EP1438500A1 - Dispositif de fixation d'un moyen de rupture d'impedance acoustique sur une tige - Google Patents
Dispositif de fixation d'un moyen de rupture d'impedance acoustique sur une tigeInfo
- Publication number
- EP1438500A1 EP1438500A1 EP02795330A EP02795330A EP1438500A1 EP 1438500 A1 EP1438500 A1 EP 1438500A1 EP 02795330 A EP02795330 A EP 02795330A EP 02795330 A EP02795330 A EP 02795330A EP 1438500 A1 EP1438500 A1 EP 1438500A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rod
- mass
- screws
- adjustable stop
- connection
- 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
- F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
-
- 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
- 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
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs
-
- 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
- F02M2200/29—Fuel-injection apparatus having rotating means
-
- 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
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
- F02M2200/306—Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
-
- 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
- F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
-
- 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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
-
- 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
- F02M61/166—Selection of particular materials
Definitions
- the present invention relates to a device for breaking acoustic impedance in a given area of a rod of a fuel injection device.
- the present invention relates more particularly to an assembly means between a rod and a mass so as to produce an impedance break.
- Said rod being intended to cooperate at one of its ends with a seat and the other of its ends with the aforementioned mass.
- the object of the present invention makes it possible to produce both a bilateral elastic connection between the rod and the aforementioned mass, a take-up of play of said rod on its seat by means of elastic return means and a mechanical filter. low pass.
- Such a device may, 'for example, be used in an injection device as described in patents FR 2801346 and FR 2792369, 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 one of its ends an annular slot of ejection with respect to a valve seat, said rod or needle cooperating at its other end with a mass, said mass cooperating with elastic return means housed in a cavity formed in the rear part of the injector housing.
- the impedance break at the end of the stem is ensured by adding the 'end of said rod of a mass consisting of a single element, inside which is formed a bore of diameter substantially identical to that of the needle, said bore being intended to be at least partially traversed 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 we are confronted with the delicate problem of ensuring a bidirectional elastic connection between said rod and the mass whatever the operating conditions, while allowing, when the injector is at rest, keeping the needle on the seat. Furthermore, the connection between the mass and the needle must be shaped so as not to hinder on the one hand the assembly of the injection device and on the other hand, ensure an excellent break in acoustic impedance, guaranteeing '' better wave reflection in the rod.
- the present invention aims to improve the connection device between the rod of the needle of the injection device and the acoustic impedance breaking means by proposing a new architecture for the connection between the needle and a composite mass or no. This connection is characterized in that it has a high robustness, a great ease of implementation, and thus allows several successive assemblies of the system with excellent reproducibility, and without this ultimately affecting quality and reproducibility. of the link.
- the device for fixing an acoustic impedance breaking means on a rod of a fuel injection device the impedance breaking being ensured by mounting the rod in a mass comprising elastic return means, the rod being formed in an elastic solid, and on which an ultrasonic type deformation wave can propagate, characterized in that the rod comprises intermediate means of mounting with the mass, the means mounting intermediate ensuring a first fixed unilateral connection between the mass and the rod, the device also comprises an adjustable stop cooperating with the mass and the rod so as to form a second unilateral adjustable connection between the rod and the mass, in the opposite direction at the first fixed unilateral connection, the adjustment of the stop being made until a contact is obtained between the stop and the end of the rod so as to form a bilateral connection without play between the rod and the mass.
- the elastic deformation of the elastic return means makes it possible to assemble the system constituted by the mass, the needle and the housing of the injection device.
- the rod comprises at its end a series of obviously cylindrical forming grooves, the grooves being intended to cooperate with an intermediate piece thus forming the unidirectional stop.
- said intermediate piece has at least two separate parts to allow the establishment of the connection with the grooved end of the needle.
- the intermediate piece has an internal shape complementary to the grooves formed on the end of the needle.
- the intermediate part has an external shape of revolution, at least partially conical, so as to cooperate with the mass by means of a cone-to-cone connection.
- the first member is constituted by a needle comprising a cylindrical rod 3, formed in an elastic solid, housed movable axially inside an injector housing 5. Sealing means are formed by a first end 26 of the rod 3 and the seat 25, the end 26 cooperating with the seat 25 secured to the injector housing 5.
- the second end 8 of the rod 3 comprises, for example, grooves over a determined length in order to cooperate, as we will see below with intermediate mounting means 6 and 7.
- the second member is constituted by a cylindrical monobloc mass 20, axially movable, housed in a cavity 21 formed in the injector housing 5, capable of receiving fuel under pressure.
- This mass 20 is crossed in its center by a first bore 12 which allows the passage of the rod 3.
- the bore 12 is extended in the upper part of the mass 20 by a second bore 13 of greater diameter.
- the bores 12 and 13 are separated by a conical shoulder 9, intended to cooperate with the intermediate mounting means 6 and 7 which we will describe below.
- the end of the second bore ends in a partially threaded part 16, of diameter greater than the bores 12 and 13 so as to be able to screw inside the thread 16 an adjustable stop 17 intended to come to cooperate with the second end 8 of the rod 3.
- the mass 20 is blocked in rotation and guided in translation by means of two cylindrical bars 2 and 4.
- the first 14, 15 of each bar 2, 4 is housed in cylindrical cavities formed in the mass 20 while the second end 22, 23 of bar 2, 4 is housed in the injector housing 5.
- the bars 2.4 pass right through an elastic washer 10 connecting the mass 20 to the injector body 5, at the bottom of the cavity 21.
- the elastic washer forms elastic return means.
- the third member consisting of intermediate mounting means 6 and 7, comprising for example two separate parts, is intended to cooperate on the one hand with the second end 8 of the rod 3 and on the other hand with the surfaces formed by the second bore 13 and the shoulder 9 of the mass 20.
- the intermediate means 6 and 7 form a cylinder, the internal bore of which has circular grooves which cooperate with the end 8 of the rod 3 which also has complementary grooves.
- the outer surface 11 of the cylinder formed by the two parts 6 and 7 assembled from the intermediate mounting means has a partially conical end opposite the shoulder 9 in order to allow centering. and the locking in translation of the needle 3 when a prestressing force necessary for sealing the valve seat 25 is applied to the mass 20 in the direction
- the assembly of the assembly is carried out as follows.
- the rod 3 being held in abutment on its seat, the elastic material 10 is compressed by pressing on the mass 20 so as to sufficiently release the end 8 of the rod 3 to come to assemble the parts 6 and 7 around the grooves.
- the force is then released on the mass 20 and the parts 6 and 7 cooperate with the mass 20 and center along the conical surface 9, thus ensuring the maintenance of the needle 3.
- the adjustable stop 17 is then screwed inside the thread 16, so as to cooperate with the end 8 of the rod 3.
- the means for locking in rotation are provided by a removable cylindrical bar not shown and the end of which is housed in a cylindrical cavity 222 formed inside the injector housing 5.
- the cylindrical bar is positioned inside said cylindrical cavity 222 and cooperates with the mass 20 by means of a through bore 214 formed successively in said mass 20 and in the means of elastic return .10, thus blocking the mass 20 in rotation relative to the housing 5.
- the blocking in rotation of the mass 20 is carried out temporarily, during assembly, thus allowing the mass 20 and rod 3 assembly, in normal operation, to be free to rotate relative to the housing. of injector 5.
- This freedom of rotation can prove to be advantageous for uniformly distributing the wear of the shutter means formed as we have seen previously by the end 26 of the rod and the seat 25.
- the composite mass is composed of two distinct parts 320 and 321.
- the upper part 320 of the mass cooperates in the same way as previously with the intermediate mounting means 6 and 7 via 'an at least partially conical contact surface 9 formed at the end of the mass 20.
- the adjustable stop 317 is constituted by a cylindrical piece intended to come to cooperate with the end 8 of the rod 3.
- the stop 317 is held resting on the end 8 of the rod 3 by means of two clamping means 322 and 323, which may for example be a stud and nut assembly, and which provide the connection between the stop 317 and. the lower part 321 of the mass.
- the means for clamping 322 and- 323 may be diametrically opposed and cross right through the upper portion 320 of the mass through two bores 324 and 325 conformed to the interior of the mass 320.
- the clamping means 322 and 323 cooperate with the lower part 321 of the mass 20 by means of two threads 326 and 327 formed in the lower part 321 of the mass 20 in the extension of the bores 324 and 325.
- clamping means 322 and 323 the positioning of which symmetrical with respect to the axis of the rod 3 allows assembly of the adjustable stop 317 without it being necessary to block in rotation by additional means the two parts 320 and 321 of the mass 20.
- clamping means 322 and 323 between the lower part 321 of the mass and the member 317 constituting the adjustable stop can be produced by means of two screws.
- the mass 320 can be in one piece, in a material of the steel type for example, and the threads 327 and 326 can, then be formed in an outlet manner or not, directly in the monoblock mass 320.
- the invention is in no way limited to the embodiments described and illustrated, which have been given only by way of example.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0113791 | 2001-10-25 | ||
FR0113791A FR2831613B1 (fr) | 2001-10-25 | 2001-10-25 | Dispositif de fixation d'un moyen de rupture d'impedance acoustique sur une tige d'un dispositif d'injection de carburant |
PCT/FR2002/003576 WO2003036077A1 (fr) | 2001-10-25 | 2002-10-18 | Dispositif de fixation d'un moyen de rupture d'impedance acoustique sur une tige |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1438500A1 true EP1438500A1 (fr) | 2004-07-21 |
EP1438500B1 EP1438500B1 (fr) | 2005-04-13 |
Family
ID=8868702
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02795330A Expired - Fee Related EP1438500B1 (fr) | 2001-10-25 | 2002-10-18 | Dispositif de fixation d'un moyen de rupture d'impedance acoustique sur une tige |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1438500B1 (fr) |
DE (1) | DE60203727T2 (fr) |
ES (1) | ES2236613T3 (fr) |
FR (1) | FR2831613B1 (fr) |
WO (1) | WO2003036077A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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. |
FR2906848B1 (fr) * | 2006-10-09 | 2012-04-20 | Renault Sas | Dispositif de maintien d'une aiguille d'un injecteur de carburant, et injecteur de carburant associe |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2792369B1 (fr) | 1999-04-15 | 2001-05-11 | Renault | Dispositif d'injection de carburant pour moteur a combustion interne |
FR2801346B1 (fr) | 1999-11-19 | 2002-10-31 | Renault | Dispositif d'injection de carburant pour moteur a combustion interne |
FR2816097B1 (fr) * | 2000-10-27 | 2003-02-07 | Renault | Dispositif de rupture d'impedance acoustique d'une tige |
-
2001
- 2001-10-25 FR FR0113791A patent/FR2831613B1/fr not_active Expired - Lifetime
-
2002
- 2002-10-18 DE DE60203727T patent/DE60203727T2/de not_active Expired - Lifetime
- 2002-10-18 EP EP02795330A patent/EP1438500B1/fr not_active Expired - Fee Related
- 2002-10-18 WO PCT/FR2002/003576 patent/WO2003036077A1/fr not_active Application Discontinuation
- 2002-10-18 ES ES02795330T patent/ES2236613T3/es not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO03036077A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE60203727D1 (de) | 2005-05-19 |
WO2003036077A1 (fr) | 2003-05-01 |
ES2236613T3 (es) | 2005-07-16 |
FR2831613A1 (fr) | 2003-05-02 |
EP1438500B1 (fr) | 2005-04-13 |
DE60203727T2 (de) | 2006-02-09 |
FR2831613B1 (fr) | 2004-01-23 |
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