EP3824174A1 - Dispositif d'injection a rampe commune - Google Patents
Dispositif d'injection a rampe communeInfo
- Publication number
- EP3824174A1 EP3824174A1 EP19752733.6A EP19752733A EP3824174A1 EP 3824174 A1 EP3824174 A1 EP 3824174A1 EP 19752733 A EP19752733 A EP 19752733A EP 3824174 A1 EP3824174 A1 EP 3824174A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injection well
- nozzle
- conduit
- injection
- main chamber
- 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
- 238000002347 injection Methods 0.000 title claims abstract description 108
- 239000007924 injection Substances 0.000 title claims abstract description 108
- 239000000446 fuel Substances 0.000 claims abstract description 24
- 230000010287 polarization Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
- F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
-
- 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
-
- 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
- F02M2200/28—Details of throttles in fuel-injection apparatus
-
- 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
- F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
- F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
-
- 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
- F02M2200/85—Mounting of fuel injection apparatus
- F02M2200/856—Mounting of fuel injection apparatus characterised by mounting injector to fuel or common rail, or vice versa
Definitions
- the present invention relates to a common rail injection device for an internal combustion engine.
- the prior art injection devices include a common rail having a main chamber, an inlet opening into the main chamber and intended to be connected to a fuel supply tube, a plurality of wells d 'injection which are distributed along the common rail and are each intended to receive an injector and a plurality of conduits each allowing to connect the main chamber to one of the injection wells.
- the injection wells are offset relative to the main chamber of the common rail.
- the geometric axis of the injection wells does not cross the main chamber of the common rail.
- the machining is carried out transversely to the common rail through the main chamber of the common rail.
- the injection devices are fitted with nozzles which are formed by reducing the fuel flow section so as to generate a pressure drop which makes it possible to absorb the pressure waves.
- nozzles which are formed by reducing the fuel flow section so as to generate a pressure drop which makes it possible to absorb the pressure waves.
- the first consists in fitting into the conduit connecting the main chamber of the common rail to the injection well a cylindrical element pierced axially. This fitting is particularly difficult to achieve, given the restricted accessibility of the conduits, for the aforementioned structures in which the injection wells are offset relative to the main chamber of the common rail.
- the conduit connecting the main chamber to the injection well has at the junction between said conduit and the injection well a lower section.
- the machining of this smaller section requires the use of a drill of small diameter but of great length to reach 1 end of the conduit.
- the use of a small drill over such a long length makes it fragile with the risk of generating numerous manufacturing rejects and defects on the finished product.
- One of the aims of the present invention is therefore to provide an injection device comprising a common rail, which makes it possible to obviate the above drawbacks.
- Another object of the invention is to provide such a device, the production of which is simple and inexpensive.
- an injection device comprising a common rail extending in a longitudinal direction and defining a main chamber, the common rail comprising:
- At least one injection well extending along a first axis, said injection well comprising a bottom and an injector interface zone in which an injector is intended to be mounted;
- At least one transverse conduit extending along a second axis and opening into the main chamber, on the one hand, and into the bottom of the injection well, on the other hand, so as to connect the main chamber to said well d injection, the first and second axes being intersecting;
- nozzle arranged in the bottom of the injection well and reducing the fuel passage section between the conduit and the injector interface zone of the injection well.
- such an injection device may have one or more of the following characteristics.
- the nozzle is a cylindrical element which is fitted into the bottom of the injection well and which provides a space for the passage of fuel from the conduit to the injector interface zone.
- a cylindrical nozzle element can thus be fitted more easily into the bottom of the injection well than when it must be fitted into the duct connecting the main chamber to the bottom of the injection well.
- the cylindrical element is force-fitted into the bottom of the injection well.
- the bottom of the injection well has a diameter smaller than that of the injector interface zone. This facilitates the fitting of the cylindrical nozzle element in the bottom of the injection well.
- the nozzle comprises at least a first channel and a second channel opening into one another and opening respectively opposite the injector interface zone and opposite the conduit, the first channel and the second channel having a diameter smaller than that of the conduit.
- the nozzle is in abutment against the end of the injection well. This ensures precise axial positioning of the cylindrical element along the first axis.
- the cylindrical element comprises polarization means making it possible to guarantee a positioning of the nozzle with respect to the bottom of the injection well in a relative position such that the second channel is directed opposite the conduit.
- the cylindrical element provides a space for the passage of fuel between the conduit and a bottom area formed between the cylindrical element and one end of the injection well, the cylindrical element further comprising a channel crossing oriented along the first axis, opening on the one hand in said bottom area and, on the other hand in the injector interface area.
- the through channel oriented along the first axis has a diameter less than that of the conduit.
- the cylindrical element provides a space for the passage of fuel between the conduit and an area of the bottom formed between the cylindrical element and one end of the injection well, the cylindrical element further comprising a flat providing a space between the cylindrical element and a wall of the bottom of the injection well allowing the passage of fuel from said bottom area to the injector interface area.
- the first geometric axis crosses the pipe and the bottom of the injection well has a diameter smaller than that of the pipe and thus forms the nozzle. Drilling such a bottom of an injection well forming a nozzle requires drills that are shorter than those necessary for machining a nozzle in the axis of the conduit connecting the main chamber to the bottom of the injection well. The realization of such a nozzle is therefore simpler and generates less waste.
- FIG. 1 is a perspective view of an injection device.
- FIG. 2 is a vertical sectional view along the plane II-II of the injection device of Figure 1.
- FIG. 3 is a sectional view along the plane lll-lll of Figure 2, showing an injection well.
- Figure 4 is a view similar to that of Figure 2 for an injection device according to a second embodiment.
- - Figure 5 is a view similar to that of Figure 2 for an injection device according to a third embodiment.
- - Figure 6 is a view similar to that of Figure 2 for an injection device according to a fourth embodiment.
- Figure 7 is a view similar to that of Figure 2 for an injection device according to a fifth embodiment.
- FIG. 8 is a perspective view of the nozzle of Figure 7.
- FIG. 9 is a sectional view for an injection device according to a sixth embodiment.
- FIG. 1 represents an injection device designated as a whole by the reference 1.
- the injection device 1 comprises a common rail 2 which extends in a longitudinal direction.
- the common rail 2 is hollow and thus defines a main chamber 4 of tubular shape, illustrated in FIG. 2, extending in the longitudinal direction of the common rail 2.
- the common rail 2 is advantageously made in one piece, by example by a forging process.
- the common rail 2 has an inlet 3 opening into the main chamber 4 of the common rail 2 and intended to be connected to a fuel supply tube, not shown.
- the common rail 2 comprises injection wells 5 which are each intended to receive an injector 9, partially illustrated in FIG. 2.
- Each of the injection wells 5 extends according to a geometric axis A.
- the injection wells 5 are offset relative to the main chamber 4. In other words, the geometric axis A of each injection well 5 does not pass through the main chamber 4.
- Each injection well 5 has a bottom 5a and an injector interface zone 5b in which the injector is mounted 9.
- the bottom 5a like the injector interface zone 5b of each injection well 5 has a generally cylindrical shape.
- the main chamber 4 of the common rail 2 is connected to each of the injection wells 5 by means of a conduit 6.
- Each conduit 6 has a cylindrical shape extending along an axis B which intersects the axis A.
- Each conduit 6 opens, on the one hand, into the main chamber 4, and, on the other hand, into the bottom 5a of one of the injection wells 5 and thus makes it possible to conduct the fuel from the main chamber 4 to said well d injection 5.
- the duct 6 opens laterally, that is to say at the level of the peripheral wall of the bottom 5a of the injection well 5.
- each conduit 6 is machined transverse to the longitudinal axis of the common rail 2 and by the side of the common rail 2 opposite the wells injection 5.
- a through hole 7 is necessarily formed, in the common rail 2, opposite said conduit 6.
- the hole 7 extends coaxially to the geometric axis B of the conduit 6.
- the diameter of the conduit 6 is for example between 3 and 5 mm.
- the axis B passes through the central axis of the main chamber 4.
- the bore 7 is intended to be closed in leaktight manner by means of a closure device, not shown.
- the injection device 1 comprises a nozzle 8 formed in the bottom 5a of each of the injection wells 5.
- the nozzle 8 aims to reduce the cross-section of fuel passage between the conduit 6 and the injector interface zone 5b of the injection well 5.
- the nozzle 8 thus generates a pressure drop which makes it possible to damp the pressure waves.
- the nozzle 8 is a cylindrical element which is force fitted into the bottom 5a of the injection well 5.
- the nozzle 8 is for example made of stainless steel.
- the bottom 5a has a diameter smaller than that of the injector interface zone 5b.
- the nozzle 8 comprises a frustoconical portion 20 which is positioned, along the axis A, opposite the duct 6 and which thus allows the fuel to penetrate into the bottom 5a of the injection well 5, and more particularly in a zone located between the end 11 of the injection well 5 and the nozzle 8.
- the nozzle 8 also has a through channel 10, which is oriented along the axis A of the injection well 5 and thus makes it possible to conduct fuel from the aforementioned bottom area 5a from the injection well 5 to the injector interface zone ôb.
- the channel 10 passes through the nozzle 8 at its center.
- FIGS. 4 to 7 differ from the embodiment described above in relation to FIGS. 2 and 3 only in the structure of the nozzle 8.
- the nozzle 8 has a through channel 10 which is oriented along the axis A of the injection well 5 and which passes through said nozzle 8.
- the nozzle 8 further comprises one or more channels 13 transverse which pass through the nozzle 8 radially.
- the channels 13 pass through the channel 10 and are advantageously perpendicular to said channel 10.
- the nozzle 8 is oriented in the bottom 5a of the injection well 5 so that one of the channels 13 opens facing the conduit 6. Thanks to the plurality of channels 13, there is a greater number of positions making it possible to ensure a relative positioning of the nozzle 8 with respect to the injection well 5 in which one of the channels 13 opens facing the conduit 6.
- the nozzle 8 comprises polarizing means making it possible to guarantee a positioning of the nozzle 8 in a relative position such that one of the channels 13 is directed opposite the conduit 6.
- the polarization means are formed by a visual indication provided on the lower surface of the nozzle 8.
- the bottom 5a of the well injection and the nozzle 8 each have a complementary geometric singularity making it possible to ensure mechanical coding.
- the nozzle 8 has a through channel 10 which is oriented along the axis A of the injection well 5 and which passes through said nozzle 8.
- the nozzle 8 further comprises a blind channel 15 which is oriented, in a radial orientation to the axis A, perpendicular to said channel 10.
- the channel 15 opens facing the conduit 6 and, on the other hand, it joins the channel 10 so as to allow passage fuel from the pipe 6 to the injector interface zone 5b of the injection well 5.
- the nozzle 8 comprises polarization means, as described above, making it possible to guarantee a positioning of the nozzle in a position such that the channel 15 is directed opposite the duct 6.
- the nozzle 8 has a channel 16 which is oriented along the axis A.
- the channel 16 is blind, that is to say that it opens only opposite the area d injector interface 5b of the injection well 5a.
- the nozzle 8 further comprises another channel 15, also blind, which is oriented, in a radial orientation to the axis A, perpendicular to said channel 16.
- the channel 15 opens opposite the conduit 6 and joins the channel 16 so as to allow the passage of fuel from line 6 to the injector interface zone 5b of the injection well 5.
- the nozzle 8 is also likely to include polarizing means.
- the nozzle 8 abuts against the end 11 of the injection well 5, which ensures correct positioning of the nozzle 8, and more particularly of the channel 15, along of axis A.
- the channels 10, 13, 15, 16 have a diameter smaller than that of the conduit 6 in order to generate a pressure drop.
- their diameter is between 0.75 to 1.5 mm.
- the nozzle 8 has no channel but has a flat 8c extending over the entire length of said nozzle 8.
- the nozzle 8 is fitted in the bottom 5a of the injection well 5 so as to preserve a space 18 between the duct 6 and a zone situated between the end 11 of the injection well 5 and the nozzle 8.
- the flat 8c thus makes it possible to provide space between the nozzle 8 and the cylindrical wall of the bottom 5a of the injection well 5 a space 19 allowing the passage of the fuel towards the injector interface zone 5b.
- the axis A of the injection well 5 passes through the conduit 6 so that the bottom 5a of the injection well 5 opens into the conduit 6.
- the bottom 5a of the well 5 which connects the injector interface zone 5b with the conduit 6 has a diameter smaller than that of the conduit 6 and that of the injector interface zone 5b.
- the bottom 5a of the injection well 5a which forms the nozzle 8 generating a pressure drop allowing the pressure waves to be damped.
- the diameter of the bottom 5a of the injection well 5 is for example between 0.75 to 1.5 mm.
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 (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1856543A FR3083830B1 (fr) | 2018-07-16 | 2018-07-16 | Dispositif d'injection a rampe commune |
PCT/FR2019/051770 WO2020016513A1 (fr) | 2018-07-16 | 2019-07-15 | Dispositif d'injection a rampe commune |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3824174A1 true EP3824174A1 (fr) | 2021-05-26 |
EP3824174B1 EP3824174B1 (fr) | 2023-09-13 |
Family
ID=63491768
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19752733.6A Active EP3824174B1 (fr) | 2018-07-16 | 2019-07-15 | Dispositif d'injection a rampe commune |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3824174B1 (fr) |
JP (1) | JP2021535322A (fr) |
FR (1) | FR3083830B1 (fr) |
WO (1) | WO2020016513A1 (fr) |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001071179A2 (fr) * | 2000-03-21 | 2001-09-27 | Siemens Aktiengesellschaft | Ensemble injecteur de carburant utilise pour installer un injecteur de carburant sur une rampe de carburant et pour assurer l'alignement de l'injecteur de carburant |
JP2001349266A (ja) * | 2000-06-08 | 2001-12-21 | Toyota Motor Corp | 燃料噴射弁 |
JP3694228B2 (ja) * | 2000-09-18 | 2005-09-14 | 株式会社オティックス | デリバリパイプ |
JP2006233858A (ja) * | 2005-02-24 | 2006-09-07 | Denso Corp | コモンレール式燃料噴射装置 |
DE102005061882A1 (de) * | 2005-12-23 | 2007-07-05 | Robert Bosch Gmbh | Vorrichtung zur Dämpfung von Druckschwingungen in einem Hochdrucksammelraum |
DE102007049357A1 (de) * | 2007-10-15 | 2009-04-16 | Robert Bosch Gmbh | Brennstoffeinspritzvorrichtung |
JP5823336B2 (ja) * | 2012-04-04 | 2015-11-25 | 株式会社オティックス | 燃料分配管 |
DE102012206241A1 (de) * | 2012-04-17 | 2013-10-17 | Robert Bosch Gmbh | Vorrichtung zum Niederhalten eines Ventils zum Zumessen von Kraftstoff |
DE102013203537A1 (de) * | 2013-03-01 | 2014-09-04 | Robert Bosch Gmbh | Brennkraftmaschine |
-
2018
- 2018-07-16 FR FR1856543A patent/FR3083830B1/fr active Active
-
2019
- 2019-07-15 WO PCT/FR2019/051770 patent/WO2020016513A1/fr unknown
- 2019-07-15 JP JP2021525382A patent/JP2021535322A/ja active Pending
- 2019-07-15 EP EP19752733.6A patent/EP3824174B1/fr active Active
Also Published As
Publication number | Publication date |
---|---|
WO2020016513A1 (fr) | 2020-01-23 |
EP3824174B1 (fr) | 2023-09-13 |
JP2021535322A (ja) | 2021-12-16 |
FR3083830A1 (fr) | 2020-01-17 |
FR3083830B1 (fr) | 2021-10-01 |
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