EP0864043B1 - High pressure fuel accumulator - Google Patents

High pressure fuel accumulator Download PDF

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Publication number
EP0864043B1
EP0864043B1 EP97927001A EP97927001A EP0864043B1 EP 0864043 B1 EP0864043 B1 EP 0864043B1 EP 97927001 A EP97927001 A EP 97927001A EP 97927001 A EP97927001 A EP 97927001A EP 0864043 B1 EP0864043 B1 EP 0864043B1
Authority
EP
European Patent Office
Prior art keywords
fuel
tube
pressure store
pressure
fuel high
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.)
Revoked
Application number
EP97927001A
Other languages
German (de)
French (fr)
Other versions
EP0864043A1 (en
Inventor
Steffen Jung
Manfred BACHER-HÖCHST
Heinz Popp
Alois Mair
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7807563&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0864043(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0864043A1 publication Critical patent/EP0864043A1/en
Application granted granted Critical
Publication of EP0864043B1 publication Critical patent/EP0864043B1/en
Anticipated expiration legal-status Critical
Revoked 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
    • 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
    • F02M55/02—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 according to the genus of the claim.
  • Such one High-pressure fuel accumulator known from EP 0 507 191 consists of a prefabricated pipe onto which Connection sleeves are pushed on to connect the Fuel injectors or that of the High pressure fuel pump coming high pressure line.
  • On such high-pressure fuel storage is proportional expensive to manufacture and also required because of to be attached connecting parts a relatively large Installation space. He must also be very thick-walled to the high pressures at the swelling To withstand the loads to which it is exposed.
  • the disadvantage is that thick-walled bodies at high swelling pressure loads tend to tear especially in the area of wall openings and sharp-edged cross-sectional changes.
  • the high-pressure fuel reservoir receives the features of the characterizing part of the claim one a high pressure fuel accumulator that through the eccentric position of the connecting holes the swelling Has grown particularly well. Through this eccentric position overlap the individual loads in the Intersection area with the inner wall of the High pressure storage only vectorially, so that there is a Reduction of the burden of about 30% results. So that gets a significant increase in strength and thus the Lifetime of the high pressure accumulator.
  • An advantageous embodiment according to claim 2 is that the connecting holes tangent to Open inside wall of the tubular body. With that the above-mentioned effect increased again. Particularly advantageous is to avoid abrupt cross-sectional transitions and thus to further reduce the partial Heavy loads on wall cross sections according to the design Claim 4 according to which the tubular body Forging is formed, also by forging molded connection piece. This has the further advantage that a smaller installation space is required because the Connections because of the one-piece with the tubular Bodies can be made much smaller. In addition the high-pressure accumulator takes less weight on.
  • FIG. 1 is a high-pressure fuel accumulator Shown from an elongated, forged there is a tubular body 1, which on its lateral surface 4th to supply 4 fuel injection valves Forging molded connection piece 2 and on the Connection piece 2 diametrically opposite lateral surface integrally formed fasteners 3.
  • the Fasteners have the form of eyelets with through holes 4 to be made by drilling such as that Section II-II in Figure 2 can be seen.
  • On his End faces 5 is the interior of the high-pressure accumulator forming axial passage recess 10 (Figure 2), here as Through hole formed, tightly closed.
  • One of a high-pressure fuel pump, not shown here leading inlet to the interior of the high pressure accumulator is replaced by a between two connections for the Fuel injectors are additional Connection piece 6 formed.
  • the tubular high-pressure accumulator On the side of the Fastening elements 3 can be the tubular high-pressure accumulator have yet another connector 7, in e.g. a pressure sensor or a control valve screwed in can be.
  • the connecting piece 2 are in the usual way provided with a screw thread 8, in the example high-pressure connection lines sealed via a cone seal be used. These lines are through connecting holes 11 with the interior of the tubular High-pressure accumulator 1, the through hole 10, connected.
  • the cross section of this recess is preferably one Circular area, but it can also have another shape, e.g. be an oval.
  • the peculiarity of the invention lies here in that the connecting holes eccentrically with the Eccentricity e to the longitudinal axis of the through hole 10 in flow into this.
  • the junction preferably takes place tangential. This gives the advantage mentioned at the beginning, that the voltage load on the wall of the high pressure accumulator in the area of intersection of the connecting bores with the longitudinal bore can be reduced in that this construction only the single loads vectorial overlay.
  • the connections 2 are used for Connection of the high-pressure fuel accumulator with electrical controlled fuel injection valves.

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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)

Description

Stand der TechnikState of the art

Die Erfindung geht von einem Kraftstoffhochdruckspeicher nach der Gattung des Patentanspruchs aus. Einer solcher durch die EP 0 507 191 bekannter Kraftstoffhochdruckspeicher besteht aus einem vorgefertigten Rohr, auf das Anschlußmuffen aufgeschoben sind zum Anschluß der Kraftstoffeinspritzventile bzw. der von der Kraftstoffhochdruckpumpe kommenden Hochdruckleitung. Ein solcher Kraftstoffhochdruckspeicher ist verhältnismäßig teuer in der Herstellung und benötigt zudem wegen der aufzusetzenden Anschlußteile einen relativ großen Einbauraum. Er muß ferner sehr dickwandig ausgebildet werden, um den hohen Drücken bei den schwellenden Belastungen, denen er ausgesetzt ist, stand zu halten. Ein Nachteil besteht dabei, daß dickwandige Körper bei hohen schwellenden Druckbelastungen dazu neigen, zu reißen, insbesondere im Bereich von Wanddurchbrüchen und scharfkantigen Querschnittsänderungen.The invention relates to a high-pressure fuel accumulator according to the genus of the claim. Such one High-pressure fuel accumulator known from EP 0 507 191 consists of a prefabricated pipe onto which Connection sleeves are pushed on to connect the Fuel injectors or that of the High pressure fuel pump coming high pressure line. On such high-pressure fuel storage is proportional expensive to manufacture and also required because of to be attached connecting parts a relatively large Installation space. He must also be very thick-walled to the high pressures at the swelling To withstand the loads to which it is exposed. On The disadvantage is that thick-walled bodies at high swelling pressure loads tend to tear especially in the area of wall openings and sharp-edged cross-sectional changes.

Vorteile der ErfindungAdvantages of the invention

Durch den erfindungsgemäßen Kraftstoffhochdruckspeicher mit den Merkmalen des Kennzeichens des Patentanspruchs erhält man einen Kraftstoffhochdruckspeicher, der durch die exzentrische Lage der Verbindungbohrungen den schwellenden Belastungen besonders gut gewachsen ist. Durch diese exzentrische Lage überlagern sich die Einzelbelastungen im Verschneidungsbereich mit der Innenwandung des Hochdruckspeichers nur noch vektoriell, so daß sich eine Reduktion der Belastungen von etwa 30% ergibt. Damit erhält man eine wesentliche Steigerung der Festigkeit und damit der Lebensdauer des Hochdruckspeichers.With the high-pressure fuel reservoir according to the invention receives the features of the characterizing part of the claim one a high pressure fuel accumulator that through the eccentric position of the connecting holes the swelling Has grown particularly well. Through this eccentric position overlap the individual loads in the Intersection area with the inner wall of the High pressure storage only vectorially, so that there is a Reduction of the burden of about 30% results. So that gets a significant increase in strength and thus the Lifetime of the high pressure accumulator.

Eine vorteilhafte Ausgestaltung nach Patentanspruch 2 besteht darin, daß die Verbindungsbohrungen tangential zur Innenwand des rohrförmigen Körpers einmünden. Damit wird der obengenannte Effekt nochmals erhöht. Besonders vorteilhaft ist dabei zur Vermeidung von abrupten Querschnittsübergängen und somit zur weiteren Reduktion der partiellen Hochbelastung von Wandquerschnitten die Ausgestaltung nach Patentanspruch 4 wonach der rohrförmige Körper durch Schmieden geformt ist, mit ebenfalls durch Schmieden angeformten Anschlußstutzen. Das hat den weiteren Vorteil, daß ein geringerer Einbauraum benötigt wird, da die Anschlüsse wegen der Einstückigkeit mit dem rohrartigen Körper wesentlich kleiner ausgeführt werden können. Zudem nimmt der Hochdruckspeicher damit ein geringeres Gewicht ein.An advantageous embodiment according to claim 2 is that the connecting holes tangent to Open inside wall of the tubular body. With that the the above-mentioned effect increased again. Particularly advantageous is to avoid abrupt cross-sectional transitions and thus to further reduce the partial Heavy loads on wall cross sections according to the design Claim 4 according to which the tubular body Forging is formed, also by forging molded connection piece. This has the further advantage that a smaller installation space is required because the Connections because of the one-piece with the tubular Bodies can be made much smaller. In addition the high-pressure accumulator takes less weight on.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In der Zeichnung Figur 1 ist ein Kraftstoffhochdruckspeicher dargestellt, der aus einem langgestreckten, geschmiedeten rohrförmigen Körper 1 besteht, der auf seiner Mantelfläche 4 zur Versorgung von 4 Kraftstoffeinspritzventilen durch Schmieden angeformte Anschlußstutzen 2 und auf der den Anschlußstutzen 2 diametral gegenüberliegenden Mantelfläche angeformte Befestigungselemente 3 aufweist. Die Befestigungselemente haben Form von Befestigungsösen mit durch Bohren herzustellenden Durchgangslöchern 4, wie dem Schnitt II-II in Figur 2 zu entnehmen ist. Auf seinen Stirnseiten 5 ist eine den Innenraum des Hochdruckspeichers bildende axiale Durchgangsausnehmung 10 (Figur 2), hier als Durchgangsbohrung ausgebildet, fest verschlossen. Ein von einer hier nicht gezeigten Kraftstoffhochdruckpumpe herführender Zulauf zum Innenraum des Hochdruckspeichers wird durch eine zwischen zwei Anschlüssen für die Kraftstoffeinspritzventile liegenden zusätzlichen Anschlußstutzen 6 gebildet. Auf der Seite der Befestigungselemente 3 kann der rohrförmige Hochdruckspeicher noch einen weiteren Anschlußstutzen 7 aufweisen, in den z.B. ein Drucksensor oder ein Steuerventil eingeschraubt werden kann. Die Anschlußstutzen 2 werden in üblicher Weise mit einem Schraubgewinde 8 versehen, in die beispielsweise über eine Kegeldichtung Hochdruckverbindungsleitungen dicht eingesetzt werden. Diese Leitungen sind über Verbindungsbohrungen 11 mit dem Innenraum des rohrförmigen Hochdruckspeichers 1, der Durchgangsbohrung 10, verbunden. Der Querschnitt dieser Ausnehmung ist vorzugsweise eine Kreisfläche, sie kann aber auch eine andere Form haben, z.B. ein Oval sein. Die erfindungsgemäße Besonderheit liegt dabei darin, daß die Verbindungsbohrungen exzentrisch mit der Exzentrizität e zur Längsachse der Durchgangsbohrung 10 in diese einmünden. Vorzugsweise erfolgt die Einmündung tangential. Damit ergibt sich der eingangs genannte Vorteil, daß die Spannnungsbelastung der Wand des Hochdruckspeichers im Bereich der Verschneidung der Verbindungsbohrungen mit der Längsbohrung dadurch reduziert werden, daß sich bei dieser Konstruktion die Einzelbelastungen nur noch vektoriell überlagern. Die Anschlüsse 2 dienen zur Verbindung des Kraftstoffhochdruckspeichers mit elektrisch gesteuerten Kraftstoffeinspritzventilen.In the drawing Figure 1 is a high-pressure fuel accumulator Shown from an elongated, forged there is a tubular body 1, which on its lateral surface 4th to supply 4 fuel injection valves Forging molded connection piece 2 and on the Connection piece 2 diametrically opposite lateral surface integrally formed fasteners 3. The Fasteners have the form of eyelets with through holes 4 to be made by drilling such as that Section II-II in Figure 2 can be seen. On his End faces 5 is the interior of the high-pressure accumulator forming axial passage recess 10 (Figure 2), here as Through hole formed, tightly closed. One of a high-pressure fuel pump, not shown here leading inlet to the interior of the high pressure accumulator is replaced by a between two connections for the Fuel injectors are additional Connection piece 6 formed. On the side of the Fastening elements 3 can be the tubular high-pressure accumulator have yet another connector 7, in e.g. a pressure sensor or a control valve screwed in can be. The connecting piece 2 are in the usual way provided with a screw thread 8, in the example high-pressure connection lines sealed via a cone seal be used. These lines are through connecting holes 11 with the interior of the tubular High-pressure accumulator 1, the through hole 10, connected. The cross section of this recess is preferably one Circular area, but it can also have another shape, e.g. be an oval. The peculiarity of the invention lies here in that the connecting holes eccentrically with the Eccentricity e to the longitudinal axis of the through hole 10 in flow into this. The junction preferably takes place tangential. This gives the advantage mentioned at the beginning, that the voltage load on the wall of the high pressure accumulator in the area of intersection of the connecting bores with the longitudinal bore can be reduced in that this construction only the single loads vectorial overlay. The connections 2 are used for Connection of the high-pressure fuel accumulator with electrical controlled fuel injection valves.

Claims (5)

  1. Fuel high-pressure store for a fuel injection system for internal combustion engines, with a fuel high-pressure pump which supplies fuel to the high-pressure store, out of which the fuel is fed to electrically controlled injection valves for injection into the combustion spaces of an auto-ignition internal combustion engine, the fuel high-pressure store consisting of an elongate tube-like body made of steel, provided with connections (2, 6, 7) for the feed of fuel and the discharge of fuel, characterized in that the connections are designed as connection nipples, out of each of which a connecting bore opens into the tube-like body eccentrically to the axis of the latter.
  2. Fuel high-pressure store according to Claim 1, characterized in that the connecting bores open in tangentially to the inner wall of the tube-like body.
  3. Fuel high-pressure store according to Claim 2, characterized in that the inner cross section of the tube-like body is a circular surface.
  4. Fuel high-pressure store according to one of the preceding Claims 1 to 3, characterized in that the tube-like body is formed by forging, with connection nipples (2, 6, 7) likewise integrally formed by forging.
  5. Fuel high-pressure store according to one of the preceding Claims 1 to 4, characterized in that fastening brackets are integrally formed on the tube-like body.
EP97927001A 1996-09-30 1997-06-12 High pressure fuel accumulator Revoked EP0864043B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19640480A DE19640480B4 (en) 1996-09-30 1996-09-30 High-pressure fuel storage
DE19640480 1996-09-30
PCT/DE1997/001188 WO1998014700A1 (en) 1996-09-30 1997-06-12 High pressure fuel accumulator

Publications (2)

Publication Number Publication Date
EP0864043A1 EP0864043A1 (en) 1998-09-16
EP0864043B1 true EP0864043B1 (en) 2001-11-28

Family

ID=7807563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97927001A Revoked EP0864043B1 (en) 1996-09-30 1997-06-12 High pressure fuel accumulator

Country Status (7)

Country Link
US (1) US6223726B1 (en)
EP (1) EP0864043B1 (en)
JP (1) JP2000501477A (en)
KR (1) KR19990071673A (en)
CN (1) CN1077221C (en)
DE (2) DE19640480B4 (en)
WO (1) WO1998014700A1 (en)

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Also Published As

Publication number Publication date
US6223726B1 (en) 2001-05-01
EP0864043A1 (en) 1998-09-16
DE59705542D1 (en) 2002-01-10
WO1998014700A1 (en) 1998-04-09
CN1077221C (en) 2002-01-02
DE19640480A1 (en) 1998-04-02
DE19640480B4 (en) 2004-04-22
KR19990071673A (en) 1999-09-27
JP2000501477A (en) 2000-02-08
CN1205049A (en) 1999-01-13

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