EP2299102A1 - Hochdruck-Kraftstoffspeicher für Common-Rail Kraftstoffeinspritzsystemen - Google Patents

Hochdruck-Kraftstoffspeicher für Common-Rail Kraftstoffeinspritzsystemen Download PDF

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Publication number
EP2299102A1
EP2299102A1 EP09425341A EP09425341A EP2299102A1 EP 2299102 A1 EP2299102 A1 EP 2299102A1 EP 09425341 A EP09425341 A EP 09425341A EP 09425341 A EP09425341 A EP 09425341A EP 2299102 A1 EP2299102 A1 EP 2299102A1
Authority
EP
European Patent Office
Prior art keywords
fuel accumulator
pressure fuel
longitudinal
reduction
groove
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Withdrawn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
EP09425341A
Other languages
English (en)
French (fr)
Inventor
Marco Coppo
Pierpaolo Miotti
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.)
OMT Officine Meccaniche Torino SpA
Original Assignee
OMT Officine Meccaniche Torino SpA
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 OMT Officine Meccaniche Torino SpA filed Critical OMT Officine Meccaniche Torino SpA
Priority to EP09425341A priority Critical patent/EP2299102A1/de
Publication of EP2299102A1 publication Critical patent/EP2299102A1/de
Withdrawn legal-status Critical Current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
    • F02M55/025—Common rails
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations

Definitions

  • the present invention relates to a high-pressure fuel accumulator for common-rail injection systems.
  • a high-pressure fuel accumulator comprises a tubular body elongated in a longitudinal direction, having a longitudinal cylindrical hole and a plurality of connection holes perpendicular to the axis of the longitudinal cylindrical hole.
  • Each connection hole has an internal end open in the longitudinal cylindrical hole and an external end open onto an outer surface of the tubular body.
  • EP-B1-1413744 describes a high-pressure accumulator for a common-rail injection system having a longitudinal cylindrical hole for accumulation of fuel and at least one radial hole for discharge of the fuel.
  • a longitudinal cylindrical hole for accumulation of fuel
  • at least one radial hole for discharge of the fuel.
  • an arched wall with a curvature that is opposite to that of the wall of the longitudinal hole and extends throughout the length of the tubular body.
  • the radial connection holes have the internal end open onto said arched wall.
  • the object of the present invention is to provide a high-pressure fuel accumulator that does not involve costly manufacturing processes for obtaining the profile for reduction of stress in the area of intersection between the radial connection holes and the longitudinal hole.
  • said object is achieved by a high-pressure accumulator having the characteristics forming the subject of Claim 1.
  • the injection system 10 comprises a fuel accumulator 12 that is supplied with fuel at high pressure by a pump 14 equipped with a valve for regulating the flow rate 16.
  • the fuel accumulator 12 supplies a plurality of injectors 18.
  • An electronic control unit 20 governs opening of the injectors 18 and the valve for regulating the flow rate 16 in order to keep the pressure in the accumulator 12 at the desired level.
  • the electronic control unit 20 detects the pressure within the fuel accumulator 12 by means of a sensor 22.
  • the fuel accumulator 12 comprises a tubular body 24 elongated in a longitudinal direction A.
  • a longitudinal cylindrical hole 26 with circular cross section is formed in the tubular body.
  • the tubular body 24 has a plurality of connection holes 28 that extend in a radial direction with respect to the longitudinal axis A.
  • Each connection hole 28 has an internal end 30 open in the cylindrical hole 26 and an external end 32 open onto an outer surface 34 of the tubular body 24.
  • Each connection hole 28 has a central stretch with cylindrical section, preferably with circular cross section, with a radial axis B orthogonal to the longitudinal axis A.
  • the external end 32 of each connection hole 28 can have the shape of a truncated cone with major diameter open towards the outside, which forms a sealing seat for the end of a connection tube.
  • each connection hole 28 At the internal end of each connection hole 28 a recess is formed for reduction of the stresses 36, which has a limited extension in a longitudinal direction A.
  • the recess for reduction of the stresses 36 has the form of a groove centred with respect to the longitudinal axis A, preferably of an annular shape.
  • the groove 36 has a length L in the direction of the longitudinal axis A.
  • the length L is preferably not greater than three times the diameter d of the connection hole 28.
  • Designated by P in Figures 5 and 6 is the depth in a radial direction of the recess for reduction of the stresses 36.
  • the recess for reduction of the stresses 36 has the form of a groove, preferably of annular shape, with longitudinal axis parallel and eccentric with respect to the longitudinal axis A, the axis of the groove being displaced with respect to the longitudinal axis A towards the connection hole 28.
  • the groove 36 in a section lying in a plane passing through the longitudinal axis A, the groove 36 has a central cylindrical portion 36a and two small radiusing end portions 36b of radius R1.
  • the groove 36 has a wall 36c having a continuous circular shape with a radius R2 that radiuses to one another the areas of intersection between the groove 36 and the cylindrical hole 26.
  • the diagram of Figure 7 illustrates the percentage of reduction of the maximum stress as a function of the ratio L/d, where L is the extension of the recess for reduction of the stresses 36 in a longitudinal direction and d is the diameter of the connection hole 28.
  • the percentage of reduction of the maximum stress is calculated on the geometry illustrated in Figure 3 with reference to a reference configuration in which only a radius of radiusing between the internal end of the connection hole 28 and the longitudinal cylindrical hole 26 is present.
  • the benefits as regards the reduction of the maximum stress are limited with ratios L/d higher than three. The benefits increase considerably as the axial extension L of the recess for reduction of the stresses 36 decreases.
  • FIG. 8 illustrates the percentage of reduction of the maximum stress for the geometry illustrated in Figure 3 as a function of the ratio P/d, where P indicates the radial depth of the groove 36 and d the diameter of the connection hole 28.
  • each recess for reduction of the stresses 36 has the form of an annular groove centred with respect to the axis B of the respective connection hole 28. Also in this case the dimension in a longitudinal direction L ( Figure 11 ) of the recess for reduction of the stresses 36 has a limited extension, preferably not greater than three times the diameter d of the connection hole 28.
  • FIG. 13 to 15 Illustrated in Figures 13 to 15 is a third embodiment of the present invention.
  • two recesses for reduction of the stresses 36 are provided arranged symmetrically with respect to a plane passing through the longitudinal axis A and through the axis B of the connection hole 28.
  • the recesses 36 have a limited extension in a longitudinal direction, preferably not greater than three times the diameter of the connection hole 28.
  • the recesses for reduction of the stresses 36 are preferably formed by means of electrochemical machining (ECM) or electrical-discharge machining (EDM).
  • ECM electrochemical machining
  • EDM electrical-discharge machining
  • the longitudinal cylindrical hole 26 can be formed using any machining technique of a conventional type, for example drilling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP09425341A 2009-09-07 2009-09-07 Hochdruck-Kraftstoffspeicher für Common-Rail Kraftstoffeinspritzsystemen Withdrawn EP2299102A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09425341A EP2299102A1 (de) 2009-09-07 2009-09-07 Hochdruck-Kraftstoffspeicher für Common-Rail Kraftstoffeinspritzsystemen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09425341A EP2299102A1 (de) 2009-09-07 2009-09-07 Hochdruck-Kraftstoffspeicher für Common-Rail Kraftstoffeinspritzsystemen

Publications (1)

Publication Number Publication Date
EP2299102A1 true EP2299102A1 (de) 2011-03-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP09425341A Withdrawn EP2299102A1 (de) 2009-09-07 2009-09-07 Hochdruck-Kraftstoffspeicher für Common-Rail Kraftstoffeinspritzsystemen

Country Status (1)

Country Link
EP (1) EP2299102A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2511517A1 (de) 2011-04-15 2012-10-17 Wärtsilä Schweiz AG Hochdruckflüssigkeitsschiene
EP2960486A1 (de) * 2014-06-25 2015-12-30 Robert Bosch Gmbh Verfahren zur reduzierung der spannung an einer verschneidung zweier ineinander einmündenden kanäle
CN110625328A (zh) * 2018-06-25 2019-12-31 德尔福知识产权有限公司 制造共轨的方法
CN112555077A (zh) * 2020-12-03 2021-03-26 一汽解放汽车有限公司 一种共轨管及柴油机高压供油***

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19948341A1 (de) * 1999-10-07 2001-04-19 Bosch Gmbh Robert Kraftstoffhochdruckspeicher
DE19949962A1 (de) * 1999-10-16 2001-04-26 Bosch Gmbh Robert Kraftstoffhochdruckspeicher und Verfahren zur Herstellung eines Kraftstoffhochdruckspeichers
WO2003036075A1 (de) * 2001-10-20 2003-05-01 Robert Bosch Gmbh Hochdruckspeicher wie kraftstoffhochdruckspeicher
WO2004036028A1 (de) * 2002-10-11 2004-04-29 Siemens Aktiengesellschaft Kraftstoffverteiler
US20050144558A1 (en) * 2003-12-24 2005-06-30 Cummins Inc. Juncture for a high pressure fuel system
EP1413744B1 (de) 2002-10-23 2005-12-28 Wärtsilä Schweiz AG Druckspeicher für ein Common Rail System
EP1423601B1 (de) 2001-09-05 2007-03-21 Siemens Aktiengesellschaft Kraftstoffhochdruckspeicher für ein speichereinspritzsystem
WO2008145818A2 (en) * 2007-05-31 2008-12-04 Wärtsilä Finland Oy Fuel storage for a fuel feed system
EP2072802A1 (de) * 2006-10-02 2009-06-24 Bosch Corporation Verteilerleitung und verfahren zur herstellung einer verteilerleitung

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19948341A1 (de) * 1999-10-07 2001-04-19 Bosch Gmbh Robert Kraftstoffhochdruckspeicher
DE19949962A1 (de) * 1999-10-16 2001-04-26 Bosch Gmbh Robert Kraftstoffhochdruckspeicher und Verfahren zur Herstellung eines Kraftstoffhochdruckspeichers
EP1423601B1 (de) 2001-09-05 2007-03-21 Siemens Aktiengesellschaft Kraftstoffhochdruckspeicher für ein speichereinspritzsystem
WO2003036075A1 (de) * 2001-10-20 2003-05-01 Robert Bosch Gmbh Hochdruckspeicher wie kraftstoffhochdruckspeicher
WO2004036028A1 (de) * 2002-10-11 2004-04-29 Siemens Aktiengesellschaft Kraftstoffverteiler
EP1413744B1 (de) 2002-10-23 2005-12-28 Wärtsilä Schweiz AG Druckspeicher für ein Common Rail System
US20050144558A1 (en) * 2003-12-24 2005-06-30 Cummins Inc. Juncture for a high pressure fuel system
EP2072802A1 (de) * 2006-10-02 2009-06-24 Bosch Corporation Verteilerleitung und verfahren zur herstellung einer verteilerleitung
WO2008145818A2 (en) * 2007-05-31 2008-12-04 Wärtsilä Finland Oy Fuel storage for a fuel feed system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2511517A1 (de) 2011-04-15 2012-10-17 Wärtsilä Schweiz AG Hochdruckflüssigkeitsschiene
EP2960486A1 (de) * 2014-06-25 2015-12-30 Robert Bosch Gmbh Verfahren zur reduzierung der spannung an einer verschneidung zweier ineinander einmündenden kanäle
CN110625328A (zh) * 2018-06-25 2019-12-31 德尔福知识产权有限公司 制造共轨的方法
EP3587788A1 (de) * 2018-06-25 2020-01-01 Delphi Technologies IP Limited Verfahren zur common-rail-herstellung
CN112555077A (zh) * 2020-12-03 2021-03-26 一汽解放汽车有限公司 一种共轨管及柴油机高压供油***

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