EP2188516B1 - Dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant Download PDF

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Publication number
EP2188516B1
EP2188516B1 EP20080783475 EP08783475A EP2188516B1 EP 2188516 B1 EP2188516 B1 EP 2188516B1 EP 20080783475 EP20080783475 EP 20080783475 EP 08783475 A EP08783475 A EP 08783475A EP 2188516 B1 EP2188516 B1 EP 2188516B1
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EP
European Patent Office
Prior art keywords
housing
valve
pressure
fuel
filter
Prior art date
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Active
Application number
EP20080783475
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German (de)
English (en)
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EP2188516A1 (fr
Inventor
Marco Ganser
Ulrich Moser
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Ganser Hydromag AG
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Ganser Hydromag AG
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Publication of EP2188516A1 publication Critical patent/EP2188516A1/fr
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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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • 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
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

  • the present invention relates to a device for injecting high-pressure fuel into a combustion chamber in an internal combustion engine according to the preamble of patent claim 1.
  • the DE 10 2005 012 928 A1 discloses a fuel injector in which each injector is connected via a hydraulic line to a high pressure pump and / or to the injector of another cylinder of the internal combustion engine.
  • Another injector is out of the WO 2007/009279 A1 known.
  • this high-pressure accumulator injection system for an internal combustion engine each injection valve, a storage chamber and a check valve associated with parallel bypass throttle.
  • the injection valves are connected via fuel lines with a high-pressure conveyor. Thanks to the check valve associated with each injection valve with bypass throttle connected in parallel, this high-pressure accumulator injection system can be used to realize stable and reproducible injection processes with a favorable pressure curve in each injection process, even if the discrete storage chambers have an unusually small volume.
  • This high-pressure accumulator injection system does not require a bulky common rail.
  • Another injector is out of the EP 1 108 886 A known.
  • an injection valve is used for each combustion chamber.
  • For each injection valve runs through the cylinder head, a bore into which a pressure tube is inserted.
  • the housing of the injection valve has laterally on a high-pressure sealing surface on which rests the pressure tube with its integrally formed on this side end Hochtikarnadicht Chemistry.
  • the high-pressure return line to each pressure tube is formed by a single common rail, which is fastened by means of screws and claws directly to the cylinder head.
  • the claws form a structural unit with the common rail, which can be pressed by means of screws for sealing against the pressure tube.
  • a flow restrictor may be provided, which is fastened by means of a thread on the common rail and rests with its end remote from the common rail on the pressure tube.
  • the common rail forming the high-pressure feed line forms a common memory for the high-pressure fuel for all injectors. Common Rails are dependent on the number of cylinders of the internal combustion engine, the configuration of the internal combustion engine and their performance and thus specific for each engine type.
  • a number of fuel injectors are pressurized via high-pressure lines with high-pressure fuel via a high-pressure accumulator.
  • the fuel injectors comprise an annular space into which a connecting piece receiving the high-pressure line opens.
  • Associated with the high-pressure feed line is seen in the flow direction before the injector lying an additional volume added, which its distributor side facing a hydraulic decoupling element comprises.
  • the JP 2000-205081 A discloses a storage injection system in which fuel is supplied by means of a high-pressure pump under high pressure to a common rail.
  • An auxiliary storage is connected between a distributor pipe arranged downstream of the common rail and a nozzle holder.
  • the auxiliary storage has a capacity of 3 to 20 times the amount of fuel required for a full load injection.
  • the WO 03/076794 A1 discloses an injection system, which has delivery units for conveying fuel from a fuel reservoir for supplying at least one high-pressure line to the cylinders of an internal combustion engine. A number of fuel injectors are supplied via the at least one high-pressure line, wherein it comprises line sections with which the individual fuel injectors are connected to one another.
  • the injector bodies comprise an integrated storage space.
  • the memory When out of the EP 0 921 303 A known common rail injection system, the memory is connected directly via a claw and a pressure tube to the injector. In the event that larger leaks should occur in the injection system, a flow restrictor may be interposed between the accumulator and the claw.
  • the EP 1 353 063 A2 discloses a fuel injection system in which at least one injector connected to a feed system is provided for each cylinder of the internal combustion engine.
  • the feed system has an associated fuel pressure accumulator for each cylinder.
  • That in the DE 101 14 219 A1 disclosed fuel injection system for supplying the combustion chambers of an internal combustion engine with fuel has a high-pressure pump, which acts on a number of fuel injectors with high pressure fuel.
  • the individual fuel injectors each have a storage volume is assigned, which is acted upon directly by a high-pressure supply line from the high-pressure pump.
  • a feed connection and a clamp can be arranged on a housing of the injection valve itself or a pressure port.
  • a filter preferably retains solid particles in the fuel, which prevents clogging of, in particular, narrow flow cross sections and thus increases the reliability of the injection device. Since the filter also serves as a stop for limiting the opening movement of a valve member of a check valve, a particularly simple, space-saving design is possible.
  • Optimum injection processes without a common rail also make possible an injection device in which a pressure port assigned to an injection valve has a storage housing and a pressure pipe fastened thereto, for example via a screw connection.
  • the storage enclosure is connected to a high pressure supply line for the fuel and defines a discrete storage chamber for the fuel.
  • the discharge nozzle forms a stable, self-supporting, preassembled unit. If the discharge nozzle has a storage housing and a pressure pipe fastened thereto via a screw connection, it is possible in a particularly simple manner to form the pressure chamber.
  • the formation of the device with a screw connection allows the particularly simple installation of further components in the discharge nozzle, such as a check valve, a filter, in particular rod filter, and a flow-limiting valve.
  • each injection valve itself is provided with a further storage chamber.
  • Fig. 1 shows the first three and the last of a number of injection valves 10 of an internal combustion engine 12.
  • injectors 10 are well known and intended to intermittently inject under very high pressure fuel into combustion chambers 14 of the internal combustion engine 12.
  • the injection valves 10 are inserted into the cylinder head 16 of the internal combustion engine 12 and secured by means of clamping claws 18 and clamping screws 20 on the cylinder head 16.
  • Each of the identically trained and also in FIG. 2 Injectors 10 shown has an at least approximately cylindrical valve housing 22, the housing body is provided on its outer side with an outwardly directed high pressure sealing surface 24, which a fuel inlet opening of the valve housing 22 (see also Fig. 3 ) surrounds.
  • the high-pressure sealing surface 24 formed on the valve housing 22 tapers conically - seen in the radial direction with respect to the longitudinal axis 28 of the injection valve 10 - from the outside against the inside.
  • the generally known injection valves 10 have, on the one hand, nozzle openings for injecting the fuel and, on the other hand, connections for the electrically controlled actuator and optionally the fuel return.
  • the actuator controls a hydraulic control device for intermittently injecting the fuel.
  • Each injection valve is associated with a discharge nozzle 30 whose longitudinal axis 32 is preferably at least approximately, in this case exactly right angles to the longitudinal axis 28 of the injection valve 10 and this longitudinal axis 28 intersects.
  • the discharge nozzles 30 each have a pressure tube 34 and a storage housing 36, which by means of a Screw 38 are firmly connected.
  • the discharge ports 30 are, as in the Fig. 1 is indicated, inserted into the cylinder head 16 and by means of further clamping claws 18 'and other clamping screws 20' attached thereto and pressed in the direction against the injectors 10 such that the high-pressure sealing surfaces 24 and high-pressure counter-sealing surfaces 40 sealingly abut each other.
  • the further clamping claws 18 'and clamping screws 20' form clamping devices 41 for the discharge nozzle 30.
  • the valve housing 22 and storage housing 36 are in the region of the attack of the clamping claws 18 and 18 'formed the same, so that for fixing the injectors 10 and for fixing the discharge nozzle 30 identical trained clamps 18, 18 'and clamping screws 20, 20' can be used.
  • the storage housings 36 have, at their free end facing away from the pressure tube 34, a feed connection 42 arranged concentrically to the longitudinal axis 28.
  • a high pressure feed line 44 To the supply port 42 of the first injection valve 10th leads a high pressure feed line 44, which in the Fig. 2 is shown.
  • This is the other hand connected to a not shown, well-known high-pressure pump, which supplies the injectors 10 under very high pressure, for example, about 1600 to more than 2000 bar standing fuel.
  • each storage housing 36 is encompassed by a clamp 48.
  • each storage housing 36 has a radial connection passage 50 - see Fig. 3 to 5 -
  • the connecting passage 50 of the last of the series of injection valves 10 associated pressure port 30 is sealed by means inserted into the clip 48 locking pin 52.
  • all storage enclosures 36 and clamps 48 can be made the same. If the internal combustion engine 12 is an in-line engine, then the respective further high-pressure feed lines 44 'may optionally be of identical design.
  • Fig. 3 shows particularly clearly, extends through the substantially circular cylindrical storage housing 36 through a bore 54, which extends several times from the supply port 42 to the pressure tube side end.
  • the bore 54 In an end region facing the pressure tube 34, the bore 54 has its largest diameter and is provided there with an internal thread 56.
  • pressure tube 34 In the internal thread 56 which is provided in the present end region with an external thread 58 pressure tube 34 is screwed.
  • the screw 38 formed by the internal thread 56 and external thread 58 has on the one hand the pressure tube 34 a hexagon socket 60 for the attack of a fork wrench and on the other hand, the storage housing 36 two parallel chamfers 62, which serve the attack of another fork wrench or clamping in a jig (see Fig. 1 and 2 ).
  • a filter section 70 Adjoining the storage chamber 68 is a filter section 70, in which the bore is cylindrical with a smaller diameter than in the cylindrical region of the storage chamber 68. Between the cylindrical region of the storage chamber 68 and the filter section 70, the bore 54 has a relatively short conical section in the axial direction.
  • a filter 72 and a check valve with throttle passage 74 is arranged, which in conjunction with Fig. 5 to be described in more detail.
  • the bore 54 is cylindrical and, as in Fig. 5 shown with a relation to the filter section 70 again smaller diameter. This at least approximately coincides with the inner diameter of the high pressure supply lines 44, 44 'match.
  • the bore 54 is conically widening designed to form a connection sealing surface 76 for the high-pressure supply line 44 or further high-pressure supply line 44 '.
  • the end of the high pressure supply line 44 and the further high pressure line 44 ' is held in a known manner by means of a union nut 78 on a nozzle-like projection of the storage housing 36.
  • connection passage 50 branches off from the bore 54, between the filter section 70 and the supply port 42, in the radial direction, the connection passage 50 from.
  • the connecting passage 50 expands in its radially outer half conically around a sealing surface 80 of a Weg effetsan gleiches 82 to form.
  • This further has the clamp 48, which surrounds the storage housing 36 and is provided with a threaded neck 84 formed in the radial direction with internal thread 86. With the internal thread 86, a pressure screw 88 cooperates, which is penetrated by the further high-pressure feed line 44 'and the sealing end portion 90 of the further high-pressure feed line 44' presses sealingly against the sealing surface 80.
  • the volume of the discrete storage chamber 68 preferably corresponds to four to twenty times the volume of the fuel for engine full load injection. It should also be mentioned at this point that the volume of the storage chamber 68 is greater than, preferably two to three times as large as the storage volume for fuel in the pressure pipe 34.
  • the construction of the substantially cylindrical storage housing 36 with the bore 54, which in the one direction widened or narrowed in the other direction, and the formation of the Weg effetsan gleiches 82 with an attachable to the storage housing 36 clamp 48 is extremely simple, allows the formation of the storage chamber 68, the fixed connection with the pressure tube 34 and the installation of other components, in conjunction with the Fig. 5 and 6 to be discribed.
  • filter 72 is a rod filter 72 '.
  • This is cylindrical in shape and has distributed along its circumference longitudinal grooves 92, 92 ', which alternately open to the storage chamber 68 and the supply port 42 towards the other, however, are closed, and each other, measured in the axial direction, over a substantial part of the length of the rod filter 72 'overlap.
  • the outer diameter of the rod filter 72 ' is slightly smaller than in the two axial end portions 94 and 94', which the longitudinal grooves 92 and 92 'close and with which the rod filter 72' in the filter section 72 of the bore 54 in the manner of Press fit is held.
  • the check valve 74 is arranged with throttle passage.
  • a ring-like, flat valve seat 98 of the check valve 74 is on Storage housing 36 formed by a shoulder 98 'of the bore 54 at the feed port side end of the filter section 70.
  • a valve member 100 is a valve member plate 100 ', on which the throttle passage 102 is formed centrally.
  • the valve member plate 100 'facing the end of the rod filter 72' forms a stop 106 for the valve member plate 100 'in order to limit its opening movement.
  • the seat 112 of this flow restricting valve 110 is formed by a conical configuration of the longitudinal bore 108 at the transition from the cylindrical portion of small diameter in the cylindrical end portion 108 'with a larger diameter.
  • punch 114 With the seat 112 acting as a valve member punch 114 cooperates, which is biased by a further coil spring 116 in the direction of the open position of the flow control valve 110.
  • the punch 114 In the Fig. 6 the punch 114 is shown in the open position. In the closed position, it engages in the seat 112 and prevents the further inflow of fuel to the associated injection valve 10.
  • a sleeve-shaped piston member 118 On the side facing away from the seat 112 of the stamp 114, due to the force of the other coil spring 116, on a sleeve-shaped piston member 118 into which a shutter member 120 is inserted.
  • the piston element 118 is arranged with a relatively narrow sliding fit 122 of for example 1/100 mm to 3/100 mm in the pressure tube 34 and slidably mounted in the direction of the longitudinal axis 32.
  • the diaphragm element 120 is pressed sealingly in the piston element 118 and has a diaphragm passage 120 'in the axial direction.
  • At the piston element 118 and the diaphragm element 120 facing the end of the punch 114 has this crosswise extending radial grooves 124, which allow the passage of fuel from the storage bracket 68 and the aperture passage 120 'to the associated injection valve 10.
  • the piston element 118 has, on its end face facing the punch 114, a depression 126, with respect to which the diaphragm element 120 is set back and which serves to center the punch 114 engaged therein. On the side facing away from the punch 114, the piston element 118 has a further depression 126 'in order to form a peripheral stop bead 128 radially outward. This cooperates with a stop disk 130, which on the other hand is supported via a spring washer 132 on a support shoulder 134 of the storage housing 36 at this. On the other hand, the pressure tube 34 abuts against the stop disk 130 with its side on this side and presses it against the spring ring disk 132.
  • the pressure pipe 34 has, on its radial outer side, a sealing shoulder 136 against which a sealing ring 138 rests.
  • this sealing ring 138 bears against a counter-sealing shoulder 140 of the storage housing 36.
  • the cross-section of the orifice passage 120 ' is substantially smaller than any other in the inflow to the injection valve 10 acting passages of the flow path for the fuel in the discharge nozzle 30. This means that during normal injection operations, the piston member 118 together with the punch 114 toward the seat 112th However, even with full-load injections, the punch 114 does not come into contact with the seat 112. After completion of an injection process, the punch 114 moves together with the piston member 118, supported by the force of the other coil spring 116, again in the direction of the stop plate 130th
  • the installation of the flow control valve 110, the filter 72 and the check valve 74 with throttle passage in the discharge nozzle 30 allows a simpler and space-saving design of otherwise optionally equipped with these elements injectors 10.
  • the discharge nozzle 30 may be formed with only one or none of these elements , In any case, however, it has a storage chamber 68.
  • the two-part construction of the housing of the pressure port 30, namely by a pressure tube 34 and a storage housing 36, allows a simple and inexpensive production of the pressure port 30 with integrated storage chamber 68 and optionally other elements - as stated above -.
  • a part of the storage chamber 68 can also be formed on the pressure pipe 34.
  • connection sealing surface 76 and the thread for the nut 78 are integrally formed on a substantially circular cylindrical connecting part 142, on the other hand inserted into the correspondingly extended in this area running bore 54 of the storage enclosure 36 and by means of a screw 144 at this is attached.
  • the connection part 142 can have engagement surfaces, for example a hexagon, between the threads for the union nut 78 and the screw connection 144 for a tool for tightening or loosening the further screw connection 144.
  • connection part 142 A portion of the communication passage 50 is formed on the connection part 142, and another portion on the storage case 36. To ensure the connection between these sections, the connecting part 142 has a circumferential groove 146.
  • sealing shoulders 148 are integrally formed on the connecting part 142 and the storage housing, which bear sealingly against each other.
  • the filter 72 facing end face of the connecting part 142 forms the valve seat 98 for the valve member 100 and the valve member plate 100 '. Between this end face and the circumferential groove 146 there is either a sealing element or a relatively close fit between the connecting part 142 and the storage housing 36 in order to prevent leakage or keep it as small as possible.
  • This variant shown has the advantage that the filter 72 or the bar filter 72 'can be introduced into the filter section 70 from the here end of the storage housing 96.
  • the storage housing 36 at the transition of the bore 54 from the filter section 70 into the storage chamber 68 have a stop bead 150.
  • the filter section 70 may have a diameter which corresponds to the diameter of the bore of the storage chamber 68 and the bore is closed with a suitably adapted in a simple manner connector 142.
  • filter 72 check valve 74, flow control valve 110, and connection section with supply port 42 and clamp 48, individually and in combination, also suitable for use directly in injectors 10.
  • the illustrated and described embodiment of filter 72, check valve 74, flow control valve 110, and connection section with supply port 42 and clamp 48 also suitable for use directly in injectors 10. In this case, occurs in place of the storage housing 36 and optionally the pressure tube 34, the valve housing 22nd
  • Fig. 7 shows a portion of an injector 10 in which the discrete storage chamber 68 is arranged in a known manner in the valve housing 22 of the injection valve 10.
  • the housing body 152 of the valve housing 22 does not have a high pressure sealing surface 24 for the pressure tube 34 of a Pressure port 30, but the high-pressure feed line 44 is connected to the supply port 42, which is integrally formed on a connecting piece 150 of the valve housing 22.
  • This is eingindet in the housing body 152 and with respect to the terminal sealing surface 76 and the supply port 42 is formed the same as that described above and in Fig. 5 shown connection part 142.
  • the filter portion 70 opens into the molded on the housing body 152 storage chamber 68, wherein in the filter section 70, from the storage chamber 68 side facing, the filter 72 is inserted in the form of a rod filter 72 '.
  • the longitudinal grooves 92 'open toward the check valve 74 and the supply port 42 are sealed off from the storage chamber 68 by the axial end region 94'.
  • the rod filter 72 'in the storage chamber 68 facing the axial end portion 94' in a direction radially outwardly open circumferential groove 154 which via crosswise extending radial bores 156 and a sack-like, to Storage chamber 68 toward open axial bore 158 is fluidly connected to the storage chamber 68.
  • the longitudinal grooves 92 open into the circumferential groove 154 and end there, the longitudinal grooves 92 'are separated therefrom.
  • the circumferential groove 154 is radially outwardly covered by the connecting piece 150.
  • the end region of the rod filter 72 'protruding in the direction of the storage chamber 68 via the connecting piece 150, forming a flange 160, has a larger diameter than the part of the rod filter 72' arranged in the filter section 70.
  • the flange 160 rests with its surface facing the connection piece 150 against a front-side counter-shoulder 162 of the connecting piece 150 and is encompassed by a sealing bead 164 of the connecting piece 150 projecting in the axial direction with respect thereto.
  • a peripheral shoulder 166 forming the outer diameter is integrally formed on the transparent cross section of the storage chamber 68 on the flange 160.
  • the shoulder 166 and the free end of the sealing bead 164 abut against a sealing ring 168, which on the other hand bears against a sealing shoulder 170 of the housing body 152 and is supported radially outward by the housing body 152 and radially inward by the flange 160. With the free end portion of the flange 160 engages this in the storage chamber 68 forming portion of the axial bore in the housing body 152 a.
  • the preferably rectangular cross-section sealing ring 168 may be made of a soft metal and is compressed when tightening the screw 172 between the connecting piece 150 and the housing body 152, in order to very high pressures to ensure a reliable seal.
  • valve seat 98 for the valve member plate 100 'designed as a valve member 100 of the check valve 74 is integrally formed on the connecting piece 150.
  • the connecting piece 150 has a circumferential, axial undercut 174 so that a ring-like, axially exposed bead is formed with the annular valve seat 98.
  • the valve member plate 100 'with the centrally arranged throttle passage 102 is held by the coil spring 104technischdrteilbar on the valve seat 98 in abutment, wherein the coil spring 104 the other end on the rod filter 72' is supported. It engages in a world-side centering recess 176 of the rod filter 72 ', which has a relative to the axial end portion 94 in the direction of the valve member plate 100' projecting, sleeve-shaped projection whose free end forms the stop 106 to limit the opening travel of the valve member plate 100 '.
  • the clamping claw 18 engages with its pressure shoulder 64 on the connecting piece 150 side end face of the housing body 152, which forms the counter-shoulder 66.
  • the injection valve 10 can otherwise be configured as in the WO 2007/009279 A disclosed. Further, it is also possible the connection piece 150 for feeding a further injection valve 10 according Fig. 4 train. Moreover, it should be mentioned that the discharge nozzle 30 analog Fig. 7 can be trained. When in the Fig. 7 In the embodiment shown, the rod filter 72 'is held between the connecting piece 150 and the sealing ring 168. However, it is also possible, as described above, to fix the rod filter 72 'by means of a press fit in the connecting piece 150.
  • the discrete storage chamber 68 is also formed on the housing body 152 of the injection valve 10.
  • the extending in the direction of the longitudinal axis 28, the storage chamber 68 forming bore 54 is sealed at the connection-side end of the housing body 152 by means of a threaded in this sealing plug 178 of the valve housing 22.
  • the end face of the sealing plug 78 facing the storage chamber 68 forms the valve seat 98 for the valve member 100 'of the check valve 74.
  • the throttle passage 102 extends centrally through the valve member plate 100'.
  • the valve member plate 100 'facing end face of the rod filter 72' forms the stop 106 to limit the opening movement of the valve member plate 100 '.
  • the bar filter 72 ' On the side facing away from the check valve 74, the bar filter 72 'is supported on a circumferential support shoulder 182 in the axial direction.
  • the rod filter 72 ' according to Fig. 8 , is in principle the same education as that according to the Fig. 3 and 5 However, he is in the direction of Seen longitudinal axis 28 may be formed shorter, because it has approximately the same diameter as the storage chamber 68. Thus, it can have more longitudinal grooves 92, 92 'as the embodiment according to the Fig. 3 and 5 to form the same flow area in the narrow filter gaps between the rod filter 72 'and the housing body 152.
  • the rod filter 72 ' is preferably held in the housing body 152 by means of a press fit.
  • the sealing plug 178 is provided with a fuel channel 184 which is connected on the one hand to the high-pressure feed line 44 and on the other hand to the further high-pressure feed line 44 'and leads to the check valve 74. It is formed by a blind hole embraced by the annular valve seat 98, a radial bore 190 intersecting with it, and a circumferential connecting groove 192 which is open in the radial direction with respect to the longitudinal axis 28 and opens into the bottom region of the radial bore 190.
  • the sealing plug 178 between the connecting groove 192 and its front side facing the storage chamber 68 is held in a relatively tight fit in the housing body 152 in order to prevent or at least minimize leakage from the fuel from the connecting groove 192 to the rod filter 72 ' , Toward the free end of the housing body 152, a seal 194 prevents the escape of fuel to the environment.
  • the compound groove 192 extends through the housing body 152 through the connecting passage 50, which on both sides, in the radial direction outwardly, flared to form the sealing surfaces 80, to which the corresponding sealing surfaces 80 of High-pressure supply line 44 and further high-pressure supply line 44 'come to the plant.
  • the storage chamber 68 is integrally formed on the housing body 152 of the valve housing 22, from which, in the direction towards the nozzle openings facing away from the end, a connecting hole 196 parallel to the longitudinal axis 28 and with respect to this laterally offset in the housing body 152.
  • Denoted at 198 is the further communication bore leading from the storage chamber 68 to the nozzle openings.
  • the connecting hole 196 is either executed like a blind hole or closed by a plug.
  • the bore 54 is designed to taper in a stepwise manner, wherein it widens conically from its narrowest part, which forms an inflow section 200, in the direction towards the outside, in order to form a high pressure sealing surface 24.
  • a pressure pipe socket 202 with its Hochschermendicht Structure 40 sealingly is provided at this.
  • the pressure pipe stub 202 is generally known construction and has no discrete storage chamber 68 in the present case. In principle, however, it can be provided with such a storage chamber and constructed as described above.
  • the bore 54 is tightly closed by means of a sealing plug 178 threaded into the housing body 152.
  • a sealing ring 168 acts between the sealing plug 178 and the housing body 152.
  • the sealing plug 178 projecting and integrally formed with this plug shaft 204 of the rod filter 72 ' is formed, which is otherwise exactly the same as described above and, for example in the Fig. 3 and 5 shown.
  • the longitudinal grooves 92 in the direction of the check valve 74 and thus to the fuel-supplying pressure pipe stub 202 open and on the other hand closed by the axial end portion 94, which seen in the inflow direction of the fuel, sealingly against the housing body 152 upstream of the flow connection to the connecting hole 196. Accordingly, the through the axial end portion 94 extending through longitudinal grooves 92 ' upstream through the axial end portion 94 'closed.
  • the plug stem 204 is provided with a reduced cross section to produce an adequate flow area to the communication bore 196.
  • the inflow section 200 facing the end face of the rod filter 72 ' forms the stop 106 for the valve member plate 100' formed valve member 100 of the check valve 74. It has on its side facing the rod filter 72 on the centering 180, which is encompassed by this side end of the coil spring 104 the latter engaging in the centering recess 176 of the rod filter 72 'and resting against the bottom thereof.
  • the coil spring 104 By the coil spring 104, the valve member plate 100 'is held back against the valve seat 98 in abutment, which is formed by a step-like constriction of the bore 54.
  • the injection valve 10 corresponding to the WO 2007/009279 A be educated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (10)

  1. Dispositif d'injection de carburant sous haute pression placé dans une chambre de combustion (14) d'un moteur à combustion (12), avec une soupape d'injection (10), un compartiment d'accumulation (68) de carburant séparé disposé dans un boîtier (36) et associé à la soupape d'injection (10) et relié à une conduite d'amenée sous haute pression (44) via un raccord de conduite d'amenée (42) du boîtier (36), une autre conduite d'amenée sous haute pression (44'), servant à alimenter une autre soupape d'injection (10), étant raccordée au boîtier et le boîtier (36) comportant un passage de liaison (50) conduisant à l'autre conduite d'amenée sous haute pression (44'), caractérisé en ce que le boîtier (36) comporte au niveau de son extrémité libre le raccord de conduite d'amenée (42) disposé de façon concentrique par rapport à l'axe longitudinal (28) du boîtier (36) et agrippé sur sa périphérie par un collier de serrage (48) à l'aide duquel l'autre conduite d'amenée sous haute pression (44') est raccordée au boîtier (36).
  2. Dispositif selon la revendication 1, caractérisé en ce qu'une soupape de limitation de flux (110) est disposée dans le boîtier (36) pour le carburant.
  3. Dispositif selon la revendication 2, caractérisé en ce que la soupape de limitation de flux (110) comporte un piston plongeur (114) défini de façon à interagir avec un siège (112) et un élément de piston (118) contre lequel le piston plongeur (114) repose sous ressort avec son côté opposé au siège (112).
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé par une soupape de retenue (74) disposée dans le boîtier (36) et agissant entre le compartiment d'accumulation (68) et la conduite d'amenée sous haute pression (44) de carburant, ladite soupape comportant un élément de soupape (100) interagissant avec un siège de soupape (98) et doté d'un passage d'étranglement (102) pour le carburant ainsi qu'un filtre (72) de carburant disposé dans le boîtier (36), le filtre (72) formant une butée (106) de limitation du mouvement d'ouverture de l'élément de soupape (100).
  5. Dispositif selon la revendication 4, caractérisé en ce que le filtre (72) comporte un filtre tige (72') qui forme la butée (106).
  6. Dispositif selon la revendication 4 ou 5, caractérisé en ce que l'élément de soupape (100) prend la forme d'une plaquette d'élément de soupape (100') pourvue du passage d'étranglement (102).
  7. Dispositif selon l'une quelconque des revendications 4 à 6, caractérisé en ce que le siège de soupape (98) est moulé au niveau du boîtier (36).
  8. Dispositif selon l'une quelconque des revendications 4 à 7, caractérisé en ce que la soupape d'injection (10) comprend un boîtier de soupape (22) doté d'une surface étanche aux hautes pressions (24) orientée contre l'extérieur et entourant une ouverture d'admission de carburant (26) du boîtier de soupape (22), une tubulure de pression (30) pour amener le carburant à l'ouverture d'admission de carburant (26), un boîtier d'accumulation (36) délimitant le compartiment d'accumulation (68) de carburant et comprenant le raccord de conduite d'amenée (42), ledit boîtier étant relié d'une part à la conduite d'amenée sous haute pression (44, 44') par le biais du raccord de conduite d'amenée (42) et comportant d'autre part un tube de pression (34) qui repose, avec une contre-surface étanche aux hautes pressions (40) réalisée dans une zone d'extrémité libre, contre la surface étanche aux hautes pressions (24) et un dispositif de serrage (41) s'agrippant au niveau de la tubulure de pression (30) pour comprimer de façon étanche la contre-surface étanche aux hautes pressions (40) contre la surface étanche aux hautes pressions (24).
  9. Dispositif selon l'une quelconque des revendications 4 à 7, caractérisé en ce que la soupape d'injection (10) comporte un boîtier de soupape d'injection (22) comprenant le raccord de conduite d'amenée (42), dans lequel sont disposés le compartiment d'accumulation (68), la soupape de retenue (74) et le filtre (72) et auquel s'agrippe sur sa périphérie le collier de serrage (48).
  10. Dispositif selon la revendication 9, caractérisé en ce que le boîtier de soupape d'injection (22) comprend un corps de boîtier (152) délimitant le compartiment d'accumulation (68) et une tubulure de raccordement (150) disposée au niveau de celui-ci et raccordée à la conduite d'amenée sous haute pression (44), dans laquelle la soupape de retenue (74) et le filtre (72) sont disposés et au niveau de laquelle le siège de soupape (98) est de préférence moulé.
EP20080783475 2007-09-13 2008-09-05 Dispositif d'injection de carburant Active EP2188516B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH14282007 2007-09-13
PCT/CH2008/000375 WO2009033304A1 (fr) 2007-09-13 2008-09-05 Dispositif d'injection de carburant

Publications (2)

Publication Number Publication Date
EP2188516A1 EP2188516A1 (fr) 2010-05-26
EP2188516B1 true EP2188516B1 (fr) 2011-10-26

Family

ID=39032168

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080783475 Active EP2188516B1 (fr) 2007-09-13 2008-09-05 Dispositif d'injection de carburant

Country Status (5)

Country Link
US (1) US8336524B2 (fr)
EP (1) EP2188516B1 (fr)
AT (1) ATE530761T1 (fr)
BR (1) BRPI0816923A2 (fr)
WO (1) WO2009033304A1 (fr)

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WO2014131497A1 (fr) * 2013-03-01 2014-09-04 Ganser-Hydromag Ag Dispositif permettant d'injecter un carburant dans la chambre de combustion d'un moteur à combustion interne
US9803603B2 (en) 2013-03-01 2017-10-31 Ganser-Hydromag Ag Device for injecting fuel into the combustion chamber of an internal combustion engine

Also Published As

Publication number Publication date
EP2188516A1 (fr) 2010-05-26
WO2009033304A8 (fr) 2010-03-18
US8336524B2 (en) 2012-12-25
BRPI0816923A2 (pt) 2015-03-17
US20100170476A1 (en) 2010-07-08
WO2009033304A1 (fr) 2009-03-19
ATE530761T1 (de) 2011-11-15

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