EP1395747A1 - Kraftstoffeinspritzventil für brennkraftmaschinen - Google Patents
Kraftstoffeinspritzventil für brennkraftmaschinenInfo
- Publication number
- EP1395747A1 EP1395747A1 EP02727264A EP02727264A EP1395747A1 EP 1395747 A1 EP1395747 A1 EP 1395747A1 EP 02727264 A EP02727264 A EP 02727264A EP 02727264 A EP02727264 A EP 02727264A EP 1395747 A1 EP1395747 A1 EP 1395747A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel injection
- valve
- valve body
- injection valve
- bore
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 48
- 238000002347 injection Methods 0.000 title claims abstract description 42
- 239000007924 injection Substances 0.000 title claims abstract description 42
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 21
- 239000004917 carbon fiber Substances 0.000 claims description 21
- 239000000835 fiber Substances 0.000 claims description 17
- 239000011159 matrix material Substances 0.000 claims description 16
- 239000003822 epoxy resin Substances 0.000 claims description 9
- 229920000647 polyepoxide Polymers 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000002131 composite material Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920005594 polymer fiber Polymers 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 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
- 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
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
-
- 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 invention is based on a fuel injection valve for internal combustion engines according to the preamble of claim 1.
- a fuel injection valve for example from the document DE 196 18 650 AI.
- Such a fuel injection valve has a valve body, in which a bore is formed with a longitudinal axis, a valve seat being formed at the end of the bore on the combustion chamber side. In the area of the valve seat, at least one injection opening is formed in the valve body, which connects the bore to the combustion chamber of the internal combustion engine.
- a valve member is arranged in the bore in a longitudinally displaceable manner and is guided in the bore in a section facing away from the combustion chamber.
- the valve member merges into a sealing surface which interacts with the valve seat and thus controls the at least one injection opening.
- a pressure chamber is formed between the valve member and the wall of the bore, which can be filled with fuel under high pressure. Due to the fuel pressure in the pressure chamber, the valve member moves against a closing force, so that depending on the ratio of the closing force to the hydraulic force, the valve member and the injection opening are opened or closed.
- the Known fuel injection valve has the disadvantage that the fuel, which is introduced into the valve body under very high pressure, leads to a deformation of the pressure chamber and thus to a bulging of the valve body.
- Valve member and valve body are reduced in the area of the guide. This can lead to increased wear and thus to a shorter service life of the fuel injector.
- the valve seat which is substantially conical, tilts as a result of
- the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that the strength of the valve body is increased so that the deformation of the valve body, which is caused by the pressure in the pressure chamber, is reduced.
- the valve body is surrounded in the area between the guided section of the valve member and the valve seat by a sleeve which has anisotropic strength properties.
- This increases the tangential stiffness of the valve body and thus avoids the disadvantages that arise from deformation of the valve body due to the high fuel pressure in the pressure chamber.
- the sleeve it has a greater tensile strength in the tangential direction with respect to the longitudinal axis of the bore in the valve body than in the longitudinal direction. Since the deformation of the valve body under pressure mainly takes place in the radial direction, a reinforcement of the valve body in the tangential direction is sufficient to produce the desired rigidity.
- the sleeve has a greater modulus of elasticity in the tangential direction than the steel from which the valve body is made.
- the sleeve contains fibers, at least some of which run at least approximately in the tangential direction.
- Composites of this type, which contain fibers, can be produced in a direction-dependent manner in terms of their strength properties, so that their strength properties can be adjusted over a wide range.
- the fibers are designed as carbon fibers.
- Such carbon fibers are extremely tear-resistant in their longitudinal direction and have a high modulus of elasticity, so that moduli of elasticity and tensile strengths can be achieved which are significantly higher than those of steel.
- the carbon fibers are embedded in a matrix made of epoxy resin.
- epoxy resin is in this case to a thermoset, so that under Tempe j raturein Eck no flow of the material takes place.
- the carbon fibers are embedded in a graphite matrix.
- a carbon fiber-graphite composite has the advantage that it remains stable up to high temperatures of 200 ° C to 300 ° C and is therefore suitable for use on a fuel injector without restriction.
- the carbon fibers are embedded in a matrix made of metal, which is preferably aluminum.
- metal which is preferably aluminum.
- Such composites of carbon fibers and metal have an even better temperature resistance and are also suitable for the highest thermal loads in internal combustion engines.
- FIG. 1 shows a longitudinal section through a fuel injection valve
- - Figure 2 is a view of the sleeve with the drawn course of the fibers
- Figure 3 shows another embodiment of the sleeve with a different arrangement of the fibers.
- FIG. 1 a longitudinal section through an inventive fuel injection valve is shown in its essential area.
- the fuel injection valve has a valve body 1 with a bore 3 which, at its end on the combustion chamber side, into an essentially conical valve seat 17 passes.
- a valve member 5 is arranged to be longitudinally displaceable, the valve member 5 being piston-shaped and being guided in a guide section 103 of the bore 3 facing away from the combustion chamber.
- the valve member 5 tapers from the guide section 103 to the combustion chamber to form a pressure shoulder 12 and merges at its end on the combustion chamber side into an essentially conical valve sealing surface 15 which cooperates with the valve seat 17.
- a radial expansion of the bore 3 forms a pressure chamber 10 at the level of the pressure shoulder 12, which continues as an annular channel surrounding the valve member 5 as far as the valve seat 17.
- the pressure chamber 10 can be filled with fuel under high pressure via an inlet bore 7 which is formed in the valve body 1.
- the valve member 5 is acted upon by a device (not shown in the drawing) with a closing force F, which acts on the end of the valve member 5 facing away from the combustion chamber and is directed towards the valve seat 17. In Figure 1, this force F is illustrated with an arrow.
- the introduced fuel which comes into the pressure chamber 10 and is under high pressure, results in a hydraulic opening force on the pressure shoulder 12 and on parts of the valve sealing surface 15 of the valve member 5, the hydraulic opening force being opposed to the closing force F.
- the closing force F is constant in the fuel injection valve, fuel is injected into the combustion chamber of the internal combustion engine when the fuel pressure in the pressure chamber 10 has risen to such an extent that the hydraulic opening force on the valve member 5 outweighs the closing force F.
- the valve member 5 is then moved in the longitudinal direction, lifts with the valve sealing surface 15 from the valve seat 17 and thus releases the injection opening 20.
- An interruption in the fuel supply to the pressure chamber 10 takes place there the pressure correspondingly decreases again until the closing force F prevails again and the valve member 5 moves back in the longitudinal direction into the closed position.
- the valve body 1 is essentially rotationally symmetrical on its outside.
- the valve body 1 has a relatively large outside diameter in order to enable stable guidance of the valve member 5 and the formation of the inlet channel 7.
- the valve body 1 tapers towards the combustion chamber in its outer diameter and merges into a significantly smaller valve body shaft 101 in the region of the pressure chamber 10.
- a sleeve 22 is arranged, which rests non-positively on the valve body shaft 101.
- the sleeve 22 is made of a different material than the valve body 1, which is made of steel.
- the sleeve 22 has anisotropic strength properties, so that in the region of the valve body stem 101 there is greater rigidity in the tangential direction than is possible with a valve body stem 101 made of steel.
- the valve body 1 Due to the high pressure in the pressure chamber 10, which can be 100 to 200 MPa in modern fuel injection systems, such as are used for self-igniting internal combustion engines, the valve body 1, in particular in the region of the valve body shaft 101, is expanded by the fuel pressure. This bulge of the valve body 1 has a negative influence on the properties of the fuel injection valve. On the one hand, the bulge results in a deformation of the valve body 1 in the region of the valve body shaft 101, which essentially represents a radial widening of the bore 3.
- valve body 1 also deforms in the region of the guide section 103, so that the guidance of the valve member 5 in the guide section 103 of the bore 3 changes, which leads to increased wear and tear can lead to a reduction in the service life of the fuel injector.
- the structure of the valve body shaft 101 leads to a change in the valve seat 17.
- the valve seat 17, like the valve sealing surface 15, is essentially conical. Due to the bulging of the valve body 1 in the area of the valve body stem 101, the valve seat 17 is tilted slightly outwards, so that the contact line of the valve sealing surface 15 on the valve seat 17 shifts somewhat. Since the opening pressure of the fuel injection valve depends on the size of the pressurized area on the valve seat 15, the opening pressure also changes as a result, which makes precise injection of the fuel at the desired time difficult.
- the sleeve 22 is preferably designed as a composite material in which fibers which have a high modulus of elasticity and a high tensile strength are embedded in a matrix.
- Figure 2 shows a sleeve 22 with the course of fibers 24 in the matrix.
- a possible combination of fibers 24 and matrix consists of forming the fibers 24 as carbon fibers and using a matrix made of epoxy resin.
- the carbon fibers coated with epoxy resin are wound onto the valve body 101 on the finished fuel injection valve and the epoxy resin polymerizes there by means of a suitable treatment. This results in a secure connection of the sleeve 22 to the valve body stem 101 without the need for further adhesives or similar connecting materials.
- the sleeve 22 Due to the carbon fibers 24, the sleeve 22 has a very high modulus of elasticity and a high tensile strength in the tangential direction.
- the modulus of elasticity of such a composite can be significantly higher than that of steel.
- no fibers run in the longitudinal direction of the sleeve 22, so that the modulus of elasticity and also the tensile strength in the longitudinal direction, that is to say along the longitudinal axis 14, is approximately a factor 100 smaller than in the tangential direction.
- valve body shaft 101 Since in a valve body 1 with a reinforcing sleeve 22 the valve body shaft 101 is made thinner than in a conventional fuel injection valve, the valve body shaft 101 also has low rigidity in the longitudinal direction. Due to the small modulus of elasticity of the sleeve 22 in the longitudinal direction, there is low rigidity in the entire region of the valve body shaft 101 in the longitudinal direction. This leads to a further advantage of the fuel injection valve, since the valve member 5 is hard on the valve sealing surface 15 on the valve seat 17 during the closing movement and is braked there in the shortest possible way.
- the ratio of tangential rigidity to rigidity in the longitudinal direction of the sleeve 22 can be set very precisely and, depending on the angle ⁇ and the number of fibers, the desired rigidity is obtained.
- a typical angle ⁇ for such compounds is 5 ° to 30 °, preferably 10 °.
- other combinations of fibers and matrix material are also possible.
- carbon fibers can also be embedded in a matrix of graphite, which has the advantage that the composite of graphite and carbon fibers withstands significantly higher temperatures than an epoxy resin-carbon fiber composite.
- Graphite withstands temperatures of 200 ° C to 300 ° C, so that this combination is particularly suitable for use on fuel injection valves that are exposed to the heat of combustion in the combustion chamber of the internal combustion engine.
- Aluminum or other low-melting metals, in which carbon fibers can be integrated, are suitable for this.
- Such sleeves with a metal or graphite matrix are preferably manufactured separately from the valve body 1 and then shrunk onto the valve body 1 in order to achieve a non-positive connection between the sleeve 22 and the valve body 1.
- various other fibers can also be used, for example polymer fibers such as aramid or glass fibers. Which type of fiber is used in combination with which matrix material is measured in accordance with the use of the fuel injection valve, the temperatures which occur and the pressures to be expected and thus the mechanical loads in the shaft region 101 of the fuel injection valve.
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 |
---|---|---|---|
DE10125943 | 2001-05-29 | ||
DE10125943A DE10125943A1 (de) | 2001-05-29 | 2001-05-29 | Kraftstoffeinspritzventil für Brennkraftmaschinen |
PCT/DE2002/001080 WO2002097261A1 (de) | 2001-05-29 | 2002-03-23 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1395747A1 true EP1395747A1 (de) | 2004-03-10 |
EP1395747B1 EP1395747B1 (de) | 2004-12-22 |
Family
ID=7686394
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02727264A Expired - Lifetime EP1395747B1 (de) | 2001-05-29 | 2002-03-23 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Country Status (5)
Country | Link |
---|---|
US (1) | US6832600B2 (de) |
EP (1) | EP1395747B1 (de) |
JP (1) | JP2004519623A (de) |
DE (2) | DE10125943A1 (de) |
WO (1) | WO2002097261A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060054522A1 (en) * | 2004-09-14 | 2006-03-16 | The Coca-Cola Company | Carton with article opening |
BRPI0516982A (pt) * | 2004-10-20 | 2008-09-30 | Coca Cola Co | caixa para embalagem para conter um número de artigos |
US20060108406A1 (en) * | 2004-11-22 | 2006-05-25 | The Coca-Cola Company | Carton with article opening |
FR2878581B1 (fr) * | 2004-11-29 | 2009-05-29 | Renault Sas | Procede d'assemblage d'un injecteur et partie de moteur comportant un injecteur |
DE102008040108B9 (de) | 2008-07-03 | 2023-09-07 | Robert Bosch Gmbh | Ventil, insbesondere Einspritz- oder Dosierventil in Kraftstoffeinspritz- oder Abgasanlagen von Brennkraftmaschinen |
DE102009002518A1 (de) * | 2009-04-21 | 2010-10-28 | Robert Bosch Gmbh | Hochdruckpumpe |
GB0908690D0 (en) * | 2009-05-20 | 2009-07-01 | Delphi Tech Inc | Mounting system for an exhaust system |
DE102009046652A1 (de) | 2009-11-12 | 2011-05-19 | Robert Bosch Gmbh | Kraftstoffinjektor |
DE102012219654A1 (de) | 2012-10-26 | 2014-04-30 | Robert Bosch Gmbh | Kraftstoffinjektor |
DE102013212321A1 (de) | 2013-06-26 | 2014-12-31 | Robert Bosch Gmbh | Kraftstoffinjektor |
DE102020215411A1 (de) * | 2020-12-07 | 2022-06-09 | Robert Bosch Gesellschaft mit beschränkter Haftung | Kolbenpumpe, insbesondere Kraftstoff-Hochdruckpumpe für eine Brennkraftmaschine |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2149817B2 (de) * | 1971-10-06 | 1975-08-21 | Daimler-Benz Ag, 7000 Stuttgart | Anordnung eines Kraftstoffeinspritzventils zur elektronisch gesteuerten Benzineinspritzung in den Ansaugkanal einer Brennkraftmaschine |
DE3012416A1 (de) * | 1980-03-29 | 1981-10-15 | Robert Bosch Gmbh, 7000 Stuttgart | Einspritzventil |
US4773374A (en) * | 1985-10-03 | 1988-09-27 | Nippondenso Co., Ltd. | Fuel injection system for internal combustion engine |
US6378562B1 (en) * | 1992-04-14 | 2002-04-30 | Itt Industries, Inc. | Multi-layer tubing having electrostatic dissipation for handling hydrocarbon fluids |
DE4409848A1 (de) * | 1994-03-22 | 1995-10-19 | Siemens Ag | Vorrichtung zur Zumessung und Zerstäubung von Fluiden |
DE19618650B4 (de) | 1996-05-09 | 2006-04-27 | Robert Bosch Gmbh | Verfahren zur Herstellung eines Kraftstoffeinspritzventils für Brennkraftmaschinen |
DE19748999C2 (de) * | 1997-11-06 | 2002-11-07 | Daimler Chrysler Ag | Magnetventilgesteuerter Injektor für ein Speichersystem einer mehrzylindrigen Brennkraftmaschine |
US6183212B1 (en) * | 1999-02-17 | 2001-02-06 | Stanadyne Automotive Corp. | Snap-in connection for pumping plunger sliding shoes |
JP3827307B2 (ja) * | 2000-07-21 | 2006-09-27 | シーメンス ヴィディーオー オートモーティヴ コーポレイション | テルビウム系希土類磁歪合金の温度特性の金属学的及び機械的補償 |
-
2001
- 2001-05-29 DE DE10125943A patent/DE10125943A1/de not_active Withdrawn
-
2002
- 2002-03-23 US US10/333,714 patent/US6832600B2/en not_active Expired - Fee Related
- 2002-03-23 WO PCT/DE2002/001080 patent/WO2002097261A1/de active IP Right Grant
- 2002-03-23 EP EP02727264A patent/EP1395747B1/de not_active Expired - Lifetime
- 2002-03-23 DE DE50201843T patent/DE50201843D1/de not_active Expired - Fee Related
- 2002-03-23 JP JP2003500408A patent/JP2004519623A/ja not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO02097261A1 * |
Also Published As
Publication number | Publication date |
---|---|
US6832600B2 (en) | 2004-12-21 |
DE10125943A1 (de) | 2002-12-05 |
EP1395747B1 (de) | 2004-12-22 |
JP2004519623A (ja) | 2004-07-02 |
WO2002097261A1 (de) | 2002-12-05 |
DE50201843D1 (de) | 2005-01-27 |
US20040050972A1 (en) | 2004-03-18 |
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