EP1340220A1 - Dispositif de rupture d'impedance acoustique d'une tige - Google Patents
Dispositif de rupture d'impedance acoustique d'une tigeInfo
- Publication number
- EP1340220A1 EP1340220A1 EP01982522A EP01982522A EP1340220A1 EP 1340220 A1 EP1340220 A1 EP 1340220A1 EP 01982522 A EP01982522 A EP 01982522A EP 01982522 A EP01982522 A EP 01982522A EP 1340220 A1 EP1340220 A1 EP 1340220A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rod
- mass
- housing
- acoustic impedance
- nut
- 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.)
- Granted
Links
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 for breaking acoustic impedance in a given area of a rod, by a bidirectional elastic connection with a mass, this connection being removable.
- the present invention relates more particularly to a compact dismountable assembly architecture to achieve at the same time a high acoustic impedance at the end of a rod, the backlash by means of elastic return and, a mechanical low pass filter.
- 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.
- an injection device characterized in particular in that a rod or needle deforms elastically under the stress of ultrasonic waves so as to define at its end an annular slot for ejection relative to to a valve seat, said rod or needle cooperating at its other end with a mass and elastic return means housed in a cavity formed in the rear part of the injector housing.
- the impedance breaking at the end of the rod is ensured by the addition at the end of the said rod of a mass, 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 at least partially crossed by the end of the aforementioned needle.
- connection between the mass and the needle can then be ensured in various ways, but in all cases there remains the delicate problem of not interfering with the assembly of the injection device while ensuring a correct impedance break at the end of the needle, whatever the operating conditions.
- a second solution consists in screwing the end of the needle inside a thread formed in the rear mass, but the elastic connection thus created is then not bidirectional insofar as the deformations of the needle under the action of ultrasonic waves can then cause detachment of the threads. As the two parts are no longer in intimate contact, the break in impedance is no longer correctly ensured.
- the object of the present invention is therefore to solve all of these problems by proposing a device for breaking an acoustic impedance for a rod, also having a function of low-pass filter and of catching up with water.
- the acoustic impedance breaking device is thus composed of a new architecture, characterized in that the dismountable assembly of mass and damping means is optimized so as to give the injection device said fuel has better dynamic characteristics, in particular better response time.
- a characteristic of the device thus formed is to have an architecture that is both compact and that generates an excellent break in acoustic impedance, guaranteeing better wave reflection in the rod.
- the mass is composite, housed in a ' cavity formed in the rear part of the injector housing, consisting of a ballast forced between two solid elements by a screwed assembly of nut-against-nut type, said solid elements comprising a suitable thread cooperating with the threaded end of a rod passing through said injector housing, said rod being held in abutment on a valve seat integral with said injector housing at its other end, said mass being elastically connected bidirectionally by elastic return means to said injector housing.
- said composite mass has an acoustic impedance much greater than said rod.
- said rod cooperates with said mass by means of a pre-stressed screw connection so that the maximum elastic deformation which can propagate in said rod is less than the initial elastic deformation generated by the assembly screwed prestressed thus allowing bidirectional elastic continuity between said rod and said mass.
- the mass consists of tungsten, the integration of which is ensured by mounting the nut, against the nut, between the latter two, the tungsten part is trapped.
- the elastic return means are produced by elastic washers of which the material is an elastomer or a metal and allow the play to be taken up.
- the elastic return means are damping.
- FIG. 1 represents an overall view, in axial section, of a first embodiment of the present invention
- Figure 2 shows an overview, in axial section, of a second embodiment of the present invention.
- the first embodiment of the invention shown in Figure 1, essentially comprises two separate members cooperating with each other.
- the first member is constituted by a cylindrical rod 3, formed in an elastic solid, housed movable axially inside said injector housing 5.
- the second member is constituted by a composite mass 20, axially movable, housed in a cavity 21 formed in the injector housing 5, capable of receiving fuel under pressure.
- the composite mass 20 consists of a tungsten ballast 8 constrained between two solid elements 7 and 9 of respective nut and lock nut function, said ballast 8 being guided axially by means of a guide means 24 arranged on the nut element 7, having a linear acoustic impedance of the order of 12,000 to 16,000.
- the nut element 7 is locked in rotation by means of cylindrical bars 2 and 4, the ends of which are housed in cylindrical cavities formed on the one hand (15 and 14) in the nut 7, and on the other hand ( 22 and 23) in the injector housing 5, said bars 2,4 passing right through an elastic washer 6 connecting said mass 20 to said injector body 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 injector housing 5, by means not shown, thus allowing an elastic connection between the mass 20 and the body of the injector 5 in the direction A.
- the rod 3 has, at its upper end, in the direction A, a threaded part 16 adapted to cooperate with a tapping produced on the nut element 7, as well as on the element against nut 9.
- the assembly of the assembly is carried out as follows. First of all, the rod 3 is screwed onto the nut element 7 until a desired prestress is obtained allowing the application of the opposite end of the rod 3 to 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 clearance 19 ensures that the ballast 8 is well constrained between the nut element 7 and the counter nut 9.
- the screwing of the element against the nut 9, the nut element 7 being locked in rotation by anti-rotation means (22 , 23,2,4,15 and 14), is done until obtaining an elastic deformation of the threads in the upper screw connection 16, at the maximum elastic deformation of the wave propagating in the rod 3, said deformation wave generating an annular ejection slot relative to the valve seat 25.
- the elastic washer 10, associated with the adjustment element 11, linked to the injector housing 5, for example by an assembly of the screw nut type, not shown, makes it possible to obtain the preload necessary for sealing the valve seat 25 , and is moreover necessary to make up for the clearances due in particular to thermal stresses and to the wear of the parts.
- the material of which the elastic washer 10 is made can be based on polymers. It preferably has 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 produced 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 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 housing 5 , said bar passing through the cup 6 connecting said mass 20 to said body 5, at the bottom of the cavity 21.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
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 true EP1340220A1 (fr) | 2003-09-03 |
| EP1340220B1 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 (5)
| 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. |
| FR3154391A1 (fr) | 2023-10-20 | 2025-04-25 | Thales | Capteur MEMS amélioré |
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 not_active Ceased
- 2001-10-19 EP EP01982522A patent/EP1340220B1/fr not_active Expired - Lifetime
- 2001-10-19 ES ES01982522T patent/ES2228962T3/es not_active Expired - Lifetime
- 2001-10-19 DE DE60107717T patent/DE60107717T2/de not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0235515A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002035515A1 (fr) | 2002-05-02 |
| DE60107717D1 (de) | 2005-01-13 |
| FR2816097A1 (fr) | 2002-05-03 |
| ES2228962T3 (es) | 2005-04-16 |
| FR2816097B1 (fr) | 2003-02-07 |
| EP1340220B1 (fr) | 2004-12-08 |
| DE60107717T2 (de) | 2005-05-19 |
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