EP1601869A1 - Soupape comportant un element ressort, con ue pour un injecteur de carburant - Google Patents

Soupape comportant un element ressort, con ue pour un injecteur de carburant

Info

Publication number
EP1601869A1
EP1601869A1 EP04737280A EP04737280A EP1601869A1 EP 1601869 A1 EP1601869 A1 EP 1601869A1 EP 04737280 A EP04737280 A EP 04737280A EP 04737280 A EP04737280 A EP 04737280A EP 1601869 A1 EP1601869 A1 EP 1601869A1
Authority
EP
European Patent Office
Prior art keywords
valve
spring element
valve body
bore
valve according
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
EP04737280A
Other languages
German (de)
English (en)
Other versions
EP1601869B1 (fr
Inventor
Jürgen Dick
Heinz Lixl
Johann Massinger
Martin Simmet
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP1601869A1 publication Critical patent/EP1601869A1/fr
Application granted granted Critical
Publication of EP1601869B1 publication Critical patent/EP1601869B1/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
    • 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
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps

Definitions

  • the invention relates to a valve of a fuel injector with a valve housing with a sealing seat for a valve body, with a spring element that prestresses the valve body in a closed position on the sealing seat.
  • valve If the valve is opened, the fuel pressure acting on the nozzle needle from the control chamber decreases, while the pressure in the nozzle chamber remains the same, so that the nozzle needle nem sealing seat and fuel is injected from the nozzle chamber through the injection holes into the combustion chamber of the internal combustion engine.
  • the valve has a closing member which is biased by a spring against a sealing view. The spring is located in the control room, ie on the high pressure side.
  • the object of the invention is to create a simplified structural design of such a valve, in order thereby to simplify handling during assembly while at the same time reducing the size of the valve.
  • the downstream side of the valve is far more accessible for the assembly of the spring element acting on the valve body than the high pressure side and, as a result, offers favorable prerequisites for efficient assembly.
  • the design of the valve can be simplified as well as downsized. Through the direct attachment of the spring element on the valve plate, an improved reaction speed of the valve can be achieved. Likewise, the spring element can be installed in the relaxed state and adapted to the spatial conditions.
  • the spring element is clamped between the valve housing and the valve cone.
  • valve according to the invention is cheaper to manufacture. This also enables the valve to respond more quickly, since no further lifting or pushing element is required, as in the prior art.
  • Another embodiment of the invention has a latching surface on the side, expediently on both sides of the bore of the spring element engaging in the groove of the valve body, in order to give the spring element a reliable fit in the groove and to preclude lateral displacement of the plate spring out of the groove.
  • the individual components of the plug valve do not need to be disassembled in order to install and tension the spring element.
  • the insertion opening can be adapted to different valve body diameters.
  • the spring element is unable to leave the engaged position horizontally or vertically in the upstream direction of the valve.
  • a modified embodiment for the support surface of the valve body consists in that the support surface is arranged on a ring fastened on the head of the valve body.
  • the ring can be non-positively mounted on the valve body after the spring element has been pushed onto the head beforehand by the head being passed through the bore of the spring element.
  • the flow opening for the fuel can now be closed by the valve body in a force-locking and positive-locking manner with respect to the valve plate, so that no additional sealing elements are required and a direct and direct opening or closing of the passage is possible with the aid of the valve body. Indirect sealing via a hydraulic system is not necessary.
  • a groove or groove is expediently arranged as a flow opening for the fuel.
  • Fig. 2 shows a section along line A-A in Fig.l
  • Fig. 3 shows a section along line B-B in Fig. 1 in an enlarged view
  • FIG. 5 shows the spring element according to FIG. 4 in a side view
  • Figure 6 shows the assembly of the spring element in plan view.
  • Fig. 7 is a section along line A-A in Fig. 6;
  • Fig. 9 is a section along line A-A in Fig. 8;
  • FIGS. 1 to 12 shows a further embodiment of the spring element in side view and top view
  • 13 shows an injection valve with a servo valve into which a spring element according to FIGS. 1 to 12 can be inserted.
  • FIG. 1 shows a top view of a valve plate 3 which has a recess 8.
  • a recessed, second recess 26 is made, into which a spring element 12 is inserted.
  • the spring element has an elongated rounded shape and is made of a thin sheet.
  • the second recess 26 has a shape that essentially corresponds to the width of the spring element 12, but is longer than the spring element 12.
  • the spring element 12 is shown in Fig. 1 in the assembled state.
  • a valve body 5 is arranged in the middle of the spring element 12 and is positively connected to the spring element 12.
  • a valve head 6 protrudes through a central bore 14 of the spring element 12.
  • the valve head 6 has a circular cross section, the diameter of which in the end region is larger than the diameter of the central bore 14.
  • the central bore 14 merges into two outer bores 13.
  • the outer bores 13 have a partial circular shape, the diameter of which is greater than. the diameter of the valve head 6.
  • a surface 9 of the valve plate 3 is designed as a flat surface.
  • the recess 8 essentially has a circular cross section.
  • Fig. 2 shows the valve plate 3 in cross section AA of the figure.
  • the valve plate 3 has a valve bore 4 which opens into the second recess 26. In the direction of the second recess 26, the valve bore 4 tapers via a conically tapering valve seat 7.
  • a valve body 5 is introduced into the valve bore 4, which is designed to taper conically via a sealing surface 27 to a groove 10.
  • the groove 10 delimits a cylindrical section of the valve body 5 which merges into the valve head 6 via the groove 10.
  • the valve head 6 has a larger diameter than the valve body 5 in the region of the groove 10.
  • the spring element 12 bears with circular segment-shaped edge regions of the central bore 14 on opposite sides of the groove 10.
  • the spring element 12 is positively connected to the valve body 5 in the direction perpendicular to the longitudinal direction of the valve body 5 by the circular segment-shaped edge regions. In addition, a displacement of the spring element 12 in the longitudinal direction of the valve body 5 is not possible due to the wider valve head 6.
  • the cross-section of the spring element 12 has a shape that is curved in the center region, which, with two end regions, which are arranged in the region of the outer bores 13, rest on the valve plate 3 in the second recess 26.
  • a central region of the spring element 12, in which the central bore 14 is arranged, is raised from a base area of the second recess 26 and bears against the valve head 6.
  • the valve body 5 is pressed against the valve seat 7 of the valve plate 3 by the deflection of the spring element 12 with the sealing surface 27. In this way, the valve bore 4 is sealed in a flow direction 2, which leads from the bottom to the top.
  • the valve body 5 has a smaller cross section in the valve bore 4 than the valve bore 4, so that fuel can flow from below to the valve seat 7.
  • valve body 5 To open the valve bore 4, it is necessary for the valve body 5 to be pressed against the biasing force of the spring element 12 from top to bottom, so that the sealing surface 27 of the valve body 5 lifts off the valve seat 7. This creates an opening in the Valve bore 4 is released so that fuel can flow upwards through the valve plate 3 from below.
  • FIG. 3 shows a cross section B-B through FIG. 1. It can clearly be seen that the spring element 12 lies directly against the valve head 6 in the region of the central bore 14. In the area of the groove 10, the valve body 5 has a smaller diameter than in the area of the valve head 6.
  • the central bore 14 has identical, identical circular segments 28 as edge regions, the diameter of which essentially corresponds to the diameter of the valve body 5 in the region of the groove 10.
  • the middle bore 14 is connected to the outer two bores 13 via intermediate regions 29.
  • the spring element 12 has partial rings 30 with which the spring element 12 rests on the valve plate 3 in the installed state.
  • the diameter of the outer bores 13 is larger than the diameter of the central bore 14 and at the same time larger than. the diameter of the valve head 6. This allows the valve head 6 to be pushed through an outer bore 13 during assembly of the spring element 12 and then a positive connection of the spring element 12 to the valve body 5 can be achieved by laterally displacing the spring element 12 relative to the valve body 5.
  • the intermediate region 29 of the spring element 12 is temporarily widened by the valve body 5 in the region of the groove 10 until the valve body 5 reaches the central bore 14.
  • the spring element 12 is made of an elastic material, preferably spring steel, so that the spring derelement 12 in the area of the intermediate areas 29 after the valve body 5 is pushed back to the original shape.
  • FIG. 5 shows the spring element 12 in a side view, in which the curved shape of the spring element 12 with a central curvature 31 can be clearly seen.
  • the central curvature 31 is essentially formed in the region of the central bore 14
  • valve body 5 shows the position of the spring element 12 during assembly and fastening with the valve body 5.
  • the spring element 12 is arranged to the far right in the second recess 26. Subsequently, the valve body 5 with the valve head 6 is inserted from below through the valve bore 4 and the valve head 6 is pushed through the left, outer bore 13.
  • FIG. 10 shows an enlarged illustration of the second valve according to FIG. 9.
  • the recess 8 shows a further embodiment of a valve in a plan view from the side of the recess 8.
  • the recess 8 has a third recess 20 instead of the second recess 26, which is essentially cylindrical with two part-circular extension sections 32 is trained.
  • the third recess 20 is arranged under a further spring element 19.
  • the further spring element 19 is designed in the form of a circular disk with a central bore.
  • Fig. 9 shows the second valve of Figure 8 in section A-A.
  • the further spring element 19 is fastened to the valve head 6 of the valve body 5 via a clamping ring 21.
  • the clamping ring 21 replaces the groove 10 and the widened version of the valve head according to the previous figures.
  • the further spring element 19 essentially has a circular disk shape with a central bore.
  • the valve head 6 is guided through the central bore.
  • the further spring element 19 also has a curved shape, the further spring element 19 having an arc shape in cross section.
  • Valve body 5 with its sealing surface 27 on the valve seat 7 of the valve plate 3.
  • the further spring element 19 is pushed onto the valve head 6 until the further spring element 19 rests in the edge area on the valve plate 3.
  • the further spring element 19 is pressed via a clamping ring 21 in the direction of the valve plate 3.
  • the clamping ring 21 is poisoned with the valve head 6, so that the further spring element 19 is positively connected to the valve body 5.
  • the further spring element 19 is prestressed against the valve plate 3, so that the valve body 5 is pulled against the valve seat 7 of the valve plate 3 by the pretensioning of the further spring element 19.
  • FIG. 11 shows a third spring element 33, which is designed in the form of a circular disk in the base area, but which has a central, circular curvature 34.
  • the cross-section of the curvature 34 along a cross-sectional line 37 is symmetrical to a central axis M and essentially corresponds to the cross-section of the spring element 12, as shown in FIG. 5.
  • the third spring element 33 is curved upward in the edge region.
  • the third spring element 33 has a central bore 14 which is connected to outer bores 13 via intermediate regions 29 according to the spring element 12 ' .
  • the third spring element 33 shows a combination of the circular disk shape with the central bore 14 and the outer bores 13.
  • FIG. 13 schematically shows an injection valve with a 2/2-way valve which is used as a servo valve and is designed in accordance with the shapes described in FIGS. 1 to 12.
  • fuel at a high pressure is fed from a high-pressure accumulator, which is not shown, via a high-pressure bore 41 and an inlet bore 42 with an inlet throttle 43 to a control chamber 44 in an injection valve body 45.
  • the fuel pressure then acts on a rear end of an axially movable nozzle needle 46.
  • a movement of the nozzle needle 46 opens and closes injection holes 47 which are formed in the injection valve body 45 and which lead to a combustion chamber of an internal combustion engine.
  • the injection holes 47 are connected to a nozzle chamber 48 when the injection valve is open.
  • the nozzle chamber 48 is at the front end of the nozzle needle
  • nozzle needle 46 formed in the injector body 45 and connected to the high pressure bore 41. If the full fuel pressure is present at the nozzle needle 46 both in the control chamber 44 and in the nozzle chamber 48, the nozzle needle 46 is pressed downward due to the larger effective area in the control chamber 44 and thereby closes the injection holes 47.
  • From the control chamber 44 leads a connecting bore 51 in the injection valve body 45 with an outlet throttle 60 to a servo valve 49 integrated in the injection valve body 45, which in turn is connected to a fuel tank via an unpressurized fuel return 59.
  • the servo valve is actuated and actuated by an electromagnetic or piezoelectric actuator 68 via a valve tappet 56.
  • the servo valve 49 has the task of controlling the pressure that is exerted on the movable nozzle needle 46 in the control chamber 44 for closing and opening the injection valve. If the servo valve 49 is closed, the full fuel pressure is essentially present in the control chamber 44, so that the nozzle needle 46 closes the injection holes 47 which lead into the combustion chamber of the internal combustion engine. If the actuator 58 is controlled electrically, the valve tappet 56 exerts a force on the servo valve 49 pressurized with a spring element 12, 19, 33, 35. As a result, the servo valve 49 opens, so that a connection is established between the high pressure accumulator, the control chamber 44, the servo valve 49 and the fuel return 64.
  • the resulting fuel flow via the servo valve 49 leads to a defined pressure drop in the inlet throttle 43 and the outlet throttle 60.
  • Control chamber 44 As a result, the fuel pressure acting on the nozzle needle 46 in the control chamber 44 decreases, while the pressure in the nozzle chamber 48 remains the same, so that the nozzle needle 46 rises and fuel from the nozzle chamber 48 via the injection holes 47 into the combustion chamber Injecting internal combustion engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne une soupape conçue pour un injecteur de carburant, comprenant un logement de soupape, un corps de soupape pourvu d'un siège étanche, ainsi qu'un élément ressort qui précontraint le corps de soupape sur le siège étanche en position de fermeture. A cet effet, l'élément ressort est disposé en aval du siège étanche.
EP04737280A 2003-03-04 2004-02-25 Soupape comportant un element ressort pour un injecteur de carburant Expired - Lifetime EP1601869B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10309310 2003-03-04
DE10309310 2003-03-04
PCT/EP2004/001880 WO2004079180A1 (fr) 2003-03-04 2004-02-25 Soupape comportant un element ressort, conçue pour un injecteur de carburant

Publications (2)

Publication Number Publication Date
EP1601869A1 true EP1601869A1 (fr) 2005-12-07
EP1601869B1 EP1601869B1 (fr) 2007-11-14

Family

ID=32945825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04737280A Expired - Lifetime EP1601869B1 (fr) 2003-03-04 2004-02-25 Soupape comportant un element ressort pour un injecteur de carburant

Country Status (3)

Country Link
EP (1) EP1601869B1 (fr)
DE (1) DE502004005498D1 (fr)
WO (1) WO2004079180A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7033835B1 (en) 1988-02-26 2006-04-25 Large Scale Biology Corporation Production of peptides in plants as viral coat protein fusions
DE102005024871A1 (de) * 2005-05-31 2006-12-07 Siemens Ag Injektor, insbesondere Kraftstoffinjektor
DE102005026979B4 (de) * 2005-06-10 2009-11-12 Siemens Ag Kraftstoffinjektor mit einer steuerbaren Ablaufdrossel einer Servoventil-Einheit zur Steuerung einer Düsennadel
DE102005032086B4 (de) * 2005-07-08 2014-03-27 Continental Automotive Gmbh Schaltventilvorrichtung und Einspritzventil
GB201314826D0 (en) * 2013-08-20 2013-10-02 Delphi Tech Holding Sarl Control Valve Arrangement
WO2017001094A1 (fr) * 2015-07-02 2017-01-05 Robert Bosch Gmbh Injecteur de carburant

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3888468T2 (de) * 1987-12-02 1994-09-29 Ganser Hydromag Elektronisch gesteuertes Brennstoffeinspritzventil.
DE19816316A1 (de) * 1998-04-11 1999-10-14 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
DE19820341C2 (de) * 1998-05-07 2000-04-06 Daimler Chrysler Ag Betätigungsvorrichtung für eine Hochdruck-Einspritzdüse für flüssige Einspritzmedien

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004079180A1 *

Also Published As

Publication number Publication date
WO2004079180A1 (fr) 2004-09-16
EP1601869B1 (fr) 2007-11-14
DE502004005498D1 (de) 2007-12-27

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