EP1757802A2 - Dispositif de carburant à haute pression - Google Patents

Dispositif de carburant à haute pression Download PDF

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Publication number
EP1757802A2
EP1757802A2 EP06117680A EP06117680A EP1757802A2 EP 1757802 A2 EP1757802 A2 EP 1757802A2 EP 06117680 A EP06117680 A EP 06117680A EP 06117680 A EP06117680 A EP 06117680A EP 1757802 A2 EP1757802 A2 EP 1757802A2
Authority
EP
European Patent Office
Prior art keywords
pressure
valve
pressure fuel
fuel device
housing
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Withdrawn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
EP06117680A
Other languages
German (de)
English (en)
Other versions
EP1757802A3 (fr
Inventor
Thomas Pauer
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 EP1757802A2 publication Critical patent/EP1757802A2/fr
Publication of EP1757802A3 publication Critical patent/EP1757802A3/fr
Withdrawn legal-status Critical Current

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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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from 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
    • 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
    • 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 high-pressure fuel device according to the closer defined in the preamble of claim 1. Art.
  • Such a high-pressure fuel device is known from DE 101 33 167 A1 known.
  • the high-pressure fuel device described therein consists of two high-pressure bodies, which are pressed against one another by means of a clamping nut on a contact surface. Furthermore, the high-pressure fuel device has a leakage oil space, which is formed radially outside the contact surface and is sealed by means of seals and has an outflow to a low-pressure region.
  • a high-pressure fuel device with a housing which comprises a first high-pressure body and a second high-pressure body, which have recesses formed in the axial direction for axially displaceable receiving a valve needle, abut one another on a contact surface and acted upon by means of a holding element against each other wherein a high-pressure space is provided within the housing for receiving fuel under high pressure, and wherein in a space region of the housing between the first and second Hochduck emotions and the holding element is provided a leakage oil space is.
  • the leakage oil chamber is sealed in an axial direction and in the wall region between the second high-pressure body and the holding element is a defined leak.
  • the formation of the leak by at least one fluid channel with preferably small free cross-section so that no costly measures are necessary for this takes place.
  • a fluid channel can be produced in a simple and cost-effective manner by mechanical or chemical material removal or laser processing.
  • a groove or perforation can be provided in the wall area to achieve a defined leak, it may be advantageous depending on the application, if a plurality of grooves or perforations is formed on the circumference of the wall region, as this may possibly better control the leakage.
  • FIGURE of the drawing shows a fuel high-pressure device according to the invention in the form of a fuel injection valve in longitudinal section.
  • the figure of the drawing shows a schematic representation of a high-pressure fuel device 1 according to the invention in the form of a fuel injection valve.
  • the high-pressure fuel device 1 has a housing 2 which comprises a first high-pressure body 3, which is designed as a valve holding body, and a second high-pressure body 4 designed as a valve body.
  • the two high-pressure bodies 3, 4, which abut against a common abutment surface 5, are at least partially encompassed by a holding element 6, which constitutes a clamping nut formed as a wall part, and act against one another in the area of the abutment surface 5.
  • the first high-pressure body or valve holding body 3 lies flat against the abutment surface 5 with its axial end facing the valve seat 13 against an axial end of the second high-pressure body or valve body 4 remote from the valve seat 13 and is supported by the holding element 6 forming a wall part pressed this.
  • a recess or bore 8 is formed, whose longitudinal axis coincides with the longitudinal axis of the clamping nut 6.
  • a piston-shaped valve needle 10 is arranged axially displaceably, which is sealingly guided in one of the valve tip or in the installed state facing away from the combustion chamber portion in the bore 8 and tapers toward the valve seat 13 to form a pressure shoulder 11.
  • valve needle 10 is in a preferably conical valve sealing surface 12, which cooperates with the combustion chamber end of the bore 8 formed on the housing 2 valve seat 13.
  • the valve seat 13 is also conical in the embodiment shown and has approximately the same cone opening angle as the valve sealing surface 12.
  • a plurality of injection openings 14 passing through the housing 2 are provided, which lead in the installed state of the high-pressure device 1 into a combustion chamber of an internal combustion engine.
  • a pressure chamber 15 in the manner of an annular space is formed in the valve body 4, which can be filled with fuel at high pressure via a feed channel 16 formed in the valve body 4 and the valve holding body 3.
  • the passing through the contact surface 5 of the two high-pressure body 3, 4 inlet channel 16 therefore forms a high-pressure chamber.
  • the substantially rotationally symmetrical and approximately oval in cross-section pressure chamber 15 is extended in the direction of the valve seat 13 and on the valve tip through a valve needle 10 gap-like surrounding annular channel 17, so that the pressure in the space 15 located fuel from the pressure chamber 15 to the valve seat thirteenth can flow.
  • valve sealing surface 12 abuts against the valve seat 13
  • injection openings 14 are closed and no fuel penetrates from the annular channel 17 to the injection openings 14.
  • the high-pressure device or fuel injection valve 1 is then closed, and no fuel is introduced into the combustion chamber of the internal combustion engine injected.
  • valve sealing surface 12 If the valve sealing surface 12 is lifted off the valve seat 13 by an axial movement of the valve needle 10, fuel can pass from the annular channel 17 through the gap formed between the valve sealing surface 12 and the valve seat 13 to the injection openings 14, and fuel is injected into the combustion chamber of the internal combustion engine ,
  • the valve body 4 is formed in an axial portion in which the valve needle 10 is guided in the valve body 4, with a cylindrical outer surface which tapers the valve tip inclined at approximately the level of the pressure chamber 15 to form a shoulder like a shoulder, the shoulder here is aligned in a plane perpendicular to the axis of the bore 8.
  • the clamping nut 6 which is designed substantially as a hollow cylinder with two stages and the valve seat facing away from the valve body 4 and the valve seat facing portion of the valve holding body 3 and thus the area of the contact surface 5 between these components 3, 4, corresponding to the geometry of the valve body 4 in its the valve tip end region also a Shoulder on which rests against the shoulder of the valve body 4.
  • the clamping nut 6 in its axial end region facing away from the valve tip, has an internal thread 20, which is designed so that it can be engaged in an external thread 21 formed on the outer circumferential surface of the valve holding body 3.
  • a leakage oil chamber 22 is further formed by means of a seal 23, which at the valve seat 13 remote from the end of the thread 20, 21 and thus between the clamping nut 6 and the valve holding body 3 is arranged, is sealed.
  • the radii of the two nested parts 4, 6 are dimensioned such that a fluid channel 26 is formed, can escape axially through the leakage oil in small quantities.
  • a channel or a groove may be formed so that leak oil can flow targeted at the valve tip side end of the clamping nut between the clamping nut and the valve member.
  • the fuel injection valve 1 In the arrangement of the fuel injection valve 1 at an opening of a combustion chamber of an internal combustion engine, the fuel can flow as a leak oil into the combustion chamber of the internal combustion engine and is there incinerated with the injected fuel. A flow of fuel into the combustion chamber takes place in particular at low combustion chamber pressures at the time of the charge cycle.
  • a seal 25 is provided at the valve tip facing the end of the housing 2, which seals the fuel injection valve 1 in the installed state against the housing of the internal combustion engine, so that the valve tip sealed into the combustion chamber protrudes.
  • the targeted leak between the clamping nut 6 and the valve body 4 can also be introduced through a mechanically machined channel or through a laser groove, whereby a targeted surface perforation can be used in an advantageous embodiment.

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)
EP06117680A 2005-08-26 2006-07-21 Dispositif de carburant à haute pression Withdrawn EP1757802A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510040366 DE102005040366A1 (de) 2005-08-26 2005-08-26 Kraftstoffhochdruckvorrichtung

Publications (2)

Publication Number Publication Date
EP1757802A2 true EP1757802A2 (fr) 2007-02-28
EP1757802A3 EP1757802A3 (fr) 2007-03-28

Family

ID=37398636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06117680A Withdrawn EP1757802A3 (fr) 2005-08-26 2006-07-21 Dispositif de carburant à haute pression

Country Status (2)

Country Link
EP (1) EP1757802A3 (fr)
DE (1) DE102005040366A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10133167A1 (de) 2001-07-07 2003-01-23 Bosch Gmbh Robert Kraftstoffhochdruckvorrichtung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB933020A (en) * 1961-03-14 1963-07-31 Bryce Berger Ltd Improvements in or relating to nozzle holders for fuel injection equipment of internal combustion engines
GB1210381A (en) * 1967-01-13 1970-10-28 Bryce Berger Ltd Liquid fuel injection nozzle units for internal combustion engines
US5443209A (en) * 1994-08-02 1995-08-22 Diesel Technology Company High pressure diesel fuel injector for internal combustion engines
LU90604B1 (en) * 2000-06-20 2001-12-21 Delphi Tech Inc Fuel injector
DE10121531A1 (de) * 2001-05-03 2002-11-14 Siemens Ag Kraftstoffinjektor
DE10209116A1 (de) * 2002-03-01 2003-09-18 Bosch Gmbh Robert Verfahren zur Herstellung eines Kraftstoffeinspritzventils

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10133167A1 (de) 2001-07-07 2003-01-23 Bosch Gmbh Robert Kraftstoffhochdruckvorrichtung

Also Published As

Publication number Publication date
DE102005040366A1 (de) 2007-03-01
EP1757802A3 (fr) 2007-03-28

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