EP1704327B1 - High-pressure fuel pump for common-rail injection systems - Google Patents

High-pressure fuel pump for common-rail injection systems Download PDF

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Publication number
EP1704327B1
EP1704327B1 EP04766829A EP04766829A EP1704327B1 EP 1704327 B1 EP1704327 B1 EP 1704327B1 EP 04766829 A EP04766829 A EP 04766829A EP 04766829 A EP04766829 A EP 04766829A EP 1704327 B1 EP1704327 B1 EP 1704327B1
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EP
European Patent Office
Prior art keywords
pump housing
shaped container
pressure
pump
pot
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.)
Not-in-force
Application number
EP04766829A
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German (de)
French (fr)
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EP1704327A1 (en
Inventor
Uwe Nigrin
Mohsen Pirouz
Stefan Portner
Ngoc-Tam Vu
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Siemens AG
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Siemens AG
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Publication of EP1704327A1 publication Critical patent/EP1704327A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/121—Casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections

Definitions

  • the invention relates to a high-pressure fuel pump for common rail injection systems with a high-pressure accumulator integrated in the high-pressure fuel pump.
  • High-pressure fuel pumps for common-rail injection systems are generally designed as radial piston pumps. From the DE 102 285 51.9 the applicant is already known a radial piston high-pressure pump for common-rail injection systems with a high-pressure accumulator integrated in the radial piston high-pressure pump.
  • the radial piston high pressure pump has a housing in which a drive shaft is guided.
  • the drive shaft has an eccentric portion on which a cam ring is mounted.
  • On the cam preferably support several, with respect to the drive shaft radially in the pump body longitudinally movably guided pump piston.
  • Each pump piston is assigned a suction valve and a pressure valve. Via the suction valve, fuel is supplied from the low pressure area in the pump piston.
  • the compressed fuel is discharged via the pressure valve and fed via a high-pressure line to the common high-pressure accumulator (common rail).
  • the high-pressure accumulator is integrated in a peripheral region of the high-pressure fuel pump.
  • the object of the invention is therefore to provide a high-pressure fuel pump for common-rail injection systems with a high-pressure accumulator integrated in the radial piston high-pressure accumulator whose high-pressure accumulator volume can be changed in a simple and cost-effective manner and which is inexpensive to manufacture.
  • the invention is characterized in that the high-pressure accumulator is formed by an opening introduced into the pump housing and a cup-shaped container arranged in the opening.
  • the production of such a high-pressure accumulator is particularly simple and inexpensive.
  • the high-pressure storage volume can be easily and inexpensively changed in such a structure, in which only a cup-shaped container with a different high-pressure storage volume is used.
  • the high-pressure pump can be quickly, easily and inexpensively adapted to the particular requirements. It is not necessary to change the pump yourself. It is not even necessary to disassemble the pump for conversion.
  • a preferred embodiment of the invention provides that the opening in the pump housing and the cup-shaped container are cylindrical.
  • the cylindrical Training the components is a particularly simple production, for example by drilling or turning, possible.
  • a particularly advantageous embodiment of the invention provides that the opening in the pump housing has an internal thread and the pot-shaped container has a corresponding with the internal thread external thread.
  • the cup-shaped container can be easily screwed into the pump housing. This simplifies the assembly significantly, which further cost savings are possible.
  • a further advantageous embodiment of the invention provides that the opening in the pump housing has an internal thread and that in the internal thread a screw can be screwed, which bears against a collar of the cup-shaped container and which fixes the container in the pump housing.
  • the screw sleeve When screwed into the pump housing, the screw sleeve performs both an axial movement and a rotational movement about its axis.
  • the pot-shaped container is pressed by the threaded sleeve, however, only in the axial direction in the pump housing.
  • sealing surfaces formed on the pot-shaped container when screwing are not rotated on a corresponding sealing surface of the pump housing but merely pressed in the axial direction, whereby the sealing surfaces can be damaged less quickly.
  • a further advantageous embodiment of the invention provides that in the cylindrical opening in the pump housing and / or on an outer surface of the cup-shaped container or the lateral surface of the screw a relief groove is formed, via which a possibly between the pump housing and the pot-shaped container or the screw sleeve leaking leakage current is dissipated.
  • the relief groove is preferably connected via a discharge line to the tank or the suction side of the pump.
  • FIG. 1 shows a first exemplary embodiment of the high-pressure fuel pump.
  • the high-pressure fuel pump is designed as a radial piston pump and has a pump housing 1, in which a drive shaft 2 is rotatably mounted.
  • the drive shaft 2 is formed as an eccentric shaft.
  • the pump piston 18 are arranged on the outer circumference of the eccentric 17 preferably three, arranged at an angle and 120 degrees to each other.
  • each pump piston 18 performs a complete suction and compression stroke by.
  • the cylinder piston 18 moves in the direction of the drive shaft 2 and via a, not shown in Figure 1, the suction valve is supplied to the cylinder chamber fuel.
  • the suction valve closes and the fuel is subsequently compressed during the upward movement of the pump piston 18 to a pressure of up to 1800 bar.
  • the pressure valve 19 opens and the compressed fuel flows from the cylinder chamber, via a high-pressure line 20, to the common high-pressure accumulator 4.
  • the high-pressure accumulator is introduced from an introduced into the pump housing 1 opening 5 and in the Opening 5 arranged, cup-shaped container 6 is formed.
  • the introduction of the opening 5 can be done in a simple manner by machining, for example by drilling or turning.
  • the adaptation of the high-pressure accumulator volume to different types of engine is effected by the replacement of the cup-shaped container 6. Special refinements of the high-pressure accumulator 4 are shown in more detail in FIGS. 2 to 4 below.
  • FIG 2 shows a first embodiment of a high-pressure fuel storage 4 as it may be formed in a high-pressure fuel pump of Figure 1.
  • the high-pressure fuel accumulator 4 is formed by an opening 5 introduced into the pump housing 1 and a cup-shaped container 6 arranged in the opening 5.
  • the opening 5 in the pump housing 1 has an internal thread 7.
  • the cup-shaped container 6 has on its lateral surface a corresponding external thread 8. In this way, the cup-shaped container 6, in a particularly simple manner, in the pump housing. 1 be screwed.
  • a key-neck 21 is formed on the cup-shaped container 4.
  • the open end 13 of the cup-shaped container is formed as a flat sealing surface.
  • an annular relief groove 12 is provided in order to prevent that a possible leakage flow can pass through the thread to the outside.
  • the relief groove 12 is formed in the lateral surface of the opening 5.
  • a relief groove can also be formed in the outer circumferential surface of the cup-shaped container 6. The leakage flow from the relief groove 12, guided via a discharge line, not shown, back into the fuel tank or on the suction side of the high-pressure fuel pump. This ensures that no fuel can escape into the environment.
  • the high pressure accumulator 4 is connected via a connecting line 22 to the high pressure side of the high-pressure fuel pump.
  • the connecting line 22 opens in the embodiment shown, axially in the opening 5 of the high-pressure accumulator 4. This allows the connecting line 22 to be drilled in one step with the opening 5, without the pump housing 1 must be re-clamped. Alternatively, the connecting line 22 also in the lateral surface of the opening 5, the pressure accumulator 4, opens. From the high-pressure accumulator or the connecting line 22 branch off one or more lines, which open into one or more high-pressure ports 23.
  • the high-pressure connections 23 can be connected to lines which connect the high-pressure accumulator 4 with the injectors of an internal combustion engine. It is possible that from the high-pressure fuel pump only a high-pressure port 23 branches off and the distribution of the fuel takes place via a fuel distributor arranged outside the pump. Or it is already on the pump housing 1, a number of injectors corresponding number of high-pressure ports 23 are formed so that the individual lines can be performed directly from the pump to the individual injectors.
  • FIG. 3 shows a second exemplary embodiment of a high-pressure accumulator 4 as it can be used in a high-pressure pump according to FIG.
  • the high-pressure accumulator 4 substantially corresponds to the high-pressure accumulator as it has already been described in more detail in Figure 2. It will therefore be discussed below only the differences from this embodiment.
  • the main difference is that the lateral surface 11 of the cup-shaped container 6, in the region of the open end face 13, an outer cone 15 which is pressed against a, formed in the opening 5 of the pump housing 1, corresponding conical surface 16.
  • the conical surfaces 15, 16 serve to seal the high-pressure accumulator 4.
  • the conical design of the sealing surfaces results in a particularly secure seal. It is particularly advantageous if the pot-shaped container 6, in the region of the outer cone 15, has a reduced wall thickness. It thereby arises a slightly elastic to be deformed outer cone 15, whereby even then a secure seal is ensured when it comes to setting the screw.
  • Figure 4 shows a third embodiment of a high-pressure accumulator 4 as it can be used in the high-pressure fuel pump of Figure 1.
  • the embodiment corresponds essentially the embodiment in Figure 3, whose description is referenced here.
  • the high-pressure accumulator 4 also has an additional threaded sleeve 9, which is arranged between the pump housing 1 and the cup-shaped container 6.
  • the screw 9 is screwed into the opening 5 in the pump housing 1.
  • the tightening force of the screw is transmitted to the cup-shaped container 6 via a collar 10 formed in the cup-shaped container.
  • the outer cone 15 formed in the lateral surface of the cup-shaped container 6 is pressed against the corresponding conical surface 16 formed in the opening 5 of the pump housing 1.
  • the screw has the advantage that when tightening the connection, only the screw 9 performs a rotational movement.
  • the conical surfaces 15, 16, however, are pressed against each other only in the axial direction. It is not so easy to damage the conical surfaces and thereby damage the seal of the high-pressure accumulator.
  • the screw sleeve can be used both for a flat, end-side seal, as shown in Fig. 2, as well as for a seal over the Konusdicht vom according to FIGS. 3 and 4.
  • the invention is thus characterized by the fact that the high-pressure accumulator 4 is formed in a particularly simple manner by an opening 5 introduced into the pump housing 1 and a pot-shaped container 6 arranged in the opening 5.
  • the opening 5 can be introduced into the pump housing 1 by a simple and inexpensive exciting machining, for example by drilling or turning.
  • the storage volume of the high-pressure accumulator 4 is through the simple exchange the cup-shaped container 6 adapted to different applications.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Die Erfindung betrifft eine Kraftstoffhochdruckpumpe für Common-Rail-Einspritzsysteme mit einem in die Kraftstoffhochdruckpumpe integrierten Hochdruckspeicher.The invention relates to a high-pressure fuel pump for common rail injection systems with a high-pressure accumulator integrated in the high-pressure fuel pump.

Kraftstoffhochdruckpumpen für Common-Rail-Einspritzsysteme sind in der Regel als Radialkolbenpumpen ausgebildet. Aus der DE 102 285 51.9 der Anmelderin ist bereits eine Radialkolbenhochdruckpumpe für Common-Rail-Einspritzsysteme mit einem in die Radialkolbenhochdruckpumpe integrierten Hochdruckspeicher bekannt. Die Radialkolbenhochdruckpumpe weist ein Gehäuse auf, in dem eine Antriebswelle geführt ist. Die Antriebswelle besitzt einen Exenterabschnitt, auf dem ein Hubring gelagert ist. An dem Hubring stützen sich vorzugsweise mehrere, bezüglich der Antriebswelle radial in den Pumpenkörper längs bewegbar geführte Pumpenkolben ab. Jedem Pumpenkolben ist ein Saugventil sowie ein Druckventil zugeordnet. Über das Saugventil wird im Pumpenkolben Kraftstoff aus dem Niederdruckbereich zugeführt. Nach dem Druckaufbau wird der komprimierte Kraftstoff über das Druckventil abgeleitet und über eine Hochdruckleitung dem gemeinsamen Hochdruckspeicher (Common-Rail) zugeführt. Um eine kompakte Bauweise zu ermöglichen, ist der Hochdruckspeicher in einem Umfangsbereich der Kraftstoffhochdruckpumpe integriert.High-pressure fuel pumps for common-rail injection systems are generally designed as radial piston pumps. From the DE 102 285 51.9 the applicant is already known a radial piston high-pressure pump for common-rail injection systems with a high-pressure accumulator integrated in the radial piston high-pressure pump. The radial piston high pressure pump has a housing in which a drive shaft is guided. The drive shaft has an eccentric portion on which a cam ring is mounted. On the cam preferably support several, with respect to the drive shaft radially in the pump body longitudinally movably guided pump piston. Each pump piston is assigned a suction valve and a pressure valve. Via the suction valve, fuel is supplied from the low pressure area in the pump piston. After the pressure builds up, the compressed fuel is discharged via the pressure valve and fed via a high-pressure line to the common high-pressure accumulator (common rail). In order to allow a compact design, the high-pressure accumulator is integrated in a peripheral region of the high-pressure fuel pump.

Bei einer Integration des Hochdruckspeichers in der Pumpe ist es allerdings schwierig, die Hochdruckpumpe an verschiedene Motortypen anzupassen. Für jeden Motortyp muss daher eine eigene Kraftstoffhochdruckpumpe konstruiert und hergestellt werden. Das nachträgliche Anpassen des Kraftstoffhochdruckspeichers an die Gegebenheiten ist kaum, oder nur mit erheblichen Aufwand, möglich.
Abgesehen davon ist das Einbringen eines Hochdruckspeichers in das Pumpengehäuse generell sehr aufwendig und damit teuer.When integrating the high-pressure accumulator in the pump, however, it is difficult to adapt the high-pressure pump to different engine types. For each engine type, therefore, a separate high-pressure fuel pump must be designed and manufactured. The subsequent adaptation of the high-pressure fuel storage to the conditions is hardly, or only with considerable effort, possible.
Apart from that, the introduction of a high pressure accumulator in the pump housing is generally very expensive and therefore expensive.

Aufgabe der Erfindung ist es daher, eine Kraftstoffhochdruckpumpe für Common-Rail-Einspritzsysteme mit einem in die Radialkolbenhochdruckpumpe integrierten Hochdruckspeicher bereitzustellen, dessen Hochdruckspeichervolumen auf einfache und kostengünstige Weise verändert werden kann und der dabei preiswert herzustellen ist.The object of the invention is therefore to provide a high-pressure fuel pump for common-rail injection systems with a high-pressure accumulator integrated in the radial piston high-pressure accumulator whose high-pressure accumulator volume can be changed in a simple and cost-effective manner and which is inexpensive to manufacture.

Die Aufgabe wird gelöst durch die Merkmale des unabhängigen Patentanspruchs. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.The object is solved by the features of the independent claim. Advantageous embodiments of the invention are characterized in the subclaims.

Die Erfindung zeichnet sich dadurch aus, dass der Hochdruckspeicher von einer in das Pumpengehäuse eingebrachten Öffnung und einem in der Öffnung angeordneten topfförmigen Behälter gebildet wird. Das Herstellen eines solchen Hochdruckspeichers ist besonders einfach und preiswert. Außerdem kann das Hochdruckspeichervolumen bei einem solchen Aufbau einfach und kostengünstig verändert werden, in dem lediglich ein topfförmiger Behälter mit einem unterschiedlichen Hochdruckspeichervolumen eingesetzt wird. Somit kann die Hochdruckpumpe schnell, einfach und kostengünstig an die jeweiligen Erfordernisse angepasst werden. Es ist nicht notwendig die Pumpe selbst zu verändern. Es ist nicht einmal notwendig, die Pumpe zum Umrüsten zu zerlegen.The invention is characterized in that the high-pressure accumulator is formed by an opening introduced into the pump housing and a cup-shaped container arranged in the opening. The production of such a high-pressure accumulator is particularly simple and inexpensive. In addition, the high-pressure storage volume can be easily and inexpensively changed in such a structure, in which only a cup-shaped container with a different high-pressure storage volume is used. Thus, the high-pressure pump can be quickly, easily and inexpensively adapted to the particular requirements. It is not necessary to change the pump yourself. It is not even necessary to disassemble the pump for conversion.

Eine bevorzugte Ausgestaltung der Erfindung sieht vor, dass die Öffnung im Pumpengehäuse sowie der topfförmige Behälter zylinderförmig ausgebildet sind. Durch die zylinderförmige Ausbildung der Bauteile ist eine besonders einfache Fertigung, beispielsweise durch Bohren oder Drehen, möglich.A preferred embodiment of the invention provides that the opening in the pump housing and the cup-shaped container are cylindrical. By the cylindrical Training the components is a particularly simple production, for example by drilling or turning, possible.

Eine besonders vorteilhafte Ausgestaltung der Erfindung sieht vor, dass die Öffnung im Pumpengehäuse ein Innengewinde aufweist und der topfförmige Behälter ein mit dem Innengewinde korrespondierendes Außengewinde aufweist. Hierdurch kann der topfförmige Behälter auf einfache Weise, in das Pumpengehäuse eingeschraubt werden. Damit vereinfacht sich die Montage erheblich, wodurch weitere Kosteneinsparungen möglich sind.A particularly advantageous embodiment of the invention provides that the opening in the pump housing has an internal thread and the pot-shaped container has a corresponding with the internal thread external thread. As a result, the cup-shaped container can be easily screwed into the pump housing. This simplifies the assembly significantly, which further cost savings are possible.

Eine weitere vorteilhafte Ausgestaltung der Erfindung sieht vor, dass die Öffnung im Pumpengehäuse ein Innengewinde aufweist und dass in das Innengewinde eine Schraubhülse einschraubbar ist, die an einem Bund des topfförmigen Behälters anliegt und die den Behälter im Pumpengehäuse fixiert. Die Schraubhülse führt beim Einschrauben in das Pumpengehäuse sowohl eine axiale Bewegung als auch eine Drehbewegung um ihre Achse durch. Der topfförmige Behälter wird von der Schraubhülse jedoch nur in axialer Richtung in das Pumpengehäuse gedrückt. Hierdurch werden am topfförmigen Behälter ausgebildete Dichtflächen beim Einschrauben nicht auf einer korrespondierenden Dichtfläche des Pumpengehäuses gedreht sondern lediglich in axialer Richtung darauf gepresst, wodurch die Dichtflächen weniger schnell beschädigt werden können.A further advantageous embodiment of the invention provides that the opening in the pump housing has an internal thread and that in the internal thread a screw can be screwed, which bears against a collar of the cup-shaped container and which fixes the container in the pump housing. When screwed into the pump housing, the screw sleeve performs both an axial movement and a rotational movement about its axis. The pot-shaped container is pressed by the threaded sleeve, however, only in the axial direction in the pump housing. As a result, sealing surfaces formed on the pot-shaped container when screwing are not rotated on a corresponding sealing surface of the pump housing but merely pressed in the axial direction, whereby the sealing surfaces can be damaged less quickly.

Eine weitere vorteilhafte Ausgestaltung der Erfindung sieht vor, dass in der zylinderförmigen Öffnung im Pumpengehäuse und/oder auf einer äußeren Mantelfläche des topfförmigen Behälters beziehungsweise der Mantelfläche der Schraubhülse eine Entlastungsnut ausgebildet ist, über die ein eventuell zwischen dem Pumpengehäuse und dem topfförmigen Behälter beziehungsweise der Schraubhülse austretender Leckagestrom abführbar ist. Hierzu ist die Entlastungsnut vorzugsweise über eine Abführleitung mit dem Tank oder der Saugseite der Pumpe verbunden.A further advantageous embodiment of the invention provides that in the cylindrical opening in the pump housing and / or on an outer surface of the cup-shaped container or the lateral surface of the screw a relief groove is formed, via which a possibly between the pump housing and the pot-shaped container or the screw sleeve leaking leakage current is dissipated. For this purpose, the relief groove is preferably connected via a discharge line to the tank or the suction side of the pump.

Ausführungsbeispiele der Erfindung werden nachfolgenden anhand der schematischen Zeichnungen erläutert. Es zeigt:

Figur 1
den prinzipiellen Aufbau einer Radialkolbenhochdruckpumpe, mit einem in die Hochdruckpumpe integrierten Hochdruckspeicher,
Figur 2
ein erstes Ausführungsbeispiel eines Hochdruckspeichers wie er in einer Radialkolbenhochdruckpumpe nach Figur 1 verwendet werden kann,
Figur 3
ein zweites Ausführungsbeispiel eines Hochdrucksspeichers wie er in einer Hochdruckpumpe nach Figur 1 verwendet werden kann, und
Figur 4
ein drittes Ausführungsbeispiel eines Hochdruckspeichers wie er in einer Radialkolbenhochdruckpumpe nach Figur 1 verwendet werden kann,
Embodiments of the invention are explained below with reference to the schematic drawings. It shows:
FIG. 1
the basic structure of a radial piston high-pressure pump, with a high-pressure accumulator integrated in the high-pressure pump,
FIG. 2
A first embodiment of a high pressure accumulator as it can be used in a radial piston high pressure pump according to Figure 1,
FIG. 3
a second embodiment of a high-pressure accumulator as it can be used in a high-pressure pump according to Figure 1, and
FIG. 4
A third embodiment of a high pressure accumulator as it can be used in a radial piston high pressure pump according to Figure 1,

Elemente gleicher Konstruktion und Funktion sind dabei Figur-übergreifend mit den gleichen Bezugszeichen versehen.Elements of the same construction and function are provided with the same reference numbers across the figures.

Figur 1 zeigt ein erstes Ausführungsbeispiel der Kraftstoffhochdruckpumpe. Die Kraftstoffhochdruckpumpe ist dabei als Radialkolbenpumpe ausgebildet und weist ein Pumpengehäuse 1 auf, in dem eine Antriebswelle 2 drehbar gelagert ist. Die Antriebswelle 2 ist als Exenterwelle ausgebildet. Am Außenumfang des Exzenters 17 sind vorzugsweise drei, in einem Winkel und 120 Grad zueinander angeordnete, Pumpenkolben 18 angeordnet. während einer Umdrehung der Antriebswelle 2 führt jeder Pumpenkolben 18 einen vollständigen Saug- und Kompressionshub durch. Während des Saughubs bewegt sich der Zylinderkolben 18 in Richtung der Antriebswelle 2 und über ein, in Figur 1 nicht dargestelltes, Saugventil wird dem Zylinderraum Kraftstoff zugeführt. Nachdem der Zylinderkolben 18 seine untere Endstellung erreicht hat, erfolgt eine Umkehrung der Bewegungsrichtung und es beginnt der Kompressionshub. Dabei schließt das Saugventil und der Kraftstoff wird nachfolgend, während der Aufwärtsbewegung des Pumpenkolbens 18, auf einen Druck von bis zu 1800 Bar komprimiert. Beim Erreichen der oberen Endstellung des Pumpenkolbens 18, öffnet das Druckventil 19 und der komprimierte Kraftstoff strömt aus dem Zylinderraum, über eine Hochdruckleitung 20, zu dem gemeinsamen Hochdruckspeicher 4. Der Hochdruckspeicher wird dabei von einer in das Pumpengehäuse 1 eingebrachten Öffnung 5 und einem in der Öffnung 5 angeordneten, topfförmigen Behälter 6 gebildet. Das Einbringen der Öffnung 5 kann dabei auf einfache Weise durch spanende Bearbeitung, beispielsweise durch Bohren oder Drehen erfolgen. Das Anpassen des Hochdruckspeichervolumens an verschiedene Motortypen erfolgt durch den Austausch des topfförmigen Behälters 6. Spezielle Ausgestaltungen des Hochdruckspeichers 4 sind nachfolgend in den Figuren 2 bis 4 näher gezeigt.FIG. 1 shows a first exemplary embodiment of the high-pressure fuel pump. The high-pressure fuel pump is designed as a radial piston pump and has a pump housing 1, in which a drive shaft 2 is rotatably mounted. The drive shaft 2 is formed as an eccentric shaft. On the outer circumference of the eccentric 17 preferably three, arranged at an angle and 120 degrees to each other, the pump piston 18 are arranged. During one revolution of the drive shaft 2, each pump piston 18 performs a complete suction and compression stroke by. During the intake stroke, the cylinder piston 18 moves in the direction of the drive shaft 2 and via a, not shown in Figure 1, the suction valve is supplied to the cylinder chamber fuel. After the cylinder piston 18 has reached its lower end position, there is a reversal of the direction of movement and it begins the compression stroke. In the process, the suction valve closes and the fuel is subsequently compressed during the upward movement of the pump piston 18 to a pressure of up to 1800 bar. Upon reaching the upper end position of the pump piston 18, the pressure valve 19 opens and the compressed fuel flows from the cylinder chamber, via a high-pressure line 20, to the common high-pressure accumulator 4. The high-pressure accumulator is introduced from an introduced into the pump housing 1 opening 5 and in the Opening 5 arranged, cup-shaped container 6 is formed. The introduction of the opening 5 can be done in a simple manner by machining, for example by drilling or turning. The adaptation of the high-pressure accumulator volume to different types of engine is effected by the replacement of the cup-shaped container 6. Special refinements of the high-pressure accumulator 4 are shown in more detail in FIGS. 2 to 4 below.

Figur 2 zeigt ein erstes Ausführungsbeispiel eines Kraftstoffhochdruckspeichers 4 wie er in einer Kraftstoffhochdruckpumpe nach Figur 1 ausgebildet sein kann. Der Kraftstoffhochdruckspeicher 4 wird durch eine in das Pumpengehäuse 1 eingebrachte Öffnung 5 und einem in der Öffnung 5 angeordneten topfförmigen Behälter 6 gebildet. Die Öffnung 5 im Pumpengehäuse 1 weist ein Innengewinde 7 auf. Der topfförmige Behälter 6 weist an seiner Mantelfläche ein korrespondierendes Außengewinde 8 auf. Hierdurch kann der topfförmige Behälter 6, auf besonders einfache Weise, in das Pumpengehäuse 1 eingeschraubt werden. Um das Einschrauben zu vereinfachen ist am topfförmige Behälter 4 eine Schlüsselansatz 21 ausgebildet. Die offenen Stirnseite 13 des topfförmigen Behälters ist als ebene Dichtfläche ausgebildet. Die Dichtfläche presst sich beim Einschrauben des topfförmigen Behälters 6, gegen eine korrespondierende Dichtfläche 14, im Pumpengehäuse 1. Hierdurch wird eine Abdichtung des Hochdruckspeichers 4 erzielt. Um zu verhindern, dass ein möglicher Leckagestrom über das Gewinde nach Außen gelangen kann, ist eine ringförmige Entlastungsnut 12 vorgesehen. Die Entlastungsnut 12 ist in der Mantelfläche der Öffnung 5 ausgebildet. Alternativ oder zusätzlich kann auch in der äußeren Mantelfläche des topfförmigen Behälters 6 eine Entlastungsnut ausgebildet sein. Der Leckagestrom von der Entlastungsnut 12, über eine nicht dargestellte Abführleitung, zurück in den Kraftstofftank oder auf die Ansaugseite der Kraftstoffhochdruckpumpe geführt. Hierdurch wird sichergestellt, dass kein Kraftstoff nach außen in die Umgebung gelangen kann.
Der Hochdruckspeicher 4 ist über eine Verbindungsleitung 22 mit der Hochdruckseite der Kraftstoffhochdruckpumpe verbunden. Die Verbindungsleitung 22 mündet in dem gezeigten Ausführungsbeispiel, axial in der Öffnung 5 des Hochdruckspeichers 4. Hierdurch kann die Verbindungsleitung 22 in einem Arbeitsschritt mit der Öffnung 5 gebohrt werden, ohne dass das Pumpengehäuse 1 umgespannt werden muss. Alternativ kann die Verbindungsleitung 22 auch in der Mantelfläche der Öffnung 5, des Druckspeichers 4, mündet.
Vom Hochdruckspeicher beziehungsweise der Verbindungsleitung 22 zweigen eine oder mehrere Leitungen ab, die in einem oder mehreren Hochdruckanschlüssen 23 münden. Die Hochdruckanschlüsse 23 sind mit Leitungen verbindbar, die den Hochdruckspeicher 4 mit den Injektoren einer Brennkraftmaschine verbinden. Dabei ist es möglich, dass von der Kraftstoffhochdruckpumpe nur ein Hochdruckanschluss 23 abzweigt und die Verteilung des Kraftstoffs über einen außerhalb der Pumpe angeordneten Kraftstoffverteiler erfolgt. Oder es sind bereits am Pumpengehäuse 1, eine der Anzahl der Injektoren entsprechende Zahl an Hochdruckanschlüssen 23 ausgebildet, so dass, die einzelnen Leitungen direkt von der Pumpe zu den einzelnen Injektoren geführt werden können.Figure 2 shows a first embodiment of a high-pressure fuel storage 4 as it may be formed in a high-pressure fuel pump of Figure 1. The high-pressure fuel accumulator 4 is formed by an opening 5 introduced into the pump housing 1 and a cup-shaped container 6 arranged in the opening 5. The opening 5 in the pump housing 1 has an internal thread 7. The cup-shaped container 6 has on its lateral surface a corresponding external thread 8. In this way, the cup-shaped container 6, in a particularly simple manner, in the pump housing. 1 be screwed. To simplify screwing in a key-neck 21 is formed on the cup-shaped container 4. The open end 13 of the cup-shaped container is formed as a flat sealing surface. The sealing surface is pressed when screwing the pot-shaped container 6, against a corresponding sealing surface 14, in the pump housing 1. This seals the high-pressure accumulator 4 is achieved. In order to prevent that a possible leakage flow can pass through the thread to the outside, an annular relief groove 12 is provided. The relief groove 12 is formed in the lateral surface of the opening 5. Alternatively or additionally, a relief groove can also be formed in the outer circumferential surface of the cup-shaped container 6. The leakage flow from the relief groove 12, guided via a discharge line, not shown, back into the fuel tank or on the suction side of the high-pressure fuel pump. This ensures that no fuel can escape into the environment.
The high pressure accumulator 4 is connected via a connecting line 22 to the high pressure side of the high-pressure fuel pump. The connecting line 22 opens in the embodiment shown, axially in the opening 5 of the high-pressure accumulator 4. This allows the connecting line 22 to be drilled in one step with the opening 5, without the pump housing 1 must be re-clamped. Alternatively, the connecting line 22 also in the lateral surface of the opening 5, the pressure accumulator 4, opens.
From the high-pressure accumulator or the connecting line 22 branch off one or more lines, which open into one or more high-pressure ports 23. The high-pressure connections 23 can be connected to lines which connect the high-pressure accumulator 4 with the injectors of an internal combustion engine. It is possible that from the high-pressure fuel pump only a high-pressure port 23 branches off and the distribution of the fuel takes place via a fuel distributor arranged outside the pump. Or it is already on the pump housing 1, a number of injectors corresponding number of high-pressure ports 23 are formed so that the individual lines can be performed directly from the pump to the individual injectors.

Figur 3 zeigt ein zweites Ausführungsbeispiels eines Hochdruckspeichers 4 so wie er in einer Hochdruckpumpe nach Figur 1 eingesetzt werden kann. Der Hochdruckspeicher 4 entspricht im wesentlichen dem Hochdruckspeicher wie er bereits in Figur 2 näher beschrieben wurde. Es wird deshalb nachfolgend nur auf die Unterschiede zu diese Ausführungsbeispiel eingegangen.
Der wesentliche Unterschied besteht darin, dass die Mantelfläche 11 des topfförmigen Behälters 6, im Bereich der offenen Stirnseite 13, einen Außenkonus 15 aufweist, der gegen eine, in der Öffnung 5 des Pumpengehäuses 1 ausgebildete, korrespondierende konische Fläche 16 gepresst ist. Die konisch ausgebildeten Flächen 15, 16 dienen dabei zur Abdichtung des Hochdruckspeichers 4. Die konische Ausbildung der Dichtflächen ergibt eine besonders sichere Abdichtung. Besonders vorteilhaft ist es, wenn der topfförmigen Behälters 6, im Bereich des Außenkonus 15, eine verringerte Wandstärke aufweist. Es ersteht dadurch ein leicht elastische zu verformender Außenkonus 15, wodurch auch dann noch eine sichere Abdichtung gewährleistet ist, wenn es zu einem Setzen des Verschraubung kommt.FIG. 3 shows a second exemplary embodiment of a high-pressure accumulator 4 as it can be used in a high-pressure pump according to FIG. The high-pressure accumulator 4 substantially corresponds to the high-pressure accumulator as it has already been described in more detail in Figure 2. It will therefore be discussed below only the differences from this embodiment.
The main difference is that the lateral surface 11 of the cup-shaped container 6, in the region of the open end face 13, an outer cone 15 which is pressed against a, formed in the opening 5 of the pump housing 1, corresponding conical surface 16. The conical surfaces 15, 16 serve to seal the high-pressure accumulator 4. The conical design of the sealing surfaces results in a particularly secure seal. It is particularly advantageous if the pot-shaped container 6, in the region of the outer cone 15, has a reduced wall thickness. It thereby arises a slightly elastic to be deformed outer cone 15, whereby even then a secure seal is ensured when it comes to setting the screw.

Figur 4 zeigt ein drittes Ausführungsbeispiel eines Hochdruckspeichers 4 wie er in der Kraftstoffhochdruckpumpe nach Figur 1 eingesetzt werden kann. Das Ausführungsbeispiel entspricht im wesentlichen dem Ausführungsbeispiel in Figur 3, auf dessen Beschreibung hier verwiesen sei. Im Gegensatz zu diesen Ausführungsbeispielen, weist der Hochdruckspeicher 4 jedoch noch eine zusätzliche Schraubhülse 9 auf, die zwischen dem Pumpengehäuse 1 und dem topfförmigen Behälter 6 angeordnet ist. Die Schraubhülse 9 wird in die Öffnung 5 im Pumpengehäuse 1 eingeschraubt. Die Anzugskraft der Schraube wird, über einen in dem topfförmigen Behälter ausgebildeten Bund 10, auf den topfförmigen Behälter 6 übertragen. Hierdurch wird der in der Mantelfläche des topfförmigen Behälters 6 ausgebildete Außenkonus 15 gegen die in der Öffnung 5 des Pumpengehäuses 1 ausgebildete, korrespondierende konische Fläche 16 gepresst. Die Schraubhülse bietet den Vorteil, dass beim festziehen der Verbindung, nur die Schraubhülse 9 eine Drehbewegung ausführt. Die Konusflächen 15, 16 werden dagegen nur in axialer Richtung aufeinander gepresst. Es kommt dadurch nicht so leicht zu einer Beschädigung der Konusflächen und dadurch zu einer Beschädigung der Abdichtung des Hochdruckspeichers.Figure 4 shows a third embodiment of a high-pressure accumulator 4 as it can be used in the high-pressure fuel pump of Figure 1. The embodiment corresponds essentially the embodiment in Figure 3, whose description is referenced here. In contrast to these embodiments, however, the high-pressure accumulator 4 also has an additional threaded sleeve 9, which is arranged between the pump housing 1 and the cup-shaped container 6. The screw 9 is screwed into the opening 5 in the pump housing 1. The tightening force of the screw is transmitted to the cup-shaped container 6 via a collar 10 formed in the cup-shaped container. As a result, the outer cone 15 formed in the lateral surface of the cup-shaped container 6 is pressed against the corresponding conical surface 16 formed in the opening 5 of the pump housing 1. The screw has the advantage that when tightening the connection, only the screw 9 performs a rotational movement. The conical surfaces 15, 16, however, are pressed against each other only in the axial direction. It is not so easy to damage the conical surfaces and thereby damage the seal of the high-pressure accumulator.

Die Schraubhülse lässt sich sowohl für eine flache, stirnseitige Abdichtung, wie sie in Fig. 2 gezeigt ist, als auch für eine Abdichtung über die Konusdichtflächen nach Fig. 3 und 4 verwenden.The screw sleeve can be used both for a flat, end-side seal, as shown in Fig. 2, as well as for a seal over the Konusdichtflächen according to FIGS. 3 and 4.

Die Erfindung zeichnet sich somit dadurch aus, dass der Hochdruckspeicher 4 auf besonders einfache Weise von einer in das Pumpengehäuse 1 eingebrachte Öffnung 5 und einem in der Öffnung 5 angeordneten, topfförmigen Behälter 6 gebildet wird. Die Öffnung 5 kann dabei durch eine einfache und preiswerte spannende Bearbeitung, beispielsweise durch Bohren oder Drehen, in das Pumpengehäuse 1 eingebracht werden. Das Speichervolumen des Hochdruckspeichers 4 ist durch den einfachen Austausch des topfförmigen Behälters 6 an unterschiedlichen Applikationen anpassbar.The invention is thus characterized by the fact that the high-pressure accumulator 4 is formed in a particularly simple manner by an opening 5 introduced into the pump housing 1 and a pot-shaped container 6 arranged in the opening 5. The opening 5 can be introduced into the pump housing 1 by a simple and inexpensive exciting machining, for example by drilling or turning. The storage volume of the high-pressure accumulator 4 is through the simple exchange the cup-shaped container 6 adapted to different applications.

Claims (7)

  1. High-pressure fuel pump for common-rail injection systems, comprising at least:
    - a pump housing (1), in which a drive shaft (2) is supported,
    - a pump unit (3), which is disposed in the pump housing (1) and is driven by the drive shaft (2) as well as
    - a high-pressure reservoir (4),
    characterised in that
    the high-pressure reservoir (4) is formed by an opening (5) introduced into the pump housing (1) and a pot-shaped container (6) disposed in said opening (5).
  2. High-pressure fuel pump according to claim 1,
    characterised in that
    the opening (5) in the pump housing (1) and the pot-shaped container (6) are configured as cylindrical.
  3. High-pressure fuel pump according to claim 2,
    characterised in that
    the opening (5) in the pump housing (1) has an internal thread (7) and the pot-shaped container (6) has an external thread (8) corresponding to the internal thread (7), such that the pot-shaped container (6) can be screwed into the pump housing (1) .
  4. High-pressure fuel pump according to claim 2,
    characterised in that
    the opening (5) in the pump housing (1) has an internal thread (7), which can be screwed into the internal thread (7) [lacuna] a threaded bush (9), which adjoins a collar (10) of the pot-shaped container (6) and fixes the container (6) in the pump housing (1).
  5. High-pressure fuel pump according to claim 2 or 3,
    characterised in that
    a relief groove (12) is configured in the cylindrical opening (5) in the pump housing (1) and/or on an outer lateral surface (11) of the pot-shaped container (6), by way of which relief groove (12) any leakage flow exiting between the pump housing (1) and the pot-shaped container (6) can be discharged.
  6. High-pressure fuel pump according to one of the preceding claims,
    characterised in that
    an open end face (13) of the pot-shaped container (6) is configured as a sealing surface, which is pressed against a corresponding surface (14) in the pump housing (1), thereby sealing off the high-pressure reservoir (4).
  7. High-pressure fuel pump according to one of claims 1 to 4,
    characterised in that
    a lateral surface (11) of the pot-shaped container (6) in the region of the open end face (13) has an outer cone (15), which is pressed against a corresponding conical surface (16) configured in the opening (5) of the pump housing (1), thereby sealing off the high-pressure reservoir (5).
EP04766829A 2003-12-22 2004-09-21 High-pressure fuel pump for common-rail injection systems Not-in-force EP1704327B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003160534 DE10360534B4 (en) 2003-12-22 2003-12-22 High-pressure fuel pump for common-rail injection systems
PCT/EP2004/052252 WO2005061890A1 (en) 2003-12-22 2004-09-21 High-pressure fuel pump for common-rail injection systems

Publications (2)

Publication Number Publication Date
EP1704327A1 EP1704327A1 (en) 2006-09-27
EP1704327B1 true EP1704327B1 (en) 2007-07-18

Family

ID=34683764

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04766829A Not-in-force EP1704327B1 (en) 2003-12-22 2004-09-21 High-pressure fuel pump for common-rail injection systems

Country Status (3)

Country Link
EP (1) EP1704327B1 (en)
DE (2) DE10360534B4 (en)
WO (1) WO2005061890A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010001252A1 (en) * 2010-01-27 2011-07-28 Robert Bosch GmbH, 70469 Fuel injection system with integrated high-pressure accumulator on a cylinder head
DE102010002291A1 (en) * 2010-02-24 2011-08-25 Robert Bosch GmbH, 70469 High pressure pump and high pressure accumulator
DE102018215132A1 (en) * 2018-09-06 2020-03-12 Ford Global Technologies, Llc High pressure pump for a fuel supply to an internal combustion engine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19747736C1 (en) * 1997-10-29 1999-04-08 Siemens Ag Pressure reservoir for IC engine common-rail fuel injection supply system
JP2001020830A (en) * 1999-07-09 2001-01-23 Usui Internatl Ind Co Ltd High pressure fuel injection pipe for diesel engine
DE10118884A1 (en) * 2001-04-18 2002-11-07 Bosch Gmbh Robert High-pressure fuel pump for a fuel system of a direct-injection internal combustion engine, fuel system and internal combustion engine
JP2002371941A (en) * 2001-06-18 2002-12-26 Denso Corp Fuel injection pump
DE10129449A1 (en) * 2001-06-19 2003-01-02 Bosch Gmbh Robert High-pressure fuel pump for internal combustion engines with improved part-load behavior
ITTO20010968A1 (en) * 2001-10-12 2003-04-12 C R F Societa Con Sortile Per SEALING CONNECTION DEVICE OF A FITTING ON A FUEL INJECTOR FOR ENDOTHERMAL ENGINES.
DE10154645A1 (en) * 2001-11-07 2003-06-12 Siemens Ag Method for producing a fuel storage line with a prestressed connector
DE10228551A1 (en) * 2002-06-26 2004-01-22 Siemens Ag Radial piston pump

Also Published As

Publication number Publication date
DE10360534A1 (en) 2005-07-21
DE502004004401D1 (en) 2007-08-30
WO2005061890A1 (en) 2005-07-07
DE10360534B4 (en) 2007-06-06
EP1704327A1 (en) 2006-09-27

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