EP1131554A1 - High pressure fuel accumulator - Google Patents

High pressure fuel accumulator

Info

Publication number
EP1131554A1
EP1131554A1 EP00978947A EP00978947A EP1131554A1 EP 1131554 A1 EP1131554 A1 EP 1131554A1 EP 00978947 A EP00978947 A EP 00978947A EP 00978947 A EP00978947 A EP 00978947A EP 1131554 A1 EP1131554 A1 EP 1131554A1
Authority
EP
European Patent Office
Prior art keywords
base body
pressure fuel
fuel accumulator
interior
tubular base
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
EP00978947A
Other languages
German (de)
French (fr)
Other versions
EP1131554B1 (en
Inventor
Kurt Frank
Friedrich Boecking
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 EP1131554A1 publication Critical patent/EP1131554A1/en
Application granted granted Critical
Publication of EP1131554B1 publication Critical patent/EP1131554B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails

Definitions

  • the invention relates to a high-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine, having a tubular base body, the interior of which is connected to a plurality of connection openings.
  • a high pressure pump possibly with the aid of a prefeed pump, conveys the fuel to be injected from a tank to the central high pressure fuel reservoir, which is referred to as the common rail. Lead from the rail
  • High-pressure fuel stores are the generation of pressure and
  • a conventional high-pressure fuel accumulator is described, for example, in DE 195 48 611.
  • the well-known high-pressure fuel reservoir holds pressures of up to about 1100 bar.
  • the object of the invention is to increase the high-pressure strength of the known high-pressure fuel reservoir with simple measures.
  • the Kraf high-pressure accumulator according to the invention in particular also in different versions, should be inexpensive to manufacture.
  • a high-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine with a tubular base body, the interior of which is connected to a plurality of connection openings, in that the interior is arranged eccentrically in the base body with respect to the longitudinal axis of the base body ,
  • High-pressure strength of the high-pressure fuel reservoir is primarily limited by the intersections between the connection openings and the base body. In operation, large forces act on the transitions between the connection openings and the base body. The relative displacement of the interior in a first plane of the base body relieves or stabilizes the transition area of the intersections which is at risk of breakage. The high-pressure strength of the high-pressure fuel reservoir is increased. The critical areas between the connection openings and the base body can be defused by rounding.
  • a special embodiment of the invention is characterized in that the interior of the base body is arranged in the base body such that the connection openings open tangentially into the interior of the base body.
  • the connection openings are usually made
  • the high-pressure strength of the high-pressure fuel accumulator according to the invention is further increased by a relative displacement of the interior in the base body in a second plane, which is arranged perpendicular to the first plane.
  • a further special embodiment of the invention is characterized in that the base body has a substantially elliptical outer contour in cross-section, and that the connection openings are arranged in the longitudinal direction of the main axis of the ellipse.
  • the essentially elliptical outer contour leads to the interior of the tubular base body expanding transversely to the main axis of the ellipse.
  • the resulting expansion in the base body ensures that the area of the intersections that is at risk of breakage is relieved.
  • the high-pressure strength of the high-pressure fuel reservoir according to the invention is further increased.
  • a further special embodiment of the invention is characterized in that the base body has an essentially circular outer contour in cross section with two flats which, viewed in cross section, are arranged on both sides of the longitudinal axis of the respective connection openings.
  • the flats lead to an outer contour, which provides the same advantages as the elliptical outer contour.
  • the interior of the tubular base body expands transversely to the longitudinal axis of the respective connection openings when subjected to high pressure. The resulting expansion in the base body ensures that the area of the intersections that is at risk of breakage is relieved. As a result, the high-pressure strength of the high-pressure fuel reservoir according to the invention is further increased elevated .
  • a further special embodiment of the invention is characterized in that a volume accumulator is arranged eccentrically to the interior of the base body at at least one end of the interior of the tubular base body.
  • the additional volume storage increases the capacity of the high-pressure fuel storage according to the invention.
  • a further special embodiment of the invention is characterized in that the volume storage device is closed by a cover at the end of the interior of the tubular base body.
  • the cover can, for example, be fastened to the tubular base body with the aid of a screw and / or welded connection.
  • Recesses are formed.
  • the recesses provide the advantage that the weight of the high-pressure fuel reservoir according to the invention is reduced.
  • the recesses can be worked into the outer contour of the tubular base body, for example, by turning or milling.
  • the fastening elements serve to fasten the high-pressure fuel reservoir according to the invention to the internal combustion engine.
  • the fastening elements can be, for example, fastening lugs with a screw-in thread or a pressed-in one Act attachment eye.
  • the fasteners can also be welded between the connection openings.
  • the base body is formed from a drawn starting material.
  • the drawn starting material provides the advantage that the high-pressure fuel reservoir according to the invention is modular and flexible in terms of the screw-on geometry.
  • Base bodies of any length can be manufactured without fixed tools such as forging molds.
  • the manufacturing costs are reduced because the starting material can be easily procured and no special devices are required for each variant of the high-pressure fuel accumulator according to the invention.
  • the first embodiment of a high-pressure fuel accumulator according to the invention shown in FIG. 1 comprises a tubular base body 1.
  • the longitudinal axis of the tubular base body 1 is designated by 2.
  • an axial bore 3 extends parallel to the longitudinal axis 2.
  • the center line 4 of the axial bore 3 is spaced a distance Y from the longitudinal axis 2 of the tubular base body 1.
  • the axial bore 3 is arranged eccentrically in the tubular base body 1.
  • connection bores 5 and 6 open into the axial bore 3 of the tubular base body 1.
  • the connection bores 5 and 6 are arranged radially in the tubular base body 1 and expand towards the outside. In the expanded outer area, the connection bores 5 and 6 are each provided with an internal thread.
  • a recess 7 is provided in the tubular base body 1 between the connection bores 5 and 6. The recess 7 serves to reduce the weight of the high-pressure fuel accumulator according to the invention.
  • the axial bore 3 opens at one end of the tubular
  • the volume memory 8 is formed by a cylindrical recess in the tubular base body 1.
  • the cylindrical recess 8 is arranged concentrically to the longitudinal axis 2 of the tubular base body 1.
  • the cylindrical recess 8 arranged eccentrically to the axial bore 3 in the tubular base body 1.
  • the volume storage 8 is closed by a cover 9 in a pressure-tight manner.
  • the eccentric displacement of the axial bore 3 by the dimension Y relieves the fracture-prone region 10, which is generally mechanically rounded, of the stresses that occur.
  • the area 11 without geometric disturbance is not at risk of breakage and is dimensioned according to the known rules of mechanical engineering for pipes subject to internal pressure.
  • FIG. 2 shows a second embodiment of a high-pressure fuel accumulator according to the invention in cross section. The one shown in Fig. 2
  • High-pressure fuel accumulator comprises a tubular base body 21.
  • the longitudinal axis 22 of the tubular base body 21 extends perpendicular to the plane of the drawing.
  • An axial bore 23 is arranged in the tubular base body 21 parallel to the longitudinal axis 22 of the tubular base body 21.
  • the center line of the axial bore 23 is designated 24.
  • connection bore 25 opens tangentially into the axial bore 23 of the tubular base body 21
  • the center line 24 of the axial bore 23 is spaced on the one hand by the dimension X from the center line of the radial connection bore 25 and on the other hand by the dimension Y of the longitudinal axis 22 of the tubular base body 21.
  • the axial bore 23 is thus arranged eccentrically in two planes.
  • the eccentricity Y relieves or stabilizes the critical region 30.
  • the eccentricity X also ensures that the connection bore 25 opens tangentially into the axial bore 23.
  • 3 shows a third embodiment of a high-pressure fuel accumulator according to the invention in cross section.
  • the high-pressure fuel reservoir shown in FIG. 3 comprises a tubular base body 31 with an outer contour that is elliptical in cross section.
  • the main axis of the ellipse is arranged perpendicular to the longitudinal axis 32 of the tubular base body 31.
  • the main axis of the ellipse coincides with the center line of a connection bore 35 which is arranged radially in the tubular base body 31.
  • the radial connection bore 35 opens into an axial bore 33 in the tubular base body 31, the center line of which is designated by 34.
  • the center line 34 of the axial bore 33 runs parallel to the longitudinal axis 32 of the tubular base body 31.
  • the expansion of the tubular base body 31 under high pressure is indicated by a dashed ellipse 36.
  • the strains that occur during operation relieve the fracture-prone area 40 of the transition between the
  • FIG. 4 shows a fourth embodiment of a high-pressure fuel accumulator according to the invention in cross section.
  • a tubular base body 41 the longitudinal axis of which is designated 42
  • an axial bore 43 is recessed.
  • the axial bore 43 is spaced a distance Y from the longitudinal axis 42 of the tubular base body 41.
  • a radial connection bore 45 opens into the axial bore 43.
  • the tubular base body 41 has a circular outer contour.
  • Flat lines are indicated by dashed lines 46 and 47, which, viewed in cross section, are arranged on both sides of the connection bore 45.
  • the flats 46, 47 have the same effect as achieved by the elliptical outer contour of the embodiment shown in FIG. 3.

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 high pressure fuel accumulator for a common rail injection system of an internal combustion engine, comprising a tubular base body (1) whose inner volume (3) is linked to several connector openings (5, 6). To increase the resistance to high pressure, the inner volume (3) is arranged eccentrically with regard to the longitudinal axis (2) of the base body (1).

Description

KraftstoffhochdruckspeicherHigh-pressure fuel storage
Stand der TechnikState of the art
Die Erfindung betrifft einen Kraftstoffhochdruckspeicher für ein Common-Rail-Kraftstoffeinspritzsystem einer Brennkraftmaschine, mit einem rohrförmigen Grundkörper, dessen Innenraum mit mehreren Anschlussöffnungen in Verbindung steht.The invention relates to a high-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine, having a tubular base body, the interior of which is connected to a plurality of connection openings.
In Common-Rail-Einspritzsystemen fördert eine Hochdruckpumpe, eventuell unter Zufhilfenahme einer Vorförderpumpe , den einzuspritzenden Kraftstoff aus einem Tank in den zentralen Kraftstoffhochdruckspeicher , der als Common-Rail bezeichnet wird. Von dem Rail führenIn common rail injection systems, a high pressure pump, possibly with the aid of a prefeed pump, conveys the fuel to be injected from a tank to the central high pressure fuel reservoir, which is referred to as the common rail. Lead from the rail
Kraftstoffleitungen zu den einzelnen Injektoren, die den Zylindern der Brennkraftmaschine zugeordnet sind. Die Injektoren werden in /Abhängigkeit von den Betriebsparametern der Brennkraftmaschine einzeln von der Motorelektronik angesteuert, um Kraftstoff in den Brennraum der Brennkraftmaschine einzuspritzen. Durch denFuel lines to the individual injectors that are assigned to the cylinders of the internal combustion engine. Depending on the operating parameters of the internal combustion engine, the injectors are individually controlled by the engine electronics in order to inject fuel into the combustion chamber of the internal combustion engine. By the
Kraftstoffhochdruckspeicher sind die Druckerzeugung und dieHigh-pressure fuel stores are the generation of pressure and
Einspritzung voneinander entkoppelt .Injection decoupled from each other.
Ein herkömmlicher Kraftstoffhochdruckspeicher ist z.B. in der DE 195 48 611 beschrieben. Der bekannte Kraftstoffhochdruckspeicher hält Drücke von bis zu etwa 1100 bar aus .A conventional high-pressure fuel accumulator is described, for example, in DE 195 48 611. The well-known high-pressure fuel reservoir holds pressures of up to about 1100 bar.
Aufgabe der Erfindung ist es, die Hochdruckfestigkeit des bekannten Kraftstoffhochdruckspeichers mit einfachen Maßnahmen zu erhöhen. Darüber hinaus soll der erfindungsgemäße Kraf stoffhochdruckspeicher, insbesondere auch in unterschiedlichen Ausführungen, kostengünstig herstellbar sein.The object of the invention is to increase the high-pressure strength of the known high-pressure fuel reservoir with simple measures. In addition, the Kraf high-pressure accumulator according to the invention, in particular also in different versions, should be inexpensive to manufacture.
Die Aufgabe ist bei einem Kraftstoffhochdruckspeicher für ein Common-Rail -Kraftstoffeinspritzsystem einer Brennkraftmaschine, mit einem rohrförmigen Grundkörper, dessen Innenraum mit mehreren Anschlussöffnungen in Verbindung steht, dadurch gelöst, dass der Innenraum, bezogen auf die Längsachse des Grundkörpers, exzentrisch in dem Grundkörper angeordnet ist. Im Rahmen der vorliegenden Erfindung hat sich herausgestellt, dass dieThe object is achieved in a high-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine with a tubular base body, the interior of which is connected to a plurality of connection openings, in that the interior is arranged eccentrically in the base body with respect to the longitudinal axis of the base body , In the context of the present invention, it has been found that the
Hochdruckfestigkeit des Kraftstoffhochdruckspeichers primär durch die Verschneidungen zwischen den Anschlussöffnungen und dem Grundkörper beschränkt wird. Auf die Übergänge zwischen den Anschlussöffnungen und dem Grundkörper wirken im Betrieb große Kräfte. Durch die relative Verschiebung des Innenraums in einer ersten Ebene des Grundkörpers wird der bruchgefährdete Übergangsbereich der Verschneidungen entlastet bzw. stabilisiert. Die Hochdruckfestigkeit des Kraftstoffhochdruckspeichers wird gesteigert. Durch Verrunden können die kritischen Bereiche zwischen den Anschlussöffnungen und dem Grundkörper noch entschärft werden.High-pressure strength of the high-pressure fuel reservoir is primarily limited by the intersections between the connection openings and the base body. In operation, large forces act on the transitions between the connection openings and the base body. The relative displacement of the interior in a first plane of the base body relieves or stabilizes the transition area of the intersections which is at risk of breakage. The high-pressure strength of the high-pressure fuel reservoir is increased. The critical areas between the connection openings and the base body can be defused by rounding.
Eine besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass der Innenraum des Grundkörpers so in dem Grundkörper angeordnet ist, dass die Anschlussöffnungen tangential in den Innenraum des Grundkörpers münden. Die Anschlussöffnungen sind in der Regel ausA special embodiment of the invention is characterized in that the interior of the base body is arranged in the base body such that the connection openings open tangentially into the interior of the base body. The connection openings are usually made
Festigkeitsgründen, im Querschnitt betrachtet, mittig in dem rohrförmigen Grundkörper angeordnet. Durch eine relative Verschiebung des Innenraums in dem Grundkörper in einer zweiten Ebene, die senkrecht zu der ersten Ebene angeordnet ist, wird die Hochdruckfestigkeit des erfindungsgemäßen Kraftstoffhochdruckspeichers weiter erhöht .Strength reasons, viewed in cross-section, in the middle in arranged the tubular base body. The high-pressure strength of the high-pressure fuel accumulator according to the invention is further increased by a relative displacement of the interior in the base body in a second plane, which is arranged perpendicular to the first plane.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass der Grundkörper im Querschnitt eine im Wesentlichen ellipsenförmige Außenkontur aufweist, und dass die Anschlussöffnungen in Längsrichtung der Hauptachse der Ellipse angeordnet sind. Die im Wesentlichen ellipsenförmige Außenkontur führt unter Hochdruckbeaufschlagung des Innenraums des rohrförmigen Grundkörpers dazu, dass sich der Innenraum des rohrförmigen Grundkörpers quer zur Hauptachse der Ellipse ausdehnt. Die daraus resultierenden Dehnungen im Grundkörper sorgen dafür, dass der bruchgefährdete Bereich der Verschneidungen entlastet wird. Dadurch wird die Hochdruckfestigkeit des erfindungsgemäßen Kraftstoffhochdruckspeichers weiter erhöht .A further special embodiment of the invention is characterized in that the base body has a substantially elliptical outer contour in cross-section, and that the connection openings are arranged in the longitudinal direction of the main axis of the ellipse. When the interior of the tubular base body is subjected to high pressure, the essentially elliptical outer contour leads to the interior of the tubular base body expanding transversely to the main axis of the ellipse. The resulting expansion in the base body ensures that the area of the intersections that is at risk of breakage is relieved. As a result, the high-pressure strength of the high-pressure fuel reservoir according to the invention is further increased.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass der Grundkörper im Querschnitt eine im Wesentlichen kreisförmige Außenkontur mit zwei Abflachungen aufweist, die, im Querschnitt betrachtet, beidseitig der Längsachse der jeweiligen Anschlussöffnungen angeordnet sind. Die Abflachungen führen zu einer Außenkontur, welche die gleichen Vorteile liefert wie die ellipsenförmige Außenkontur. Der Innenraum des rohrförmigen Grundkörpers dehnt sich unter Hochdruckbeaufschlagung quer zur Längsachse der jeweiligen Anschlussöffnungen aus. Die daraus resultierenden Dehnungen im Grundkörper sorgen dafür, dass der bruchgefährdete Beeich der Verschneidungen entlastet wird. Dadurch wird die Hochdruckfestigkeit des erfindungsgemäßen Kraftstoffhochdruckspeichers weiter erhöht .A further special embodiment of the invention is characterized in that the base body has an essentially circular outer contour in cross section with two flats which, viewed in cross section, are arranged on both sides of the longitudinal axis of the respective connection openings. The flats lead to an outer contour, which provides the same advantages as the elliptical outer contour. The interior of the tubular base body expands transversely to the longitudinal axis of the respective connection openings when subjected to high pressure. The resulting expansion in the base body ensures that the area of the intersections that is at risk of breakage is relieved. As a result, the high-pressure strength of the high-pressure fuel reservoir according to the invention is further increased elevated .
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass an mindestens einem Ende des Innenraums des rohrförmigen Grundkörpers ein Volumenspeicher exzentrisch zu dem Innenraum des Grundkörpers angeordnet ist. Durch den zusätzlichen Volumenspeicher wird die Aufnahmekapazität des erfindungsgemäßen Kraftstoffhochdruckspeichers erhöht.A further special embodiment of the invention is characterized in that a volume accumulator is arranged eccentrically to the interior of the base body at at least one end of the interior of the tubular base body. The additional volume storage increases the capacity of the high-pressure fuel storage according to the invention.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass der Volumenspeicher am Ende des Innenraums des rohrförmigen Grundkörpers durch einen Deckel verschlossen ist. Der Deckel kann beispielsweise mit Hilfe einer Schraub- und/oder Schweißverbindung an dem rohrförmigen Grundkörper befestigt sein.A further special embodiment of the invention is characterized in that the volume storage device is closed by a cover at the end of the interior of the tubular base body. The cover can, for example, be fastened to the tubular base body with the aid of a screw and / or welded connection.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass zwischen den Anschlussöffnungen in dem rohrförmigen GrundkörperAnother special embodiment of the invention is characterized in that between the connection openings in the tubular base body
Ausnehmungen ausgebildet sind. Die Ausnehmungen liefern den Vorteil, dass das Gewicht des erfindungsgemäßen Kraftstoffhochdruckspeichers verringert wird. Die Ausnehmungen können beispielsweise durch Drehen oder Fräsen in die Außenkontur des rohrförmigen Grundkörpers eingearbeitet werden.Recesses are formed. The recesses provide the advantage that the weight of the high-pressure fuel reservoir according to the invention is reduced. The recesses can be worked into the outer contour of the tubular base body, for example, by turning or milling.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass zwischen den Anschlussöffnungen in dem rohrförmigen GrundkörperAnother special embodiment of the invention is characterized in that between the connection openings in the tubular base body
Befestigungselemente vorgesehen sind. Die Befestigungselemente dienen zur Befestigung des erfindungsgemäßen Kraftstoffhochdruckspeichers an der Brennkraftmaschine. Bei den Befestigungselementen kann es sich z.B. um Befestigungslaschen mit einem Einschraubgewinde oder um ein eingepresstes Befestigungsauge handeln. Die Befestigungselemente können aber auch zwischen den Anschlussöffnungen angeschweißt sein .Fasteners are provided. The fastening elements serve to fasten the high-pressure fuel reservoir according to the invention to the internal combustion engine. The fastening elements can be, for example, fastening lugs with a screw-in thread or a pressed-in one Act attachment eye. The fasteners can also be welded between the connection openings.
Eine weitere besondere Ausführungsart der Erfindung ist dadurch gekennzeichnet, dass der Grundkörper aus einem gezogenen Ausgangsmaterial gebildet ist. Das gezogene Ausgangsmaterial liefert den Vorteil, dass der erfindungsgemäße Kraftstoffhochdruckspeicher baukastengeeignet und flexibel in der Anschraubgeometrie ist. Beliebig lange Grundkörper können ohne feste Werkzeuge, wie Schmiedeformen, gefertigt werden. Darüber hinaus werden die Herstellkosten gesenkt, da das Ausgangsmaterial gut beschaffbar ist und keine Sondereinrichtungen für jede Variante des erfindungsgemäßen Kraftstoffhochdruckspeichers erforderlich sind.Another special embodiment of the invention is characterized in that the base body is formed from a drawn starting material. The drawn starting material provides the advantage that the high-pressure fuel reservoir according to the invention is modular and flexible in terms of the screw-on geometry. Base bodies of any length can be manufactured without fixed tools such as forging molds. In addition, the manufacturing costs are reduced because the starting material can be easily procured and no special devices are required for each variant of the high-pressure fuel accumulator according to the invention.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung verschiedeneFurther advantages, features and details of the invention will become apparent from the following description, in which various with reference to the drawing
Ausführungsbeispiele der Erfindung im Einzelnen beschrieben sind. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein. In der Zeichnung zeigen:Embodiments of the invention are described in detail. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination. The drawing shows:
Fig. 1: eine erste Ausführungsform eines erfindungsgemäßen Kraftstoffhochdruckspeichers im Längsschnitt ;1: a first embodiment of a high-pressure fuel accumulator according to the invention in longitudinal section;
Fig. 2: eine zweite Ausführungsform eines erfindungsgemäßen Kraftstoffhochdruckspeichers im Querschnitt;2: a second embodiment of a high-pressure fuel accumulator according to the invention in cross section;
Fig. 3: eine dritte Ausführungsform eines erfindungsgemäßen Kraftstoffhochdruckspeichers im Querschnitt mit einer ellipsenförmigen Außenkontur; und3: a third embodiment of a high-pressure fuel reservoir according to the invention in Cross section with an elliptical outer contour; and
Fig. 4: eine vierte Ausführungsform eines erfindungsgemäßen Kraftstoffhochdruckspeichers im Querschnitt mit zwei seitlichen Abflachungen.4: a fourth embodiment of a high-pressure fuel accumulator according to the invention in cross section with two lateral flats.
Die in Fig. 1 dargestellte erste Ausführungsform eines erfindungsgemäßen Kraftstoffhochdruckspeichers umfasst einen rohrförmigen Grundkörper 1. Die Längsachse des rohrförmigen Grundkörpers 1 ist mit 2 bezeichnet. In dem rohrförmigen Grundkörper 1 erstreckt sich eine axiale Bohrung 3 parallel zur Längsachse 2. Die Mittellinie 4 der axialen Bohrung 3 ist um den Abstand Y von der Längsachse 2 des rohrförmigen Grundkörpers 1 beabstandet . Mit anderen Worten: Die axiale Bohrung 3 ist exzentrisch in dem rohrförmigen Grundkörper 1 angeordnet .The first embodiment of a high-pressure fuel accumulator according to the invention shown in FIG. 1 comprises a tubular base body 1. The longitudinal axis of the tubular base body 1 is designated by 2. In the tubular base body 1, an axial bore 3 extends parallel to the longitudinal axis 2. The center line 4 of the axial bore 3 is spaced a distance Y from the longitudinal axis 2 of the tubular base body 1. In other words: the axial bore 3 is arranged eccentrically in the tubular base body 1.
In die axiale Bohrung 3 des rohrförmigen Grundkörpers 1 münden zwei Anschlussbohrungen 5 und 6. Die Anschlussbohrungen 5 und 6 sind radial in dem rohrförmigen Grundkörper 1 angeordnet und erweitern sich nach außen hin. In dem erweiterten äußeren Bereich sind die Anschlussbohrungne 5 und 6 jeweils mit einem Innengewinde versehen. Zwischen den Anschlussbohrungen 5 und 6 ist in dem rohrförmigen Grundkörper 1 eine Ausnehmung 7 vorgesehen. Die Ausnehmung 7 dient dazu, das Gewicht des erfindungsgemäßen Kraftstoffhochdruckspeichers zu reduzieren.Two connection bores 5 and 6 open into the axial bore 3 of the tubular base body 1. The connection bores 5 and 6 are arranged radially in the tubular base body 1 and expand towards the outside. In the expanded outer area, the connection bores 5 and 6 are each provided with an internal thread. A recess 7 is provided in the tubular base body 1 between the connection bores 5 and 6. The recess 7 serves to reduce the weight of the high-pressure fuel accumulator according to the invention.
Die axiale Bohrung 3 mündet an einem Ende des rohrförmigenThe axial bore 3 opens at one end of the tubular
Grundkörpers 1 in einen Volumenspeicher 8. Der Volumenspeicher 8 wird von einer zylinderförmigen Ausnehmung in dem rohrförmigen Grundkörper 1 gebildet. Die zylinderförmige Ausnehmung 8 ist konzentrisch zu der Längsachse 2 des rohrförmigen Grundkörpers 1 angeordnet. Gleichzeitig ist die zylinderförmige Ausnehmung 8 exzentrisch zu der axialen Bohrung 3 in dem rohrförmigen Grundkörper 1 angeordnet. Der Volumenspeicher 8 ist durch einen Deckel 9 hochdruckdicht verschlossen.Base body 1 in a volume memory 8. The volume memory 8 is formed by a cylindrical recess in the tubular base body 1. The cylindrical recess 8 is arranged concentrically to the longitudinal axis 2 of the tubular base body 1. At the same time, the cylindrical recess 8 arranged eccentrically to the axial bore 3 in the tubular base body 1. The volume storage 8 is closed by a cover 9 in a pressure-tight manner.
Durch die exzentrische Verschiebung der axialen Bohrung 3 um das Maß Y wird der bruchgefährdete Bereich 10, der in der Regel mechanisch verrundet ist, von den auftretenden Spannungen entlastet. Der Bereich 11 ohne geometrische Störung ist bezüglich Bruch nicht gefährdet und wird gemäß den bekannten Regeln des Maschinenbaus für innendruckbelastete Rohre dimensioniert.The eccentric displacement of the axial bore 3 by the dimension Y relieves the fracture-prone region 10, which is generally mechanically rounded, of the stresses that occur. The area 11 without geometric disturbance is not at risk of breakage and is dimensioned according to the known rules of mechanical engineering for pipes subject to internal pressure.
In Fig. 2 ist eine zweite Ausführungsform eines erfindungsgemäßen Kraftstoffhochdruckspeichers im Querschnitt dargestellt. Der in Fig. 2 dargestellte2 shows a second embodiment of a high-pressure fuel accumulator according to the invention in cross section. The one shown in Fig. 2
Kraftstoffhochdruckspeicher umfasst einen rohrfömrigen Grundkörper 21. Die Längsachse 22 des rohrförmigen Grundkörpers 21 verläuft senkrecht zur Zeichenebene. In dem rohrförmigen Grundkörper 21 ist eine axiale Bohrung 23 parallel zur Längsachse 22 des rohrförmigen Grundkörpers 21 angeordnet. Die Mittellinie der axialen Bohrung 23 ist mit 24 bezeichnet.High-pressure fuel accumulator comprises a tubular base body 21. The longitudinal axis 22 of the tubular base body 21 extends perpendicular to the plane of the drawing. An axial bore 23 is arranged in the tubular base body 21 parallel to the longitudinal axis 22 of the tubular base body 21. The center line of the axial bore 23 is designated 24.
Eine Anschlussbohrung 25 mündet tangential in die axiale Bohrung 23 des rohrförmigen Grundkörpers 21. Wie man inA connection bore 25 opens tangentially into the axial bore 23 of the tubular base body 21
Fig. 2 sieht, ist die Mittellinie 24 der axialen Bohrung 23 einerseits um das Maß X von der Mittellinie der radialen Anschlussbohrung 25 und andererseits um das Maß Y von der Längsachse 22 des rohrförmigen Grundkörpers 21 beabstandet. Die axiale Bohrung 23 ist also in zwei Ebenen exzentrisch angeordnet. Durch die Exzentrizität Y wird, wie bereits bei der in Fig. 1 dargstellten Ausführungsform erläutert, der kritische Bereich 30 entlastet bzw. stabilisiert. Durch die Exzentrizität X wird darüber hinaus erreicht, dass die Anschlussbohrung 25 tangential in die axiale Bohrung 23 mündet . In Fig. 3 ist eine dritte Ausführungsform eines erfindungsgemäßen Krafstoffhochdruckspeichers im Querschnitt dargestellt. Der in Fig. 3 dargestellte Kraftstoffhochdruckspeicher umfasst einen rohrförmigen Grundkörper 31 mit einer im Querschnitt ellipsenförmigen Außenkontur. Die Hauptachse der Ellipse ist senkrecht zu der Längsachse 32 des rohrförmigen Grundkörpers 31 angeordnet. Die Hauptachse der Ellipse fällt mit der Mittellinie einer Anschlussbohrung 35 zusammen, die radial in dem rohrförmigen Grundkörper 31 angeordnet ist. Die radiale Anschlussbohrung 35 mündet in eine axiale Bohrung 33 in dem rohrförmigen Grundkörper 31, deren Mittellinie mit 34 bezeichnet ist. Die Mittellinie 34 der axialen Bohrung 33 verläuft parallel zu der Längsachse 32 des rohrförmigen Grundkörpers 31.2, the center line 24 of the axial bore 23 is spaced on the one hand by the dimension X from the center line of the radial connection bore 25 and on the other hand by the dimension Y of the longitudinal axis 22 of the tubular base body 21. The axial bore 23 is thus arranged eccentrically in two planes. As already explained in the embodiment shown in FIG. 1, the eccentricity Y relieves or stabilizes the critical region 30. The eccentricity X also ensures that the connection bore 25 opens tangentially into the axial bore 23. 3 shows a third embodiment of a high-pressure fuel accumulator according to the invention in cross section. The high-pressure fuel reservoir shown in FIG. 3 comprises a tubular base body 31 with an outer contour that is elliptical in cross section. The main axis of the ellipse is arranged perpendicular to the longitudinal axis 32 of the tubular base body 31. The main axis of the ellipse coincides with the center line of a connection bore 35 which is arranged radially in the tubular base body 31. The radial connection bore 35 opens into an axial bore 33 in the tubular base body 31, the center line of which is designated by 34. The center line 34 of the axial bore 33 runs parallel to the longitudinal axis 32 of the tubular base body 31.
Durch eine gestrichelt dargestellte Ellipse 36 ist die Ausdehnung des rohrförmigen Grundkörpers 31 unter Hochdruck angedeutet. Die auftretenden Dehnungen im Betrieb entlasten den bruchgefährdeten Bereich 40 des Übergangs zwischen derThe expansion of the tubular base body 31 under high pressure is indicated by a dashed ellipse 36. The strains that occur during operation relieve the fracture-prone area 40 of the transition between the
Anschlussbohrung 35 und der axialen Bohrung 33.Connection bore 35 and the axial bore 33.
In Fig. 4 ist eine vierte Ausführungsform eines erfindungsgemäßen Kraftstoffhochdruckspeichers im Querschnitt dargestellt. In einem rohrförmigen Grundkörper 41, dessen Längsachse mit 42 bezeichnet ist, ist eine axiale Bohrung 43 ausgespart. Die axiale Bohrung 43 ist um den Abstand Y von der Längsachse 42 des rohrförmigen Grundkörpers 41 beabstandet. Eine radiale Anschlussbohrung 45 mündet in die axiale Bohrung 43.4 shows a fourth embodiment of a high-pressure fuel accumulator according to the invention in cross section. In a tubular base body 41, the longitudinal axis of which is designated 42, an axial bore 43 is recessed. The axial bore 43 is spaced a distance Y from the longitudinal axis 42 of the tubular base body 41. A radial connection bore 45 opens into the axial bore 43.
Der rohrförmige Grundkörper 41 hat eine kreisförmige Außenkontur. Durch gestrichelte Linien 46 und 47 sind Abflachungen angedeutet, die, im Querschnitt betrachtet, zu beiden Seiten der Anschlussbohrung 45 angeordnet sind.The tubular base body 41 has a circular outer contour. Flat lines are indicated by dashed lines 46 and 47, which, viewed in cross section, are arranged on both sides of the connection bore 45.
Durch die Abflachungen 46, 47 wird die gleiche Wirkung wie durch die ellipsenförmige Außenkontur der in Fig. 3 dargestellten Ausführungsform erreicht. The flats 46, 47 have the same effect as achieved by the elliptical outer contour of the embodiment shown in FIG. 3.

Claims

Ansprüche Expectations
1. Kraftstoffhochdruckspeicher für ein Common-Rail-1. High-pressure fuel accumulator for a common rail
Kraftstoffeinspritzsystem einer Brennkraftmaschine, mit einem rohrförmigen Grundkörper (1; 21; 31; 41), dessen Innenraum (3; 23; 33; 43) mit mehreren Anschlussöffnungen (5, 6; 25; 35; 45) in Verbindung steht, dadurch gekennzeichnet, dass der Innenraum (3; 23; 33; 43) bezogen auf die Längsachse (2; 22; 32; 42) des Grundkörpers (1; 21; 31; 41) exzentrisch angeordnet ist.Fuel injection system of an internal combustion engine, with a tubular base body (1; 21; 31; 41), the interior (3; 23; 33; 43) of which is connected to a plurality of connection openings (5, 6; 25; 35; 45), characterized in that that the interior (3; 23; 33; 43) is arranged eccentrically with respect to the longitudinal axis (2; 22; 32; 42) of the base body (1; 21; 31; 41).
2. Kraftstoffhochdruckspeicher nach Anspruch 1, dadurch gekennzeichnet, dass der Innenraum (23) des Grundkörpers (21) so angeordnet ist, dass die Anschlussöffnungen (25) tangential in den Innenraum (23) des Grundkörpers (21) münden .2. High-pressure fuel accumulator according to claim 1, characterized in that the interior (23) of the base body (21) is arranged such that the connection openings (25) open tangentially into the interior (23) of the base body (21).
3. Kraftstoffhochdruckspeicher nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Grundkörper (31) im Querschnitt eine im Wesentlichen ellipsenförmige Außenkontur aufweist, und dass die Anschlussöffnungen (35) in Längsrichtung der Hauptachse der Ellipse angeordnet sind.3. High-pressure fuel accumulator according to one of the preceding claims, characterized in that the base body (31) has a substantially elliptical outer contour in cross section, and that the connection openings (35) are arranged in the longitudinal direction of the main axis of the ellipse.
4. Kraftstoffhochdruckspeicher nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Grundkörper (41) im Querschnitt eine im Wesentlichen kreisförmige Außenkontur mit zwei Abflachungen (46, 47) aufweist, die, im4. High-pressure fuel accumulator according to claim 1 or 2, characterized in that the base body (41) in cross section has a substantially circular outer contour with two flats (46, 47) which, in
Querschnitt betrachtet, beidseitig der Längsachse der jeweiligen Anschlussöffnung (45) angeordnet sind.Cross section viewed on both sides of the longitudinal axis of the respective connection opening (45) are arranged.
5. Kraftstoffhochdruckspeicher nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass an mindestens einem Ende des Innenraums (3) des rohrförmigen5. High-pressure fuel accumulator according to one of the preceding claims, characterized in that at least one end of the interior (3) of the tubular
Grundkörpers (1) ein Volumenspeicher (8) exzentrisch zu dem Innenraum (3) des Grundkörpers (1) angeordnet ist.Base body (1) a volume storage (8) is arranged eccentrically to the interior (3) of the base body (1).
6. Kraftstoffhochdruckspeicher nach Anspruch 5, dadurch gekennzeichnet, dass der Volumenspeicher (8) am Ende des6. High-pressure fuel accumulator according to claim 5, characterized in that the volume accumulator (8) at the end of
Innenraums (3) des rohrförmigen Grundkörpers (1) durch einen Deckel (9) verschlossen ist.Interior (3) of the tubular base body (1) is closed by a cover (9).
7. Kraftstoffhochdruckspeicher nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen den Anschlussöffnungen (5, 6) in dem rohrförmigen Grundkörper (1) Ausnehmungen (7) ausgebildet sind.7. High-pressure fuel accumulator according to one of the preceding claims, characterized in that recesses (7) are formed between the connection openings (5, 6) in the tubular base body (1).
8. Kraftstoffhochdruckspeicher nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass zwischen den8. High-pressure fuel accumulator according to one of claims 1 to 6, characterized in that between the
Anschlussöffnungen (5, 6) in dem rohrförmigen Grundkörper Befestigungselemente vorgesehen sind.Connection openings (5, 6) fastening elements are provided in the tubular base body.
9. Kraftstoffhochdruckspeicher nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet dass der Grundkörper (1; 21; 31; 41) aus einem gezogenen Ausgangsmaterial gebildet ist. 9. High-pressure fuel accumulator according to one of the preceding claims, characterized in that the base body (1; 21; 31; 41) is formed from a drawn starting material.
EP00978947A 1999-09-22 2000-09-19 High pressure fuel accumulator Expired - Lifetime EP1131554B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19945316A DE19945316A1 (en) 1999-09-22 1999-09-22 High pressure fuel accumulator
DE19945316 1999-09-22
PCT/DE2000/003244 WO2001021955A1 (en) 1999-09-22 2000-09-19 High pressure fuel accumulator

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EP1131554A1 true EP1131554A1 (en) 2001-09-12
EP1131554B1 EP1131554B1 (en) 2005-07-06

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JP (1) JP2003510491A (en)
DE (2) DE19945316A1 (en)
WO (1) WO2001021955A1 (en)

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Also Published As

Publication number Publication date
EP1131554B1 (en) 2005-07-06
DE19945316A1 (en) 2001-04-05
DE50010665D1 (en) 2005-08-11
WO2001021955A1 (en) 2001-03-29
JP2003510491A (en) 2003-03-18

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