EP1395748B1 - Element d'etancheite haute pression pour injecteurs - Google Patents

Element d'etancheite haute pression pour injecteurs Download PDF

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Publication number
EP1395748B1
EP1395748B1 EP02735073A EP02735073A EP1395748B1 EP 1395748 B1 EP1395748 B1 EP 1395748B1 EP 02735073 A EP02735073 A EP 02735073A EP 02735073 A EP02735073 A EP 02735073A EP 1395748 B1 EP1395748 B1 EP 1395748B1
Authority
EP
European Patent Office
Prior art keywords
sealing element
injector
pressure chamber
pressure
insert part
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.)
Expired - Lifetime
Application number
EP02735073A
Other languages
German (de)
English (en)
Other versions
EP1395748A1 (fr
Inventor
Siegfried Ruthardt
Tibor Bauer
Wolfgang Ballerstedt
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
Priority claimed from DE10220457A external-priority patent/DE10220457A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1395748A1 publication Critical patent/EP1395748A1/fr
Application granted granted Critical
Publication of EP1395748B1 publication Critical patent/EP1395748B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • Fuel injection systems for air-compressing internal combustion engines come today injection systems with high-pressure accumulation space (Common Rail) are used.
  • the Fuel injection systems further include injectors for injecting fuel into the combustion chambers of the internal combustion engine, the in the fuel injection system prevailing pressures in terms of tightness and material resistance.
  • annular sealing elements are used on injectors with which a seal of the high pressure area of the injector against low areas Pressure of the injector is made. Will the pressure level in fuel injection systems for generating a higher thermodynamic efficiency of the internal combustion engine raised, the demands on the sealing elements of the Fuel injector.
  • EP-A 0 483 770 relates to a high-pressure sealing system for the control valve of an electromagnetic Fuel injection valve for internal combustion engines.
  • This high pressure seal system comprises a sealing ring made of a deformable material between a pair of substantially parallel surfaces of the valve body and a Hollow body is compressed. These surfaces are with a high degree of precision edited in order to achieve a minimum margin.
  • a fuel injection valve for high-pressure injection.
  • the High-pressure injection is used in self-igniting internal combustion engines and the Control of injection includes a solenoid valve.
  • a control circuit is provided which is in a first circuit part and a split second circuit part.
  • the second circuit part is of the first circuit part, which together serves to control multiple injectors, separated on each arranged individual injection valve.
  • the housing is clipped onto the fuel injection valve and traversed inside the fuel for cooling.
  • a sealing ring made of bronze-reinforced Teflon and a metallic support ring are inserted between the housing and a recessed in this insert below the control room.
  • the support ring of metallic material is required to improve the sealing effect of the bronze reinforced Teflon ring and to prevent the extrusion of the bronze reinforced Teflon ring.
  • appropriate measures must be taken.
  • a further injection valve according to the preamble of claim 1 is shown in WO 99 37 909 A. Presentation of the invention
  • the solution according to the invention can be compared to that of the prior art known solution on the one hand to save a component and on the other hand in the pressure chamber prevailing pressure at high pressure loading e.g. via the inlet from the high-pressure collecting chamber (Common rail) to support the sealing force of the sealing element deploy.
  • the sealing element according to the proposed invention frictionally by means of a press fit on a recessed in the injector housing of the fuel injector Shrunk insert is a manufacturing technology particularly easy to produce solution given.
  • the sealing element Due to the one-piece design of the sealing element can be an uncomplicated installation be achieved; In addition, this offers by means of a press fit on the lateral surface of the insert part fastenable sealing element a Abdichtpotential, which also further pressure level increases withstand in the fuel injector of fuel injection systems, so that as well at further increasing pressures, the sealing of the high pressure region of the pressure chamber is ensured at the fuel injector.
  • the sealing of the high-pressure region of the fuel injector is preferably carried out with a Press fit between the sealing element inner diameter and valve element / ram / or Nozzle needle OD differences between 0.04 to 0.15 mm.
  • Figure 1 is a longitudinal section through the components of a fuel injector and the Injector housing to remove.
  • the representation according to FIG. 1 can be taken from that in a fuel injection system inserted fuel injector 1 for injecting fuel an injector 2 includes.
  • the injector housing 2 of the fuel injector 1 contains a pressure chamber 3, from whose pressure chamber bottom 5 extends from a bore 6 through the injector housing 2.
  • the bore 6 is penetrated by a rotationally symmetrical insert part 7.
  • the insert 7 may in its axial extent of a cylindrical cross section in go over a frusto-conical tapered paragraph. Between the circumference 8 of the insert 7 and the wall of the bore 6 is required for assembly reasons Annular gap 18.
  • an injection valve member 26 for example formed as a valve piston shown in Figure 1, received in accordance with of the double arrow shown in Figure 1, reference numeral 47, a vertical Lifting movement for opening / closing of injection openings, not shown in Figure 1 at the combustion chamber end of the fuel injector 1 is used.
  • the formed in the interior of the injector 2 pressure chamber 3 is except through the Pressure chamber bottom 5 bounded by the wall 4 of the injector 2.
  • the pressure chamber 3 is a high-pressure inlet 21 shown in dashed lines, which at an estuarine point 20 opens into the pressure chamber 3, with the high pressure port 22 of the high pressure source in connection.
  • the mouth 20 of the high pressure inlet 21 is preferred at a strength-optimized location of the wall 4 of the pressure chamber 3 in the interior the injector housing 2.
  • a sealing element 9 is received, which by the in the pressure chamber 3 prevailing high pressure on the one edition 17 forming Pressure chamber bottom 5 is pressed.
  • the pressure prevailing in the pressure chamber 3 high pressure acts on the integrally formed sealing element 9 at the first annular surface 12, which represents the effective hydraulic pressure for the upcoming hydraulic pressure force.
  • the sealing element 9 is preferably formed in one piece and of annular shape.
  • the integrally formed sealing element 9 is connected by a non-positive connection 14, for example a press fit, received on the circumference 8 of the insert part 7.
  • the Press fit 14 is made by differences in the inner diameter of the one-piece formed sealing element 9 and the outer diameter of the insert 7 causes which can be between 0.04 to 0.15 mm.
  • the one-piece ring element which is preferably made of metallic material or an alloy of metallic materials exists, it can be shrunk onto the circumference 8 of the insert part 7.
  • the integrally formed sealing element 9 may e.g. made of aluminum or an aluminum alloy consist.
  • Between the peripheral surface 8 of the insert part 7 and the inner diameter the one-piece sealing element 9 made of metallic material can be a non-positive Connection in the form of a press fit 14 by cold pressing of the metallic Material manufactured sealing element 9 on the peripheral surface 8 of the insert part 7 done.
  • a corresponding radial force which the strength of the press fit 14 between insert 7 and integrally formed Sealing element 9 determined.
  • the sealing element 9 has a first annular surface 12 which is the Assigns pressure chamber 3 and another, the pressure chamber bottom 5 zu josde second ring surface.
  • the pressure chamber bottom acts as a support 17 which a between the peripheral surface 8 of the insert part 7 and the bore 6 within the injector 2 required for assembly reasons Annular gap 18 sealing closes.
  • the sealing effect of the sealing element 9 is determined by the increased in the pressure chamber 3 pending fuel pressure, since in the pressure chamber. 3 prevailing pressure in the direction 19 (see illustration according to Figure 2), the sealing element 9 acted upon in the direction of the pressure chamber bottom 5 of the pressure chamber.
  • the control chamber 25 is on the one hand by the insert part 7 and on the other hand by a in this guided valve component 26, for example, designed as a valve piston can be limited.
  • a in this guided valve component 26 may have a contour 26.1 exhibit.
  • a frusto-conical Form area 26.2 which has a complementarily shaped conical area 27.1 at the outlet 27 on the outlet side of the control chamber 27 cooperates.
  • From the control room 25 extends from a drain 27, in which a flow restrictor 28 is received is.
  • the outlet throttle 28, via which upon actuation of a here designed as a spherical body Closing element 29 a pressure relief of the control chamber 25 is brought about is on End of the expiration 27 arranged. That the outlet throttle 28 releasing or closing Schliesselement 29 is partially surrounded by a molding 30, which at a lower end face of an anchor part 31 of a magnet arrangement for actuating the fuel injector 1 is arranged.
  • the anchor part 31 is formed integrally and comprises a bolt part and a plate-shaped configured part.
  • the fastening screw 33 is screwed into an internal thread 45 of the injector housing 2 and is located at an upper End face 32 of the insert part 7 at.
  • anchor member 31 of the actuator assembly is acted upon by a spring element 35, which is guided in a sleeve.
  • the sleeve 35 surrounding the spring element is surrounded by a magnetic coil 36, the in turn can be accommodated in a magnet sleeve 37.
  • On the outer peripheral surface the magnet sleeve 37 is an annular projection 38 formed on which a union nut 39 is applied.
  • the magnet sleeve 37 is screwed through the union nut 39 with an external thread 40 on the outside of the injector 2 of the Fuel injector 1 causes.
  • the integrally formed armature part 31 of the actuator assembly is partially in one Insert sleeve 41 out, with the interposition of a spacer ring 42 via the magnet sleeve 38 is fixed, which in turn via the union nut 39 on the external thread 40 of the injector 2 is fixed.
  • an O-ring Made of elastic material executable sealing element 43 is between the magnet sleeve 38 and the injector housing 2, which are connected to each other via the union nut 39.
  • a Bore 44 is formed, which via a connection not shown here with the high pressure port 22 is the high-pressure source of the fuel injector 1 in fluid communication and a nozzle space also not shown in Figure 1, which is also not shown Injector valve member surrounds, acted upon by high pressure fuel.
  • the injection valve member serving as a nozzle needle with the combustion chamber side seat may be formed, is actuated by a pressure relief of the control chamber 25, the by the by means of the fixing screw 33 in the injector 2 fixed insert part. 7 on the one hand and by the valve component 26 on the other hand limited.
  • the pressure relief / pressurization the control chamber 25 is effected by an actuation of the solenoid valve arrangement, e.g. via the energization of the solenoid coil 36.
  • FIG. 2 shows a reproduction of the detail Z according to FIG. 1 on an enlarged scale.
  • the sealing element 9 On the circumference 8 of the fixed by means of the fastening screw 33 in the injector 2 insert part 7, the sealing element 9 by a frictional connection 14 in shape attached to a press fit.
  • sealing element 9 causes a pressing of the metallic or alloys of metallic materials existing sealing element 9 to the pressure chamber bottom 5, i. is an increase in sealing force between the insert 7 and the injector 2 low.
  • Outer diameter of the sealing element 9 is identified by reference numeral 10, while the inner diameter 11, with the outer diameter of the insert 7, the non-positive connection 14 in the form of a press fit causes, and the outer diameter 10 opposite.
  • annularly shaped sealing element. 9 for sealing the annular gap 18 between insert 7 and the bore 6 within the Injector 2 chamfers 15 and 16 may be formed.
  • the Shape may be shaped such that the end face of the valve component 26 has a frustoconical Section 26.2, with a complimentarily formed drain cone. 27 of the sequence 27 protrudes. On the outer circumferential surface of the valve component 26 one or more annular grooves, as shown in Figure 2, are formed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un injecteur utilisé pour injecter du carburant dans la chambre de combustion d'un moteur à combustion interne. Cet injecteur (1) comprend un corps (2), dans lequel est formée une chambre de pression (3) qui entoure un insert (7). Cette chambre de pression peut être remplie avec du carburant sous haute pression par l'intermédiaire d'une conduite haute pression (21). Une chambre de commande (25) est mise sous pression par l'intermédiaire de la chambre de pression (3). Cette chambre de commande (25) est délimitée par l'insert (7) bloqué dans un alésage (6, 46) du corps (2) de l'injecteur et par une soupape (26). Cette soupape (26) peut se déplacer à l'intérieur de l'insert (7) pour effectuer une course (47). Sur la périphérie (8) de l'insert (7) est logé un élément d'étanchéité (9) métallique monobloc, par liaison de force (14). Cet élément d'étanchéité (9) est exposé à la pression élevée régnant dans la chambre de pression (3).

Claims (8)

  1. Injecteur pour injecter du carburant dans la chambre de combustion d'un moteur à combustion interne, comprenant un boítier d'injecteur (1) dans lequel est formée une chambre de pression (3) munie d'un fond de chambre de pression (5) et qui en entourant un insert (7), peut être remplie par l'intermédiaire d'une conduite d'alimentation haute pression (21) avec du carburant sous haute pression et peut alimenter une chambre de commande (25), en pression délimitée par l'insert (7) fixé dans le boítier d'injecteur (2) dans un alésage (6, 46) et par un composant de soupape (26), le composant de soupape (26) exécutant à l'intérieur de l'insert (7) une course (47), un élément d'étanchéité (9) monobloc étant logé à la périphérie (8) de l'insert (7), l'élément d'étanchéité (9) fournissant une première surface annulaire (12) à la chambre de pression (3) qui est exposée à la haute pression régnant dans la chambre de pression (3), et l'élément d'étanchéité (9) étant appliqué par une deuxième surface annulaire (13) située en regard de la première surface annulaire (12) contre le fond de chambre de pression (5),
    caractérisé en ce que
    l'élément d'étanchéité (9) est métallique et logé par un ajustage serré (14) à la périphérique de l'insert (7).
  2. Injecteur selon la revendication 1,
    caractérisé en ce que
    l'élément d'étanchéité (9) est réalisé à partir d'un matériau métallique ou d'alliages de matériaux métalliques.
  3. Injecteur selon la revendication 2,
    caractérisé en ce que
    l'élément d'étanchéité (9) présente la forme d'une bague en aluminium.
  4. Injecteur selon la revendication 1,
    caractérisé en ce que
    l'élément d'étanchéité (9) monobloc est logé par un ajustage serré (14) à la périphérie de l'insert (7).
  5. Injecteur selon la revendication 4,
    caractérisé en ce que
    les différences de diamètre entre le diamètre intérieur (11) de l'élément d'étanchéité (9) et le diamètre extérieur de l'insert (7) se situent entre 0,04 et 0,15 mm.
  6. Injecteur selon la revendication 1,
    caractérisé en ce qu'
    une fente annulaire (18) entre l'insert (7) et l'alésage (6) à l'intérieur du boítier d'injecteur (2) est fermée lorsque la deuxième surface annulaire (13) de l'élément d'étanchéité (9) monobloc est appliquée contre le fond de chambre de pression (5) de la chambre de pression (3).
  7. Injecteur selon la revendication 1,
    caractérisé en ce que
    la chambre de pression (3) formée dans le boítier d'injecteur (2) est étanchée dans sa zone supérieure par un point d'étanchéité (34) formé entre une surface annulaire de l'insert (7) et une surface de limitation d'un segment d'alésage (46) et dont la force de serrage est définie par un élément de fixation (33) logeable dans le boítier d'injecteur (2).
  8. Injecteur selon la revendication 1,
    caractérisé en ce que
    la chambre de pression (3) est délimitée à l'intérieur du boítier d'injecteur (2) par une paroi (4) qui présente un segment à diamètre évasé dans lequel se situe un orifice de sortie (20) d'une conduite d'alimentation haute pression (21).
EP02735073A 2001-05-21 2002-05-21 Element d'etancheite haute pression pour injecteurs Expired - Lifetime EP1395748B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10124602 2001-05-21
DE10124602 2001-05-21
DE10220457 2002-05-07
DE10220457A DE10220457A1 (de) 2001-05-21 2002-05-07 Hochdruckdichtelement für Injektoren
PCT/DE2002/001841 WO2002095217A1 (fr) 2001-05-21 2002-05-21 Element d'etancheite haute pression pour injecteurs

Publications (2)

Publication Number Publication Date
EP1395748A1 EP1395748A1 (fr) 2004-03-10
EP1395748B1 true EP1395748B1 (fr) 2005-05-18

Family

ID=26009348

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02735073A Expired - Lifetime EP1395748B1 (fr) 2001-05-21 2002-05-21 Element d'etancheite haute pression pour injecteurs

Country Status (4)

Country Link
US (1) US6845756B2 (fr)
EP (1) EP1395748B1 (fr)
JP (1) JP4181419B2 (fr)
WO (1) WO2002095217A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10259950A1 (de) * 2002-12-20 2004-07-01 Robert Bosch Gmbh Steuerventil für Injektoren, insbesondere Common-Rail-Injektoren von Brennkraftmaschinen
DE102004015133A1 (de) * 2003-11-03 2005-06-02 Robert Bosch Gmbh Injektor
JP2005248847A (ja) * 2004-03-04 2005-09-15 Bosch Automotive Systems Corp 燃料通路のシール構造及びそのシール構造を備えた燃料噴射弁
JP2005248846A (ja) * 2004-03-04 2005-09-15 Bosch Automotive Systems Corp 燃料通路のシール構造及びそのシール構造を備えた燃料噴射弁
DE102004024527A1 (de) * 2004-05-18 2005-12-15 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung
ES2277229T3 (es) * 2004-06-30 2007-07-01 C.R.F. Societa Consortile Per Azioni Servovalvula para controlar el inyector de combustible de un motor de combustion interna.
WO2006042488A1 (fr) * 2004-10-21 2006-04-27 Robert Bosch Gmbh Injecteur de carburant
DE102005015735A1 (de) * 2005-04-06 2006-10-12 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102005016010A1 (de) * 2005-04-07 2006-10-12 Robert Bosch Gmbh Ventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine
DE102005026513A1 (de) * 2005-06-09 2006-12-14 Robert Bosch Gmbh Ventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine
CN100412353C (zh) * 2006-08-02 2008-08-20 北京理工大学 一种高压共轨电控喷油器密封装置
US7866575B2 (en) * 2009-01-12 2011-01-11 GM Global Technology Operations LLC Pressure actuated fuel injector
TR201108147A2 (tr) * 2011-08-16 2013-01-21 Robert Bosch Gmbh Etkin sızdırmazlık özelliğine sahip bir enjeksiyon valfı.
US9856844B2 (en) * 2015-04-28 2018-01-02 MAGNETI MARELLI S.p.A. Fuel pump for a direct injection system with a better hydraulic sealing of the intake valve

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1232026B (it) * 1989-02-28 1992-01-23 Weber Srl Dispositivo di iniezione del combustibile ad azionamento elettromagne tico per motori a ciclo diesel
IT220661Z2 (it) * 1990-10-31 1993-10-08 Elasis Sistema Ricerca Fita Nel Mezzogiorno Soc.Consortile P.A. Perfezionamenti al sistema di tenuta ad alta pressione della valvola pilota di un iniettore elettromagnetico per sistemi di iniezione del combustibile di motori a combustione interna
IT1293434B1 (it) * 1997-07-11 1999-03-01 Elasis Sistema Ricerca Fiat Dispositivo di tenuta tra due vani soggetti a pressioni diverse, ad esempio in un inietttore di combustibile per motori a comustione
DE19802244A1 (de) * 1998-01-22 1999-07-29 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen

Also Published As

Publication number Publication date
JP4181419B2 (ja) 2008-11-12
US20040021011A1 (en) 2004-02-05
EP1395748A1 (fr) 2004-03-10
US6845756B2 (en) 2005-01-25
JP2004519620A (ja) 2004-07-02
WO2002095217A1 (fr) 2002-11-28

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