EP2529104A1 - Fuel injection system with integrated high-pressure accumulator - Google Patents

Fuel injection system with integrated high-pressure accumulator

Info

Publication number
EP2529104A1
EP2529104A1 EP10800951A EP10800951A EP2529104A1 EP 2529104 A1 EP2529104 A1 EP 2529104A1 EP 10800951 A EP10800951 A EP 10800951A EP 10800951 A EP10800951 A EP 10800951A EP 2529104 A1 EP2529104 A1 EP 2529104A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection system
distribution element
pressure
cylinder head
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
EP10800951A
Other languages
German (de)
French (fr)
Other versions
EP2529104B1 (en
Inventor
Friedrich Boecking
Sakae Sato
Sylvain Besancon
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 EP2529104A1 publication Critical patent/EP2529104A1/en
Application granted granted Critical
Publication of EP2529104B1 publication Critical patent/EP2529104B1/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
    • 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
    • F02M63/0265—Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/022—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type having an accumulator storing pressurised fuel during pumping stroke of the piston for subsequent delivery to the injector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

  • the invention relates to a fuel injection system of an internal combustion engine with a high pressure pump, wherein a high pressure outlet of the high pressure pump is connected to a high pressure accumulator having at least one storage outlet for connection to a fuel injector.
  • Such a fuel injection system is known from DE 10 2005 027 851 A1.
  • This fuel injection system with a high-pressure pump has two pump pistons driven by a camshaft, of which the fuel is conveyed via a respective check valve into a high-pressure accumulator arranged and mounted separately from the high-pressure pump. From the high-pressure accumulator, the fuel for injection into combustion chambers of the internal combustion engine by means of fuel injectors, which are connected via lines to the high pressure accumulator, taken.
  • the invention is based on the object to provide a fuel injection system, which is constructed compact and secure mounting.
  • the high pressure accumulator is adapted directly to the high pressure pump and that the accumulator outlet is aligned in a well-defined position relative to the high pressure pump.
  • the adaptation the high pressure accumulator to the high pressure pump has the advantage that it does not have to be mounted as a separate component and connected to the high pressure pump in a suitable manner.
  • the precise alignment of the storage outlet has the advantage that the connecting line to the fuel injector is precisely defined and to increase the mounting security no adjustment of the line is necessary.
  • the high-pressure pump has a pump housing with a cylinder head and the high-pressure outlet of the high-pressure pump opens into a cylinder head wall.
  • the mouth of the high-pressure outlet in a cylinder head wall enables the space-saving installation of the high-pressure accumulator directly on the cylinder head wall, for example, such that two cylinder units (possible but basically also the supply of one, three or four cylinder units) of the internal combustion engine can be operated by a high-pressure accumulator ,
  • the high pressure accumulator is designed as a cooperating with the high pressure outlet distribution element.
  • This distribution element is preferably in a high pressure pump used in the cylinder head of an internal combustion engine on a wall of the cylinder head of the
  • High pressure pump mounted and operated - as stated above - preferably two cylinder units of the internal combustion engine.
  • Such a distribution element with a cylindrical pot-like configuration is particularly suitable since it can be produced without problems and the cup-shaped interior offers a sufficiently large storage capacity for the high-pressure accumulator.
  • the distribution element may also be cylindrical-tube-shaped, in which case the at least one storage outlet is then attached laterally to the cylindrical tubular distribution element.
  • the distribution element has one, two, three or four storage outlets.
  • the storage outlets are preferably arranged at an angle deviating from 0 ° relative to the cylinder longitudinal axis thereof. This arrangement first enables the adaptation of more than one memory outlet at the distribution element, but on the other hand makes the exact alignment of the distribution element necessary in order to avoid the at least one connection. line to connect to the fuel injector without adjustment work.
  • the distribution element is fastened to the cylinder head wall by means of a holding part.
  • a holding part it would be possible to screw the distribution element, for example, provided with a thread directly to the cylinder head wall. Then, however, the alignment of the storage outlets would only be guaranteed by a precisely defined Anschraubgna.
  • the distribution element can be precisely aligned, for example by a corresponding mark (or an alignment device explained below) to the cylinder head and then secured by means of the holding member to the cylinder head wall.
  • the holding part is a clamping screw which is screwed, for example, with a threaded connector on the cylinder head.
  • the clamping screw on a retaining flange which rests on an annular flange of the distribution element.
  • the clamping screw can also be designed as a double-acting screw with a right-hand and a left-hand thread and cooperate with corresponding threads on the cylinder head and the distribution element.
  • the distribution element has an alignment device cooperating with the high-pressure outlet or the cylinder head, for example in the form of at least one nose, which cooperates with a corresponding recess.
  • the distribution element has a connection opening for a closure cover or a rail pressure sensor opposite the connection side on the high-pressure outlet or the cylinder head. This embodiment is particularly advantageous to apply when the distribution element is cylindrical tube-shaped.
  • FIG. 2 shows a detailed view of an alignment device of the distribution element
  • FIG. 4 is a sectional view of a cylinder tube-shaped distribution element
  • FIG. 5 shows a cross-sectional view through the cylinder tube-shaped distribution element according to FIG. 4.
  • the high-pressure pump of a fuel injection system of an internal combustion engine has a pump housing with a cylinder head 1, wherein a partially illustrated pump piston 2 is guided in a cylinder bore of the cylinder head 1 and the fuel is supplied from a pressure chamber 3 via a high-pressure outlet 4, into which a pressure-maintaining valve 5 is switched on, in a high-pressure accumulator 23 promotes.
  • the high pressure outlet 4 opens into a cylinder head wall 6 of the cylinder head 1 of the high pressure pump.
  • annular threaded connector 7 is formed, in which a cup-shaped distribution element 8, the interior of which forms the high-pressure accumulator 23, is used.
  • the high-pressure pump may be installed in a cylinder head of the internal combustion engine and then has no own drive shaft but is driven by a shaft of the internal combustion engine, for example, the camshaft. Alternatively, the high-pressure pump may also have its own drive shaft, which is driven by the internal combustion engine.
  • the cup-shaped distribution element 8 has an annular flange 9 on which a corresponding retaining flange 10 of a clamping screw 1 1 attacks. The clamping screw 1 1 is screwed to the threaded connector 7 and presses the distribution element 8 to the cylinder head wall 6 of the cylinder head 1 of the high-pressure pump. To grant a tight connection, the cup-shaped distribution element 8 has a sealing geometry 12 on the side facing the cylinder head wall 6. Alternatively, a seal is inserted between the corresponding components.
  • two storage outlets 13a, 13b in which lines for connection to fuel injectors can be screwed, are started in the bottom wall by way of example.
  • the number of accumulator outlets 13 (for example two, three or four) depends on the number of cylinders of the internal combustion engine, since each cylinder unit is assigned a fuel injector.
  • the distribution element still has a connection 14, to which a rail pressure sensor 15 can be connected. With the rail pressure sensor, the fuel pressure in the high-pressure accumulator 23 is determined to control the amount of fuel to be replenished.
  • Figure 2 shows the cup-shaped distribution element 8, which is provided with alignment means 16 in the form of three circumferentially distributed lugs. These lugs engage in corresponding recesses in the threaded connector 7 (or vice versa) and ensure accurate alignment of the distribution element 8 to the cylinder head wall 6.
  • the number of noses preferably corresponds to the
  • Number of memory outlets 13 to ensure accurate mapping and alignment.
  • two storage outlets 13 as well as the lugs are arranged opposite one another (180 °), while three storage outlets, as well as the lugs, are arranged at 120 ° and four storage outlets are rotated by 90 ° relative to one another.
  • the threaded connector 7a is integrated directly into the cylinder head 1 and the clamping screw 1 1 a is designed as a double-acting screw with a right and a left-hand thread.
  • the distribution element 8a here also has an external thread 17, so that when the tensioning screw 11a is screwed together, the distribution element 8a is bolted to the threaded connector 7 a.
  • the further embodiment of the distribution element 8a is analogous to FIG. 1.
  • the distribution element 8b has a cylindrical tube-shaped design and is screwed by means of a clamping screw 11b to a connecting piece 18 which cooperates with the cylinder head wall 6.
  • the nozzle 18 corresponds functionally to the threaded connector 7, 7a.
  • the clamping screw 1 1 b is supported on a clamping ring 19 which is inserted into a circumferential groove of the nozzle 18, and at the same time screwed into an internal thread of the distribution element 8 b.
  • An alignment device, not shown, and a sealing geometry are provided between the nozzle 18 and the distribution element 8b.
  • a closure lid 21 is screwed into a connection opening 20 of the distribution element 8b.
  • the rail pressure sensor can also be screwed in here.
  • the closure cover 21 screwed into the connection opening 20 has a recess 22 which causes a radial pressure to be exerted on the screw connection by the fuel pressure acting within the recess 22. This compensates for any expansion of the distribution element 8b and thus increases the effectiveness of the seal.
  • FIG. 5 shows, in a cross-sectional illustration, the distribution element 8b with, by way of example, two storage outlets 13a, 13b and a further connection 14 for the rail pressure sensor.
  • the number of actual accumulator outlets 13 (for example, two, three or four) depends on the number of cylinders of the internal combustion engine, since each cylinder unit is assigned to a fuel injector.

Landscapes

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

Abstract

The invention relates to a fuel injection system of an internal combustion engine, comprising a high-pressure pump. A high-pressure outlet (4) of the high-pressure pump is connected to a high-pressure accumulator (23) that has at least one accumulator outlet (13a, 13b) for connecting to a fuel injector. According to the invention, a fuel injection system which is compact and operates in a highly reliable manner is provided. This is achieved in that the high-pressure accumulator (23) is directly adapted to the high-pressure pump and in that the accumulator outlet (13a, 13b) is aligned in a precisely defined position with respect to the high-pressure pump.

Description

Beschreibung  description
Titel title
KRAFTSTOFFEINSPRITZSYSTEM MIT INTEGRIERTEM HOCHDRUCKSPEICHER  FUEL INJECTION SYSTEM WITH INTEGRATED HIGH-PRESSURE MEMORY
Technisches Gebiet Technical area
Die Erfindung betrifft ein Kraftstoffeinspritzsystem einer Brennkraftmaschine mit einer Hochdruckpumpe, wobei ein Hochdruckauslass der Hochdruckpumpe mit einem Hochdruckspeicher verschaltet ist, der zumindest einen Speicherauslass zur Verbindung mit einem Kraftstoffinjektor aufweist. The invention relates to a fuel injection system of an internal combustion engine with a high pressure pump, wherein a high pressure outlet of the high pressure pump is connected to a high pressure accumulator having at least one storage outlet for connection to a fuel injector.
Stand der Technik State of the art
Ein derartiges Kraftstoffeinspritzsystem ist aus der DE 10 2005 027 851 A1 bekannt. Dieses Kraftstoffeinspritzsystem mit einer Hochdruckpumpe weist zwei von einer Nockenwelle angetriebene Pumpenkolben auf, von denen der Kraftstoff über je ein Rückschlagventil in einen separat zu der Hochdruckpumpe angeordneten und montierten Hochdruckspeicher gefördert wird. Aus dem Hochdruckspeicher wird der Kraftstoff zur Einspritzung in Brennräume der Brennkraftmaschine mittels Kraftstoffinjektoren, die über Leitungen mit dem Hochdruckspeicher verbunden sind, entnommen. Such a fuel injection system is known from DE 10 2005 027 851 A1. This fuel injection system with a high-pressure pump has two pump pistons driven by a camshaft, of which the fuel is conveyed via a respective check valve into a high-pressure accumulator arranged and mounted separately from the high-pressure pump. From the high-pressure accumulator, the fuel for injection into combustion chambers of the internal combustion engine by means of fuel injectors, which are connected via lines to the high pressure accumulator, taken.
Der Erfindung liegt die Aufgabe zu Grunde ein Kraftstoffeinspritzsystem bereitzustellen, das kompakt und montagesicher aufgebaut ist. The invention is based on the object to provide a fuel injection system, which is constructed compact and secure mounting.
Offenbarung der Erfindung Disclosure of the invention
Diese Aufgabe wird dadurch gelöst, dass der Hochdruckspeicher direkt an die Hochdruckpumpe adaptiert ist und dass der Speicherauslass in einer genau definierten Stellung bezogen auf die Hochdruckpumpe ausgerichtet ist. Die Adaption des Hochdruckspeichers an die Hochdruckpumpe bietet den Vorteil, dass dieser nicht als separates Bauteil montiert und mit der Hochdruckpumpe in geeigneter Weise verbunden werden muss. Die genaue Ausrichtung des Speicherauslasses bietet den Vorteil, dass die Verbindungsleitung zu dem Kraftstoffinjektor genau definiert ist und zur Erhöhung der Montagesicherheit keine Anpassung der Leitung notwendig ist. This object is achieved in that the high pressure accumulator is adapted directly to the high pressure pump and that the accumulator outlet is aligned in a well-defined position relative to the high pressure pump. The adaptation the high pressure accumulator to the high pressure pump has the advantage that it does not have to be mounted as a separate component and connected to the high pressure pump in a suitable manner. The precise alignment of the storage outlet has the advantage that the connecting line to the fuel injector is precisely defined and to increase the mounting security no adjustment of the line is necessary.
In Weiterbildung der Erfindung weist die Hochdruckpumpe ein Pumpengehäuse mit einem Zylinderkopf auf und der Hochdruckauslass der Hochdruckpumpe mündet in eine Zylinderkopfwand. Die Mündung des Hochdruckauslasses in einer Zylinderkopfwand ermöglicht den platzsparenden Anbau des Hochdruckspeichers direkt an der Zylinderkopfwand beispielsweise so, dass von einem Hochdruckspeicher vorzugsweise zwei Zylindereinheiten (möglich ist aber grundsätzlich auch die Versorgung von einer, drei oder vier Zylindereinheiten) der Brenn- kraftmaschine bedient werden können. In a development of the invention, the high-pressure pump has a pump housing with a cylinder head and the high-pressure outlet of the high-pressure pump opens into a cylinder head wall. The mouth of the high-pressure outlet in a cylinder head wall enables the space-saving installation of the high-pressure accumulator directly on the cylinder head wall, for example, such that two cylinder units (possible but basically also the supply of one, three or four cylinder units) of the internal combustion engine can be operated by a high-pressure accumulator ,
In weiterer Ausgestaltung der Erfindung ist der Hochdruckspeicher als mit dem Hochdruckauslass zusammenwirkendes Verteilungselement ausgebildet. Dieses Verteilungselement ist bevorzugt bei einer in den Zylinderkopf einer Brennkraft- maschine eingesetzten Hochdruckpumpe an einer Wand des Zylinderkopfs derIn a further embodiment of the invention, the high pressure accumulator is designed as a cooperating with the high pressure outlet distribution element. This distribution element is preferably in a high pressure pump used in the cylinder head of an internal combustion engine on a wall of the cylinder head of the
Hochdruckpumpe montiert und bedient - wie zuvor ausgeführt - bevorzugt zwei Zylindereinheiten der Brennkraftmaschine. Ein solches Verteilungselement mit einer zylinderförmigen topfähnlichen Ausgestaltung ist besonders geeignet, da es problemlos hergestellt werden kann und der topfförmige Innenraum eine genü- gend große Speicherkapazität für den Hochdruckspeicher bietet. In alternativerHigh pressure pump mounted and operated - as stated above - preferably two cylinder units of the internal combustion engine. Such a distribution element with a cylindrical pot-like configuration is particularly suitable since it can be produced without problems and the cup-shaped interior offers a sufficiently large storage capacity for the high-pressure accumulator. In alternative
Ausgestaltung kann das Verteilungselement auch zylinderrohrförmig ausgebildet sein, wobei dann der zumindest eine Speicherausgang seitlich an dem zylinder- rohrförmigen Verteilungselement angebracht ist. In Weiterbildung der Erfindung weist das Verteilungselement einen, zwei, drei oder vier Speicherauslässe auf. Dabei sind die Speicherauslässe bevorzugt unter einem von 0° abweichenden Winkel zu dessen Zylinderlängsachse angeordnet. Diese Anordnung ermöglicht erst die Adaption von mehr als einem Speicheraus- lass an dem Verteilungselement, macht aber andererseits die genaue Ausrich- tung des Verteilungselementes notwendig, um die zumindest eine Verbindungs- leitung zu dem Kraftstoffinjektor ohne Anpassungsarbeiten anschließen zu können. Embodiment, the distribution element may also be cylindrical-tube-shaped, in which case the at least one storage outlet is then attached laterally to the cylindrical tubular distribution element. In a development of the invention, the distribution element has one, two, three or four storage outlets. In this case, the storage outlets are preferably arranged at an angle deviating from 0 ° relative to the cylinder longitudinal axis thereof. This arrangement first enables the adaptation of more than one memory outlet at the distribution element, but on the other hand makes the exact alignment of the distribution element necessary in order to avoid the at least one connection. line to connect to the fuel injector without adjustment work.
In Weiterbildung der Erfindung ist das Verteilungselement mittels eines Halteteils an der Zylinderkopfwand befestigt. Grundsätzlich wäre es möglich, dass Verteilungselement beispielsweise mit einem Gewinde versehen direkt an der Zylinderkopfwand anzuschrauben. Dann wäre aber die Ausrichtung der Speicherauslässe nur durch eine genau definierte Anschraubstellung gewährleistet. Durch die Verwendung eines Halteteils kann das Verteilungselement genau beispielsweise durch eine entsprechende Markierung (oder einer nachfolgend erläuterten Ausrichtungseinrichtung) zu dem Zylinderkopf ausgerichtet werden und dann mittels des Halteteils an der Zylinderkopfwand befestigt werden. In a development of the invention, the distribution element is fastened to the cylinder head wall by means of a holding part. In principle, it would be possible to screw the distribution element, for example, provided with a thread directly to the cylinder head wall. Then, however, the alignment of the storage outlets would only be guaranteed by a precisely defined Anschraubstellung. Through the use of a holding part, the distribution element can be precisely aligned, for example by a corresponding mark (or an alignment device explained below) to the cylinder head and then secured by means of the holding member to the cylinder head wall.
In weiterer Ausgestaltung ist das Halteteil eine Spannschraube, die beispielsweise mit einem Gewindestutzen an dem Zylinderkopf verschraubt wird. Dabei weist die Spannschraube einen Halteflansch auf, der auf einem Ringflansch des Verteilungselements aufliegt. Alternativ kann die Spannschraube aber auch als doppelwirkende Schraube mit einem Rechts- und einem Linksgewinde ausgebildet sein und mit entsprechenden Gewinden an dem Zylinderkopf und dem Verteilungselement zusammenwirken. In a further embodiment, the holding part is a clamping screw which is screwed, for example, with a threaded connector on the cylinder head. In this case, the clamping screw on a retaining flange which rests on an annular flange of the distribution element. Alternatively, the clamping screw can also be designed as a double-acting screw with a right-hand and a left-hand thread and cooperate with corresponding threads on the cylinder head and the distribution element.
In Weiterbildung der Erfindung weist das Verteilungselement eine mit dem Hoch- druckauslass oder dem Zylinderkopf zusammenwirkende Ausrichtungseinrichtung beispielsweise in Form von zumindest einer Nase, die mit einer korrespon- dierenden Ausnehmung zusammenwirkt, auf. Dadurch ist dann ohne weitere optische Ausrichtung direkt genau die notwendige Ausrichtung erreicht. In a development of the invention, the distribution element has an alignment device cooperating with the high-pressure outlet or the cylinder head, for example in the form of at least one nose, which cooperates with a corresponding recess. As a result, exactly the necessary alignment is achieved directly without further optical alignment.
In weiterer Ausgestaltung weist das Verteilungselement gegenüberliegend zu der Anschlussseite an dem Hochdruckauslass oder dem Zylinderkopf eine An- schlussöffnung für einen Verschlussdeckel oder einen Raildrucksensor auf. Diese Ausgestaltung ist insbesondere dann vorteilhaft anzuwenden, wenn das Verteilungselement zylinderrohrförmig ausgebildet ist. In a further refinement, the distribution element has a connection opening for a closure cover or a rail pressure sensor opposite the connection side on the high-pressure outlet or the cylinder head. This embodiment is particularly advantageous to apply when the distribution element is cylindrical tube-shaped.
Kurzbeschreibung der Zeichnungen Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der in den Figuren dargestellte Ausführungsbeispiele der Erfindung näher beschrieben sind. Es zeigen: Brief description of the drawings Further advantageous embodiments of the invention are described in the drawings, are described in more detail in the embodiments illustrated in the figures of the invention. Show it:
Figur 1 eine Schnittdarstellung eines topfförmig ausgebildeten Verteilungselements, 1 shows a sectional view of a cup-shaped distribution element,
Figur 2 eine Detailansicht einer Ausrichtungseinrichtung des Verteilungselements, FIG. 2 shows a detailed view of an alignment device of the distribution element,
Figur 3 eine Variante der Befestigung des Verteilungselements an dem Zylinderkopf, 3 shows a variant of the attachment of the distribution element to the cylinder head,
Figur 4 eine Schnittdarstellung eines zylinderrohrförmig ausgebildeten Verteilungselements, FIG. 4 is a sectional view of a cylinder tube-shaped distribution element,
Figur 5 eine Querschnittdarstellung durch das zylinderrohrförmig ausgebildete Verteilungselement gemäß Figur 4. FIG. 5 shows a cross-sectional view through the cylinder tube-shaped distribution element according to FIG. 4.
Ausführungsform der Erfindung Embodiment of the invention
Ausweislich der Figur 1 weist die Hochdruckpumpe eines Kraftstoffeinspritzsystems einer Brennkraftmaschine ein Pumpengehäuse mit einem Zylinderkopf 1 auf, wobei ein teilweise dargestellter Pumpenkolben 2 in einer Zylinderbohrung des Zylinderkopfs 1 geführt ist und den Kraftstoff von einem Druckraum 3 über einen Hochdruckauslass 4, in den ein Druckhalteventil 5 eingeschaltet ist, in einen Hochdruckspeicher 23 fördert. Der Hochdruckauslass 4 mündet in eine Zylinderkopfwand 6 des Zylinderkopfs 1 der Hochdruckpumpe. An die Zylinderkopfwand 6 ist ein ringförmiger Gewindestutzen 7 angeformt, in den ein topfförmig ausgebildetes Verteilungselement 8, dessen Innenraum den Hochdruckspeicher 23 bildet, eingesetzt ist. Die Hochdruckpumpe kann in einen Zylinderkopf der Brennkraftmaschine eingebaut sein und weist dann keine eigene Antriebswelle auf sondern wird durch eine Welle der Brennkraftmaschine angetrieben, beispielsweise deren Nockenwelle. Alternativ kann die Hochdruckpumpe auch eine eigene Antriebswelle aufweisen, die durch die Brennkraftmaschine angetrieben wird. Das topfförmige Verteilungselement 8 weist einen Ringflansch 9 auf an dem ein korrespondierender Halteflansch 10 einer Spannschraube 1 1 angreift. Die Spannschraube 1 1 ist mit dem Gewindestutzen 7 verschraubt und presst das Verteilungselement 8 an die Zylinderkopfwand 6 des Zylinderkopfs 1 der Hochdruckpumpe. Zur Gewährung einer dichten Verbindung weist das topfförmige Verteilungselement 8 auf der der Zylinderkopfwand 6 zugewandten Seite eine Dichtgeometrie 12 auf. Alternativ ist zwischen die korrespondierenden Bauteile eine Dichtung eingesetzt. As shown in FIG. 1, the high-pressure pump of a fuel injection system of an internal combustion engine has a pump housing with a cylinder head 1, wherein a partially illustrated pump piston 2 is guided in a cylinder bore of the cylinder head 1 and the fuel is supplied from a pressure chamber 3 via a high-pressure outlet 4, into which a pressure-maintaining valve 5 is switched on, in a high-pressure accumulator 23 promotes. The high pressure outlet 4 opens into a cylinder head wall 6 of the cylinder head 1 of the high pressure pump. To the cylinder head wall 6, an annular threaded connector 7 is formed, in which a cup-shaped distribution element 8, the interior of which forms the high-pressure accumulator 23, is used. The high-pressure pump may be installed in a cylinder head of the internal combustion engine and then has no own drive shaft but is driven by a shaft of the internal combustion engine, for example, the camshaft. Alternatively, the high-pressure pump may also have its own drive shaft, which is driven by the internal combustion engine. The cup-shaped distribution element 8 has an annular flange 9 on which a corresponding retaining flange 10 of a clamping screw 1 1 attacks. The clamping screw 1 1 is screwed to the threaded connector 7 and presses the distribution element 8 to the cylinder head wall 6 of the cylinder head 1 of the high-pressure pump. To grant a tight connection, the cup-shaped distribution element 8 has a sealing geometry 12 on the side facing the cylinder head wall 6. Alternatively, a seal is inserted between the corresponding components.
Auf der gegenüberliegenden Seite des Verteilungselements 8 sind in die Bodenwand beispielhaft zwei Speicherauslässe 13a, 13b angelassen, an denen Leitungen zur Verbindung mit Kraftstoffinjektoren anschraubbar sind. Die Anzahl der Speicherauslässe 13 (beispielweise zwei, drei oder vier) hängt von der Zylinder- zahl der Brennkraftmaschine ab, da jeder Zylindereinheit ein Kraftstoffinjektor zugeordnet ist. Schließlich weist das Verteilungselement noch einen Anschluss 14 auf, an den ein Raildrucksensor 15 anschließbar ist. Mit dem Raildrucksensor wird der Kraftstoffdruck in dem Hochdruckspeicher 23 zur Steuerung der nachzufüllenden Kraftstoff menge ermittelt. On the opposite side of the distribution element 8, two storage outlets 13a, 13b, in which lines for connection to fuel injectors can be screwed, are started in the bottom wall by way of example. The number of accumulator outlets 13 (for example two, three or four) depends on the number of cylinders of the internal combustion engine, since each cylinder unit is assigned a fuel injector. Finally, the distribution element still has a connection 14, to which a rail pressure sensor 15 can be connected. With the rail pressure sensor, the fuel pressure in the high-pressure accumulator 23 is determined to control the amount of fuel to be replenished.
Figur 2 zeigt das topfförmige Verteilungselement 8, das mit Ausrichtungseinrichtungen 16 in Form von drei auf den Umfang verteilter Nasen versehen ist. Diese Nasen greifen in entsprechende Ausnehmungen in den Gewindestutzen 7 (oder umgekehrt) ein und stellen eine genaue Ausrichtung des Verteilungselements 8 zu der Zylinderkopfwand 6 sicher. Die Anzahl der Nasen entspricht bevorzugt derFigure 2 shows the cup-shaped distribution element 8, which is provided with alignment means 16 in the form of three circumferentially distributed lugs. These lugs engage in corresponding recesses in the threaded connector 7 (or vice versa) and ensure accurate alignment of the distribution element 8 to the cylinder head wall 6. The number of noses preferably corresponds to the
Anzahl der Speicherauslässe 13, um eine genaue Zuordnung und Ausrichtung zu gewährleisten. Beispielhaft sind zwei Speicherauslässe 13 ebenso wie die Nasen gegenüberliegend (180°) angeordnet, während drei Speicherauslässe ebenso wie die Nasen um 120° und vier Speicherauslässe um 90° verdreht zueinander angeordnet sind. Number of memory outlets 13 to ensure accurate mapping and alignment. By way of example, two storage outlets 13 as well as the lugs are arranged opposite one another (180 °), while three storage outlets, as well as the lugs, are arranged at 120 ° and four storage outlets are rotated by 90 ° relative to one another.
In dem Ausführungsbeispiel gemäß Figur 3 ist der Gewindestutzen 7a direkt in den Zylinderkopf 1 integriert und die Spannschraube 1 1 a ist als doppelwirkende Schraube mit einem Rechts- und einem Linksgewinde ausgestaltet. Dement- sprechend weist auch das Verteilungselement 8a hier ein Außengewinde 17 auf, so dass beim Verschrauben der Spannschraube 1 1 a das Verteilungselement 8a mit dem Gewindestutzen 7 a verschraubt wird. Die weitere Ausgestaltung des Verteilungselements 8a ist analog zu der Figur 1 . In the embodiment shown in Figure 3, the threaded connector 7a is integrated directly into the cylinder head 1 and the clamping screw 1 1 a is designed as a double-acting screw with a right and a left-hand thread. Correspondingly, the distribution element 8a here also has an external thread 17, so that when the tensioning screw 11a is screwed together, the distribution element 8a is bolted to the threaded connector 7 a. The further embodiment of the distribution element 8a is analogous to FIG. 1.
Bei dem Ausführungsbeispiel nach Figur 4 ist das Verteilungselement 8b zylin- derrohrförmig ausgebildet und mit einem Stutzen 18, der mit der Zylinderkopfwand 6 zusammenwirkt, mittels einer Spannschraube 1 1 b verschraubt. Der Stutzen 18 entspricht funktionell den Gewindestutzen 7, 7a. Die Spannschraube 1 1 b stützt sich an einen Spannring 19, der in eine umlaufende Nut des Stutzens 18 eingesetzt ist, ab und ist gleichzeitig in ein Innengewinde des Verteilungselements 8b eingeschraubt. Eine nicht dargestellte Ausrichtungseinrichtung und eine Dichtgeometrie sind zwischen dem Stutzen 18 und dem Verteilungselement 8b vorgesehen. In the embodiment according to FIG. 4, the distribution element 8b has a cylindrical tube-shaped design and is screwed by means of a clamping screw 11b to a connecting piece 18 which cooperates with the cylinder head wall 6. The nozzle 18 corresponds functionally to the threaded connector 7, 7a. The clamping screw 1 1 b is supported on a clamping ring 19 which is inserted into a circumferential groove of the nozzle 18, and at the same time screwed into an internal thread of the distribution element 8 b. An alignment device, not shown, and a sealing geometry are provided between the nozzle 18 and the distribution element 8b.
Gegenüberliegend zu dem Stutzen 18 ist in eine Anschlussöffnung 20 des Verteilungselements 8b ein Verschlussdeckel 21 eingeschraubt. Alternativ kann hier auch der Raildrucksensor eingeschraubt werden. Der in die Anschlussöffnung 20 eingeschraubte Verschlussdeckel 21 weist eine Ausnehmung 22 auf, die bewirkt, dass durch den innerhalb der Ausnehmung 22 wirkenden Kraftstoffdruck ein Radialdruck auf die Schraubverbindung ausgeübt wird. Dadurch wird eine eventuelle Aufweitung des Verteilungselements 8b kompensiert und so die Wirksamkeit der Abdichtung erhöht. Opposite to the neck 18, a closure lid 21 is screwed into a connection opening 20 of the distribution element 8b. Alternatively, the rail pressure sensor can also be screwed in here. The closure cover 21 screwed into the connection opening 20 has a recess 22 which causes a radial pressure to be exerted on the screw connection by the fuel pressure acting within the recess 22. This compensates for any expansion of the distribution element 8b and thus increases the effectiveness of the seal.
Figur 5 zeigt in einer Querschnittdarstellung das Verteilungselement 8b mit beispielhaft zwei Speicherauslässen 13a, 13b und einen weiteren Anschluss 14 für den Raildrucksensor. Auch hier hängt die Anzahl der tatsächlichen Speicherauslässe 13 (beispielweise zwei, drei oder vier) von der Zylinderzahl der Brennkraftmaschine ab, da jeder Zylindereinheit ein Kraftstoff injektor zugeordnet ist. FIG. 5 shows, in a cross-sectional illustration, the distribution element 8b with, by way of example, two storage outlets 13a, 13b and a further connection 14 for the rail pressure sensor. Again, the number of actual accumulator outlets 13 (for example, two, three or four) depends on the number of cylinders of the internal combustion engine, since each cylinder unit is assigned to a fuel injector.

Claims

Ansprüche claims
1 . Kraftstoffeinspritzsystem einer Brennkraftmaschine mit einer Hochdruckpumpe, wobei ein Hochdruckauslass (4) der Hochdruckpumpe mit einem Hochdruckspeicher (23) verschaltet ist, der zumindest einen Speicherauslass (13a, 13b) zur Verbindung mit einem Kraftstoffinjektor aufweist, 1 . A fuel injection system of an internal combustion engine having a high-pressure pump, wherein a high-pressure outlet (4) of the high-pressure pump is connected to a high-pressure accumulator (23) which has at least one accumulator outlet (13a, 13b) for connection to a fuel injector,
dadurch gekennzeichnet, dass der Hochdruckspeicher (23) direkt an die Hochdruckpumpe adaptiert ist und dass der Speicherauslass (13a, 13b) in einer genau definierten Stellung bezogen auf die Hochdruckpumpe ausgerichtet ist. characterized in that the high pressure accumulator (23) is adapted directly to the high pressure pump and that the accumulator outlet (13a, 13b) is oriented in a precisely defined position relative to the high pressure pump.
2. Kraftstoffeinspritzsystem nach Anspruch 1 , 2. Fuel injection system according to claim 1,
dadurch gekennzeichnet, dass die Hochdruckpumpe ein Pumpengehäuse mit einem Zylinderkopf (1 ) aufweist und dass der Hochdruckauslass (4) in eine Zylinderkopfwand (6) des Zylinderkopfs (1 ) mündet. characterized in that the high-pressure pump has a pump housing with a cylinder head (1) and that the high-pressure outlet (4) opens into a cylinder head wall (6) of the cylinder head (1).
3. Kraftstoffeinspritzsystem nach Anspruch 1 oder 2, 3. Fuel injection system according to claim 1 or 2,
dadurch gekennzeichnet, dass der Hochdruckspeicher (23) als mit dem Hochdruckauslass (4) zusammenwirkendes Verteilungselement (8, 8a) ausgebildet ist. characterized in that the high pressure accumulator (23) as with the high pressure outlet (4) cooperating distribution element (8, 8a) is formed.
4. Kraftstoffeinspritzsystem nach Anspruch 3, 4. Fuel injection system according to claim 3,
dadurch gekennzeichnet, dass das Verteilungselement (8b) zylinderrohrförmig ausgebildet ist. characterized in that the distribution element (8b) is cylindrical tube-shaped.
5. Kraftstoffeinspritzsystem nach Anspruch 3 oder 4, 5. Fuel injection system according to claim 3 or 4,
dadurch gekennzeichnet, dass das Verteilungselement (8) zwei, drei oder vier Speicherauslässe (13) aufweist. characterized in that the distribution element (8) has two, three or four storage outlets (13).
6. Kraftstoffeinspritzsystem nach einem der Ansprüche 3 bis 5, 6. Fuel injection system according to one of claims 3 to 5,
dadurch gekennzeichnet, dass das Verteilungselement (8, 8a, 8b) mittels eines Halteteils an der Zylinderkopfwand (6) befestigt ist. characterized in that the distribution element (8, 8a, 8b) is fixed by means of a holding part on the cylinder head wall (6).
7. Kraftstoffeinspritzsystem nach Anspruch 6, 7. Fuel injection system according to claim 6,
dadurch gekennzeichnet, dass das Halteteil eine Spannschraube (1 1 , 1 1 a, 1 1 b) ist. characterized in that the holding part is a clamping screw (1 1, 1 1 a, 1 1 b).
8. Kraftstoffeinspritzsystem nach einem der Ansprüche 3 bis 7, 8. Fuel injection system according to one of claims 3 to 7,
dadurch gekennzeichnet, dass das Verteilungselement (8, 8a, 8b) eine mit dem Hochdruckauslass (4) oder Zylinderkopf (1 ) zusammenwirkende Ausrichtungseinrichtung (16) aufweist. characterized in that the distribution element (8, 8a, 8b) has an alignment with the high-pressure outlet (4) or cylinder head (1) alignment means (16).
9. Kraftstoffeinspritzsystem nach einem der Ansprüche 3 bis 8, 9. Fuel injection system according to one of claims 3 to 8,
dadurch gekennzeichnet, dass das Verteilungselement (8b) gegenüberliegend zu der Anschlussseite an dem Hochdruckauslass (4) oder dem Zylinderkopf (1 ) eine Anschlussöffnung (20) für einen Verschlussdeckel (21 ) oder einen Raild- rucksensor (15) aufweist. characterized in that the distribution element (8b) opposite to the connection side on the high-pressure outlet (4) or the cylinder head (1) has a connection opening (20) for a closure cover (21) or a rail sensor (15).
EP10800951.5A 2010-01-27 2010-12-29 Fuel injection system with integrated high-pressure accumulator Active EP2529104B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010001252A DE102010001252A1 (en) 2010-01-27 2010-01-27 Fuel injection system with integrated high-pressure accumulator on a cylinder head
PCT/EP2010/070871 WO2011091937A1 (en) 2010-01-27 2010-12-29 Fuel injection system with integrated high-pressure accumulator

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EP2529104A1 true EP2529104A1 (en) 2012-12-05
EP2529104B1 EP2529104B1 (en) 2014-08-06

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EP (1) EP2529104B1 (en)
JP (1) JP5491643B2 (en)
KR (1) KR101835894B1 (en)
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RU2012136542A (en) 2014-03-10
KR101835894B1 (en) 2018-03-07
EP2529104B1 (en) 2014-08-06
JP2013518209A (en) 2013-05-20
RU2568024C2 (en) 2015-11-10
JP5491643B2 (en) 2014-05-14
US9068543B2 (en) 2015-06-30
CN102770659B (en) 2015-05-20
CN102770659A (en) 2012-11-07
DE102010001252A1 (en) 2011-07-28
US20120279473A1 (en) 2012-11-08
KR20120112655A (en) 2012-10-11
WO2011091937A1 (en) 2011-08-04

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