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EP1362181A1 - Element d'etancheite place entre des elements d'un injecteur de carburant destine a un moteur a combustion interne - Google Patents

Element d'etancheite place entre des elements d'un injecteur de carburant destine a un moteur a combustion interne

Info

Publication number
EP1362181A1
EP1362181A1 EP02708204A EP02708204A EP1362181A1 EP 1362181 A1 EP1362181 A1 EP 1362181A1 EP 02708204 A EP02708204 A EP 02708204A EP 02708204 A EP02708204 A EP 02708204A EP 1362181 A1 EP1362181 A1 EP 1362181A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
stop element
sealing surface
recess
nozzle body
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
Application number
EP02708204A
Other languages
German (de)
English (en)
Other versions
EP1362181B1 (fr
Inventor
Klaus Rübling
Günter LEWENTZ
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1362181A1 publication Critical patent/EP1362181A1/fr
Application granted granted Critical
Publication of EP1362181B1 publication Critical patent/EP1362181B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • F02M61/04—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
    • 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
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure

Definitions

  • the invention relates to a fuel injection nozzle for an internal combustion engine according to the preamble of claim 1.
  • Such a fuel injection nozzle via which fuel is injected under high pressure into the combustion chamber of an internal combustion engine in injection systems, is known, for example, from EP-B-0 637 686.
  • This injection nozzle has a nozzle body and a nozzle holder, which are screwed to one another with the interposition of a stop disc by means of a nozzle clamping nut.
  • a nozzle needle In a guide bore of the nozzle body, a nozzle needle is guided so as to be displaceable in the axial direction and, in the idle state, seals spray openings arranged in a valve seat at the lower end of the guide bore.
  • the guide bore of the nozzle needle is further expanded at one point to form a pressure chamber, to which fuel at high pressure is supplied via an inlet bore.
  • Nozzle needle has a pressure shoulder in the area of the pressure chamber, which can be attacked by the fuel under high pressure.
  • a pressure bolt loaded by helical compression springs is arranged in a blind bore in the nozzle holder.
  • the pressure pin interacts with the nozzle needle via a bushing formed in the stop disk and presses it in the idle state with a preset holding force onto the valve seat in the nozzle body.
  • the nozzle needle lifts off the valve seat and moves axially in the direction of the stop disk until the end face of the nozzle needle strikes the stop disk and thus the maximum stroke of the nozzle needle and thus limits the injection quantity.
  • the abutting surfaces of the stop disk, the nozzle holder and the nozzle body are made exactly flat in order for one to provide a reliable seal against the fuel under a pressure of up to 1500 bar.
  • a fuel injection valve for a common rail fuel injection system with several injector modules is known, which are arranged axially one above the other and are axially braced against one another with a union nut.
  • the two contacting end faces of two superimposed injector modules form sealing faces.
  • the end face of an injector module for example a stop element, is provided with a recess of low planicity.
  • the object of the invention is to provide a fuel injection nozzle in which sealing surfaces on a stop element can be produced quickly and precisely.
  • a disk-shaped stop element which is arranged in a region between a nozzle body and a nozzle holder, has sealing surfaces on both sides, each with at least one recess.
  • the surface areas of the two sealing surfaces on the end faces of the stop element are each reduced, which on the one hand results in a surface pressure between a nozzle holder section and the first sealing surface opposite this, and on the other hand between a nozzle body section and the second sealing surface opposite this increases. Due to the smaller first and second sealing surfaces compared to an overall end face of the stop element, when the nozzle holder and the nozzle body are preloaded against one another, a high surface pressure and a high-pressure-tight connection result.
  • the respective recess in the first and the second sealing surface is punched, drilled and / or embossed according to the invention.
  • the manufacturing process for the recess can be carried out very quickly and therefore cost-effectively.
  • a recess in the stop element can be produced with high accuracy and any shape.
  • the recess runs continuously from the first to the second sealing surface through the disk-shaped stop element.
  • the recesses on both sides can be produced in a simple manner by punching or drilling the stop element. In contrast to, for example, a milled version of the recesses, the punching allows a more free design option Sealing surface geometry with low manufacturing costs.
  • the recess is recessed by a predetermined depth in each case in the first and the second sealing surface.
  • the recesses on the first and the second sealing surface can be provided, for example, by embossing on both sides. The embossing on both sides ensures that two sealing surfaces are machined in one step.
  • the recess has a round, oval or polygonal shape. Such contours can be produced quickly and precisely by means of punching.
  • the surface pressure exerted by the sealing surfaces on the opposite nozzle holder section or nozzle body section can be influenced in a targeted manner by a predetermined configuration of the shape of the recess.
  • the recess is provided on both sides in the edge area of the sealing surfaces of the stop element. As a result, the surface pressure in the inner region of the first and the second sealing surface is increased.
  • Fig. 1 shows a longitudinal section of a first embodiment of the fuel injector according to the invention
  • Fig. 2 is a plan view of a stop element
  • Fuel injector in a second embodiment shows a sectional view of the stop element from FIG.
  • Fig. 4 is a plan view of a stop element
  • FIG. 5 shows a sectional view of the stop element from FIG.
  • Fig. 6 is a plan view of a stop element
  • Fig. 7 is a sectional view of the stop element of Fig. 6 along the line VII-VII.
  • FIG. 1 shows a substantially rotationally symmetrical fuel injection nozzle in a first embodiment, in which a nozzle body 2 is firmly clamped to a nozzle holder 6 by a nozzle clamping nut 4.
  • a nozzle needle 10 is guided so as to be displaceable in the axial direction.
  • the nozzle needle 10 is provided at its front end with a substantially conical tip, which cooperates with a valve seat in the nozzle body 2, which has a plurality of injection openings, not shown.
  • the guide bore 8 is expanded in a central region to a pressure chamber 12 in which the nozzle needle 10 has a pressure shoulder 14.
  • the pressure chamber 12 is connected to a high-pressure inlet bore (not shown) formed in the nozzle body 2, via which fuel under high pressure is supplied to the pressure chamber 12.
  • the nozzle holder 6 has a second guide bore 9, the longitudinal axis of which is aligned with the longitudinal axis of the first guide bore 8 in the nozzle body 2. Furthermore, a high-pressure inlet bore, not shown, is formed in the wall of the nozzle holder 6, which connects to the high-pressure inlet bore in the nozzle body 2 in order to supply fuel.
  • a pressure pin 16 is provided axially displaceably, which with a Control, not shown, is in an operative connection which acts on the pressure pin 16 with a desired holding pressure.
  • a control can take place electromagnetically or piezoelectrically or can also be achieved by a spring device.
  • the pressure pin 16 acts on the nozzle needle 10 via an intermediate transmission body 18, the nozzle needle 10, the pressure pin 16 and the transmission body 18 being axially aligned in order to achieve good power transmission.
  • a spring chamber 20 is formed in the front area, in which a spring force adjusting disk 21 is arranged.
  • a helical spring 22 is supported at one end on the spring force adjusting disk 21. The other end of the coil spring 22 cooperates with an end face of the transmission body 18.
  • the helical spring 22 is designed such that it presses the nozzle needle 10 against the valve seat in the nozzle body 2 in the pressureless state via the transmission body 18 in the depressurized state, when there is no fuel pressure in the pressure chamber of the nozzle body 2, and thus prevents fuel injection.
  • a disc-shaped stop element 26 is inserted between opposing end faces of the nozzle holder 6 and the nozzle body 2.
  • the stop element 26 has a central passage 28 through which the transmission body 18 extends in sections as an operative connection between the pressure pin 16 and the nozzle needle 10.
  • the stop element 26 is ring-shaped and is attached via fixing bores 32 on the one hand to the nozzle holder 6 and on the other hand to the nozzle body 2.
  • the stop element 26 has a first, upper sealing surface 30, which bears against a nozzle holder section 23 on the end face of the nozzle holder 6, and a second, lower sealing surface 31, which bears against a nozzle body section 24 on the end face of the nozzle body 2.
  • the nozzle holder section 23 and the nozzle body section 24 each form sealing surfaces which also the sealing surfaces 30, 31 cooperate on the end faces of the stop element 26.
  • the nozzle clamping nut 4 which engages on a shoulder of the nozzle body 2 and presses the nozzle body 2 axially in the direction of the nozzle holder 6, causes the nozzle holder 6, the stop element 26 and the nozzle body 2 to be preloaded against one another and so to a high degree Surface pressure on their end faces.
  • the high-pressure inlet bores and the guide bores 8, 9 and the bushing 28 are securely sealed off from one another and from the outside.
  • the nozzle needle 10 has a stop 34 at its end opposite the transmission body 18. In the rest position, the nozzle needle 10 is seated on the valve seat due to the holding pressure acting on the transmission body 18 and the nozzle needle 10 via the pressure pin 16 and closes the injection openings, so that an injection into the internal combustion engine is prevented. If the fuel pressure present via the high-pressure inlet bores in the pressure chamber 12 of the first guide bore 8 and which acts on the pressure shoulder 14 on the nozzle needle 10 exceeds the holding pressure acting on the nozzle needle 10 via the pressure pin 16 and the transmission body 18, the nozzle needle 10 lifts off the valve seat and moves axially against the pressure pin 16 and the transmission body 18 until the stop 34 of the nozzle needle 10 strikes the stop element 26 and thus limits the maximum stroke of the nozzle needle 10. This maximum stroke essentially determines the amount of fuel injected via the injection openings. Through the stop element 26, which between the end face 23 of the nozzle holder 6 and the end face 24 of
  • Nozzle body 2 is arranged, the desired tolerances for the maximum stroke can be stopped in a simple manner.
  • the stop element 26 can be manufactured as a simple turned part, for example made of hardened steel, the end faces of the stop element 26 on both sides being designed as sealing surfaces 30, 31, each of which has at least one recess that cannot be seen in FIG. 1. Through the The area of the sealing surfaces 30, 31 is reduced and the sealing effect is increased.
  • FIG. 2 shows a top view of a stop element 26 of a fuel injection nozzle.
  • a plan view of the upper, first sealing surface 30 of the stop element 26 can be seen in FIG. 2.
  • the stop element 26 has in its center the bushing 28 for the transmission body, not shown in FIG. 2, which projects through the bushing 28 in the installed state.
  • two oval recesses 36 are provided in the disk-shaped stop element 26, which are arranged mirror-symmetrically on the sealing surface 30.
  • a third kidney-shaped recess 36 is formed in the sealing surface 30.
  • two fixing bores 32 are arranged distributed over the sealing surface 30.
  • a fuel supply hole 33 is made in the stop element 26.
  • FIG. 3 shows a sectional view of the stop element 26 according to FIG. 2 along the line III-III.
  • the recesses 36 in the first sealing surface 30 extend continuously from the first 30 to the second sealing surface 31 through the thickness of the stop element 26.
  • This continuous design of the recesses 36 can be achieved quickly and easily by punching out the material of the stop element 26.
  • a web 38 is provided between the recesses designed as punched-out areas and provides a stop surface for the stop 34 of the nozzle needle 10.
  • FIG. 4 shows a stop element 26 of a fuel injection nozzle according to a third embodiment.
  • a single recess 36 is formed on the sealing surface 30 in the present case.
  • the Recess 36 has a polygonal shape which is formed uniformly over the sealing surface 30 and mirror-symmetrically to the two central axes of the essentially circular stop element 26.
  • two fixing holes 32 and a fuel supply hole 33 are provided in the edge region of the stop element 26.
  • FIG. 5 shows a sectional view of the stop element 26 along the line V-V according to FIG. 4.
  • the recess 36 is made in the stop element 26 both on the upper, first sealing surface 30 and on the lower, second sealing surface 31.
  • the bushing 28 for the transmission body is located in the middle of the stop element 26.
  • the recess 36 has a predetermined axial depth h, which is at least 0.02 mm, in each sealing surface 30, 31.
  • Each recess 36 thus comprises non-load-bearing and therefore non-sealing surface areas 40, which are recessed in comparison to the sealing surfaces 30, 31, so that there is an axial height difference between each sealing surface 30, 31 and the surface region 40 of the recess 36.
  • FIGS. 4 to 6 shows a top view of a further embodiment of the stop element 26, in which four recesses 36 are formed in the edge region of the sealing surface 30.
  • the recesses 36 are arranged in the present case semi-circular and mirror-symmetrical to the two central axes of the disk-shaped stop element 26.
  • the shape of the recesses 36 according to FIGS. 4 to 6 is produced, for example, by embossing the stop element 26 on both sides.
  • FIG. 7 shows a sectional view of the stop element 26 along the line VII-VII according to FIG. 6.
  • the bushing 28 extends from the first sealing surface 30 through the stop element 26 to the second sealing surface 31.
  • the sealing surfaces 30, 31 are designed to be higher than the surface regions 40 of the recesses 36.

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)

Abstract

L'invention concerne un injecteur de carburant pour un moteur à combustion interne, présentant un corps d'injecteur (2), dans lequel une aiguille (10) comportant une butée (34) est placée de manière mobile, ainsi qu'un porte-injecteur (6), dans lequel un poussoir (16) est monté de manière mobile. Un élément de butée (26) en forme de rondelle est placé dans une zone comprise entre le corps d'injecteur (2) et le porte-injecteur (6). Le corps d'injecteur (2) et le porte-injecteur (6) sont serrés axialement l'un contre l'autre de sorte que l'élément de butée (26) forme une première surface d'étanchéité (30), qui prend appui sur une partie de porte-injecteur (23), et une deuxième surface d'étanchéité (31) qui prend appui sur une partie de corps d'injecteur (24). La première comme la deuxième surface d'étanchéité (30, 31) présentent respectivement au moins un évidement (36) qui est découpé, percé et/ou estampé.
EP02708204A 2001-02-06 2002-02-04 Procédé de fabrication d'un ELEMENT D'ETANCHEITE PLACE ENTRE DES ELEMENTS D'UN INJECTEUR DE CARBURANT DESTINE A UN MOTEUR A COMBUSTION INTERNE Expired - Lifetime EP1362181B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10105368A DE10105368A1 (de) 2001-02-06 2001-02-06 Kraftstoffeinspritzdüse für eine Brennkraftmaschine
DE10105368 2001-02-06
PCT/DE2002/000400 WO2002063159A1 (fr) 2001-02-06 2002-02-04 Element d'etancheite place entre des elements d'un injecteur de carburant destine a un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1362181A1 true EP1362181A1 (fr) 2003-11-19
EP1362181B1 EP1362181B1 (fr) 2005-04-20

Family

ID=7673051

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02708204A Expired - Lifetime EP1362181B1 (fr) 2001-02-06 2002-02-04 Procédé de fabrication d'un ELEMENT D'ETANCHEITE PLACE ENTRE DES ELEMENTS D'UN INJECTEUR DE CARBURANT DESTINE A UN MOTEUR A COMBUSTION INTERNE

Country Status (4)

Country Link
US (1) US7007869B2 (fr)
EP (1) EP1362181B1 (fr)
DE (2) DE10105368A1 (fr)
WO (1) WO2002063159A1 (fr)

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DE10215980B4 (de) 2002-04-11 2008-03-27 Siemens Ag Leckageanschluss für einen Kraftstoffinjektor
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US7509948B1 (en) 2007-10-01 2009-03-31 Caterpillar Inc. Variable displacement pump with an anti-stiction device
DE102008007225A1 (de) * 2008-02-01 2009-08-06 Robert Bosch Gmbh Zwischenplatte für einen Kraftstoffinjektor sowie Kraftstoffinjektor
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Also Published As

Publication number Publication date
US20040021012A1 (en) 2004-02-05
US7007869B2 (en) 2006-03-07
EP1362181B1 (fr) 2005-04-20
WO2002063159A1 (fr) 2002-08-15
DE10105368A1 (de) 2002-08-29
DE50202841D1 (de) 2005-05-25

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