WO2004061290A1 - Soupape de commande pour injecteurs, en particulier pour injecteurs a rampe commune de moteurs a combustion interne - Google Patents

Soupape de commande pour injecteurs, en particulier pour injecteurs a rampe commune de moteurs a combustion interne Download PDF

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Publication number
WO2004061290A1
WO2004061290A1 PCT/DE2003/002143 DE0302143W WO2004061290A1 WO 2004061290 A1 WO2004061290 A1 WO 2004061290A1 DE 0302143 W DE0302143 W DE 0302143W WO 2004061290 A1 WO2004061290 A1 WO 2004061290A1
Authority
WO
WIPO (PCT)
Prior art keywords
control valve
control
injectors
valve piston
valve
Prior art date
Application number
PCT/DE2003/002143
Other languages
German (de)
English (en)
Inventor
Wolfgang Schmiderer
Michael Rainer Schmid
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 WO2004061290A1 publication Critical patent/WO2004061290A1/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
    • 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 control valve for injectors, in particular for common rail injectors of internal combustion engines, which is arranged as a metering device for a high-pressure liquid, primarily fuel, in an injector body having a high-pressure liquid inlet, with a valve seat, in particular Solenoid valve seat, forming valve body, which has a control valve piston receiving and with the valve seat through an Neritatisbohrung hydraulically connected to an outlet throttle axial recess, at the control bore-side (upper) end a control chamber is formed; into which an inlet throttle hydraulically connected to the high-pressure liquid inlet opens laterally, the control valve piston interacting hydraulically with the connecting bore at its outlet throttle-side (upper) end.
  • Control valves of the aforementioned type are used in particular in so-called common rail injectors, that is to say in fuel injection systems of internal combustion engines.
  • the injector body is hydraulically connected to a central high-pressure accumulator (so-called common rail).
  • a nozzle needle In a multi-graded axial recess passing through the injector body, a nozzle needle, with its upper part at the same time forming the valve piston of the control valve, is axially movable and controls the fuel injection quantity emerging through the injection nozzle as a function of the pressure in the control chamber of the control valve body.
  • the control valve is usually a solenoid valve.
  • valve piston In the known control valves of the type in question, generally so-called 2/2-way valves, the valve piston has a flat end face at its (upper) end facing the control valve seat.
  • the valve piston in the valve body moves upwards. This causes the valve piston to throttle at the connection hole to the outlet throttle. This results in pressure vibrations in the pumped, high-pressure liquid (fuel), which lead to strong valve piston vibrations. This results (undesirably) in a wavy quantity map.
  • the object of the invention is to reduce the ripple in the quantity map by reducing the valve piston vibrations.
  • the object is achieved in a control valve of the type described in the introduction in that the outlet throttle-side (upper) end of the control piston is designed to be uneven on the end face, in such a way that it runs symmetrically towards a maximum point associated with the central axis of the control valve piston.
  • the outlet throttle-side (upper) end of the control valve piston preferably has a spherically curved end face.
  • the spherical valve piston end face should be spherically curved.
  • a radius of curvature of 18 mm or essentially 18 mm has proven to be advantageous.
  • the spherical (or obtuse / conical) design of the control valve piston end creates an approximately wedge-shaped “pinch gap” between the valve piston end and the flat surface of the valve body (valve body bottom) surrounding the connection bore to the outlet throttle, which dampens the throttling to the connection bore of the outlet throttle and thereby the valve piston vibrations reduced.
  • valve body base can be dispensed with entirely. Because the spherical (or obtuse-angled / conical) valve piston end will not "stick” hydraulically even with a slightly concave valve body base. This also results in a cost saving potential for valve body production.
  • Fig. 2 shows the upper end of the control valve piston in an enlarged view compared to FIG. 1.
  • valve body 10 a valve body of a control valve, e.g. Solenoid valve.
  • the valve body 10 is arranged in a known and therefore not shown manner in the housing body of a CR injector.
  • a conical control valve seat 12 is formed which interacts with a valve ball (not shown) which can be actuated in the usual way by an electromagnet (not shown).
  • valve body 10 has a.
  • a control chamber 15 At the upper end of the axial bore 13, forming a control chamber 15, there is - axially - a connecting bore 16 which merges into a discharge throttle 17.
  • the control chamber 15 is thus hydraulically connected to the conical control valve seat via the connection bore 16 and the discharge throttle 17.
  • Axial bore 13 forms a flat surface 19 surrounding the connecting bore 16, the valve body base.

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)
  • Magnetically Actuated Valves (AREA)

Abstract

L'invention concerne une soupape de commande pour injecteurs, en particulier pour injecteurs à rampe commune de moteurs à combustion interne. Cette soupape de commande sert d'unité de dosage d'un liquide haute pression, en particulier de carburant, et est montée dans un corps d'injecteur présentant une arrivée de liquide haute pression. Cette soupape présente un corps (10), qui forme un siège de soupape (12), notamment un siège de soupape magnétique. Le corps de soupape (10) présente un évidement axial (13) recevant un piston de soupape de commande (14) et raccordé hydrauliquement au siège de soupape (12) par un orifice de raccordement (16) pour former un étranglement d'évacuation (17). Une chambre de commande (15) est formée à l'extrémité (19) (supérieure), côté orifice de commande, de l'évidement axial. Un étranglement d'arrivée (18), raccordé hydrauliquement à l'arrivée de liquide haute pression, débouche latéralement dans la chambre de commande (15). Le piston de soupape de commande (14) coopère hydrauliquement, à son extrémité (20) (supérieure), côté étranglement d'évacuation, avec l'orifice de raccordement (16). L'invention est caractérisée en ce que l'extrémité (20) (supérieure), côté étranglement d'évacuation, du piston de soupape de commande (14) n'est pas plane côté face, de sorte qu'elle tend de manière symétrique vers un point maximal (M) situé sur l'axe central (22) du piston de soupape de commande (14).
PCT/DE2003/002143 2002-12-20 2003-06-27 Soupape de commande pour injecteurs, en particulier pour injecteurs a rampe commune de moteurs a combustion interne WO2004061290A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10259950.5 2002-12-20
DE2002159950 DE10259950A1 (de) 2002-12-20 2002-12-20 Steuerventil für Injektoren, insbesondere Common-Rail-Injektoren von Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
WO2004061290A1 true WO2004061290A1 (fr) 2004-07-22

Family

ID=32404047

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/002143 WO2004061290A1 (fr) 2002-12-20 2003-06-27 Soupape de commande pour injecteurs, en particulier pour injecteurs a rampe commune de moteurs a combustion interne

Country Status (2)

Country Link
DE (1) DE10259950A1 (fr)
WO (1) WO2004061290A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008042293A1 (de) * 2008-09-23 2010-03-25 Robert Bosch Gmbh Injektor zur Einspritzung von mit Hochdruck beaufschlagtem Kraftstoff in den Brennraum einer Brennkraftmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5901941A (en) * 1995-07-14 1999-05-11 Elasis Sistema Ricerca Fiat Nel Mezzogiorno Societa Consortile Per Azioni Electromagnetic metering valve for a fuel injector
EP0916842A1 (fr) * 1997-11-18 1999-05-19 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Dispositif de commande d'un injecteur de combustible de moteurs à combustion interne
WO2001014722A1 (fr) * 1999-08-23 2001-03-01 Robert Bosch Gmbh Injecteur de structure compacte pour systeme d'injection a rampe commune de moteur a combustion interne
WO2002095217A1 (fr) * 2001-05-21 2002-11-28 Robert Bosch Gmbh Element d'etancheite haute pression pour injecteurs
WO2003054375A1 (fr) * 2001-12-07 2003-07-03 Robert Bosch Gmbh Dispositif d'injection de carburant pour moteur a combustion interne

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5901941A (en) * 1995-07-14 1999-05-11 Elasis Sistema Ricerca Fiat Nel Mezzogiorno Societa Consortile Per Azioni Electromagnetic metering valve for a fuel injector
EP0916842A1 (fr) * 1997-11-18 1999-05-19 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Dispositif de commande d'un injecteur de combustible de moteurs à combustion interne
WO2001014722A1 (fr) * 1999-08-23 2001-03-01 Robert Bosch Gmbh Injecteur de structure compacte pour systeme d'injection a rampe commune de moteur a combustion interne
WO2002095217A1 (fr) * 2001-05-21 2002-11-28 Robert Bosch Gmbh Element d'etancheite haute pression pour injecteurs
WO2003054375A1 (fr) * 2001-12-07 2003-07-03 Robert Bosch Gmbh Dispositif d'injection de carburant pour moteur a combustion interne

Also Published As

Publication number Publication date
DE10259950A1 (de) 2004-07-01

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