EP2470772B1 - Montagesystem für eine resonaznadelinjektionsvorrichtung - Google Patents

Montagesystem für eine resonaznadelinjektionsvorrichtung Download PDF

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Publication number
EP2470772B1
EP2470772B1 EP10745289.8A EP10745289A EP2470772B1 EP 2470772 B1 EP2470772 B1 EP 2470772B1 EP 10745289 A EP10745289 A EP 10745289A EP 2470772 B1 EP2470772 B1 EP 2470772B1
Authority
EP
European Patent Office
Prior art keywords
tubular body
spacer piece
spacer
needle
nose
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
EP10745289.8A
Other languages
English (en)
French (fr)
Other versions
EP2470772A1 (de
Inventor
André AGNERAY
Nadim Malek
Laurent Levin
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.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Publication of EP2470772A1 publication Critical patent/EP2470772A1/de
Application granted granted Critical
Publication of EP2470772B1 publication Critical patent/EP2470772B1/de
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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/041—Injectors peculiar thereto having vibrating means for atomizing the fuel, e.g. with sonic or ultrasonic vibrations
    • 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
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors

Definitions

  • the invention relates to a mounting system for a resonant needle liquid injection device intended in particular for a heat engine.
  • the document FR 2 918 123 describes a mounting system of a fuel injection device according to the preamble of claim 1. It is also known from the document FR 2,889,257 an injection device whose opening is obtained by resonating a needle.
  • a device comprises a tubular body, an injector nose extending the tubular body.
  • a needle is lodged in the nose extending longitudinally in the form of a bar.
  • One end of the needle has a valve head on a seat carried by the nose.
  • the device also comprises an actuator capable of causing movement of the head to open the valve by axially resonating the needle with axial pulses at a determined nominal frequency.
  • the nominal frequency is typically between 15 and 30 kHz, but may be higher.
  • the head of the needle is supported on the seat before moving away from it leaving an opening for the fuel between them.
  • the nose is thus subjected to axial impulses which also tend to put it in resonance.
  • the resonance of the nose favors that of the needle by increasing the amplitude of the opening of the injection device.
  • the invention therefore aims to provide a mounting system of a resonant needle device on a cylinder head to promote the effectiveness of the device.
  • the invention relates to a mounting system of a fuel injection device on an engine cylinder head, the device comprising a tubular body, an injector nose extending the tubular body, a needle extending coaxially to the nose in the form of a bar and one end of which has a valve head on a seat carried by the injector nose, an actuator being able to cause movement of the head to open the valve, needle being adapted to enter into axial resonance when it is subjected by the actuator to axial pulses at a nominal frequency determined, the system comprising the injection device, characterized in that it comprises a spacer intended to bear on one hand on a face of the cylinder head, and bearing on the other hand on a front face of the tubular body at the connection with the nose.
  • the use of a spacer makes it possible to adjust the position of the nose of the device relative to the combustion chamber while being free to choose the length of the nose, whatever the thickness of the wall of the cylinder head. It is therefore possible to respect the positional constraints of the injection device while maintaining the optimum efficiency of the device by the choice of the length of the nose.
  • the spacer has for example the shape of a ring surrounding the base of the nose.
  • the system further comprises a flange for attachment to the yoke and pressing the tubular body on the spacer by pressing on a clamping shoulder.
  • the device is thus permanently held in place on the spacer by the flange.
  • the spacer and the portion of the tubular body between the clamping shoulder and the front face have lengths such that the propagation time of an acoustic wave in the portion of the tubular body between the shoulder Clamping and the front face, added to the propagation time in the spacer is a multiple of half a period of the nominal frequency.
  • the spacer comprises at least one inner groove and at least one outer groove. It is found that with such a spacer, the propagation time of a wave is increased for the same geometric length, compared to a spacer without a groove. In another way, we obtain the same propagation time with a reduced geometric length. It is thus possible to modify the geometrical length of the spacer while maintaining a determined propagation time. It is for example possible to determine a position of the nose in the combustion chamber while respecting the characteristics of propagation time, and whatever the thickness of the cylinder wall.
  • the grooves of the spacer are distributed axially alternately inside and outside.
  • some kinds of baffles, seen in longitudinal section of the spacer are drawn. We see that such a provision allows the propagation time to be varied very considerably, for example up to twice the propagation time of a wave in a spacer without grooves.
  • the nominal frequency is for example in a range extending from 10 to 30 kHz.
  • a first embodiment of the liquid injection device 1 according to the invention is shown on the figure 1 . It comprises a tubular body 11 extending along a longitudinal axis A and extended by a nose 13.
  • the nose 13 has a tubular shape of constant section and in which a needle 12 is slidably mounted.
  • the needle 12 has at one end a head 120 forming a valve on a seat 130 of the nose 13.
  • a feed conduit 111 for channeling the liquid such as fuel extends into the device 1 from an inlet 112 and around the needle 12 to the flapper.
  • the device 1 comprises a spring 14 which maintains the head 120 of the needle 12 against the seat 130 so as to close the valve and normally prevent liquid from escaping.
  • the device 1 further comprises an actuator 10 piezoelectric material capable of causing a displacement of the head 120 of the needle 12 to open the valve.
  • the actuator 10 forms with the needle 12 a movable assembly slidably mounted in the tubular body 11.
  • the device 1 is mounted on a cylinder head 2 defining a combustion chamber C.
  • the wall of the cylinder head 2 is pierced by a through hole 20 in which the nose 13 of the device is introduced.
  • the device is placed so that the nose 13 protrudes into the combustion chamber C of one or two millimeters, for example.
  • the yoke 2 has a yoke face 21 around the outlet of the through hole 20 opposite the combustion chamber C.
  • a spacer 3 of tubular shape is interposed between a front face 113 of the tubular body 11 and the breech face 2 and bears on these two faces 21, 113.
  • the tubular body 11 has on its outer surface a clamping shoulder 114.
  • a flange 4 is supported on the one hand on said clamping shoulder 114 and on a boss 22 of the yoke 2.
  • a screw 5 plates the flange 4 on these two supports 22, 114.
  • the needle 12 When it is desired to perform a fuel injection, it is pressurized, in particular in the space between the nose 13 and the needle 12.
  • the spring 14 holds the head 120 in position. pressing on the seat 130 and closes the valve.
  • the piezoelectric actuator 10 is supplied with a current at the nominal frequency, for example 30 kHz, which causes the transmission of compression or relaxation waves in the axial direction.
  • the needle 12 receives these pulses in the axial direction and is resonated by elongating and retracting.
  • the needle 12 elongates, the head 120 leaves its support on the seat 130 and passes fuel which is thus injected into the combustion chamber C.
  • the needle 12 retracts, the head 120 bears on the seat 130.
  • Successive docking of the head 120 on the seat 130 generates waves also transmitted to the nose 13 in the axial direction.
  • the length of the nose 13 is chosen in principle so that the propagation time of an acoustic wave in the nose is a multiple of a half-period of the nominal frequency, so that during the resonance, the base nose 13 at the front face 113 is a displacement node. However oscillations can still occur at the front face 113. These oscillations are then transmitted in the portion of the tubular body 11 between the front face 113 and the clamping shoulder 114 and in the spacer 3.
  • the spacer 3 ' has three circular outer grooves 31 formed on the outer cylindrical surface 30 of the spacer 3'. It also comprises three circular inner grooves 32 made on the cylindrical surface Inside 33. Viewed in a longitudinal section of the wall of the spacer 3 ', the outer grooves 31 and the inner grooves 32 are staggered. The depth of the grooves 31, 32 exceeds half the thickness of the wall of the spacer 3 '. It can be seen that the propagation time of an acoustic wave between the end faces of such a spacer 3 'is practically twice that for a similar spacer of the same geometric length but without grooves.

Landscapes

  • 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. System zur Montage einer Kraftstoffeinspritzvorrichtung auf einen Motor-Zylinderkopf (2), wobei die Vorrichtung einen rohrförmigen Körper (11), ein Einspritzdüsen-Mundstück (13), das den rohrförmigen Körper (11) verlängert, eine Nadel (12), die sich koaxial zum Mundstück (13) in Form einer Stange erstreckt und von der ein Ende einen Kopf (120) trägt, der eine Klappe auf einem Sitz (130) bildet, der vom Einspritzdüsen-Mundstück (13) getragen wird, ein Stellglied (10), das eine Verschiebung des Kopfs (120) bewirken kann, um die Klappe zu öffnen, aufweist, wobei die Nadel (12) in axiale Resonanz treten kann, wenn sie vom Stellglied (10) axialen Impulsen mit einer bestimmten Nennfrequenz ausgesetzt wird, wobei das System die Einspritzvorrichtung aufweist, dadurch gekennzeichnet, dass es einen Abstandshalter (3) aufweist, der dazu bestimmt ist, einerseits auf einer Zylinderkopfseite (21) aufzuliegen, und andererseits auf einer Vorderseite (113) des rohrförmigen Körpers (11) im Bereich der Verbindung mit dem Mundstück (13) aufliegt.
  2. Montagesystem nach Anspruch 1, dadurch gekennzeichnet, dass es außerdem einen Flansch (4) aufweist, der dazu bestimmt ist, am Zylinderkopf (2) befestigt zu werden, und den rohrförmigen Körper (11) durch einen Druck auf eine Einspannschulter (114) auf den Abstandshalter (3) presst.
  3. System nach Anspruch 2, wobei der Abstandshalter (3) und der Abschnitt des rohrförmigen Körpers (11), der zwischen der Einspannschulter und der Vorderseite liegt, solche Längen haben, dass die Ausbreitungszeit einer akustischen Welle im Abschnitt des rohrförmigen Körpers zwischen der Einspannschulter (114) und der Vorderseite (113), hinzugefügt zur Ausbreitungszeit im Abstandshalter, ein Vielfaches einer Halbperiode der Nennfrequenz ist.
  4. System nach Anspruch 2, wobei der Abstandshalter (3') mindestens eine innere Nut (32) und mindestens eine äußere Nut (31) aufweist.
  5. System nach Anspruch 4, wobei die Nuten (31, 32) des Abstandshalters (3') axial abwechselnd innen und außen verteilt sind.
  6. System nach Anspruch 1, wobei die Nennfrequenz sich in einem Bereich befindet, der von 10 bis 30 kHz geht.
EP10745289.8A 2009-08-24 2010-06-22 Montagesystem für eine resonaznadelinjektionsvorrichtung Not-in-force EP2470772B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0955759A FR2949247B1 (fr) 2009-08-24 2009-08-24 Systeme de montage d'un dispositif d'injection a aiguille resonnante.
PCT/FR2010/051263 WO2011023867A1 (fr) 2009-08-24 2010-06-22 Système de montage d'un dispositif d' injection à aiguille résonnante

Publications (2)

Publication Number Publication Date
EP2470772A1 EP2470772A1 (de) 2012-07-04
EP2470772B1 true EP2470772B1 (de) 2017-03-29

Family

ID=41719271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10745289.8A Not-in-force EP2470772B1 (de) 2009-08-24 2010-06-22 Montagesystem für eine resonaznadelinjektionsvorrichtung

Country Status (5)

Country Link
US (1) US9038602B2 (de)
EP (1) EP2470772B1 (de)
CN (1) CN102575628B (de)
FR (1) FR2949247B1 (de)
WO (1) WO2011023867A1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080000452A1 (en) * 2006-06-01 2008-01-03 Roberto Ricci Compensation Device And Cylinder Head Arrangement

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2829057A1 (de) * 1978-07-01 1980-01-10 Bosch Gmbh Robert Kraftstoffeinspritzanlage
DE19941930A1 (de) * 1999-09-03 2001-03-15 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19962968A1 (de) * 1999-12-24 2001-06-28 Bosch Gmbh Robert Ausgleichselement
DE10126336A1 (de) * 2001-05-30 2002-12-12 Siemens Ag Zylinderkopf und daran montierter Injektor
FR2832189B1 (fr) * 2001-11-09 2004-12-03 Renault Dispositif de fixation d'un systeme d'injection de carburant pour moteur a combustion interne
FR2889257B1 (fr) * 2005-08-01 2007-11-02 Renault Sas Dispositif d'injection de carburant et procede de commande d'un tel dispositif
DE602006003999D1 (de) 2006-03-23 2009-01-15 Delphi Tech Inc Befestigungsanordnung für einen Injektor
KR100862418B1 (ko) * 2006-12-15 2008-10-08 현대자동차주식회사 자동차용 인젝터 클램프
FR2918123A1 (fr) * 2007-06-27 2009-01-02 Renault Sas Dispositif d'injection de fluide.
DE102008032385B4 (de) * 2008-07-09 2018-03-29 Audi Ag Hochdruckeinspritzanordnung für eine direkteinspritzende Brennkraftmaschine
CN102282358B (zh) * 2009-01-16 2015-12-02 伊利诺斯工具制品有限公司 用于燃油喷射系统的双相弹簧组件
US20110265767A1 (en) * 2010-05-03 2011-11-03 Delphi Technologies, Inc. Isolater for fuel injector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080000452A1 (en) * 2006-06-01 2008-01-03 Roberto Ricci Compensation Device And Cylinder Head Arrangement

Also Published As

Publication number Publication date
EP2470772A1 (de) 2012-07-04
CN102575628B (zh) 2014-07-02
US9038602B2 (en) 2015-05-26
CN102575628A (zh) 2012-07-11
FR2949247A1 (fr) 2011-02-25
WO2011023867A1 (fr) 2011-03-03
FR2949247B1 (fr) 2011-09-16
US20120204838A1 (en) 2012-08-16

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