WO2012095384A1 - Kraftstoffinjektor und verfahren zum herstellen eines kraftstoffinjektors - Google Patents
Kraftstoffinjektor und verfahren zum herstellen eines kraftstoffinjektors Download PDFInfo
- Publication number
- WO2012095384A1 WO2012095384A1 PCT/EP2012/050229 EP2012050229W WO2012095384A1 WO 2012095384 A1 WO2012095384 A1 WO 2012095384A1 EP 2012050229 W EP2012050229 W EP 2012050229W WO 2012095384 A1 WO2012095384 A1 WO 2012095384A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fuel injector
- separation
- elevation
- separation surface
- separating
- Prior art date
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
- 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
- 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
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/161—Means for adjusting injection-valve lift
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
Definitions
- the invention relates to a Kraftstoffinj ector according to the preamble of patent claim 1, and a method for producing a Kraftstoffinj ector according to the preamble of claim 10th
- Fuel injectors for injecting fuel into an internal combustion engine of a motor vehicle are known.
- the Kraftstoffinj the fuel supplied fuel can be under a very high pressure of up to several thousand bar.
- the object of the present invention is therefore to provide an improved fuel injector. This task is achieved by a Kraftstoffin ector with the features of claim 1. It is a further object of the present invention to provide an improved method of manufacturing a fuel injector. This object is achieved by a method having the features of patent claim 10. Preferred developments are specified in the dependent claims.
- An inventive fuel injector has a first component with a first separation surface and a second component with a second separation surface.
- the first separating surface and the second separating surface lie against each other.
- a bore passes through the first parting surface and the second parting surface.
- the first separation surface has a first relief-like elevation, which is arranged circumferentially around the bore.
- the first parting surface has a higher hardness than the second
- the bore is very well sealed in the region of the separating surfaces in this fuel injector.
- leaks in moisture- or fuel-sensitive areas of the injector can be prevented, for example penetration of fuel into a chamber having a piezoactuator.
- the fuel injector still has an advantageously smaller construction volume than a one-piece fuel injector designed without separating points.
- the hardness of the first parting surface is preferably higher than the hardness of the second by at least 30 degrees of hardness according to Vickers
- the hardness difference is even more preferably even at least 50 degrees of hardness according to Vickers.
- the first elevation has a step-shaped cross-section.
- the first protrusion encloses an approximately circular ⁇ disc-shaped portion of the first separation area. ⁇ advantage adhesive enough, causes the penetration of the first elevation of the first separation surface in the second separation area then only a small adverse local deformation of the second release surface.
- the first elevation of the first separation surface has at least partially penetrated into the second separation surface.
- this results in a good seal extending through the components bore, which may be caused by scratches or scuff marks channels or grooves interrupted and unevenness and roughness of the interfaces are compensated.
- the first survey of the first interface between 5 ⁇ and 100 ⁇ deeply penetrated into the second interface.
- this penetration depth leads to a reliable seal of the fuel injector.
- the first component is a lever housing or a high-pressure connection of the fuel injector.
- these components have a fuel injector parting surfaces that need to be sealed off ⁇ .
- the second component is an injector body of the fuel injector.
- Advantage ⁇ way legally has an injector even two sealed parting surfaces.
- the first separating surface has a second relief-like elevation, which is arranged circumferentially around the first relief-like elevation. ⁇ advantage adhesive enough, then causes the second survey to seal the bore and can serve as a safety margin. Even if the first survey due to a manufacturing error causes an imperfect seal of the bore, is second survey ensures complete sealing of the hole.
- An inventive method for fabricating a force stoffin ector includes method steps for providing a first member having a first release surface and a second component having a second release surface, wherein the first separation area having a higher hardness than the second separation ⁇ surface, a relief-like for generating Elevation on the first separation surface and for pressing the first separation surface and the second separation surface such that the collection of the first separation surface at least partially penetrates into the second separation surface.
- this method allows the production of very reliable seals that withstand even high pressures. This will prevent or minimize fuel injector leakage. This is particularly relevant in moisture- or fuel-sensitive areas of the fuel injector, for example in the area of a chamber with a piezoelectric actuator.
- the method requires relatively little effort in providing the parting surfaces.
- the resulting fuel injector still has a relatively small volume.
- a piezo space arranged in the second component for receiving a piezoactuator is shortened in such a way by pressing the parting surfaces against one another such that a desired idle stroke of the piezoactuator results.
- the method then simultaneously enables the production of a very reliable seal and a measuring adjustment of the piezo idle stroke.
- FIG. 1 shows a first sectional view of a fuel injector
- Figure 2 is a perspective view of a first parting surface of a lever housing;
- Figure 3 is a section through the lever housing;
- Figure 4 is a perspective view of a second
- FIG. 5 shows a detail of the second separating surface
- FIG. 6 shows a second section through the fuel injector
- Figure 7 is a perspective view of a third parting surface of an injector body.
- FIG. 8 shows a height profile of the third parting surface of FIG
- Figure 1 shows a sectional view of a part of a
- Fuel injector 100 The fuel injector 100 may be used to inject fuel into a cylinder of an internal combustion engine.
- the fuel can have a high pressure of up to over 2000 bar.
- the fuel injector consists of a plurality of individual components.
- the Injector body 300 visible.
- the lever housing 200 has a first separation surface 210.
- the injector body 300 has a second separation surface 310.
- the first separation surface 210 and the second separation surface 310 abut each other.
- a high pressure bore 110 extends through the injector body 300, the second interface 310, the first interface 210 and the lever housing 200.
- the high pressure bore 110 serves to supply the high pressure fuel. In order to minimize leakage of the fuel injector 100 ⁇ or completely avoided, it is necessary, the transition region between the first
- FIG. 2 shows a schematic perspective illustration of the lever housing 200 with the first separating surface 210.
- the lever housing 200 has a cylindrical shape. Accordingly, the first separation surface 210 is formed circular disk-shaped.
- the first separating surface 210 has the centrally arranged return bore 125 and the high-pressure bore 110 arranged in a radial outer region of the first separating surface 210.
- the first separating surface 210 may also have further holes to be sealed.
- the first separating surface 210 has an approximately annular
- Elevation 220 which extends concentrically around the center of the first separation surface 210.
- the inner diameter of the elevation 220 forms a first inner contour 240, on which the elevation 220 forms a step 230.
- the first inner contour 240 is approximately circular.
- the elevation forms a first outer contour 250, at which the elevation 220 in turn has a step 230.
- the outer diameter of the survey 220 is slightly lower than that
- the high-pressure bore 110 is arranged in the region between the first inner contour 240 and the first outer contour 250 of the elevation 220.
- the elevation 220 has a circular disk-shaped recess, whereby the elevation 220 forms a second inner contour 260 with a step 230, which rotates around the high-pressure bore 110.
- FIG. 3 shows a section through the lever housing 200 along the section axis AA indicated in FIG. Lengths and distances are not shown to scale. Recognizable are the return bore 125 annularly encircling first inner contour 240 and the high-pressure bore 110 annularly encircling second inner contour 260 of the survey 220.
- the first outer contour 250 of the survey 220 can be seen.
- the elevation 220 respectively forms the step 230, the height of which may lie in the range of a few tens of microns.
- the steps 230 preferably have nearly vertical flanks.
- the survey 220 and the remaining portions of the lever housing 200 are preferably integrally formed.
- the elevation 220 may have been generated, for example, by an embossing process of the first separating surface 210.
- Figure 4 shows a view of the cylindrical In ektor stresses 300 with the circular disk-shaped second separation surface 310.
- the second separation surface 310 of the injector body 300 has a plurality of holes. Centrally in the second separation surface 310 of the return chamber 120 is arranged. In an outer region of the second separating surface 310, the high-pressure bore 110 is arranged.
- the second separation surface 310 may have further holes.
- the second parting surface 310 of the injector body 300 has a lower hardness than the first parting surface 210 of the lever housing 200.
- the injector body 300 is preferably made of a softer material than the lever housing 200.
- the difference in hardness between the second parting surface 310 and the first parting surface 210 is thirty Vickers hardnesses, more preferably even more than fifty Vickers hardnesses.
- the injector body 300 and the second separation surface 310 may be Invar.
- the second separation surface 310 of the injector body 300 was first made as plan as possible and, for example, by grinding and / or polishing, free from bumps. Subsequently, the second separation surface 310 of the In ektor stresses 300 and the first separation surface 210 of the lever housing 200 were first pressed together and then separated again for investigation purposes.
- FIG. 4 shows the second separating surface 310 after the separation from the first separating surface 210.
- the survey 220 of the first separation surface 210 partially penetrated into the second separation surface 310 of the injector body 300 and has left after the separation of the lever housing 200 and the injector body 300 a recess 320, which is a negative of the survey 220 of the first separation surface 210th forms.
- the recess 320 is arranged annularly around the return 120.
- the recess 320 surrounds the high pressure bore 110. Because of the circular first inner contour 240 and the circular second inner contour 260 of the survey 220, the penetration of the projection 220 into the second separation surface 310 has a uniform symmetric Defor ⁇ tion of the second separation surface 310 causes. In the case of an asymmetrical design of the inner contours 240, 260, on the other hand, a disadvantageous asymmetrical deformation of the second separating surface 310 could occur.
- FIG. 5 shows a view of a detail of the second separating surface 310 in the vicinity of the high-pressure bore 110. It can be seen that the high-pressure bore 110 is initially enclosed by a ring of a non-recessed portion of the second separating surface 310, and a portion of the recessed region 220 on the radially outer side the second interface 310 connects. In this area of the recess 320, the survey 220 of the separation surface 210 had penetrated. The depth of the recess 320 may be, for example, between 5 ⁇ m and 25 ⁇ m. It has been found that this penetration depth is sufficient to compensate existing residual roughness of the parting surfaces 210, 310 and to produce a very reliable seal between the parting surfaces 210, 310.
- Figure 6 shows a further sectional view of the motor ⁇ stoffinj ector 100.
- Figure 6 shows a to the in figure 1 shown portion of the Kraftstoffin ector 100 on ⁇ closing section of the Kraftstoffin ektors 100th
- FIG. 6 shows an upper region of the injector body 300 and a high-pressure port 400 adjoining the injector body 300.
- the injector body 300 has a third separation surface 330 and the high-pressure port 400 has a fourth separation surface 410.
- the high-pressure bore 110 runs through the high-pressure port 400, through the fourth separating surface 410 and through the third separating surface 330 into the injector body 300.
- the injector body 300 has a piezo chamber 130, in which a piezoelectric actuator (not shown) is arranged.
- the piezo chamber 130 forms an opening in the third separation surface 330 of the injector body 300 and is thus opened to the high pressure port 400.
- the high-pressure connection 400 has a punch 420, which extends from the fourth separating surface 410 partly into the piezo-chamber 130 in the injector body 300.
- the fourth separating surface 410 is again harder than the third separating surface 330 is formed.
- the fourth separation surface 410 of the high pressure port may have the same hardness as the first parting surface of the lever housing 200.
- the fourth separation surface 410 again has a non-recognizable in Figure 6 survey, which is a closed contour around each sealed opening in the fourth
- Parting surface 410 for example, so as a closed contour around the punch 420 and the high-pressure bore 110 extends.
- the inner contour of the elevation at the fourth separating surface 410 is preferably formed again circularly symmetrical to a disadvantageous asymmetric deformation of the softer third Separation area 330 in the area to be sealed holes to avoid.
- Figure 7 shows a schematic representation of the third separation surface 330 of the In ektor stresses 300 after it was first pressed together with the fourth separation surface 410 of the high pressure port 400 and then again separated from the fourth separation surface 410 of the high pressure port 400.
- a recess 340 has formed in the third separating surface 330 of the body member 300, which recess corresponds to a negative of the elevation on the fourth separating surface 410 of the high-pressure connection 400.
- the recess has a third inner contour 350, which extends symmetrically and in a circle around the piezo space 130.
- the recess 340 encloses the high pressure bore 110 in the third interface 330 completely and also circular.
- the second outer contour 360 of the recess 340 in the third separation surface 330 is not circular.
- the exact design of the outer contour 360 is not critical and does not have to be circular, since an asymmetrical deformation of the third separating surface 330 in the region of the second outer contour 360 is not detrimental.
- FIG. 8 shows a schematic illustration of a height profile of the third separating surface 330 after being pressed together with the fourth separating surface 410 of the high-pressure connection 400. It can be seen that the depression 340 has formed in the third separating surface 330.
- the depth of the recess 340 may, for example, between 5 ⁇ and 25 ⁇ lie. However, the recess 340 may be deeper.
- FIG. 6 shows that the punch 420 of the high-pressure port 400 partially penetrates into the piezo space 130 in the injector body 300.
- a piezoelectric actuator of the fuel injector 100 is arranged in the piezoelectric chamber 130.
- the piezoelectric actuator should have a given desired idle stroke. Due to manufacturing tolerances in the manufacture of components of the Kraftstoffin ektors 100 may cause slight variations in length of the piezoelectric chamber 130, which lead to a variation of the idle stroke of the piezoelectric actuator. These variations must be balanced to achieve the desired idle stroke of the piezoelectric actuator. For this purpose, the penetration of the punch 420 can serve in the piezo chamber 130.
- the elevation of the fourth separating surface 410 can be pushed into the third separating surface 330 until the punch 420 has penetrated into the piezoelectric chamber 130 so far in that the desired idle stroke of the piezoelectric actuator in the piezoelectric chamber 130 has resulted.
- the elevation of the fourth separating surface 410 can be pushed deep into the third separating surface 330 of the injector body 300 by up to 100 ⁇ m.
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- 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
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112012000478T DE112012000478A5 (de) | 2011-01-13 | 2012-01-09 | Kraftstoffinjektor und Verfahren zum Herstellen eines Kraftstoffinjektors |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201110008468 DE102011008468A1 (de) | 2011-01-13 | 2011-01-13 | Kraftstoffinjektor und Verfahren zum Herstellen eines Kraftstoffinjektors |
DE102011008468.1 | 2011-01-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012095384A1 true WO2012095384A1 (de) | 2012-07-19 |
Family
ID=45470566
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2012/050229 WO2012095384A1 (de) | 2011-01-13 | 2012-01-09 | Kraftstoffinjektor und verfahren zum herstellen eines kraftstoffinjektors |
Country Status (2)
Country | Link |
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DE (2) | DE102011008468A1 (de) |
WO (1) | WO2012095384A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108488017A (zh) * | 2018-05-24 | 2018-09-04 | 海盐海博特机械有限公司 | 一种使用方便的喷油嘴管体 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000060233A1 (de) | 1999-03-31 | 2000-10-12 | Siemens Aktiengesellschaft | Kraftstoffeinspritzventil für eine brennkraftmaschine |
DE10115214A1 (de) | 2001-03-28 | 2002-10-10 | Bosch Gmbh Robert | Kraftstoffhochdrucksystem für Brennkraftmaschinen |
JP2002317730A (ja) * | 2001-04-25 | 2002-10-31 | Denso Corp | 燃料噴射装置 |
EP1340907A2 (de) * | 2002-03-01 | 2003-09-03 | Robert Bosch Gmbh | Verfahren zur Herstellung eines Kraftstoffeinspritzventils |
EP1445477A1 (de) * | 2003-01-24 | 2004-08-11 | Siemens VDO Automotive S.p.A. | Messvorrichtung mit Durchfluss-Kalibriereinrichtung sowie Verfahren zur Einstellung der Durchflussmenge der Messvorrichtung |
WO2005054522A1 (de) * | 2003-12-05 | 2005-06-16 | Siemens Aktiengesellschaft | Verfahren zum selektiven härten von dichtflächen |
DE102005060667A1 (de) * | 2005-12-19 | 2007-06-28 | Robert Bosch Gmbh | Hochdruckverbindung und Verfahren zum Herstellen einer Hochdruckverbindung |
-
2011
- 2011-01-13 DE DE201110008468 patent/DE102011008468A1/de not_active Withdrawn
-
2012
- 2012-01-09 DE DE112012000478T patent/DE112012000478A5/de not_active Ceased
- 2012-01-09 WO PCT/EP2012/050229 patent/WO2012095384A1/de active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000060233A1 (de) | 1999-03-31 | 2000-10-12 | Siemens Aktiengesellschaft | Kraftstoffeinspritzventil für eine brennkraftmaschine |
DE10115214A1 (de) | 2001-03-28 | 2002-10-10 | Bosch Gmbh Robert | Kraftstoffhochdrucksystem für Brennkraftmaschinen |
JP2002317730A (ja) * | 2001-04-25 | 2002-10-31 | Denso Corp | 燃料噴射装置 |
EP1340907A2 (de) * | 2002-03-01 | 2003-09-03 | Robert Bosch Gmbh | Verfahren zur Herstellung eines Kraftstoffeinspritzventils |
EP1445477A1 (de) * | 2003-01-24 | 2004-08-11 | Siemens VDO Automotive S.p.A. | Messvorrichtung mit Durchfluss-Kalibriereinrichtung sowie Verfahren zur Einstellung der Durchflussmenge der Messvorrichtung |
WO2005054522A1 (de) * | 2003-12-05 | 2005-06-16 | Siemens Aktiengesellschaft | Verfahren zum selektiven härten von dichtflächen |
DE102005060667A1 (de) * | 2005-12-19 | 2007-06-28 | Robert Bosch Gmbh | Hochdruckverbindung und Verfahren zum Herstellen einer Hochdruckverbindung |
Also Published As
Publication number | Publication date |
---|---|
DE102011008468A1 (de) | 2012-07-19 |
DE112012000478A5 (de) | 2013-10-17 |
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