EP1340220B1 - Dispositif de rupture d'impedance acoustique d'une tige - Google Patents
Dispositif de rupture d'impedance acoustique d'une tige Download PDFInfo
- Publication number
- EP1340220B1 EP1340220B1 EP01982522A EP01982522A EP1340220B1 EP 1340220 B1 EP1340220 B1 EP 1340220B1 EP 01982522 A EP01982522 A EP 01982522A EP 01982522 A EP01982522 A EP 01982522A EP 1340220 B1 EP1340220 B1 EP 1340220B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rod
- mass
- nut
- housing
- element forming
- 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
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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
Definitions
- the present invention relates to a device acoustic impedance break in a given area a rod, by a bidirectional elastic connection with a mass, this connection being removable.
- the present invention relates more particularly a removable assembly architecture compact to achieve high impedance at the same time acoustic at the end of a rod, backlash by elastic return means and a filter mechanical low pass.
- Such a device can, for example, be used in an injection device such as that described in patent application FR 99-14548, filed by the Applicant.
- a injection device characterized in particular in that a rod or needle elastically deforms under the constraint of ultrasonic waves so as to define in sound end an annular ejection slot relative to a valve seat, said rod or needle cooperating in its other end with a mass and return means elastic housed in a cavity formed in the part rear of the injector housing.
- the rupture impedance at the end of the rod is ensured by adding a mass to the end of said rod, consisting of a single element, inside which is shaped a bore of diameter substantially identical to that of the needle, the said bore being intended to be at less partially crossed by the end of the needle supra.
- connection between the mass and the needle can be then assured in various ways, but we are still confronted in all cases with the delicate problem of not hindering assembly of the injection device while ensuring correct impedance break at the end of the needle, whatever the operating conditions.
- a second solution is to screw the end of the needle inside a thread formed in the rear mass, but the elastic bond thus created is not then not bidirectional since the deformation of the needle under the action of waves ultrasound can then cause detachment of the nets. The two parts are no longer in contact intimate, the impedance break is no longer correctly assured.
- the object of the present invention is therefore to resolve all of these problems by proposing a acoustic impedance break for a rod, having also a low-pass filter and catch-up function of play.
- the rupture device of acoustic impedance is thus composed of a new architecture, characterized in that the assembly mass removable and damping means is optimized to give the injection device aforementioned fuel better characteristics dynamics, in particular a better response time.
- a characteristic of the device thus formed is to have an architecture that is both compact, and generating an excellent impedance break acoustic, ensuring better wave reflection in the stem.
- the mass is composite, housed in a cavity formed in the part rear of the injector housing, consisting of a ballast constrained between two solid elements by an assembly screwed type nut lock nut, said solid elements having a suitable thread cooperating with the end threaded with a rod passing through said injector housing, said rod being held in abutment on a seat of valve integral with said injector housing to another end, said mass being elastically connected so bidirectional by elastic return means to the said injector housing.
- said composite mass has an acoustic impedance much higher than said rod.
- said rod cooperates with said mass via of a prestressed screw connection so that the maximum elastic deformation that can spread in said rod is less elastic deformation initial generated by the prestressed screw connection thus allowing bidirectional elastic continuity between said rod and said mass.
- the mass consists of tungsten whose integration is ensured by the mounting nut, against nut, between these two last the part in tungsten is imprisoned.
- the elastic return means are produced by washers elastic bands of which the material is an elastomer or a metallic and allow backlash.
- the elastic return means are shock absorbing.
- the first embodiment of the invention basically has two separate bodies cooperating with each other.
- the first organ is constituted by a rod cylindrical 3, formed in an elastic solid, housed axially movable inside said injector housing 5.
- the second organ is made up of a mass composite 20, axially movable, housed in a cavity 21 formed in the injector housing 5, capable of receiving fuel under pressure.
- the composite mass 20 is consisting of a tungsten ballast 8 constrained between two solid elements 7 and 9 of respective nut function and lock nut, said ballast 8 being guided axially by through a guide means 24 arranged on the nut element 7, having an acoustic impedance linear of the order of 12,000 to 16,000.
- the nut element 7 is locked in rotation by through cylindrical bars 2 and 4 whose ends are housed in cylindrical cavities formed on the one hand (15 and 14) in the nut 7, and on the other part (22 and 23) in the injector box 5, said bars 2,4 passing through a washer elastic 6 connecting said mass 20 to said body injector 5, at the bottom of the cavity 21.
- An elastic washer 10 is interposed between said mass. 20 and an adjusting member 11 linked to the housing injector 5, by means not shown, allowing thus an elastic connection between the mass 20 and the body of injector 5 in direction A.
- the rod 3 has at its upper end, in direction A a threaded portion 16 adapted for cooperate with a thread made on the nut element 7, as well as on the element against nut 9.
- the assembly of the assembly is carried out in the manner next. We first screw the rod 3 on the nut element 7 until a prestress is obtained desired allowing application of the opposite end of the rod 3 on the valve seat 25.
- the ballast 8 is then inserted on the guide 24.
- the lock nut element 9 is screwed onto the end of the rod 3, and traps the ballast 8. It includes maneuvering means such as holes 12 and 13.
- the game 19 ensures that the ballast 8 is well constrained between the element nut 7 and against nut 9.
- the screwing of the element against nut 9, the nut element 7 being locked in rotation by anti-rotation means (22,23,2,4,15 and 14), is done until an elastic deformation of the threads in the upper screw connection 16, at maximum deformation elastic of the wave propagating in the rod 3, said deformation wave generating an annular ejection slit relative to the valve seat 25.
- the elastic washer 10, associated with the element of setting 11, linked to the injector housing 5, for example by a screw nut assembly not shown, allows to obtain the preload necessary for sealing the valve seat 25, and is additionally required for make up for the clearances due in particular to stresses parts and wear.
- the material from which the washer is made elastic 10 can be based on polymers. It has, of preferably, a very high rate of attenuation of elastic deformations in dynamics.
- the elastic return means are produced by metal cups 30 and 31, instead of the washers 6 and 10 of the first embodiment. Holes 28 and 29 are made in these cups 30, 31 in order to allow the passage of fluid, and more precisely of fuel, thus producing a hydraulic damper, in particular during ultrasonic vibratory stresses coming from the mass 20 and transmitted to the cups 30 and 31.
- the screw against the nut 9 element must be screwed while the nut element 7 remains locked in rotation. In this embodiment, this blocking is achieved temporarily, during assembly, thus allowing the mass 20 and rod 3 assembly, in normal operation, to be free to rotate relative to the injector unit 5.
- the nut element 7 is temporarily blocked in rotation by means of a removable cylindrical bar not shown, the end of which is housed in the cylindrical cavities 15 and 22 formed respectively in the nut 7 and in the injector case 5 , said bar passing through the cup 6 connecting said mass 20 to said body 5, at the bottom of the cavity 21.
Description
- la figure 1 représente une vue d'ensemble, en coupe axiale, d'un premier mode de réalisation de la présente invention,
- la figure 2 représente une vue d'ensemble, en coupe axiale, d'un deuxième mode de réalisation de la présente invention.
Le vissage de l'élément contre écrou 9 doit se faire alors que l'élément écrou 7 reste bloqué en rotation. Dans ce mode de réalisation, ce blocage est réalisé de façon temporaire, lors du montage, permettant ainsi à l'ensemble masse 20 et tige 3, en fonctionnement normal, d'être libre en rotation par rapport au boítier d'injecteur 5.
L'élément écrou 7 est bloqué temporairement en rotation par l'intermédiaire d'un barreau cylindrique démontable non représenté dont l'extrémité est logée dans les cavités cylindriques 15 et 22 ménagées respectivement dans l'écrou 7 et dans le boítier d'injecteur 5, ledit barreau traversant la coupelle 6 reliant ladite masse 20 au dit corps 5, au fond de la cavité 21.
Claims (9)
- Dispositif de rupture d'impédance acoustique d'une tige (3) formée dans un solide élastique, et sur laquelle peut se propager une onde de déformation, notamment ultrasonore, comprenant une masse (20) reliée à ladite tige (3), caractérisé en ce que la masse (20) comporte un élément formant écrou (7) pouvant venir se visser sur une première zone filetée (16) de la tige (3), et un élément formant contre écrou (9) pouvant venir se visser sur une deuxième zone filetée (16) de la tige (3), ledit élément formant écrou (7) et ledit élément formant contre écrou (9) possédant une impédance acoustique très supérieure à l'impédance acoustique de ladite tige (3), le serrage de l'élément formant écrou (7) et de l'élément formant contre-écrou (9) étant effectué jusqu'à l'obtention d'une déformation d'au moins une partie des filets des première et/ou deuxième zones filetées (16) de la tige (3) supérieure au maximum de déformation de la tige (3) due à la propagation de l'onde dans la tige (3).
- Dispositif selon la revendication 1, caractérisé en ce que la masse (20) comprend, en outre, un lest (8), placé entre l'élément formant écrou (7) et l'élément contre écrou (9), et précontraint entre l'élément formant écrou (7) et l'élément formant contre écrou (9), la masse (20) possédant une impédance acoustique très supérieure à l'impédance acoustique de ladite tige (3).
- Dispositif selon les revendications 1 ou 2, caractérisé en ce que ladite masse (20) est placée à l'intérieur d'un boítier (5) et précontraint contre le boítier (5) un premier moyen de rappel élastique (6) selon une direction privilégiée selon un premier sens, et un second moyen de rappel élastique (10) selon la même direction privilégiée selon le sens opposé.
- Dispositif selon la revendication 3, caractérisé en ce que le boítier (5) comporte un siège de soupape (25) contre lequel peut venir en contact un élément complémentaire de la tige (26), la précontrainte des moyens de rappel élastique (6,10) par la masse (20) contre le boítier (5) assure un contact étanche entre le siège de soupape (25) et l'élément complémentaire (26) de la tige (3) en l'absence de propagation d'ondes sur celle-ci.
- Dispositif selon les revendications 3 ou 4, caractérisé en ce que lesdits moyens de rappel élastique (6,10) sont formés dans un matériau ayant un très fort taux d'atténuation de déformations élastiques en dynamique.
- Dispositif selon les revendications 3 ou 4, caractérisé en ce que le boítier (5) est alimenté en fluide sous pression, lesdits moyens de rappel élastique (6,10) présentant des trous (28,29), et constituant, par passage forcé du fluide par lesdits trous (28,29), un amortisseur hydraulique.
- Dispositif selon l'une des revendications 2 à 6, caractérisé en ce que le lest (8) est formé de tungstène.
- Dispositif selon l'une des revendications 1 à 7, caractérisé en ce que l'ensemble masse (20) et tige (3) est libre en rotation par rapport au boítier (5).
- Dispositif selon l'une des revendications 1 à 7, caractérisé en ce que l'ensemble masse (20) et tige (3) est bloquée en rotation par rapport au boítier (5), par l'intermédiaire de barreaux (2,4) traversant au moins en partie le boítier (5) et la masse (20).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0013819A FR2816097B1 (fr) | 2000-10-27 | 2000-10-27 | Dispositif de rupture d'impedance acoustique d'une tige |
FR0013819 | 2000-10-27 | ||
PCT/FR2001/003245 WO2002035515A1 (fr) | 2000-10-27 | 2001-10-19 | Dispositif de rupture d'impedance acoustique d'une tige |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1340220A1 EP1340220A1 (fr) | 2003-09-03 |
EP1340220B1 true EP1340220B1 (fr) | 2004-12-08 |
Family
ID=8855817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01982522A Expired - Lifetime EP1340220B1 (fr) | 2000-10-27 | 2001-10-19 | Dispositif de rupture d'impedance acoustique d'une tige |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1340220B1 (fr) |
DE (1) | DE60107717T2 (fr) |
ES (1) | ES2228962T3 (fr) |
FR (1) | FR2816097B1 (fr) |
WO (1) | WO2002035515A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2831613B1 (fr) * | 2001-10-25 | 2004-01-23 | Renault | Dispositif de fixation d'un moyen de rupture d'impedance acoustique sur une tige d'un dispositif d'injection de carburant |
FR2857418B1 (fr) * | 2003-07-10 | 2007-04-06 | Renault Sa | Dispositif d'application de precontrainte a une soupape d'un injecteur de carburant et moyens de rupture d'impedance acoustique de l'injecteur |
FR2874665B1 (fr) * | 2004-09-01 | 2008-12-19 | Renault Sas | Dispositif d'absorption des basses frequences dans un injecteur |
FR2904666B1 (fr) * | 2006-08-02 | 2011-03-04 | Renault Sas | Dispositif d'injection de carburant a ondes acoustiques comportant des moyens de rupture d'impedance acoustique de la tige d'ejection. |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3778758A (en) * | 1972-09-25 | 1973-12-11 | Us Navy | Transducer |
JPS6318800A (ja) * | 1986-07-09 | 1988-01-26 | Nec Corp | 水中超音波トランスジユ−サ |
GB2311427B (en) * | 1996-03-22 | 2000-02-09 | Marconi Gec Ltd | A drill string sub assembly |
-
2000
- 2000-10-27 FR FR0013819A patent/FR2816097B1/fr not_active Expired - Fee Related
-
2001
- 2001-10-19 WO PCT/FR2001/003245 patent/WO2002035515A1/fr active IP Right Grant
- 2001-10-19 ES ES01982522T patent/ES2228962T3/es not_active Expired - Lifetime
- 2001-10-19 EP EP01982522A patent/EP1340220B1/fr not_active Expired - Lifetime
- 2001-10-19 DE DE60107717T patent/DE60107717T2/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
FR2816097B1 (fr) | 2003-02-07 |
WO2002035515A1 (fr) | 2002-05-02 |
EP1340220A1 (fr) | 2003-09-03 |
ES2228962T3 (es) | 2005-04-16 |
DE60107717D1 (de) | 2005-01-13 |
DE60107717T2 (de) | 2005-05-19 |
FR2816097A1 (fr) | 2002-05-03 |
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