WO2004070193A1 - Accumulateur de carburant haute pression - Google Patents

Accumulateur de carburant haute pression Download PDF

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Publication number
WO2004070193A1
WO2004070193A1 PCT/DE2003/003099 DE0303099W WO2004070193A1 WO 2004070193 A1 WO2004070193 A1 WO 2004070193A1 DE 0303099 W DE0303099 W DE 0303099W WO 2004070193 A1 WO2004070193 A1 WO 2004070193A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure fuel
interior
chamfer
fuel accumulator
base body
Prior art date
Application number
PCT/DE2003/003099
Other languages
German (de)
English (en)
Inventor
Markus Degn
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 WO2004070193A1 publication Critical patent/WO2004070193A1/fr

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

  • An injection system is used to supply an internal combustion engine with fuel.
  • the accumulator injection system called common rail system, pressure generation and injection are decoupled from one another in time and place.
  • a separate high-pressure pump generates the injection pressure in a central high-pressure fuel reservoir.
  • the start of injection and the injection quantity are determined by the activation time and duration of electrically actuated injectors which are connected to the high-pressure fuel reservoir via fuel lines.
  • electrically actuated injectors which are connected to the high-pressure fuel reservoir via fuel lines.
  • DE-A 199 36 533 relates to a high-pressure fuel accumulator for a Comrnon-Rail fuel injection system of an internal combustion engine with a tubular base body which has a blind hole running in the longitudinal direction and a plurality of connections.
  • the high-pressure fuel accumulator has a hollow base body that is equipped with several connection openings.
  • the interior of the base body is flat in the area of the connection openings.
  • DE-A 199 45 316 also relates to 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 order to increase the high-pressure strength, the interior is arranged eccentrically with respect to the longitudinal axis of the base body.
  • the high-pressure strength of the high-pressure fuel accumulator is mainly limited by the intersections between the connection openings and the interior of the base body. These drilling intersections are heavily stressed by the internal pressure and represent possible points of failure of the high-pressure fuel accumulator. During operation, stress peaks occur there, through which cracks can form in the base body.
  • a further part of the present invention is that the compressive strength of a high-pressure fuel accumulator is increased.
  • the increased compressive strength results from the greater resilience of the intersections of bores between the interior in the base body of the high-pressure fuel accumulator and the connection bores in its connecting piece.
  • a high-pressure fuel accumulator for a common rail fuel injection system for internal combustion engines which comprises a base body with an interior and at least one connection piece, the at least one connection piece containing at least one connection hole opening into the interior and forming an intersection, and the Connection bore in the area of the intersection has a chamfer-shaped widening towards the interior.
  • the base body and the interior of the high-pressure fuel accumulator are preferably both spherical or cylindrical.
  • the interior can also be along its longitudinal have any cross-sections that are optimally designed for the operating conditions of the high-pressure fuel accumulator.
  • the present invention furthermore relates to a ner driving for producing a high-pressure fuel accumulator according to the invention, the chamfer-shaped widening being applied by cutting ner driving.
  • the attachment of this chamfer is also used as a deburring process for the cutting.
  • the chamfer can be produced inexpensively by machining ner driving. Furthermore, burrs are largely avoided in a machining ner travel, so that further effort for deburring is superfluous.
  • Another advantage is that during the manufacturing process sequence surface coating and subsequent machining of the chamfer, possible material defects are removed by acid attack during electrolytic coating in the intersection area by the chamfer cutting.
  • the present invention furthermore relates to a method for producing a high-pressure fuel accumulator according to the invention, in which the base body containing the interior and the connecting pieces containing a cavity are cast in one piece from a high-strength cast material, so that the cavity has the bevel-shaped widening toward the interior.
  • the cavity replaces the A- ⁇ sc white hole, which is produced using a cutting process.
  • Casting the high-pressure fuel accumulator from a high-strength cast material enables the design of the high-pressure fuel accumulator to be adapted to an optimum in terms of its pressure resistance.
  • inner shapes can be produced, but also outer shapes that are ideally adapted to the stresses that occur during operation.
  • the shape of the high-pressure fuel accumulator by casting offers the possibility of realizing construction ideas to a particularly high degree due to the extensive design freedom of this process.
  • the stresses occurring during operation can be used as a basis.
  • the chamfer-like expansion contained in the high-pressure fuel reservoir according to the invention can be integrated into the high-pressure fuel reservoir during manufacture.
  • a preferred cast material from which the high-pressure fuel reservoir is cast is cast steel. Cast steel has a wide range of applications for highly stressed components and is therefore also outstandingly suitable for the method according to the invention or the high-pressure fuel accumulator according to the invention.
  • the cast material is a cast iron. This is a very inexpensive construction material.
  • a cast iron is used for the production of high-pressure fuel accumulators that has sufficient strength, preferably spheroidal graphite cast iron (GGG), particularly preferably GGG 80.
  • the numerical value 80 relates to the tensile strength of the cast iron.
  • FIG. 1 shows a cross section through a fuel high pressure accumulator according to the invention
  • FIG. 2 shows an enlarged detail from FIG. 1, which comprises the chamfer-shaped widening.
  • FIG. 1 shows a cross section through a high-pressure fuel accumulator according to the invention with a chamfer-shaped widening of the connection bore.
  • the high-pressure fuel reservoir shown in cross section comprises a base body 1, in which the longitudinal bore 2 forms an interior 5.
  • a connection piece 3 is formed on the base body 1, in which a connection bore 4 (or a cavity 4) extends perpendicular to the longitudinal bore 2.
  • the connection bore 4 opens into the longitudinal bore 2.
  • the connection piece 3 can be forged or welded to the base body 1 or the entire high-pressure fuel accumulator (including the connection piece 3 and grand body 1) can be a one-piece cast part.
  • fuel lines (not shown) lead to the individual injectors via the connection stub 3 and inject the fuel into the combustion chamber of the internal combustion engine.
  • connection bore 4 has a chamfer-shaped widening 6 towards the interior 5 in the area of the intersection of the interior 5 and the connection bore 4.
  • This configuration of the intersection with the chamfer-shaped widening 6 has the advantage that the load tensions at the most highly stressed point are reduced and consequently the strength values of the high-pressure fuel accumulator are improved.
  • FIG. 2 shows an enlarged detail Y from FIG. 1, which comprises the chamfer-shaped widening.
  • connection bore 4 is oriented perpendicular to the " longitudinal axis of the interior 5. In an embodiment (not shown) of the present invention, however, the connection bore 4 can also intersect with the longitudinal bore 2 at a different angle.
  • the chamfer-shaped expansion 6 is limited to the intersection area
  • the chamfered widening 6 has a straight course
  • the chamfered widening 6 is arcuate, which offers the possibility of the location of the maximum load with a suitable design, the contour of the chamfer is preferably straight or arched, but can also take any other course.
  • the bevel-shaped widening 6 has a sharp-edged transition 7, 8 to the connection bore 4 and / or to the interior 5. It is advantageous here that no further deburring or rounding is required at the transition from the chamfer-shaped widening 6 to the connection bore 4 and / or to the interior 5.
  • the chamfer-shaped widening 6 has a rounded transition 7, 8 to the connection bore 4 and / or to the interior 5.
  • the angle ⁇ of the chamfered widening 6 and the height h are designed in a suitable form.
  • the suitable shape depends on the dimensions of the connection bore and the longitudinal bore creating the interior (respective diameter) as well as their position relative to each other (centric or eccentric) and the associated tolerances. For example, with a diameter of the longitudinal bore of 10 mm, a diameter of the connecting bore of 3 mm and a central position, a height h of approximately 1 mm and an angle ⁇ of approximately 20 ° are advantageous.

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

L'invention concerne un accumulateur de carburant haute pression conçu pour un système d'injection de carburant à rampe commune (common rail) de moteurs à combustion interne. Cet accumulateur de carburant haute pression comprend un corps de base (1) présentant un espace intérieur (5) et au moins un raccord (3), lequel raccord (3) comporte au moins un alésage de raccordement (4) débouchant dans l'espace intérieur (5) et formant une intersection, lequel alésage de raccordement (4) présente, au niveau de cette intersection, un élargissement biseauté (6) en direction de l'espace intérieur (5).
PCT/DE2003/003099 2003-02-07 2003-09-18 Accumulateur de carburant haute pression WO2004070193A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003105078 DE10305078A1 (de) 2003-02-07 2003-02-07 Kraftstoffhochdruckspeicher
DE10305078.7 2003-02-07

Publications (1)

Publication Number Publication Date
WO2004070193A1 true WO2004070193A1 (fr) 2004-08-19

Family

ID=32038810

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/003099 WO2004070193A1 (fr) 2003-02-07 2003-09-18 Accumulateur de carburant haute pression

Country Status (2)

Country Link
DE (1) DE10305078A1 (fr)
WO (1) WO2004070193A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230099915A1 (en) * 2020-03-12 2023-03-30 Robert Bosch Gmbh Component for an injection system and injection system for mixture-compressing, spark-ignition internal combustion engines and method for producing such a component

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004037787B4 (de) * 2004-08-03 2006-05-18 Benteler Automobiltechnik Gmbh Kraftstoffzuführung für eine Verbrennungsmaschine mit Direkteinspritzung
DE102005012941A1 (de) * 2005-03-21 2006-09-28 Robert Bosch Gmbh Kraftstoffhochdruckspeicher sowie Verfahren zu dessen Herstellung
DE102010029052A1 (de) * 2010-05-18 2011-11-24 Robert Bosch Gmbh Kraftstoffverteiler und dessen Verwendung
EP2511517B1 (fr) * 2011-04-15 2015-04-01 Wärtsilä Schweiz AG Rail fluide haute pression

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19948339C1 (de) * 1999-10-07 2000-12-14 Bosch Gmbh Robert Kraftstoffhochdruckspeicher
DE19948341A1 (de) * 1999-10-07 2001-04-19 Bosch Gmbh Robert Kraftstoffhochdruckspeicher
DE19949963A1 (de) * 1999-10-16 2001-04-26 Bosch Gmbh Robert Verfahren zum Herstellen eines Kraftstoffhochdruckspeichers
DE10001507A1 (de) * 2000-01-15 2001-07-19 Bosch Gmbh Robert Verfahren zur Einbringung einer Durchgangsöffnung in einen Kraftstoffhochdruckspeicher und Vorrichtung zur Durchführung des Verfahrens
JP2002089404A (ja) * 2000-09-18 2002-03-27 Otics Corp コモンレール

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19647049A1 (de) * 1996-11-14 1998-05-20 Bosch Gmbh Robert Kraftstoffeinspritzsystem
DE19936685A1 (de) * 1999-08-04 2001-02-22 Bosch Gmbh Robert Kraftstoffhochdruckspeicher

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19948339C1 (de) * 1999-10-07 2000-12-14 Bosch Gmbh Robert Kraftstoffhochdruckspeicher
DE19948341A1 (de) * 1999-10-07 2001-04-19 Bosch Gmbh Robert Kraftstoffhochdruckspeicher
DE19949963A1 (de) * 1999-10-16 2001-04-26 Bosch Gmbh Robert Verfahren zum Herstellen eines Kraftstoffhochdruckspeichers
DE10001507A1 (de) * 2000-01-15 2001-07-19 Bosch Gmbh Robert Verfahren zur Einbringung einer Durchgangsöffnung in einen Kraftstoffhochdruckspeicher und Vorrichtung zur Durchführung des Verfahrens
JP2002089404A (ja) * 2000-09-18 2002-03-27 Otics Corp コモンレール

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 07 3 July 2002 (2002-07-03) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230099915A1 (en) * 2020-03-12 2023-03-30 Robert Bosch Gmbh Component for an injection system and injection system for mixture-compressing, spark-ignition internal combustion engines and method for producing such a component
US11828255B2 (en) * 2020-03-12 2023-11-28 Robert Bosch Gmbh Component for an injection system and injection system for mixture-compressing, spark-ignition internal combustion engines and method for producing such a component

Also Published As

Publication number Publication date
DE10305078A1 (de) 2004-04-22

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