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WO2003056168A1 - Composant pour systeme d'injection a accumulateur - Google Patents

Composant pour systeme d'injection a accumulateur Download PDF

Info

Publication number
WO2003056168A1
WO2003056168A1 PCT/DE2002/004602 DE0204602W WO03056168A1 WO 2003056168 A1 WO2003056168 A1 WO 2003056168A1 DE 0204602 W DE0204602 W DE 0204602W WO 03056168 A1 WO03056168 A1 WO 03056168A1
Authority
WO
WIPO (PCT)
Prior art keywords
component
injection system
individual
individual bores
bores
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.)
Ceased
Application number
PCT/DE2002/004602
Other languages
German (de)
English (en)
Inventor
Uwe Scharf
Andreas Heinek
Andreas Lenk
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP02791630A priority Critical patent/EP1461526A1/fr
Publication of WO2003056168A1 publication Critical patent/WO2003056168A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • 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 present invention relates to a component for an accumulator injection system, the accumulator injection system injecting fuel from a reservoir (rail) into a combustion chamber of an internal combustion engine, a passage for a fuel flow being provided in the component.
  • Components of storage injection systems of this type are, for example, the rail, in which passages are provided from the storage space of the rail to the injectors, or, for example, the injectors with an integrated inlet throttle or an outlet throttle.
  • the injectors for example, the rail, in which passages are provided from the storage space of the rail to the injectors, or, for example, the injectors with an integrated inlet throttle or an outlet throttle.
  • storage injection systems are usually designed as a single bore as a passage. These holes are only intended to ensure a defined hydraulic flow, with a fluctuation in the hydraulic flow before the hydroerosive rounding usually being in a range from ⁇ 2% to ⁇ 3.5%. However, since the flow rate depends approximately on the square of the diameter, this means that the diameter of the bore may only fluctuate in a range from ⁇ 1% to ⁇ 1.75%. Since the usual bores have a diameter of 50 to 600 ⁇ m, precision bores with diameter fluctuations in the ⁇ m range are required.
  • the component according to the invention for a storage injection system with the features of claim 1 has a passage for a fuel flow.
  • the passage is formed from a large number of individual bores.
  • a plurality of smaller individual bores are thus provided instead of a single bore.
  • a manufacturing method for producing the plurality of individual bores can therefore be used which has a lower accuracy than the eroding methods used in the prior art. It should also be noted that j but one Larger number of individual bores also leads to increased expenditure or to an increasing process time in the production, so that overall there is an optimal number of boreholes which can be determined by a person skilled in the art on the basis of the parameters given.
  • Another advantage of the provision of a plurality of individual bores according to the invention instead of a single bore is that the cavitation reversal point can also be easily influenced thereby. The cavitation reversal point is given by the pressure difference at which the flow no longer depends on the pressure due to cavitation.
  • the cavitation reversal point is therefore a measure of the good flow formation in the borehole.
  • the cavitation reversal point can be influenced by appropriate selection of the individual diameters of the individual bores.
  • Another advantage is that the large number of individual holes has a wall surface that is a factor of «larger than that of a single hole. This leads to a shortened process time in a subsequent hydroerosive rounding, since due to the larger wall area with a large number of individual bores, only a small amount of material has to be removed for a predetermined flow rate in comparison with a single larger bore.
  • the component in which the passage is formed by a plurality of individual bores is preferably an injector with an inlet throttle and / or an outlet throttle, which are provided by the plurality of individual bores.
  • the component is the rail (storage element) of the storage injection system.
  • the plurality of individual bores can each replace a connecting bore between the rail and an injector or a connecting bore between the rail and a pump or other components flanged to the rail.
  • the passage is preferably arranged in a component of the storage injection system at the transition to an adjacent component.
  • the individual bores are each arranged parallel to one another. As a result, in particular larger turbulences when flowing through the large number of parallel individual bores can be prevented.
  • At least one of the individual bores does not run parallel to the other individual bores.
  • all of the individual bores can also be inclined to an imaginary straight flow direction.
  • the inclination is particularly preferred at an angle between 0 ° and 30 °.
  • At least one of the plurality of individual bores is formed with a tapering cross section in or against the flow direction.
  • the individual bore is particularly preferably tapered. Due to this tapering formation of the individual holes, the cavitation reversal point can also be easily set.
  • the conicity of the individual bores is particularly preferably between 0 and
  • the large number of individual bores preferably have the same diameter.
  • the individual bores are particularly preferably arranged on a circle.
  • the individual bores can be produced very quickly, for example by rotating the workpiece in which they are arranged, or by rotating the tool.
  • one of the individual bores is arranged in the middle of a circle and the remaining individual bores are arranged on a circle around the middle individual bore. This allows particularly good flow conditions to be achieved.
  • these are preferably arranged as a rectangle or a square. It is also possible for individual bores to be arranged within the geometric shape delimited by the outer individual bores.
  • the distance between the individual individual bores and the adjacent individual bores is preferably the same.
  • drilling with a laser can also be used to produce the individual holes.
  • very short process times can be achieved with sufficient drill hole quality. It should be noted here that for a single bore, as in the prior art, this quality which can be achieved by means of a laser would not be sufficient, since the fluctuations in the size and roundness of the bore are too great.
  • the absolute borehole quality (fluctuation in diameter and roundness) tends to improve with the transition to smaller bores.
  • An Nd-YAG laser is particularly preferably used here.
  • the laser When producing the large number of individual bores, which are for example in a circle, the laser can be equipped with a specific pulse repetition frequency, so that the workpiece or the laser or both are rotated between the individual laser pulses to produce a single bore, so that the next Pulse sequence an adjacent single hole can be made. This allows the shortest processing times to be achieved, since only the pulse repetition frequency of the laser determines the process time.
  • FIG. 1 shows a schematic top view of a rail with an opening according to a first exemplary embodiment of the present invention
  • FIG. 2 shows a schematic top view of a rail with an opening according to a second exemplary embodiment of the present invention
  • FIG. 3 shows a schematic top view of a rail with a passage according to a third exemplary embodiment of the present invention.
  • FIG. 1 A first exemplary embodiment of the present invention is described below with reference to FIG. 1.
  • the component of the accumulator injection system which has the passage according to the invention is one
  • Rail 1 of the storage injection system As can be seen from FIG. 1, the passage is formed from a multiplicity of individual bores 2 which lie on a circle 3 around a center point M. The diameter of the circle 3 is D.
  • the individual individual bores 2 are spaced equally far apart.
  • the number of individual bores 2 is sixteen, the individual bores 2 each having a diameter of 80 ⁇ m.
  • Such an arrangement of a large number of individual bores 2 can be a conventional Replace hole with a diameter of 320 ⁇ m.
  • the flow after the drilling process must be within ⁇ 2%. This results in a tolerance of approx. ⁇ 1 or ⁇ 3 ⁇ m.
  • Such an individual bore is usually produced by means of spark erosion, the process time being approximately 40 seconds.
  • a plurality of individual holes (namely sixteen) with a diameter of 80 ⁇ m each can now be produced by means of a laser, the area of the plurality of individual holes 2 corresponding to the area of the individual hole in the prior art.
  • These sixteen individual bores 2 can be produced within 4 seconds if the pulse repetition frequency of the laser is 4 Hz.
  • the workpiece 1 is preferably guided on a circular path at 15 rpm. The workpiece 1 thus only moves by 0.4 ⁇ m during the pulse time of 0.4 milliseconds, which corresponds to the pulse length of the laser. Continuous processing of the
  • the laser according to the invention can be used to produce the individual bores 2, as a result of which the process time is significantly reduced.
  • This surprising result in which the quality of the individual boreholes 2 produced by means of a laser is worse than that of an individual borehole produced by spark erosion, brings great manufacturing advantages.
  • the poorer quality (especially dimensional and round accuracy) of the laser created bores can, however, be compensated for by the large number of individual bores 2 with a smaller diameter and thus also with smaller absolute deviations.
  • FIG. 2 shows a component of a storage injection system according to a second exemplary embodiment of the present invention.
  • the same or functionally the same parts are designated with the same reference numerals as in the first exemplary embodiment.
  • the component of the storage injection system is also a rail 1, in which a plurality of individual bores 2, 4 are provided.
  • the individual bores 2, 4 of the second exemplary embodiment again have the same diameter.
  • a single bore 4 is arranged in the center of a circle 3, the other individual bores 2 being arranged on the circle 3 at the same distance. A total of seven individual holes are thus formed in the second exemplary embodiment.
  • Providing a single bore 4 in the center of the circle of the other individual bores 2 can in particular prevent large turbulence when flowing through the passage formed by the plurality of individual bores 2, 4.
  • the diameter of the circle 3 is A.
  • the second exemplary embodiment corresponds to the first exemplary embodiment, so that reference can be made to the description given there.
  • the plurality of individual holes 2 is arranged in a rectangle.
  • the ten lengths of the rectangle defined with B and C.
  • Four individual bores 2 are also provided in the interior of the rectangle.
  • the individual individual bores 2 are each at the same distance from the adjacent individual bores 2 in the vertical or horizontal direction.
  • This arrangement of the individual bores 2 according to the invention also ensures a smooth and continuous flow through the passage. Otherwise, this exemplary embodiment corresponds to the previous exemplary embodiments, so that reference can be made to the description given there.
  • the present invention thus relates to a component for an accumulator injection system, the accumulator injection system injecting fuel into a combustion chamber of an internal combustion engine.
  • a fuel flow through a passage is provided in the component.
  • the passage is formed from a multiplicity of individual bores 2, which replace the single bore present in the prior art.

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 composant pour système d'injection à accumulateur destiné à injecter du carburant dans la chambre de combustion d'un moteur à combustion interne. Il est prévu que ledit composant comporte un passage destiné à être traversé par le flux de carburant. Ledit passage est constitué d'une pluralité d'alésages individuels (2) qui remplacent l'alésage unique de l'état antérieur de la technique.
PCT/DE2002/004602 2001-12-27 2002-12-16 Composant pour systeme d'injection a accumulateur Ceased WO2003056168A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02791630A EP1461526A1 (fr) 2001-12-27 2002-12-16 Composant pour systeme d'injection a accumulateur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10164178 2001-12-27
DE10164178.8 2001-12-27

Publications (1)

Publication Number Publication Date
WO2003056168A1 true WO2003056168A1 (fr) 2003-07-10

Family

ID=7711002

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/004602 Ceased WO2003056168A1 (fr) 2001-12-27 2002-12-16 Composant pour systeme d'injection a accumulateur

Country Status (2)

Country Link
EP (1) EP1461526A1 (fr)
WO (1) WO2003056168A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19636396A1 (de) * 1996-09-07 1998-03-12 Bosch Gmbh Robert Brennstoffeinspritzventil
JPH10288124A (ja) * 1997-04-15 1998-10-27 Usui Internatl Ind Co Ltd コモンレール
US5911366A (en) * 1993-03-06 1999-06-15 Robert Bosch Gmbh Perforated valve spray disk

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5911366A (en) * 1993-03-06 1999-06-15 Robert Bosch Gmbh Perforated valve spray disk
DE19636396A1 (de) * 1996-09-07 1998-03-12 Bosch Gmbh Robert Brennstoffeinspritzventil
JPH10288124A (ja) * 1997-04-15 1998-10-27 Usui Internatl Ind Co Ltd コモンレール

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 01 29 January 1999 (1999-01-29) *

Also Published As

Publication number Publication date
EP1461526A1 (fr) 2004-09-29

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