EP3613978B1 - Agencement d'une soupape d'injecteur de carburant sur un distributeur de carburant d'un moteur à combustion interne - Google Patents

Agencement d'une soupape d'injecteur de carburant sur un distributeur de carburant d'un moteur à combustion interne Download PDF

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Publication number
EP3613978B1
EP3613978B1 EP19188963.3A EP19188963A EP3613978B1 EP 3613978 B1 EP3613978 B1 EP 3613978B1 EP 19188963 A EP19188963 A EP 19188963A EP 3613978 B1 EP3613978 B1 EP 3613978B1
Authority
EP
European Patent Office
Prior art keywords
fuel
fuel injection
injection valve
receiving element
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19188963.3A
Other languages
German (de)
English (en)
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EP3613978A1 (fr
Inventor
Marcus GÖSCHEL
Paul Triebsch
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Volkswagen AG
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Volkswagen AG
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Publication date
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Publication of EP3613978A1 publication Critical patent/EP3613978A1/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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/242—Arrangement of spark plugs or 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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • 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
    • 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
    • F02M63/0275—Arrangement of 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/09—Fuel-injection apparatus having means for reducing noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/851—Mounting of fuel injection apparatus provisions for adjusting the angular, rotational or axial position of 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/852—Mounting of fuel injection apparatus provisions for mounting the fuel injection apparatus in a certain orientation, e.g. markings or notches
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/853—Mounting of fuel injection apparatus involving use of quick-acting mechanism, e.g. clips
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/855—Mounting of fuel injection apparatus using clamp elements or fastening means, e.g. bolts or screws
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/856—Mounting of fuel injection apparatus characterised by mounting injector to fuel or common rail, or vice versa

Definitions

  • the invention relates to an arrangement for connecting at least one fuel injector to a fuel distributor of a fuel injection system of an internal combustion engine, which is detachably attached to a cylinder head, the at least one fuel injector being detachably attached to a receiving element of the fuel distributor by means of a fixing element.
  • the pamphlet WO 2016/020255 A1 describes an arrangement for connecting a connecting part of a fuel injector to a cup of a fuel-carrying component, a connecting clip being provided.
  • the connecting clip connects the connection part of the fuel injector with the cup.
  • a contact contour provided on the connecting part and a contact contour provided on the connecting clip, at which contact is established between the connecting part and the connecting clip in the assembled state, are designed to be adapted to one another such that the connecting part can be supported on the connecting clip, which is Allows pivoting of the connecting part with respect to a longitudinal axis of the cup.
  • each of the fuel injection valves is arranged on a cup of the fuel distributor. At least one of the fuel injectors is attached to the associated cup by a retaining element.
  • the holding element has a support surface. On its underside, the cup has a contact surface with which the cup is supported by means of a damping layer on the support surface of the holding element. The holding element is fixed to the cup.
  • the fuel injector also has a collar that is supported on the retaining element. The damping layer allows damping of vibrations and thus a reduction in noise emissions.
  • the pamphlet DE 10 2008 002 122 A1 discloses a hold-down device for a fuel injector, which comprises at least one fuel injector, a receiving bore for the fuel injector and a connecting piece of a fuel rail.
  • the hold-down device can be clamped between a shoulder of the fuel injector and an end face of the connecting piece.
  • the hold-down device has a part-ring-shaped base element, from which an axially flexible hold-down clip extends, which has at least two webs, two inclined sections and two contact sections.
  • the basic element is designed as an upright partial ring, the wall thickness of which corresponds to the sheet thickness used.
  • the base element merges into the two webs of the hold-down bracket in such a way that the webs extending out of the plane of the base element face each other with their sheet metal broad sides and the webs are bent at their end facing away from the base element in such a way that from the bent end regions of the webs the Extend oblique sections so that the cut edges in the sheet now face each other.
  • the connecting bracket from the arrangement according to the publication WO 2016/020255 A1 and the hold-down according to the reference DE 10 2008 002 122 A1 represent geometrically complicated structures to be manufactured.
  • the holding element according to the publication WO 2013/170998 A1 is somewhat simpler in terms of geometry.
  • the publications EP 0 945 611 A2 , U.S. 5,806,494A , EP 2 905 461 A2 and DE 198 53 090 A1 called.
  • the print EP 2 905 461 A2 discloses a holder for fuel injection systems for holding a fuel injector at a connection point of a fuel-carrying component with a holding body and a clamping element, the holding body having at least one support surface has, on which the fuel injector can be supported, and wherein the holding body can be adjusted via the tensioning element relative to the component along an adjustment axis. Provision is made for the holding body to have at least one guide part which, in the assembled state, enables the holding body to be guided on the component along the adjustment axis.
  • the holding body has at least one further guide part, a tensioning part that interacts with the tensioning element, and a support part on which the support surface is configured, so that the further guide part enables the holding body to be guided on the component along the adjustment axis in the assembled state and that the clamping part is connected to the support part on the one hand via the guide part and on the other hand via the further guide part.
  • the invention is based on the object of creating another alternative, advantageous connection between a fuel injection valve and a fuel distributor of an internal combustion engine.
  • the starting point of the invention is an arrangement for connecting at least one fuel injector to a fuel distributor of a fuel injection system of an internal combustion engine, which is detachably attached to a cylinder head, the at least one fuel injector being detachably attached to a receiving element of the fuel distributor by means of a fixing element, with a surface of the receiving element facing away from the cylinder of the fuel distributor and a cylinder-facing surface of the fixing element in the assembled state of the cylinder head and fuel distributor and the fuel injector are designed as contact surfaces, by means of which an axial fixation and a radial alignment of the fuel injector in the cylinder head or in the receiving element of the fuel distributor can be effected by attaching the fixing element to the fuel injector is.
  • Such a contact surface positioning of the components mentioned relative to one another allows exact positioning, is robust and easy to implement.
  • the fixing element is a screw head.
  • the screw head has a blind hole which is provided with an internal thread.
  • the blind hole faces the surface of the receiving element that faces away from the cylinder, the cylinder-facing surface being formed around the blind hole of the fixing element.
  • the internal thread of the blind hole corresponds to an external thread of a fuel connector of the fuel injector, which is designed as a threaded bolt.
  • the fixing element is screwed with its internal thread onto the external thread of the fuel connector, so that the contact surfaces come into contact, with the screwing effect causing an axial pull-in torque, as a result of which the fuel injector is arranged axially in the longitudinal extension of the fuel injector and the through-opening of the receiving element in its end position, wherein
  • the longitudinal central axis of the fuel injector is also radially aligned via the contact surfaces with respect to a longitudinal axis of an installation channel and within the through-openings of the receiving element, so that the fuel injector is also arranged radially in its end position.
  • the arrangement is characterized in that the fuel injector is arranged in the pre-position relative to the installation channel and the through-opening relative to the receiving element of the fuel distributor with little play and at the same time secured against rotation, and the fuel connector of the fuel injector has a projection over the surface facing away from the cylinder.
  • the fixing element has a polygonal socket in which a tool engages in order to exert a rotational movement of the fixing element that fixes the fuel injector on the receiving element.
  • the inner polygon is open one of the blind hole of the fixing element opposite side of the fixing element arranged.
  • the fixing element In the assembled state - with the receiving element of the fuel distributor arranged in between - the fixing element is connected to the fuel injection valve (injector), which is formed from the injector body and an injector tip, the injector tip and injector body and fuel connection piece of the fuel injection valve and the blind hole and the polygon socket of the fixing element being on a common lie along the longitudinal axis.
  • injector injector
  • the contact surfaces are flat surfaces, by means of which an axial fixation and radial alignment of the fuel injector in the cylinder head and on the cylinder head and relative to the receiving element of the fuel rail is brought about by the cylinder-facing surface of the fixing element relative to the previously pre-positioned cylinder-facing surface of the receiving element is brought into contact, which can be braced axially on the surface of the receiving element facing away from the cylinder by exerting a rotary movement of the fixing element, with a radial alignment of the fuel injector taking place at the same time, since the contact surfaces advantageously also bring about an end positioning of the fuel injector due to the axial bracing .
  • the fixing element is screwed with its internal thread onto the external thread of the fuel connector, so that the contact surfaces of the fuel injector and the receiving element of the fuel distributor come into contact, with the screwing effect causing an axial pull-in torque, as a result of which the fuel injector is pushed axially in the longitudinal extension of the fuel injector and the through-opening of the receiving element is brought to its end position, with the longitudinal center axis of the fuel injector also being radially aligned with respect to a longitudinal axis of an installation channel and within the through-opening of the receiving element via the contact surfaces, so that the fuel injector is also brought radially into its end position.
  • the invention relates to a fuel injection system of an internal combustion engine with an arrangement for connecting at least one fuel injector to a fuel distributor of the fuel injection system, the at least one fuel injector being detachably attached to a receiving element of the fuel distributor by means of a fixing element, it being provided that a cylinder-facing surface of the receiving element of the fuel distributor and a cylinder-facing surface of the fixing element in the assembled state of the cylinder head and the fuel rail and the fuel injector are designed as contact surfaces, by means of which an axial fixation and a radial alignment of the fuel injector in and on the cylinder head or in the receiving element of the fuel rail can be effected by attaching the fixing element to the fuel injector, which is characterized in that the fixing element is a screw head which has a blind hole, which is provided with an internal thread, which faces the cylinder-facing surface of the receiving element in the assembled state, wherein the cylinder-facing surface is formed around the blind hole of the fixing element, and the internal thread of the blind hole with an external thread of
  • the figure shows a section through the longitudinal center axis of a fuel injector in its installed position in a cylinder head with a cylinder head also shown in section and an associated fuel distributor (rail).
  • the figure shows a cylinder head 100 of an internal combustion engine in a sectional view through a central axis X M of a fuel injection valve 300 which is arranged in cylinder head 100 .
  • a fuel distribution in the manner of a fuel distributor 200 in particular a fuel distributor strip—also called a rail— arranged on which mostly several fuel injectors 300 as shown in the figure are arranged.
  • Fuel rail 200 (rail) is used to store fuel that is under high pressure and to distribute the fuel to multiple fuel injectors 300, which are designed in particular as high-pressure injectors.
  • the high-pressure injection valves 300 and the fuel rail 200 (rail) are designed, for example, for operating pressures of more than 400 bar. Fuel injection valves 300 inject the fuel required for the combustion process under high pressure into a combustion chamber 115 of the internal combustion engine.
  • the fuel is compressed upstream of the fuel rail 200, mostly via a high-pressure pump, and delivered into the fuel rail 200 in a quantity-controlled manner via a high-pressure line.
  • the fuel travels from the rail via a channel-like opening 201 to fuel injectors 300, which has a correspondingly adapted opening 301.
  • the fuel flows from rail 200 into at least one or more fuel injectors 300 via openings 201, 301.
  • the arrangement is advantageously designed as a fuel injection system for high-pressure injection in internal combustion engines, the fuel injection system being provided in particular for mixture-compressing, spark-ignited internal combustion engines.
  • the fuel injection system is particularly suitable for gasoline direct injection, in particular for direct-injection turbocharged gasoline engines.
  • Fuel rail 200 comprises a receiving element 210 in the form of a cup 210 or a corresponding number of receiving elements 210 for each fuel injector 300 of the mostly multiple fuel injectors 300 arranged on fuel rail 200.
  • a cup 210 represents a component, in particular a cylindrical component, which has a through opening which is divided into sections or cup sections 210A and 210A 210B is designed according to the invention differently geometrically along the longitudinal extent of the through-opening, as will be explained in detail below.
  • the subject matter of the invention is an arrangement which is used to connect the fuel injection valve 300 to the cup 210 of the component carrying the fuel, in particular the fuel rail 200 .
  • the arrangement according to the invention is, for example, a fuel distribution rail 200 which is arranged on the side of a cylinder block, in particular the cylinder head 100 of the cylinder block.
  • the fuel rail 200 is fastened in a stationary manner to the cylinder head 100 via fastening elements that are not shown in detail.
  • fuel injectors 300 extending from fuel rail 200 are arranged essentially at right angles to the cylinder pistons in the cylinder block or--see figure--arranged obliquely downwards toward combustion chamber 115.
  • an injector body 340 of fuel injector 300 is supported in installation channel 110 of cylinder head 100, which is designed as a receiving bore.
  • the previous support of the fuel injectors 300 in the installation channel 110 of the cylinder head 100 has hitherto been disadvantageous at a step 110A of the installation channel 110 of the cylinder head 100 via a step 340A of the injector body 340 of the fuel injector 300.
  • the previous support of the fuel injector 300 in the cylinder head 100 leads to the introduction of structure-borne noise in the cylinder head 100 and the adjacent components such as a cylinder crankcase, a cylinder head cover and the fuel rail 200.
  • the present lateral arrangement of fuel injectors 300 in cylinder head 100 solves the problem of the small amount of installation space available to the side of cylinder head 100 and at the same time the problem of the transmission of structure-borne noise from fuel injectors 300 to cylinder head 100, in particular to the adjacent ones Components of fuel injector 300 or fuel injectors 300 are released, as will be explained in detail below.
  • a fixing element 330 of fuel injector 300 that is formed separately from fuel injector 300 represents the actual component for connecting fuel injector 300 to cup 210 of fuel rail 200 in a so-called assembled state, as will also be explained below.
  • An axial fastening area on fuel injector 300 is designed as fuel connector 301 of fuel injector 300, so that fuel injector 300 can be fastened to fuel rail 200, in particular to cup 210, by means of fixing element 330.
  • the fuel connector 302 is designed as a bolt which, viewed in the axial direction X M , protrudes beyond the surface A210 of the cup 210 facing away from the cylinder in the assembled state.
  • the bolt 302 has an external thread 302A at least in the area of the overhang.
  • fuel injector 300 is stationary in cup 210 and, in particular, is positioned so that it cannot rotate, so that surface A210 of cup 210 facing away from the cylinder can serve according to the invention as a predefinable mounting surface that is predefinably aligned in three-dimensional space.
  • a fuel injector 300 in the assembled state represents an assembly component which comprises fuel injector 300 with fuel connector 302 itself and fixing element 330 .
  • the fixing element 330 is connected to the fuel injection valve 300 (injector), which is formed from the injector body 340 and an injector tip 350, which are mostly of cylindrical design, as illustrated in the figure.
  • a circumferential seal 350A is arranged on the injector tip 350, which ensures sealing of the installation channel 110 on the fuel side, in particular a fuel-side seal of the injector tip 350 relative to the installation channel 110 of the cylinder head 100 and thus ultimately relative to the combustion chamber 115 in the cylinder block.
  • Fixing element 330, injector body 340 and injector tip 350 lie on an axis X, which is embodied as the longitudinal center axis X M of fuel injector 300.
  • Fuel injector 300 comprises a transition element 320, which branches off from the injector body, transition element 320 merging into a socket element 360 (not shown in detail), via which the electrical power supply of fuel injector 300 for triggering the injection takes place, which also extends slightly from cylinder head 100 in the Internal combustion engine protrudes.
  • the fixing element 330 has a blind hole 330A which, in the assembled state, faces the surface A210 of the cup 210 facing away from the cylinder.
  • the blind hole 330A is provided with an internal thread 330A-1, which corresponds to the external thread 302A of the fuel connector 302 designed as a threaded bolt.
  • a cylinder-facing surface A330 in the assembled state is formed around the blind hole 330A.
  • the surface A210 facing away from the cylinder (also referred to below as the cup-side contact surface) of cup 210 and the surface A330 facing the cylinder (also referred to below as the contact surface on the fixing element side) of fixing element 330 form contact surfaces A210, A330, by means of which an axial fixing and radial alignment of fuel injector 300 in the cylinder head 100 at the cup 210 of the fuel rail 200 is effected.
  • Fixing element 330 has a polygon socket 330B, which allows a screwing movement of fixing element 330 relative to fuel injector 300 previously positioned in cup 210 in a non-rotatable manner by means of a tool reaching into polygon socket 330B.
  • Fuel injector 300 has a small amount of play relative to the through-opening in cup 210 and installation channel 110 in the cylinder head, so that, starting from the non-rotatable pre-positioning after the screwing movement of fixing element 330 has been performed relative to cup 210, it reaches an axial end alignment and an axial final positioning of fuel injector 300 relative to cup 210 and relative to installation channel 110 in cylinder head 100.
  • fixing element 330 results in a two-dimensional final alignment and final positioning of fuel injector 300 in cylinder head 100 with the aid of positioned and appropriately aligned cup 210 on cylinder head 100, which is arranged between cylinder head 100 and fixing element 330.
  • the assembly took place in such a way that the fuel injector 300 is introduced into the installation channel 110 before the assembly of the fuel rail 200 .
  • the fuel nozzle 302 protrudes from the cylinder head 100 .
  • Fuel injectors 300 are automatically pre-positioned via injector tip 350 in installation channel 110 when fuel injectors 300 are pushed in such that injector tip 350 only comes into contact with seal 350A with installation channel 110, while injector body 340 has no contact points at all with installation channel 110 .
  • the ring seal represents a first sealing arrangement DA1 between combustion chamber 115 and installation channel 110 of cylinder head 100.
  • the structure-borne noise of the injector 300 is thus only slightly transmitted from the injector tip 350 to the cylinder head 100 via the seal 350 that dampens structure-borne noise.
  • a corresponding distance is also formed between the injector body 340 and the installation channel 110 , which prevents a direct transmission, in particular a direct transmission, of sound waves from the injector body 340 to the cylinder head 100 .
  • connection within the first sealing arrangement DA1 is still flexible enough that the distance, within certain tolerances, between the longitudinal axis of the installation channel 110 in the cylinder head 100 and the longitudinal center axis X M of the fuel injector 300 can be matched relative to one another by being fixed by means of the fixing element 330.
  • the through-opening which is formed in sections or cup sections 210A and 210B of cup 210, also has only a small amount of play relative to the lateral surface of fuel connector 302, so that the previously described pre-alignment or pre-positioning of fuel injector 300 occurs, cup 210 being the fuel rail 200 is attached to a designated position within the cylinder head, as is not shown in detail.
  • cup 210 is placed on fuel fitting 302, prepositioned fuel injector 300 is secured against rotation on cup 210.
  • Fuel injector 300 is then fixed via fixing element 330.
  • the fixing element 330 is screwed with its internal thread 330A-1 onto the external thread 302A of the fuel fitting, so that the contact surfaces A210, A330 come into contact, with the screwing effect causing an axial pull-in torque, as a result of which the fuel injector 300 is brought axially into its end position.
  • the radial alignment of the longitudinal center axis X M of the fuel injector 300 with respect to the longitudinal axis of the installation channel 110 takes place via the contact surfaces A210, A330, so that the fuel injector 300 is also brought radially into its end position.
  • longitudinal center axis X M of fuel injector 300 can be displaced by a small angular amount relative to the longitudinal axis of installation duct 110, which always ensures that fuel injector 300 is seated straight in installation duct 110, thereby avoiding contact points between injector body 340 and the installation channel 110 of the cylinder head 100 can be safely avoided.
  • fuel injector 300 is fastened to fuel rail 200 very simply and securely, with almost no play, which is also secured against twisting and which, within the framework of the available or intentionally made available tolerances, is able during pre-positioning in which Assembled state to compensate for the existing tolerances of the interconnected components, the connection overall requires only a small amount of space.
  • connection which requires little installation space, is particularly advantageous in the case of a lateral injector position, as has already been explained.
  • the connection also ensures that high pressures of over 400 bar can be applied to fuel injector 300, since the tightening element of fixing element 330 not only generates the forces for final alignment, but also the forces for sealing a second sealing arrangement DA2 and a third sealing arrangement DA3 provides.
  • the second sealing arrangement DA2 provides a seal between the through opening in the cup and the installation channel 110.
  • the third sealing arrangement DA3 ensures a seal between the contact surfaces A210, A330 of the cup 210 and the fixing element 330.
  • sealing systems which can be used for both sealing arrangements DA2, DA3, or two of the sealing systems mentioned below are used in combination for one or the other sealing arrangement.
  • the following sealing systems can be used, a cone-cone seat, a hemispherical cone seat, a metal bead seal, a biting edge, gluing, an O-ring, hemp tape or a non-ferrous metal sealing ring.
  • figure 1 an exemplary embodiment is shown in which the second sealing arrangement DA2 is designed as a cone-cone sealing seat and the third sealing arrangement DA3 is designed as a metal bead seal.
  • the second cup section 210B of the through-opening of cup 210 is conical, so that a cone formed between an intermediate connector 303 and the fuel connector 302 on fuel injector 300 in the assembled state engages in the conical through-opening of the second cup section 210B, thereby forming the corresponding sealing seat is.
  • the second cup section 210B transitions into the first cup section 210A, which is cylindrical and forms the fuel connector 302 at the end. It goes without saying that the intermediate connector 303 does not necessarily have to be arranged between the injector body 340 and the cone.
  • the third sealing arrangement DA3 takes place via the metal bead seal, with opposing beads S210 and S330 encircling the cup 210 and the fixing element 330 being formed in the opposing contact surfaces A210, A330.
  • a sealing element in particular a copper seal, is inserted in at least one of beads S210 and S330, which, as already explained above, ensures a tight seal between cup 210 and fixing element 300 after fixing element 330 has been appropriately attached and fuel injector 300 has been braced.
  • the invention thus creates a possibility of simply embodied axial fixing and radial alignment of fuel injector 300 in combination with the sealing of fuel injector 300 with respect to fuel rail 300, as well as a low-noise arrangement of fuel injector 300 in installation duct 110.
  • assembly is based on the following steps: a) Insertion of fuel injector 300 into cylinder head 100 into the opening provided for this purpose in cylinder head 100 and b) Placement of fuel rail 200 via the through-opening in fuel rail 200 onto fuel nozzle 302 designated bolt-like extension of fuel injector 300 and c) fixing fuel rail 200 to cylinder head 100, which serves as an attachment element for fuel rail 200, and finally d) fixing fuel injector 300 by means of fixing element 330 in the manner of a screw head on fuel rail 200.

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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 (11)

  1. Agencement destiné à relier au moins une soupape d'injecteur de carburant (300) à un distributeur de carburant (200) d'un système d'injection de carburant d'un moteur à combustion interne, lequel distributeur de carburant est fixé de manière détachable sur une culasse (100), l'au moins une soupape d'injecteur de carburant (300) étant fixée de manière détachable sur un élément de réception (210) du distributeur de carburant (200) au moyen d'un élément de fixation (330), une surface opposée au cylindre (A210) de l'élément de réception (210) du distributeur de carburant (200) et une surface tournée vers le cylindre (A330) de l'élément de fixation (330) étant réalisées, lorsque la culasse (100) et le distributeur de carburant (200) ainsi que la soupape d'injecteur de carburant (300) sont dans l'état assemblé, sous la forme de surfaces de contact (A210, A330), au moyen desquelles une fixation axiale et une orientation radiale de la soupape d'injecteur de carburant (300) respectivement dans la culasse (100) et dans l'élément de réception (210) du distributeur de carburant (200) peut être obtenue par le montage de l'élément de fixation (330) sur la soupape d'injecteur de carburant (300), l'élément de fixation (330) étant une tête de vis, qui comporte un trou borgne (330A) pourvu d'un filetage intérieur (330A-1), qui est tourné vers la surface opposée au cylindre (A210) de l'élément de réception (210) dans l'état assemblé, caractérisé en ce que la surface tournée vers le cylindre (A330) est réalisée autour du trou borgne (330A) de l'élément de fixation (330), et le filetage intérieur (330A-1) du trou borgne (330A) correspond à un filetage extérieur (302A) d'une tubulure de carburant (302), réalisée sous la forme d'un boulon fileté, de la soupape d'injecteur de carburant (300), l'élément de fixation (330) étant vissé avec son filetage intérieur (330A-1) sur le filetage extérieur (302A) de la tubulure de carburant (302), de telle sorte que les surfaces de contact (A210, A330) viennent en contact, un couple d'entraînement axial étant obtenu par l'action de vissage, moyennant quoi la soupape d'injecteur de carburant (300) est disposée dans sa position finale axialement dans la direction longitudinale de la soupape d'injecteur de carburant (300) et de l'ouverture de passage de l'élément de réception (210), une orientation radiale de l'axe médian longitudinal (XM) de la soupape d'injecteur de carburant (300) étant également effectuée, par le biais des surfaces de contact (A210, A330), par rapport à un axe longitudinal d'un conduit d'installation (110) et dans les ouvertures de passage de l'élément de réception (210), de telle sorte que la soupape d'injecteur de carburant (300) est également disposée radialement dans sa position finale.
  2. Agencement selon la revendication 1, caractérisé en ce qu'une ouverture de passage de l'élément de réception (210) et la surface opposée au cylindre (A210) de l'élément de réception (210) sont orientées de manière prédéfinissable dans l'état assemblé par la fixation de l'élément de réception (210) sur la culasse (100), de telle sorte qu'une disposition de la soupape d'injecteur de carburant (300) dans un conduit d'installation (110) de la culasse (100) et dans l'ouverture de passage de l'élément de réception (210) dans une position préalable est possible, le prépositionnement de l'élément de réception entraînant simultanément un prépositionnement de la surface opposée au cylindre (A210) de l'élément de réception (210).
  3. Agencement selon les revendications 1 et 2, caractérisé en ce que la soupape d'injecteur de carburant (300), dans la position préalable par rapport au conduit d'installation (110) et à l'ouverture de passage, est disposée par rapport à l'élément de réception (210) du distributeur de carburant (200) avec un faible jeu et simultanément sans possibilité de rotation et la tubulure de carburant (302) de la soupape d'injecteur de carburant (300) comporte une saillie au-dessus de la surface opposée au cylindre (A210).
  4. Agencement selon la revendication 1, caractérisé en ce que l'élément de fixation (330) comporte une empreinte polygonale en creux (330B), dans laquelle un outil vient en prise pour exercer un mouvement rotatif de l'élément de fixation (330) fixant la soupape d'injecteur de carburant (300) sur l'élément de réception (210).
  5. Agencement selon la revendication 1, caractérisé en ce que les surfaces de contact (A210, A330) sont des surfaces planes, au moyen desquelles une fixation axiale et une orientation radiale de la soupape d'injecteur de carburant (300) dans la culasse (100) et sur l'élément de réception (210) de la barre de distributeur de carburant (200) sont obtenues, du fait que la surface tournée vers le cylindre (A330) de l'élément de fixation (330) est amenée en appui contre la surface opposée au cylindre (A210) prépositionnée de l'élément de réception (210) et peut être serrée axialement par l'exercice d'un mouvement rotatif de l'élément de fixation (330), une orientation radiale de la soupape d'injecteur de carburant (300) étant effectuée simultanément, étant donné que les surfaces de contact (A210, A330) provoquent, par le serrage axial, un positionnement final de la soupape d'injecteur de carburant (300).
  6. Agencement selon la revendication 1, caractérisé en ce qu'un premier agencement d'étanchéité (DA1) est disposé entre la chambre de combustion (115) et le conduit d'installation (110) de la culasse (100), lequel est réalisé sous la forme d'une bague d'étanchéité, qui rend étanche une pointe (350) de la soupape d'injecteur de carburant (300) par rapport au conduit d'installation (110).
  7. Agencement selon la revendication 1, caractérisé en ce qu'un deuxième agencement d'étanchéité (DA2) est disposé entre l'ouverture de passage de l'élément de réception (210) du distributeur de carburant (200) et le conduit d'installation (110) de la soupape d'injecteur de carburant (300).
  8. Agencement selon la revendication 1, caractérisé en ce qu'un troisième agencement d'étanchéité (DA3) est disposé entre les surfaces de contact (A210, A330) de l'élément de réception (210) du distributeur de carburant (200) et de l'élément de fixation (330).
  9. Agencement selon les revendications 7 et 8, caractérisé en ce que le deuxième et le troisième agencement d'étanchéité (DA2, DA3) sont réalisés sous la forme d'un siège d'étanchéité cône/cône, d'un siège d'étanchéité demisphère/cône, d'un joint d'étanchéité métallique à moulures, d'une arête coupante, d'un joint collé, d'un joint torique, d'un joint de filasse en chanvre ou d'une bague d'étanchéité en métal non ferreux, les agencements d'étanchéité (DA2, DA3) étant réalisés sous la forme de systèmes d'étanchéité identiques ou de systèmes d'étanchéité différents.
  10. Procédé de fabrication d'un agencement selon au moins une quelconque des revendications 1 à 9, caractérisé par les étapes de montage :
    a) introduction d'une soupape d'injecteur de carburant (300) dans une culasse (100) dans l'ouverture d'un conduit d'installation (110) prévue à cet effet dans la culasse (100), et
    b) pose d'un distributeur de carburant (200) par le biais d'une ouverture de passage dans un élément de réception (210) du distributeur de carburant (200) sur un prolongement en forme de boulon de la soupape d'injecteur de carburant (300), réalisé sous la forme d'une tubulure de carburant (302), et
    c) fixation du distributeur de carburant (200) sur la culasse (100), qui sert d'élément de montage pour le distributeur de carburant (200), et
    d) fixation de la soupape d'injecteur de carburant (300) au moyen d'un élément de fixation (330) sur le distributeur de carburant (200), du fait que l'élément de fixation (330) est vissé avec son filetage intérieur (330A-1) sur le filetage extérieur (302A) de la tubulure de carburant (302), de telle sorte que des surfaces de contact (A210, A330) de la soupape d'injecteur de carburant (300) et de l'élément de réception (210) du distributeur de carburant (200) viennent en contact, un couple d'entraînement axial étant obtenu par l'action de vissage, moyennant quoi la soupape d'injecteur de carburant (300) est amenée dans sa position finale axialement dans la direction longitudinale de la soupape d'injecteur de carburant (300) et de l'ouverture de passage de l'élément de réception (210), une orientation radiale de l'axe médian longitudinal (XM) de la soupape d'injecteur de carburant (300) étant également effectuée, par le biais des surfaces de contact (A210, A330), par rapport à un axe longitudinal d'un conduit d'installation (110) et dans l'ouverture de passage de l'élément de réception (210), de telle sorte que la soupape d'injecteur de carburant (300) est également amenée radialement dans sa position finale.
  11. Système d'injection de carburant d'un moteur à combustion interne doté d'un agencement destiné à relier au moins une soupape d'injecteur de carburant (300) à un distributeur de carburant (200) du système d'injection de carburant, l'au moins une soupape d'injecteur de carburant (300) étant fixée de manière détachable sur un élément de réception (210) du distributeur de carburant (200) au moyen d'un élément de fixation (330), caractérisé en ce qu'une surface opposée au cylindre (A210) de l'élément de réception (210) du distributeur de carburant (200) et une surface tournée vers le cylindre (A330) de l'élément de fixation (330) sont réalisées, lorsque la culasse (100) et le distributeur de carburant (200) ainsi que la soupape d'injecteur de carburant (300) sont dans l'état assemblé, sous la forme de surfaces de contact (A210, A330), au moyen desquelles une fixation axiale et une orientation radiale de la soupape d'injecteur de carburant (300) respectivement dans la culasse (100) et dans l'élément de réception (210) de la barre de distributeur de carburant (200) peut être obtenue par le montage de l'élément de fixation (330) sur la soupape d'injecteur de carburant (300), l'élément de fixation (330) étant une tête de vis, qui comporte un trou borgne (330A) pourvu d'un filetage intérieur (330A-1), qui est tourné vers la surface opposée au cylindre (A210) de l'élément de réception (210) dans l'état assemblé, caractérisé en ce que la surface tournée vers le cylindre (A330) est réalisée autour du trou borgne (330A) de l'élément de fixation (330), et le filetage intérieur (330A-1) du trou borgne (330A) correspond à un filetage extérieur (302A) d'une tubulure de carburant (302), réalisée sous la forme d'un boulon fileté, de la soupape d'injecteur de carburant (300), l'élément de fixation (330) étant vissé avec son filetage intérieur (330A-1) sur le filetage extérieur (302A) de la tubulure de carburant (302) de la soupape d'injecteur de carburant (300), de telle sorte que les surfaces de contact (A210, A330) viennent en contact, un couple d'entraînement axial étant obtenu par l'action de vissage, moyennant quoi la soupape d'injecteur de carburant (300) est disposée dans sa position finale axialement dans la direction longitudinale de la soupape d'injecteur de carburant (300) et de l'ouverture de passage de l'élément de réception (210), une orientation radiale de l'axe médian longitudinal (XM) de la soupape d'injecteur de carburant (300) étant également effectuée, par le biais des surfaces de contact (A210, A330), par rapport à un axe longitudinal d'un conduit d'installation (110) et dans l'ouverture de passage de l'élément de réception (210), de telle sorte que la soupape d'injecteur de carburant (300) est également disposée radialement dans sa position finale.
EP19188963.3A 2018-08-20 2019-07-30 Agencement d'une soupape d'injecteur de carburant sur un distributeur de carburant d'un moteur à combustion interne Active EP3613978B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018120239.3A DE102018120239A1 (de) 2018-08-20 2018-08-20 Anordnung eines Brennstoffeinspritzventils an einem Kraftstoffverteiler einer Brennkraftmaschine

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EP3613978A1 EP3613978A1 (fr) 2020-02-26
EP3613978B1 true EP3613978B1 (fr) 2022-05-18

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US (1) US10815948B2 (fr)
EP (1) EP3613978B1 (fr)
CN (1) CN110848062B (fr)
DE (1) DE102018120239A1 (fr)

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DE102018120239A1 (de) 2020-02-20
CN110848062A (zh) 2020-02-28
EP3613978A1 (fr) 2020-02-26
US10815948B2 (en) 2020-10-27
US20200056573A1 (en) 2020-02-20
CN110848062B (zh) 2021-11-02

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