EP1144852A1 - Procede de realisation d'un accumulateur de carburant haute pression - Google Patents

Procede de realisation d'un accumulateur de carburant haute pression

Info

Publication number
EP1144852A1
EP1144852A1 EP00978953A EP00978953A EP1144852A1 EP 1144852 A1 EP1144852 A1 EP 1144852A1 EP 00978953 A EP00978953 A EP 00978953A EP 00978953 A EP00978953 A EP 00978953A EP 1144852 A1 EP1144852 A1 EP 1144852A1
Authority
EP
European Patent Office
Prior art keywords
connection
base body
pressure fuel
bore
interior
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00978953A
Other languages
German (de)
English (en)
Inventor
Kurt Frank
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 EP1144852A1 publication Critical patent/EP1144852A1/fr
Withdrawn legal-status Critical Current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 method for producing a high-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine, with a hollow base body which is equipped with a plurality of connection openings.
  • a high-pressure pump conveys the fuel to be injected from a tank into the central high-pressure fuel reservoir, which is referred to as the common rail.
  • Fuel lines lead from the rail to the individual injectors, which are assigned to the cylinders of the internal combustion engine. The injectors are used individually depending on the operating parameters of the internal combustion engine
  • Engine electronics controlled to inject fuel into the combustion chamber of the internal combustion engine.
  • a conventional high-pressure fuel accumulator is e.g. described in DE 195 48 611. conventional
  • High-pressure fuel accumulators are manufactured, for example, from a forged blank. Serves as fuel storage a longitudinal hole in the mostly elongated body.
  • the connection openings are usually created by drilling.
  • the area of intersection between the longitudinal bore and the connection bores is sharp-edged and burred due to the manufacturing process. Deburring and then cleaning the intersection area is complex and expensive.
  • the object of the invention is to provide a method for producing a high-pressure fuel accumulator that is simple and inexpensive.
  • the high-pressure strength of the high-pressure fuel accumulators produced is to be improved.
  • the object is achieved in a method for producing a high-pressure fuel accumulator for a common rail fuel injection system of an internal combustion engine, with a hollow base body which is equipped with a plurality of connection openings, in that a connection bore is predrilled and that
  • connection between the connection hole and the interior of the base body is created with the help of another machining process.
  • the high-pressure strength of the high-pressure fuel reservoir is primarily limited by the intersections between the connection openings and the base body.
  • High-pressure fuel storage can be increased.
  • drilling is reduced to pre-drilling. This significantly reduces drill wear.
  • a special embodiment of the invention is characterized in that the further method is an electrochemical removal method (ECM, electro-
  • the electrochemical removal process creates the connection between the predrilled connection hole and the interior of the base body.
  • the electrochemical removal process simultaneously creates a rounded transition between the predrilled connection bore and the interior of the base body.
  • connection bores are made tangential to the interior of the base body.
  • this arrangement of the connection bores has proven to be particularly advantageous in practice. When the connection holes are drilled through, drill breaks often occur in this arrangement. This undesirable tool wear is avoided by the inventive two-stage production of the connection bores.
  • Another special embodiment of the invention is characterized in that a plurality of connection bores are machined simultaneously using a multiple electrode. This reduces the processing time, which has a positive effect on the manufacturing costs.
  • intersection area is machined, in particular rounded, between the connection bores and the basic body interior using the electrochemical removal process.
  • the intersection area can be specifically optimized in order to further improve the high-pressure strength of the high-pressure fuel reservoir according to the invention.
  • FIG. 2 the high-pressure fuel accumulator from FIG. 1 after further processing
  • Fig. 4 a similar section as in Fig. 3 with a special inner geometry.
  • the high-pressure fuel reservoir shown in cross section in FIG. 1 comprises a tubular one
  • a longitudinal bore 2 extends in the axial direction in the tubular basic body 1.
  • the longitudinal bore 2 forms the storage volume of the high-pressure fuel reservoir according to the invention.
  • Connection piece 3 formed, of which only one can be seen in the cross section shown.
  • An external thread 5 is formed on the outer lateral surface of the connecting piece 3. The external thread 5 is used to attach a (not shown) high-pressure fuel line, the
  • High-pressure fuel accumulator connects to one of the injectors of the internal combustion engine.
  • connection bore 4 is pre-drilled in the connection piece 3.
  • the connection bore 4 extends tangentially transverse to the longitudinal bore 2.
  • the tip of the connection bore 4 is separated from the longitudinal bore 2 by a remaining wall thickness S.
  • the material remaining after predrilling is removed by electrochemical removal.
  • electrochemical removal the metallic material of the base body 1 is anodically dissolved in the region 6 under the action of an electrical current and an electrolyte solution.
  • the current flow can be brought about by an external current source, but also by local element formation on the workpiece (internal voltage source).
  • the high-pressure fuel accumulator is indicated by the arrows at 7 that the edges in the region of the mouth of the connection bore 4 are rounded into the longitudinal bore 2. Rounding can take place, for example, by electrochemical removal. In the further embodiment of the invention shown in detail in FIG. 4, even more material was removed in the transition region 8 between the connection bore 4 and the longitudinal bore 2 in order to make the transition even softer. The material is preferably removed by electrochemical removal.
  • connection bore 2 Longitudinal bore 2 drilled and the connection bore 4 pre-drilled so far that the remaining wall thickness S is minimal.
  • connection between the longitudinal bore 2 and the connection bore 4 is established by means of ECM processing.
  • a multiple electrode can be used to shorten the machining time.
  • intersection geometry can be specifically optimized with the ECM processing in order to achieve optimum high-pressure strength of the high-pressure fuel accumulator according to the invention.

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

La présente invention concerne un procédé de réalisation d'un accumulateur de carburant haute pression destiné à un système d'injection de carburant à rampe commune d'un moteur thermique, comprenant un corps creux principal (1) doté de plusieurs ouvertures de raccordement (3). Le procédé peut être mis en oeuvre de manière simple et économique par percement d'un avant-trou de raccordement (4). La liaison entre l'avant-trou de raccordement (4) et l'intérieur (2) du corps principal (1) est réalisée au moyen d'un autre procédé d'usinage.
EP00978953A 1999-10-16 2000-09-28 Procede de realisation d'un accumulateur de carburant haute pression Withdrawn EP1144852A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19949963 1999-10-16
DE19949963A DE19949963A1 (de) 1999-10-16 1999-10-16 Verfahren zum Herstellen eines Kraftstoffhochdruckspeichers
PCT/DE2000/003387 WO2001029404A1 (fr) 1999-10-16 2000-09-28 Procede de realisation d'un accumulateur de carburant haute pression

Publications (1)

Publication Number Publication Date
EP1144852A1 true EP1144852A1 (fr) 2001-10-17

Family

ID=7925912

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00978953A Withdrawn EP1144852A1 (fr) 1999-10-16 2000-09-28 Procede de realisation d'un accumulateur de carburant haute pression

Country Status (6)

Country Link
US (1) US6557786B1 (fr)
EP (1) EP1144852A1 (fr)
JP (1) JP2003512559A (fr)
CZ (1) CZ20012119A3 (fr)
DE (1) DE19949963A1 (fr)
WO (1) WO2001029404A1 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10123234A1 (de) * 2001-05-12 2002-11-28 Bosch Gmbh Robert Kraftstoffhochdruckspeicher mit optmierter Geometrie
DE10126617B4 (de) * 2001-05-31 2005-05-25 Siemens Ag Kraftstoffzuführvorrichtung
DE10143947A1 (de) * 2001-09-07 2003-04-03 Bosch Gmbh Robert Injektorkörper mit tangentialem Druckanschluss
DE10152261A1 (de) * 2001-10-20 2003-04-30 Bosch Gmbh Robert Hochdruckspeicher wie Kraftstoffhochdruckspeicher
DE10214404A1 (de) * 2002-03-30 2003-10-09 Bosch Gmbh Robert Bauelement, insbesondere Gehäuse einer Hochdruck-Kraftstoffpumpe, sowie Verfahren zu seiner Herstellung
JP2004092551A (ja) * 2002-09-02 2004-03-25 Usui Kokusai Sangyo Kaisha Ltd ディーゼルエンジン用コモンレール
AU2002368377A1 (en) * 2002-11-19 2004-06-15 Robert Bosch Gmbh Conduit intersection for high pressure fluid flow
DE10305078A1 (de) * 2003-02-07 2004-04-22 Robert Bosch Gmbh Kraftstoffhochdruckspeicher
US20080062407A1 (en) * 2006-08-31 2008-03-13 Mikhail Boroditsky Method and apparatus for increasing the security of the physical fiber plant by polarization monitoring
DE102007018471A1 (de) * 2007-04-19 2008-10-23 Robert Bosch Gmbh Verschneidungsbereich zwischen einer Hochdruckkammer und einem Hochdruckkanal
FI120844B (fi) * 2007-05-31 2010-03-31 Waertsilae Finland Oy Polttoaineen syöttöjärjestelmän polttoainevarasto
DE102010022909A1 (de) * 2010-06-07 2011-12-08 Continental Automotive Gmbh Kraftstoffinjektor mit Kanalanordnung
EP2511517B1 (fr) * 2011-04-15 2015-04-01 Wärtsilä Schweiz AG Rail fluide haute pression
DE102016122785B4 (de) * 2016-11-25 2022-11-03 Stoba Sondermaschinen Gmbh Verfahren zum Herstellen einer Brennstoff- oder Hydraulikmittelleiteinheit mittels kombinatorischem ECM-Bearbeitens und Laserbohrens
DE102017205691A1 (de) 2017-04-04 2018-10-04 Robert Bosch Gmbh Kraftstoff-Hochdruckspeicher
GB2598318A (en) * 2020-08-25 2022-03-02 Delphi Tech Ip Ltd Common rail housing and a method of forming a drilling in a common rail housing
DE102021210205A1 (de) * 2021-09-15 2023-03-16 Robert Bosch Gesellschaft mit beschränkter Haftung Bewerten von Verrundungen von Innenbohrungskanten mittels maschinellem Lernen unter Nutzung von Vibrationsdaten oder dergleichen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0425236A1 (fr) * 1989-10-26 1991-05-02 Lucas Industries Public Limited Company Buse d'injection de combustible pour moteurs à combustion interne

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
US3655530A (en) * 1970-06-15 1972-04-11 Mead Corp Fabrication of orifices
US3767555A (en) * 1971-10-18 1973-10-23 United Aircraft Corp Replaceable tool for electrochemical drilling
US4483907A (en) * 1978-02-23 1984-11-20 The Broken Hill Proprietary Company Limited Manufacture of tinplate and tinplate containers
US4364161A (en) * 1980-12-29 1982-12-21 The Marison Company Method of fabricating a high pressure tank
US5026462A (en) * 1990-03-06 1991-06-25 Ail Corporation Method and apparatus for electrochemical machining of spray holes in fuel injection nozzles
US5192026A (en) * 1990-03-29 1993-03-09 Cummins Engine Company, Inc. Fuel injectors and methods for making fuel injectors
GB9417168D0 (en) * 1994-08-25 1994-10-12 Delta Fluid Products Ltd Flow control valve assembly
DE29521402U1 (de) * 1995-12-23 1997-04-24 Robert Bosch Gmbh, 70469 Stuttgart Kraftstoffeinspritzsystem
GB2322819B (en) * 1997-03-03 2000-12-13 Usui Kokusi Sangyo Kaisha Ltd Method for improving fatique strength due to repeated pressure at branch hole part in member for high pressure fluid.
GB2322921B (en) * 1997-03-03 2001-09-12 Usui Kokusai Sangyo Kk Common rail and method of manufacturing the same
DE19736191A1 (de) * 1997-08-20 1999-02-25 Siemens Ag Druckbehälter mit Anschlußbohrung
DE19843953A1 (de) * 1998-09-24 2000-03-30 Siemens Ag Kraftstoffeinspritzventil für eine Brennkraftmaschine
US6267868B1 (en) * 1999-08-16 2001-07-31 General Electric Company Method and tool for electrochemical machining

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0425236A1 (fr) * 1989-10-26 1991-05-02 Lucas Industries Public Limited Company Buse d'injection de combustible pour moteurs à combustion interne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO0129404A1 *

Also Published As

Publication number Publication date
US6557786B1 (en) 2003-05-06
DE19949963A1 (de) 2001-04-26
JP2003512559A (ja) 2003-04-02
WO2001029404A1 (fr) 2001-04-26
CZ20012119A3 (cs) 2002-06-12

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