EP2336547B1 - Einspritzventil mit Vorrichtung zur Überprüfung der Zylinderkopfdichtung - Google Patents

Einspritzventil mit Vorrichtung zur Überprüfung der Zylinderkopfdichtung Download PDF

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Publication number
EP2336547B1
EP2336547B1 EP20100189171 EP10189171A EP2336547B1 EP 2336547 B1 EP2336547 B1 EP 2336547B1 EP 20100189171 EP20100189171 EP 20100189171 EP 10189171 A EP10189171 A EP 10189171A EP 2336547 B1 EP2336547 B1 EP 2336547B1
Authority
EP
European Patent Office
Prior art keywords
plastic body
housing
cylinder head
valve
injection valve
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.)
Not-in-force
Application number
EP20100189171
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2336547A1 (de
Inventor
Thomas Sebastian
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
Publication of EP2336547A1 publication Critical patent/EP2336547A1/de
Application granted granted Critical
Publication of EP2336547B1 publication Critical patent/EP2336547B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means

Definitions

  • the invention relates to an injection valve for installation in a receiving shaft in the cylinder head of an internal combustion engine according to the preamble of claim 1.
  • a well-known injection valve for fuel also called injector ( DE 10 2007 028 490 A1 ), has a valve housing with a arranged at one end of the housing valve group and arranged at the other end of the housing fuel inlet.
  • the valve group comprises a valve needle, which cooperates with a valve seat surrounding a spray opening, and a valve closing spring, which presses the valve needle onto the valve seat.
  • piezoelectric actuator which is electrically connected to plug contacts of a connectable with a mating connector plug.
  • a connector housing enclosing the plug contacts of the connector plug is formed in a plastic body, which is sprayed onto the fuel inlet end of the valve housing and also encloses the fuel inlet.
  • Such a fuel injection valve is installed for direct fuel injection in a central receiving shaft in the cylinder head of the internal combustion engine, which is placed between the drives for the gas exchange valves.
  • the elastic Sealing flange which presses against the shaft wall, seals the receiving shaft against dirt and spray to prevent damage to fuel injector and engine.
  • the sealing flange is arranged on the injection valve so that it is placed after installation of the injector above the so-called. Cylinder head division at which a cylinder head cover is tightened by a seal on a cylinder head body. Coolant channels for the cylinder head extend beyond the cylinder head spacing and are composed of sub-channels formed in the base body and in the cover.
  • the injector according to the invention with the features of claim 1 has the advantage that forms from the end of the plastic body, which faces away from the fuel inlet to at least the connector housing extending smooth surface of the interface between the valve body and plastic body below the sealing flange forms a leakage path, the after installation of the injector in the receiving shaft in the cylinder head establishes a connection between the receiving shaft and the interior of the connector housing.
  • the tightness of the cylinder head more precisely, the tightness of the interface between the cylinder head body and cylinder head cover, are tested in the engine mounting on the sealing flange over the connector housing.
  • a poor seal quality of the seal between the cylinder head body and the cylinder head cover can be detected by appropriate measurement of accumulating in the connector housing test air. After attaching the mating connector to the connector housing this is protected against ingress of moisture, so that no moisture can penetrate into the shaft on the existing also during operation leak path.
  • the fuel feed continues into an inlet nozzle inserted into the valve housing and the inlet nozzle is enclosed by the plastic body over part of its axial extent.
  • a plurality of parallel annular grooves are incorporated, which are filled by the plastic material of the plastic body after its encapsulation.
  • Partial injection valve 10 shown in longitudinal section is used for the direct injection of fuel into the combustion chamber 11 of a combustion cylinder of an internal combustion engine or an internal combustion engine, which is bounded by a reciprocating piston axially displaceably guided in the combustion cylinder and a cylinder head 12.
  • the cylinder head 12 is divided into a cylinder head body 121 and a cylinder head cover 122. The latter is clamped with the interposition of a seal 13 on the cylinder head body 121.
  • each cooling oil channel 14th is composed of a formed in the cylinder head body 121 channel part and a molded into the cylinder head cover 122 channel part.
  • a receiving shaft 15 is formed for an injection valve 10.
  • the injection valve 10 has a valve housing 16 which has an injection opening 17 at one end face and a fuel inlet 18 at its other end face.
  • the valve housing 16 is composed of a housing sleeve 19 and a the fuel inlet 18 facing the end of the housing sleeve 19 occlusive connector 20 (FIGS. FIG. 2 ) together.
  • the connector 20 is partially inserted into the housing sleeve 19 and fixedly connected to this, for example via a weld 21.
  • a valve group is arranged, which comprises a partially inserted into the housing sleeve 19, the ejection opening 17 having nozzle body 22, a discharge opening 17 controlling valve needle 23 and a valve needle 23 in the valve closed position retaining return spring 24.
  • the outwardly opening valve needle 23 is actuated by means disposed in the housing sleeve 19 between the connecting piece 20 and the valve group actuator 25 against the closing force of the return spring 24.
  • the actuator 25 is formed in the embodiment as a piezoelectric actuator whose electrical connections are connected to plug contacts 26 of a connector plug 27. Piezoelectric actuators are known and, for example, in the DE 103 19 599 A1 described.
  • the fuel inlet 18 formed in the connecting piece 20 is preceded by an inlet nozzle 28, onto which a fuel feed line can be plugged.
  • the inlet nozzle 28 is inserted end into the connecting piece 20 and fixedly connected to this, for example by welding.
  • a plastic body 29 is sprayed, the end covers the housing sleeve 19 extends over the protruding from the housing sleeve 19 part of the connector 20 and the inlet nozzle 28 encloses part of its axial length.
  • a connector housing 26 surrounding the connector housing 30 is formed during spraying, which is designed for attaching a plug connector 26, not shown, mating connector, which in turn can be pushed onto the connector housing 30 and latched thereto.
  • an elastic sealing flange 31 is arranged, which serves to seal the receiving shaft 15 after installation of the injection valve 10 in the cylinder head 12, like this FIG. 1 is apparent.
  • the in FIG. 3 shown sealing flange 31 has an annular body 311 and one of which integrally projecting, circumferential sealing bead 312 with finger-like cross section.
  • an annular groove 32 is formed, in which the annular body 311 of the sealing flange 31 rests.
  • the annular body 311 can be pressed into the annular groove 32 and / or glued.
  • the sealing bead 312 presses after installation of the injection valve 10 in the receiving shaft 15 in the cylinder head 12 to the shaft wall 151 of the receiving shaft 15 and seals the receiving shaft 15 hermetically.
  • the region of the valve housing 16 extending from the extending from the fluid inlet end of the plastic body 29 extends at least to the connector housing 30, a smooth outer surface without circumferential grooves, circumferential grooves or other circumferential recesses in which plastic material can settle on.
  • This smooth outer surface causes after the plastic extrusion for the production of the plastic body 29 between the plastic body 29 and this smooth surface portion of the valve housing 16, here the surface of the end portion of the housing sleeve 19 and of this projecting portion of the fitting 20, a leakage path is present.
  • the mating connector is plugged onto the connector housing 30 and thus the connector housing 30 is sealed against the ingress of moisture and dirt, so that no moisture can penetrate into the receiving shaft 15 via the leakage path from the connector housing 30 to the receiving shaft 15.
  • the inlet nozzle 28 is provided with a plurality of parallel grooves 33 which extend over the circumference of the inlet nozzle 28 and 29 are filled with plastic material during spraying of the plastic body. This creates a kind of toothing between the plastic body 29 and the inlet nozzle 28, which reliably prevents passage of moisture.

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)
EP20100189171 2009-12-21 2010-10-28 Einspritzventil mit Vorrichtung zur Überprüfung der Zylinderkopfdichtung Not-in-force EP2336547B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910055087 DE102009055087A1 (de) 2009-12-21 2009-12-21 Einspritzventil

Publications (2)

Publication Number Publication Date
EP2336547A1 EP2336547A1 (de) 2011-06-22
EP2336547B1 true EP2336547B1 (de) 2013-03-06

Family

ID=43734267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100189171 Not-in-force EP2336547B1 (de) 2009-12-21 2010-10-28 Einspritzventil mit Vorrichtung zur Überprüfung der Zylinderkopfdichtung

Country Status (3)

Country Link
EP (1) EP2336547B1 (zh)
CN (2) CN104018970A (zh)
DE (1) DE102009055087A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011087702A1 (de) 2011-12-05 2013-06-06 Robert Bosch Gmbh Kraftstoffinjektor und Kraftstoffeinspritzsystem
DE102012204302A1 (de) * 2012-03-19 2013-09-19 Robert Bosch Gmbh Umspritztes Bauelement mit einem Dichtlabyrinth
DE102013205309A1 (de) 2013-03-26 2014-10-02 Robert Bosch Gmbh Vorrichtung zum Zumessen von Fluid

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5372313A (en) * 1993-02-16 1994-12-13 Siemens Automotive L.P. Fuel injector
DE19624611A1 (de) * 1996-06-20 1998-01-02 Freudenberg Carl Fa Vorrichtung zur Abdichtung eines Ringspalts zwischen einem Gehäuse und einer Welle
DE10319599A1 (de) 2003-05-02 2004-11-18 Robert Bosch Gmbh Aktoreinheit für ein piezogesteuertes Kraftstoffeinspritzventil
DE10345965A1 (de) * 2003-10-02 2005-07-07 Parker Hannifin Gmbh Brennstoffeinspritzventil
JP2006057620A (ja) * 2004-07-20 2006-03-02 Aisan Ind Co Ltd 燃料噴射弁及び燃料噴射弁のシール方法
DE102004058803A1 (de) * 2004-12-07 2006-06-08 Robert Bosch Gmbh Einspritzventil
DE102007028490A1 (de) 2007-06-21 2008-12-24 Robert Bosch Gmbh Koppler zur Hubübertragung mittels Scherkraft, Injektor, sowie Verfahren zur Hubübertragung

Also Published As

Publication number Publication date
CN104018970A (zh) 2014-09-03
EP2336547A1 (de) 2011-06-22
DE102009055087A1 (de) 2011-06-22
CN102102613A (zh) 2011-06-22

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