DE102009046377A1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
DE102009046377A1
DE102009046377A1 DE200910046377 DE102009046377A DE102009046377A1 DE 102009046377 A1 DE102009046377 A1 DE 102009046377A1 DE 200910046377 DE200910046377 DE 200910046377 DE 102009046377 A DE102009046377 A DE 102009046377A DE 102009046377 A1 DE102009046377 A1 DE 102009046377A1
Authority
DE
Germany
Prior art keywords
coating
fuel injection
injection valve
valve
fuel
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.)
Withdrawn
Application number
DE200910046377
Other languages
German (de)
Inventor
Andreas Ellenschlaeger
Ulrike Mock
Ingo Zeitler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE200910046377 priority Critical patent/DE102009046377A1/en
Publication of DE102009046377A1 publication Critical patent/DE102009046377A1/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/166Selection of particular materials
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603Injectors peculiar thereto with means directly operating the valve needle using piezo-electric or magnetostrictive operating means

Abstract

In a fuel injection valve (10) for an injection system of an internal combustion engine, with an injection nozzle (14), which has a nozzle tip (26) with at least one nozzle outlet (28) for the fuel, according to the invention at least one is arranged upstream of the nozzle tip (26) and has it the fuel-contacting surface (48) of a valve component at least partially has a coating (46) which counteracts adherence of biofuel and / or biofuel components, in particular biodiesel and resinous aging polymers.

Description

  • The invention relates to a fuel injection valve for an injection system of an internal combustion engine according to the preamble of claim 1.
  • Such fuel injection valves are for example from the German patents DE 10 2005 019 328 A1 such as DE 10 2005 038 385 A1 known. The fuel injection valves shown there have a coating in the region of their nozzle opening or the nozzle tip, which is intended to counteract the adhesion of combustion residues.
  • The increasing use of biofuels, such as biodiesel, z. B. as an admixture with fossil diesel fuels, however, can lead to deposits in these fuel injection valves, which can clog fuel passages within the fuel injection valves and fix movably mounted valve components, which can result in failure of the fuel injection valve and thus the entire drive system.
  • These deposits are formed in contrast to the resulting under high combustion temperatures coking in the nozzle tip at much lower operating temperatures or even outside an operation of the fuel injection valve or the internal combustion engine. As a result, the deposits have a broader chemical spectrum of, in particular, resinous polymeric compounds, fatty acids and / or their metal soaps and the like, which can also bind minute particles (contaminants) in the fuel compared to incomplete combustion incineration.
  • The object of the invention is to improve a generic fuel injection valve with the least possible manufacturing effort such that this has a further improved reliability when using biofuels or an increased admixture of biofuels.
  • Advantages of the invention
  • The object is achieved by a fuel injection valve with the features specified in claim 1.
  • Essentially, the advantage associated with the fuel injector of the present invention is that the risk of malfunction of the fuel injector when using biofuels or fuels having an increased biofuel content is reduced in a simple and reliable manner. Deposits which are found, for example, in biodiesel or offset fossil fuel or can form from the biofuel often have resinous polymeric compounds and consequently do not adhere or only to a reduced extent to the surface of the valve component coated according to the invention. These deposits can therefore be easily replaced by a given during operation fuel flow or operational vibration or friction of the coated surface. The coating is not only a barrier to deposits produced by biodiesel, but generally to coverings made by renewable fuel.
  • With regard to the risk of a malfunction caused by deposits malfunction stored valve components is provided according to the invention that the at least partially coated surface of the valve component serves as a bearing surface of the valve component. The valve component can be, for example, a coupling element, as can be found in hydraulic or piezoelectric couplers, which serve to translate a Aktorhubs and compensate for any existing game between the actuator and a control or servo valve. The main feature of the hydraulic coupler is to compensate for the negative temperature expansion of the piezo ceramic. According to the invention, the bearing surface assigned to the coupling element may also have the coating.
  • The coating has a structured surface according to an embodiment of the invention. As a result, on the one hand, a particularly effective anti-adhesion property of the coating can be realized. On the other hand, the structured surface allows a particularly low sliding friction resistance of the coating, which is particularly favorable for storage areas.
  • In view of the high dimensional accuracy of the components required for reliable operation of a fuel injection valve, the coating preferably has a thickness of between 200 nanometers and 50 micrometers.
  • The coating is preferably oriented to a temperature range to which the valve components located upstream of the nozzle tip are exposed during operation. The coating therefore preferably only needs to have a temperature resistance of up to 350 ° C, preferably of only up to 300 ° C, which is favorable from a cost point of view.
  • The non-stick effect of the coating is according to a development of the invention preferably directed to methyl esters, glycerol, fats and / or fatty oils, reaction products of detergents and fatty acids. This reliably prevents the adhesion of components found in biofuels, such as biodiesel or vegetable oils.
  • The coating can be applied in particular by means of a chemical or a physical vapor deposition. Alternatively, however, the coating may also be a polymer, in particular a hybrid polymer obtained by way of the sol-gel process, wherein the coating may be applied to the surface of the respective valve component in the wet-chemical process, preferably by dipping, spraying, knife coating or spin coating , As possible starting components of the sol-gel process, it is possible to use various silicon alkoxides, for example tetraethoxysilane (TEOS), as well as their modifications by replacing one or more alkoxide groups with organic molecules. Special precursors bearing as side chains perfluorinated alkanes and / or other hydrophobic organic chains are suitable in view of the desired anti-adhesion effect of the coating. Likewise, SI precursors can be used, which are already precrosslinked via (perfluorinated) carbon chains. Instead of Etoxisilane other alcohols, such as methanol, propanol, butanol and / or diols, such as glycol, propanediol, or triols, such as glycerol, come for esterification in question.
  • For a high durability, the coating preferably has at least one nanoscale filler, in particular aluminum, titanium or zirconium oxide, hexagonal boron nitride or organic nanoparticles, at least in its surface region.
  • drawings
  • The invention will be explained in more detail with reference to an exemplary embodiment shown in the drawing by way of example. Show it:
  • 1 a highly schematic longitudinal section of a fuel injection valve according to the invention; and
  • 2 an enlarged longitudinal section of a in the 1 with "A" designated section of a to the 1 similar fuel injection valve.
  • Description of the embodiment
  • In the 1 is a total with 10 designated fuel injection valve for an injection system of an internal combustion engine shown. The fuel injector 10 has a valve body 12 and one in the valve body 12 integrated injection nozzle 14 on.
  • The fuel injector 10 indicates his in 1 top side shown above 16 a high pressure connection 18 for Biodiesel added or consisting of biodiesel fuel on with a with 20 designated inlet channel to the injection nozzle 14 and via an inlet throttle not shown in detail in the invention in a valve control room 22 is guided. The valve control room 22 serves in a conventional manner a control of a valve needle 24 ie opening and closing two in a nozzle 26 the injector 14 arranged nozzle outlet 28 ,
  • The valve control room 22 is via a control valve 30 caused by a piezoelectrically excitable actuator 32 can be opened, with a fuel return 34 connected. The piezoelectrically excitable actuator 32 is via a first coupler formed as a hydraulic coupler piston 36 and a first coupling element 36 downstream and formed as a valve piston second Kopplungslement 38 with the control valve 30 connected. The two coupling elements 36 . 38 are upstream of the nozzle tip 26 in a coupler body 40 arranged translationally displaceable and after commissioning of the fuel injection valve 10 permanently lapped by fuel or wetted by this.
  • As in particular from the 2 shows, is the first coupling element 36 with a first storage area 42 at a corresponding second storage area 44 of the coupler body 40 guided in Gleitspiel positive connection. The first coupling element 36 according to the invention has a total of a coating 46 provided surface 48 on, which in particular also from the surface 48 formed first storage area 42 with the coating 46 is provided. The coating 46 prevents the adherence of biofuel and / or biofuel constituents, in particular of biodiesel and resinous polymers, which occur in the biodiesel after an aging process and the reduction of fuel stability.
  • Alternatively or additionally, that of the coupler body 40 formed second storage area 44 for the first coupling element 36 with a coating 46 be provided.
  • According to a not further shown in the drawing further embodiment of the invention may also also the second coupling element 38 or the assigned storage area 44 of the coupler body 40 in to above explained Embodiment corresponding manner have a coating.
  • The thickness of the coating 46 in the embodiment shown here is 50 nanometers, but may also have a different value between 200 nanometers and 50 microns.
  • The coating 46 of the first coupling element 36 needs, since the first coupling element 36 In operation, it is subjected to significantly lower temperatures than, for example, the nozzle tip 26 the injector 14 to have only a temperature resistance of about 300 ° C. The coating 46 is in the present case as a hybrid polymer layer with zirconium oxide as nanoscale filler, waxes and other polymeric components, prepared in the sol-gel process and subsequently wet-chemically on the first coupler element 36 applied.
  • According to an alternative embodiment, the coating 46 also comprise a plastic, in particular polytetrafluoroethylene (PTFE) or perfluoroalkoxy (PFA) polymer or be formed from this.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • DE 102005019328 A1 [0002]
    • DE 102005038385 A1 [0002]

Claims (10)

  1. Fuel Injector ( 10 ) for an injection system of an internal combustion engine, with an injection nozzle ( 14 ), which has a nozzle tip ( 26 ) with at least one nozzle outlet ( 28 ) for the fuel, characterized in that at least one upstream of the nozzle tip ( 26 ) and in contact with the fuel surface ( 48 ) a valve component at least partially a coating ( 46 ), which counteracts adhesion of biofuel and / or biofuel constituents, in particular of biodiesel and resinous aging polymers.
  2. Fuel injection valve according to claim 1, characterized in that the at least partially coated surface ( 48 ) the valve component a storage area ( 42 ; 44 ; 44 ' ) is the valve component.
  3. Fuel injection valve according to claim 1 or 2, characterized in that the valve component is a, preferably hydraulic, coupling element ( 36 ) which is an actuator ( 32 ) and a control valve ( 30 ) is interposed.
  4. Fuel injection valve according to one of the preceding claims, characterized in that the coating ( 46 ) has a textured surface.
  5. Fuel injection valve according to one of the preceding claims, characterized in that the thickness of the coating ( 46 ) is between 200 nanometers and 50 microns.
  6. Fuel injection valve according to one of the preceding claims, characterized in that the coating ( 46 ) has a temperature resistance of at most 350 ° C, preferably of at most 300 ° C, having.
  7. Fuel injection valve according to one of the preceding claims, characterized in that the non-stick effect of the coating ( 46 ) is oriented to deposits of metal soaps, aging polymers, methyl esters, glycerol, fats and / or fatty oils.
  8. Fuel injection valve according to one of the preceding claims, characterized in that the coating ( 46 ) has functional siloxanes and is applied in particular by means of a plasma process.
  9. Fuel injection valve according to one of claims 1 to 7, characterized in that the coating ( 46 ) Alcoholates and / or alkoxysilanes, which preferably comprise functional groups for an organic polymerization reaction, and in particular by means of a sol-gel process is prepared.
  10. Fuel injection valve according to one of the preceding claims, characterized in that the coating ( 46 ) has at least one nanoscale filler, preferably aluminum, titanium, zirconium oxide and / or hexagonal boron nitride and / or another organic filler.
DE200910046377 2009-11-04 2009-11-04 Fuel injection valve Withdrawn DE102009046377A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200910046377 DE102009046377A1 (en) 2009-11-04 2009-11-04 Fuel injection valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910046377 DE102009046377A1 (en) 2009-11-04 2009-11-04 Fuel injection valve
EP10183031.3A EP2320063A3 (en) 2009-11-04 2010-09-30 Fuel injection valve

Publications (1)

Publication Number Publication Date
DE102009046377A1 true DE102009046377A1 (en) 2011-05-26

Family

ID=43528346

Family Applications (1)

Application Number Title Priority Date Filing Date
DE200910046377 Withdrawn DE102009046377A1 (en) 2009-11-04 2009-11-04 Fuel injection valve

Country Status (2)

Country Link
EP (1) EP2320063A3 (en)
DE (1) DE102009046377A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018206350A1 (en) 2017-05-10 2018-11-15 Robert Bosch Gmbh Hydrophobically coated metal component and method for producing same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005019328A1 (en) 2005-04-26 2006-11-02 Robert Bosch Gmbh Fuel injection valve for internal-combustion engine, has volume between front surface of valve closing section and front surface, and coating with non-stick effect for combustion residues provided at front surfaces that limit volume
DE102005038385A1 (en) 2005-08-08 2007-02-22 Siemens Ag A fuel injector and method for increasing the resistance of such a nozzle against operational deterioration of the injection characteristics

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2376047B (en) * 2001-05-31 2005-03-30 Finch Ltd Fuel injection devices
JP5031824B2 (en) * 2006-05-03 2012-09-26 デルファイ・テクノロジーズ・ホールディング・エス.アー.エール.エル. Method for coating an actuator
US20090026292A1 (en) * 2007-07-27 2009-01-29 Caterpillar Inc. Coatings for use in fuel system components

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005019328A1 (en) 2005-04-26 2006-11-02 Robert Bosch Gmbh Fuel injection valve for internal-combustion engine, has volume between front surface of valve closing section and front surface, and coating with non-stick effect for combustion residues provided at front surfaces that limit volume
DE102005038385A1 (en) 2005-08-08 2007-02-22 Siemens Ag A fuel injector and method for increasing the resistance of such a nozzle against operational deterioration of the injection characteristics

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018206350A1 (en) 2017-05-10 2018-11-15 Robert Bosch Gmbh Hydrophobically coated metal component and method for producing same
DE102017207912A1 (en) * 2017-05-10 2018-11-15 Robert Bosch Gmbh Hydrophobically coated metallic component and method for its production
CN110582542A (en) * 2017-05-10 2019-12-17 罗伯特·博世有限公司 Hydrophobically coated metal part and method for producing same

Also Published As

Publication number Publication date
EP2320063A2 (en) 2011-05-11
EP2320063A3 (en) 2013-04-24

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