EP2167810B1 - Accumulateur haute pression de carburant - Google Patents

Accumulateur haute pression de carburant Download PDF

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Publication number
EP2167810B1
EP2167810B1 EP08761008.5A EP08761008A EP2167810B1 EP 2167810 B1 EP2167810 B1 EP 2167810B1 EP 08761008 A EP08761008 A EP 08761008A EP 2167810 B1 EP2167810 B1 EP 2167810B1
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EP
European Patent Office
Prior art keywords
pressure
diameter
pressure accumulator
accumulator body
basic shape
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.)
Active
Application number
EP08761008.5A
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German (de)
English (en)
Other versions
EP2167810A1 (fr
Inventor
Arthur Eberhart
Christoffer Uhr
Johannes Edlmayr
Guenter Eisenhut
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
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Publication date
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Publication of EP2167810A1 publication Critical patent/EP2167810A1/fr
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Publication of EP2167810B1 publication Critical patent/EP2167810B1/fr
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    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8069—Fuel injection apparatus manufacture, repair or assembly involving removal of material from the fuel apparatus, e.g. by punching, hydro-erosion or mechanical operation

Definitions

  • high-pressure accumulator injection systems In internal combustion engines, such as self-igniting internal combustion engines fuel injection systems shown, today, among other things, high-pressure accumulator injection systems (common rail) are used.
  • the high-pressure accumulator injection system comprises a high-pressure feed pump with which a system pressure level is built up and maintained in a high-pressure accumulator body (common rail).
  • Fuel is injected into the combustion chambers of the self-igniting internal combustion engine via a plurality of fuel injectors connected to the high-pressure accumulator body, which are in communication with the high-pressure accumulator body (common rail) via high-pressure lines. From the fuel injectors leakage and repelled amount via a return system usually fed back into the tank of the fuel injection system, from where it is fed again, possibly with the interposition of an electric fuel pump, the high-pressure pumping unit.
  • the high-pressure storage body is so far from a rod-shaped except for the threaded connections blank, which is a master or forming part, produced by machining.
  • the maximum voltages In the range of intersections of a introduced into the rod-shaped deep hole, which defines the fuel volume within the high-pressure accumulator body, and the radial bores in the wall of the high-pressure accumulator body to the individual high pressure connections occur in operation under pressure load of the high-pressure accumulator body, the maximum voltages. These intersections represent the point relevant to failure and determine the strength and thus the design of the high-pressure accumulator body (common rail) substantially.
  • a reduction of the stress load in the region of the points of intersection of the deep hole bore with the individual radial bores to the high pressure ports can be achieved by increasing the outer diameter of the high pressure reservoir body while maintaining the inner diameter of the high pressure reservoir body. This reduction of Stress in the intersecting areas, however, asymptotically approaches a threshold. The associated with this solution material and weight would be disproportionately large.
  • DE 199 48 338 A1 a method for processing a high-pressure fuel storage, a high-pressure fuel storage with connecting pieces and the application of the method for processing known.
  • the common rail fuel injection system according to DE 199 48 338 A1 includes a body equipped with multiple ports. The main body is deformed in the area of the connection openings. In the region of the connection openings in each case a through hole is provided which has two sections with different inner diameters.
  • the connecting pieces are designed such that the outer diameter of the connecting piece at its end facing the high-pressure fuel accumulator end substantially corresponds to the inner diameter of the portion of the through-hole in the high-pressure fuel high-pressure accumulator.
  • a high-pressure fuel storage is known, which is particularly suitable for use in a common rail fuel injection system of an internal combustion engine.
  • the high-pressure fuel accumulator comprises a tubular base body having a longitudinally extending blind hole and a plurality of terminals.
  • a sealing plug is arranged in the closed end of the blind bore.
  • DE 39 32 672 A1 refers to a blank for producing a fuel supply manifold for an injection system of an engine.
  • an axial fuel passage is formed in an tubular part.
  • Several sleeves are laterally from the tubular part. Each sleeve communicates with the axial fuel passage and forms a seat for a fuel metering and atomizing valve in its interior.
  • An extension extends radially at one end of the tubular member and forms a seat for a pressure regulator.
  • the blank is made of molten metal by injection molding.
  • DE 199 45 316 A1 refers to a high-pressure fuel storage, the interior of which is arranged eccentrically in the base body relative to the longitudinal axis of the base body is.
  • the high-pressure resistance of the high-pressure fuel accumulator is primarily limited by the intersections between the connection openings and the main body.
  • the highest forces act on the transitions between the connection openings for the high-pressure lines to the individual fuel injectors to be supplied with fuel under system pressure and the main body.
  • a relative displacement of the interior in a first plane of the base of the fracture endangered transition region of the intersections is relieved or stabilized, so that an increase in the high pressure resistance of the high-pressure fuel storage by the solution DE 199 45 316 A1 can achieve.
  • the base body is provided in cross-section with a substantially elliptical outer contour, wherein the connection openings are arranged in the longitudinal direction of the main axis of the ellipse.
  • the substantially elliptical outer contour leads under high pressure loading of the interior of the tubular base body to the fact that the interior of the tubular body expands transversely to the main axis of the ellipse. The resulting strains in the main body ensure that the fracture-prone area of the intersections is relieved.
  • the geometry of the high-pressure storage body (common rail) in such a way that, by increasing the axial elongation acting in the axial direction, a tapering of the outer diameter between the individual high-pressure connections in combination with a locally reduced reduction of the transverse expansion by a material reduction on the side the high-pressure storage body, which is opposite to the respective Verschneidungsstelle, a more uniform stress distribution in the region of the intersection is achieved.
  • the material reduction is designed as a wall thickness reduction in the form of a flat flattening.
  • the material expenditure and thus the weight of the high-pressure storage body can advantageously be reduced considerably at the same time for reducing the stress.
  • this leads to a lower weight of the high-pressure storage body with increased high-pressure resistance; on the other hand, the amount of material used is reduced, which contributes to a not insignificant reduction in material costs in mass production.
  • the inventively proposed, substantially tubular high-pressure storage body has in one-piece form high-pressure connections and between these a tapered outer diameter.
  • a suitable diameter ratio d / D is in the range between 0.4 and 0.75, where D denotes the diameter of the high-pressure storage body without a taper and d the diameter of the high-pressure storage body at the taper.
  • a width b of the dome in the region of the sections remaining in the cylindrical basic shape of the high-pressure storage body in the region of the high-pressure connections is between 0.6 and 0.85 relative to the diameter of the basic cylindrical shape, ie.
  • a transition radius r from the outer surface to the dome-shaped elevation in the region of the high-pressure ports is formed to be smaller than the difference of d, the diameter of the body at the taper point, and D, the original diameter of the high-pressure reservoir body, i. r ⁇ (D - d).
  • the essentially high-pressure storage body which is essentially cylindrical in its basic form, has flattenings in one-piece form on the cylinder half opposite the bore intersection. These flats serve the purpose of reducing the bending strength of the cross-section at the side opposite the bore intersection.
  • a flat flattening is formed which contacts the taper diameter and the circular transition from the taper diameter to the base diameter in the plane of symmetry.
  • FIG. 1 The representation according to FIG. 1 is a high pressure storage body according to the prior art can be seen.
  • FIG. 1 shows a high pressure storage body 10, on the lateral surface 14, a number of domes 12 is formed.
  • the dome 12 each represent high pressure ports 28, in which FIG. 1 not shown high-pressure lines are connected, via which the system pressure generated in the high-pressure accumulator body 10 to in FIG. 1 also not shown fuel injectors a high-pressure accumulator injection system (common rail) is applied.
  • a pressure regulating valve 16 On the end faces of the tubular high-pressure accumulator body 10 there is, on the one hand, a pressure regulating valve 16 and, on the opposite front side, a stopper identified by reference numeral 18.
  • the high-pressure storage body 10 has a constant outer diameter 20.
  • a plurality of fastening points 24 are provided, with which the high-pressure accumulator body 10 is fixed in the cylinder head area of the fuel to be supplied to the internal combustion engine.
  • Each of the attachment points 24 includes a bore 26; the dome 12 on the lateral surface 14 of the Prior art high pressure accumulator bodies 10 serve as high pressure ports 28 and typically include a threaded portion.
  • FIG. 2 shows an embodiment of the inventively proposed high-pressure storage body with regions which are formed in a tapered diameter relative to a basic shape.
  • FIG. 2 can be taken that the there reproduced in perspective view high-pressure storage body 10 (common rail) on its lateral surface 14 is also provided with a number of domes 12, which serve as high pressure ports 28.
  • Analogous to in FIG. 1 illustrated high-pressure storage body 10 includes the in FIG. 2 represented according to the invention proposed high-pressure accumulator body 10 at its end faces the control valve or the plug 18th
  • high-pressure accumulator body 10 Unlike in FIG. 1 illustrated high-pressure accumulator body 10 are located at the invention proposed high-pressure accumulator body 10 between individual high-pressure connections 28 sections 42 in which the high-pressure accumulator body 10 is formed with a tapered diameter 46, on which the lateral surface 14 compared to the diameter 44 of a basic shape 40, which corresponds to the cylindrical shape 52, returns.
  • the suitable diameter ratio of the diameters 46 to 44 is between 0.4 and 0.75.
  • FIG. 3 shows a representation of the inventively proposed high-pressure storage body in the region of a dome for a high pressure port.
  • FIG. 3 shows that the Verschneidungsstelle 56 of a transverse bore 58 which passes through the dome 12, with the longitudinal bore produced as a cavity 54 of the cylinder produced in the form of 52 high-pressure accumulator 10 is formed.
  • the dome 12 rises in the transition radius 50.
  • a width in which the dome 12 together with high pressure ports 28 on the lateral surface 14 of the invention proposed high-pressure accumulator 10 is designated by reference numeral 48.
  • a flat 64 is formed at the opposite side of the high pressure port 28 68. This results in a reduced circumferential expansion in the intersection region 56 due to the constrictions obtained.
  • the transition radius 50 of the basic shape 40, ie the cylindrical shape 52 on the sections 42 formed in tapered outer diameter 46 is preferably chosen to be smaller than the difference in the diameters of the basic body, i. of the diameter 44, and the diameter of the tapered portions 42, i. the diameter 46.
  • FIG. 4 is a cross section through a not according to the invention proposed high-pressure body in the range of a high-pressure connection can be seen.
  • the Verschneidungsstelle 56 which represents the most critical component site.
  • the transverse bore 78 extends through the dome 12, on the outside of the threaded portion 58 extends.
  • high pressure connection 28 to be connected high-pressure fuel line is connected to the high-pressure accumulator body 10.
  • this has a flattening 64 on.
  • the flattening 64 is formed on the lateral surface 14 of the high pressure storage body 10 of the Verschneidungsstelle 56 directly opposite rounded.
  • the inventively proposed high-pressure accumulator body 10 in the lateral surface 14, each having a transverse bore 78 of a high pressure port 28 opposite.
  • a reduction of the stresses can be achieved by an increased strain 60 in the axial direction and a reduced strain in the radial direction.
  • the voltage optimization in the area of the Verschneidungsstelle 76 means there a reduction of the maximum voltage and in other areas an increase in the base voltages, ie in the non-critical area outside of the Verschneidungsstellen 56 between the transverse bores 78 and the cavity 74, the ground voltage level is increased.
  • FIG. 5 shows a schematic representation of a comparison of the diameter 44 formed as a cylinder 52 basic shape 40 of the high-pressure accumulator body 10.
  • the tapered diameter 46 which on the high-pressure storage body 10 in the region of a flat 64 (see FIG FIG. 4 ) is formed, gradually from the diameter 44 of the basic mold 40 can be reduced until this on the in FIG. 5 hatched shown residual wall thickness between the lateral surface 14 and the cavity 54 (longitudinal bore) can be returned.
  • the flattening 64 is on the opposite side of the Verschneidungsstelle 56, that is formed in the bottom 68 of the high-pressure accumulator body 10.
  • FIG. 6.1 shows, for example, the Figure 6.1 the formation of a flat flattening 72 of the lateral surface 14 of the inventively proposed high-pressure storage body 10.
  • the flat flat 72 coincides with the tapered diameter 46.
  • the in Figure 6.1 schematically shown flat flattening 72 the advantage of cost-effective manufacturability by means of a machining production of the inventively proposed high-pressure storage body 10.
  • the sectional view according to Figure 6.1 It can be seen that, apart from the flattening 72, the basic shape 40 of the high-pressure accumulator body 10 is given by the cylindrical shape 52.
  • the flat flattening 72 lies in the floor area (see position 68 in FIG. 4 ) at the point of intersection 56 opposite side of the high-pressure accumulator body 10th
  • Figure 6.2 shows an alternative non-inventive geometry of a material reduction, in which on the circumference of the lateral surface 14 of the inventively proposed high-pressure storage body 10 lying in its plane of symmetry, a circular flattening 76 is formed.
  • this represents a transition from the tapered diameter 46 to the diameter 44 of the basic shape 40.
  • This lies in the plane of symmetry of the inventively proposed high-pressure storage body 10, so that a symmetrical stress distribution and in particular a reduction of the maximum stress in the Verschipungsstelle 56 between the transverse bore 78 of the high-pressure ports 28 and the longitudinal direction of the high-pressure storage body 10 extending longitudinal bore, which represents the cavity 54 adjusts.
  • Figure 6.3 shows an arc-shaped flattening 74 in the bottom region of a non-inventively proposed high-pressure storage body 10, with the reduction of the maximum stress in the Verschneidungsstelle 56 between the transverse bore 78 of the high-pressure port 28 and formed as a longitudinal bore cavity 54 of the high-pressure accumulator body 10 can be achieved.
  • FIG. 6.1 illustrated flat flattening 72 and the in Figure 6.2 shown, lying in the plane of symmetry of the high-pressure accumulator body 10, circular trained flattening 76 on the respective intersection point 56 opposite side 68 of the high-pressure accumulator body 10 reach.

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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)

Claims (6)

  1. Corps d'accumulateur haute pression (10) pour un système d'injection de carburant haute pression dans des chambres de combustion de moteurs à combustion interne, comprenant une pluralité de raccords haute pression (28) dans une surface d'enveloppe (14), une cavité (54) qui forme des zones d'intersection (56) avec des alésages transversaux (78) des raccords haute pression (28), le diamètre (46) du corps d'accumulateur haute pression (10) étant rétréci dans des portions (42) entre les raccords haute pression (28) et une réduction de matériau (64, 72, 74, 76) étant réalisée au niveau de celui-ci du côté (68) opposé aux zones d'intersection respectives (56), la réduction de matériau (64, 72, 74, 76) étant réalisée sous forme de réduction de l'épaisseur de la paroi du côté (68), en particulier du fond du corps d'accumulateur haute pression (10), caractérisé en ce que la réduction de matériau est réalisée sous forme d'aplatissement plan (72).
  2. Corps d'accumulateur haute pression (10) selon la revendication 1, caractérisé en ce que celui-ci présente une forme de base (40) essentiellement cylindrique (52).
  3. Corps d'accumulateur haute pression (10) selon la revendication 1, caractérisé en ce que le rapport du diamètre rétréci (46) au diamètre (44) de la forme de base (40) est compris entre 0,45 et 0,75.
  4. Corps d'accumulateur haute pression (10) selon la revendication 2, caractérisé en ce que les raccords haute pression (28) sont réalisés sous forme de dôme (12) dans des régions du corps d'accumulateur haute pression (10) conservant leur forme de base (40) cylindrique (52), avec une largeur (48) qui correspond à 0,6 à 0,85 fois le diamètre (44) de la forme de base (40).
  5. Corps d'accumulateur haute pression (10) selon la revendication 1, caractérisé en ce qu'un rayon de transition (50) du diamètre (44) de la forme de base (40) au diamètre rétréci (46) est inférieur à la différence entre le diamètre (44) de la forme de base (40) et le diamètre rétréci (46).
  6. Corps d'accumulateur haute pression (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'aplatissement plan (72) est en contact avec le diamètre rétréci (46).
EP08761008.5A 2007-07-23 2008-06-13 Accumulateur haute pression de carburant Active EP2167810B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710034720 DE102007034720A1 (de) 2007-07-23 2007-07-23 Kraftstoffhochdruckspeicher
PCT/EP2008/057485 WO2009013070A1 (fr) 2007-07-23 2008-06-13 Accumulateur haute pression de carburant

Publications (2)

Publication Number Publication Date
EP2167810A1 EP2167810A1 (fr) 2010-03-31
EP2167810B1 true EP2167810B1 (fr) 2016-10-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08761008.5A Active EP2167810B1 (fr) 2007-07-23 2008-06-13 Accumulateur haute pression de carburant

Country Status (3)

Country Link
EP (1) EP2167810B1 (fr)
DE (1) DE102007034720A1 (fr)
WO (1) WO2009013070A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012222448A1 (de) 2012-12-06 2014-06-26 Robert Bosch Gmbh Hochdruckspeicher für ein Kraftstoffeinspritzsystem und Verfahren zur Montage eines Hochdruckspeichers
EP3196457A4 (fr) * 2014-09-17 2018-05-02 Hitachi Automotive Systems, Ltd. Rampe de carburant

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT214868Z2 (it) 1988-09-30 1990-07-04 Weber Srl Semilavorato per realizzare un collettore di alimentazione del carburante per un dispositivo di alimentazione di un motore a combustione interna
DE19913793A1 (de) * 1999-03-26 2000-10-19 Daimler Chrysler Ag Verfahren zum Herstellen einer Hochdruckleitung
DE19936533A1 (de) 1999-08-03 2001-02-15 Bosch Gmbh Robert Kraftstoffhochdruckspeicher
DE19945316A1 (de) 1999-09-22 2001-04-05 Bosch Gmbh Robert Kraftstoffhochdruckspeicher
DE19948338A1 (de) 1999-10-07 2001-04-12 Bosch Gmbh Robert Verfahren zur Bearbeitung eines Kraftstoffhochdruckspeichers, Kraftstoffhochdruckspeicher und Anschlussstutzen zur Anwendung des Verfahrens
DE10056405B4 (de) * 2000-11-14 2005-06-16 Robert Bosch Gmbh Kraftstoffhochdruckspeicher für ein Kraftstoffeinspritzsystem für Brennkraftmaschinen
DE10152261A1 (de) * 2001-10-20 2003-04-30 Bosch Gmbh Robert Hochdruckspeicher wie Kraftstoffhochdruckspeicher
JP2008095629A (ja) * 2006-10-13 2008-04-24 Bosch Corp コモンレール

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2167810A1 (fr) 2010-03-31
WO2009013070A1 (fr) 2009-01-29
DE102007034720A1 (de) 2009-01-29

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