EP1982070B1 - High-pressure accumulator body with integrated distributor block - Google Patents

High-pressure accumulator body with integrated distributor block Download PDF

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Publication number
EP1982070B1
EP1982070B1 EP06830244A EP06830244A EP1982070B1 EP 1982070 B1 EP1982070 B1 EP 1982070B1 EP 06830244 A EP06830244 A EP 06830244A EP 06830244 A EP06830244 A EP 06830244A EP 1982070 B1 EP1982070 B1 EP 1982070B1
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EP
European Patent Office
Prior art keywords
pressure
pressure accumulator
throttle
integrated
volume
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
EP06830244A
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German (de)
French (fr)
Other versions
EP1982070A1 (en
Inventor
Christoph Weizenauer
Jochen Walther
Markus Degn
Gernot Payer
Sven Voelter
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1982070A1 publication Critical patent/EP1982070A1/en
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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
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • 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
    • F02M63/0285—Arrangement of common rails having more than one common rail
    • F02M63/0295—Arrangement of common rails having more than one common rail for V- or star- or boxer-engines
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
    • 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

Definitions

  • a fuel injection system for a multi-cylinder internal combustion engine having a first high-pressure accumulator and a second high-pressure accumulator and with a high-pressure pump in which a damping volume for damping pressure pulsations between the high-pressure accumulators and between the high-pressure accumulators and the high-pressure pump is integrated in one of the high-pressure accumulator is off EP 0 995 902 A2 known.
  • DE 100 60 785 A1 refers to a fuel injector with a high-pressure fuel storage.
  • branch pipes are screwed, each containing a throttle for reducing pressure pulsations in the fuel injection device.
  • the throttles are each formed as a pipe piece disposed at one end of the branch pipe to which a connection head is attached or inside the branch pipe near that end.
  • Throttle elements in high-pressure accumulators are used for pressure wave attenuation within the high-pressure accumulator body.
  • cylindrical throttle pieces in connection bores of the high-pressure accumulator (common rail) which lead to the individual fuel injectors or to the high-pressure accumulator acting on the high-pressure pump, pressed.
  • the throttle elements pressed into the connection bores serve to improve the damping of pressure oscillations within the fuel injection system and thereby make it possible to increase the pressure resistance of the individual components.
  • a fuel injector for a diesel engine.
  • a fuel injector comprises a high-pressure fuel storage and a plurality of the fuel discharge from the high-pressure fuel storage serving branch pipes. These each have at one end a connection head for connecting the branch pipe with an associated connection piece of the high-pressure fuel storage, wherein in each of the branch pipes, a throttle is mounted.
  • the throttle is formed in a carrier element which is fixed in the region of the connection head by fixing elements which are formed with the formation of the connection head and which narrow a clear width of the branch pipe on both sides of the carrier element.
  • the throttle is in the support member as a through hole with a first partial bore and a second partial bore, that is executed in two stages.
  • the through hole is secured during the upsetting of the connection head by an inserted, stepped cylindrical inner mandrel, which is designed to be traceable.
  • the carrier element preferably has a cylindrical lateral surface.
  • Internal combustion engines with six or more cylinders use two high-pressure accumulators, which supply the fuel injectors of the cylinders of a cylinder bank with fuel.
  • the two high-pressure accumulators (Common Rail) are connected to each other by a connecting line, which ensures a pressure equalization between the high-pressure accumulators.
  • a distributor block can additionally be used. The distributor block is acted upon by a high-pressure pump, which compresses the fuel to the system pressure and maintains this system pressure in the two high pressure accumulators. From the acted upon by the high-pressure pump manifold block in which vibrations are damped, the two high-pressure accumulator are supplied with fuel.
  • the distributor block is integrated into one of the two high-pressure accumulators supplying fuel to the multi-cylinder internal combustion engine.
  • This is preferably realized in that in the cavity of the respective high-pressure accumulator (common rail), a throttle is integrated.
  • a throttle is integrated in the cavity of the respective high-pressure accumulator (common rail).
  • the distributor block representing smaller volume of the respective high-pressure accumulator is located at the end of the high-pressure accumulator to which the branching from the high-pressure pump, the respective high-pressure accumulator fuel-supplying high pressure pumps are connected.
  • the other high-pressure accumulator is supplied from the mentioned high-pressure accumulator, in which the distributor block is integrated, via a connecting line with fuel whose outlet point is integrated in the further high-pressure accumulator, a damping throttle.
  • inventively proposed solution of the integration of the previously manufactured as a separate component manifold block in one of the high-pressure accumulator on the one hand, the use of a space-consuming separate component between the two high-pressure accumulators avoided, so that the installation space of the inventively proposed fuel injection system in the cylinder head area of a multi-cylinder internal combustion engine fails. Furthermore, a considerable cost advantage is achieved due to the avoidance of a separate flameproof component to be designed.
  • the distribution block integrated in one of the high-pressure accumulators likewise dampens Pressure oscillations that can occur in the fuel injection system and is therefore equivalent in function to a previously manufactured as a separate component manifold block.
  • this can also be integrated as Einpressdrossel a ring member and a throttle body in the cavity of the high-pressure accumulator.
  • the integrated throttle can be designed to comprise both a one-piece component and a multi-part component comprising an annular body and a throttle body.
  • the integrated throttle can also be designed as a clamped throttle, which is fixed by means of a ring tensioning element in the cavity of the respective high-pressure accumulator (common rail).
  • the position of the integrated throttle within the cavity of the high-pressure accumulator can be chosen arbitrarily, so that the two individual volumes within the high-pressure accumulator are freely selectable and freely definable.
  • the integrated throttle as a two-part component can be designed to comprise a screw part and a threaded part, wherein both the threaded part and the screw part are supported on a diameter step on the inner wall of the cavity of the high-pressure accumulator and are screwed against one another.
  • the screw connection integrates the integrated throttle in the cavity of the relevant high-pressure accumulator (common rail).
  • FIG. 1 The representation according to FIG. 1 is to be taken from a known from the prior art fuel injection system for multi-cylinder internal combustion engines, wherein the manifold block is designed as a separate component.
  • a fuel injection system 10 includes a high-pressure pump 12, which acts on a designed as a separate component manifold block 14 with fuel.
  • the lines extending from the high-pressure pump 12 to the manifold block 14 each have manifold block throttles 16, via which an attenuation of the pressure pulsations in the fuel injection system 10 takes place.
  • a first high-pressure accumulator 18 (common rail) and a second high-pressure accumulator 20 (common rail) are supplied with fuel under system pressure.
  • the system pressure prevailing in the first high-pressure accumulator 18 and the second high-pressure accumulator 20 depends on the design of the high-pressure pump 12.
  • the first high-pressure accumulator 18 is a rail pressure sensor 22 associated with the second high pressure accumulator 20, a pressure control valve 24.
  • the first high-pressure accumulator 18 is acted upon by the manifold block 14 via a pressure line, at the end of a damper throttle 26 is designed at the entrance of the first high-pressure accumulator 18.
  • Each of the two high-pressure accumulators 18 and 20 comprises four injector supply lines 28, in each of which a supply line throttle 30 can be integrated to pressure pulsations between the in FIG. 1 Not shown fuel injectors and the respective high-pressure accumulators 18 and 20 to attenuate.
  • a supply line throttle 30 can be integrated to pressure pulsations between the in FIG. 1 Not shown fuel injectors and the respective high-pressure accumulators 18 and 20 to attenuate.
  • the fuel injection system 10 are supplied via the two high-pressure accumulator 18 and 20 respectively four fuel injectors with fuel under system pressure standing, which are associated with the respective cylinder two cylinder banks of a multi-cylinder internal combustion engine.
  • the fuel injection system 10 has a high-pressure accumulator 40 with integrated manifold block.
  • the high-pressure accumulator 40 is designed to be longer with integrated manifold block compared to the second high-pressure accumulator 20.
  • Both high-pressure accumulator 20 and 40 are designed substantially tubular.
  • the high-pressure accumulator 40 with integrated manifold block is the rail pressure sensor 22 associated with the second high-pressure accumulator 20, the pressure control valve 24.
  • the high-pressure accumulators 20, 40 are each assigned four Injektorzutechnischen 28, in each of which a supply line throttle 30 is received. With the in FIG.
  • the fuel injection system 10 shown the cylinders of two cylinder banks of an 8-cylinder internal combustion engine can be supplied with system under pressure fuel.
  • the fuel injection system 10 as shown in FIG. 2 can of course also be modified so that a designed in V-shape six-cylinder engine can be equipped with it, instead of in FIG. 2 illustrated embodiment of the fuel injection system 10 for 8-cylinder internal combustion engines, internal combustion engines can be equipped with the present invention proposed fuel injection system, which have an even higher number of cylinders.
  • the high-pressure accumulator 40 with integrated manifold block has an integrated throttle 42 so that its total volume is divided into a first high-pressure accumulator volume 44 and a second high-pressure accumulator volume 46.
  • the first high-pressure accumulator volume 44 is dimensioned larger than the second high-pressure accumulator volume 46, which serves as an integrated distributor block within the high-pressure accumulator 40.
  • the second high-pressure accumulator volume 46 ie the distributor block integrated in the high-pressure accumulator 40, is preferably located at the end at which the high-pressure accumulator 40 with integrated manifold block is acted upon by high-pressure fuel via pressure lines 48 from the high-pressure pump 12.
  • each of the supply lines 48 between the high-pressure pump 12 and the second high-pressure accumulator volume 46 are pressure line throttles 50, 52, the pressure pulsations between the high-pressure accumulator 40 with integrated manifold block and the high-pressure pump 12 attenuate.
  • the second high-pressure accumulator volume 46 in the high-pressure accumulator 40 with integrated distributor block is connected to the second high-pressure accumulator 20 via a connecting line, which contains an attenuation restrictor 26.
  • the second high-pressure accumulator 20 is constructed as well as in FIG. 1 illustrated second high-pressure accumulator 20th
  • FIG. 2 Through the in FIG. 2 represented fuel injection system 10 according to the invention is in FIG. 1 as a separate component shown distributor block 14 saved, so that in the cylinder head area of a multi-cylinder internal combustion engine with two cylinder banks a smaller footprint for the inventively proposed fuel injection system 10 results.
  • Figure 3.1 is a procured as a through hole embodiment variant of the integrated throttle refer.
  • Figure 3.1 shows that the high pressure accumulator 40 with integrated manifold block has a cavity 54.
  • the cavity 54 is determined by a respective portion of a deep hole bore 56 introduced on both sides into the high-pressure accumulator 40 with an integrated distributor block.
  • an integrated throttle 42 which can be embodied as a through-bore 62 is executed.
  • the second high-pressure storage volume 46 within the cavity 54 formed by a portion of the deep hole bore 56 is limited on the one hand by the integrated throttle 42 and on the other hand by a port 64 to which the high pressure pump 12 is connected.
  • an integrated damper throttle 66 may be formed.
  • injection throttle 48 pressure pulsations between the in Figure 3.1 Not shown fuel injectors and the cavity 54 of the high-pressure accumulator 40 with integrated manifold block damped.
  • the representation according to Figure 3.2 shows a variant of the in Figure 3.1 illustrated integrated throttle.
  • the integrated throttle 42 is also designed as a through-drilled throttle 62 with a stepped throttle channel, but the facing end sides of the two bore portions of the deep hole bore 56 are provided in the high-pressure accumulator 40 with integrated manifold block each with a rounding 70. This favors the strength properties of the high-pressure accumulator 40 with integrated distributor block, since notch effect is avoided.
  • the cavity 54 and the second high-pressure accumulator volume 46 are supplied directly via the pressure acting on the port 64 via the pressure line 48 high-pressure pump 12 with high pressure fuel.
  • a further embodiment of the integrated throttle is shown, which is located in a sleeve-shaped component, which is embedded in the cavity of the high-pressure accumulator with integrated manifold block.
  • connection 64 for the pressure line 48 of the high-pressure pump 12 has a biting edge 64 which is fixed positively or positively in the bore diameter 46 and acts on the sleeve 72 with integrated throttle 42 inserted into the cavity 54.
  • biting edge 64 which is fixed positively or positively in the bore diameter 46 and acts on the sleeve 72 with integrated throttle 42 inserted into the cavity 54.
  • the wall 68 of the high-pressure accumulator 40 with an integrated distributor block are the already mentioned Einpressdrosseln 48 below the terminals 60, to which the Injektorzutechnischen 28 are connected to the standing under system pressure fuel injectors.
  • Figure 4.2 shows a variant of the in Figure 4.1 illustrated configuration.
  • the in F igur 4.1 shown components, namely the sleeve 72 and the port 64 for the pressure supply line 48 of the high-pressure pump as a common insert 78 are integrally executable.
  • the insert 78 includes the connection for the pressure line 48 of the high pressure pump 12 and the sleeve.
  • the one-piece insert 78 has a bottom surface, in which the integrated throttle 42 is also formed as a simple bore.
  • the first high-pressure accumulator volume 44 and the second high-pressure accumulator volume 46 are shown in the cavity 54 of the high-pressure accumulator 40 with integrated manifold block.
  • the damper throttles 30 are realized as simple bores in the wall 68 of the high-pressure accumulator 40 with integrated distributor block and are located below the connections 60 for the injector supply lines 38.
  • FIG. 5 is to take a variant for an integrated throttle, which is designed as Einpressdrossel.
  • the high-pressure accumulator 40 with integrated manifold block designed as a pressed throttle 80 integrated throttle 42 separates the second high-pressure accumulator volume 46 from the first high-pressure accumulator volume 44th
  • the size of the first high-pressure accumulator volume 44 and the size of the second high-pressure accumulator volume 46 in the cavity 54 of the high-pressure accumulator 40 with integrated manifold block can be exactly specified.
  • this has a ring body 82 and a throttle body 84.
  • the annular body 82 is located on an inner wall which bounds the cavity 54 of the high-pressure accumulator 40 with an integrated distributor block.
  • the damper throttles 30 are again designed as simple bores which run perpendicular to the cavity 54 below the connections 60 for the injector supply lines 28.
  • Figure 5.1 shows a variant of a designed as Einpresshrrossel integrated throttle according to FIG. 5 .
  • a diameter step 86 is formed, on which a collar of the throttle body 84 is supported.
  • the throttle body 84 is crossed by a throttle passage 88 having a diameter step and separates the first high-pressure accumulator 44 from the second high-pressure accumulator 46.
  • Figure 5.2 shows a variant of the integrated throttle, which is fixable by means of a ring tensioning element in the high-pressure accumulator with integrated manifold block.
  • a clamped throttle 92 is fixed via a ring clamping element 90 to the wall 68 on the inner wall 94 of the high pressure accumulator 40 with integrated manifold block.
  • the installation location of the integrated throttle 42 in the high-pressure accumulator 40 with integrated manifold block according to the distribution of the high-pressure accumulator volumes 44 and 46 are freely selected.
  • the clamped throttle 92 has a throttle channel 88 with diameter stage.
  • Figure 5.3 can be removed that the integrated throttle 42 is formed as a screwed throttle 96 and has a screw 98 and a threaded portion 100. Both the threaded part 100 and the screw 98 abut against a diameter stage 86 which is formed on the inner wall 94 of the high-pressure accumulator 40 with integrated manifold block.
  • the threaded portion 100 and the screw 98 each have a tool attachment 102, via which the screw 98 and the threaded portion 100 are screwed until their respective end faces abut against the diameter step 86 of the inner wall 96 of the high-pressure accumulator 40 with integrated manifold and there with defined torque against each other be screwed.
  • the screw 98 has the already mentioned throttle channel 88 with diameter stage. About the in FIG.
  • FIG. 5 illustrated embodiments of the integrated throttle 42, the in FIG. 2 High-pressure accumulators 40 with integrated distributor block 40 are likewise divided into a first high-pressure accumulator volume 44 and a second high-pressure accumulator volume 46, the second high-pressure accumulator volume 46 serving as an integrated distributor block, in which pressure pulsations in fuel under system pressure are damped.
  • the second high-pressure accumulator volume 46 which forms the integrated distributor block, is connected to the second high-pressure accumulator 20 via a connecting line with damping restrictor 26, as in FIG FIG. 2 shown in connection.

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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)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

Fuel-injection system (10) comprises a damping volume (46) integrated in a high-pressure reservoir (40) for damping pressure pulses between high-pressure reservoirs (20, 40) and between the high-pressure reservoirs and a high-pressure pump (12) : Preferred Features: The total volume of one high-pressure reservoir is divided by an integrated throttle (42) into a first high-pressure reservoir volume (44) and a second high-pressure volume serving as the damping volume.

Description

Stand der TechnikState of the art

Eine Kraftstoffeinspritzsystem für eine mehrzylindrige Verbrennungskraftmaschine mit einem ersten Hochdrucksspeicher und einem zweiten Hochdruckspeicher und mit einer Hochdruckpumpe, bei dem ein Dämpfungsvolumen zur Dämpfung von Druckpulsationen zwischen den Hochdruckspeichern und zwischen den Hochdruckspeichern und der Hochdruckpumpe in einen der Hochdruckspeicher integriert ist, ist aus EP 0 995 902 A2 bekannt.A fuel injection system for a multi-cylinder internal combustion engine having a first high-pressure accumulator and a second high-pressure accumulator and with a high-pressure pump in which a damping volume for damping pressure pulsations between the high-pressure accumulators and between the high-pressure accumulators and the high-pressure pump is integrated in one of the high-pressure accumulator is off EP 0 995 902 A2 known.

Bei dem aus WO 2004/001265 A1 bekannten Hochdruckspeicher sind hydraulische Drosseln in Form von hülsenförmigen Einsätzen in den Hochdruckspeicher integriert.At the WO 2004/001265 A1 known high pressure accumulator hydraulic throttles are integrated in the form of sleeve-shaped inserts in the high-pressure accumulator.

DE 100 60 785 A1 bezieht sich auf eine Kraftstoffeinspritzeinrichtung mit einem Kraftstoffhochdruckspeicher. An dem Kraftstoffhochdruckspeicher sind Abzweigrohre anschraubbar, die jeweils eine Drossel zum Abbau von Druckpulsationen in der Kraftstoffeinspritzeinrichtung enthalten. Die Drosseln sind jeweils als ein Rohrstück ausgebildet, das an einem Ende des Abzweigrohres, an dem ein Anschlusskopf angebracht ist, oder im Inneren des Abzweigrohrs nahe diesem Ende angeordnet sind. Drosselelemente in Hochdruckspeichern (Common Rail) dienen der Druckwellendämpfung innerhalb des Hochdruckspeicherkörpers. Dazu werden z.B. zylindrische Drosselstücke in Anschlussbohrungen des Hochdruckspeichers (Common Rail), die zu den einzelnen Kraftstoffinjektoren oder auch zu der den Hochdruckspeicher beaufschlagenden Hochdruckpumpe führen, eingepresst. Die in die Anschlussbohrungen eingepressten Drosselelemente dienen einer Verbesserung der Dämpfung von Druckschwingungen innerhalb des Kraftstoffeinspritzsystems und ermöglich dadurch eine Steigerung der Druckfestigkeit der einzelnen Komponenten. DE 100 60 785 A1 refers to a fuel injector with a high-pressure fuel storage. At the fuel high-pressure accumulator branch pipes are screwed, each containing a throttle for reducing pressure pulsations in the fuel injection device. The throttles are each formed as a pipe piece disposed at one end of the branch pipe to which a connection head is attached or inside the branch pipe near that end. Throttle elements in high-pressure accumulators (common rail) are used for pressure wave attenuation within the high-pressure accumulator body. For this purpose, for example, cylindrical throttle pieces in connection bores of the high-pressure accumulator (common rail), which lead to the individual fuel injectors or to the high-pressure accumulator acting on the high-pressure pump, pressed. The throttle elements pressed into the connection bores serve to improve the damping of pressure oscillations within the fuel injection system and thereby make it possible to increase the pressure resistance of the individual components.

Die Patentanmeldung DE 20 2004 019 820.7 bezieht sich auf eine Kraftstoffeinspritzeinrichtung für einen Dieselmotor. Eine Kraftstoffeinspritzeinrichtung umfasst einen Kraftstoffhochdruckspeicher und mehrere der Kraftstoffabfuhr aus dem Kraftstoffhochdruckspeicher dienenden Abzweigrohre. Diese weisen jeweils an ihrem einen Ende einen Anschlusskopf zur Verbindung des Abzweigrohrs mit einem zugeordneten Anschlussstutzen des Kraftstoffhochdruckspeichers auf, wobei in jedem der Abzweigrohre eine Drossel angebracht ist. Die Drossel ist in einem Trägerelement ausgebildet, welches durch Fixierelemente, die mit der Ausbildung des Anschlusskopfes herausgebildet werden und die eine lichte Weite des Abzweigrohres beiderseits des Trägerelements einengen, im Bereich des Anschlusskopfes fixiert. Die Drossel ist in dem Trägerelement als eine Durchgangsbohrung mit einer ersten Teilbohrung und einer zweiten Teilbohrung, d.h. zweistufig ausgeführt. Die Durchgangsbohrung ist während des Anstauchens des Anschlusskopfes durch einen eingefügten, gestuft zylindrischen Innendorn, der rückführbar ausgebildet ist, gesichert. Das Trägerelement weist bevorzugt eine zylindrische Mantelfläche auf.The patent application DE 20 2004 019 820.7 refers to a fuel injector for a diesel engine. A fuel injector comprises a high-pressure fuel storage and a plurality of the fuel discharge from the high-pressure fuel storage serving branch pipes. These each have at one end a connection head for connecting the branch pipe with an associated connection piece of the high-pressure fuel storage, wherein in each of the branch pipes, a throttle is mounted. The throttle is formed in a carrier element which is fixed in the region of the connection head by fixing elements which are formed with the formation of the connection head and which narrow a clear width of the branch pipe on both sides of the carrier element. The throttle is in the support member as a through hole with a first partial bore and a second partial bore, that is executed in two stages. The through hole is secured during the upsetting of the connection head by an inserted, stepped cylindrical inner mandrel, which is designed to be traceable. The carrier element preferably has a cylindrical lateral surface.

Bei Verbrennungskraftmaschinen mit sechs und mehr Zylindern werden zwei Hochdruckspeicher eingesetzt, die die Kraftstoffinjektoren der Zylinder einer Zylinderbank mit Kraftstoff versorgen. Die beiden Hochdruckspeicher (Common Rail) sind durch eine Verbindungsleitung miteinander verbunden, die für einen Druckausgleich zwischen den Hochdruckspeichern sorgt. Zur Dämpfung der Druckschwingungen, die in den beiden Hochdruckspeichern auftreten, kann zusätzlich ein Verteilerblock eingesetzt werden. Der Verteilerblock ist über eine Hochdruckpumpe beaufschlagt, welche den Kraftstoff auf den Systemdruck komprimiert und diesen Systemdruck in den beiden Hochdruckspeichern aufrechterhält. Vom durch die Hochdruckpumpe beaufschlagten Verteilerblock, in dem Schwingungen gedämpft werden, werden die beiden Hochdruckspeicher mit Kraftstoff versorgt.Internal combustion engines with six or more cylinders use two high-pressure accumulators, which supply the fuel injectors of the cylinders of a cylinder bank with fuel. The two high-pressure accumulators (Common Rail) are connected to each other by a connecting line, which ensures a pressure equalization between the high-pressure accumulators. To dampen the pressure oscillations that occur in the two high-pressure accumulators, a distributor block can additionally be used. The distributor block is acted upon by a high-pressure pump, which compresses the fuel to the system pressure and maintains this system pressure in the two high pressure accumulators. From the acted upon by the high-pressure pump manifold block in which vibrations are damped, the two high-pressure accumulator are supplied with fuel.

Offenbarung der ErfindungDisclosure of the invention

Der erfindungsgemäß vorgeschlagenen Lösung folgend, wird der bisher als separates Bauteil ausgebildete Verteilerblock in einen der beiden die mehrzylindrige Verbrennungskraftmaschine mit Kraftstoff versorgenden Hochdruckspeicher integriert. Dies wird bevorzugt dadurch realisiert, dass in den Hohlraum des betreffenden Hochdruckspeichers (Common Rail) eine Drossel integriert wird. Durch die Integration der Drossel in den z.B. als Bohrung geschaffenen Hohlraum des betreffenden Hochdruckspeichers wird das Volumen des Hochdruckspeichers in zwei Einzelvolumina geteilt. Das kleinere der beiden Einzelvolumina des betreffenden Hochdruckspeichers (Common Rail) erfüllt die Funktion des bisher als separates Bauteil gefertigten Verteilerblocks. Das den Verteilerblock darstellende kleinere Volumen des betreffenden Hochdruckspeichers liegt an dem Ende des Hochdruckspeichers, an welchem die von der Hochdruckpumpe abzweigenden, den betreffenden Hochdruckspeicher mit Kraftstoff versorgenden Hochdruckpumpen angeschlossen sind. Der andere Hochdruckspeicher wird von dem erwähnten Hochdruckspeicher, in dem der Verteilerblock integriert ist, über eine Verbindungsleitung mit Kraftstoff versorgt, deren Mündungsstelle in den weiteren Hochdruckspeicher eine Dämpfungsdrossel integriert ist.Following the solution proposed according to the invention, the distributor block, previously designed as a separate component, is integrated into one of the two high-pressure accumulators supplying fuel to the multi-cylinder internal combustion engine. This is preferably realized in that in the cavity of the respective high-pressure accumulator (common rail), a throttle is integrated. By integrating the throttle in the e.g. As a cavity created cavity of the respective high-pressure accumulator, the volume of the high-pressure accumulator is divided into two individual volumes. The smaller of the two individual volumes of the relevant high-pressure accumulator (common rail) fulfills the function of the distribution block, which was previously manufactured as a separate component. The distributor block representing smaller volume of the respective high-pressure accumulator is located at the end of the high-pressure accumulator to which the branching from the high-pressure pump, the respective high-pressure accumulator fuel-supplying high pressure pumps are connected. The other high-pressure accumulator is supplied from the mentioned high-pressure accumulator, in which the distributor block is integrated, via a connecting line with fuel whose outlet point is integrated in the further high-pressure accumulator, a damping throttle.

Durch die erfindungsgemäß vorgeschlagene Lösung der Integration des bisher als separates Bauteil gefertigten Verteilerblocks in einen der Hochdruckspeicher wird einerseits der Einsatz eines Bauraum beanspruchenden separaten Bauteils zwischen den beiden Hochdruckspeichern vermieden, so dass der Einbauraum des erfindungsgemäß vorgeschlagenen Kraftstoffeinspritzsystems im Zylinderkopfbereich einer mehrzylindrigen Verbrennungskraftmaschine geringer ausfällt. Ferner wird aufgrund der Vermeidung eines separaten druckfest auszulegenden Bauteils ein nicht unerheblicher Kostenvorteil erzielt. Wie erfindungsgemäß vorgeschlagen, dämpft der in einen der Hochdruckspeicher integrierte Verteilerblock ebenfalls Druckschwingungen, die im Kraftstoffeinspritzsystem auftreten können und ist daher hinsichtlich seiner Funktion einem bisher als separates Bauteil gefertigten Verteilerblocks gleichwertig.By inventively proposed solution of the integration of the previously manufactured as a separate component manifold block in one of the high-pressure accumulator on the one hand, the use of a space-consuming separate component between the two high-pressure accumulators avoided, so that the installation space of the inventively proposed fuel injection system in the cylinder head area of a multi-cylinder internal combustion engine fails. Furthermore, a considerable cost advantage is achieved due to the avoidance of a separate flameproof component to be designed. As proposed by the invention, the distribution block integrated in one of the high-pressure accumulators likewise dampens Pressure oscillations that can occur in the fuel injection system and is therefore equivalent in function to a previously manufactured as a separate component manifold block.

Zur Realisation der integrierten Drossel und der dadurch herbeigeführten Unterteilung des Hochdruckspeichervolumens in zwei Einzelvolumina stehen mehrere Ausführungsvarianten zur Verfugung:

  • Die integrierte Drossel kann z.B. als eine Bohrung in einem Durchmessersteg des Hochdruckspeichers (Common Rail) ausgeführt werden. Gemäß dieser Ausführungsvariante wird der Hohlraum durch eine an beiden Seiten des rohrförmigen Hochdruckspeichers eingebrachte Tieflochbohrung begrenzt. In dem die beiden Tieflochbohrungsabschnitte trennenden Steg kann dann eine einen gestuften Drosselkanal aufweisende integrierte Drossel eingebracht werden. In Weiterbildung dieser Ausführungsvariante können die einander zuweisenden Endbereiche der beidseits in den Hochdruckspeicher eingebrachten Tieflochbohrungen auch verrundet werden, um die Strömungseigenschaften des Kraftstoffs innerhalb des Hohlraums des Hochdruckspeichers zu verbessern. In einer weiteren Ausführungsvariante kann in einem durchgängigen Hohlraum , der z.B. als Durchgangsbohrung im Hochdruckspeicherkörper ausgebildet sein kann, ein hülsenförmiges Bauteil eingelassen werden, der an einem Ende, bevorzugt dem dem Mittelbereich des Hochdruckspeichers zuweisenden Ende in einer Bodenfläche eine Drosselöffnung aufweist. Dieser hülsenförmige Einsatz kann durch ein Anschlussstück, an dem die Druckleitung von der Hochdruckpumpe angeschlossen wird, im Hohlraum des Hochdruckspeichers fixiert werden. In Weiterbildung dieser Ausführungsvariante können der von der Hochdruckpumpe beaufschlagte Anschluss und die in den Hohlraum des Hochdruckspeichers eingelassene Hülse mit Drosselbohrung am Ende auch als Einbauteil gefertigt werden, was z.B. mittels einer Beißkante an einer Stirnseite des Hochdruckspeichers in diesem befestigt werden kann.
To implement the integrated throttle and the resulting division of the high-pressure storage volume into two individual volumes, several variants are available:
  • The integrated throttle can be performed, for example, as a bore in a diameter bar of the high-pressure accumulator (common rail). According to this embodiment variant, the cavity is delimited by a deep hole bore introduced on both sides of the tubular high-pressure reservoir. In which the two deep hole drilling sections separating web can then be introduced a stepped throttle channel having integrated throttle. In a further development of this embodiment variant, the mutually facing end regions of the deep hole bores introduced into the high-pressure accumulator on both sides can also be rounded in order to improve the flow properties of the fuel within the hollow space of the high-pressure accumulator. In a further embodiment, a sleeve-shaped component can be embedded in a continuous cavity, which can be formed, for example, as a through-bore in the high-pressure reservoir body, which has a throttle opening at one end, preferably the end facing the middle region of the high-pressure accumulator. This sleeve-shaped insert can be fixed in the cavity of the high-pressure accumulator through a connecting piece to which the pressure line is connected by the high-pressure pump. In a further development of this embodiment, the acted upon by the high-pressure pump port and the recessed into the cavity of the high-pressure accumulator sleeve with throttle bore at the end can be made as a built-in part, which can be attached by means of a biting edge on an end face of the high-pressure accumulator in this example.

In einer weiteren Ausführungsvariante der erfindungsgemäß vorgeschlagenen integrierten Drossel, kann diese auch als Einpressdrossel ein Ringelement und einen Drosselkörper umfassend in den Hohlraum des Hochdruckspeichers integriert werden. Gemäß dieser Ausführungsvariante kann die integrierte Drossel sowohl als einteiliges Bauelement als auch als mehrteiliges Bauelement einen Ringkörper und einen Drosselkörper umfassend ausgebildet sein. Anstelle einer Einpressdrossel, die in den Hohlraum des Hochdruckspeichers eingepresst wird, kann die integrierte Drossel auch als eine eingespannte Drossel ausgebildet werden, die mittels eines Ringspannelements im Hohlraum des betreffenden Hochdruckspeichers (Common Rail) fixiert ist. Gemäß dieser Ausführungsvariante kann die Position der integrierten Drossel innerhalb des Hohlraum des Hochdruckspeichers beliebig gewählt werden, so dass auch die beiden Einzelvolumina innerhalb des Hochdruckspeichers frei wählbar und frei vorgebbar sind.In a further embodiment variant of the inventively proposed integrated throttle, this can also be integrated as Einpressdrossel a ring member and a throttle body in the cavity of the high-pressure accumulator. According to this embodiment variant, the integrated throttle can be designed to comprise both a one-piece component and a multi-part component comprising an annular body and a throttle body. Instead of a Einpressdrossel which is pressed into the cavity of the high-pressure accumulator, the integrated throttle can also be designed as a clamped throttle, which is fixed by means of a ring tensioning element in the cavity of the respective high-pressure accumulator (common rail). According to this embodiment, the position of the integrated throttle within the cavity of the high-pressure accumulator can be chosen arbitrarily, so that the two individual volumes within the high-pressure accumulator are freely selectable and freely definable.

In einer weiteren Ausführungsvariante kann die integrierte Drossel als zweiteiliges Bauelement einen Schraubteil und einen Gewindeteil umfassend ausgebildet sein, wobei sich sowohl der Gewindeteil als auch der Schraubteil an einer Durchmesserstufe an der Innenwandung des Hohlraums des Hochdruckspeichers abstützen und gegeneinander verschraubt werden. Durch die Verschraubung wird die integrierte Drossel im Hohlraum des betreffenden Hochdruckspeichers (Common Rail) integriert.In a further embodiment variant, the integrated throttle as a two-part component can be designed to comprise a screw part and a threaded part, wherein both the threaded part and the screw part are supported on a diameter step on the inner wall of the cavity of the high-pressure accumulator and are screwed against one another. The screw connection integrates the integrated throttle in the cavity of the relevant high-pressure accumulator (common rail).

Zeichnungdrawing

Anhand der Zeichnung wird die Erfindung nachstehend eingehender beschrieben.With reference to the drawing, the invention will be described below in more detail.

Es zeigt:

Figur 1
ein Kraftstoffeinspritzsystem gemäß des Standes der Technik mit einem Vertei- lerblock, der als separates Bauteil gefertigt ist,
Figur 2
das erfindungsgemäß vorgeschlagene Kraftstoffeinspritzsystem, bei welchem der Verteilerblock in einen der Hochdruckspeicher (Common Rail) integriert ist,
Figur 3.1
eine als Durchgangsbohrung im Hochdruckspeicher ausgebildete integrierte Drossel,
Figur 3.2
eine Ausführungsvariante der in Figur 3.1 dargestellten integrierten Drossel, wobei die Stirnseiten von Abschnitten einer Tieflochbohrung im Hochdruck- speicher verrundet ausgebildet sind,
Figur 4.1
eine Ausführungsvariante der integrierten Drossel, die in einem hülsenförmigen Körper ausgebildet ist, der in den Hohlraum des Hochdruckspeichers einge- schoben wird,
Figur 4.2
eine Ausführungsvariante, wonach die integrierte Drossel in einem einstückigen Bauteil, einem hülsenformigen Abschnitt und einen Anschlussteil umfassend ausgeführt ist,
Figur 5
eine Ausführungsvariante der integrierten Drossel, die als Einpressdrossel be- schaffen ist,
Figur 5.1
eine einstückig ausgebildete integrierte Drossel als Einpressdrosselelement,
Figur 5.2
eine mittels eines Ringspannelements in den Hohlraum des Hochdruckspeichers integrierte Drossel und
Figur 5.3
eine zweiteilig ausgebildete integrierte Drossel, einen Gewindeteil und einen Schraubenteil umfassend.
It shows:
FIG. 1
a fuel injection system according to the prior art with a distribution block, which is manufactured as a separate component,
FIG. 2
the fuel injection system proposed according to the invention, in which the distributor block is integrated in one of the high-pressure accumulators (common rail),
Figure 3.1
a built-in through hole in the high-pressure accumulator integrated throttle,
Figure 3.2
a variant of the in Figure 3.1 illustrated integrated throttle, wherein the end faces of sections of a deep hole in the high-pressure memory are rounded rounded,
Figure 4.1
A variant of the integrated throttle, which is formed in a sleeve-shaped body, which is inserted into the cavity of the high-pressure accumulator,
Figure 4.2
a variant embodiment, according to which the integrated throttle is embodied in a one-piece component, a sleeve-shaped section and a connection part comprising
FIG. 5
a variant of the integrated throttle, which is to be described as a press-fit throttle,
Figure 5.1
an integrally formed integrated throttle as Einpressdrosselelement,
Figure 5.2
a built-in by means of a ring tensioning element in the cavity of the high-pressure accumulator throttle and
Figure 5.3
comprising a two-part integrated throttle, a threaded part and a screw part.

Ausführungsvariantenvariants

Der Darstellung gemäß Figur 1 ist ein aus dem Stand der Technik bekanntes Kraftstoffeinspritzsystem für mehrzylindrige Verbrennungskraftmaschinen zu entnehmen, bei dem der Verteilerblock als separates Bauteil ausgeführt ist.The representation according to FIG. 1 is to be taken from a known from the prior art fuel injection system for multi-cylinder internal combustion engines, wherein the manifold block is designed as a separate component.

Der Darstellung gemäß Figur 1 ist entnehmbar, dass ein Kraftstoffeinspritzsystem 10 eine Hochdruckpumpe 12 umfasst, die einen als separates Bauteil ausgebildeten Verteilerblock 14 mit Kraftstoff beaufschlagt. Die Leitungen, die sich von der Hochdruckpumpe 12 zum Verteilerblock 14 erstrecken, weisen jeweils Verteilerblockdrosseln 16 auf, über welche eine Dämpfung der Druckpulsationen im Kraftstoffeinspritzsystem 10 erfolgt. Über den Verteilerblock 14 werden ein erster Hochdruckspeicher 18 (Common Rail) sowie ein zweiter Hockdruckspeicher 20 (Common Rail) mit unter Systemdruck stehendem Kraftstoff versorgt. Der Systemdruck, der im ersten Hochdruckspeicher 18 und dem zweiten Hochdruckspeicher 20 herrscht, hängt von der Auslegung der Hochdruckpumpe 12 ab. Dem ersten Hochdruckspeicher 18 ist ein Raildrucksensor 22 zugeordnet, dem zweiten Hochdruckspeicher 20 ein Druckregelventil 24. Der erste Hochdruckspeicher 18 wird vom Verteilerblock 14 über eine Druckleitung beaufschlagt, an deren Ende eine Dämpferdrossel 26 eingangs des ersten Hochdruckspeichers 18 ausgeführt ist.The representation according to FIG. 1 It can be seen that a fuel injection system 10 includes a high-pressure pump 12, which acts on a designed as a separate component manifold block 14 with fuel. The lines extending from the high-pressure pump 12 to the manifold block 14 each have manifold block throttles 16, via which an attenuation of the pressure pulsations in the fuel injection system 10 takes place. Via the distributor block 14, a first high-pressure accumulator 18 (common rail) and a second high-pressure accumulator 20 (common rail) are supplied with fuel under system pressure. The system pressure prevailing in the first high-pressure accumulator 18 and the second high-pressure accumulator 20 depends on the design of the high-pressure pump 12. The first high-pressure accumulator 18 is a rail pressure sensor 22 associated with the second high pressure accumulator 20, a pressure control valve 24. The first high-pressure accumulator 18 is acted upon by the manifold block 14 via a pressure line, at the end of a damper throttle 26 is designed at the entrance of the first high-pressure accumulator 18.

Jeder der beiden Hochdruckspeicher 18 bzw. 20 umfasst vier Injektorzuleitungen 28, in denen jeweils eine Zuleitungsdrossel 30 integriert sein kann, um Druckpulsationen zwischen den in Figur 1 nicht dargestellten Kraftstoffinjektoren und den jeweiligen Hochdruckspeichern 18 bzw. 20 zu dämpfen. In der in Figur 1 dargestellten Ausführungsvariante des Kraftstoffeinspritzsystems 10 werden über die beiden Hochdruckspeicher 18 bzw. 20 jeweils vier Kraftstoffinjektoren mit unter Systemdruck stehendem Kraftstoff versorgt, die die jeweiligen Zylinder zweier Zylinderbänke einer mehrzylindrigen Verbrennungskraftmaschine zugeordnet sind.Each of the two high-pressure accumulators 18 and 20 comprises four injector supply lines 28, in each of which a supply line throttle 30 can be integrated to pressure pulsations between the in FIG. 1 Not shown fuel injectors and the respective high-pressure accumulators 18 and 20 to attenuate. In the in FIG. 1 illustrated embodiment of the fuel injection system 10 are supplied via the two high-pressure accumulator 18 and 20 respectively four fuel injectors with fuel under system pressure standing, which are associated with the respective cylinder two cylinder banks of a multi-cylinder internal combustion engine.

Der Darstellung gemäß Figur 2 ist das erfindungsgemäß vorgeschlagene Kraftstoffeinspritzsystem 10 zu entnehmen.The representation according to FIG. 2 the fuel injection system 10 proposed according to the invention can be seen.

Aus der Darstellung gemäß Figur 2 geht hervor, dass das Kraftstoffeinspritzsystem 10 einen Hochdruckspeicher 40 mit integriertem Verteilerblock aufweist. Dazu ist der Hochdruckspeicher 40 mit integriertem Verteilerblock im Vergleich zum zweiten Hochdruckspeicher 20 verlängert ausgeführt. Beide Hochdruckspeicher 20 bzw. 40 sind im Wesentlichen rohrförmig ausgeführt. Dem Hochdruckspeicher 40 mit integriertem Verteilerblock ist der Raildrucksensor 22 zugeordnet, dem zweiten Hochdruckspeicher 20 das Druckregelventil 24. Den Hochdruckspeichern 20, 40 sind jeweils vier Injektorzuleitungen 28 zugeordnet, in denen jeweils eine Zuleitungsdrossel 30 aufgenommen ist. Mit dem in Figur 2 dargestellten Kraftstoffeinspritzsystem 10 können demnach die Zylinder zweier Zylinderbänke einer 8-zylindrigen Verbrennungskraftmaschine mit unter Systemdruck stehendem Kraftstoff versorgt werden. Das Kraftstoffeinspritzsystem 10 gemäß der Darstellung in Figur 2 kann selbstverständlich auch derart modifiziert werden, dass ein in V-Form ausgelegter Sechszylindermotor damit ausgerüstet werden kann, anstelle der in Figur 2 dargestellten Ausführungsvariante des Kraftstoffeinspritzsystems 10 für 8-zylindrige Verbrennungskraftmaschinen, können auch Verbrennungskraftmaschinen mit dem erfindungsgemäß vorgeschlagenen Kraftstoffeinspritzsystem ausgerüstet werden, die eine noch höhere Zylinderzahl aufweisen.From the illustration according to FIG. 2 It can be seen that the fuel injection system 10 has a high-pressure accumulator 40 with integrated manifold block. For this purpose, the high-pressure accumulator 40 is designed to be longer with integrated manifold block compared to the second high-pressure accumulator 20. Both high-pressure accumulator 20 and 40 are designed substantially tubular. The high-pressure accumulator 40 with integrated manifold block is the rail pressure sensor 22 associated with the second high-pressure accumulator 20, the pressure control valve 24. The high-pressure accumulators 20, 40 are each assigned four Injektorzuleitungen 28, in each of which a supply line throttle 30 is received. With the in FIG. 2 Accordingly, the fuel injection system 10 shown, the cylinders of two cylinder banks of an 8-cylinder internal combustion engine can be supplied with system under pressure fuel. The fuel injection system 10 as shown in FIG FIG. 2 can of course also be modified so that a designed in V-shape six-cylinder engine can be equipped with it, instead of in FIG. 2 illustrated embodiment of the fuel injection system 10 for 8-cylinder internal combustion engines, internal combustion engines can be equipped with the present invention proposed fuel injection system, which have an even higher number of cylinders.

Im Unterschied zum ersten Hochdruckspeicher 18 gemäß der Darstellung in Figur 1 weist der Hochdruckspeicher 40 mit integriertem Verteilerblock eine integrierte Drossel 42 auf, so dass dessen Gesamtvolumen in ein erstes Hochdruckspeichervolumen 44 und ein zweites Hochdruckspeichervolumen 46 unterteilt wird. Das erste Hochdruckspeichervolumen 44 ist größer bemessen als das zweite Hochdruckspeichervolumen 46, welches als integrierter Verteilerblock innerhalb der Hochdruckspeichers 40 dient. Das zweite Hochdruckspeichervolumen 46, d.h. der in den Hochdruckspeicher 40 integrierte Verteilerblock liegt bevorzugt an dem Ende, an welchem der Hochdruckspeicher 40 mit integriertem Verteilerblock über Druckleitungen 48 von der Hochdruckpumpe 12 her mit unter Hochdruck stehendem Kraftstoff beaufschlagt wird. In jeder der Zuleitungen 48 zwischen der Hochdruckpumpe 12 und dem zweiten Hochdruckspeichervolumen 46 befinden sich Druckleitungsdrosseln 50, 52, die Druckpulsationen zwischen dem Hochdruckspeicher 40 mit integriertem Verteilerblock und der Hochdruckpumpe 12 dämpfen.In contrast to the first high pressure accumulator 18 as shown in FIG FIG. 1 For example, the high-pressure accumulator 40 with integrated manifold block has an integrated throttle 42 so that its total volume is divided into a first high-pressure accumulator volume 44 and a second high-pressure accumulator volume 46. The first high-pressure accumulator volume 44 is dimensioned larger than the second high-pressure accumulator volume 46, which serves as an integrated distributor block within the high-pressure accumulator 40. The second high-pressure accumulator volume 46, ie the distributor block integrated in the high-pressure accumulator 40, is preferably located at the end at which the high-pressure accumulator 40 with integrated manifold block is acted upon by high-pressure fuel via pressure lines 48 from the high-pressure pump 12. In each of the supply lines 48 between the high-pressure pump 12 and the second high-pressure accumulator volume 46 are pressure line throttles 50, 52, the pressure pulsations between the high-pressure accumulator 40 with integrated manifold block and the high-pressure pump 12 attenuate.

Das zweite Hochdruckspeichervolumen 46 im Hochdruckspeicher 40 mit integriertem Verteilerblock steht über eine Verbindungsleitung, die eine Dämpfungsdrossel 26 enthält, mit dem zweiten Hochdruckspeicher 20 in Verbindung. Der zweite Hochdruckspeicher 20 ist ebenso aufgebaut wie der in Figur 1 dargestellte zweite Hochdruckspeicher 20.The second high-pressure accumulator volume 46 in the high-pressure accumulator 40 with integrated distributor block is connected to the second high-pressure accumulator 20 via a connecting line, which contains an attenuation restrictor 26. The second high-pressure accumulator 20 is constructed as well as in FIG. 1 illustrated second high-pressure accumulator 20th

Durch das in Figur 2 dargestellte erfindungsgemäße Kraftstoffeinspritzsystem 10 wird der in Figur 1 als separates Bauteil dargestellte Verteilerblock 14 eingespart, so dass sich im Zylinderkopfbereich einer mehrzylindrigen Verbrennungskraftmaschine mit zwei Zylinderbänken ein geringerer Platzbedarf für das erfindungsgemäß vorgeschlagene Kraftstoffeinspritzsystem 10 ergibt.Through the in FIG. 2 represented fuel injection system 10 according to the invention is in FIG. 1 as a separate component shown distributor block 14 saved, so that in the cylinder head area of a multi-cylinder internal combustion engine with two cylinder banks a smaller footprint for the inventively proposed fuel injection system 10 results.

Figur 3.1 ist eine als Durchgangsbohrung beschaffene Ausführungsvariante der integrierten Drossel zu entnehmen. Figure 3.1 is a procured as a through hole embodiment variant of the integrated throttle refer.

Figur 3.1 zeigt, dass der Hochdruckspeicher 40 mit integriertem Verteilerblock einen Hohlraum 54 aufweist. Der Hohlraum 54 wird durch jeweils einen Abschnitt einer beidseits in den Hochdruckspeicher 40 mit integriertem Verteilerblock eingebrachten Tieflochbohrung 56 bestimmt. Innerhalb der verbleibenden Steges im Hohlraum 54 des Hochdruckspeichers 40 mit integriertem Verteilerblock wird eine als Durchgangsbohrung 62 ausführbare integrierte Drossel 42 ausgeführt. Das zweite Hochdruckspeichervolumen 46 innerhalb des Hohlraums 54 gebildet durch einen Abschnitt der Tieflochbohrung 56 wird einerseits durch die integrierte Drossel 42 und andererseits durch einen Anschluss 64, an welchem die Hochdruckpumpe 12 angeschlossen wird, begrenzt. Im Anschluss 64 für die Hochdruckpumpe 12 kann eine integrierte Dämpferdrossel 66 ausgebildet sein. Mit Bezugszeichen 60 ist in der in Figur 3.1 dargestellten Ausführungsvariante der Anschluss der Injektorzuleitung 28 bezeichnet, wobei in der Wand 68 des Hochdruckspeichers 40 mit integriertem Verteilerblock Einpressdrosseln 58 eingelassen sind. Mittels der Einpressdrossel 48 werden Druckpulsationen zwischen den in Figur 3.1 nicht dargestellten Kraftstoffinjektoren und dem Hohlraum 54 des Hochdruckspeichers 40 mit integriertem Verteilerblock gedämpft. Figure 3.1 shows that the high pressure accumulator 40 with integrated manifold block has a cavity 54. The cavity 54 is determined by a respective portion of a deep hole bore 56 introduced on both sides into the high-pressure accumulator 40 with an integrated distributor block. Within the remaining bridge in the cavity 54 of the high-pressure accumulator 40 with an integrated distributor block, an integrated throttle 42 which can be embodied as a through-bore 62 is executed. The second high-pressure storage volume 46 within the cavity 54 formed by a portion of the deep hole bore 56 is limited on the one hand by the integrated throttle 42 and on the other hand by a port 64 to which the high pressure pump 12 is connected. In connection 64 for the high-pressure pump 12, an integrated damper throttle 66 may be formed. Reference numeral 60 in the in Figure 3.1 illustrated embodiment of the connection of the injector supply line 28, wherein in the wall 68 of the high-pressure accumulator 40 with integrated manifold block Einpressdrosseln 58 are embedded. By means of the injection throttle 48, pressure pulsations between the in Figure 3.1 Not shown fuel injectors and the cavity 54 of the high-pressure accumulator 40 with integrated manifold block damped.

Die Darstellung gemäß Figur 3.2 zeigt eine Ausführungsvariante der in Figur 3.1 dargestellten integrierten Drossel. Gemäß der Darstellung in Figur 3.2 ist die integrierte Drossel 42 ebenfalls als durchgebohrte Drossel 62 mit einem gestuften Drosselkanal ausgeführt, jedoch sind die einander zuweisenden Stirnseiten der beiden Bohrungsabschnitte der Tieflochbohrung 56 im Hochdruckspeicher 40 mit integriertem Verteilerblock jeweils mit einer Verrundung 70 versehen. Dies begünstigt die Festigkeitseigenschaften des Hochdruck-speichers 40 mit integriertem Verteilerblock, da Kerbwirkung vermieden wird. Der Hohlraum 54 bzw. das zweite Hochdruckspeichervolumen 46 werden unmittelbar über die am Anschluss 64 über die Druckleitung 48 wirkende Hochdruckpumpe 12 mit unter hohem Druck stehenden Kraftstoff versorgt. Auch in der in Figur 3.2 dargestellten Ausfüh-rungsvariante des erfindungsgemäß vorgeschlagenen Kraftstoffeinspritzsystems 10 sind in die Wand 68 des Hochdruckspeichers 40 mit integriertem Verteilerblock Einpressdrosseln 58 eingelassen, welche Druckpulsationen zwischen dem Hohlraum 54 und den an den Anschlüssen 60 angeschlossenen Injektorzuleitungen 28 zu den Kraftstoff-injektoren der mehrzylindrigen Verbrennungskraftmaschine dämpfen. Durch die Verrundungen 70 wird eine gleichmäßigere Strömungsausbildung durch die als durchgebohrten Drosselkanal 62 beschaffene integrierte Drossel 42, welche das zweite Hochdruckspeichervolumen 46 vom ersten Hochdruckspeichervolumen 44 innerhalb des Hohlraums 54 trennt, geschaffen.The representation according to Figure 3.2 shows a variant of the in Figure 3.1 illustrated integrated throttle. As shown in Figure 3.2 the integrated throttle 42 is also designed as a through-drilled throttle 62 with a stepped throttle channel, but the facing end sides of the two bore portions of the deep hole bore 56 are provided in the high-pressure accumulator 40 with integrated manifold block each with a rounding 70. This favors the strength properties of the high-pressure accumulator 40 with integrated distributor block, since notch effect is avoided. The cavity 54 and the second high-pressure accumulator volume 46 are supplied directly via the pressure acting on the port 64 via the pressure line 48 high-pressure pump 12 with high pressure fuel. Also in the in Figure 3.2 illustrated embodiment of the present invention proposed fuel injection system 10 are embedded in the wall 68 of the high-pressure accumulator 40 with integrated manifold Einpressdrosseln 58, which pressure pulsations between the cavity 54 and connected to the terminals 60 Injektorzuleitungen 28 to the fuel injectors of mehrzylindrigen Steam internal combustion engine. The fillets 70 provide more uniform flow formation through the integrated throttle 42, which is drilled through as a drilled passage 62 and separates the second high pressure storage volume 46 from the first high pressure storage volume 44 within the cavity 54.

In der Darstellung gemäß 4.1 ist eine weitere Ausführungsvariante der integrierten Drossel dargestellt, die in einem hülsenförmigen Bauteil befindet, welches in den Hohlraum des Hochdruckspeichers mit integriertem Verteilerblock eingelassen ist.In the illustration according to 4.1, a further embodiment of the integrated throttle is shown, which is located in a sleeve-shaped component, which is embedded in the cavity of the high-pressure accumulator with integrated manifold block.

Aus Figur 4.1 geht hervor, dass der Hohlraum 54 des Hochdruckspeichers 40 mit integriertem Verteilerblock durch eine Hülse 72, die eine Bodenfläche mit Drosselbohrung aufweist in das erste Hochdruckspeichervolumen 44 und das zweite Hochdruckspeichervolumen 46 unterteilt ist. Die Hülse 72 umfasst eine Bodenfläche, in der die integrierte Drossel 42 als einfach herstellbare Bohrung ausgeführt ist. Die Hülse 72 wird über den Anschluss 64 für die Druckleitung 48 der Hochdruckpumpe 64 im Hohlraum 54 des Hochdruckspeichers 40 mit integriertem Verteilerblock fixiert. Dazu weist der Anschluss 64 für die Druckleitung 48 der Hochdruckpumpe 12 eine Beißkante 64 auf, welche im Bohrungsdurchmesser 46 im Anschlussbereich kraftschlüssig oder Formschlüssig fixiert wird und auf die in den Hohlraum 54 eingelassene Hülse 72 mit integrierter Drossel 42 einwirkt. In der Wand 68 des Hochdruckspeichers 40 mit integriertem Verteilerblock befinden sich die bereits erwähnten Einpressdrosseln 48 unterhalb der Anschlüsse 60, an welchen die Injektorzuleitungen 28 zu den mit unter Systemdruck stehendem Kraftstoff zu versorgenden Kraftstoffinjektoren angeschlossen sind.Out Figure 4.1 It is apparent that the cavity 54 of the manifold-integrated high-pressure accumulator 40 is divided into the first high-pressure accumulator volume 44 and the second high-pressure accumulator volume 46 by a sleeve 72 having a throttle-bottomed bottom surface. The sleeve 72 includes a bottom surface in which the integrated throttle 42 is designed as a simple manufacturable bore. The sleeve 72 is fixed via the connection 64 for the pressure line 48 of the high pressure pump 64 in the cavity 54 of the high pressure accumulator 40 with integrated manifold block. For this purpose, the connection 64 for the pressure line 48 of the high-pressure pump 12 has a biting edge 64 which is fixed positively or positively in the bore diameter 46 and acts on the sleeve 72 with integrated throttle 42 inserted into the cavity 54. In the wall 68 of the high-pressure accumulator 40 with an integrated distributor block are the already mentioned Einpressdrosseln 48 below the terminals 60, to which the Injektorzuleitungen 28 are connected to the standing under system pressure fuel injectors.

Figur 4.2 zeigt eine Ausführungsvariante der in Figur 4.1 dargestellten Konfiguration. Figure 4.2 shows a variant of the in Figure 4.1 illustrated configuration.

Aus der Darstellung gemäß Figur 4.2 geht hervor, dass die in Figur 4.1 gezeigten Bauteile, nämlich die Hülse 72 und der Anschluss 64 für die Druckzuleitung 48 der Hochdruckpumpe als ein gemeinsames Einsatzstück 78 einteilig ausführbar sind. Das Einsatzstück 78 umfasst den Anschluss für die zur Druckleitung 48 der Hochdruckpumpe 12 sowie die Hülse. An dem dem Hohlraum 54 zuweisenden Ende weist das einteilige Einsatzstück 78 eine Bodenfläche auf, in der die integrierte Drossel 42 ebenfalls als einfache Bohrung ausgebildet ist. Durch das Einsatzstück 78 werden im Hohlraum 54 des Hochdruckspeichers 40 mit integriertem Verteilerblock das erste Hochdruckspeichervolumen 44 und das, zweite Hochdruckspeichervolumen 46 dargestellt. Im Unterschied zur in Figur 4.1 dargestellten Ausfiihrungsvariante sind in der Wand 68 des Hochdruckspeichers 40 mit integriertem Verteilerblock keine Einpressdrosseln 58 ausgebildet, die Dämpferdrosseln 30 sind als einfache Bohrungen in der Wand 68 des Hochdruckspeichers 40 mit integriertem Verteilerblock realisiert und befinden sich unterhalb der Anschlüsse 60 für die Injektorzuleitungen 38.From the illustration according to Figure 4.2 shows that the in F igur 4.1 shown components, namely the sleeve 72 and the port 64 for the pressure supply line 48 of the high-pressure pump as a common insert 78 are integrally executable. The insert 78 includes the connection for the pressure line 48 of the high pressure pump 12 and the sleeve. At the end facing the cavity 54, the one-piece insert 78 has a bottom surface, in which the integrated throttle 42 is also formed as a simple bore. Through the insert 78, the first high-pressure accumulator volume 44 and the second high-pressure accumulator volume 46 are shown in the cavity 54 of the high-pressure accumulator 40 with integrated manifold block. Unlike in Figure 4.1 In the embodiment shown in the wall 68 of the high-pressure accumulator 40 with integrated distributor block no injection throttles 58 are formed, the damper throttles 30 are realized as simple bores in the wall 68 of the high-pressure accumulator 40 with integrated distributor block and are located below the connections 60 for the injector supply lines 38.

Figur 5 ist eine Ausführungsvariante für eine integrierte Drossel zu entnehmen, die als Einpressdrossel ausgebildet ist. FIG. 5 is to take a variant for an integrated throttle, which is designed as Einpressdrossel.

Im Hochdruckspeicher 40 mit integriertem Verteilerblock trennt die als eingepresste Drossel 80 ausgeführte integrierte Drossel 42 das zweite Hochdruckspeichervolumen 46 vom ersten Hochdruckspeichervolumen 44. Durch den Einpressort, d.h. die axiale Länge des Hohlraums 54, an dem die als eingepresste Drossel 80 ausgebildete integrierte Drossel 42 fixiert ist, kann die Größe des ersten Hochdruckspeichervolumens 44 und die Größe des zweiten Hochdruckspeichervolumens 46 im Hohlraum 54 des Hochdruckspeichers 40 mit integriertem Verteilerblock exakt vorgegeben werden. In der in Figur 5 dargestellten Ausführungsvariante der eingepressten Drossel 80 weist diese einen Ringkörper 82 sowie einen Drosselkörper 84 auf. Der Ringkörper 82 liegt an einer Innenwand, die den Hohlraum 54 des Hochdruckspeichers 40 mit integriertem Verteilerblock begrenzt, an. In der Wand 68 des Hochdruckspeichers 40 mit integriertem Verteilerblock sind die Dämpferdrosseln 30 wieder als einfache Bohrungen ausgeführt, die senkrecht zum Hohlraum 54 unterhalb der Anschlüsse 60 für die Injektorzuleitungen 28 verlaufen.In the high-pressure accumulator 40 with integrated manifold block designed as a pressed throttle 80 integrated throttle 42 separates the second high-pressure accumulator volume 46 from the first high-pressure accumulator volume 44th By the Einpressort, ie the axial length of the cavity 54 to which the impressed as a throttle 80 designed integrated throttle 42 is fixed , the size of the first high-pressure accumulator volume 44 and the size of the second high-pressure accumulator volume 46 in the cavity 54 of the high-pressure accumulator 40 with integrated manifold block can be exactly specified. In the in FIG. 5 illustrated embodiment of the pressed throttle 80, this has a ring body 82 and a throttle body 84. The annular body 82 is located on an inner wall which bounds the cavity 54 of the high-pressure accumulator 40 with an integrated distributor block. In the wall 68 of the high-pressure accumulator 40 with integrated manifold block, the damper throttles 30 are again designed as simple bores which run perpendicular to the cavity 54 below the connections 60 for the injector supply lines 28.

Figur 5.1 zeigt eine Ausführungsvariante einer als Einpressdrossel ausgebildeten integrierten Drossel gemäß Figur 5. Figure 5.1 shows a variant of a designed as Einpresshrrossel integrated throttle according to FIG. 5 ,

Aus der Darstellung gemäß Figur 5.1 geht hervor, dass an einer Innenwand 94 des Hochdruckspeichers 40 mit integriertem Verteilerblock eine Durchmesserstufe 86 ausgebildet ist, an welcher sich ein Bund des Drosselkörpers 84 abstützt. Der Drosselkörper 84 ist von einem Drosselkanal 88 mit einer Durchmesserstufe durchzogen und trennt das erste Hochdruckspeichervolumen 44 vom zweiten Hochdruckspeichervolumen 46. Der Bund, der am Drosselkörper 84 ausgebildet ist, weist dem zweiten Hochdruckspeichervolumen 46 innerhalb des Hohlraums 54 des Hochdruckspeichers 40 mit integriertem Verteilerblock zu.From the illustration according to Figure 5.1 shows that on an inner wall 94 of the high-pressure accumulator 40 with an integrated distributor block, a diameter step 86 is formed, on which a collar of the throttle body 84 is supported. The throttle body 84 is crossed by a throttle passage 88 having a diameter step and separates the first high-pressure accumulator 44 from the second high-pressure accumulator 46. The collar formed on the throttle body 84, the second high-pressure accumulator volume 46 within the cavity 54 of the high-pressure accumulator 40 with integrated manifold block.

Figur 5.2 zeigt eine Ausführungsvariante der integrierten Drossel, die mittels eines Ringspannelements im Hochdruckspeicher mit integriertem Verteilerblock fixierbar ist. Figure 5.2 shows a variant of the integrated throttle, which is fixable by means of a ring tensioning element in the high-pressure accumulator with integrated manifold block.

Aus der Darstellung gemäß Figur 5.2 geht hervor, dass eine eingespannte Drossel 92 über ein Ringspannelement 90 an der Wand 68 an der Innenwand 94 des Hochdruckspeichers 40 mit integriertem Verteilerblock fixiert ist. Gemäß der in Figur 5.2 dargestellten Ausführungsvariante kann der Einbauort der integrierten Drossel 42 im Hochdruckspeicher 40 mit integriertem Verteilerblock entsprechend der Aufteilung der Hochdruckspeichervolumina 44 und 46 frei gewählt werden. Auch die eingespannte Drossel 92 weist einen Drosselkanal 88 mit Durchmesserstufe auf.From the illustration according to Figure 5.2 shows that a clamped throttle 92 is fixed via a ring clamping element 90 to the wall 68 on the inner wall 94 of the high pressure accumulator 40 with integrated manifold block. According to the in Figure 5.2 illustrated embodiment, the installation location of the integrated throttle 42 in the high-pressure accumulator 40 with integrated manifold block according to the distribution of the high-pressure accumulator volumes 44 and 46 are freely selected. Also, the clamped throttle 92 has a throttle channel 88 with diameter stage.

In Figur 5.3 ist eine Ausführungsvariante für eine integrierte Drossel dargestellt, die zweiteilig ausgebildet ist und eine Schraubverbindung aufweist.In Figure 5.3 a variant embodiment of an integrated throttle is shown, which is formed in two parts and has a screw connection.

Figur 5.3 ist entnehmbar, dass die integrierte Drossel 42 als eingeschraubte Drossel 96 ausgebildet ist und einen Schraubteil 98 und einen Gewindeteil 100 aufweist. Sowohl der Gewindeteil 100 als auch der Schraubteil 98 liegen an einer Durchmesserstufe 86 an, die an der Innenwand 94 des Hochdruckspeichers 40 mit integriertem Verteilerblock ausgebildet ist. Der Gewindeteil 100 und der Schraubteil 98 weisen jeweils einen Werkzeugansatz 102 auf, über welchen der Schraubteil 98 und der Gewindeteil 100 verschraubt werden, bis deren jeweilige Stirnseiten an der Durchmesserstufe 86 der Innenwand 96 des Hochdruckspeichers 40 mit integriertem Verteilerblock anliegen und dort mit definiertem Drehmoment gegeneinander verschraubt werden. Der Schraubteil 98 weist den bereits erwähnten Drosselkanal 88 mit Durchmesserstufe auf. Über die in Figur 5, Figur 5.1, Figur 5.2 und Figur 5.3 dargestellten Ausführungsvarianten der integrierten Drossel 42 kann der in Figur 2 dargestellte Hochdruckspeicher 40 mit integriertem Verteilerblock ebenfalls in ein erstes Hochdruckspeichervolumen 44 und ein zweites Hochdruckspeichervolumen 46 aufgeteilt werden, wobei das zweite Hochdruckspeichervolumen 46 als integrierter Verteilerblock dient, in dem Druckpulsationen im unter Systemdruck stehenden Kraftstoff gedämpft werden. In vorteilhafter Weise stehen das zweite Hochdruckspeichervolumen 46, welches den integrierten Verteilerblock bildet, über eine Verbindungsleitung mit Dämpfungsdrossel 26 mit dem zweiten Hochdruckspeicher 20, wie in Figur 2 dargestellt, in Verbindung. Figure 5.3 can be removed that the integrated throttle 42 is formed as a screwed throttle 96 and has a screw 98 and a threaded portion 100. Both the threaded part 100 and the screw 98 abut against a diameter stage 86 which is formed on the inner wall 94 of the high-pressure accumulator 40 with integrated manifold block. The threaded portion 100 and the screw 98 each have a tool attachment 102, via which the screw 98 and the threaded portion 100 are screwed until their respective end faces abut against the diameter step 86 of the inner wall 96 of the high-pressure accumulator 40 with integrated manifold and there with defined torque against each other be screwed. The screw 98 has the already mentioned throttle channel 88 with diameter stage. About the in FIG. 5, FIG. 5.1 . FIG. 5.2 and FIG. 5.3 illustrated embodiments of the integrated throttle 42, the in FIG. 2 High-pressure accumulators 40 with integrated distributor block 40 are likewise divided into a first high-pressure accumulator volume 44 and a second high-pressure accumulator volume 46, the second high-pressure accumulator volume 46 serving as an integrated distributor block, in which pressure pulsations in fuel under system pressure are damped. Advantageously, the second high-pressure accumulator volume 46, which forms the integrated distributor block, is connected to the second high-pressure accumulator 20 via a connecting line with damping restrictor 26, as in FIG FIG. 2 shown in connection.

Während Druckpulsationen, die beim Einspritzvorgang in die Brennräume einer Verbrennungskraftmaschine an den Kraftstoffinjektoren auftreten, über die in den Injektorzuleitungen 28 ausgebildeten Drosseln 30 bzw. 58 gedämpft werden, werden Druckpulsationen zwischen der Hochdruckpumpe 12, übertragen durch die Druckleitungen 48 über das zweite Hochdruckspeichervolumen 46 im Hochdruckspeicher 40 mit integriertem Verteilerblock gedämpft.While pressure pulsations that occur during the injection process in the combustion chambers of an internal combustion engine at the fuel injectors, are attenuated via the formed in the Injektorzuleitungen 28 throttles 30 and 58, pressure pulsations between the high-pressure pump 12, transmitted through the pressure lines 48 via the second high-pressure accumulator volume 46 in the high-pressure accumulator 40 with integrated distribution block damped.

Claims (9)

  1. Fuel injection system (10) for a multi-cylinder internal combustion engine, having a first high-pressure accumulator (18, 40) and having a second high-pressure accumulator (20) and having a high-pressure pump (12), the first and the second high-pressure accumulators (18, 40; 20) having a number of ports (60) for injector feed lines (28) corresponding to the number of cylinders of the internal combustion engine, and a damping volume (46) for damping pressure pulsations between the high-pressure accumulators (18, 40; 20) and between the high-pressure accumulators (18, 40; 20) and the high-pressure pump (12) being integrated into one of the high-pressure accumulators (18, 40; 20), characterized in that the high-pressure accumulator volume which serves as a damping volume (46) is formed at that end of the high-pressure accumulator (18, 40; 20) to which the high-pressure pump (12) which supplies fuel to the respective high-pressure accumulator (18, 40; 20) is connected.
  2. Fuel injection system according to Claim 1, characterized in that the total volume of a high-pressure accumulator (40) is divided by an integrated throttle (42) into a first high-pressure accumulator volume (44) and a second high-pressure accumulator volume (46) which serves as a damping volume.
  3. Fuel injection system according to Claim 2, characterized in that the second high-pressure accumulator volume (46) is smaller than the first high-pressure accumulator volume (44).
  4. Fuel injection system according to Claim 2, characterized in that a connecting line with a damper throttle (26) runs from the second high-pressure accumulator volume (46) to the second high-pressure accumulator (20).
  5. Fuel injection system according to Claim 2, characterized in that the integrated throttle (42) is formed as a through bore (62) in the high-pressure accumulator (40) between sections, situated to both sides, of a deep-hole bore (46).
  6. Fuel injection system according to Claim 2, characterized in that the integrated throttle (42) is formed as an opening in a base surface of a sleeve-shaped insert (72) which can be fixed by means of a port (64), or of a single-part insert piece (78) which has a port.
  7. Fuel injection system according to Claim 2, characterized in that the integrated throttle (42) is fixed in the high-pressure accumulator (40) as a single-part press-in throttle (84) or as a multi-part press-in throttle (82, 84).
  8. Fuel injection system according to Claim 2, characterized in that the integrated throttle (42) is formed in the high-pressure accumulator (40) as a throttle (92) which is clamped in the high-pressure accumulator (40) by means of an annular clamping element (90) or as a throttle (42) which comprises a thread part (100) and a screw part (98) and which is screwed in.
  9. Use of the fuel injection system according to one of Claims 1 to 8 in internal combustion engines, in particular multi-cylinder internal combustion engines which have two high-pressure accumulators (18, 40; 20) and two cylinder banks.
EP06830244A 2006-01-26 2006-11-30 High-pressure accumulator body with integrated distributor block Active EP1982070B1 (en)

Applications Claiming Priority (2)

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DE102006003639A DE102006003639A1 (en) 2006-01-26 2006-01-26 Fuel-injection system used in multicylindered internal combustion engines comprises a volume in a high-pressure reservoir for damping pressure pulses between high-pressure reservoirs and between the reservoirs and a high-pressure pump
PCT/EP2006/069147 WO2007085313A1 (en) 2006-01-26 2006-11-30 High-pressure accumulator body with integrated distributor block

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EP1982070A1 EP1982070A1 (en) 2008-10-22
EP1982070B1 true EP1982070B1 (en) 2011-04-20

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US (1) US7827962B2 (en)
EP (1) EP1982070B1 (en)
JP (1) JP5135230B2 (en)
KR (1) KR101100957B1 (en)
CN (1) CN101438052B (en)
AT (1) ATE506532T1 (en)
DE (2) DE102006003639A1 (en)
WO (1) WO2007085313A1 (en)

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KR101100957B1 (en) 2011-12-29
US7827962B2 (en) 2010-11-09
JP5135230B2 (en) 2013-02-06
CN101438052A (en) 2009-05-20
EP1982070A1 (en) 2008-10-22
DE102006003639A1 (en) 2007-08-02
ATE506532T1 (en) 2011-05-15
JP2009524761A (en) 2009-07-02
WO2007085313A1 (en) 2007-08-02
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DE502006009376D1 (en) 2011-06-01
KR20080089667A (en) 2008-10-07

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