EP1982070A1 - High-pressure accumulator body with integrated distributor block - Google Patents

High-pressure accumulator body with integrated distributor block

Info

Publication number
EP1982070A1
EP1982070A1 EP06830244A EP06830244A EP1982070A1 EP 1982070 A1 EP1982070 A1 EP 1982070A1 EP 06830244 A EP06830244 A EP 06830244A EP 06830244 A EP06830244 A EP 06830244A EP 1982070 A1 EP1982070 A1 EP 1982070A1
Authority
EP
European Patent Office
Prior art keywords
pressure accumulator
pressure
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.)
Granted
Application number
EP06830244A
Other languages
German (de)
French (fr)
Other versions
EP1982070B1 (en
Inventor
Christoph Weizenauer
Jochen Walther
Markus Degn
Gernot Payer
Sven Voelter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1982070A1 publication Critical patent/EP1982070A1/en
Application granted granted Critical
Publication of EP1982070B1 publication Critical patent/EP1982070B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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

  • DE 100 60 785 A1 relates to a fuel injection device with a high-pressure fuel accumulator.
  • Branch pipes can be screwed to the high-pressure fuel accumulator, each of which contains 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. For this, e.g.
  • connection bores of the high-pressure accumulator common rail
  • 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 injection device for a diesel engine.
  • a fuel injection device comprises a high-pressure fuel accumulator and a plurality of the fuel discharge from the high-pressure fuel storage branch pipes serving. These each have at their one end a connection head for connecting the branch pipe to an associated connecting piece of the high-pressure fuel accumulator, wherein a throttle is mounted in each of the branch pipes.
  • 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 one another via a connecting line, which ensures 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 smaller volume of the respective high-pressure accumulator representing the distributor block is preferably located at the end of the high-pressure accumulator to which the high-pressure pumps branching off from the high-pressure pump and supplying the high-pressure accumulator with fuel are connected.
  • the other high-pressure accumulator is supplied by the aforementioned high-pressure accumulator, in which the distributor block is integrated, via a connecting line with fuel whose Mündungsstelle is integrated in the further high-pressure accumulator, a damping throttle.
  • inventively proposed solution of 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 accumulator 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 if 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.
  • the integrated throttle may e.g. be performed as a hole in a diameter bar of the high-pressure accumulator (common rail).
  • the cavity is delimited by a deep hole bore introduced on both sides of the tubular high-pressure reservoir.
  • the two deep hole drilling sections separating web can then be introduced a stepped throttle channel having integrated throttle.
  • the mutually assigning end regions of the deep-hole bores introduced into the high-pressure reservoir on both sides can also be rounded in order to improve the flow properties of the fuel within the cavity of the high-pressure reservoir.
  • in a continuous cavity e.g.
  • a sleeve-shaped component can be inserted, which at one end, preferably the middle region of the high-pressure accumulator facing end in a Bodenfiambae has a throttle opening.
  • 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.
  • the connection acted upon by the high-pressure pump and the throttle-bore sleeve let into the hollow space of the high-pressure accumulator can also be manufactured as a built-in part, which may be e.g. can be fixed by a biting edge on an end face of the high-pressure accumulator in this.
  • 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 relevant high-pressure accumulator (common rail).
  • the position of the integrated throttle within the cavity of the high-pressure accumulator can be chosen as desired. so that the two individual volumes within the high-pressure accumulator can be freely selected and freely specified.
  • 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 shows a fuel injection system according to the prior art with a distributor block, which is manufactured as a separate component
  • FIG. 2 shows 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),
  • FIG. 3.1 shows a built-in throttle as a through-bore in the high-pressure accumulator
  • FIG. 3.2 shows a variant embodiment of the integrated throttle illustrated in FIG. 3.1, wherein the end faces of rounded sections of a deep hole bore in the high-pressure accumulator are rounded;
  • FIG. 4.1 shows a variant embodiment of the integrated throttle, which is embodied in a sleeve-shaped body which is inserted into the cavity of the high-pressure accumulator;
  • FIG. 4.2 shows a variant embodiment, according to which the integrated throttle is embodied in a one-piece component, a sleeve-shaped section and a connection part,
  • FIG. 5 shows a variant embodiment of the integrated throttle, which is designed as a press-fit throttle.
  • FIG. 5.1 shows an integrally formed integrated throttle as a press-in throttle element,
  • FIG. 5.2 shows a throttle integrated into the hollow space of the high-pressure accumulator by means of a ring tensioning element
  • FIG. 5.3 shows a two-part integrated throttle, a threaded part and a screw part.
  • FIG. 1 shows a fuel injection system known from the prior art for multi-cylinder internal combustion engines, in which the distributor block is designed as a separate component.
  • a fuel injection system 10 comprises a high-pressure pump 12 which applies fuel to a distributor block 14 designed as a separate component.
  • 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 in order to dampen pressure pulsations between the fuel injectors (not shown in FIG. 1) and the respective high-pressure accumulators 18 and 20.
  • four fuel injectors each are supplied with fuel at system pressure via the two high-pressure accumulators 18 and 20, which are assigned to the respective cylinders of two cylinder banks of a multi-cylinder internal combustion engine.
  • the illustration according to FIG. 2 shows the fuel injection system 10 proposed according to the invention.
  • the illustration according to FIG. 2 shows that the fuel injection system 10 has a high-pressure accumulator 40 with an integrated distributor 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 accumulators 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. Accordingly, with the fuel injection system 10 shown in FIG. 2, the cylinders of two cylinder banks of an 8-cylinder internal combustion engine can be supplied with fuel under system pressure.
  • the fuel injection system 10 as shown in Figure 2 can of course also be modified so that a V-shaped designed six-cylinder engine can be equipped with it, instead of the embodiment shown in Figure 2 of the fuel injection system 10 for 8-cylinder internal combustion engines, can also internal combustion engines with the According to the invention proposed fuel injection system are equipped, which have an even higher number of cylinders.
  • the high-pressure accumulator 40 with integrated distributor block has an integrated throttle 42, so that its total volume is subdivided 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 storage volume 46, i. the distributor block integrated into the high-pressure accumulator 40 is preferably located at the end at which the high-pressure accumulator 40 with integrated distributor block is subjected to 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 in the same way as the second high-pressure accumulator 20 shown in FIG.
  • the fuel injection system 10 according to the invention as shown in FIG. 2 saves the distributor block 14 shown as a separate component in FIG. 1, so that a smaller space requirement for the fuel injection system 10 proposed according to the invention results in the cylinder head region of a multi-cylinder internal combustion engine with two cylinder banks.
  • FIG. 3.1 shows a variant of the integrated throttle which is designed as a through-bore.
  • FIG. 3.1 shows that the high-pressure accumulator 40 with integrated distributor 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.
  • FIG. a port 64 to which the high pressure pump 12 is connected.
  • the reference numeral 60 designates the connection of the injector supply line 28, wherein injection throttles 58 are embedded in the wall 68 of the high-pressure accumulator 40 with integrated distributor block.
  • injection throttle 48 pressure pulsations between the fuel injectors, not shown in FIG. 3.1, and the cavity 54 of the high-pressure accumulator 40 with integrated distributor block are damped.
  • FIG. 3.2 shows a variant of the integrated throttle shown in FIG. 3.1.
  • the integrated throttle 42 is likewise embodied as a through-drilled throttle 62 with a stepped throttling channel, but the facing end sides of the two bore sections of the deep-hole bore 56 in the high-pressure accumulator 40 with integrated distributor block are each provided with a recess 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.
  • pressure-reducing throttles 58 are introduced, which provide pressure pulsations between the cavity 54 and the injector supply lines 28 connected to the connections 60 to the fuel injectors the multi-cylinder 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.
  • 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.
  • From Figure 4.1 shows that the cavity 54 of the high pressure accumulator 40 with integrated manifold block is divided by a sleeve 72 having a Bodenfikiee with throttle bore in the first high-pressure accumulator volume 44 and the second high-pressure accumulator volume 46.
  • the sleeve 72 comprises a Bodenfikiee in which the integrated throttle 42 is designed as a simple producible 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.
  • 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.
  • FIG. 4.2 shows a variant of the configuration shown in FIG. 4.1.
  • FIG. 4.2 From the illustration according to FIG. 4.2, it can be seen that the components shown in FIG. 4.1, namely the sleeve 72 and the connection 64 for the pressure feed line 48 of the high-pressure pump, can be made in one piece as a common insert 78.
  • 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 At the end facing the cavity 54, the one-piece insert 78 on a Bodenfizze, 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 holes in the wall 68 of the high pressure accumulator 40 with integrated manifold block and are located below the ports 60 for the injector supply lines 38.
  • Figure 5 is a variant for an integrated throttle refer to, which is designed as Einpressdrossel.
  • the integrated throttle 42 which is designed as a pressed-in throttle 80, separates the second high-pressure accumulator volume 46 from the first high-pressure accumulator volume 44.
  • the injection location, i. the axial length of the cavity 54, on which the integrated throttle 42 designed as pressed-in throttle 80 is fixed, the size of the first high-pressure storage volume 44 and the size of the second high-pressure storage volume 46 in the cavity 54 of the high-pressure accumulator 40 with integrated distributor block can be exactly predetermined.
  • the pressed-in throttle 80 shown in FIG. 5 the latter has an annular body 82 as well as 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.
  • FIG. 5.1 shows an embodiment variant of an integrated throttle designed as a press-fit throttle according to FIG. 5.
  • FIG. 5.1 shows that a diameter step 86 is formed on an inner wall 94 of the high-pressure accumulator 40 with integrated distributor block, against 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 volume 44 from the second high-pressure accumulator volume 46.
  • the collar formed on the throttle body 84 faces the second high-pressure accumulator volume 46 within the cavity 54 of the high-pressure accumulator 40 with integrated manifold block to.
  • 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.
  • FIG. 5.3 shows a variant embodiment for an integrated throttle, which is designed in two parts and has a screw connection.
  • the integrated throttle 42 is configured as a screwed-in restrictor 96 and has a screw part 98 and a threaded part 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.

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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

Beschreibungdescription
Titeltitle
Hochdruckspeicherkörper mit integriertem VerteilerblockHigh-pressure accumulator body with integrated distributor block
Stand der TechnikState of the art
DE 100 60 785 Al bezieht sich auf eine Kraftstoffeinspritzeinrichtung mit einem Kraftstoffhochdruckspeicher. An dem Kraftstoffhochdruckspeicher sind Abzweigrohre anschraubbar, die jeweils eine Drossel zum Abbau von Druckpulsationen in der Kraftstoffeinspritzeinrich- tung 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 Hochdruckspei- chers (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 relates to a fuel injection device with a high-pressure fuel accumulator. Branch pipes can be screwed to the high-pressure fuel accumulator, each of which contains 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, e.g. cylindrical throttling pieces in connection bores of the high-pressure accumulator (common rail), which lead to the individual fuel injectors or also to the high-pressure accumulator acting on the high-pressure accumulator, are pressed in. 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.
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 Ab- zweigrohrs 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. 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 Verbin- dungsleitung 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 auf- rechterhält. Vom durch die Hochdruckpumpe beaufschlagten Verteilerblock, in dem Schwingungen gedämpft werden, werden die beiden Hochdruckspeicher mit Kraftstoff versorgt.DE 20 2004 019 820.7 relates to a fuel injection device for a diesel engine. A fuel injection device comprises a high-pressure fuel accumulator and a plurality of the fuel discharge from the high-pressure fuel storage branch pipes serving. These each have at their one end a connection head for connecting the branch pipe to an associated connecting piece of the high-pressure fuel accumulator, wherein a throttle is mounted in each of the branch pipes. 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 one another via a connecting line, which ensures 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 VoIu- men des betreffenden Hochdruckspeichers liegt bevorzugt 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 Mün- dungsstelle 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 smaller volume of the respective high-pressure accumulator representing the distributor block is preferably located at the end of the high-pressure accumulator to which the high-pressure pumps branching off from the high-pressure pump and supplying the high-pressure accumulator with fuel are connected. The other high-pressure accumulator is supplied by the aforementioned high-pressure accumulator, in which the distributor block is integrated, via a connecting line with fuel whose Mündungsstelle 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 Hochdruck- speichern 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 eben- falls 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 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 accumulator 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 according to the invention, the distribution block integrated in one of the high-pressure accumulators likewise dampens if 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 Verfügung:In order to realize the integrated throttle and the resulting division of the high-pressure storage volume into two individual volumes, several variants are available:
Die integrierte Drossel kann z.B. als eine Bohrung in einem Durchmessersteg des Hoch- druckspeichers (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 zuwei- senden Endbereiche der beidseits in den Hochdruckspeicher eingebrachten Tiefiochbohrun- gen 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 Bodenfiäche 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.The integrated throttle may e.g. be performed as a hole 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 assigning end regions of the deep-hole bores introduced into the high-pressure reservoir on both sides can also be rounded in order to improve the flow properties of the fuel within the cavity of the high-pressure reservoir. In a further embodiment, in a continuous cavity, e.g. can be formed as a through hole in the high-pressure accumulator body, a sleeve-shaped component can be inserted, which at one end, preferably the middle region of the high-pressure accumulator facing end in a Bodenfiäche has a throttle opening. 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 variant, the connection acted upon by the high-pressure pump and the throttle-bore sleeve let into the hollow space of the high-pressure accumulator can also be manufactured as a built-in part, which may be e.g. can be fixed by a biting edge on an end face of the high-pressure accumulator in this.
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 einge- presst 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 wer- den, 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 relevant 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 as desired. so that the two individual volumes within the high-pressure accumulator can be freely selected and freely specified.
In einer weiteren Ausführungsvariante kann die integrierte Drossel als zweiteiliges Bauele- ment 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:It shows:
Figur 1 ein Kraftstoffeinspritzsystem gemäß des Standes der Technik mit einem Verteilerblock, der als separates Bauteil gefertigt ist,1 shows a fuel injection system according to the prior art with a distributor block, which is manufactured as a separate component,
Figur 2 das erfindungsgemäß vorgeschlagene Kraftstoffeinspritzsystem, bei welchem der Verteilerblock in einen der Hochdruckspeicher (Common Rail) integriert ist,FIG. 2 shows 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),
Figur 3.1 eine als Durchgangsbohrung im Hochdruckspeicher ausgebildete integrierte Drossel,FIG. 3.1 shows a built-in throttle as a through-bore in the high-pressure accumulator, FIG.
Figur 3.2 eine Ausführungsvariante der in Figur 3.1 dargestellten integrierten Drossel, wobei die Stirnseiten von Abschnitten einer Tiefiochbohrung im Hochdruckspeicher verrundet ausgebildet sind,FIG. 3.2 shows a variant embodiment of the integrated throttle illustrated in FIG. 3.1, wherein the end faces of rounded sections of a deep hole bore in the high-pressure accumulator are rounded;
Figur 4.1 eine Ausführungsvariante der integrierten Drossel, die in einem hülsenförmigen Körper ausgebildet ist, der in den Hohlraum des Hochdruckspeichers eingeschoben wird,FIG. 4.1 shows a variant embodiment of the integrated throttle, which is embodied in a sleeve-shaped body which is inserted into the cavity of the high-pressure accumulator;
Figur 4.2 eine Ausführungsvariante, wonach die integrierte Drossel in einem einstückigen Bauteil, einem hülsenförmigen Abschnitt und einen Anschlussteil umfassend ausgeführt ist,FIG. 4.2 shows a variant embodiment, according to which the integrated throttle is embodied in a one-piece component, a sleeve-shaped section and a connection part,
Figur 5 eine Ausführungsvariante der integrierten Drossel, die als Einpressdrossel beschaffen ist, Figur 5.1 eine einstückig ausgebildete integrierte Drossel als Einpressdrosselelement,FIG. 5 shows a variant embodiment of the integrated throttle, which is designed as a press-fit throttle. FIG. 5.1 shows an integrally formed integrated throttle as a press-in throttle element,
Figur 5.2 eine mittels eines Ringspannelements in den Hohlraum des Hochdruckspeichers integrierte Drossel undFIG. 5.2 shows a throttle integrated into the hollow space of the high-pressure accumulator by means of a ring tensioning element
Figur 5.3 eine zweiteilig ausgebildete integrierte Drossel, einen Gewindeteil und einen Schraubenteil umfassend.FIG. 5.3 shows 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 illustration according to FIG. 1 shows a fuel injection system known from the prior art for multi-cylinder internal combustion engines, in which the distributor 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.It can be seen from the illustration according to FIG. 1 that a fuel injection system 10 comprises a high-pressure pump 12 which applies fuel to a distributor block 14 designed as a separate component. 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 je- weils vier Kraftstoffinjektoren mit unter Systemdruck stehendem Kraftstoff versorgt, die die jeweiligen Zylinder zweier Zylinderbänke einer mehrzylindrigen Verbrennungskraftmaschine zugeordnet sind. Der Darstellung gemäß Figur 2 ist das erfindungsgemäß vorgeschlagene Kraftstoffeinspritzsystem 10 zu entnehmen.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 in order to dampen pressure pulsations between the fuel injectors (not shown in FIG. 1) and the respective high-pressure accumulators 18 and 20. In the embodiment variant of the fuel injection system 10 shown in FIG. 1, four fuel injectors each are supplied with fuel at system pressure via the two high-pressure accumulators 18 and 20, which are assigned to the respective cylinders of two cylinder banks of a multi-cylinder internal combustion engine. The illustration according to FIG. 2 shows the fuel injection system 10 proposed according to the invention.
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 rohr- förmig 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.The illustration according to FIG. 2 shows that the fuel injection system 10 has a high-pressure accumulator 40 with an integrated distributor 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 accumulators 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. Accordingly, with the fuel injection system 10 shown in FIG. 2, the cylinders of two cylinder banks of an 8-cylinder internal combustion engine can be supplied with fuel under system pressure. The fuel injection system 10 as shown in Figure 2 can of course also be modified so that a V-shaped designed six-cylinder engine can be equipped with it, instead of the embodiment shown in Figure 2 of the fuel injection system 10 for 8-cylinder internal combustion engines, can also internal combustion engines with the According to the invention proposed fuel injection system are equipped, 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 Kraft- stoff 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. 1, the high-pressure accumulator 40 with integrated distributor block has an integrated throttle 42, so that its total volume is subdivided 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 storage volume 46, i. the distributor block integrated into the high-pressure accumulator 40 is preferably located at the end at which the high-pressure accumulator 40 with integrated distributor block is subjected to 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. Durch das in Figur 2 dargestellte erfindungsgemäße KraftstofTeinspritzsystem 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 Kraftstoffeinspritz- System 10 ergibt.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 in the same way as the second high-pressure accumulator 20 shown in FIG. The fuel injection system 10 according to the invention as shown in FIG. 2 saves the distributor block 14 shown as a separate component in FIG. 1, so that a smaller space requirement for the fuel injection system 10 proposed according to the invention results in the cylinder head region of a multi-cylinder internal combustion engine with two cylinder banks.
Figur 3.1 ist eine als Durchgangsbohrung beschaffene Ausführungsvariante der integrierten Drossel zu entnehmen.FIG. 3.1 shows a variant of the integrated throttle which is designed as a through-bore.
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 integ- rierte 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.FIG. 3.1 shows that the high-pressure accumulator 40 with integrated distributor 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 web 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. In the embodiment shown in FIG. 3.1, the reference numeral 60 designates the connection of the injector supply line 28, wherein injection throttles 58 are embedded in the wall 68 of the high-pressure accumulator 40 with integrated distributor block. By means of the injection throttle 48, pressure pulsations between the fuel injectors, not shown in FIG. 3.1, and the cavity 54 of the high-pressure accumulator 40 with integrated distributor block are 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 Tieflochboh- rung 56 im Hochdruckspeicher 40 mit integriertem Verteilerblock jeweils mit einer Verrun- dung 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 illustration according to FIG. 3.2 shows a variant of the integrated throttle shown in FIG. 3.1. As shown in FIG. 3.2, the integrated throttle 42 is likewise embodied as a through-drilled throttle 62 with a stepped throttling channel, but the facing end sides of the two bore sections of the deep-hole bore 56 in the high-pressure accumulator 40 with integrated distributor block are each provided with a recess 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. In the embodiment variant of the fuel injection system 10 proposed according to the invention, in the wall 68 of the high-pressure accumulator 40 with integrated distributor block, pressure-reducing throttles 58 are introduced, which provide pressure pulsations between the cavity 54 and the injector supply lines 28 connected to the connections 60 to the fuel injectors the multi-cylinder 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 Bodenfiäche mit Drosselbohrung aufweist in das erste Hochdruckspeichervolumen 44 und das zweite Hochdruckspeichervolumen 46 unterteilt ist. Die Hülse 72 umfasst eine Bodenfiäche, 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.From Figure 4.1 shows that the cavity 54 of the high pressure accumulator 40 with integrated manifold block is divided by a sleeve 72 having a Bodenfiäche with throttle bore in the first high-pressure accumulator volume 44 and the second high-pressure accumulator volume 46. The sleeve 72 comprises a Bodenfiäche in which the integrated throttle 42 is designed as a simple producible 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.FIG. 4.2 shows a variant of the configuration shown in FIG. 4.1.
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 Bodenfiäche 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 Hochdruck- speichervolumen 46 dargestellt. Im Unterschied zur in Figur 4.1 dargestellten Ausführungsvariante 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. Figur 5 ist eine Ausführungsvariante für eine integrierte Drossel zu entnehmen, die als Einpressdrossel ausgebildet ist.From the illustration according to FIG. 4.2, it can be seen that the components shown in FIG. 4.1, namely the sleeve 72 and the connection 64 for the pressure feed line 48 of the high-pressure pump, can be made in one piece as a common insert 78. 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 on a Bodenfiäche, 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. In contrast to the embodiment variant shown in Figure 4.1 no Einpressdrosseln 58 are formed in the wall 68 of the high-pressure accumulator 40 with integrated manifold block, the damper throttles 30 are realized as simple holes in the wall 68 of the high pressure accumulator 40 with integrated manifold block and are located below the ports 60 for the injector supply lines 38. Figure 5 is a variant for an integrated throttle refer to, 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 an integrated manifold block, the integrated throttle 42, which is designed as a pressed-in throttle 80, separates the second high-pressure accumulator volume 46 from the first high-pressure accumulator volume 44. The injection location, i. the axial length of the cavity 54, on which the integrated throttle 42 designed as pressed-in throttle 80 is fixed, the size of the first high-pressure storage volume 44 and the size of the second high-pressure storage volume 46 in the cavity 54 of the high-pressure accumulator 40 with integrated distributor block can be exactly predetermined. In the embodiment of the pressed-in throttle 80 shown in FIG. 5, the latter has an annular body 82 as well as 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.FIG. 5.1 shows an embodiment variant of an integrated throttle designed as a press-fit 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 ei- nem 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.The illustration according to FIG. 5.1 shows that a diameter step 86 is formed on an inner wall 94 of the high-pressure accumulator 40 with integrated distributor block, against 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 volume 44 from the second high-pressure accumulator volume 46. The collar formed on the throttle body 84 faces the second high-pressure accumulator volume 46 within the cavity 54 of the high-pressure accumulator 40 with integrated manifold block to.
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. In Figur 5.3 ist eine Ausführungsvariante für eine integrierte Drossel dargestellt, die zweiteilig ausgebildet ist und eine Schraubverbindung aufweist.From the illustration according to FIG. 5.2, it can be seen that a clamped throttle 92 is fixed on the wall 68 on the inner wall 94 of the high-pressure accumulator 40 with integrated distributor block via a ring tensioning element 90. According to the embodiment variant shown in FIG. 5.2, the installation location of the integrated throttle 42 in the high-pressure accumulator 40 with integrated distributor block can be freely selected in accordance with the division of the high-pressure accumulator volumes 44 and 46. Also, the clamped throttle 92 has a throttle channel 88 with diameter stage. FIG. 5.3 shows a variant embodiment for an integrated throttle, which is designed 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.It can be seen from FIG. 5.3 that the integrated throttle 42 is configured as a screwed-in restrictor 96 and has a screw part 98 and a threaded part 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. The illustrated in Figure 5, Figure 5.1, Figure 5.2 and Figure 5.3 embodiments of the integrated throttle 42, the high-pressure accumulator 40 shown in Figure 2 with integrated manifold block also into a first high-pressure accumulator volume 44 and a second high-pressure accumulator volume 46 are divided, the second high-pressure accumulator volume 46th serves 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 via a connecting line with damping throttle 26 to the second high-pressure accumulator 20, as shown in FIG.
Während Druckpulsationen, die beim Einspritzvorgang in die Brennräume einer Verbren- nungskraftmaschine 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 which 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 46th damped in the high-pressure accumulator 40 with integrated manifold block.

Claims

Patentansprüche claims
1. Kraftstoffeinspritzsystem (10) für eine mehrzylindrige Verbrennungskraftmaschine mit einem ersten Hochdrucksspeicher (18, 40) und einem zweiten Hochdruckspeicher (20) und mit einer Hochdruckpumpe (12), wobei der erste und der zweite Hochdruckspeicher (18, 40; 20) eine der Anzahl der Zylinder der Verbrennungskraftmaschine entsprechende Anzahl von Anschlüssen (60) für Injektorzuleitungen (28) aufweisen, dadurch gekennzeichnet, dass ein Dämpfungsvolumen (46) zur Dämpfung von Druckpulsationen zwischen den Hochdruckspeichern (18, 40; 20) und zwischen den Hochdruckspeichern (18, 40; 20) und der Hochdruckpumpe (12) in einen derA fuel injection system (10) for a multi-cylinder internal combustion engine having a first high pressure accumulator (18, 40) and a second high pressure accumulator (20) and a high pressure pump (12), said first and second high pressure accumulators (18, 40; Number of cylinders of the internal combustion engine corresponding number of connections (60) for Injektorzuleitungen (28), characterized in that 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) in one of
Hochdruckspeicher (18, 40; 20) integriert ist.High-pressure accumulator (18, 40, 20) is integrated.
2. Kraftstoffeinspritzsystem gemäß Anspruch 1, dadurch gekennzeichnet, dass das Gesamtvolumen eines Hochdruckspeichers (40) durch eine integrierte Drossel (40) in ein erstes Hochdruckspeichervolumen (44) und ein zweites, als Dämpfungsvolumen dienendes Hochdruckspeichervolumen (46) geteilt ist.2. Fuel injection system according to claim 1, characterized in that the total volume of a high-pressure accumulator (40) through an integrated throttle (40) in a first high-pressure accumulator volume (44) and a second, serving as a damping volume high-pressure accumulator volume (46) is divided.
3. Kraftstoffeinspritzsystem gemäß Anspruch 2, dadurch gekennzeichnet, dass das zweite Hochdruckspeichervolumen (46) kleiner als das erste Hochdruckspeichervolumen (44) ist.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. Kraftstoffeinspritzsystem gemäß Anspruch 1, dadurch gekennzeichnet, dass das als Dämpfungsvolumen dienende zweite Hochdruckspeichervolumen (46) im Hochdruckspeicher (40) an dem der Hochdruckpumpe (12) zuweisenden Ende ausgebildet ist.4. Fuel injection system according to claim 1, characterized in that serving as a damping volume second high-pressure accumulator volume (46) in the high-pressure accumulator (40) at the high-pressure pump (12) facing end is formed.
5. Kraftstoffeinspritzsystem gemäß Anspruch 1, dadurch gekennzeichnet, dass eine Verbindungsleitung mit Dämpferdrossel (26) vom zweiten Hochdruckspeichervolumen (46) aus zum zweiten Hochdruckspeicher (20) verläuft.5. Fuel injection system according to claim 1, characterized in that a connecting line with damper throttle (26) extends from the second high-pressure accumulator volume (46) to the second high-pressure accumulator (20).
6. Kraftstoffeinspritzsystem gemäß Anspruch 2, dadurch gekennzeichnet, dass die integrierte Drossel (42) als Durchgangsbohrung (62) im Hochdruckspeicher (40) zwischen beidseitigen Abschnitten einer Tieflochbohrung (46) ausgeführt ist.6. Fuel injection system according to claim 2, characterized in that the integrated throttle (42) as a through hole (62) in the high-pressure accumulator (40) between two-sided sections of a deep hole (46) is executed.
7. Kraftstoffeinspritzsystem gemäß Anspruch 2, dadurch gekennzeichnet, dass die integ- rierte Drossel (42) als Öffnung in einer Bodenfiäche eines mittels eines Anschlusses7. Fuel injection system according to claim 2, characterized in that the integrated throttle (42) as an opening in a Bodenfiäche one by means of a connection
(64) fixierbaren hülsenförmigen Einsatzes (72) oder eines einteiligen, einen Anschluss aufweisenden Einsatzstücks (78) ausgeführt ist. (64) fixable sleeve-shaped insert (72) or a one-piece, a connection having insert (78) is executed.
8. Kraftstoffeinspritzsystem gemäß Anspruch 2, dadurch gekennzeichnet, dass die integrierte Drossel (42) als einteilige Einpressdrossel (84) oder als mehrteilige Einpressdrossel (82, 84) im Hochdruckspeicher (40) fixiert ist.8. Fuel injection system according to claim 2, characterized in that the integrated throttle (42) is fixed as a one-piece Einpressdrossel (84) or as a multi-part Einpressdrossel (82, 84) in the high-pressure accumulator (40).
9. Kraftstoffeinspritzsystem gemäß Anspruch 2, dadurch gekennzeichnet, dass die integrierte Drossel (42) als mittels eines Ringspannelements (90) im Hochdruckspeicher (40) eingespannte Drossel (92) oder als eine ein Motorteil (100) und ein Schraubteil (98) umfassende eingeschraubte Drossel (46) im Hochdruckspeicher (40) ausgeführt ist.9. Fuel injection system according to claim 2, characterized in that the integrated throttle (42) as by means of a ring tensioning element (90) in the high-pressure accumulator (40) clamped throttle (92) or as a motor part (100) and a screw (98) comprising screwed Throttle (46) in the high-pressure accumulator (40) is executed.
10. Verwendung des Kraftstoffeinspritzsystems gemäß der Ansprüche 1 bis 9 an Verbrennungskraftmaschinen, insbesondere mehrzylindrigen, zwei Hochdruckspeicher (18, 40; 20) und zwei Zylinderbänke aufweisenden Verbrennungskraftmaschinen. 10. The use of the fuel injection system according to claims 1 to 9 on internal combustion engines, in particular multi-cylinder, two high-pressure accumulator (18, 40, 20) and two cylinder banks having internal combustion engines.
EP06830244A 2006-01-26 2006-11-30 High-pressure accumulator body with integrated distributor block Active EP1982070B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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 true EP1982070A1 (en) 2008-10-22
EP1982070B1 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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Publication number Publication date
JP5135230B2 (en) 2013-02-06
EP1982070B1 (en) 2011-04-20
WO2007085313A1 (en) 2007-08-02
JP2009524761A (en) 2009-07-02
US20090223486A1 (en) 2009-09-10
ATE506532T1 (en) 2011-05-15
KR101100957B1 (en) 2011-12-29
US7827962B2 (en) 2010-11-09
DE102006003639A1 (en) 2007-08-02
DE502006009376D1 (en) 2011-06-01
CN101438052A (en) 2009-05-20
KR20080089667A (en) 2008-10-07
CN101438052B (en) 2012-06-06

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