EP2156048A1 - Injecteur - Google Patents

Injecteur

Info

Publication number
EP2156048A1
EP2156048A1 EP08759584A EP08759584A EP2156048A1 EP 2156048 A1 EP2156048 A1 EP 2156048A1 EP 08759584 A EP08759584 A EP 08759584A EP 08759584 A EP08759584 A EP 08759584A EP 2156048 A1 EP2156048 A1 EP 2156048A1
Authority
EP
European Patent Office
Prior art keywords
injector
valve
valve element
control chamber
pressure
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Withdrawn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
EP08759584A
Other languages
German (de)
English (en)
Inventor
Bernhard Arnold
Thomas Sommer
Friedmar Dresig
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 EP2156048A1 publication Critical patent/EP2156048A1/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Withdrawn legal-status Critical Current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
    • 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
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • 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

Definitions

  • the invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine, in particular a common rail injector, according to the preamble of claim 1.
  • the known injector comprises a two-part valve element consisting of a control rod and a nozzle needle.
  • the control rod is longitudinally displaceable in an injector body (part of the injector). With its end face, the control rod delimits a control chamber arranged in a valve element accommodated in the injector body, which is supplied with high-pressure fuel from an annular space (high-pressure region) within the injector body with fuel under high pressure via an inlet throttle.
  • the invention is therefore based on the object to propose an injector with a simplified structure and preferably an increased pressure resistance.
  • the invention is based on the idea of not integrating the inlet throttle for supplying the control chamber with high-pressure fuel as in the prior art in a sleeve-shaped portion of a valve piece or in a valve fitting on the sleeve, but the inlet throttle directly in the one-piece or multi-part Provide valve element.
  • the concept of the invention makes it possible according to the subclaims to realize advantageously further developed injector.
  • due to the invention can be dispensed with a sleeve-shaped portion of the valve piece or a replacement this separate sleeve for receiving the inlet throttle.
  • the inlet throttle is preferably a throttle bore introduced radially into the valve body.
  • the throttle bore is associated with a radially outwardly widening recess in the valve element in order to equalize the flow through the inlet throttle.
  • control chamber is at least partially radially outwardly bounded directly by the injector body of the injector. It is therefore deliberately dispensed with a separate component to the radially outer boundary of the control chamber.
  • a sleeve-shaped section of a valve piece or a control chamber limiting in the prior art the valve piece fitting sleeve is omitted, whereby the injector body can be made narrower than in the prior art and possibly the compressive strength of the injector with the same or even smaller diameter can be increased.
  • the axial portion of the control chamber which is bounded radially outside of the injector, is only temporarily limited by the injector body or only occasionally, in particular when the valve element is closed, even exists, in particular because the axial section is completely occupied by the valve element when the valve element is open.
  • valve element which delimits the control chamber in the axial direction
  • the injector body that is to say on a housing part of the injector enclosing at least one pressure chamber and a valve element section.
  • the provision of a guide sleeve for axially displaceable guidance of the valve element is superfluous due to the development of the invention.
  • the circumferential gap between the valve element and the injector body simultaneously forms a sealing gap for sealing the control chamber in the direction of the injector tip.
  • the inlet throttle is hydraulically connected via a bore, preferably an axial bore, more preferably via a central axial bore in the valve element with the radially outwardly of the injector limited axial portion of the control chamber.
  • the bore is part of the control chamber, that is, of the fuel in it acts in closed in the direction of the low pressure region of the injector control chamber, a closing force on the valve element.
  • the diameter of this bore is advantageously chosen so that the expansion of the valve element in its guide section leads to a favorable gap formation of the circumferential gap in the valve element and injector body in terms of tightness and wear.
  • the flow cross sections of the outlet throttle and the inlet throttle are matched to one another in such a way that when the control valve is open, a net outflow of fuel (control quantity) from the control chamber into the low pressure region of the injector results.
  • the valve piece additionally has the function of a sealing seat for the control valve.
  • the control valve may be either a valve driven by means of an electromagnetic actuator or by means of a piezoelectric actuator.
  • the control valve is designed as a pressure balanced in the axial direction valve to reliably switch pressures above 2000 bar can.
  • valve member is supported in the axial direction of an inner annular shoulder of the injector against which it is preferably pressed by means of another Injektorbauteils.
  • a high-pressure supply channel via which the injector is under high pressure fuel, in particular from a high-pressure fuel storage (Rail) is supplied, in an annular space (part of the high-pressure region) opens, which is bounded radially outwardly from the injector body and penetrated by the valve element.
  • the inlet throttle introduced into the valve element connects this annular space hydraulically to the control chamber, so that a subsequent flow of high-pressure fuel into the control chamber is ensured.
  • the high-pressure supply channel supplying the annular space is the only high-pressure supply channel in the injector body, that is, the fuel flowing into the annular space can flow axially through the annular space to a nozzle hole arrangement of the injector.
  • the injector is without a low-pressure stage, so leak-free, formed.
  • the annular space into which the high-pressure supply channel of the injector discharges is sealed off from the control chamber via a guide gap between the valve element and the injector body.
  • FIG. 1 is a partial schematic representation of an injector.
  • Fig. 1 designed as a common rail injector injector 1 for injecting fuel into a combustion chamber, not shown, of an internal combustion engine is shown.
  • the injector 1 has a housing as an injector body 2 and an end nozzle body 3, which are braced against each other with a union nut, not shown in the usual way.
  • the nozzle body 3 passes through the nozzle retaining nut in the axial direction.
  • valve element 4 is received axially displaceable.
  • the valve element 4 has at its lower end in the drawing plane a tip 5 with a closing surface 6, with which it can be brought into tight contact with a formed within the nozzle body 3 valve seat 7.
  • valve element 2 When the valve element 2 rests against the valve seat 7, ie is in a closed position, the fuel outlet from a nozzle hole arrangement 8 is blocked. If, on the other hand, it is raised by the valve seat 7, fuel can flow from a pressure chamber 9 (high-pressure region) between the valve element 4 and the inside of the nozzle body 3 pass through and past the tip 5 to the nozzle hole arrangement 8, where they are sprayed into the combustion chamber substantially under high pressure (rail pressure).
  • a pressure chamber 9 high-pressure region
  • the injector 1, or the annular pressure chamber 9, which is formed between the outer circumference of the valve element 4 and the inner peripheral wall of a stepped bore 10 within the injector body 2 and within the nozzle body 3 is supplied with fuel under high pressure from a high-pressure fuel reservoir 11 (Rail) ,
  • the fuel flows from the high-pressure fuel accumulator 11 via a feed line 12, through a high-pressure connection formed integrally with the injector body 2, into a high-pressure supply passage 13 within the injector body 2 formed as an oblique bore.
  • the high-pressure supply passage 13 opens into a bulge 14 within the injector body 2
  • the high-pressure fuel accumulator 11 is supplied with fuel from a low-pressure reservoir 16 by a high-pressure pump 15 designed in particular as a radial piston pump.
  • a control quantity of fuel to be explained later flows from a low-pressure region 18 of the injector 1 to the reservoir 16 and is returned to the high-pressure circuit via the high-pressure pump 15.
  • an inlet throttle 19 is introduced into the valve element 4.
  • the inlet throttle 19 is formed in the embodiment shown as a radial bore.
  • the inlet throttle 19 is at least approximately conical in the direction of the inlet throttle.
  • high-pressure fuel from the pressure chamber 9 flows into an axial bore formed as a blind hole 21 within the valve element 4.
  • the axial bore 21 is arranged centrally within the valve element 4 and starts from an upper end face 22 of the valve element 4.
  • the axial bore 21 is part of a control chamber 23, which is connectable by means of a control valve 24, shown schematically with the low pressure region 18 of the injector 1.
  • the flow cross-sections of the inlet throttle 19 and the outlet throttle 32 are matched to one another such that when the control valve 24 is open, a net outflow of fuel from the control chamber 23 results. Since the control chamber 23 is bounded in the axial direction by the valve element 4, this results in a force acting in the opening direction on the valve element 4, whereby this lifts off from its valve seat 7 and the fuel flow from the pressure chamber 9 through the Nozzle hole arrangement 8 releases into the combustion chamber of the internal combustion engine.
  • valve 24 closes and the pressure (control pressure) increases rapidly in the control chamber 23 due to the inflowing through the inlet throttle 19, under high pressure fuel, whereby the closing direction in the Valve elements 4 acting forces predominate and the valve member 4 comes with its closing surface 6 in tight contact with the valve seat 7 on the nozzle body 3.
  • a closing spring 41 which is supported in the axial direction on an annular shoulder 42 within the injector body 2 and the other end on a retaining ring 43 held on the valve element 4, the closing movement of the valve element 4 is supported.
  • the axial bore 21 is part of the control chamber 23.
  • the axial bore 21 opens into an axial section 33 of the control chamber 23, which is delimited radially on the outside by the injector body 2.
  • this axial portion 33 is bounded by the upper end face 22 of the valve element 4 and by a lower end face 34 of an extending into a bore portion 35 within the injector body 2 end portion 36 formed as a throttle plate valve piece 31.
  • the valve element 36 In the open state of the valve element 4 is the valve element 36 on the lower end face 34 of the end portion 36 of the valve piece 31, which serves as a stop for limiting the opening movement of the valve element 4.
  • control chamber 23 In the open state of the valve element 4, that is, during the injection process, the control chamber 23 is thus substantially exclusively of the peripheral walls of the Axial bore 21 and a running in the opposite direction blind hole 37 in the valve member 31 is limited, since the axial portion 33 is completely occupied by the valve element 4.
  • the axial portion 33 of the control chamber 23 is in the drawing plane down, ie in the direction of the pressure chamber 9, sealed via a guide gap (circumferential gap) radially between a guide portion 39 of the valve element 4 and the bore portion 35 (guide portion) of the injector body 2.
  • the valve element is with its guide portion 39 axially displaceably guided directly from the injector body 2.

Landscapes

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

Abstract

L'invention concerne un injecteur (1) destiné à injecter du carburant dans une chambre de combustion d'un moteur à combustion interne, en particulier un injecteur à rampe commune (common rail), comprenant un élément soupape pouvant passer d'une position fermée à une position ouverte, libérant un flux de carburant dans la chambre de combustion, en fonction de la pression existant dans la chambre de commande (23), et une soupape de commande (24) pouvant influencer la pression dans la chambre de commande, qui est reliée de manière hydraulique à une partie haute pression de l'injecteur (1) par l'intermédiaire d'une bobine d'alimentation (19). Selon l'invention, la bobine d'alimentation est intégrée à l'élément soupape (4).
EP08759584A 2007-06-01 2008-05-14 Injecteur Withdrawn EP2156048A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710025615 DE102007025615A1 (de) 2007-06-01 2007-06-01 Injektor
PCT/EP2008/055901 WO2008145517A1 (fr) 2007-06-01 2008-05-14 Injecteur

Publications (1)

Publication Number Publication Date
EP2156048A1 true EP2156048A1 (fr) 2010-02-24

Family

ID=39790137

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08759584A Withdrawn EP2156048A1 (fr) 2007-06-01 2008-05-14 Injecteur

Country Status (5)

Country Link
EP (1) EP2156048A1 (fr)
CN (1) CN101680407A (fr)
BR (1) BRPI0810792A2 (fr)
DE (1) DE102007025615A1 (fr)
WO (1) WO2008145517A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT212432Z2 (it) * 1987-08-25 1989-07-04 Weber Srl Valvola di iniezione del combustibile a comando elettromagnetico per motori a ciclo diesel
DE19827267A1 (de) 1998-06-18 1999-12-23 Bosch Gmbh Robert Kraftstoff-Einspritzventil für Hochdruck-Einspritzung mit verbesserter Steuerung der Kraftstoffzufuhr
DE10031573A1 (de) * 2000-06-29 2002-01-17 Bosch Gmbh Robert Hochdruckfester Injektor zur Kraftstoffeinspritzung in Kompaktbauweise
US6616064B2 (en) * 2000-06-29 2003-09-09 Robert Bosch Gmbh Injector with a control face on the outlet side
AT500774B8 (de) * 2004-08-06 2007-02-15 Bosch Gmbh Robert Vorrichtung zum einspritzen von kraftstoff in den brennraum einer brennkraftmaschine
DE102004044107A1 (de) * 2004-09-13 2006-03-30 Siemens Ag Hubvorrichtung und Einspritzventil

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008145517A1 *

Also Published As

Publication number Publication date
DE102007025615A1 (de) 2008-12-04
CN101680407A (zh) 2010-03-24
BRPI0810792A2 (pt) 2014-10-29
WO2008145517A1 (fr) 2008-12-04

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