EP2812559B1 - Injecteur de carburant et dispositif d'injection de carburant - Google Patents

Injecteur de carburant et dispositif d'injection de carburant Download PDF

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Publication number
EP2812559B1
EP2812559B1 EP13702576.3A EP13702576A EP2812559B1 EP 2812559 B1 EP2812559 B1 EP 2812559B1 EP 13702576 A EP13702576 A EP 13702576A EP 2812559 B1 EP2812559 B1 EP 2812559B1
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EP
European Patent Office
Prior art keywords
pressure
fuel
port
valve
chamber
Prior art date
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Active
Application number
EP13702576.3A
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German (de)
English (en)
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EP2812559A1 (fr
Inventor
Marco Ganser
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Ganser Hydromag AG
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Ganser Hydromag AG
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Publication of EP2812559A1 publication Critical patent/EP2812559A1/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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • F02M55/001—Pumps with means for preventing erosion on fuel discharge
    • 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
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • 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
    • 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
    • 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
    • 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
    • F02M67/00—Apparatus in which fuel-injection is effected by means of high-pressure gas, the gas carrying the fuel into working cylinders of the engine, e.g. air-injection type
    • F02M67/10—Injectors peculiar thereto, e.g. valve less type
    • F02M67/12—Injectors peculiar thereto, e.g. valve less type having valves
    • 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
    • F02M55/008—Arrangement of fuel passages inside of injectors

Definitions

  • the present invention relates to an injection valve for the intermittent injection of fuel into the combustion chamber of an internal combustion engine according to claim 1 and to an apparatus for the intermittent injection of fuel into a number of combustion chambers of an internal combustion engine according to claim 13.
  • a fuel injector is from the document WO 2009/033304 A1 known. It has a longitudinal axis defining and a high-pressure chamber limiting valve housing, which carries at one end connected to the high-pressure chamber nozzle body.
  • a housing body forming the valve body is designed to be head-like thickened in its end region remote from the nozzle body and has two high-pressure connections diametrically opposite each other with respect to the longitudinal axis ( Fig. 8 ).
  • a bore extending in the direction of the longitudinal axis is closed by means of a sealing plug, which has a circumferential connecting groove, a radial bore opening into the bottom region thereof and a blind bore lying on the longitudinal axis.
  • the two high-pressure connections are connected to one another via the connecting groove, and the high-pressure connections are connected to the high-pressure chamber via the radial bore and the blind bore.
  • Such a configuration of the fuel injector allows a number of such fuel injectors to be interconnected by means of fuel high pressure communication lines connect and connect a first of the series of fuel injection valves via a high-pressure fuel feed line with a high-pressure feed pump.
  • Such a device for the intermittent injection of fuel into combustion chambers of an internal combustion engine has the advantage that it is possible to dispense with bulky and expensive so-called common rails and still, with space-saving design, a reliable working of the injectors can be guaranteed. How this is made possible in a particularly simple way, goes out of the documents WO 2007/009279 A1 and WO 2009/033304 A1 out.
  • the document WO 2011/085058 A1 discloses a fuel injector having a high pressure input, a first fuel injector, and at least one further fuel injector.
  • the high-pressure input fuel at least indirectly feasible in a fuel chamber of the first fuel injection valve
  • the further fuel injection valve is connected via a line to the first fuel injection valve and wherein via the lines fuel from the fuel chamber of the first fuel injection valve in a fuel chamber of the other fuel injection valve can be guided.
  • the fuel chambers of the fuel injectors receive a total fuel volume that includes a partial volume for fuel injection and at least one additional fractional volume to facilitate damping.
  • throttles are installed in the lines or high-pressure connections of the fuel injection valves.
  • the document WO 03/076794 A1 discloses an injection system for fuel for use on internal combustion engines. It comprises a delivery unit for conveying fuel from a fuel reservoir for supplying at least one high pressure line to the cylinders of the internal combustion engine. A number of fuel injectors are supplied via the at least one high-pressure line, each of which contains an injector nozzle supplying fuel to a combustion chamber of the internal combustion engine.
  • the at least one high-pressure line comprises line sections with which the individual fuel injectors are connected to one another.
  • the injector bodies of the fuel injectors hold an integrated storage space.
  • the inventive fuel injection valve for the intermittent injection of fuel into the combustion chamber of an internal combustion engine has a preferably elongated and preferably at least approximately cylindrical valve housing, which defines a longitudinal axis, and in which a discrete storage chamber having a high-pressure chamber is arranged.
  • This high-pressure chamber extends into the interior of a nozzle body, which is arranged at a longitudinal end of the valve housing and supported by this.
  • this has a connection part with two high-pressure connections. These each define their connection axis and are unthrottled with each other and fluidly connected to the high-pressure chamber.
  • the two high-pressure ports are arranged in a common connection surface of the connecting part, wherein they are the same direction and their connection axes parallel to each other.
  • high-pressure fuel lines can be connected to the two high-pressure ports from the same side.
  • a connecting line is present, which is formed in the valve housing and connects the high-pressure connections with each other and with the high-pressure chamber.
  • a first section of the connecting line leads from the first high-pressure connection to the high-pressure chamber.
  • a second section of the connecting line branches off from the first section and connects it to the second high-pressure connection.
  • connection surface is a connection plane. This allows a particularly simple design.
  • this connection plane extends at right angles to the longitudinal axis of the fuel injection valve.
  • the high-pressure connections are thereby - in the installed state - on a side facing away from the cylinder head of the internal combustion engine and thus freely accessible side of the fuel injector.
  • the connection plane forms an end face of the valve housing.
  • connection axes of the two high-pressure connections and the longitudinal axis of the valve housing are parallel to one another.
  • the longitudinal axis and the connection axis lie in a common plane, with the longitudinal axis and one of the connection axes particularly preferably being aligned with one another.
  • a particularly simple embodiment of both the fuel injection valve and the high-pressure fuel lines results when the high-pressure ports are identical.
  • the high-pressure connections usually have, concentric with the connection axis, a high-pressure sealing surface, which preferably conically tapers toward the interior of the housing, for the high-pressure fuel lines.
  • the high-pressure connections in the radial direction outside the high-pressure sealing surfaces, have leakage monitoring openings which are flow-connected to one another in the connection part.
  • the high-pressure fuel lines are double-walled, wherein the inner tube of the guide of the high-pressure fuel and the jacket space between the inner tube and the outer tube of the leakage monitoring is used. The jacket space is then, in the installed state, fluidly connected to the leakage monitoring openings and the inner tube is then sealingly against its sealing surface on the high-pressure sealing surface.
  • the nozzle body has an injection valve seat, which is flow-connected to the high pressure space. Through the nozzle body passing nozzle openings are in a known manner in the region of the injection valve seat or centric of these in a nozzle tip.
  • the injection valve seat acts in particular a needle-shaped injection valve member, which is arranged adjustable in the valve housing in the direction of the longitudinal axis.
  • a compression spring is supported on the injection valve member and acts on this with a directed in the direction of the injection valve seat closing force.
  • the compression spring is supported on a guide sleeve and presses it against an intermediate plate sealingly.
  • the guide sleeve together with a guided in the guide sleeve, formed on the injection valve member control piston defines a control chamber against the high-pressure chamber.
  • a Control device for controlling the axial movement of the injection valve member by changing the pressure in the control chamber has an intermediate valve, the intermediate valve member releases in open position connected to the high-pressure chamber high-pressure passage into the control chamber and in the closed position separates the control chamber from the high pressure passage. Further separates, preferably mushroom-shaped intermediate valve member continuously from the control chamber of a valve chamber, wherein the control chamber and the valve chamber are permanently interconnected solely via a throttle passage.
  • a pilot valve is actuated, which connects the valve chamber with a low-pressure fuel return or separates from this.
  • the control device is designed in a preferred manner, as in the document WO 2007/098621 A1 is disclosed.
  • the actuator assembly is preferably formed, as is apparent from the document WO 2008/046238 A2 is known.
  • the high-pressure chamber includes a discrete storage chamber. This makes it possible to keep the pressure drop in the injection processes within limits.
  • a throttle device which controls the flow of fuel from the high pressure ports into the storage chamber at least Allows almost unhindered and throttles in the opposite direction. This allows high pressure fuel to flow to each fuel injector during its injection event both from the discrete storage chamber of other fuel injectors and from a high pressure (high pressure) pump.
  • WO 2007/009279 A1 the document WO 2007/009279 A1 from which the structure and operation as well as the dimensioning of such fuel injectors and discrete storage chambers (and their interaction with the high-pressure fuel lines) is known. The disclosure in question is incorporated by reference in the present specification.
  • the throttle device is preferably designed as a check valve, the check valve member is provided with a throttle bore.
  • connection part has a connection body or is formed by it.
  • the high-pressure connections and the connecting line are formed on the connection body, wherein the connecting line connects the high-pressure connections unthrottled with one another and with the discrete storage chamber, which is formed in a storage body of the valve housing adjacent to the connection body.
  • a low-pressure fuel return connection-which is connected to the low-pressure fuel return-and an electrical connection which is connected to the actuator arrangement via an electrical connection line are preferably arranged on the connection body.
  • Preference is further on Storage body an intermediate body, in which the actuator assembly is arranged.
  • a valve body of the valve housing preferably bears against the intermediate body, which carries the nozzle body on the side facing away from the intermediate body.
  • the injection valve member and the control device is arranged.
  • These bodies are preferably in succession in the direction of the longitudinal axis to each other and are preferably secured to each other by means of union nuts.
  • said bodies have an at least approximately circular cylindrical outer contour, which may decrease in diameter (from the intermediate body to the nozzle body).
  • the valve housing in particular the connecting body, at least one mounting flange, which protrudes in the radial direction to the outside.
  • two diametrically opposite mounting flanges are provided.
  • the mounting flange, or the mounting flanges provided with a through hole.
  • the through hole is penetrated by a clamping screw, which is then supported with its head on the respective mounting flange and on the other hand is threaded into the cylinder head.
  • the mounting flange or are the mounting flanges, in the direction of the longitudinal axis, between the connecting part and the nozzle body, in particular on a running in the direction of the longitudinal axis legs of the connecting body.
  • the device according to the invention for the intermittent injection of fuel into a number of combustion chambers of an internal combustion engine has a fuel injection valve according to the invention per combustion chamber.
  • the fuel injection valves are of identical construction.
  • a first high-pressure fuel line - a high-pressure fuel feed line - connected, which is connected to feed the fuel injection valves with high-pressure fuel on the other hand with a high-pressure feed pump.
  • a second high-pressure fuel line Connected to a second of the two high-pressure ports of this first fuel injection valve is a second high-pressure fuel line which, on the other hand, is connected to the first high-pressure port of the two high-pressure ports of the next following fuel injection valve.
  • This second high-pressure fuel line forms a fuel high-connection line.
  • the fuel injection valves are unthrottled with each other and preferably also unthrottled with the high pressure feed pump fluidly connected.
  • the second high-pressure port of the second fuel injection valve is closed by means of a plug.
  • each fuel injection valve preferably has a discrete storage chamber and a throttle device, as described above.
  • the functionality, execution possibilities and dimensioning are in the document WO 2007/009279 A1 disclosed to allow optimal injection operations under all operating conditions.
  • the second high-pressure fuel line or the second high-pressure fuel lines are provided with in-plane curvatures - that is to say that the center line of the second high-pressure fuel line lies in the plane.
  • Such high-pressure fuel lines can be produced in a simple manner, and this is made possible by the fact that the identically designed injection valves are arranged parallel to each other and their high-pressure connections in the common pad, preferably in the connection plane lie.
  • all second high pressure fuel lines - that is, their centerlines - lie in a single plane, and more preferably, the longitudinal axes of the fuel injectors and their connection axes are in the same single plane as the second high pressure fuel lines. If the fuel injection valves are arranged equidistantly, all second high-pressure fuel lines can be made identical.
  • fuel injector and the device shown with such injectors are intended for an ignition system for large reciprocating engines, which are operated with gas and / or diesel, also called “dual fuel” engines. Since these are very high power engines, the injectors can have a large overall length, as shown in the drawing.
  • the injection valves serve, so to speak, as a pilot valve for igniting the main charge of fuel. Injectors and devices of the inventive type, however, can also be used - for engines of lower power - for injecting the main charge.
  • the inventive fuel injection valve 10 for intermittent injection of fuel under very high pressure in the combustion chamber of an internal combustion engine, a valve housing 12, which defines a longitudinal axis 14 and in which a high-pressure chamber 16 is present.
  • the valve housing 12 carries at its injection-side end a nozzle body 18 which defines a nozzle chamber connected to the high-pressure chamber 16.
  • connection part 20 which forms a connection head 20 'of the fuel injection valve 10.
  • connection part 20 is formed by a connection body 20 '.
  • connection part 20 or connection head 20 ' two identically formed high-pressure connections 22, 24 are formed, which each define a connection axis 22' or 24 '.
  • the two high-pressure ports 22, 24 are the same direction and their connection axes 22 ', 24' are parallel to each other.
  • connection axis 22 'of the first high pressure port 22 is aligned with the longitudinal axis 14; the latter and the two connection axes 22 'and 24' lie in a common plane 26, which with the sectional plane II-II of FIG. 1 and the drawing plane of the FIG. 2 coincides.
  • connection line 28 in particular in the connection head 20 ', formed on the connection part 20.
  • a first section 28 'of the connecting line 28 connects the first high-pressure connection 22 to the high-pressure chamber 16. From this first section 28', a second section 28 "branches off the connecting line, which leads to the second high-pressure connection 24.
  • the connecting line 28 has no throttles; are the high pressure ports 22, 24 formed without throttles.
  • connection plane 30 extends at right angles to the longitudinal axis 14 and thus also at right angles to the connection axes 22 ', 24'.
  • connection body 20 'forming the connection part 20 is L-shaped, wherein the leg 32 extending in the direction of the longitudinal axis 14 has a circular cross-section and the connection leg 34 extending at right angles thereto is cuboidal; the latter forms the connection head 20 '.
  • a low-pressure fuel return port 36 is arranged, and on a side surface extending at right angles thereto There is a designed in the manner of a socket electrical connection 38th
  • a circular cylindrical storage body 46 which is held by a first union nut 48 in close contact.
  • the storage body 46 forms part of the valve housing 12.
  • connection body 20 At the connection body 20 'facing away from the end of the storage body 46 is located on this an intermediate body 50 of the valve housing 12 at. Its outer contour is circular cylindrical.
  • a valve body 52 On the side facing away from the storage body 46 of the intermediate body 50 is located on this a valve body 52 at. At this attacks a second union nut 54, which comprises the intermediate body 50 and the other end is threaded into an external thread of the storage body 46. By means of the second union nut 54, the valve body 52 on the intermediate body 50, and the latter on the storage body 46, held in sealing engagement.
  • valve body 52 of the nozzle body 18 At the free end of the valve body 52 of the nozzle body 18 abuts, which in turn is sealed by a third union nut 56 on the valve body 52.
  • the two high pressure ports 22, 24 are formed by circular in cross-section recesses 58 in the connection body 20 ⁇ concentric to the respective connection axes 22 ', 24'.
  • the high-pressure connections 22, 24, or the recesses 58 forming them have a circular-cylindrical first section 60 adjoining the connection plane 30 after a chamfering.
  • the jacket wall of this first section 60 serves as a low-pressure sealing surface 60 ', as will be described later in connection with FIGS FIGS. 7 to 10 is explained.
  • the first section 60 is followed, in the direction towards the interior of the connection body 20 ', by a conically tapering shoulder, to which a circular cylindrical second section 62 adjoins.
  • the jacket wall of this second section 62 is formed as an internal thread 62 '.
  • the plane, perpendicular to the respective connection axis 22 ', 24' extending bottom of the recess 58 is designated 64.
  • each of the two high-pressure ports 22, 24 has a conically tapering high-pressure sealing surface 66 which extends from the bottom 64 and whose axis coincides with the relevant connecting shaft 22 ', 24'.
  • a blind hole 70 which opens into a transverse bore 72, which in turn opens into the longitudinal bore 68.
  • the transverse bore 72 extends at right angles to the longitudinal axis 14 and the connection axes 22 ', 24' and in the plane 26. It is formed by the second high-pressure port 24 closer side surface 74 of the connecting leg 34 forth to the longitudinal bore 68, wherein they, in a the side surface 74 adjacent end portion has a larger cross section, and stepwise tapered, is formed.
  • a sealing ball 76 is arranged, which is held by means of an indented and sealed in the end region Andrückstopfens 78 such that it seals the transverse bore 72 high pressure moderately.
  • the transverse bore 72 subsequent to the End region have a conically tapered sealing surface against which the sealing ball 76 is pressed.
  • leakage bevels 82 Further extending from the bottom 64 of the recesses 58 of the two high pressure ports 22, 24 from the facing sides leakage bevels 82, which open into one another.
  • the high-pressure connection-side openings of the leakage orifices 82 lie in the radial direction outside the high-pressure sealing surfaces 66 and likewise form leakage monitoring openings.
  • leakage bores such as the leakage longitudinal bore 80 and leakage orifices 82, are not necessary if leak monitoring is dispensed with.
  • the functioning of the leakage monitoring will be further discussed below FIGS. 7 to 10 explained in more detail.
  • the leakage longitudinal bore 80 in the exemplary embodiment shown serves to monitor the sealing of the connecting line 28 by means of the sealing ball 76.
  • the storage body 46 has a blind hole, which is produced from the end face facing the connection body 20 'in the mounted state, to the cross section of the connection line of larger diameter. In the illustrated embodiment, this diameter is about 1/3 of the outer diameter of the circular cylindrical storage body 46.
  • the blind hole serves to form a discrete storage chamber 84 for the fuel under high pressure. From the end face of the storage body 46 facing away in the connecting body 20 ', a connecting bore 86 extends to the bottom of the storage chamber 84, with an angle relative to the longitudinal axis 14.
  • the blind hole has a larger diameter in order to support a shoulder for supporting a valve carrier 88 of a check valve 90.
  • the check valve seat 92 is formed by an annular, around the mouth of the connecting line 28 extending around part of the storage body 46 facing the end face of the connection body 20 '.
  • a plate-shaped check valve body 94 cooperates with the check valve seat 92, which center has, on the longitudinal axis 14, a continuous throttle bore 96.
  • the check valve body 94 is formed by means of a compression spring designed as a closing spring 98, which in the other end is supported on the valve carrier 88, with an in Closing position of the check valve 90 directed closing force applied.
  • valve carrier 88 Centrally through the valve carrier 88 passes through a passage 100 at least approximately the same cross section as the connecting line 28. Incidentally, the valve carrier 88 closes the storage chamber 84 in the axial direction to the connecting body 20 'out from.
  • the check valve 90 which forms a throttle device, allows the flow of high pressure fuel from the high pressure ports 22, 24 into the storage chamber 84 at least approximately unhindered and throttles the flow in the opposite direction.
  • the throttling action of the check valve 90 is designed so that each fuel injector 10 during an injection high-pressure fuel from the storage chambers 86 other fuel injectors 10, from the high-pressure fuel lines 164, 164 'and from the high-pressure conveyor 166 flows.
  • This functionality is in the document WO 2007/009279 A1 in detail and also in the document WO 2009/033304 A1 described. It is explicitly referred to these documents.
  • a filter 102 in the present case a cup-shaped hole filter, fixed, which protrudes from the valve carrier 88 into the interior of the storage chamber 84 and in which the passage 100 opens through the valve carrier 88.
  • the filter 102 and the check valve 90 may be formed differently, preferred embodiments will be apparent from the document WO 2009/033304 A1 out.
  • the filter 102 prevents solid particles from entering the high-pressure chamber 16 and impairing the function of the fuel injection valve 10.
  • a channel 104 extends through the wall of the storage body 46 delimiting the storage chamber 84 in the longitudinal direction.
  • a corresponding channel is also formed on the connection body 20 ', which is aligned with the channel 104 and leads to the electrical connection 38. From this leads an electrical control line 106 through the channel 104 in the connector body 20 'and storage body 46 to terminal contacts 108, which protrude into the channel 104 in the assembled state.
  • the storage body 46 has a recess facing away from the connection body 20 'and facing the intermediate body 50 facing end face recess in which a compression spring 110 is arranged. This serves to hold an electrically controlled actuator arrangement 112 in a corresponding recess in the intermediate body 50.
  • the actuator arrangement 112 is electrically connected to the connection contacts 108 and via the latter and the electrical control line 106 to the electrical connection 38.
  • Such actuator arrangements 112 are generally known and in the present case designed as in FIG. 5 of the document WO 2008/046238 A2 shown and described in detail.
  • the differently designed actuator arrangements, as disclosed in said document, can be used in the present fuel injection valve 10. Regarding construction and operation is expressly on the document WO 2008/046238 A directed.
  • the actuator arrangement 112 is accommodated in an actuator receiving recess 113 of the intermediate body 50, which is arranged laterally offset with respect to the longitudinal axis 14. This provides space for another connection bore 86 'which is fluidly connected to the communication bore 86 and extends parallel to the longitudinal axis 14 through the intermediate body 50.
  • the actuator assembly 112 has an actuating shaft 114, which is biased by means of an actuator spring 116 in the closing direction of a pilot valve 118 and against the force of the actuator spring 116 by means of an electromagnet 120 in the opening direction of the pilot valve 118 is movable.
  • the solenoid 120 is driven by an electrical controller which supplies the control signals to the electrical connection 38.
  • valve body 52 has a cross-sectionally circular, multi-stepped, continuous in the axial direction and to this concentric Ventil stresses originallyung 124, in which a needle-shaped injection valve member 126 slidable in the axial direction and a hydraulic control device 128 for controlling the movement of the injection valve member 126 in known manner are included.
  • the injection valve member 126 protrudes into the cup-shaped nozzle body 18 and acts there in a known manner with an injection valve seat 130 together to connect through nozzle openings 132 with the high-pressure chamber 16 and separate from it.
  • an injection valve seat 130 together to connect through nozzle openings 132 with the high-pressure chamber 16 and separate from it.
  • a compression spring 134 is supported on the one hand in a known manner on the injection valve member 126 and acts on this with a directed in the direction against the injection valve seat 130 closing force.
  • the compression spring 134 is supported on a guide sleeve 136, which is thereby pressed sealingly against an intermediate plate 138.
  • control piston 140 In this side end region of the injection valve member is designed as a control piston 140 which is guided in the guide sleeve 136 in close sliding fit.
  • the control piston together with the guide sleeve, delimit a control arm 142 against the high-pressure chamber 16.
  • the needle-shaped injection valve member 122 is guided on the one hand on the guide sleeve 136 and on the other hand with radially projecting guide lips on the nozzle body 18.
  • the control device 128 has an intermediate valve 145 with an intermediate valve member 146 which, in the open position, releases a high-pressure passage 148 which leads from the high-pressure chamber 16 into the control chamber 142 and closes in the closed position to separate the control chamber 142 from the high-pressure chamber 116 ,
  • the intermediate valve member 146 permanently separates the control chamber 142 from a valve chamber 150, with the exception of a throttle passage 152, via which the control chamber 142 with the valve chamber 150 are permanently connected to one another via a small flow cross section.
  • the intermediate valve member 146 is mushroom-shaped, wherein the stem is guided in a sliding fit in a passage of the intermediate plate 138 and arranged in the control chamber 142 mushroom head in closed position against the intermediate plate 138 to close the arranged in this area muzzle of the high pressure passage 148 , If the mushroom head lifted from the intermediate plate 138, the fuel between this and the guide sleeve 136 can flow into the control chamber 142 therethrough.
  • the intermediate plate 138 sealingly abuts against a further intermediate plate 154, which is held in a predefined rotational position in the valve housing 112 by means of a positioning pin 156 and which, together with the intermediate plate 138 and the intermediate valve member 146 or the mushroom trunk thereof Valve space 150 limited.
  • the further intermediate plate 154 In alignment with the axis of the actuator assembly 112, the further intermediate plate 154 has an outlet passage 158, which is tapered in a stepwise manner from the valve space 150 in the direction of the actuator arrangement 112.
  • the outlet passage 158 can be closed by means of the pilot valve member 122 controlled by the actuator arrangement 112 or can be released to the low-pressure fuel return 123.
  • the further intermediate plate 154 forms a pilot valve seat of the pilot valve 118 which cooperates with the pilot valve member 122, with an annular region extending around the mouth of the outlet passage 158.
  • FIG. 5 shows a part of a device for intermittent injection of fuel into a number of combustion chambers of an internal combustion engine 44. Of these, in the FIG. 5 only shown a cylinder head 42 associated with two combustion chambers. In a known manner, the cylinder head 42 per combustion chamber on a fuel injection valve receiving passage, in each of which a fuel injection valve 10, as shown in the FIGS. 1 to 4 shown and described above, is used.
  • injection valves 10 are attached to the cylinder head 42.
  • connection part 20 or connection body 20 ' With their connection part 20 or connection body 20 ', the injection valves 10 project beyond the cylinder head 42 and the high-pressure connections 22, 24 are located on the connection plane 30 facing away from the cylinder head 42 and are thus freely accessible.
  • a first high-pressure fuel line 164 forms a high-pressure fuel feed line and is connected, on the one hand, to a high-pressure feed pump 166 and, on the other hand, to the first high-pressure port 22 of a first injection valve 10 of the series of injection valves.
  • a second high pressure fuel line 164 ' is connected, which on the other hand is connected to the first high pressure port 22 of the next following fuel injection valve 10.
  • FIGS. 5 and 6 2 a further second high-pressure fuel line 164 'is shown, which connects the second high-pressure port 24 of the second fuel injection valve 10 to the first high-pressure port 22 of a not-shown next-following fuel injection valve 10.
  • the second high pressure fuel lines form high fuel pressure connection lines.
  • the second high pressure port 24 is closed by a plug.
  • FIG. 6 shows the same arrangement of fuel injection valves 10 and high pressure fuel lines 164, 164 ', as FIG. 5 , but without cylinder head 42.
  • the centerlines 168 of the second high pressure fuel lines 164 'forming fuel high pressure communication lines are also in the same plane 26. In the illustrated embodiment, this also applies to the first high pressure fuel line 164.
  • connection levels 30 of all interconnected fuel injection valves 10 are also in one plane.
  • the advantage of this arrangement is that the second high-pressure fuel lines 164 ', and in the present case also the first high-pressure fuel line 164, only have to have two 90 ° bends lying in the plane 26 and can be assembled and disassembled in a simple manner.
  • An inner tube 170 is for Guiding the under very high pressure fuel determined. It has at both ends a conically tapering towards the free end, in the radial direction outside lying high pressure sealing surface 172, which is intended in the assembled state to cooperate with the high pressure sealing surface 66 of the respective high pressure port 22, 24.
  • the inner tube 170 extends within a (thin-walled) outer tube 174, wherein between the outer tube 174 and the inner tube 170, a leakage return gap 176 is present.
  • the connecting nut 178 is provided in an end region facing the free end of the high-pressure fuel line 164, 164 'with an external thread 180 which is intended to be threaded into the internal thread 62' of the second section 62 of the respective high-pressure port 22, 24.
  • connection nut 178 has a radially outwardly open circumferential groove into which an O-ring 182 is inserted, which in the assembled state with the sealing surface 60 'in the first section 60 of the respective high-pressure port 22, 24 cooperates to the interior of the recess 58 to seal against the environment.
  • the terminal nut 178 has a nut passage 184 extending therethrough in the axial direction, through which the inner tube 170 passes to form a gap 186.
  • the mother passage 184 In its two-sided end portions of the mother passage 184 is formed larger in diameter.
  • the external thread 180 facing away from the first end portion 190 engages the outer tube 174, on the outside of another O-ring 182 'sealingly applied, which on the other hand is received in an inner circumferential groove of the connecting nut 178.
  • a mounting sleeve 192 is arranged, the construction of particularly good FIG. 10 evident. It has in the axial direction in a central portion of an internal thread 194, by means of which it is threaded onto a corresponding external thread of the inner tube 170.
  • the fastening sleeve 194 has four cross-shaped, groove-shaped leakage recesses 196 extending in the radial direction.
  • the fastening sleeve 192 is provided on the outside with a cone taper 198, which cooperates with a corresponding cone support surface 200 on the mother passage 184.
  • the high-pressure sealing surface 172 of the inner tube 170 is held by means of the connecting nut 178 via the fastening sleeve 192 in close contact with the high-pressure sealing surface 66 of the respective high-pressure port 22, 24.
  • the leakage fuel can pass through the leakage recesses 196 in the radially outwardly of the terminal nut 178 limited gap 186. This is fluidly connected to the leakage return gap 176 between the inner tube 170 and the outer tube 174. If the inner tube 170 licks itself, the leakage fuel in question is caught in the outer tube 174.
  • connection parts 20 the gaps 186 and thus the leakage return gaps 176 of the high-pressure fuel lines 164, 164 'are flow-connected to one another by means of the leakage bevel bores 182.
  • Leckagellindsbohrung 80 which can be determined by a simple manner a possible leakage of fuel.
  • a single leakage sensor which is preferably arranged at the beginning or at the end of the line system, thus suffices to monitor the entire device for leakage.
  • the fuel injection valves 10 are sequentially controlled in a predetermined order for injection of very high pressure fuel.
  • the pilot valve 180 in the closing and the intermediate valve 145 in the open position and the injection valve member 126 sealingly against the injection valve 130 at.
  • the actuator assembly 112 of the respective fuel injection valve 10 is electrically energized, whereby the pilot valve member 122 is released.
  • the pilot valve member 122 is lifted from its attachment to the further intermediate plate 154, after which fuel from the valve chamber 150 into the low-pressure fuel return 123 flows.
  • the intermediate valve 145 is closed, so that in the control chamber 142 can not flow under high pressure fuel from the high-pressure chamber 16.
  • the actuator assembly 112 is de-energized, resulting in the closure of the pilot valve 118.
  • the pressure in the valve chamber 150 rises, as fuel can flow through the throttle bore 96 out of the control chamber 142.
  • the intermediate valve 145 opens and the subsequent flow of high-pressure fuel from the high-pressure chamber 16 into the control chamber 142 is released. This leads to a rapid pressure increase in the control chamber 142, which leads to the movement of the injection valve member 162 to the injection valve seat 130 and the termination of the injection process.
  • the pressure in the high-pressure chamber 16 drops.
  • the discrete storage chambers 84 and provided with the throttle bore 96 check valve 90 can now during an injection process fuel from the high-pressure pump 166, the high-pressure fuel lines 164, 164 'and other fuel injectors 10 in the injecting fuel injector 10 nachfliessen. This ensures optimum injection processes with smaller discrete storage chambers 46 and thus less space consuming fuel injectors 10, without a large storage chamber in the form of a "common rail" is present.

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

Claims (16)

  1. Soupape d'injection de carburant pour l'injection intermittente de carburant dans la chambre de combustion d'un moteur à combustion interne, présentant un boîtier de soupape (12) comprenant un espace haute pression (16) avec une chambre distincte d'accumulation (84) et définissant un axe longitudinal (14), lequel boîtier de soupape d'un côté, supporte un corps de buse (18) connecté à l'espace haute pression (16) et, de l'autre côté, présente une pièce de raccordement (20) avec deux raccordements haute pression (22, 24) pour des conduites haute pression de carburant (164, 164') qui définissent chacun un axe de raccordement (22', 24') et sont connectés à l'espace haute pression (16) et l'un à l'autre sans étranglement, caractérisée en ce que les raccordements haute pression (22, 24) sont disposés dans une surface de raccordement (30') commune de la pièce de raccordement (20) de telle sorte qu'ils sont orientés dans la même direction et que leurs axes de raccordement (22', 24') sont parallèles, chacun des deux raccordements haute pression (22, 24) présentant une surface d'étanchéité haute pression (66) se rétrécissant de façon conique à partir d'un fond (64) du raccordement haute pression (22, 24) concerné, l'axe de la surface d'étanchéité haute pression coïncidant avec l'axe de raccordement (22', 24') concerné, un forage longitudinal (68) s'étendant, de façon concentrique par rapport à l'axe de raccordement (22') et l'axe longitudinal (14), de la surface d'étanchéité haute pression (66) du premier raccordement haute pression (22) à travers un corps de raccordement (20') formant la pièce de raccordement (20) jusqu'à la face frontale opposée aux raccordements haute pression (22, 24), un forage borgne (70) s'étendant de la surface d'étanchéité haute pression (66) du second raccordement haute pression (24) dans la direction de l'axe de raccordement (24') et débouchant dans un forage transversal (72), qui à son tour débouche dans le forage longitudinal (68), et le forage longitudinal (68), le forage borgne (70) et le forage transversal (72) forment une conduite de raccordement (28).
  2. Soupape d'injection de carburant selon la revendication 1, caractérisée par un dispositif d'étranglement (90) qui permet l'écoulement du carburant des raccordements haute pression (22, 24) dans la chambre distincte d'accumulation (84) de façon au moins approximativement sans obstacle et qui étrangle l'écoulement dans la direction opposée.
  3. Soupape d'injection de carburant selon la revendication 2, caractérisée en ce que le dispositif d'étranglement (90) se présente sous forme d'une soupape anti-retour (90) dont l'élément de soupape anti-retour est muni d'un trou d'étranglement (96).
  4. Soupape d'injection de carburant selon la revendication 3, caractérisée en ce qu'un corps d'accumulation (46) en forme de cylindre circulaire est ajusté contre la face frontale du corps de raccordement (20') opposée aux raccordements haute pression (22, 24), le corps d'accumulation étant maintenu en contact étanche au moyen d'un premier écrou de raccord (48) contre le corps de raccordement (20'), le corps d'accumulation (46) présente un forage borgne qui est usiné en partant de la face frontale orientée vers le corps de raccordement (20') dans l'état assemblé et qui a un diamètre plus grand que la section transversal de la conduite de raccordement (28), le forage borgne sert à la formation de la chambre distincte d'accumulation (84) pour le carburant sous haute pression, un forage de raccordement (86) s'étend, obliquement par rapport à l'axe longitudinal (14), de la face frontale du corps d'accumulation (46) opposée au corps de raccordement (20') vers le fond de la chambre d'accumulation (84), le forage borgne présentant un diamètre plus grand dans une zone d'extrémité orientée vers le corps de raccordement (20') afin de former un épaulement pour supporter un porte-soupape (88) de la soupape anti-retour (90), un siège de soupape anti-retour (92) est formé par une partie annulaire s'étendant autour de l'ouverture de la conduite de raccordement (28), de la partie frontale du corps de raccordement (20') orientée vers le corps d'accumulation (46),
    et un corps de soupape anti-retour (94) se présentant sous forme de plaque et formant l'élément de soupape anti-retour interagit avec le siège de soupape anti-retour (92), le corps de soupape anti-retour présentant le trou d'étranglement (96) continu centralement sur l'axe longitudinal (14).
  5. Soupape d'injection de carburant selon la revendication 4, caractérisée en ce que le corps de soupape anti-retour (94) est soumis à une force de fermeture dirigée vers une position fermée de la soupape anti-retour (90) au moyen d'un ressort de fermeture (98) qui se présente sous la forme d'un ressort de compression et qui s'appuie à l'autre extrémité sur le porte-soupape (88).
  6. Soupape d'injection de carburant selon la revendication 5, caractérisée en ce que un passage (100) de section transversale au moins approximativement la même que celle de la conduite de raccordement (28) s'étend centralement à travers le porte-soupape (88) et le porte-soupape (88) ferme la chambre d'accumulation (84) dans la direction axiale vers le corps de raccordement (20').
  7. Soupape d'injection de carburant selon l'une des revendications 1 à 6, caractérisée en ce que la surface de raccordement (30') est un plan de raccordement (30).
  8. Soupape d'injection de carburant selon la revendication 7, caractérisée en ce que le plan de raccordement (30) s'étend perpendiculairement à l'axe longitudinal (14).
  9. Soupape d'injection de carburant selon l'une des revendications 1 à 8, caractérisée en ce que les raccordements haute pression (22, 24) sont de forme identique.
  10. Soupape d'injection de carburant selon l'une des revendications 1 à 9, caractérisée en ce que les raccordements haute pression (22, 24) présentent en leur centre la surface d'étanchéité de raccordement (66) conique pour les conduites haute pression de carburant (164, 164') et présentent, en dehors des surfaces d'étanchéité de raccordement (66) dans la direction radiale, des ouvertures de surveillance de fuite (82) qui sont connectées l'une à l'autre.
  11. Soupape d'injection de carburant selon l'une des revendications 1 à 10, caractérisée en ce que le corps de buse (18) présente un siège de soupape d'injection (130) qui est connecté à l'espace haute pression (16) et avec lequel interagit un élément de soupape d'injection (126) disposé dans le boîtier de soupape (12) et ajustable dans la direction de l'axe longitudinal (14), un ressort de compression (134) s'appuie d'un côté sur l'élément de soupape d'injection (126) et exerce sur ce dernier une force de fermeture dirigée vers le siège de soupape d'injection (130) et s'appuie de l'autre côté sur un manchon de guidage (136) et ce faisant appuie le manchon de guidage (136) de façon étanche contre une plaque intermédiaire (138), le manchon de guidage (136) ensemble avec un piston de contrôle (140), guidé dans ce manchon de guidage (136), de l'élément de soupape d'injection (126) délimite une chambre de contrôle (142) par rapport à l'espace haute pression (16), un dispositif de contrôle (128) pour le contrôle du mouvement axial de l'élément de soupape d'injection (126) par changement de la pression dans la chambre de contrôle (142) présente une soupape intermédiaire (145), dont l'élément de soupape intermédiaire (146) libère en position ouverte un passage haute pression (148), connecté à l'espace haute pression (16), vers la chambre de contrôle (142) et en position fermée, sépare la chambre de contrôle (142) du passage haute pression (148) et sépare de façon permanente la chambre de contrôle (142) d'une chambre de soupape (150) à l'exception d'un passage d'étranglement (152), et la chambre de soupape (150) pouvant être connectée à et distincte d'une conduite de retour de carburant basse pression (123) au moyen d'un dispositif à actuateur (112) commandé électriquement.
  12. Soupape d'injection de carburant selon la revendication 11, caractérisée en ce qu'un raccord de conduite de retour de carburant basse pression (36) ainsi qu'un raccordement électrique (38) connecté au dispositif à actuateur (112) sont disposés sur le corps de raccordement (20'), un corps intermédiaire (50), dans lequel le dispositif à actuateur (112) est disposé, du boîtier de soupape (12) est ajusté contre le corps d'accumulation (46), et un corps de soupape (52) du boîtier de soupape (12) est ajusté contre le corps intermédiaire (50), lequel corps de soupape supporte de l'autre côté le corps de buse (18) et dans lequel l'élément de soupape d'injection (126) et le dispositif de contrôle (128) sont disposés.
  13. Dispositif pour l'injection intermittente de carburant dans un certain nombre de chambres de combustion d'un moteur à combustion interne, avec une soupape d'injection de carburant (10) selon l'une des revendications 1 à 12 pour chaque chambre de combustion, les soupapes d'injection de carburant (10) étant de construction identique, une première conduite haute pression de carburant (164) - une conduite d'alimentation haute pression de carburant
    - est connectée à un premier des deux raccordements haute pression (22, 24) d'une première des soupapes d'injection de carburant (10), laquelle première conduite haute pression de carburant est reliée de l'autre côté à une pompe d'alimentation haute pression (166) pour l'alimentation en carburant des soupapes d'injection de carburant (10), et une deuxième conduite haute pression de carburant(164')
    - une conduite de raccordement haute pression de carburant - est connectée chaque fois au deuxième des deux raccordements haute pression (22, 24) des soupapes d'injection de carburant (10), laquelle deuxième conduite haute pression de carburant est reliée de l'autre côté à un premier raccordement haute pression (22) d'une soupape d'injection de carburant (10) suivante respectivement, pour la dernière des soupapes d'injection de carburant (10) toutefois, le deuxième raccordement haute pression (24) étant fermé au moyen d'un bouchon, et les soupapes d'injection de carburant étant connectées l'une à l'autre, préférablement à la pompe d'alimentation haute pression (166), sans étranglement.
  14. Dispositif selon la revendication 13, caractérisé en ce que la deuxième conduite haute pression de carburant (164') ou toutes les deux conduites haute pression de carburant (164'), présente, respectivement présentent, des courbures situées dans un seul plan (26).
  15. Dispositif selon la revendication 13 ou 14, caractérisé en ce que les deuxièmes conduites haute pression de carburant (164') sont situées dans un seul plan (26).
  16. Dispositif selon l'une des revendications 13 à 15, caractérisé en ce que les axes longitudinaux (14) des soupapes d'injection de carburant (10) et leurs axes de raccordement (22', 24') sont situés dans le même plan (26) que les deuxièmes conduites haute pression de carburant (164').
EP13702576.3A 2012-02-07 2013-02-01 Injecteur de carburant et dispositif d'injection de carburant Active EP2812559B1 (fr)

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PCT/EP2013/000318 WO2013117311A1 (fr) 2012-02-07 2013-02-01 Injecteur de carburant et dispositif pour l'injection de carburant

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EP (1) EP2812559B1 (fr)
JP (1) JP6141328B2 (fr)
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RU2014136326A (ru) 2016-03-27
CN104093968B (zh) 2016-10-12
KR101603029B1 (ko) 2016-03-11
US9587611B2 (en) 2017-03-07
WO2013117311A1 (fr) 2013-08-15
US20140360469A1 (en) 2014-12-11
EP2812559A1 (fr) 2014-12-17
KR20140109470A (ko) 2014-09-15
RU2607568C2 (ru) 2017-01-10
CN104093968A (zh) 2014-10-08
WO2013117311A9 (fr) 2014-08-21
JP6141328B2 (ja) 2017-06-07
JP2015506443A (ja) 2015-03-02

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