EP1398496A2 - High-pressure pipe for fuel injection systems of internal combustion engine - Google Patents

High-pressure pipe for fuel injection systems of internal combustion engine Download PDF

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Publication number
EP1398496A2
EP1398496A2 EP03008432A EP03008432A EP1398496A2 EP 1398496 A2 EP1398496 A2 EP 1398496A2 EP 03008432 A EP03008432 A EP 03008432A EP 03008432 A EP03008432 A EP 03008432A EP 1398496 A2 EP1398496 A2 EP 1398496A2
Authority
EP
European Patent Office
Prior art keywords
pressure line
pressure
constriction
fuel injection
rail
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.)
Withdrawn
Application number
EP03008432A
Other languages
German (de)
French (fr)
Other versions
EP1398496A3 (en
Inventor
Peter Grabert
Ralf Dohms
Oksana Fuetterer
Helmar Alber
Michael Haug
Wolfgang Leuchtenmueller
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 EP1398496A2 publication Critical patent/EP1398496A2/en
Publication of EP1398496A3 publication Critical patent/EP1398496A3/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/0245—Means for varying pressure in common rails by bleeding fuel pressure between the high pressure pump and the common rail
    • 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
    • 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
    • F02M59/04—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 characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—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 characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • 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
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/025—Means for varying pressure in common rails by bleeding fuel pressure from the common rail
    • 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
    • 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

Definitions

  • the High pressure line for a Fuel injection system of internal combustion engines has the High pressure line at least one constriction, so that the desired cross-sectional constriction without additional Components and achieved with very low production costs becomes.
  • the constriction is fluidic cheaper than an inserted disc, which a has sudden cross-sectional constriction result.
  • the at least one constriction by forming in particular by rolling or rolling or by Squeezing is made. All these procedures are good to master production technology and allow that Introducing a constriction in a high-pressure line, the usually made of a ductile material, in particular Metal, exists. Depending on whether a circular Cross-sectional area in the area of the constriction or a Rectangular cross-sectional area is sought either the constriction by rolling or rolling or be made by squeezing.
  • the high pressure line between two Rails be arranged. This is especially beneficial if a fuel injection system with two rails, like it For example, is used in V8 engines, is provided. Also can the high-pressure line according to the invention between a Pump and a nozzle in a pump-line-nozzle fuel injection system be used.
  • Fig. 1 is a block diagram of a rail fuel injection system with a radial piston pump 1 represented, representing other types of construction Explanation of the high pressure line of the invention is used. However, the invention is not on such fuel injection systems limited, but can be used wherever advantageous where unwanted Pressure pulsations occur in high-pressure systems, especially in other fuel injection systems, such.
  • the radial piston pump 1 has a suction side 3 and a (High) -Printseite 5, which has a check valve 7 with a rail 9 is in communication.
  • the check valve 7 and the rail 9 are through a first high-pressure line. 8 hydraulically connected.
  • the fuel return 13 opens into the suction side 3 of Radial piston pump 1.
  • the suction side 3 is of one here Not shown fuel tank supplied with fuel.
  • a quantity control valve 15 is provided between the pressure side 5 and fuel return 13, the in turn hydraulically connected to the suction side 3 is, a quantity control valve 15 is provided. If that Volume control valve 15, as shown in Fig. 1, opened is, on the pressure side 5 of the radial piston pump 1 no Pressure build-up take place as a hydraulic connection over the fuel return 13 with the suction side 3 is. In this state, the radial piston pump 1 promotes none Fuel in the rail 9, because the pressure in the rail 9 very much higher than the pressure on the suction side 3 of Radial piston pump 1 is.
  • the quantity control valve 15 When the quantity control valve 15 is closed, the hydraulic connection between the suction side 3 and pressure side 5 is interrupted via the fuel return 13, so that a pressure build-up in the pump elements 17 of the radial piston pump 1 can take place. In this state, the radial piston pump 1 promotes fuel into the rail 9 as soon as the pressure built up by the pump elements 17 is greater than the pressure prevailing in the rail 9 pressure. Due to the non-steady promotion of the pump elements 17, by switching operations of the quantity control valve 15, the pressure control valve 11 or other transient processes can lead to undesirable pressure pulsations in the high pressure region of the fuel injection system.
  • the rail 9 is hydraulically connected by further high-pressure lines 19 with injectors 21 which inject the fuel into the combustion chambers or intake ports, not shown, of an internal combustion engine, not shown.
  • the second High-pressure line 10 or the high-pressure lines 19 can the mentioned pressure pulsations reduced or even be completely suppressed.
  • FIG. 2 shows a high-pressure line 23 according to the invention in longitudinal section and in cross section along the section line A-A shown.
  • the high-pressure line 23 according to the invention has, like other lines also, an inner diameter 25th and an outer diameter 27.
  • the inventive High pressure line 23 has a cylindrical cross section. in the Area of the section line A-A has the high pressure line 23rd a constriction 29 on. This constriction 29 is at the first embodiment shown in FIG. 2 by rotating roller burnishing tools 31 produced.
  • the Burnishing tools 31 rotate about their axis of rotation 33.
  • the high pressure line 23 is rotated.
  • the Rotary axes 33 and thus the rolling tools 31 are as long moved towards each other until the desired Constriction 29 made in the high pressure line 23 has been. It must be ensured that the Inner diameter of the high-pressure line 23 according to the invention in the area of constriction 29 not complete is closed.
  • Fig. 2 is a cross section through the first Embodiment of an inventive High pressure line 23 along the section line A-A shown.
  • Fig. 3 is a second embodiment of a High pressure line 23 according to the invention also in Longitudinal section and in cross section along the section line A-A shown. Same components are the same Reference numeral provided and it applies with respect to FIG. 2 Said accordingly.
  • the constriction 29 is not rotationally symmetrical, but the Constriction 29 is by squeezing the high pressure line 23rd been prepared. Consequently, the cross section is in Area of the constriction 29 not rotationally symmetric, but has two flats 35.
  • the constriction 29 is also very simple and inexpensive and also causes the desired narrowing of the Flow cross section of the high pressure line 23 in the area the constriction 29.

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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)
  • Pipe Accessories (AREA)

Abstract

The high pressure line (23) has at least one constriction (29) that is produced by shaping the line. The constriction can be produced by rolling or crushing. and is preferably arranged at one end of the high pressure line. The high pressure line is arranged in the high pressure region of a fuel injection system, e.g. between a high pressure fuel pump and a rail.

Description

Stand der TechnikState of the art

Im Hochdruckbereich von Kraftstoffeinspritzsystemen, insbesondere bei Rail-Kraftstoffeinspritzsystemen kann es unter speziellen Betriebsbedingungen zu Druckpulsationen kommen, die das Einspritzverhalten des Kraftstoffeinspritzsystems negativ beeinflussen. Die Druckpulsationen entstehen durch die Elastizität der den Kraftstoff umgebenden Bauteile, insbesondere der Hochdruckleitungen und die Kompressibilität des Kraftstoffs. Das Entstehen dieser Druckpulsationen kann vermieden werden, wenn die Strömungsgeschwindigkeit des mit Druckpulsationen beaufschlagten Kraftstoffs erhöht wird. Dies kann durch eine Verengung des Strömungsquerschnitts erreicht werden. Bei Rail-Kraftstoffeinspritzsystemen bietet es sich an, zwischen Kraftstoffhochdruckpumpe und Rail eine solche Verengung des Strömungsquerschnittes vorzusehen. In the high pressure area of fuel injection systems, especially with rail fuel injection systems it can under special operating conditions to pressure pulsations come, the injection behavior of the Negatively affect the fuel injection system. The Pressure pulsations are caused by the elasticity of the Fuel surrounding components, in particular the High pressure pipes and the compressibility of the Fuel. The emergence of these pressure pulsations can be avoided if the flow rate of with Pressure pulsations applied fuel is increased. This can be achieved by narrowing the flow cross section be achieved. In rail fuel injection systems It makes sense between high-pressure fuel pump and Rail such a narrowing of the flow cross-section provided.

Bei bekannten Rail-Kraftstoffeinspritzsystemen wird deshalb unter einen eingeschraubten Hochdruckanschlussstutzen in der Kraftstoffhochdruckpumpe eine Scheibe eingelegt, die eine Mittenbohrung von etwa 0,65 mm Durchmesser hat. Diese kleine Bohrung stellt eine Verengung des Strömungsquerschnitts in der Hochdruckleitung dar und bewirkt die gewünschte Strömungsbeschleunigung.Therefore, in known rail fuel injection systems under a screwed-in high-pressure connector in the high-pressure fuel pump inserted a disc, the has a center hole of about 0.65 mm in diameter. This small hole represents a narrowing of the Flow cross section in the high pressure line and causes the desired flow acceleration.

Vorteile der ErfindungAdvantages of the invention

Bei der erfindungsgemäßen Hochdruckleitung für ein Kraftstoffeinspritzsystem von Brennkraftmaschinen weist die Hochdruckleitung mindestens eine Einschnürung auf, so dass die gewünschte Querschnittsverengung ohne zusätzliche Bauteile und mit sehr geringen Herstellungskosten erzielt wird. Außerdem ist die Einschnürung strömungstechnisch günstiger als eine eingelegte Scheibe, welche eine sprunghafte Querschnittsverengung zur Folge hat.In the inventive high-pressure line for a Fuel injection system of internal combustion engines has the High pressure line at least one constriction, so that the desired cross-sectional constriction without additional Components and achieved with very low production costs becomes. In addition, the constriction is fluidic cheaper than an inserted disc, which a has sudden cross-sectional constriction result.

Durch den Wegfall der Scheibe werden nicht nur Herstellungskosten eingespart, sondern es wird auch die Montage des Kraftstoffeinspritzsystems erleichtert und eine Fehlerquelle - Weglassen der Scheibe - eliminiert.By eliminating the disc will not only Saves manufacturing costs, but it is also the Facilitates assembly of the fuel injection system and a Error source - Disc omission - eliminated.

Weitere vorteilhafte Varianten der Erfindung sehen vor, dass die mindestens eine Einschnürung durch Umformen, insbesondere durch Rollieren oder Walzen oder durch Quetschen hergestellt wird. Alle genannten Verfahren sind fertigungstechnisch gut zu beherrschen und erlauben das Einbringen einer Einschnürung in eine Hochdruckleitung, die üblicherweise aus einem duktilen Material, insbesondere Metall, besteht. Je nachdem, ob eine kreisförmige Querschnittsfläche im Bereich der Einschnürung oder eine rechteckige Querschnittsfläche angestrebt wird, kann entweder die Einschnürung durch Rollieren oder Walzen oder durch Quetschen hergestellt werden.Further advantageous variants of the invention provide that the at least one constriction by forming, in particular by rolling or rolling or by Squeezing is made. All these procedures are good to master production technology and allow that Introducing a constriction in a high-pressure line, the usually made of a ductile material, in particular Metal, exists. Depending on whether a circular Cross-sectional area in the area of the constriction or a Rectangular cross-sectional area is sought either the constriction by rolling or rolling or be made by squeezing.

Es hat sich als vorteilhaft erwiesen, wenn die mindestens eine Einschnürung an einem Ende der Hochdruckleitung angebracht wird. Sowohl unter strömungstechnischen als auch unter fertigungstechnischen Gesichtspunkten ist dieser Ort günstig für die Einschnürung.It has proven to be advantageous if the at least a constriction at one end of the high pressure line is attached. Both under fluidic as well from a manufacturing point of view is this place favorable for the constriction.

Es hat sich als vorteilhaft herausgestellt, wenn die erfindungsgemäße Hochdruckleitung zwischen einer Kraftstoffhochdruckpumpe und einem Rail angeordnet ist oder die Hochdruckleitung zwischen einem Rail und einem Injektor angeordnet ist.It has proved to be advantageous if the High-pressure line according to the invention between a High-pressure fuel pump and a rail is arranged or the high pressure line between a rail and an injector is arranged.

Alternativ kann die Hochdruckleitung auch zwischen zwei Rails angeordnet sein. Dies ist besonders dann von Vorteil, wenn ein Kraftstoffeinspritzsystem mit zwei Rails, wie es bspw. bei V8-Motoren eingesetzt wird, vorgesehen ist. Auch kann die erfindungsgemäße Hochdruckleitung zwischen einer Pumpe und einer Düse in einem Pumpe-Leitung-Düse-Kraftstoffeinspritzsystem eingesetzt werden.Alternatively, the high pressure line between two Rails be arranged. This is especially beneficial if a fuel injection system with two rails, like it For example, is used in V8 engines, is provided. Also can the high-pressure line according to the invention between a Pump and a nozzle in a pump-line-nozzle fuel injection system be used.

Bei allen diesen Anwendungen konnte die Wirksamkeit der erfindungsgemäßen Hochdruckleitung bezüglich der Dämpfung bzw. der Eliminierung von unerwünschten Druckpulsationen nachgewiesen werden.In all these applications, the effectiveness of the High pressure line according to the invention with respect to the damping or the elimination of undesired pressure pulsations be detected.

Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Zeichnung, deren Beschreibung und den Patentansprüchen entnehmbar.Further advantages and advantageous embodiments of Invention are the following drawings, whose Description and claims removed.

Zeichnungdrawing

Es zeigen:

Fig. 1:
ein Schaltbild eines Kraftstoffeinspritzsystems;
Fig. 2:
ein erstes Ausführungsbeispiel einer erfindungsgemäßen Hochdruckleitung im Längs- und Querschnittschnitt und
Fig. 3:
ein zweites Ausführungsbeispiel einer erfindungsgemäßen Hochdruckleitung im Längs- und Querschnitt.
Show it:
Fig. 1:
a circuit diagram of a fuel injection system;
Fig. 2:
a first embodiment of a high-pressure line according to the invention in the longitudinal and cross-sectional section and
3:
A second embodiment of a high-pressure line according to the invention in longitudinal and cross-section.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In Fig. 1 ist ein Blockschaltbild eines Rail-Kraftstoffeinspritzsystems mit einer Radialkolbenpumpe 1 dargestellt, das stellvertretend für andere Bauarten zur Erläuterung der erfindungsgemäßen Hochdruckleitung herangezogen wird. Die Erfindung ist jedoch nicht auf solche Kraftstoffeinspritzsysteme beschränkt, sondern kann überall dort vorteilhaft eingesetzt werden, wo unerwünschte Druckpulsationen in Hochdruckanlagen auftreten, insbesondere in anderen Kraftstoffeinspritzsystemen, wie z. B. Pumpe-Leitung-Düse-Kraftstoffeinspritzsystemen.In Fig. 1 is a block diagram of a rail fuel injection system with a radial piston pump 1 represented, representing other types of construction Explanation of the high pressure line of the invention is used. However, the invention is not on such fuel injection systems limited, but can be used wherever advantageous where unwanted Pressure pulsations occur in high-pressure systems, especially in other fuel injection systems, such. B. pump-line-nozzle fuel injection systems.

Die Radialkolbenpumpe 1 hat eine Saugseite 3 und eine (Hoch)-Druckseite 5, die über ein Rückschlagventil 7 mit einem Rail 9 in Verbindung steht. Das Rückschlagventil 7 und das Rail 9 werden durch eine erste Hochdruckleitung 8 hydraulisch miteinander verbunden.The radial piston pump 1 has a suction side 3 and a (High) -Printseite 5, which has a check valve 7 with a rail 9 is in communication. The check valve 7 and the rail 9 are through a first high-pressure line. 8 hydraulically connected.

Die Druckregelung im Rail 9 erfolgt über ein Druckregelventil 11, welches überschüssigen Kraftstoff aus dem Rail 9 in einen Kraftstoffrücklauf 13 leitet. Das Rail 9 und das Druckregelventil 11 werden durch eine zweite Hochdruckleitung 10 hydraulisch miteinander verbunden. The pressure control in the rail 9 via a Pressure control valve 11, which excess fuel off the rail 9 in a fuel return 13 passes. The rail 9 and the pressure regulating valve 11 are replaced by a second High pressure line 10 hydraulically connected.

Der Kraftstoffrücklauf 13 mündet in die Saugseite 3 der Radialkolbenpumpe 1. Die Saugseite 3 wird von einem hier nicht dargestellten Kraftstofftank mit Kraftstoff versorgt.The fuel return 13 opens into the suction side 3 of Radial piston pump 1. The suction side 3 is of one here Not shown fuel tank supplied with fuel.

Zwischen Druckseite 5 und Kraftstoffrücklauf 13, der wiederum mit der Saugseite 3 hydraulisch in Verbindung steht, ist ein Mengensteuerventil 15 vorgesehen. Wenn das Mengensteuerventil 15, wie in Fig. 1 dargestellt, geöffnet ist, kann auf der Druckseite 5 der Radialkolbenpumpe 1 kein Druckaufbau stattfinden, da eine hydraulische Verbindung über den Kraftstoffrücklauf 13 mit der Saugseite 3 besteht. In diesem Zustand fördert die Radialkolbenpumpe 1 keinen Kraftstoff in das Rail 9, da der Druck im Rail 9 sehr viel höher als der Druck auf der Saugseite 3 der Radialkolbenpumpe 1 ist.Between the pressure side 5 and fuel return 13, the in turn hydraulically connected to the suction side 3 is, a quantity control valve 15 is provided. If that Volume control valve 15, as shown in Fig. 1, opened is, on the pressure side 5 of the radial piston pump 1 no Pressure build-up take place as a hydraulic connection over the fuel return 13 with the suction side 3 is. In this state, the radial piston pump 1 promotes none Fuel in the rail 9, because the pressure in the rail 9 very much higher than the pressure on the suction side 3 of Radial piston pump 1 is.

Wenn das Mengensteuerventil 15 geschlossen wird, ist die hydraulische Verbindung zwischen Saugseite 3 und Druckseite 5 über den Kraftstoffrücklauf 13 unterbrochen, so dass ein Druckaufbau in den Pumpenelementen 17 der Radialkolbenpumpe 1 stattfinden kann. In diesem Zustand fördert die Radialkolbenpumpe 1 Kraftstoff in das Rail 9, sobald der von den Pumpenelementen 17 aufgebaute Druck größer als der im Rail 9 herrschende Druck ist. Durch die nicht stetige Förderung der Pumpenelemente 17, durch Schaltvorgänge des Mengensteuerventils 15, des Druckregelventils 11 oder andere instationäre Vorgänge kann es zu unerwünschten Druckpulsationen im Hochdruckbereich des Kraftstoffeinspritzsystems kommen.
Das Rail 9 ist durch weitere Hochdruckleitungen 19 mit Injektoren 21 hydraulisch verbunden, die den Kraftstoff in die nicht dargestellten Brennräume oder Ansaugkanäle einer nicht dargestellten Brennkraftmaschine einspritzen.When the quantity control valve 15 is closed, the hydraulic connection between the suction side 3 and pressure side 5 is interrupted via the fuel return 13, so that a pressure build-up in the pump elements 17 of the radial piston pump 1 can take place. In this state, the radial piston pump 1 promotes fuel into the rail 9 as soon as the pressure built up by the pump elements 17 is greater than the pressure prevailing in the rail 9 pressure. Due to the non-steady promotion of the pump elements 17, by switching operations of the quantity control valve 15, the pressure control valve 11 or other transient processes can lead to undesirable pressure pulsations in the high pressure region of the fuel injection system.
The rail 9 is hydraulically connected by further high-pressure lines 19 with injectors 21 which inject the fuel into the combustion chambers or intake ports, not shown, of an internal combustion engine, not shown.

Durch den Einsatz der nachfolgend anhand der Fig. 2 und 3 beschriebenen erfindungsgemäßen Hochdruckleitungen 23 anstelle der ersten Hochdruckleitung 8, der zweiten Hochdruckleitung 10 oder der Hochdruckleitungen 19 können die genannten Druckpulsationen verringert oder sogar vollständig unterdrückt werden.Through the use of the below with reference to FIGS. 2 and 3 described high-pressure lines 23 according to the invention instead of the first high pressure line 8, the second High-pressure line 10 or the high-pressure lines 19 can the mentioned pressure pulsations reduced or even be completely suppressed.

Der Einsatz der erfindungsgemäßen Hochdruckleitungen kann bei Bedarf mit anderen Maßnahmen zur Unterdrückung von Druckpulsationen kombiniert werden.The use of the high-pressure lines according to the invention can if necessary, with other measures to suppress Pressure pulsations are combined.

In der Fig. 2 ist eine erfindungsgemäße Hochdruckleitung 23 im Längsschnitt und im Querschnitt entlang der Schnittlinie A-A dargestellt. Die erfindungsgemäße Hochdruckleitung 23 weist, wie andere Leitungen auch, einen Innendurchmesser 25 und einen Außendurchmesser 27 auf. Die erfindungsgemäße Hochdruckleitung 23 hat einen zylindrischen Querschnitt. Im Bereich der Schnittlinie A-A weist die Hochdruckleitung 23 eine Einschnürung 29 auf. Diese Einschnürung 29 wird bei dem ersten Ausführungsbeispiel gemäß Fig. 2 durch rotierende Rollierwerkzeuge 31 hergestellt. Die Rollierwerkzeuge 31 drehen sich um ihre Drehachse 33. Gleichzeitig wird auch die Hochdruckleitung 23 gedreht. Die Drehachsen 33 und damit auch die Rollierwerkzeuge 31 werden so lange aufeinander zu bewegt, bis die gewünschte Einschnürung 29 in der Hochdruckleitung 23 hergestellt wurde. Dabei ist darauf zu achten, dass der Innendurchmesser der erfindungsgemäßen Hochdruckleitung 23 im Bereich der Einschnürung 29 nicht vollständig verschlossen wird.FIG. 2 shows a high-pressure line 23 according to the invention in longitudinal section and in cross section along the section line A-A shown. The high-pressure line 23 according to the invention has, like other lines also, an inner diameter 25th and an outer diameter 27. The inventive High pressure line 23 has a cylindrical cross section. in the Area of the section line A-A has the high pressure line 23rd a constriction 29 on. This constriction 29 is at the first embodiment shown in FIG. 2 by rotating roller burnishing tools 31 produced. The Burnishing tools 31 rotate about their axis of rotation 33. At the same time, the high pressure line 23 is rotated. The Rotary axes 33 and thus the rolling tools 31 are as long moved towards each other until the desired Constriction 29 made in the high pressure line 23 has been. It must be ensured that the Inner diameter of the high-pressure line 23 according to the invention in the area of constriction 29 not complete is closed.

In Fig. 2 ist ein Querschnitt durch das erste Ausführungsbeispiel einer erfindungsgemäßen Hochdruckleitung 23 entlang der Schnittlinie A-A dargestellt. In Fig. 2 is a cross section through the first Embodiment of an inventive High pressure line 23 along the section line A-A shown.

In Fig. 3 ist ein zweites Ausführungsbeispiel einer erfindungsgemäßen Hochdruckleitung 23 ebenfalls im Längsschnitt und im Querschnitt entlang der Schnittlinie A-A dargestellt. Gleiche Bauteile werden mit gleichen Bezugszeichen versehen und es gilt das bezüglich Fig. 2 Gesagte entsprechend. Bei diesem Ausführungsbeispiel ist die Einschnürung 29 nicht rotationssymmetrisch, sondern die Einschnürung 29 ist durch Quetschen der Hochdruckleitung 23 hergestellt worden. Demzufolge ist der Querschnitt im Bereich der Einschnürung 29 nicht rotationssymmetrisch, sondern weist zwei Abflachungen 35 auf. Diese Herstellung der Einschnürung 29 ist auch sehr einfach und kostengünstig und bewirkt auch die gewünschte Verengung des Strömungsquerschnitts der Hochdruckleitung 23 im Bereich der Einschnürung 29.In Fig. 3 is a second embodiment of a High pressure line 23 according to the invention also in Longitudinal section and in cross section along the section line A-A shown. Same components are the same Reference numeral provided and it applies with respect to FIG. 2 Said accordingly. In this embodiment the constriction 29 is not rotationally symmetrical, but the Constriction 29 is by squeezing the high pressure line 23rd been prepared. Consequently, the cross section is in Area of the constriction 29 not rotationally symmetric, but has two flats 35. This production The constriction 29 is also very simple and inexpensive and also causes the desired narrowing of the Flow cross section of the high pressure line 23 in the area the constriction 29.

Claims (10)

Hochdruckleitung für ein Kraftstoffeinspritzsystem von Brennkraftmaschinen, dadurch gekennzeichnet, dass die Hochdruckleitung (23) mindestens eine Einschnürung (29) aufweist.High-pressure line for a fuel injection system of internal combustion engines, characterized in that the high-pressure line (23) has at least one constriction (29). Hochdruckleitung nach Anspruch 1, dadurch gekennzeichnet, dass die mindestens eine Einschnürung (29) durch Umformen hergestellt wird.High-pressure line according to claim 1, characterized in that the at least one constriction (29) is produced by forming. Hochdruckleitung nach Anspruch 2, dadurch gekennzeichnet, dass die mindestens eine Einschnürung (29) durch Rollieren oder Walzen, hergestellt wird.High-pressure line according to claim 2, characterized in that the at least one constriction (29) by rolling or rolling, is produced. Hochdruckleitung nach Anspruch 2, dadurch gekennzeichnet, dass die mindestens eine Einschnürung (29) durch Quetschen hergestellt wird.High-pressure line according to claim 2, characterized in that the at least one constriction (29) is produced by squeezing. Hochdruckleitung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die mindestens eine Einschnürung (29) bevorzugt an einem Ende der Hochdruckleitung (23) angeordnet ist.High-pressure line according to one of the preceding claims, characterized in that the at least one constriction (29) is preferably arranged at one end of the high-pressure line (23). Hochdruckleitung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Hochdruckleitung (23) im Hochdruckbereich eines Kraftstoffeinspritzsystems angeordnet ist.High-pressure line according to one of the preceding claims, characterized in that the high-pressure line (23) is arranged in the high-pressure region of a fuel injection system. Hochdruckleitung nach Anspruch 6, dadurch gekennzeichnet, dass die Hochdruckleitung (23) zwischen einer Kraftstoffhochdruckpumpe (1) und einem Rail (9) angeordnet ist.High-pressure line according to claim 6, characterized in that the high-pressure line (23) between a high-pressure fuel pump (1) and a rail (9) is arranged. Hochdruckleitung nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Hochdruckleitung (23) zwischen einem Rail (9) und einem Injektor (21) angeordnet ist.High-pressure line according to claim 6 or 7, characterized in that the high-pressure line (23) between a rail (9) and an injector (21) is arranged. Hochdruckleitung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die Hochdruckleitung (23) zwischen zwei Rails (9) angeordnet ist.High-pressure line according to one of claims 6 to 8, characterized in that the high-pressure line (23) between two rails (9) is arranged. Hochdruckleitung nach Anspruch 6, dadurch gekennzeichnet, dass die Hochdruckleitung (23) zwischen einer Kraftstoffhochdruckpumpe und einer Düse in einem Pumpe-Leitung-Düse-Kraftstoffeinspritzsystem angeordnet ist.High-pressure line according to claim 6, characterized in that the high-pressure line (23) is arranged between a high-pressure fuel pump and a nozzle in a pump-line-nozzle fuel injection system.
EP03008432A 2002-09-09 2003-04-11 High-pressure pipe for fuel injection systems of internal combustion engine Withdrawn EP1398496A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10241657 2002-09-09
DE10241657A DE10241657A1 (en) 2002-09-09 2002-09-09 High pressure line for Kraftstoffeinspitzsysteme of internal combustion engines

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EP1398496A2 true EP1398496A2 (en) 2004-03-17
EP1398496A3 EP1398496A3 (en) 2005-04-20

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WO2011047986A1 (en) 2009-10-21 2011-04-28 Robert Bosch Gmbh Fuel injection system
US10746147B2 (en) 2016-05-11 2020-08-18 Peter Fuchs Technology Group Ag High-pressure line

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JP2009085403A (en) * 2007-10-02 2009-04-23 Denso Corp Pipe for heat exchanger, and heat exchanger
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DE4006501A1 (en) * 1990-03-02 1991-09-05 Bayerische Motoren Werke Ag Distributor pipe for fuel injection system - has local reductions in cross=sectional area to equalise fuel pressure
DE4131501A1 (en) * 1991-09-21 1993-03-25 Bosch Gmbh Robert Damper for pressure waves in IC- engine fuel feed pipe - reduces tension in fluid in fluid chamber fluid-tightly sepd. from damper chamber by membrane
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US6056263A (en) * 1996-10-02 2000-05-02 Robert Bosch Gmbh Valve with constrictions to adjust stroke length
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EP1217202A1 (en) * 2000-12-22 2002-06-26 Renault Method of damping pressure waves in a hydraulic pipe and common rail injection system using this method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011047986A1 (en) 2009-10-21 2011-04-28 Robert Bosch Gmbh Fuel injection system
DE102009045898A1 (en) 2009-10-21 2011-04-28 Robert Bosch Gmbh Fuel injection system
US10746147B2 (en) 2016-05-11 2020-08-18 Peter Fuchs Technology Group Ag High-pressure line

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EP1398496A3 (en) 2005-04-20
DE10241657A1 (en) 2004-03-25

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