EP1900932B1 - Injecteur destiné à la vaporisation de carburant - Google Patents

Injecteur destiné à la vaporisation de carburant Download PDF

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Publication number
EP1900932B1
EP1900932B1 EP07112398A EP07112398A EP1900932B1 EP 1900932 B1 EP1900932 B1 EP 1900932B1 EP 07112398 A EP07112398 A EP 07112398A EP 07112398 A EP07112398 A EP 07112398A EP 1900932 B1 EP1900932 B1 EP 1900932B1
Authority
EP
European Patent Office
Prior art keywords
actuator
actuator head
coupler piston
adjusting disc
projection
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.)
Not-in-force
Application number
EP07112398A
Other languages
German (de)
English (en)
Other versions
EP1900932A3 (fr
EP1900932A2 (fr
Inventor
Stefan Schuerg
Jochen Winkler
Norbert Eichelsdoerfer
Ingo Bleich
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 EP1900932A2 publication Critical patent/EP1900932A2/fr
Publication of EP1900932A3 publication Critical patent/EP1900932A3/fr
Application granted granted Critical
Publication of EP1900932B1 publication Critical patent/EP1900932B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • 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
    • F02M2200/8015—Provisions for assembly of fuel injection apparatus in a certain orientation, e.g. markings, notches or specially shaped sleeves other than a clip

Definitions

  • the invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine according to the preamble of claim 1.
  • fuel injectors are used. These generally include an actuator operated control valve. Magnetic actuators or piezoactuators are usually used as actuators. Due to the very small strokes, even slight deviations in the dimensions of the individual components of the injector lead to malfunction.
  • a coupler piston between the piezoelectric actuator and the control valve is connected.
  • the coupler piston translates the stroke of the actuator.
  • Such translator units are for example off WO 2004/027252
  • a control valve which comprises a mechanical translation device in order to transmit the force generated by the piezoelectric element to the valve needle.
  • the piezoelectric actuator transmits over the end face a force on the lever, wherein a pressure piece is located between the levers and the actuator head, which has a recess for receiving the actuator head.
  • EP 1 865 189 a fuel injector is described which provides a switching valve for opening and closing the injection openings by means of an injection member.
  • This switching valve comprises an actuator which actuates a valve piston.
  • a disc-shaped insert part with pins formed on it transmits the Aktorhub on the valve piston, which switches between the valve seats.
  • a shim is received between the piezoelectric actuator and the coupler piston.
  • the thickness of the shim is chosen so that the length tolerances are compensated.
  • a bore in two different diameters is performed in the shim. On the side with a smaller diameter, the bore is followed by a dome-shaped enlargement.
  • an extension on the actuator head of the piezoelectric actuator is located on the dome-shaped extension.
  • An extension formed on the coupler piston is received in the larger diameter bore.
  • the shim is located on an extension on the coupler piston.
  • the extension on the coupler piston abuts the dome-shaped enlargement since it can not be received by the smaller diameter bore.
  • the extension is also located on the actuator head of the piezoelectric actuator on the dial. The shim is thus not on the coupler piston and the distance between the coupler piston and the actuator head is greater than a predetermined amount. This indicates that the dial has been installed the wrong way round.
  • the shim is punched out first, sanded smooth in a next step by vibratory grinding, in the ground disc, the bore and the dome-shaped depression are lowered, which forms a Crugewulst on one side of the disc. Subsequently, the shim is hardened and abraded the Crugewulst. The classification of the shim is done by finish grinding and subsequent finishing grinding for smoothing. Finally, the shim is tested and classified. Since the dome-shaped recess can be damaged during slide grinding, a visual inspection of each individual dial is required.
  • an injection valve member for releasing or closing at least one injection port is actuated by an actuator-operated control valve.
  • the actuator comprises an actuator head which acts on a coupler piston.
  • a shim is arranged between the actuator head and the coupler piston, wherein an extension is formed on the actuator head, which is received in a recess of the shim.
  • a bead is formed such that the distance between the actuator head and the coupler piston deviates from a predetermined amount in an incorrect positioning of the shim.
  • the shim In order to avoid that the shim can slip on the coupler piston during assembly, the shim is penetrated by a bore, wherein an extension of the coupler piston is received in the bore.
  • the bore preferably opens into the recess on the dial, in which the extension is received on the actuator head.
  • the shim used according to the invention can be produced with less complexity than the shim according to the prior art.
  • the required bead arises when lowering the recess.
  • Another advantage is that a visual inspection is no longer necessary, since damage in the region of the depression can no longer occur.
  • the punching of the dial can be done with a solid stamp.
  • the bead is preferably formed so that it encloses the recess in the shim. With proper installation of the shim then wraps surround the fort set on the actuator head. Incorrect installation of the shim causes the bead to rest on the coupler piston. This results in that the distance between the coupler piston and the extension on the actuator is greater than a predetermined amount. From this it can be seen that a wrong assembly has taken place.
  • the diameter of the extension on the coupler piston is preferably smaller than that Diameter of the extension on the actuator head.
  • the diameter of the bore can be made smaller than the diameter of the extension on the actuator head.
  • a plate-shaped extension is generally formed, on which the shim rests. If the shim is correctly mounted, the shim with its flat face is located on the extension on the coupler piston. If the shim is mounted incorrectly, the bead rests on the plate-shaped enlargement and causes the actual dimension of the distance between the actuator head and the coupler piston to deviate from a predetermined setpoint. This can be the wrong installation of the dial recognize.
  • the recess in the shim, in which the extension is received on the actuator head is preferably formed dome-shaped.
  • the extension on the actuator head preferably ends with a spherical layer, so that the spherical layer rests flush in the dome-shaped depression. Through the dome-shaped depression a gimbal suspension of the actuator head in the dial is possible.
  • the bead is made by embossing the recess in the dial.
  • embossing of the depression and the consequent emergence of the bead it is also possible to produce the depression, for example, by a machining process.
  • the bead can be produced, for example, by a cutting process on the end face of the shim. It is also possible to produce the bead by material application, for example by welding.
  • FIG. 1 a fuel injector is shown with a dial.
  • An injector 1 comprises a control valve 3, which is confirmed via an actuator 5.
  • the actuator 5 is a piezoelectric actuator.
  • the actuator 5 is connected to an actuator head 7, which acts on a coupler piston 9.
  • a booster piston 15 defines the booster chamber 13 the translator piston 15, the stroke of the actuator 5 is hydraulically translated.
  • the translation of the stroke is dependent on the diameter of the coupler piston 9 and the diameter of the booster piston 15.
  • a piezoelectric actuator as the actuator 5 so a smaller piezoelectric actuator can be used.
  • an injection valve member 19 is driven.
  • the injection valve member 19 is at least an injection port 21 free or closes this.
  • the injection valve member 19 in a seat 23 in a lower housing part 25 can be adjusted.
  • the injection valve member 19 opens with an end face 27 in a control chamber 29.
  • the control chamber 29 is further limited by a ring member 31 and an intermediate disc 33.
  • a biting edge 35 is formed, which is placed against the washer 33.
  • the required force is applied by a spring element 37 which acts on the ring element 31.
  • the spring element 37 acts on a shoulder 39 on the injection valve member 19.
  • the required spring force is set by an adjusting ring 41.
  • the spring force of the spring element 37 is dependent on the height of the adjusting ring 41.
  • the spring element 37 is e.g. a trained as a spiral spring compression spring.
  • a valve disc 43 connects.
  • a valve seat 45 of the control valve 3 is formed.
  • an upper housing part 47 connects.
  • the our housing part 25, the intermediate disc 33, the valve disc 43 and the upper housing part 47 are connected by a nozzle lock nut 49 with each other.
  • the actuator space 51 is e.g. designed as a blind hole in the upper housing 47.
  • the actuator 5 is received in the actuator chamber 51 between an actuator base 53 and the actuator head 7.
  • the actuator 5 is enclosed by a sleeve 55.
  • a stable attachment of the actuator 5 in the sleeve 55 is achieved in that the actuator is cast using potting compound 57 in the sleeve. So that no fuel can penetrate into the sleeve 55, the sleeve in the region of the actuator head 7 is closed by a diaphragm 59.
  • the actuator base 53, the actuator 5 and the actuator head 7 comprising, shown, is between the actuator head 7 and the coupler piston 9, a shim 61 added.
  • FIG. 2 shows an enlarged view of actuator head, coupler piston and shim with correct installation of the shim.
  • an extension 71 is formed, which is placed in a recess 73 in the dial 61.
  • the recess 73 is formed dome-shaped.
  • the extension 71 runs in the form of a spherical layer 75, so that the extension 71 rests flush on the dome-shaped recess 73.
  • an extension 77 is formed, which is received in a bore 79 which is formed in the dial 61.
  • the diameter of the bore 79 is preferably selected so that the dial 61 can be set without play on the extension 7 on the coupler piston 9.
  • the dial 61 When properly mounted, the dial 61 rests with a flat ground end face 81 on an extension 83 on the coupler piston 9.
  • a bead 85 is formed on the adjusting disk 61.
  • the bead 85 encloses the recess 73 in the dial 61 and thus, when properly mounted, also the projection 71 on the actuator head 7.
  • the bead 85 is formed e.g. by lowering the recess 73 in the dial 61st
  • a predetermined desired distance s between an upper end face 87 of the extension 83 on the coupler piston 9, on which the shim 61 rests, and a shoulder 89 on the actuator head 7 is set.
  • the setting of the nominal distance s takes place via the height h of the adjusting disk 61.
  • FIG. 3 is an actuator head, a coupler piston and a dial shown in case of incorrect installation of the shim.
  • the bead 85 formed on the adjusting disk 61 rests on the upper end face 87 of the extension 83 on the coupler piston 9.
  • the extension 77 on the coupler piston 9 protrudes through the recess 73 into the bore 79, which is formed in the dial 61.
  • the diameter of the extension 77 on the coupler piston is smaller than the diameter of the extension 71 on the actuator head 7 and the diameter of the Borhung 79 is therefore smaller than the diameter of the extension 71 on the actuator head 7, the extension 71 is not inserted into the bore 79 become. In case of incorrect installation of the dial 61 of the extension 71 is thus on the dial 61.
  • a chamfer 91 is formed on the bore 79 in the dial 61 on the recess 73 opposite side. Depending on the diameter of the extension 71, it is possible for the extension 71 to rest on the actuator head 7 with the ball layer 75 on the chamfer 91 if it is mounted incorrectly.
  • the bead 85 rests on the extension 83 on the coupler piston 9 and the extension 71 on the actuator head 7 can not be inserted into the bore 79, the distance between the upper end surface 87 on the extension 83 of the coupler piston 9 and the shoulder 89 on the actuator head 7 is greater than the desired distance s.
  • the distance between the shoulder 89 on the actuator head 7 and the upper end face 87 of the extension 83 on the coupler piston 9 reaches a value of s + x.
  • x means the difference between the actual distance between the shoulder 89 and the upper end face 87 and the desired distance s.

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)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (7)

  1. Injecteur pour l'injection de carburant dans une chambre de combustion d'un moteur à combustion interne, dans lequel un organe de soupape d'injection (19) est commandé pour libérer ou fermer au moins une ouverture d'injection (21) par une soupape de commande (3) actionnée par un actionneur, l'actionneur (5) comprenant une tête d'actionneur (7) qui agit sur un piston de coupleur (9), et une rondelle d'ajustement (61) est disposée entre la tête d'actionneur (7) et le piston de coupleur (9) pour compenser les tolérances longitudinales, une saillie (71) étant réalisée sur la tête d'actionneur (7), laquelle est reçue dans un renfoncement (73) de la rondelle d'ajustement (61), un bourrelet (85) étant réalisé sur la rondelle d'ajustement (61) de telle sorte que, dans le cas d'un mauvais positionnement de la rondelle d'ajustement (61), la distance entre la tête d'actionneur (7) et le piston de coupleur (9) s'écarte d'une mesure prédéfinie, caractérisé en ce que la rondelle d'ajustement (61) est traversée par un alésage (79), une saillie (77) du piston de coupleur (9) étant reçue dans l'alésage (79) et l'alésage (79) débouchant dans le renfoncement (73) de la rondelle d'ajustement (61) dans lequel la saillie (71) est reçue sur la tête d'actionneur (7).
  2. Injecteur selon la revendication 1, caractérisé en ce que le bourrelet (85) entoure le renfoncement (73) de la rondelle d'ajustement (61).
  3. Injecteur selon la revendication 1 ou 2, caractérisé en ce que, dans le cas d'un montage correct de la rondelle d'ajustement (61) entre la tête d'actionneur (7) et le piston de coupleur (9), le bourrelet (85) entoure la saillie (71) sur la tête d'actionneur (7).
  4. Injecteur selon les revendications 1 à 3, caractérisé en ce que le diamètre de la saillie (77) sur le piston de coupleur (9) est inférieur au diamètre de la saillie (71) sur la tête d'actionneur (7).
  5. Injecteur selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'un élargissement en forme de coupelle (83) est réalisé sur le piston de coupleur (9), élargissement sur lequel repose la rondelle d'ajustement (61).
  6. Injecteur selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le renfoncement (73) de la rondelle d'ajustement (61), dans lequel est reçue la saillie (71) sur la tête d'actionneur (7), est réalisé en forme de calotte et la saillie (71) sur la tête d'actionneur (7) se termine avec une couche sphérique (75), la couche sphérique (75) s'appliquant en affleurement contre le renfoncement (73) en forme de calotte.
  7. Injecteur selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le bourrelet (85) est fabriqué par matriçage du renfoncement (73) de la rondelle d'ajustement (61).
EP07112398A 2006-09-11 2007-07-13 Injecteur destiné à la vaporisation de carburant Not-in-force EP1900932B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006042601A DE102006042601A1 (de) 2006-09-11 2006-09-11 Injektor zum Einspritzen von Kraftstoff

Publications (3)

Publication Number Publication Date
EP1900932A2 EP1900932A2 (fr) 2008-03-19
EP1900932A3 EP1900932A3 (fr) 2009-11-18
EP1900932B1 true EP1900932B1 (fr) 2011-03-30

Family

ID=38740193

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07112398A Not-in-force EP1900932B1 (fr) 2006-09-11 2007-07-13 Injecteur destiné à la vaporisation de carburant

Country Status (3)

Country Link
EP (1) EP1900932B1 (fr)
AT (1) ATE503924T1 (fr)
DE (2) DE102006042601A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000875A1 (de) 2009-02-16 2010-08-19 Robert Bosch Gmbh Kraftstoffinjektor
DE102009001322A1 (de) 2009-03-04 2010-09-09 Robert Bosch Gmbh Kraftstoffinjektor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5779149A (en) * 1996-07-02 1998-07-14 Siemens Automotive Corporation Piezoelectric controlled common rail injector with hydraulic amplification of piezoelectric stroke
DE10242376A1 (de) 2002-09-12 2004-03-25 Siemens Ag Pumpe-Düse-Einheit und Verfahren zur Einstellung der Härte von Anlagebereichen eines Steuerventils
DE102005028135A1 (de) * 2005-06-17 2006-12-28 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102006026381A1 (de) 2006-06-07 2007-12-13 Robert Bosch Gmbh Kraftstoffinjektor mit Druckübersetzer und niederdruckseitig angeordnetem Piezosteller
DE102006031567A1 (de) * 2006-07-07 2008-01-10 Siemens Ag Einspritzsystem und Verfahren zum Herstellen eines Einspritzsystems

Also Published As

Publication number Publication date
EP1900932A3 (fr) 2009-11-18
ATE503924T1 (de) 2011-04-15
DE102006042601A1 (de) 2008-03-27
EP1900932A2 (fr) 2008-03-19
DE502007006826D1 (de) 2011-05-12

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