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WO2006042488A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

Info

Publication number
WO2006042488A1
WO2006042488A1 PCT/DE2004/002341 DE2004002341W WO2006042488A1 WO 2006042488 A1 WO2006042488 A1 WO 2006042488A1 DE 2004002341 W DE2004002341 W DE 2004002341W WO 2006042488 A1 WO2006042488 A1 WO 2006042488A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
ball
valve piece
fuel injector
seat
Prior art date
Application number
PCT/DE2004/002341
Other languages
German (de)
English (en)
Inventor
Axel Schnaufer
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 PCT/DE2004/002341 priority Critical patent/WO2006042488A1/fr
Publication of WO2006042488A1 publication Critical patent/WO2006042488A1/fr

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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0043—Two-way valves
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the invention relates to a fuel injector according to the preamble of claim 1.
  • Fuel injectors of the genus in modern art are preferably used in modern high-pressure injection systems (common rail systems).
  • Such fuel injectors comprise a valve piece arranged in an injector body with a nozzle opening which can be closed by means of a valve ball.
  • the valve ball is guided in a ball guide and is pressurized by a loaded by a compression spring armature.
  • armature stroke which has an adverse effect on the design of the injection quantity, can occur with these extremely heavily loaded fuel injectors.
  • the change in the armature stroke also undesirably changes the injection quantity of the injected fuel. Investigations have shown that this change in the armature stroke is due to wear or material removal between the armature and the ball guide or between the valve ball and the valve piece.
  • the valve piece of the fuel injector is subjected to high pressure from both inside and outside.
  • the invention is based on the recognition that while the valve seat of the valve ball is deformed in the vertical and radial directions and is forced as a result of this deformation in a rotary motion. This forced by the pressure load movement leads to the observed signs of wear, which prevent the supply of the most constant injection quantity.
  • the material wear can be significantly reduced by the fact that the rotary motion promoting the wear is largely reduced. This is achieved by means of the solution according to the invention essentially in that the radial component of the movement of the valve seat is significantly reduced.
  • valve seat is arranged substantially in a plane which is aligned with a plane containing the bearing surface of the valve seat.
  • the reduced wear can significantly increase the life of these highly loaded fuel injectors, which lowers the maintenance cost of vehicles equipped with them.
  • the proposed improvement is also possible without changing the outer geometry of the valve seat, so that complex and expensive adjustment work on the valve seat receiving injector omitted.
  • FIG. 2 shows the valve piece of a conventional fuel injector
  • FIG. 3 shows the valve piece of a fuel injector designed according to the invention
  • Figure 4 is a diagram showing the radial deformation of the valve seat in
  • FIG. 1 shows a part of a fuel injector 1 in a longitudinal section.
  • a fuel injector 1 is used in modern high-pressure injection systems (common rail systems) for the injection of fuel into the cylinder of an internal combustion engine.
  • the fuel injector 1 comprises an injector body 2 in which a valve piece 3 (FIG. 2, FIG. 3) is mounted.
  • the valve piece 3 has a concentric bore which is in operative connection with a valve ball 6.
  • the bore and the valve ball form a valve which, depending on the position of the valve ball 6, is open or closed.
  • the valve ball 6 rests in a ball seat and is guided in its movement by a ball guide 4, which is arranged in a concentric recess of the valve piece 3.
  • valve ball is acted upon by an armature 5 with pressure, which is applied by a compression spring 7, on the one hand on a plate 5 connected to the armature 5 and on the other hand on the Injector body 2 is supported.
  • the armature 5 is movable by appropriate control of an actuator (piezoelectric actuator or solenoid valve) against the force exerted by the compression spring 7 compressive force and thus enables the lifting of the valve ball 6 from its ball seat 10. After lifting the valve ball 6 from its ball seat 10 can fuel through the Pass hole in the valve piece 3.
  • FIG. 2 shows the valve piece 3 of a conventional fuel injector 1 partly in longitudinal section.
  • the valve member 3 is formed substantially sleeve-shaped and has a centrally disposed bore 13 with a stepped diameter.
  • the two end pieces of the valve piece 3 have a different outer diameter.
  • a step new is formed, which has a bearing surfaces eighth. With this bearing surface, the valve piece 3 rests on a shape-adapted step in the injector body (FIG. 1).
  • a recess is arranged, which is initially conical and then merges into a cylindrical region.
  • the conical area forms the ball seat 10 for the valve ball 6.
  • the cylindrical area 11 adjoins this ball seat 10.
  • FIG. 3 shows the valve piece 3 of a fuel injector designed according to the invention.
  • the outer geometry of this inventively designed valve piece 3 is consistent with that of the valve piece shown in Figure 2, known. In particular, as far as the outer contour and the position of the bearing surface 8 are concerned.
  • This offers the advantage that the inventively designed valve pieces are fully compatible with the already known valve pieces ( Figure 2) and can be installed without further adaptation work in a conventional fuel injector 1.
  • the resulting advantages in terms of storage and cost savings are obvious.
  • the valve piece 3 according to FIG. 3 again has a recess in its end piece with the larger diameter, which recess is composed of a region 12 with a conical surface and a region 11 with a cylindrical surface.
  • the area 12 also receives the ball seat 10 for the valve ball 6.
  • the ball seat 10 is substantially further away from the end face 14 of the valve piece and lies as close as possible to a plane which also comprises the bearing surface 8.
  • this is achieved in that the conical region 12 is displaced substantially deeper in the direction of the center of the valve piece 3.
  • a cylindrical region 11 which has a substantially greater height than in the known valve piece (FIG. 2), now adjoins the conical region 12.
  • valve piece has a plane which is parallel to the support surface 8 of the valve member 3, that is perpendicular to the plane, and marks the transition between the conical portion 12 and the cylindrical portion 11, a distance al from the support surface. 8
  • this distance is a2, where a> a2.
  • the distance a2 is less than 3 mm, in particular between 1.8 mm and 2.5 mm.
  • said plane E lies approximately at half the height of the step 9 bearing the support surface 8.
  • valve piece according to Figure 3 is characterized by a much better deformation behavior and thus by improved stability. This leads to less material wear and thus to a longer service life. With the inventively designed valve pieces equipped fuel in vectors 1 show a longer life under causes even lower maintenance costs in the operation of a motor vehicle equipped with it.
  • FIG. Figure 4 shows a diagram showing the radial deformation of the ball seat 10 as a function of the position of the ball seat 10 with respect to the support surface 8.
  • distance values are entered in mm for the ball seat 10 on the support surface 8.
  • Y-axis of the graph he is the radial deformation of the ball seat 10 in microns plotted.
  • two measuring points 20 and 30 are entered in the diagram.
  • the measuring point 20 was determined in a conventional valve piece according to FIG. In this valve piece, the ball seat 10 was about 1.5 mm above the support surface 8. When loaded, the valve piece 3 results in a radial deformation of the ball seat between 0.3 and 0.4. microns.
  • the measuring point 30 was determined by measurements on the inventively designed valve piece 3 according to FIG.
  • the ball seat 10 is arranged in a plane which is only slightly removed from the plane containing the support surface 8. The distance is only about 0.5 mm.
  • the inventive solution leads to a significantly improved stability of the valve piece 3.
  • deformation values can still be achieved in the radial direction, which are less than about 0.1 microns.

Landscapes

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

Abstract

L'invention concerne un injecteur de carburant(1) comprenant un corps d'injecteur (2) et une pièce de soupape (3) logée dans ledit corps d'injecteur (2), qui repose, par une surface d'appui (9), sur un siège du corps d'injecteur (2), ainsi qu'une bille de soupape (6) logée mobile dans un guide de bille et sollicitée en pression par un induit (2) commandé par ressort. Ladite bille de soupape coopère avec un alésage (13) aménagé dans la pièce de soupape (3) et forme, conjointement avec cet alésage (13), une soupape à bille. Le siège sphérique (10) de la bille de soupape (6) est disposé dans la pièce de soupape (3), de sorte que la déformation radiale de la pièce de soupape (3), lors d'un mouvement de fermeture de la bille de soupape (6), adopte une valeur minimale.
PCT/DE2004/002341 2004-10-21 2004-10-21 Injecteur de carburant WO2006042488A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/DE2004/002341 WO2006042488A1 (fr) 2004-10-21 2004-10-21 Injecteur de carburant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2004/002341 WO2006042488A1 (fr) 2004-10-21 2004-10-21 Injecteur de carburant

Publications (1)

Publication Number Publication Date
WO2006042488A1 true WO2006042488A1 (fr) 2006-04-27

Family

ID=34959781

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2004/002341 WO2006042488A1 (fr) 2004-10-21 2004-10-21 Injecteur de carburant

Country Status (1)

Country Link
WO (1) WO2006042488A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0753658A1 (fr) * 1995-07-14 1997-01-15 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Soupape électromagnétique améliorée de dosage d'un injecteur de combustible
EP0851115A1 (fr) * 1996-12-23 1998-07-01 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Soupape électromagnétique de dosage à obturateur sphérique pour injecteur de combustible
EP1043497A2 (fr) * 1999-04-07 2000-10-11 Delphi Technologies, Inc. Soupape de commande
WO2002095217A1 (fr) * 2001-05-21 2002-11-28 Robert Bosch Gmbh Element d'etancheite haute pression pour injecteurs

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0753658A1 (fr) * 1995-07-14 1997-01-15 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Soupape électromagnétique améliorée de dosage d'un injecteur de combustible
EP0851115A1 (fr) * 1996-12-23 1998-07-01 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Soupape électromagnétique de dosage à obturateur sphérique pour injecteur de combustible
EP1043497A2 (fr) * 1999-04-07 2000-10-11 Delphi Technologies, Inc. Soupape de commande
WO2002095217A1 (fr) * 2001-05-21 2002-11-28 Robert Bosch Gmbh Element d'etancheite haute pression pour injecteurs

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