relative to the intermediate body 15th centered.
• the guide sleeve 38 to its centering with respect to the intermediate body 15 on the first end face 46 projecting and the this-sided end portion of the closing spring 40 centering comprehensive guide ring 50 'on. Since the centering ribs 50 and the centering ring 50 'in the axial direction are widely spaced from each other and the piston-like end portion 36 is designed to guide the guide sleeve 38 in the direction of the housing axis 12 long, can on a direct guidance of the injection valve member 34 on the intermediate body 15 or nozzle body 16th be waived.
• annular gap is present between the guide sleeve 38 and the nozzle body 16.
• the guide sleeve 38 has in the vicinity of the first end face 46 on radial passages 52 'to connect said gap hydraulically with the lying between the guide sleeve 38 and the injection valve seat 26 part of the high-pressure chamber 22.
• said gap between the intermediate body 15 and the guide sleeve 38 ensures the fuel supply to fuel inlet channels 54 in the support body 48.
• This has in a adjacent to the guide sleeve 38 section a smaller outer diameter, as in a housing body 14 facing portion or alternatively milled Wells.
• the said housing body 14 facing portion serves to center the support body 48 relative to the intermediate body 15.
• the fuel inlet passages 54 are formed by extending from the section with smaller outer radius or milled depressions radial blind holes and in this of the injection valve seat 26 facing end side leading axial holes , Next leads from the bottom of one of the blind holes a blind bore 56 in a concentric with the housing axis 12 through the support body 48 extending therethrough portion of a control channel 58th
• this has a larger clearance to accommodate an intermediate valve body 62, in the direction of the housing axis 12 by a small stroke, movable.
• the intermediate valve body 62 cooperates with a formed on the support body 48 annular intermediate valve seat 64, in the region of the fuel inlet channels 54 open.
• the control passage 58 is connected to the high-pressure space 22 via the gap between the support body 48 and the intermediate valve body 62 and the fuel inlet passages 54.
• the section of the control channel 58 extending through the intermediate valve body 62 opens into a control chamber 70, which is bounded on the periphery by the guide sleeve 38 and in the axial direction on the one hand by the injection valve member 34 and on the other hand by the intermediate valve body 62.
• a circular cylindrical recess 76 is accommodated in the housing body 14, coaxial with the substantially circular cylindrical Aktuatorfactausnaturalung 72.
• a circular-cylindrical outlet throttle insert 78 which is pressed in the direction of the actuator receiving recess 72 by means of a disk spring 80 which is supported on the housing body 14, is used with this peripheral play.
• Aktuatorareaaus Principleung 72 is a known electromagnetic actuator 84 for controlling the Fuel injection valve 10 is arranged via a pilot valve 86.
• a pilot valve seat 88 formed on the end face of the outlet throttle insert 78 facing the actuator 84 and running around the mouth of the control passage 58 cooperates with a shaft-like pilot valve member 90.
• the pilot valve member 90 is arranged in a continuous recess of a sealing element 92 and guided with radially projecting ribs on the sealing element 92 in the axial direction movable.
• the sealing element 92 bears with an annular front-side sealing surface both at the bottom 74 of the Aktuatorfactaus Principleung 72, and at the Auslassdrosseltiv 78 - radially outside the pilot valve seat 88 - sealingly.
• the force leading to the sealing engagement of the outlet throttle insert 78 is ensured by the plate spring 80 and by the hydraulic force exerted by the fuel in the high-pressure chamber 22.
• the force for the sealing engagement of the sealing element 92 on the bottom 74 is generated by a threaded into the housing body 14 ring nut 94, which holds the other hand, the sealing member 92 adjacent actuator 84 in the direction against the bottom 74.
• the actuator 84 has an actuating shaft 96 cooperating with the pilot valve member 90, to which a plate-like armature 98 is attached.
• a plate-like armature 98 By electrical excitation of a winding 100 of the armature 98 and thus the operating shaft 96 is tightened against the force of acting in the direction of the closed position of the pilot valve 86 actuator spring 102, which leads to the opening of the pilot valve 86.
• the pilot valve 86 is closed by means of the actuator spring 102.
• the guide recess for the pilot valve member 90 in the sealing member 92 is part of a Niederbuchauslasskanals 104 extending through the sealing member 92 and the operating shaft 96 through a, the actuator spring 102 receiving low-pressure chamber 106 and from there through a radially through the housing of the actuator 84 and the housing body 14 extends to a low pressure outlet from which the fuel is recycled in a known manner into a fuel reservoir.
• the intermediate body 15 has an annular support shoulder 107 on which the clamping nut 18 sealingly abuts with a counter-shoulder.
• a free, flat, annular end face 18 'of the cap nut is designed as a sealing surface. In the state mounted on the internal combustion engine 8, this sealing surface bears against a disk-shaped sealing ring 142, for example made of copper, which in turn bears against a flat annular counter-sealing surface 146 formed on a cylinder head 144 of the internal combustion engine 8.
• the housing body 14 is clamped in a well-known manner, for example by means of clamping screws, against the cylinder head 144, so that the intermediate body 15 in cooperation with the clamping nut 18, the sealing ring 142 and the cylinder head 144 of this and a cylinder of the internal combustion engine 8 limited combustion chamber 6 seals against the environment.
• the nozzle body 16 together with the union nut 19 find the cylinder space side of the sealing surface formed as a face 18 'of the clamping nut 18 and the
• the nozzle body 16 projects only slightly with its nozzle tip 24 above the cylinder head 144 into the combustion chamber 6.
• the relatively small nozzle body 16 made of a more wear-resistant and therefore much more expensive material than the rest of the housing 10 can be produced economically, which advantageously increases the life of the fuel injection valve 4.
• a circular cylindrical inner surface 19 'of the cap nut 19 has the function to align the nozzle body 16 on the housing axis 12. With this inner surface 19 'cooperating outer surfaces 15', 16 'of the intermediate body 15 and the nozzle body 16 have a fit of a few hundredths of a millimeter, typically 0.01-0.05 mm.
• the nozzle body 16 is arranged indirectly above the intermediate body 15 in a sealing manner on the housing body 14.
• the Matterschsmutter 19 is located at a small axial distance from acting as a sealing surface end face 18 'of the cap nut 18th
• the same reference numerals are used for the corresponding parts as described above in connection with the description of the fuel injector 4 shown in FIG. 1. Further, only the differences from FIGS 1 fuel injection valve 4 or the already previously described embodiments set forth.
• the high-pressure chamber 22 extends into the housing body 14 through a recess 108, which is coaxial with the housing axis 12 and opens toward the intermediate body 15 and nozzle body 16.
• This recess 108 is provided in the region of its bottom with a conical taper 110. From its high-pressure chamber 22 facing away from the tapered end of the connecting portion of the control passage 58 to the again desaxed arranged Auslassdrosselcons 78.
• a part of the connecting portion is formed by a radial bore 112 which, seen in the radial direction outside a short axial connecting bore to the recess 76, is sealed by means of a pressed into the bore 112 pin 114 from the environment.
• the bore 112 could also be arranged obliquely as in FIG. 1.
• the support body 48 with the fuel inlet channels 54 and the throttle bore 56 has an extension 116 engaging in the taper 110, which is conical in an end region 118 cooperating with the conical taper 110.
• the cone angle ⁇ of the conical end portion 118 is slightly larger than the corresponding cone angle of the taper 110.
• the insects 62 receiving and cylinder-like the piston-like end portion 36 of the injection valve member 34 leading guide sleeve 38 in turn has centering ribs 50, but no centering ring 50 'more.
• a cap-like annular disc 122 is placed on the first end face 46 of the guide sleeve 38, against which the this side end of the closing spring 40 abuts and from which engages an annular centering extension in the closing spring 40.
• the injection valve member 34 is by means of radially projecting guide ribs 124 in a region between the closing spring 40 and with the injection valve seat
• the otherwise circular cylindrical high-pressure chamber 22 is extended by a groove 126 extending in the axial direction, except at its end facing the housing body 14 extends approximately centrally of the closing spring 40 on the intermediate body 15. In this groove 126 opens a radial groove 128 which forms a portion of the Brennstoffzu Switzerlandkanals 30 and is connected to the parallel to the housing axis 12 through the housing body 14 extending portion of the Brennstoffzu Switzerlandkanals 30.
• the nozzle body 16 of small design is arranged sealingly on the housing body 14, indirectly via the intermediate body 15.
• the intermediate body 15 is about half its length along with the nozzle body 16 and the cap nut 19 in the injection valve passage 150 of the cylinder head 144 place. The sealing takes place in the same way as in the case of the fuel injection valve 4 shown in FIG.
• the nozzle body 16 is again short, but the housing body 14 is made longer.
• the intermediate body 15 according to FIGS. 1 and 2 is integrated in one piece into the housing body 14.
• the largest part of the high-pressure chamber 22 is located in the housing body 14, and the recess 108 with the end-side conical taper 110 engages deeper into the housing body 14.
• the cap nut 19 is formed with a correspondingly smaller diameter and threaded onto a stub of the housing body 14.
• the nozzle body 16 is here arranged sealingly directly on the housing body 14 and by means of the Ueberschsmutter 19 - a clamping nut 18 is not present - attached thereto.
• the support body 48 with its conical end portion 118 and the control channel 58 are formed the same as in the embodiment shown in FIG.
• the guide sleeve 38 On the support body 48 in turn is the guide sleeve 38 with its second end face 46 'sealingly. It has no centering ribs 50 (see Figures 1 and 2), but a centering ring 50 ', as shown in the' Figure 1, and thus also radial passages 52 for the fuel.
• the centering of the guide sleeve 38 in the support body 48 is carried out during assembly by guided in the guide sleeve 38 in close sliding fit long form of formation of the piston-like end portion 36 of the injection valve member 34 and the centering of the conical free end portion of the injection valve member 34 by cooperation with the injection valve seat 26 of the nozzle body sixteenth ,
• the Brennstoffzu semiconductorkanal 30 extends completely in the housing body 14, wherein it by a parallel to the housing axis 12, but with respect to this imaxêt blind hole-like bore and an opening into this, The latter is formed to be sealed at right angles to the housing axis 12, the latter being tightly sealed from the surroundings by a further pin 114 "pressed in.
• the recess 108 delimiting it has a groove-like circumferential broadening.
• the housing body 14 has, at a small axial distance to the cap nut 19, a shoulder-like, planar, annular sealing surface 140. This is when mounted on the cylinder head 144
• Sealing ring 142 for example made of copper, which in turn abuts against the cylinder head 144 formed on the annular counter-sealing surface 146.
• the housing body 14 is clamped in a well-known manner, for example by means of clamping screws, against the cylinder head 144, so that it seals the combustion chamber 8 bounded by this and the cylinder of the internal combustion engine 8 against the environment in cooperation with the sealing ring 142 and the cylinder head 144 ,
• the cap nut 19 for centering the nozzle body 16, the inner surface 19 ', which with a fit of typically 0.01- 0.05 mm with the outer surface 16' of the nozzle body 16 and a (the outer surface 15 'of the intermediate body 15 corresponding) outer surface 14' of the housing body 14 cooperates.
• Fuel injection valve, the housing body 14 and the nozzle body 16 are formed the same as in the embodiment shown in Figure 3.
• the extension 116 of the support body 48 is formed with a dome-shaped end portion 118 ', which cooperates sealingly with the conical taper 110 of the recess 108. In this embodiment too, a reliable seal is achieved by achieving a very narrow, almost circular sealing surface 120 in the axial direction.
• the guide sleeve 38 has no centering ribs 50 (see FIGS. 1 and 2), but a centering ring 50 'as known from FIGS. 1 and 3.
• a throttle bore 56 which connects the control channel 58 and thus the control chamber 70 with the high-pressure chamber 22.
• the sealing surface of the housing body 14 is designated.
• the closing spring 40 is located completely in the recess 108 of the housing body 14 and is fitted with the support body 48, the guide sleeve 38, the injection valve member 34 and the closing spring 40 from the side of the nozzle body 16.
• Nozzle body 16 is formed very similar to the embodiments shown in Figures 3 and 4. The deep in the
• Housing body 14 engaging recess 108 is in turn in its bottom end portion with a conical
• Rejuvenation 110 provided. In turn, this attacks the
• Support body 48 which is the same design, • as in the embodiments shown in Figures 2 and 3.
• the closing spring 40 is supported on the one hand at the free end of the injection valve member 34, which is cylindrical in one of the closing spring 40 facing end portion 130.
• a guide piston 132 which together with the cylindrical end portion 130 of the injection valve member 34 limits the control chamber 70.
• the integrally formed guide piston 132 extends through the closing spring 40, which is supported with its end remote from the injection valve member 34 on a support shoulder 46 '' of the guide piston 132.
• the guide piston 132 bears with its second end face 46 'under the action of the force of the closing spring 40 to the support body 48 sealingly.
• the guide piston 132 is held adjacent centered on the housing body 14, wherein a parallel to the housing axis 12 extending longitudinal groove 134 ensures the connection of the high-pressure chamber 22 with the fuel inlet channels 54 in the support body 48.
• a control passage 136 which extends in the support body 48 facing the end portion 60, for receiving an intermediate valve body 62, step-like.
• the intermediate valve body 62 has a stub engaging in the spring 68, corresponding to a stub protruding from the piston-like end region 36, in the embodiments shown in FIGS. 1-3.
• control passage 58 Through the intermediate valve body 62 and its stub through again the portion of the control passage 58 extends with the throttle constriction 66. Through this and the control passage 136 is the control chamber 70, at am Support body 48 adjacent intermediate valve body 62, connected via the throttle bore 56 to the high-pressure chamber 22.
• the embodiment of the fuel injection valve shown in FIG. 6 is extremely similar to that shown in FIG. The essential difference is that the actuator 84 is arranged coaxially with the housing axis 12.
• the pilot valve seat 88 is integrally formed on an outlet throttle extension 138 of the support body 48.
• the support body 48 engages with its conical end portion 118 in the conical taper 110 of the recess 108 in the housing body 14 and in turn is sealingly against this. From the conical end portion 118 extends the Auslassdrosselfortsatz 138, which is received with radial play in the corresponding, extending from the taper 110 to the bottom 74 of the Aktuatorareaaus Principleung 72 passage.
• the outlet throttle insert 78 shown in the embodiments according to FIGS.
• the outlet throttle restriction 82 is formed in the outlet throttle extension 138.
• the compressive forces caused by the high pressure in the recess 108 are completely absorbed by the seal between the conical end portion 118 of the support body 48 and the taper 110 in the housing body 14.
• the element 92 " which is embodied in FIGS. 1 to 5 as a sealing element 92, does not have to assume either a sealing function or a support function of the outlet throttle extension 138.
• These provisions are omitted in FIG. 6 and consequently they must be involved in the design and assembly of the components involved Even in the embodiment according to Fig. 6, the housing body 14 has the annular sealing surface 140 for the sealing of the combustion chamber (Figure 3). All embodiments shown in FIGS.
• the housing body 14 has a recess 108 with a conical taper 110 which is open in the direction of the nozzle body 16, and the support body 48 engages in this recess 108 and by means of the closing spring 40 on the taper 110 sealingly held in contact.
• the nozzle body 16 is particularly short, which allows a very compact design of the fuel injection valve 10. However, it must be considered that the injection valve member 34 and the nozzle body 16 on the housing axis 12 are well aligned, so that the injection valve seat 26 seals and the function when opening and closing the injector is flawless.
• the clamping nut 18 with an inner surface and the housing body 14 and intermediate body 15 with corresponding outer surfaces - analogous to the surfaces 14 ', 16', 19 '- are formed.
• FIGS. 1, 2, 3, 5 and 6 function as follows in a known manner. It is assumed that the state shown in the figures, in which the pilot valve 86 is closed, the injection valve member 34 abuts the injection valve seat 26 and the intermediate valve body 62, the fuel inlet passages 54 occlusive, abuts the support body 48. In the control chamber 70 and in the control channel 58, the same pressure prevails as in the high-pressure chamber 22.
• the actuator 84 is energized, whereby under the hydraulic force of the fuel, the pilot valve member 90 lifts from the pilot valve seat 88 and connects the control passage 58 through the outlet throttle restriction 82 to the low pressure outlet passage 104.
• the pressure in the control chamber 70 drops, whereby the injection valve member 34 is lifted from the injection valve seat 26.
• the intermediate valve body 62 remains on the support body 48 in abutment.
• the actuator 84 is de-energized, whereby the pilot valve 86 is closed.
• the pilot valve 86 is closed.
• Support body 48 passes. The fuel injector is ready for the next injection of fuel.
• the description of the function of the embodiment of the fuel injection valve 4 shown in FIG. 4 is based on the situation shown there.
• the pilot valve 86 is closed and the injection valve member 34 abuts the injection valve seat 26.
• the control chamber 70 and the control channel 58 pressure equalization prevails.
• the actuator 84 is energized, whereby under the hydraulic force of the fuel, the pilot valve member 90 is lifted from the pilot valve seat 88.
• the control channel 58 is connected to the low-pressure outlet channel 104 (see FIG. 1) through the outlet throttle restriction 82.
• the pressure in the control chamber 70 drops, which leads to the lifting of the injection valve member 34 from the injection valve seat 26.
• Fuel is injected under high pressure through the nozzle openings 28 into the combustion chamber.
• the actuator 84 is de-energized, whereby the pilot valve 86 is closed.
• the pilot valve 86 is closed.
• the conical end portions 118 of the support body 48 according to the end portion 118 'form dome-shaped and vice versa.
• the intermediate body 15 may be formed integrally on the nozzle body 16.
• This nozzle body 16 has a correspondingly greater axial length, so that it rests directly on the axial end face 20 of the housing body 14. He is then held by the clamping nut 18 on the housing body 14; the cap nut 19 is eliminated.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Manufacturing & Machinery (AREA)
• Fluid Mechanics (AREA)
• Fuel-Injection Apparatus (AREA)

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• 2006
  • 2006-04-04 US US11/911,515 patent/US7891584B2/en not_active Expired - Fee Related
  • 2006-04-04 BR BRPI0608785-0A patent/BRPI0608785A2/pt not_active IP Right Cessation
  • 2006-04-04 WO PCT/CH2006/000191 patent/WO2006108309A1/fr not_active Application Discontinuation
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  • 2006-04-04 DE DE502006005245T patent/DE502006005245D1/de active Active
  • 2006-04-04 AT AT06705426T patent/ATE447104T1/de active

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