EP1278957A1 - Reglage de la course du pointeau d'injecteurs de systemes d'injection - Google Patents

Reglage de la course du pointeau d'injecteurs de systemes d'injection

Info

Publication number
EP1278957A1
EP1278957A1 EP01933623A EP01933623A EP1278957A1 EP 1278957 A1 EP1278957 A1 EP 1278957A1 EP 01933623 A EP01933623 A EP 01933623A EP 01933623 A EP01933623 A EP 01933623A EP 1278957 A1 EP1278957 A1 EP 1278957A1
Authority
EP
European Patent Office
Prior art keywords
nozzle needle
pressure
nozzle
injector
valve piston
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Withdrawn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
EP01933623A
Other languages
German (de)
English (en)
Inventor
Holger Rapp
Uwe Grytz
Thomas Sommer
Klaus Beier
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 EP1278957A1 publication Critical patent/EP1278957A1/fr
Withdrawn legal-status Critical Current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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/161—Means for adjusting injection-valve lift
    • 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

Definitions

  • the invention relates to a nozzle needle stroke setting on injectors of injection systems, such as those used in fuel injection systems with a high-pressure collection space (common rail).
  • a nozzle needle stroke setting on injectors of injection systems such as those used in fuel injection systems with a high-pressure collection space (common rail).
  • precise nozzle needle travel distances must be preset and adhered to during the operation of the injection system.
  • nozzle needle stroke settings are used, in which the needle stroke of the nozzle needle in the injector body is set by means of a cylindrically designed pressure piece.
  • the pressure piece which is designed with a widened head region, rests with an end face on an end face of a valve piston of the injector; the other end face of the cylindrical pressure piece rests on the upper side of the nozzle needle of the injector, wherein the pressure piece can be surrounded by a guide sleeve.
  • the thrust pieces used up to now are manufactured in dimensional groups.
  • the measurement groups are divided into 3 ⁇ m increments and are very Costly to manufacture and measure, since only the smallest tolerances are permitted, which increases the measuring effort not inconsiderably.
  • the pressure pieces In addition to costly production of the pressure pieces in dimensional groups, their use is associated with complex handling. For example, the pressure pieces have to be washed after their manufacture and classified according to size groups before they are sorted into individual batches. This means additional processing steps that can only be partially automated and require expensive measuring equipment.
  • the spherical design of the pressure body enables the valve piston force to be introduced exactly into the center of the nozzle needle.
  • the line of action of the pressure force on the top of the valve piston opposite Nozzle needle runs coaxially to the axis of symmetry of the nozzle needle.
  • a DLN ball manufactured in accordance with standards is used as the pressure body, the manufacturing costs of the injector can be significantly reduced by using a pressure body of this type.
  • the spherical pressure bodies used as DLN balls can be expected to reduce the unit costs and considerably reduce the storage costs, resulting overall in a more cost-effective production of the injector proposed according to the invention.
  • the spherical pressure bodies can also be used in diameter gradations in the ⁇ m range, so that there is a simple individual adaptation of the pressure body to be used to the specific application in each case.
  • Fig. 1 shows a two-part injector with a cylindrical pressure piece between the valve piston and nozzle needle face and 2 shows an injector body with a spherical pressure body provided between the valve piston end face and the nozzle needle surface.
  • the injector 1 shows an injector with a cylindrical pressure piece, which is arranged between the valve piston end face and the nozzle needle end face.
  • the injector 1 made of a material that is permanently resistant to high mechanical loads, consists of interconnected components, injector body 1.1 and nozzle body 1.2, which are screwed together by a nozzle clamping nut 3.
  • injector body 1.1 In a bore 5 in the injector body 1.1, an axial stroke-carrying valve piston 4 is received, which extends coaxially to the axis of symmetry of the injector body 1.1.
  • a bore 6 is made in the nozzle body 1.2, in which a nozzle needle 19 is received in an axially movable manner.
  • the two bore sections in the upper part 1.1 and in the nozzle needle part 1.2 of an inlet bore 16 for the fuel under high pressure, coming from the high-pressure collecting space, are connected to one another.
  • a precisely fitting connection between the injector body 1.1 and the nozzle body 1.2 is produced by two centering pins 10, one of which is shown in section in FIG. 1.
  • Each centering pin 10 engages on the one hand in a centering hole 11 which is formed in the injector body 1.1.
  • the other end of this centering pin 10, which bridges the parting line 13, is enclosed by a centering hole 12 which is made in the nozzle body 1.2.
  • the bore 5 in the upper part 1.1 of the injector body 1 a shim 7, surrounding the valve piston 4, against which a compression spring 14 received by the bore 5 in the upper part 1.1 of the injector body 1 bears.
  • the other end of the compression spring 14 rests on a shoulder of the cylindrical pressure piece 8.
  • the cylindrical pressure piece 8 is made in the configuration according to FIG. 1 as a bolt-shaped element, the tapered head area of which is enclosed by a few turns of the compression spring 14.
  • the valve piston 4 and the head of the cylindrically shaped pressure piece 8 come into contact with one another on a chamfered valve piston end face 15. Relative movements between the shaft of the cylindrical pressure piece 8 and that of the inside of the bore 5 in the injector body 1.1 lead to frictional wear between these two components.
  • the cylindrical pressure piece 8 lies against the top of the nozzle needle 19, which is enclosed by the bore 6 in the nozzle body 1.2.
  • the bore 6 in the nozzle needle part opens into a chamber 20, from which a nozzle needle bore 9 extends, which ends at the nozzle needle seat, not shown here.
  • FIG. 2 shows an injector with a spherical pressure body arranged between the nozzle needle surface and the end face of the valve piston.
  • the injector 1 as shown in FIG. 2 also consists of an injector body 1.1, which is detachably connected to a nozzle clamp nut 3 on a screw connection 2, the nozzle clamp nut 3 receiving a nozzle body 1.2.
  • the valve piston 4 according to FIG. 2 is designed in a longer axial extent.
  • the adjusting disc 7 in turn lies on the end face of the nozzle needle 19, on which a contact surface 18 can be formed to fix the spherically shaped pressure body 17.
  • the contact surface 18 can be manufactured, for example, by grinding the end face of the nozzle needle 19 in a conical or spherical manner.
  • the central positioning of the spherical pressure body 17 on the contact surface 18 of the nozzle needle 19 is accomplished by the concentricity of the axes of symmetry of the contact surfaces 18 and the nozzle needle 19 relative to one another.
  • FIG. 2 From the configuration according to FIG. 2 it can be seen, analogously to the illustration in FIG. 1, that the injector body 1.1 and the nozzle body 1.2 of the injector body resting on the parting line 13 are aligned with one another by means of two centering pins 10.
  • Each centering pin 10 is received on the one hand in a bore 11 of the injector body 1.1 and in a centering bore 12 in the nozzle body 1.2.
  • the bore 6 in the nozzle body 1.2 opens analogously to the illustration in FIG.
  • the spherical pressure body 17 is formed in two gradations 17.1 and 17.2.
  • the end face 15 of the valve piston 4 is in central contact with the smaller spherical pressure piece of the size gradation 17.1.
  • the spherical pressure body 17 of the size gradation 17.1 lies against the contact surface 18, which is formed on the end face of the nozzle needle 19.
  • the spherical pressure body of size graduation 17.1 is enclosed by an adjusting disk 7, against which the compression spring 14, which surrounds the valve piston 4, bears.
  • the nozzle needle 19 can be actuated by the valve piston 4 without lateral force, which ensures that the nozzle needle 19 does not tilt in its bore 6 formed in the nozzle body 1.2, which merges into the chamber 20.
  • only an extension of the valve piston 4 and an optional extension of the nozzle needle 19 are required.
  • a stroke adjustment of the nozzle needle 19 can take place by means of the diameter classification of the pressure body 17, the stroke stop being at the upper end of the valve piston, which is not shown in the drawing.

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 (1) permettant d'injecter du carburant sous haute pression dans la chambre de combustion d'un moteur à combustion interne et comprenant un piston à soupape (4) qui exécute un mouvement alternatif axial permettant de commander le pointeau (19). Un corps de pression (17), situé entre le piston à soupape (4) et le pointeau (19), a une forme sphérique et est entouré d'un disque de réglage (7).
EP01933623A 2000-04-25 2001-04-23 Reglage de la course du pointeau d'injecteurs de systemes d'injection Withdrawn EP1278957A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10020166 2000-04-25
DE10020166A DE10020166A1 (de) 2000-04-25 2000-04-25 Düsennadel-Hubeinstellung an Injektoren von Einspritzanlagen
PCT/DE2001/001539 WO2001081756A1 (fr) 2000-04-25 2001-04-23 Reglage de la course du pointeau d'injecteurs de systemes d'injection

Publications (1)

Publication Number Publication Date
EP1278957A1 true EP1278957A1 (fr) 2003-01-29

Family

ID=7639835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01933623A Withdrawn EP1278957A1 (fr) 2000-04-25 2001-04-23 Reglage de la course du pointeau d'injecteurs de systemes d'injection

Country Status (5)

Country Link
US (1) US20020134865A1 (fr)
EP (1) EP1278957A1 (fr)
JP (1) JP2003532004A (fr)
DE (1) DE10020166A1 (fr)
WO (1) WO2001081756A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10148861A1 (de) * 2001-10-04 2003-04-24 Bosch Gmbh Robert Injektor zum Einspritzen von Kraftstoff in die Brennkammer einer Brennkraftmaschine
DE10241462A1 (de) * 2002-09-06 2004-03-18 Robert Bosch Gmbh Injektor zur Einspritzung von Kraftstoff in Brennräume von Brennkraftmaschinen, insbesondere servoventilgesteuerter Common-Rail-Injektor
EP1500810A1 (fr) * 2004-01-29 2005-01-26 Siemens VDO Automotive S.p.A. Unité d'actionnement
CN102330627A (zh) * 2011-10-16 2012-01-25 中国兵器工业集团第七0研究所 一种用于水平双对置柴油机的共轨喷油器喷油嘴
DE102017209836A1 (de) * 2017-06-12 2018-12-13 Hyundai Motor Company Kraftstoffeinspritzsystem, Kraftstoffeinspritzverfahren sowie Automobil

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT232490Y1 (it) * 1994-07-01 2000-01-10 Elasis Sistema Ricerca Fiat Dispositivo di registrazione della corsa dell'otturatore per un iniettore di combustibile
DE19641824A1 (de) * 1996-10-10 1998-04-16 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0181756A1 *

Also Published As

Publication number Publication date
DE10020166A1 (de) 2001-10-31
WO2001081756A1 (fr) 2001-11-01
JP2003532004A (ja) 2003-10-28
US20020134865A1 (en) 2002-09-26

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